JP2005113990A - Selector valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten a distance of movement of a valve element along an axis of a valve housing between both most outside ends without changing a distance between two fluid ports positioned close to each other among a plurality of fluid ports provided in a valve seat, and to miniaturize a selector valve to be used for a main valve or a pilot valve of a four-way selector valve. <P>SOLUTION: The selector valves 12 and 14 are provided with the valve housings 22 and 48 provided with valve seats 24 and 50 having a plurality of fluid ports 30a-30c and 60a-60c arranged in a straight line or arranged zigzag, and valve elements 28 and 54 sliding in the axial direction 26 and 52 of the valve housings. The sliding surfaces of the valve elements are formed with recessed parts 46 and 80 for communicating adjacent fluid ports with each other, and length of the recessed part of the valve element is larger than the axial length between the most outside ends of the two fluid ports in the axial direction. Both the most outside end positions of the valve elements are determined so that the center position of the valve element is arranged close to one of the most outside ends than a central part of the two fluid ports inside the recessed part when the valve element is stopped in any one of the most outside ends and the two fluid ports are covered with the recessed parts. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a switching valve that selectively covers two of a plurality of fluid ports of a valve seat with a recess formed in a valve body and switches a flow passage in a fluid circuit.

  The switching valve is used for switching a fluid flow path in a fluid circuit. For example, a four-way switching valve, which is a kind of switching valve, is used for switching between a cooling circuit and a heating circuit in a refrigerant circuit.

  An example of such a four-way switching valve is described in Patent Document 1. This four-way switching valve includes a main valve and a pilot valve that operates the main valve, and the main valve is connected to a refrigerant circuit including a compressor, a condenser, and an evaporator. Then, the main valve is operated by driving the pilot valve, the direction of the refrigerant flowing through the refrigerant circuit is switched by the main valve, and the cooling circuit and the heating circuit are switched. The main valve has a valve housing, a valve seat provided in the valve housing and having three fluid ports arranged in a straight line in the axial direction of the valve housing, and a valve body that slides on the valve seat. The valve body is slid on the valve seat, and two adjacent fluid ports are selectively covered and communicated with each other by a recess provided on the sliding surface of the valve body. The pilot valve also has the same configuration as the main valve. In any of the valves, the length of the concave portion of the valve body in the axial direction of the valve housing is substantially equal to the distance between the outermost end edges of two adjacent fluid ports.

  Each fluid port of the main valve and the pilot valve is connected to a conduit through which a refrigerant flows. For these conduits, those having a diameter suitable for the flow rate of the refrigerant flowing through the conduits are used. Therefore, the diameter of the conduit has a minimum size, and each fluid port formed in the valve seat needs to be provided at a predetermined interval in consideration of the attachment of the conduit.

JP 11-201297 A

  In recent years, switching valves such as four-way switching valves have been required to be downsized. In order to reduce the size, it is effective to shorten the stroke of the valve body. In addition, when a solenoid coil is used to drive the valve body in the pilot valve, the stroke of the valve body is most shortened by the movable iron core connected to the valve body and the fixed iron core that attracts this by magnetic force. It leads to shortening the space | interval when leaving | separating, and it becomes possible to reduce the output of a solenoid coil. And as a result of using a low output solenoid coil, a solenoid coil can be reduced in size and a pilot valve can be reduced in size.

  However, as described above, each fluid port of the valve seat must be provided at a predetermined distance from the nearest fluid port. For this reason, the movement of the valve body along the longitudinal axis direction of the valve housing is shortened by shortening the distance between two adjacent fluid ports among the three fluid ports aligned in a straight line in the longitudinal axis direction of the valve housing. It is difficult to shorten the distance.

Therefore, the object of the present invention is to solve the above-mentioned problems in the prior art without changing the distance between two fluid ports located closest to each other among the plurality of fluid ports provided in the valve seat. It is to shorten the distance that the valve body moves between the extreme positions along the axis of the valve housing.
Another object of the present invention is to downsize a switching valve used as a main valve and a pilot valve of a four-way switching valve.

