CN-117366921-B - Switching valve and refrigeration cycle system

CN117366921BCN 117366921 BCN117366921 BCN 117366921BCN-117366921-B

Abstract

The invention provides a switching valve and a refrigeration cycle system capable of improving strength against external force and inhibiting size. The pilot driving part (12) of the switching valve (10) is provided with a valve seat member (122) fixed to the switching valve body (11), a plurality of tubule communication holes connected to a plurality of tubules connected to the peripheral surface and forming a flow path of driving fluid together with the tubules are formed in the valve seat member (122), and a valve seat through hole (122 d) penetrating from a fixed part (122 c) of the switching valve body (11) to an inlet part (122 b) entering the pilot body (121) and forming a flow path of driving fluid, the valve seat through hole (122 d) is opened in a manner deviating from the valve seat (122 a), the plurality of tubule communication holes are opened in the valve seat (122 a), and a main body through hole (111 a) forming a flow path of driving fluid together with the valve seat through hole (122 d) is formed in the outer wall of the main casing (111) of the switching valve body (11).

Inventors

MITOME RYO
MURATA MASAHIRO
WATANABE HIDEGO
Gang Tian Cong
Nomochi daiichiro

Assignees

株式会社鹭宫制作所

Dates

Publication Date: 20260508
Application Date: 20230625
Priority Date: 20220706

Claims (11)

1. A switching valve is characterized by comprising: A switching valve body having a main spool therein, for receiving the sliding movement of the main spool and switching the flow path state; A pilot driving part for sliding the main spool by using a predetermined driving fluid, and A plurality of tubules connected to the pilot driving unit to pass the driving fluid, The pilot driving part comprises a pilot main body and a valve seat component, wherein, The pilot body has a sub spool incorporated therein, and slides the sub spool to switch a flow path state of the driving fluid to slide the main spool, The valve seat member is a portion that is fixed to the switching valve body so that a part thereof is connected to the plurality of tubules and the other part thereof enters the pilot body to form a valve seat, and is formed with a plurality of tubule communication holes that are connected to the plurality of tubules and form a flow path for the driving fluid together with the plurality of tubules, and a valve seat through-hole that penetrates from the fixed part of the switching valve body to an entering part into the pilot body to form the flow path for the driving fluid, one of the plurality of tubule communication holes and the valve seat through-hole being opened so as to deviate from the valve seat, and the other plurality of holes being opened at the valve seat to be opened and closed by the auxiliary spool, The switching valve main body includes the main spool and a main housing, wherein, The main housing accommodates the main spool, the valve seat member of the pilot driving portion is fixed to an outer wall, and a main body through hole which communicates with the valve seat through hole and which forms a flow path of the driving fluid together with the valve seat through hole is formed in the outer wall.
2. The switching valve according to claim 1, wherein, A plurality of joint pipes respectively communicating with the inside of the main casing are connected to the switching valve main body, The valve seat member of the pilot driving portion is fixed to an outer wall of the main housing so that the valve seat through-hole is connected to a valve chamber of a high-pressure joint pipe through which a relatively high-pressure fluid flows, of the plurality of joint pipes, via the main body through-hole.
3. The switching valve according to claim 1, wherein, The main housing is formed in a cylindrical shape, and accommodates the main spool so that the main spool slides along an axis thereof, The pilot body includes the sub spool and a sub housing, wherein, The sub-housing is formed in a cylindrical shape, and accommodates the sub-spool so that the sub-spool slides along an axis thereof, The pilot driving portion is attached to the switching valve body in a configuration in which an axis of the main casing and an axis of the sub-casing extend along each other.
4. The switching valve according to claim 1, wherein, A plurality of joint pipes connected to the inside of the main casing in a manner such that the respective axes thereof are contained in one plane, The switching valve main body, the pilot driving portion, and the plurality of joint pipes are arranged such that the main spool and the sub spool each slide in an in-plane direction including a plane of axes of the plurality of joint pipes.
5. The switching valve according to claim 1, wherein, The valve seat member is a columnar member having one end portion serving as the inlet portion and the other end portion serving as the fixing portion, and has a flat surface extending in the axial direction as a part of the peripheral surface, The plurality of tubules are connected to the flat surface.
6. The switching valve according to claim 1, wherein, The pilot body in the pilot driving section includes: A plunger that holds the sub spool and is provided so as to be slidable along a predetermined slide axis; A plunger tube that slidably accommodates the plunger together with the sub spool; A coil part wound around the outer periphery of the plunger tube, the coil part being supplied with current to slide the plunger along the sliding axis, and A bonding portion for bonding a lead wire for supplying the current to the coil portion, The engagement portion is provided to avoid interference with the switching valve body from the coil portion, and is provided to protrude from the coil portion in an orthogonal direction orthogonal to the sliding axis, The coil part is configured to have a first portion provided with the joint part and a second portion other than the first portion, The first length from the sliding axis to the fixed end of the switching valve main body in the valve seat member is shorter than the second length from the sliding axis to the protruding end of the joint portion, and longer than the third length from the sliding axis to the outer surface of the second portion in the coil portion.
7. The switching valve according to claim 1, wherein, The valve seat member is a columnar member having one end portion serving as the inlet portion and the other end portion serving as the fixed portion, a pillar portion positioned between the pilot body and the switching valve body and fixed to the switching valve body at the fixed portion to support the pilot body, the pillar portion being thicker than the inlet portion, and a stepped portion being formed at a boundary between the pillar portion and the inlet portion, The step portion is fixed to the pilot body in a state where the step portion is engaged with the outer peripheral surface of the pilot body in a contact manner.
8. The switching valve according to claim 1, wherein, The valve seat member is a member in which the plurality of tubule communication holes and the valve seat through-hole are formed in a solid body.
9. The switching valve according to claim 1, wherein, A valve seat side engagement surface which is in contact engagement with the switching valve body surface is formed on the fixed portion of the valve seat member, An outer wall of the main housing of the switching valve main body is formed with a receiving recess which receives the fixing portion and whose main body side engagement plane surface in surface contact with the valve seat side engagement plane surface is a bottom surface, The fixing portion is fixed to an outer wall of the main casing in a state in which a part of an outer peripheral surface of the fixing portion surrounding the valve seat side engagement surface is engaged so as to be in contact with a part of an inner peripheral surface of the receiving recess.
10. The switching valve according to any one of claim 1 to 9, wherein, The valve seat through hole in the valve seat member is provided with a first hole portion on the side of the inlet portion, a second hole portion which is located on the side of the fixed portion and has a larger diameter than the first hole portion, and a step portion which is located at the boundary between the first hole portion and the second hole portion and connects the two hole portions, The main body through hole in the main housing is a hole having a smaller diameter than the second hole portion in the valve seat through hole, Further comprises a filter accommodated in the second hole portion for removing foreign matter from the driving fluid flowing through the valve seat through hole, The step portion restricts movement of the filter toward the first hole portion side in the second hole portion, The peripheral edge portion of the main body through hole in the outer wall of the main housing restricts movement of the filter toward the main body through hole side in the second hole portion.
11. A refrigeration cycle system, characterized in that, The refrigerant compressor of the present invention is provided with a compressor for compressing a fluid refrigerant, a first heat exchanger functioning as a condenser in a cooling mode, a second heat exchanger functioning as an evaporator in a cooling mode, an expansion mechanism for expanding the refrigerant between the first heat exchanger and the second heat exchanger and reducing the pressure, and the switching valve of claim 1.

