WO2020129458A1

WO2020129458A1 - Flow path switch valve

Info

Publication number: WO2020129458A1
Application number: PCT/JP2019/043937
Authority: WO
Inventors: 木船　仁志; 紀幸森田
Original assignee: 株式会社不二工機
Priority date: 2018-12-20
Filing date: 2019-11-08
Publication date: 2020-06-25
Also published as: JP2020101208A

Abstract

Provided is a flow path switch valve with which a flow path can be switched smoothly without setting the position of a seal surface of a slide valve body or a valve seat surface of a valve seat block near a center line (axis line) of a housing when, for example, the diameter of the housing is increased. A connecting body (10) in a four-way switch valve (flow path switch valve) (1) is configured from a single plate arranged parallel to a valve seat surface (82) of a valve seat member (81) on an axis line (center line) (O) of a housing (80), and is provided with a deformation section (14), which is deformed toward a seal surface (92) side of a slide valve body (90). The slide valve body (90) is pressed via this deformation section (14) in conjunction with reciprocal movement of two pistons (84A, 84B).

Description

Flow path switching valve

The present invention relates to a slide type flow path switching valve in which a slide valve body is arranged in a cylinder type housing, and in particular, a connecting body for connecting two pistons provided in the housing so as to be integrally movable. The present invention relates to a flow path switching valve that pushes a slide valve body with the reciprocating movement of two pistons.

Conventionally, flow path switching valves such as a slide type four-way switching valve and a six-way switching valve in which a slide valve body is arranged in a cylinder type housing are well known. Further, it is also known to use, in this slide type flow path switching valve, a connecting body made of SUS or the like in the shape of a rectangular plate by press working or the like in order to move (slide) the slide valve body (for example, , The following Patent Document 1).

FIG. 6A shows a conventional flow path switching valve. The flow path switching valve of the illustrated conventional example is a slide type four-way switching valve 101 used for flow path switching in a heat pump type cooling and heating system, for example, a cylinder type housing 80, and a valve seat provided in the housing 80. The member 81, the port pC, the port pS (low pressure port), and the port pE, which are opened in the valve seat surface 82 formed on the upper surface of the valve seat member 81 and are provided side by side in the left-right direction, and the valve seat surface 82. A slide valve body 90 having an inverted bowl shape in cross section is provided so as to be slidable on the left and right.

The slide valve body 90 has a sealing surface 92 that contacts the valve seat surface 82. In the slide valve body 90, in order to selectively communicate the three ports pC, pS, and pE, in other words, a first state in which the ports pS and pE are in communication, and a port pS and a port pC are provided. A U-turn communication path 95 is provided to create the second state of communication.

Lid members

87A and 87B are airtightly fixed to both ends of the housing 80, and the inside of the housing 80 is airtightly partitioned by two

packing pistons

84A and 84B on the left and right to form a valve chamber 83 and two working chambers. 86A and 86B are defined. A port pD (high pressure port) connected to the discharge side of the compressor is opened in the valve chamber 83.

The two

pistons

84A and 84B are connected by a horizontally elongated rectangular plate-shaped connecting body 110 so that they can move integrally. The connection body 110 is formed with an opening 112 into which the slide valve body 90 is slidably fitted from below. The slide valve body 90 is pushed by the opening 112 portion of the coupling body 110 as the two

pistons

84A and 84B reciprocate, and the port pE and the port pS are connected to each other via the U-turn communication passage 95 formed therein. Is slid between a right end position (first state) for communicating with each other and a left end position (second state) for communicating with port pC and port pS. Note that FIG. 6A shows the second state.

Further, the connecting body 110 has circular openings 115 formed on the left and right of the opening 112.

The two

working chambers

86A and 86B are selectively connected to the compressor discharge side and the compressor suction side via a four-way pilot valve (not shown in FIG. 6A, shown in FIG. 1), and the two working chambers 86A are connected to each other. , 86B are used to move the

pistons

84A and 84B, and the slide valve body 90 is slid on the valve seat surface 82 accordingly to switch the flow paths.