  In order to achieve the above object, as a first aspect of the present invention, as a first aspect of the present invention, there is provided a valve housing having a valve seat having an axial line and a plurality of fluid ports arranged in the axial direction, and the axial line on the valve seat. And a valve body having a recess formed on the sliding surface for selectively communicating two adjacent fluid ports on the valve seat, the valve body having one predetermined extreme In the switching valve that is stopped at any one of a predetermined extreme position and the other extreme position, the axial length of the concave portion of the valve body is the outermost edge in the axial direction of the two adjacent fluid ports Greater than the distance in the axial direction between the two extreme positions of the valve body when the valve body is stopped at either extreme position and the two fluid ports are covered by the recess. Of one of the fluid ports on the other extreme side A switching valve that is defined on the other extreme position side of the port so as to define a larger margin area in the concave portion than one extreme position side of one of the two fluid ports. Is provided.

  In the above switching valve, the length of the concave portion of the valve body in the axial direction of the valve housing is larger than the distance between the outermost edges of two adjacent fluid ports on the valve seat, and the valve body stops at one of the extreme positions. A large margin area is defined on the other extreme position side of the fluid port on the other extreme position of the two fluid ports in the recess while completely covering the two fluid ports in the recess. It is like that. That is, when the valve body is stopped at one extreme position, the center of the concave portion of the valve body in the axial direction of the valve housing is positioned closer to the other extreme position than the center of the two adjacent fluid ports. . Accordingly, when the valve body moves from one extreme position to the other extreme position, the distance between the outermost edge ends of the two fluid ports adjacent to each other in the length of the concave portion of the valve body in the axial direction of the valve housing as in the prior art. Compared with the case where the center of the recess in the axial direction of the valve housing is located at the center of two adjacent fluid ports, the amount of movement of the valve body, that is, the stroke becomes shorter.

  As a second aspect of the present invention, there is provided a valve housing having a valve seat having an axial line and a plurality of fluid ports arranged in the axial direction, and sliding on the valve seat in the axial direction. And a valve body having a recess formed in the sliding surface for selectively communicating two adjacent fluid ports on the seat, the valve body having a predetermined extreme position and a predetermined other In the switching valve that is stopped at any one of the extreme positions, there is provided a switching valve in which the plurality of fluid ports are provided on the valve seat in a staggered arrangement in the axial direction.

  In the switching valve, since a plurality of fluid ports are provided in the valve seat in a staggered arrangement in the axial direction of the valve housing, each fluid port is attached to each fluid port with respect to the nearest fluid port. Compared to the case where each fluid port is arranged in a straight line while being arranged with a distance of at least the minimum distance so that the conduits do not interfere with each other, it is at the extreme positions in the axial direction of the valve housing. The distance between certain fluid ports is reduced. Therefore, the amount of movement of the valve body, that is, the stroke when the valve body moves from one extreme position to the other extreme position is shortened.

  Preferably, in the switching valve according to the second aspect, the axial length of the concave portion of the valve body is greater than the axial distance between the axially outermost edges of the two adjacent fluid ports. The two extreme positions of the valve body are large when the valve body is stopped at one extreme position and the two ports are covered with the recess. A margin region larger than one extreme position side of one of the two fluid ports is defined in the recess on the other extreme position side of the fluid port on the side. Yes.

  For example, the switching valve is a main valve of a four-way switching valve that is connected to a fluid circuit and switches a flow path of the fluid circuit, the main valve having three fluid ports in the valve seat, and the valve housing And an additional port.

  The switching valve is a pilot valve for operating a main valve of a four-way switching valve that is connected to a fluid circuit and switches a flow path of the fluid circuit, and the pilot valve has three fluid ports in the valve seat. And an additional port in the valve housing.

  According to the switching valve of the present invention, the stroke of the valve body is shortened, and the switching valve can be downsized.

  Hereinafter, some embodiments of the switching valve of the present invention will be described with reference to the drawings.

FIG. 1 is an example of the switching valve of the present invention, and is an overall configuration diagram of a four-way switching valve 10 configured according to the present invention.
The four-way switching valve 10 includes a main valve 12 and a pilot valve 14 fluidly connected to the main valve 12 through a narrow tube. The main valve 12 includes a compressor 16, a condenser 18, and an evaporator 20. Connected to the refrigerant circuit. The operation of the main valve 12 is controlled by the pilot valve 14, and the flow path of the refrigerant flowing through the refrigerant circuit is switched to switch between the cooling circuit and the heating circuit.

