CN-121977089-A - Switching valve and crankcase ventilation system

Abstract

The application relates to the technical field of valve bodies, and discloses a switching valve and a crankcase ventilation system. The switching valve comprises a shell, a valve body assembly, a reset elastic piece, a thermosensitive elastic piece, a heating piece and a heat-conducting piece, wherein the shell comprises a first cavity, a second cavity and a first communication port, the first communication port is used for communicating the first cavity with the second cavity, the first interface, the second interface and the third interface are communicated with the first cavity, the third interface is communicated with the second cavity, the valve body assembly is located in the first cavity and/or the second cavity and is arranged to be movable along a first direction, the valve body assembly is elastically connected with the shell, the acting force of the thermosensitive elastic piece on the valve body assembly changes along with the temperature of the valve body assembly, and the heating piece is installed on the shell and is in heat conduction connection with the thermosensitive elastic piece. According to the switching valve provided by the embodiment of the application, the switching valve can be connected with a plurality of ventilation pipes, and the connection relation between the ventilation pipes can be simply and correctly switched.

Inventors

• JIA WEIXIN

Assignees

• 上海大创汽车技术有限公司

Dates

Publication Date

20260505

Application Date

20260326

Claims (16)

1. 1. A switching valve for a crankcase ventilation system, the switching valve comprising: The shell comprises a first chamber, a second chamber and a first communication port, wherein the first chamber and the second chamber are arranged along a first direction, and the first communication port is used for communicating the first chamber with the second chamber; The first interface is communicated with the first cavity, the second interface is communicated with the second cavity, and the third interface is communicated with the second cavity; A valve body assembly located in the first chamber and/or the second chamber and configured to be movable in the first direction; a return elastic member elastically connecting the valve body assembly with the housing; a thermosensitive elastic member elastically connecting the valve body assembly with the housing, the acting force of the thermosensitive elastic member on the valve body assembly changing with the temperature thereof, and The heating element is arranged on the shell and is in heat conduction connection with the thermosensitive elastic element, Wherein the switching valve has a first state and a second state, In the first state, the valve body assembly is positioned at a position for plugging the first communication port under the action of at least one of the thermosensitive elastic piece or the reset elastic piece; In the second state, the heating element heats the thermosensitive elastic element, and the acting force of the thermosensitive elastic element on the valve body assembly is larger than the acting force of the reset elastic element on the valve body assembly, so that the valve body assembly is positioned at a position where the first communication port is opened.
2. 2. The switching valve according to claim 1, wherein the valve body assembly includes a first valve body including a through hole that communicates the first chamber with the second chamber, and a second valve body having an area of a cross section perpendicular to the first direction smaller than an area of a cross section perpendicular to the first direction of the first valve body, the second valve body being provided at the through hole and being movable in the first direction with respect to the first valve body, the heat-sensitive elastic member being connected to the second valve body.
3. 3. The switching valve of claim 2, further having a third state, the switching valve undergoing the third state during a transition from the first state to the second state, In the first state, the second valve body seals the through hole, and the first valve body seals the first communication port; In the third state, the heating element heats the thermosensitive elastic element, the thermosensitive elastic element enables the second valve body to open the through hole, and the first valve body seals the first communication port; in the second state, the first valve body opens the first communication port.
4. 4. The switching valve according to claim 2, wherein the return elastic member includes a first elastic member elastically connecting the second valve body with the housing.
5. 5. The switching valve according to claim 2, wherein the return elastic member includes a first elastic member elastically connecting the second valve body with the housing and a second elastic member elastically connecting the first valve body with the housing.
6. 6. The switching valve according to claim 2, wherein the return elastic member includes a second elastic member elastically connecting the first valve body with the housing, and a third elastic member elastically connecting the second valve body with the first valve body.
7. 7. The switching valve according to claim 2, wherein the first end of the thermo-sensitive elastic member is fixedly connected with respect to the housing, the second end of the thermo-sensitive elastic member is fixedly connected with the second valve body, and the return elastic member includes a second elastic member elastically connecting the first valve body with the housing.
8. 8. The switching valve according to claim 1, further comprising: And the heat conduction assembly is in heat conduction connection with the heating piece and extends into the first cavity and/or the second cavity.
9. 9. The switching valve of claim 8, wherein the thermally conductive assembly comprises: the first heat conduction piece is at least partially positioned in the first cavity, and the first heat conduction piece is in contact with the heating piece and the thermosensitive elastic piece.
10. 10. The switching valve of claim 9, wherein the thermally conductive assembly further comprises: The second heat conduction piece is arranged on the valve body assembly and is contacted with the thermosensitive elastic piece; and a third heat conducting member in contact with the second heat conducting member and extending at least partially within the second chamber.
11. 11. The switching valve of claim 1, wherein in the second state, both the first port and the second port are in communication with the third port.
12. 12. The switching valve of claim 1, wherein in the second state, one of the first and second ports communicates with the third port, and a passage between the other port and the third port is blocked by the valve body assembly.
13. 13. The switching valve of claim 12, wherein the first chamber comprises a first subchamber, a second subchamber, and a second communication port, the second communication port communicating the first subchamber with the second subchamber, the first interface communicating with the second subchamber, the second interface communicating with the first subchamber; In the second state, the valve body assembly is located at a position where the first communication port is opened and the second communication port is blocked, and the second port is communicated with the third port.
14. 14. The switching valve according to claim 1, further comprising: And the one-way valve assembly is arranged in the third interface and is used for enabling fluid to flow unidirectionally from the second chamber to the outside of the third interface.
15. 15. The switching valve according to claim 1, further comprising: and the pressure sensor is arranged at the third interface or the second chamber.
16. 16. The utility model provides a crankcase ventilation system, sets up in engine system, engine system includes engine, pressure regulating valve, intake pipe, the engine includes the crankcase, the intake pipe with the engine is connected and is used for to the engine provides gas, pressure regulating valve set up in the engine and with crankcase gas circuit intercommunication, pressure regulating valve includes first export and second export, its characterized in that crankcase ventilation system includes: a first ventilation pipe, a second ventilation pipe, a third ventilation pipe, a bypass ventilation pipe, a first check valve, and The switching valve according to any one of claims 1 to 15, wherein the first ventilation pipe is connected between the first outlet and a first port of the switching valve, one end of the second ventilation pipe is connected to a second port of the switching valve, the other end is connected to the air intake pipe through the first check valve, the first check valve is configured to allow fluid to flow unidirectionally from the second ventilation pipe to the air intake pipe, the third ventilation pipe is connected between the second outlet and the air intake pipe, one end of the bypass ventilation pipe is connected to a third port of the switching valve, and the other end is connected to the third ventilation pipe.

