US-20260126126-A1 - Solenoid Valve

US20260126126A1US 20260126126 A1US20260126126 A1US 20260126126A1US-20260126126-A1

Abstract

A solenoid valve, including: a housing assembly, an installation cavity being provided in the housing assembly; wherein the housing assembly has a first flow port, a second flow port, and a main valve port located between the first flow port and the second flow port; and an on-off assembly, movably provided in the installation cavity; wherein the on-off assembly is used for controlling opening or closing of the main valve port, so as to realize connection and disconnection between the first flow port and the second flow port. The solenoid valve is in communication with the first flow port by providing the installation cavity, thereby avoiding a problem of a relatively large pressure difference between the first flow port or the second flow port with respect to the installation cavity inside the solenoid valve.

Inventors

Mo YIN
Fugang WANG
Yong Jin

Assignees

ZHEJIANG DUNAN ARTIFICIAL ENVIRONMENT CO., LTD.

Dates

Publication Date: 20260507
Application Date: 20251219
Priority Date: 20230619

Claims (20)

1 . A solenoid valve, comprising: a housing assembly, an installation cavity being provided in the housing assembly; wherein the housing assembly has a first flow port, a second flow port, and a main valve port located between the first flow port and the second flow port; an on-off assembly, movably provided in the installation cavity; wherein the on-off assembly is used for controlling opening or closing of the main valve port, so as to realize connection and disconnection between the first flow port and the second flow port; an upper iron core, movably provided in the installation cavity; a lower iron core, movably provided in the installation cavity and located below the upper iron core; wherein the on-off assembly is located below the lower iron core; the on-off assembly has a through intermediate channel; an end of the intermediate channel is in communication with the first flow port, and an other end of the intermediate channel is a pilot valve port; and the lower iron core is used for controlling opening and closing of the pilot valve port, so as to control a pressure difference between an upper part and a lower part of the on-off assembly; and a lower push rod, movably provided in the installation cavity; wherein an end of the lower push rod is in abutting fit with the upper iron core, and an other end of the lower push rod is in abutting fit with the on-off assembly; and an elastic member and an upper push rod; wherein an end of the elastic member abuts against the housing assembly, an other end of the elastic member abuts against an end of the upper push rod, and an other end of the upper push rod abuts against the lower iron core; and a farthest distance between the lower iron core and the pilot valve port is an opening degree of the pilot valve port, and a maximum spacing between the upper iron core and the lower iron core is equal to the opening degree of the pilot valve port.
2 . The solenoid valve according to claim 1 , wherein the lower iron core is provided with a constraint channel, and an inner wall of the constraint channel is matched with the lower push rod, so as to constrain the lower push rod to a reciprocating linear motion in a vertical direction; the lower iron core is elastically arranged in the installation cavity by the elastic member and the upper push rod; a guide cavity extending axially is provided inside the upper iron core; and both at least a part of the elastic member and at least a part of the upper push rod are located in the guide cavity, and the upper push rod is in limiting fit with an inner wall of the guide cavity; or, the solenoid valve further comprises a rubber gasket, and the rubber gasket is provided between the upper iron core and an inner wall of the installation cavity, so as to buffer an impact of the upper iron core on the inner wall of the installation cavity.
3 . The solenoid valve according to claim 1 , wherein the housing assembly comprises a valve seat and a valve cover, wherein the first flow port, the second flow port and the main valve port are all provided on the valve seat; and an interior of the valve seat and an interior of the valve cover form at least a part of the installation cavity; wherein the valve cover is detachably connected to the valve seat by threads; and the valve seat has a force-receiving surface, and the force-receiving surface abuts against the valve cover; and a pressure generated by a threaded connection force between the valve cover and the valve seat on the force-receiving surface lies within a pressure range born by the force-receiving surface.
4 . The solenoid valve according to claim 3 , wherein an annular constraint groove is provided in a circumferential direction of a side wall of the valve cover; or an annular constraint groove is provided in a circumferential direction of a side wall of the valve seat; and the solenoid valve further comprises an annular sealing ring, wherein the annular sealing ring is provided in the annular constraint groove and is in limiting fit with the annular constraint groove, and the annular sealing ring is matched with an inner wall of the valve seat so as to seal the installation cavity; or, the valve seat is further provided with a positioning groove, the positioning groove surrounds a circumferential direction of the main valve port; and the solenoid valve further comprises a buffer spring, an end of the buffer spring is arranged in the positioning groove and is in limiting fit with the positioning groove, and an other end of the buffer spring abuts against the on-off assembly so as to buffer an impact of the on-off assembly on the valve seat.