Description

Switching valve and refrigeration cycle system Technical Field The present invention relates to a switching valve for switching a flow path of a refrigerant used in a refrigeration cycle system such as an air conditioner, and a refrigeration cycle system. Background In the related art, a switching valve is disclosed that is configured to include a pilot driving portion that is coupled to a switching valve body via a bracket to slide a spool therein, and that includes a plurality of tubules connected to the pilot driving portion to allow a driving fluid of the main spool to pass therethrough (see, for example, patent document 1). Among brackets in which the pilot drive portion is coupled to the switching valve body, there is a metal plate processing type having a pair of holding plates having one end side fixed to the switching valve body and the other end side holding the pilot drive portion, and the type of brackets are also used in the switching valve described in patent document 1. Prior art literature Patent literature Patent document 1 Japanese patent laid-open publication No. 2010-112437 Disclosure of Invention Problems to be solved by the invention Here, most brackets formed as the above-described metal plate members are easily deformed, and the strength against external force is often low, leaving room for improvement. In addition, the number of components of the switching valve in this manner is large, and there is room for improvement in this respect. The invention aims to provide a switching valve and a refrigeration cycle system which can improve strength against external force and can restrain size. Means for solving the problems The switching valve of the present invention is characterized by comprising a switching valve body having a main spool therein for receiving the sliding movement of the main spool to switch a flow path state, a pilot driving section for sliding the main spool using a predetermined driving fluid, and a plurality of tubules connected to the pilot driving section to pass the driving fluid, wherein the pilot driving section includes a pilot body having a sub spool therein for switching the flow path state of the driving fluid to slide the sub spool, and a valve seat member for connecting the tubules and fixing a portion thereof to the switching valve body and a portion thereof to enter the pilot body to form a valve seat, wherein the pilot driving section is formed with a plurality of tubules connected to the tubules to form a flow path of the driving fluid together with the tubules, and a valve seat through which penetrates from a fixing portion thereof to an entering portion thereof to form a flow path of the driving fluid, wherein the plurality of tubules and the valve seat through which is formed with a through hole in the main body are separated from the main spool, and the valve seat through which is formed with a plurality of the valve seat through hole is opened, and the valve seat is opened from the main spool and the main spool is opened to the main valve seat through the outer wall. The switching of the channel state herein is a technical concept including switching of a channel in which a certain channel is changed to another channel, and switching of opening and closing of a channel in which one channel is closed or opened. According to this switching valve, since the valve seat member constituting the pilot driving portion is directly fixed to the switching valve body, strength against external force can be improved as compared with a case where the pilot driving portion and the switching valve body are coupled using a bracket formed of a metal plate. Further, since the bracket is not required, the number of components can be suppressed, and accordingly the size of the switching valve can be suppressed. Here, it is preferable that a plurality of joint pipes communicating with the inside of the main casing are connected to the switching valve main body, and the valve seat member of the pilot driving portion is fixed to the outer wall of the main casing so that the valve seat through-hole is connected to a valve chamber communicating with a high-pressure joint pipe through which a relatively high-pressure fluid flows, of the plurality of joint pipes, via the main body through-hole. According to this configuration, the high-pressure fluid flow path connecting the valve chamber of the switching valve body to the pilot drive section is constituted by the valve seat through-hole in the valve seat member and the body through-hole in the switching valve body. This makes it possible to further improve the strength by minimizing the flow passage of the high-pressure fluid, as compared with the case where the valve chamber and the pilot drive section are connected by the high-pressure tubule, and to further reduce the size of the switching valve by eliminating the need for the high-pressure tubule. Preferably, the main casing is formed in a tubular shape, and houses the