In such a flow path switching valve, when performing flow path switching (that is, position switching of the slide valve body), it is necessary to move the slide valve body by pressing a predetermined position of the slide valve body with a connecting body. However, if the predetermined position of the pressing portion is too far from the sealing surface of the slide valve body (sliding surface of the valve seat member with the valve seat surface), the stick-slip phenomenon easily occurs and abnormal noise is generated, and the slide The sealing surface of the valve body is easily worn. Therefore, the predetermined position of the pressing portion needs to be as close as possible to the sealing surface of the slide valve body.

JP, 2010-38320, A

However, recently, a flow rate switching valve with a large flow rate has been demanded, and it has been considered to increase the housing diameter (inner diameter of the housing) in order to secure the flow channel in the housing. In view of the balance of the forces acting on each component, the connecting body that pushes the slide valve body is arranged near the center line (axis) of the housing (see Patent Document 1 and FIG. 6A), but as described above, The connecting body needs to push the slide valve body at a position as close as possible to the sealing surface, and as a result, the position of the valve seat surface of the valve seat member needs to be brought close to the center line (axis) of the housing (see FIG. 6B). ). Therefore, even if the housing diameter is increased, the volume occupied by the valve seat member in the housing becomes large, and the effect of increasing the flow rate is not commensurate with the increase in body size. Further, it is difficult to secure the height of the flow path between the housing (the inner wall of the housing) and the slide valve body, and from this point, the effect of increasing the flow rate cannot be sufficiently obtained.

The present invention has been made in view of the above circumstances, and an object of the present invention is to set the position of the seal surface of the slide valve body or the valve seat surface of the valve seat block at the center of the housing when the housing diameter is increased, for example. It is an object of the present invention to provide a flow passage switching valve that can smoothly perform flow passage switching without disposing it near a line (axis).

In order to achieve the above object, a flow path switching valve according to the present invention is basically a cylinder type housing having a valve chamber defined by a pair of pistons and having a port opened, and the inside of the housing. A valve seat member provided in the valve seat member, a plurality of ports formed in the valve seat member and opened in the valve seat surface, and disposed on the valve seat surface so as to be slidable in the axial direction, A slide valve body having a sealing surface that faces the surface and provided with a communication passage that selectively communicates the plurality of ports, and the pair of pistons are integrally movably connected to each other to reciprocate the pair of pistons. And a connecting body that pushes the slide valve body together, and the connecting body is composed of a single plate member that is arranged parallel to the valve seat surface of the valve seat member on the axis of the housing. At the same time, in order to push the slide valve body with the reciprocating movement of the pair of pistons, a deforming portion is provided which is deformed toward the sealing surface side of the slide valve body.

In a preferred aspect, the connecting body is provided with an opening into which the slide valve body is fitted, and the deforming portion is provided at an end edge portion in the axial direction of the opening.

In another preferred aspect, the surface of the deformable portion is brought into sliding contact with the slide valve body.

In another preferred aspect, the end surface of the deformable portion is brought into sliding contact with the slide valve body.

In a further preferred aspect, the tip of the deformable portion is formed parallel to the valve seat surface of the valve seat member.

In another preferred aspect, the deformable portion has an inclined portion that is inclined with respect to the valve seat surface of the valve seat member.

The connecting body in the flow path switching valve according to the present invention is composed of a single plate member arranged parallel to the valve seat surface of the valve seat member on the axis (center line) of the housing, and seals the slide valve body. A deformable portion that is deformed toward the surface side is provided, and the slide valve body is pushed through the deformable portion (that is, the deformable portion contacts the slide valve body) as the pair of pistons reciprocates. It is supposed to move.

In this case, since it is possible to push the position close to the seal surface of the slide valve body through the deforming portion while the connecting body is arranged parallel to the valve seat surface of the valve seat member on the axis (center line) of the housing, For example, even when the housing diameter is increased, it is not necessary to position the valve seat surface of the valve seat member near the center line (axis) of the housing. In other words, the position of the valve seat surface of the valve seat member can be kept low. Therefore, the volume occupied by the valve seat member in the housing is small, and the flow passage height between the housing (inner wall) and the slide valve body can be easily secured, so that the effect of increasing the flow rate can be sufficiently obtained. be able to.