  The main valve 12 includes a cylindrical main valve housing 22, a valve seat 24 disposed in an intermediate portion of the main valve housing 22, and a valve that slides on the valve seat 24 in the axial direction 26 of the main valve housing 22. And a body 28. The valve seat 24 has three fluid ports 30 a, 30 b, 30 c formed in a straight line in the axial direction 26 of the main valve housing 22. A low pressure pipe 32 communicating with the inlet of the compressor 16 is connected to the fluid port 30a in the center of the valve seat 24. The fluid ports 30b and 30c on both sides of the center fluid port 30a, that is, both extreme positions are respectively connected to the condenser 18. A conduit 34 that communicates with a conduit 36 that communicates with the evaporator 20 is connected. A high-pressure pipe 38 communicating with the outlet of the compressor 16 is connected to a position facing the valve seat 24 in the middle part of the main valve housing 22.

  In the main valve housing 22, a pair of pistons 42 and 44 integrally connected by a bracket 40 are disposed on both sides of the valve seat 24 in the axial direction 26 of the main valve housing 22. It can slide integrally along the axial direction 26. A valve body 28 is held at the center of the connecting shaft 40. The valve body 28 slides on the valve seat 24 according to the movement of both pistons 42 and 44, and stops at predetermined extreme left and right positions. To do. A recess 46 is formed on the sliding surface of the valve body 28, and the valve body 28 covers two adjacent fluid ports 30 a, 30 b, and 30 c at the left and right extreme positions with the recess 46, The high pressure tube 38 is selectively communicated with one of the two conduits 34, 36 and the low pressure tube 32 is selectively communicated with the other of the two conduits 34, 36.

  On the other hand, the pilot valve 14 includes a cylindrical pilot valve housing 48, a valve seat 50 disposed in the pilot valve 14, and a valve body 54 that slides on the valve seat 50 in the axial direction 52 of the pilot valve housing 48. And a solenoid tube 56 having one end inserted into the pilot valve housing 48 and a solenoid coil 58 surrounding the other end of the solenoid tube 56. The valve seat 50 has three fluid ports 60 a, 60 b, 60 c (see FIGS. 2 and 3) formed in a straight line in the axial direction 52 of the pilot valve housing 48. A low pressure thin tube 62 communicating with the low pressure pipe 32 is connected to the fluid port 60a at the center of the valve seat 50. The fluid ports 60b and 60c on both sides of the center fluid port 60a, i.e., both extreme positions, are respectively connected to the main valve housing 22. A pair of thin tubes 64 and 66 communicating with both ends are connected. Further, a high-pressure narrow tube 68 communicating with the high-pressure tube 38 is connected to a position facing the valve seat 50 in the pilot valve housing 48.

  In the solenoid tube 56, a fixed iron core 70 is fixed to an end portion on the side close to the solenoid coil 58, and a movable iron core 72 is slidably accommodated facing the fixed iron core 70. An urging spring 74 is disposed between the fixed iron core 70 and the movable iron core 72 and urges the movable iron core 72 toward the side away from the fixed iron core 70. Further, the valve body 54 is coupled to the end portion of the movable iron core 72 near the pilot valve housing 48 via the valve body holder 76. Accordingly, by controlling the operation of the renoid coil 58 by the control means 78, the valve element 54 is placed on the valve seat 50 by attracting the movable core 72 to the fixed core 70 or releasing the movable core 72 from the fixed core 70. Is slid in the axial direction 52 of the pilot valve housing 48 and stopped at a predetermined extreme position on either the left or right side. A recess 80 is formed on the sliding surface of the valve body 54, and the valve body 54 covers the adjacent two of the three fluid ports 60 a, 60 b, 60 c with the recess 46 at both extreme positions on the left and right. The high pressure capillary 68 is selectively communicated with one of the pair of capillaries 64, 66 and the low pressure capillary 62 is selectively communicated with the other of the pair of capillaries 64, 66.

  As best shown in FIGS. 2 and 3, the valve body 54 of the pilot valve 14 of the four-way switching valve 10 of FIG. 1 is provided in the valve seat 50 with the length in the axial direction 52 of the pilot valve housing 48. The distance m between the outermost edges in the axial direction 52 of two adjacent fluid ports 60a, 60b, 60c (in this case, the value obtained by adding the fluid port pitch d to the fluid port pitch P) is a length m. It is getting bigger. Here, the pitch P of the fluid ports 60a, 60b, 60c means the distance between corresponding points on the edges of the fluid ports 60a, 60b, 60c located closest to each other.