Description

Switching valve and crankcase ventilation system Technical Field The application relates to the technical field of valve bodies, in particular to a switching valve and a crankcase ventilation system. Background A crankcase ventilation system is provided in the engine system, which is typically connected to the intake pipe and the oil and gas outlet passage of the crankcase. In the non-diagnostic state, suction is applied from the oil and gas outlet passage of the crankcase using the frontal negative pressure of the intake pipe. The crankcase ventilation system also has a diagnostic status for diagnosing its own leakage. The crankcase ventilation system may include a plurality of ventilation ducts connected in a specific manner, and it may be necessary to switch the on-off relationship between the plurality of ventilation ducts in the diagnostic state and in the diagnostic state. In the related art, there is no switching valve capable of simply and correctly switching the connection relationship between ventilation pipes while connecting a plurality of ventilation pipes. Disclosure of Invention The embodiment of the application provides a switching valve and a crankcase ventilation system, wherein the switching valve can be connected with a plurality of ventilation pipes and can simply and accurately switch the connection relation between the ventilation pipes. In a first aspect, an embodiment of the present application provides a switching valve for a crankcase ventilation system, where the switching valve includes a housing, the housing includes a first chamber, a second chamber, and a first communication port, the first chamber and the second chamber are arranged along a first direction, the first communication port communicates the first chamber with the second chamber, a first interface, a second interface, and a third interface, the first interface and the second interface communicate with the first chamber, the third interface communicates with the second chamber, a valve body assembly is located in the first chamber and/or the second chamber and is configured to be movable along the first direction, a reset elastic member elastically connects the valve body assembly with the housing, a thermo-elastic member elastically connects the valve body assembly with the housing, a force applied by the thermo-elastic member to the valve body assembly changes with a temperature of the second chamber, and a heating member is mounted to the housing, the heating member is connected with the thermo-elastic member, the first interface and the second interface are located in the first chamber and/or the second interface, and the first elastic member is located in the first position. According to the foregoing embodiment of the first aspect of the present application, the valve body assembly includes a first valve body including a through hole that communicates the first chamber with the second chamber, and a second valve body having an area of a cross section perpendicular to the first direction smaller than an area of a cross section perpendicular to the first direction of the first valve body, the second valve body being disposed at the through hole and being movable in the first direction with respect to the first valve body, the thermosensitive elastic member being connected to the second valve body. According to some of the foregoing embodiments of the first aspect of the present application, the switching valve further has a third state, the switching valve being subjected to the third state in the course of transition from the first state, in which the second valve body blocks the through hole, and the first valve body blocks the first communication port, to which the heating member heats the heat-sensitive elastic member, which causes the second valve body to open the through hole, and which causes the first valve body to block the first communication port, to which the second valve body opens. According to some of the foregoing embodiments of the first aspect of the present application, the return elastic member includes a first elastic member elastically connecting the second valve body with the housing. According to some of the foregoing embodiments of the first aspect of the present application, the return elastic member includes a first elastic member elastically connecting the second valve body with the housing, and a second elastic member elastically connecting the first valve body with the housing. According to some of the foregoing embodiments of the first aspect of the present application, the return elastic member includes a second elastic member elastically connecting the first valve body with the housing, and a third elastic member elastically connecting the second valve body with the first valve body. According to some of the foregoing embodiments of the first aspect of the present application, the first end of the thermo-sensitive elastic member is fixedly connected to the housing, the second en