Therefore, for example, in the case where the housing diameter is increased as compared with the conventional one in which the connecting body is made of a plate material arranged in parallel with the valve seat surface of the valve seat member on the axis (center line) of the housing, , Smooth passage switching (that is, movement of the slide valve body) without arranging the seal surface of the slide valve body or the valve seat surface of the valve seat member near the center line (axis) of the housing. You can

1 is an overall vertical sectional view showing an embodiment of a flow path switching valve according to the present invention. The perspective view of the connection body shown by FIG. The principal part expanded longitudinal cross-sectional view which shows the other example (the 1) of the connection body shown by FIG. The principal part expanded longitudinal cross-sectional view which shows the other example (the 2) of the connection body shown by FIG. The principal part expanded longitudinal cross-sectional view which shows the other example (the 3) of the connection body shown by FIG. FIG. 6 is a vertical cross-sectional view showing a conventional flow path switching valve. FIG. 6 is a vertical cross-sectional view provided for explaining a problem of a conventional flow path switching valve.

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

FIG. 1 is an overall vertical sectional view showing an embodiment of a flow path switching valve according to the present invention. FIG. 2 is a perspective view of the connector shown in FIG.

It should be noted that, in the present specification, descriptions indicating positions and directions such as up and down, left and right, and front and back are added for convenience according to the drawings in order to avoid complicated description, and are actually incorporated in an air conditioning system or the like. It does not necessarily indicate the position and direction in the state.

In addition, in each drawing, the gaps formed between the members and the separation distances between the members are larger than the dimensions of each constituent member in order to facilitate understanding of the invention and for convenience in drawing. Or it may be drawn small.

The flow path switching valve of the illustrated embodiment is, for example, a slide type four-way switching valve 1 used for flow path switching in a heat pump type cooling and heating system, and includes a main valve 72 having a slide valve body 90 built therein and a four-way pilot valve 8. With.

The main valve 72 opens into a cylinder type (cylindrical) housing 80, a valve seat member 81 provided in the housing 80, and a flat and smooth valve seat surface 82 formed on the upper surface of the valve seat member 81. , Port pC, port pS (low pressure port), and port pE provided side by side in the left-right direction (length of housing 80 or direction of axis O), and on the valve seat surface 82 slidably arranged in the left-right direction. It has a slide valve body 90 having an inverted bowl shape in cross section.

Lid members

87A and 87B are airtightly fixed to both ends of the housing 80, and the inside of the housing 80 is airtightly partitioned by two left and right (paired) packing

pistons

84A and 84B, and a valve chamber 83, Two working

chambers

86A and 86B are defined. A port pD (high pressure port) connected to the discharge side of the compressor is opened in the valve chamber 83 (a position facing the central port pS in the illustrated example).

The two

pistons

84A and 84B are connected by the horizontally elongated rectangular plate-shaped connecting body 10 so as to be integrally movable. The connecting body 10 has a rectangular opening 12 into which the slide valve body 90 is slidably fitted from below. The slide valve body 90 is pushed by the opening 12 portion of the coupling body 10 as the two

pistons

84A and 84B reciprocate, and the port pE and the port pS (via the U-turn communication passage 95 formed therein). It slides between a right end position (first state) communicating with the low pressure port) and a left end position (second state) communicating with the port pC and the port pS (low pressure port). .. Note that FIG. 1 shows the second state.

More specifically, the coupling body 10 of the present embodiment is configured by a horizontally long (longer in the left-right direction) rectangular plate material (single member) manufactured by pressing or the like using SUS or the like as a material. .. The connecting body 10 is basically arranged (in a portion other than a mounting leg portion 11 and a deforming portion 14 which will be described later) in parallel with the valve seat surface 82 of the valve seat member 81 on the center line (axis O) of the housing 80. ing. At the left and right ends of the connecting body 10, there are provided mounting leg portions 11 that are formed by bending them in a front-rear direction upside down and have through holes (screw holes) through which the bolts 85 pass. The connection body 10 is connected to the two

pistons

84A and 84B by fastening and fixing the mounting leg portions 11 to the

pistons

84A and 84B with bolts 85. Needless to say, the mounting (coupling) configuration of the two

pistons

84A and 84B and the coupling body 10 is not limited to the illustrated example.