  Further, the left extreme position of the valve body 54 of the pilot valve 14 is set such that the valve body 54 is stopped at a predetermined extreme position on the left side in the drawing as shown by a solid line in FIG. When the ports 60a and 60c are covered with the recess 80, the right side of the right fluid port 60a of these two fluid ports 60a and 60c is larger than the left side of the left fluid port 60c (the dimension in the axial direction 52). ) M margin areas (ie, margin spaces) are defined in the recess 80. Similarly, the right extreme position of the valve body 54 of the pilot valve 14 is set such that the valve body 54 is stopped at a predetermined right extreme position as indicated by a dotted line in FIG. When the ports 60a and 60b are covered with the recess 80, a margin region having a width m larger than the right side of the right fluid port 60b is formed on the left side of the left fluid port 60a of the two fluid ports 60a and 60b. 80, as specified in 80.

  By configuring the valve body 54 of the pilot valve 14 in this way, the stroke of the valve body 54 when the valve body 54 moves between the right extreme position and the left extreme position (in the case of the four-way switching valve 10, the valve body). The distance (S) for changing the position of the fluid ports 60a, 60b, 60c covered by 54 by one is smaller than the pitch P of the fluid ports 60a, 60b, 60c, as shown in FIG. . For example, as shown in FIG. 3, when the valve body 54 is in the left extreme position, the margin region is not defined on the left side of the left fluid port 60c in the recess 80 and the concave portion is in the right extreme position. When a margin area is not defined on the right side of the right fluid port 60b in 80, the stroke S of the valve body 54 when moving between the right extreme position and the left extreme position is the pitch of the fluid ports 60a, 60b, 60c. The distance m is shorter than P.

  Thus, the stroke S of the valve body 54 is shortened, so that a gap generated between the fixed iron core 70 and the movable iron core 72 when the movable iron core 72 moves toward the pilot valve housing 48 in the solenoid tube 56 is reduced. Therefore, the pilot valve 14 can be downsized. Further, since the gap between the fixed iron core 70 and the movable iron core 72 is reduced, the movable iron core 72 can be attracted to the fixed iron core 70 with a smaller magnetic force, so that the solenoid coil 58 having a smaller output, that is, a single layer. A small solenoid coil 58 can be used for the pilot valve 14, and the pilot valve 14 can be further miniaturized.

  As shown in FIG. 1, the valve body 28 of the main valve 12 of the four-way switching valve 10 has the same configuration, and the length of the recess 46 of the valve body 28 in the axial direction 26 of the main valve housing 22. Is larger than the distance between the outermost edges in the axial direction 26 of the two adjacent fluid ports 30a, 30b, 30c, and the extreme positions of the valve element 28 are stopped at either extreme position. Sometimes, the two fluid ports 30a, 30b or 30a, 30c on the other extreme position side of the fluid port 30a on the other extreme position side of the two fluid ports 30a, 30b or 30a, 30c in the recess 46 Is defined so as to define a margin region having a width larger than that of one extreme position of the fluid port 30b or 30c on one extreme position.

  The main valve 12 of the four-way switching valve 10 configured as described above can shorten the stroke of the valve body 28 in the same manner as the pilot valve 14, and the main valve 12 can be downsized.

Next, the operation of the four-way switching valve 10 in FIG. 1 will be described.
When the solenoid coil 58 of the pilot valve 14 is turned off by the control means 78, the movable iron core 72 of the pilot valve 14 is urged by the urging spring 74 and moves to the left in FIG. The body 54 is stopped at the left extreme position and the left two fluid ports 60a, 60c are covered with the recess 80. At this time, the center of the concave portion 80 of the valve body 54 is located closer to the fluid port 60a on the right side than the center between the two fluid ports 60a and 60c, and in the concave portion 80, as indicated by a solid line in FIG. A margin region having a larger width than the left side of the left fluid port 60c is defined on the right side of the right fluid port 60a.