5 . The solenoid valve according to claim 3 , wherein the solenoid valve further comprises an installation seat, wherein the installation seat is detachably connected to the valve seat by threads; a valve seat cavity is provided inside the valve seat, and the first flow port, the second flow port and the main valve port are respectively in communication with the valve seat cavity; a cavity, and a first flow channel and a second flow channel which are respectively in communication with the cavity are provided inside the installation seat; a threaded mating section is provided in a middle of the valve seat, and the threaded mating section is in threaded connection with an inner wall of the cavity; a limiting surface is provided inside the cavity, and the limiting surface abuts against the valve seat to axially limit the valve seat; and the first flow channel is in communication with the second flow port, and the second flow channel is in communication with the first flow port.
6 . The solenoid valve according to claim 1 , wherein the housing assembly comprises a sleeve and a valve cover, and interiors of the sleeve and the valve cover form at least a part of the installation cavity; wherein an end of the sleeve is fixed on the valve cover by laser welding.
7 . The solenoid valve according to claim 6 , wherein a part of the sleeve connected to the valve cover is of a flared structure, the flared structure comprises a frustoconical curved section and a straight section connected to each other, an opening size of an end of the frustoconical curved section towards the main valve port is greater than an opening size of an end of the frustoconical curved section away from the main valve port, and the straight section is connected to the end of the frustoconical curved section having a larger opening size; an inner wall of the valve cover is provided with a frustoconical mating section, and a frustoconical curved surface on the frustoconical curved section is in abutting fit with a frustoconical fit surface of the frustoconical mating section; and the straight section and the valve cover are welded in a laser penetration welding manner.
8 . The solenoid valve according to claim 1 , wherein the solenoid valve further comprises an elastic gasket, an end of the lower iron core close to the upper push rod is provided with a constraint groove, at least a part of the elastic gasket is arranged in the constraint groove and is in limiting fit with the constraint groove; and a minimum axial size of the elastic gasket is not greater than an axial size of the constraint groove, such that the upper iron core and the lower iron core can be attached together.
9 . The solenoid valve according to claim 8 , wherein the elastic gasket is sleeved on a circumferential outer wall of the upper push rod; the elastic gasket is a disc spring; and the disc spring is made of a metal material.
10 . The solenoid valve according to claim 1 , wherein a guide cavity extending axially and a fit hole in communication with the guide cavity are provided inside the upper iron core; the upper push rod comprises a guide section and a mating section which are connected in sequence, wherein the guide section is arranged in the guide cavity and is in guide fit with an inner wall of the guide cavity; the elastic member is located in the guide cavity, an end of the elastic member abuts against the housing assembly, and an other end of the elastic member abuts against the guide section; a part of the mating section is located in the guide cavity, and an other part extends out of the fit hole and then abuts against the lower iron core; and a gap between the guide section and the inner wall of the guide cavity is smaller than a gap between the mating section and an inner wall of the fit hole.
11 . The solenoid valve according to claim 10 , wherein the housing assembly comprises a sleeve; an interior of the sleeve is used for accommodating at least a part of the upper iron core and at least a part of the lower iron core; a flow channel in communication with the guide cavity is further provided inside the upper iron core; the flow channel and the mating section are respectively located at two sides of the guide section; and the guide cavity of the upper iron core is in communication with a gap between the upper iron core and the sleeve through the flow channel.
12 . The solenoid valve according to claim 1 , wherein the on-off assembly comprises a piston body and a pilot valve block fixedly provided on the piston body; the pilot valve port is provided on the pilot valve block, and at least a part of the intermediate channel is provided in the piston body; the solenoid valve further comprises a check valve; the check valve is movably provided in the intermediate channel; and the pilot valve block is fixed on the piston body by welding.