In addition, in the present embodiment, the left and right (axis O direction) edge portions of the opening 12 provided in the substantially central portion of the coupling body 10 are downward (in other words, the seal of the valve body 90) via the curved portion 13. It is deformed (folded or bent) so as to fall (substantially vertically toward the surface 92 side) (deformation portion 14). The surface of each deforming portion 14 (specifically, the surface facing inward by being bent or bent) is slidably brought into contact with (the outer surface of) the valve body 90 fitted into the opening 12. There is.

Therefore, in the present embodiment, the slide valve body 90 is pushed by the deforming portion 14 formed in (the end edge portion of) the opening 12 of the connecting body 10 as the two

pistons

84A and 84B reciprocate, It slides between the right end position (first state) and the left end position (second state).

A circular opening 15 is formed in the connecting body 10 on the left and right sides of the opening 12, that is, at a position substantially right above the port C on the left side when the valve body 90 takes the right end position (first state). At the same time, the circular opening 15 is formed in a portion located right above the port E on the right side when the valve body 90 takes the left end position (second state).

In the main valve 72, the two working

chambers

86A and 86B are selectively connected to the compressor discharge side and the compressor suction side through the four-way pilot valve 8 and the thin tubes #1 to #4, and the two working chambers are operated. The pressure difference between the

chambers

86A and 86B is used to move the

pistons

84A and 84B, and accordingly, the slide valve body 90 is slid on the valve seat surface 82 (via the deformation portion 14) to switch the flow paths. Is to do.

As described above, the connecting body 10 in the four-way switching valve (flow path switching valve) 1 of the present embodiment is arranged parallel to the valve seat surface 82 of the valve seat member 81 on the axis (center line) O of the housing 80. A deformable portion 14 that is configured by a single plate material and that is deformed toward the sealing surface 92 side of the slide valve body 90 is provided, and via this deformable portion 14 (that is, the deformable portion 14 is a slide valve). The slide valve body 90 is pushed along with the reciprocating movement of the two

pistons

84A and 84B (in contact with the body 90).

In this case, the coupling body 10 is arranged parallel to the valve seat surface 82 of the valve seat member 81 on the axis (center line) O of the housing 80, and is close to the sealing surface 92 of the slide valve body 90 via the deformable portion 14. Since the position can be pushed, it is not necessary to bring the position of the valve seat surface 82 of the valve seat member 81 near the center line (axis) O of the housing 80 even when the housing diameter is increased. In other words, the position of the valve seat surface 82 of the valve seat member 81 can be kept low. Therefore, the volume occupied by the valve seat member 81 in the housing 80 can be small, and the height of the flow path between the housing 80 (the inner wall thereof) and the slide valve body 90 can be easily ensured to increase the flow rate. Can be fully obtained.

Therefore, for example, in the case where the housing diameter is increased as compared with the conventional one in which the connecting body is made of a plate material arranged in parallel with the valve seat surface of the valve seat member on the axis (center line) of the housing, Even if the positions of the seal surface 92 of the slide valve body 90 and the valve seat surface 82 of the valve seat member 81 are not arranged near the center line (axis) O of the housing 80, the flow passage can be smoothly switched (that is, the slide valve body). 90 movements) can be performed.

In the illustrated example, the deformable portion 14 is provided over the entire length (in the front-rear direction) of the edge portion of the opening 12 of the coupling body 10, but the deformation portion 14 is provided only at a part of the edge portion of the opening 12 of the coupling body 10. The deformed portion 14 may be formed.

The shape of the deformable portion 14 of the connecting body 10 is not limited to the example shown in the figure as long as the position close to the sealing surface 92 of the valve body 90 can be pushed as the

pistons

84A and 84B reciprocate. ..