  When the valve body 54 is in the left extreme position, the narrow pipe 66 and the low pressure thin pipe 62 connected to the fluid port 60c in the left extreme position are communicated with each other, and the narrow pipe 64 and the high pressure narrow pipe 68 connected to the fluid port 60b in the right extreme position. To communicate with. In this state, the low pressure pipe 32 communicates with a space formed between the left end surface and the left piston 44 in the main valve housing 22, and between the right end surface and the right piston 42 in the main valve housing 22. The high pressure pipe 38 communicates with the space to be formed. As a result, as both pistons 42 and 44 move in the left direction, the valve element 28 of the main valve 12 moves to a predetermined left extreme position and stops, and the two left sides of the valve seat 24 of the main valve 12 are stopped. The two fluid ports 30 a and 30 c are covered with the recess 46. At this time, the center of the concave portion 46 of the valve body 28 is located closer to the right fluid port 30a than the center between the two fluid ports 30a and 30c, and in the concave portion 46, the left fluid is located on the right side of the right fluid port 30a. A margin area having a width larger than that of the left side of the port 30c is defined. In this state, the conduit 36 connected to the fluid port 30c in the left extreme position and the low pressure pipe 32 communicate with each other, and the conduit 34 connected to the fluid port 30b in the right extreme position and the high pressure pipe 38 communicate with each other. Thus, a cooling circuit is formed.

  On the other hand, when the solenoid coil 58 is turned on by the control means 78, the movable iron core 72 is attracted to the fixed iron core 70 and moves to the right in FIG. 1 against the urging force of the urging spring 74. The valve body 54 is stopped at the right extreme position, and the two right fluid ports 60 a and 60 b are covered with the recess 80. At this time, the center of the concave portion of the valve body 54 is located closer to the fluid port 60a on the left side than the center between the two fluid ports 60a and 60b, and in the concave portion 80, as indicated by a dotted line in FIG. A margin region having a larger width than the right side of the right fluid port 60b is defined on the left side of the left fluid port 60a. Therefore, the stroke when the valve body 54 moves from the left extreme position to the right extreme position is shorter than the pitch of the fluid ports 60a to 60c.

  When the valve body 54 is in the right extreme position, the narrow pipe 64 and the high pressure capillary 68 connected to the fluid port 60c in the left extreme position and the narrow pipe 64 and the low pressure capillary 62 connected to the fluid port 60b in the right extreme position are communicated. Communicate with. In this state, the high-pressure pipe 38 communicates with a space formed between the left end surface and the left piston 44 in the main valve housing 22, and between the right end surface and the right piston 42 in the main valve housing 22. The low pressure pipe 32 communicates with the space to be formed. As a result, as both pistons 42 and 44 move in the right direction, the valve body 28 of the main valve 12 moves to a predetermined right extreme position and stops. The two fluid ports 30 a and 30 b are covered with the recess 46. Also at this time, the center of the recess 46 of the valve body 28 is located closer to the left fluid port 30a than the center between the two fluid ports 30a and 30b. A margin area having a width larger than that of the right side of the port 30b is defined. Therefore, the stroke when the valve body 28 moves from the left extreme position to the right extreme position is shorter than the pitch of the fluid ports 30a to 30c. In this state, the conduit 34 connected to the fluid port 30b in the right extreme position and the low pressure pipe 32 communicate with each other, and the conduit 36 connected to the fluid port 30c in the left extreme position and the high pressure pipe 38 communicate with each other. A heating circuit is formed.

  In this way, the main valve 12 and the pilot valve 14 of the four-way switching valve 10 according to the present invention switch the flow path with a shorter stroke of the valve bodies 28 and 54 than the conventional main valve and pilot valve. be able to.

  FIG. 4 is a cross-sectional view of another embodiment pilot valve 14 that may be used in the four-way selector valve 10 of FIG. In the pilot valve 14 ′ shown in FIG. 4, the pilot valve housing 48 is formed integrally with the solenoid tube 56, and the valve seat 50 is disposed in the solenoid tube 56. 1 is the same as the pilot valve 14 shown in FIG. 1 except that it is formed integrally with the movable iron core 72, and corresponding portions are denoted by the same reference numerals. An end cap 57 is attached to the end of the solenoid tube 56 opposite to the solenoid coil 58, and a high-pressure capillary 68 is connected to the end cap. The pilot valve 14 'of such an embodiment has the same advantages as the pilot valve 14 of FIG.