13 . The solenoid valve according to claim 12 , wherein the pilot valve block is fixed on a top end face of the piston body by welding; or, a pilot valve groove is provided on a top end face of the piston body, and the pilot valve block is fixed in the pilot valve groove by welding and is in limiting fit with an inner wall of the pilot valve groove.
14 . The solenoid valve according to claim 12 , wherein the intermediate channel comprises a piston channel provided in the piston body and a guide channel provided in the pilot valve block; the check valve is located in the piston channel, the check valve blocks a lower opening of the guide channel, and an upper opening of the guide channel is the pilot valve port; and at least a part of the pilot valve block is located in the piston channel, and an outer wall of the pilot valve block and an inner wall of the piston channel are fixed by welding; or, the pilot valve block comprises an insertion section fitting the piston body and a pilot valve section internally provided with the pilot valve port, and a diameter of the insertion section is larger than a diameter of the pilot valve section.
15 . The solenoid valve according to claim 12 , wherein the intermediate channel comprises a piston channel provided in the piston body and a guide channel provided in the pilot valve block; the check valve is internally provided with a first flow section and a second flow section in communication with each other in sequence from bottom to top, a radial size of the first flow section is greater than a radial size of the second flow section, a side surface of the second flow section is provided with a through hole, and the through hole achieves communication between the second flow section and the piston channel; and a wall thickness of the first flow section is equal to a wall thickness of the second flow section.
16 . The solenoid valve according to claim 15 , wherein an inner wall of the piston channel is provided with a step surface, and the step surface is used for limiting an axial movement of the check valve; the check valve comprises, from bottom to top, a first cylindrical portion, a second cylindrical portion and a frustoconical portion which are sequentially connected, in which the first flow section is located inside the first cylindrical portion, the second flow section is located inside the second cylindrical portion; the through hole passes through the second cylindrical portion; the first cylindrical portion can be in abutting fit with the step surface; and the frustoconical portion abuts against or separates from a lower opening of the guide channel so as to open or close the pilot valve port.
17 . The solenoid valve according to claim 1 , wherein the on-off assembly comprises a piston body and a pilot valve block provided on the piston body; the intermediate channel comprises a piston channel provided in the piston body and a guide channel provided in the pilot valve block; an upper opening of the guide channel is the valve guide port; and the piston channel is in communication with the first flow port; the piston body comprises a first cylindrical section connected to the pilot valve block, wherein the first cylindrical section moves axially along an inner wall of the installation cavity; and an installation channel in communication with the guide channel is provided inside the first cylindrical section, and the installation channel is a part of the piston channel; the solenoid valve further comprises a check valve, wherein at least a part of the check valve is movably provided in the installation channel, the check valve is used for blocking an opening of the guide channel below the valve guide port; and the pilot valve block is fixed on the piston body by threaded connection.
18 . The solenoid valve according to claim 17 , wherein at least a part of the pilot valve block is located in the installation channel, and the check valve is located outside the guide channel; or, at least a part of the guide valve block is located in the installation channel, and the check valve is located in the guide channel; and a part of the pilot valve block located in the installation channel is in threaded connection with an inner wall of the installation channel.
19 . The solenoid valve according to claim 17 , wherein the pilot valve block comprises an insertion section, a limiting section and a pilot valve section which are sequentially connected, wherein the limiting section is located outside the piston body; the insertion section is located in the piston body and is in threaded fit with an inner wall of the piston channel; the guide channel passes through the insertion section, the limiting section and the pilot valve section, and the pilot valve port is located on the pilot valve section; and an outer wall of the limiting section abuts against an outer wall of the piston body in an axial direction so as to achieve axial limiting.
20 . The solenoid valve according to claim 19 , wherein a sharp corner structure is provided on the outer wall of the limiting section, and the sharp corner structure is in abutting fit with the outer wall of the piston body.