For example, as shown in FIG. 3, the distal end portion (inner end portion) of the deformable portion 14 is formed parallel to the valve seat surface 82 of the valve seat member 81 (in other words, the flat plate portion of the connecting body 10), and The end surface 14a of the deformable portion 14 may be brought into sliding contact (contact) with (the outer surface of) the valve body 90. When the end face 14a is formed by die-cutting after bending the deformable portion 14 when the connecting body 10 is manufactured by press molding, the end face 14a can be accurately positioned, so that the desired position on the valve body 90 is pushed. be able to.

Further, as shown in FIG. 4, the deformable portion 14 may be formed to be inclined with respect to the valve seat surface 82 of the valve seat member 81 (in other words, the flat plate portion of the connector 10). In other words, the deformable portion 14 may be configured by an inclined portion that is formed to be inclined with respect to the valve seat surface 82 of the valve seat member 81. In this case, since the amount of deformation of the deformable portion 14 (with respect to the flat plate portion of the coupling body 10) can be suppressed, the deformable portion 14 can be easily processed/molded.

Further, as shown in FIG. 5, a portion formed by inclining the deformable portion 14 with respect to the valve seat surface 82 of the valve seat member 81 (in other words, the flat plate portion of the connecting body 10) and the valve seat. The member 81 may be configured so as to fall substantially perpendicular to the valve seat surface 82. In other words, in the example shown in FIG. 4, even if the tip of the deforming portion (sloping portion) 14 is formed perpendicularly to the valve seat surface 82 of the valve seat member 81 (in other words, the flat plate portion of the connecting body 10). Good. In this case, in the example shown in FIG. 4, it becomes easy to secure a sliding contact (contact) area with the valve body 90.

In the above embodiment, a four-way switching valve was described as an example of the flow path switching valve, but the present invention is a two-way valve that switches the flow path by a slide valve body, a three-way switching valve, or a five-way switching valve or more. Of course, it can be applied to a multi-way switching valve.

1 4-way switching valve (flow path switching valve)
8 Four-way pilot valve 10 Connecting body 11 Mounting leg 12 Opening 13 Curved part 14 Deformation part 15 Circular opening 72 Main valve 80 Housing 81 Valve seat member 82 Valve seat surface 83

Valve chamber

84A, 84B Piston 85

Bolt

86A,

86B Working chamber

87A , 87B Lid member 90 Slide valve body 92 Sealing surface 95 U-turn communication passage

Claims

A cylinder type housing having a valve chamber defined by a pair of pistons and having a port opened, a valve seat member provided in the housing, and a valve seat surface formed in the valve seat member. A plurality of ports and a communication passage that is slidably arranged on the valve seat surface in the axial direction and has a seal surface that is in contact with the valve seat surface and that selectively communicates the plurality of ports. A flow path switching valve, comprising: a slide valve body provided; and a coupling body that integrally movably couples the pair of pistons and pushes the slide valve body with the reciprocating movement of the pair of pistons. hand,
The connecting body is composed of a single plate member arranged in parallel with the valve seat surface of the valve seat member on the axis of the housing, and the slide valve body is moved along with the reciprocating movement of the pair of pistons. The flow path switching valve is characterized in that a deformation portion is provided which is deformed toward the sealing surface side of the slide valve body so as to be pushed.
The flow path according to claim 1, wherein the connection body is provided with an opening into which the slide valve body is fitted, and the deformation portion is provided at an end edge portion in the axial direction of the opening. Switching valve.
The flow path switching valve according to claim 1 or 2, wherein a surface of the deformable portion is configured to be in sliding contact with the slide valve body.
The flow path switching valve according to claim 1 or 2, wherein an end surface of the deformed portion is configured to be in sliding contact with the slide valve body.
The flow path switching valve according to claim 4, wherein a tip portion of the deformable portion is formed parallel to a valve seat surface of the valve seat member.
The flow path switching valve according to any one of claims 1 to 5, wherein the deforming portion has an inclined portion that is inclined with respect to the valve seat surface of the valve seat member.