  FIG. 5 shows another embodiment of a valve seat 82 and a valve body 84 that can be used in the pilot valve 14 of the four-way switching valve 10 of FIG. In this embodiment, the three fluid ports 86a, 86b, 86c formed in the valve seat 82 are not formed in a straight line in the axial direction 52 of the pilot valve housing 48, but in a staggered arrangement. 1 to 3 in that the recess 88 extends in a direction perpendicular to the axial direction 52 of the pilot valve housing 48 so as to cover the fluid ports 86a, 86b, 86c in the staggered arrangement. Different from the embodiment shown.

  According to this configuration, it is possible to shorten the distance in the axial direction 52 between the fluid ports 86b and 86c at both extreme positions while maintaining the pitch between the adjacent fluid ports 86a, 86b and 86c. Therefore, the stroke of the valve body 84 when moving between the extreme positions can be made shorter than that of the valve body 54, and the pilot valve 14 can be further downsized. In particular, when the fluid ports 86a to 86c are arranged at the positions of the apexes of the regular triangle, the stroke of the valve body 84 can be shortened most. Of course, even if only this staggered fluid port is applied to a conventional pilot valve, the pilot valve can be reduced in size.

  FIG. 6 shows a valve seat 90 of an embodiment in which a staggered fluid port is applied to the main valve 12 of the four-way switching valve 10 of FIG. 1, and a valve body 92 is shown in a simplified manner. The diameters of the fluid ports 94a, 94b, 94c of the main valve 12 are larger than the diameters of the fluid ports 86a, 86b, 86c of the pilot valve 14 to correspond to the flow rate of the fluid circuit. The row of the ports 86b and 86c and the row of the lower fluid port 86a are offset in the vertical direction in FIG. 6 by the diameter of the fluid ports 86a to 86c (the radial direction of the main valve housing 22 on the surface of the valve seat 90). Then, the diameter of the main valve housing 22 may be increased. Therefore, in this embodiment, the upper fluid port 94b, 94c row and the lower fluid port 94a row are offset in the vertical direction in FIG. 6 by a distance smaller than the diameter of the fluid ports 94a, 94b, 94c. Yes. The other configuration is the same as that of the main valve 12 of the four-way switching valve 10 in FIG. 1 and will not be described in detail here.

  FIGS. 7 and 8 show another embodiment of the switching valve of the present invention having five fluid ports 100a-100e, 106a-106e in the pilot valve seat 96 and the main valve seat 102, respectively. The valve bodies 98, 104 are shown in a simplified manner. These embodiments are similar to the embodiments shown in FIGS. 1 to 6 in that the valve bodies 98 and 104 when the valve bodies 98 and 104 move between the extreme positions as compared with the conventional switching valve. This has the advantage that the stroke is shortened and the size can be reduced. Further, in the embodiment shown in FIG. 6, any three adjacent fluid ports are arranged at each vertex position of an equilateral triangle so that the stroke of the valve body 98 when moving between the extreme positions is the shortest. Has been.

  Although the present invention has been described with reference to the embodiment shown in the accompanying drawings, this embodiment is merely illustrative and not restrictive. In addition, since the scope of the present invention is limited by the scope of the claims, the above-described embodiments can be modified and changed without departing from the scope of the claims.

It is a whole block diagram of the four-way selector valve comprised according to this invention. It is an enlarged view of the valve seat and valve body of the pilot valve of the four-way selector valve of FIG. FIG. 3 is a partial cutaway view of the valve body and the valve seat of FIG. 2 as viewed from above. It is sectional drawing of the pilot valve of other embodiment which may be used in the four-way selector valve of FIG. FIG. 6 is a plan view of another embodiment of a valve seat that can be used in the pilot valve of the four-way switching valve of FIG. 1, with fluid ports provided in a staggered arrangement on the valve seat. It is a top view of the valve seat of other embodiment which may be used with the main valve of the four-way selector valve of FIG. 1, and the fluid port is provided on the valve seat in zigzag arrangement. It is the schematic of the valve seat and valve body of the pilot valve of the other switching valve comprised according to this invention. It is the schematic of the valve seat and valve body of the main valve of the other switching valve comprised according to this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Four-way switching valve 12 ... Main valve 14 ... Pilot valve 16 ... Compressor 18 ... Capacitor 20 ... Evaporator 22 ... Main valve housing 24 ... Valve seat 26 ... Axis 28 ... Valve body 30a, 30b, 30c ... Fluid port 32 ... Low pressure Pipe 34 ... Pipe 36 ... Pipe 38 ... High-pressure pipe 40 ... Bracket 42 ... Piston 44 ... Piston 46 ... Recess 48 ... Pilot valve housing 50 ... Valve seat 52 ... Axis 54 ... Valve element 56 ... Solenoid tube 57 ... End cap 58 ... Solenoid Coil 60a, 60b, 60c ... Fluid port 62 ... Low pressure capillary 64 ... Narrow tube 66 ... Narrow tube 68 ... High pressure capillary 70 ... Fixed iron core 72 ... Movable iron core 74 ... Energizing spring 76 ... Valve element holder 78 ... Control means 80 ... Recess 82 ... Valve seat 84 ... Valve bodies 86a, 86b, 86c ... Fluid port 88 ... Recess 90 ... Valve seat 92 ... Valve bodies 94a, 94b, 94c Fluid ports 96 ... valve seat 98 ... valve body 100a, 100b, 100c, 100d, 100e ... fluid port 102 ... valve seat 104 ... valve body 106a, 106b, 106c, 106d, 106e ... fluid port