Description

CROSS REFERENCE TO RELATED APPLICATIONS The present disclosure claims priority to patent application no. 202321572335.1, entitled “Solenoid Valve”, and filed to the China National Intellectual Property Administration on Jun. 19, 2023; the present disclosure further claims priority to patent application no. 202322153241.7, entitled “Solenoid Valve”, and filed to the China National Intellectual Property Administration on Aug. 10, 2023;the present disclosure further claims priority to patent application no. 202322153252.5, entitled “Solenoid Valve”, and filed to the China National Intellectual Property Administration on Aug. 10, 2023;the present disclosure further claims priority to patent application no. 202322161103.3, entitled “Solenoid Valve”, and filed to the China National Intellectual Property Administration on Aug. 10, 2023;the present disclosure further claims priority to patent application no. 202322165781.7, entitled “Solenoid Valve”, and filed to the China National Intellectual Property Administration on Aug. 10, 2023;the present disclosure further claims priority to patent application no. 202322158470.8, entitled “Solenoid Valve”, and filed to the China National Intellectual Property Administration on Aug. 10, 2023;the present disclosure further claims priority to patent application no. 202322155411.5, entitled “Solenoid Valve”, and filed to the China National Intellectual Property Administration on Aug. 10, 2023; andthe present disclosure further claims priority to patent application no. 202322155812.0, entitled “Solenoid Valve”, and filed to the China National Intellectual Property Administration on Aug. 10, 2023. TECHNICAL FIELD The present disclosure relates to the technical field of solenoid valves, and in particular, to a solenoid valve. BACKGROUND Currently, in existing solenoid valves, due to a relatively large spacing between a movable iron core and a static iron core of the solenoid valve, when the movable iron core and the static iron core are attracted, the movable iron core has a relatively large speed, which easily generates a relatively large collision noise, and easily causes collision damage to the movable iron core and the static iron core. An existing pilot-operated solenoid valve generally uses a stationary static iron core and a movable iron core that moves vertically along an axial direction, and a pilot valve port of a piston is opened or blocked by the movable iron core, such that the piston opens or closes a main valve port. For example, Chinese patent of publication no. CN207034187U includes a main valve body, a piston assembly, a valve cover assembly, and a coil assembly; wherein the main valve body is provided with an inlet, an outlet, a valve cavity communicating the inlet and the outlet, and a connection port in communication with the valve cavity; the valve cover assembly includes a valve cover and a sleeve, the valve cover is connected to the connection port; the piston assembly includes a first piston for opening or closing a valve port, the first piston is provided with a first pilot valve port and a first balancing hole which are axially through the first piston, and the first piston is connected to a first piston spring which enables the first piston to get away from the valve port; and the piston assembly further includes a second piston for opening and closing the first pilot valve port, and the second piston is provided with a second pilot valve port and a second balancing hole which are axially through the second piston, and the second piston is connected to a second piston spring which enables the second piston to get away from the first pilot valve port. For another example, in CN207034187U, after de-energization, the first piston closes the valve port. After energization, an iron core rises for the first time to open the second pilot valve port, then the iron core and the first piston rise again synchronously until the iron core is attracted with an attractor, and the first piston opens the valve port. A height of the first rise of the iron core is defined as an opening degree of the second pilot valve port, and a height of the second rise of the iron core is defined as an opening degree of the first piston. Therefore, in the de-energization state, a distance between the iron core and the attractor is the sum of the opening degree of the second pilot valve port and the opening degree of the first piston. The distance between the iron core and the attractor is relatively large, the speed of the iron core when moving to be attracted with the attractor is relatively large, and the iron core collides with the attractor at a relatively large speed, thereby generating large noise. The solenoid valve mentioned above is a normally-closed valve, and usual operating state thereof is closed (for example: when the coil assembly is energized, the movable iron core moves by a certain distance to open the pilot valve port, and then the movable iron core continues to mov