Claims (9)

A valve housing comprising a valve seat having an axial line and having a plurality of fluid ports aligned in the axial direction;
A valve body that slides on the valve seat in the axial direction and has a recess formed on a sliding surface that selectively communicates two adjacent fluid ports on the valve seat, the valve body comprising: In the switching valve that is stopped at one of the predetermined extreme position and the other predetermined extreme position,
The axial length of the concave portion of the valve body is greater than the axial distance between the axially outermost edges of the two adjacent fluid ports, and both extreme positions of the valve body are Is stopped at one of the extreme positions and the two fluid ports are covered with the recess, the other extreme position side of the fluid port on the other extreme position side of the two fluid ports A switching valve that is defined so as to define a margin region in the recess that is larger than one of the extreme positions of one of the two fluid ports.   The switching valve is a main valve of a four-way switching valve that is connected to a fluid circuit and switches a flow path of the fluid circuit. The main valve has three fluid ports in the valve seat and is added to the valve housing. The switching valve according to claim 1, further comprising a port.   The switching valve is a pilot valve for operating a main valve of a four-way switching valve that is connected to a fluid circuit and switches a flow path of the fluid circuit, and the pilot valve has three fluid ports in the valve seat. The switching valve according to claim 2, further comprising an additional port in the valve housing.   The switching valve is a pilot valve for operating a main valve of a four-way switching valve that is connected to a fluid circuit and switches a flow path of the fluid circuit, and the pilot valve has three fluid ports in the valve seat. The switching valve according to claim 1, further comprising an additional port in the valve housing. A valve housing comprising a valve seat having an axial line and having a plurality of fluid ports aligned in the axial direction;
A valve body that slides on the valve seat in the axial direction and has a recess formed on a sliding surface that selectively communicates two adjacent fluid ports on the valve seat, the valve body comprising: In the switching valve that is stopped at one of the predetermined extreme position and the other predetermined extreme position,
The switching valve in which the plurality of fluid ports are provided on the valve seat in a staggered arrangement in the axial direction.   The switching valve is a main valve of a four-way switching valve that is connected to a fluid circuit and switches a flow path of the fluid circuit. The main valve has three fluid ports in the valve seat and is added to the valve housing. The switching valve according to claim 5, further comprising a port.   The switching valve is a pilot valve for operating a main valve of a four-way switching valve that is connected to a fluid circuit and switches a flow path of the fluid circuit, and the pilot valve has three fluid ports in the valve seat. The switching valve according to claim 6, further comprising an additional port in the valve housing.   The switching valve is a pilot valve for operating a main valve of a four-way switching valve that is connected to a fluid circuit and switches a flow path of the fluid circuit, and the pilot valve has three fluid ports in the valve seat. 6. The switching valve according to claim 5, further comprising an additional port in the valve housing.   The axial length of the concave portion of the valve body is greater than the axial distance between the axially outermost edges of the two adjacent fluid ports, and both extreme positions of the valve body are Is stopped at one of the extreme positions and the two fluid ports are covered with the recess, the other extreme position side of the fluid port on the other extreme position side of the two fluid ports The switching valve according to claim 5, wherein the switching valve is defined so as to define a margin area in the recess that is larger than one extreme position side of one of the two fluid ports.

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