CN117366277A

CN117366277A - Sliding type switching valve and refrigeration cycle system using the same

Info

Publication number: CN117366277A
Application number: CN202310772537.9A
Authority: CN
Inventors: 滨田正吾; 村田雅弘; 铃木毅敏; 三留陵; 剑持大一郎; 渡边秀刚; 冈田聪
Original assignee: Saginomiya Seisakusho Inc
Current assignee: Saginomiya Seisakusho Inc
Priority date: 2022-07-08
Filing date: 2023-06-28
Publication date: 2024-01-09
Also published as: JP2024008626A

Abstract

The invention provides a sliding type switching valve capable of reducing the stroke length of a sliding valve core and inhibiting generation of burrs and a refrigeration cycle system using the sliding type switching valve. In a sliding type switching valve (100), a valve seat part (20A) is provided with a valve seat main body (21A) and a sheet member (25A) which is joined to the valve seat main body (21A) and is formed of a thin plate for sliding a sliding valve body (40), a valve seat flow path (20 RA) for fluid communication between joint pipes (1C, 1E, 1S) and a valve seat surface is formed in the valve seat part (20A), the outline of the valve seat flow path (20 RA) when seen from the vertical direction of the valve seat surface is set to be non-intersecting, and an offset region having a larger flow path area than one end side and the other end side of the valve seat flow path (RA) is provided in the valve seat flow path (RA) when seen from the vertical direction of the valve seat surface.

Description

Sliding type switching valve and refrigeration cycle system using the same

Technical Field

The present invention relates to a sliding type switching valve having a valve seat portion including a sheet member and a valve seat main body, and a refrigeration cycle system using the sliding type switching valve.

Background

In the sliding type switching valve, if the stroke length of the sliding valve body with respect to the valve seat portion is large at the time of switching of the fluid path, there is a problem (hereinafter, referred to as "first problem point of the related art (large stroke length of the sliding valve body)") that increases power consumption for driving the sliding valve body, decreases responsiveness, and the like.

For this reason, for example, patent document 1 (see fig. 8-1 in particular) describes the following: in order to solve the first conventional problem (the large stroke length of the sliding valve body), the conventional sliding type switching valve (hereinafter referred to as "conventional sliding type switching valve") is provided with a valve seat portion 41, wherein the valve seat portion 41 has three capillaries 411 to 413 cut from the upper surface side and three small diameter valve holes cut from the lower surface side so as to communicate with the capillaries 411 to 413, and the small diameter valve holes on both sides of the three small diameter valve holes opened on the valve seat surface (the lower surface in fig. 8-1) of the valve seat portion 41 are arranged so as to be close to the small diameter valve hole in the center.

Prior art literature

Patent literature

Patent document 1: chinese patent application publication No. 105570490

Disclosure of Invention

Problems to be solved by the invention

In this way, in the conventional sliding type switching valve, in order to narrow the intervals between the three small-diameter valve holes opened in the valve seat surface, it is necessary to intersect the outlines of the capillaries 411 and 413 and the two small-diameter valve holes. Burrs are generated at the intersections in the valve seat flow paths, but since the valve seat flow paths are extremely narrow in width, it is extremely difficult to completely remove the burrs. Therefore, if the burrs left in the valve seat flow path after incomplete removal are removed for some reason, the burrs are embedded between the slide valve body and the valve seat surface, and as a result, there is a concern that defects such as a decrease in sealability and an increase in sliding resistance of the slide valve body occur (hereinafter, referred to as "second problem point in the related art (burr generation in the valve seat flow path)").

The present invention has been made in view of the above problems, and an object of the present invention is to provide a sliding type switching valve that can solve the conventional first and second problems, reduce the stroke length of a sliding valve body, and suppress the generation of burrs by employing a valve seat portion that separates a sheet member from a valve seat main body, and studying the contour of a valve seat flow path formed in the valve seat portion, and a refrigeration cycle system using the sliding type switching valve.

Means for solving the problems

In order to solve the above problems, a sliding type switching valve is provided, which comprises: a valve body having a bottomed cylindrical shape; a valve seat portion fixed to a peripheral wall of the valve main body; a plunger slidable in an axial direction in the valve main body; and a slide valve body coupled to the plunger and configured to switch a state of connection to a valve seat surface of the valve seat portion by moving the valve body in an axial direction, wherein the valve seat portion includes a valve seat body having at least one joint pipe insertion hole to which a joint pipe is connected, and a sheet member composed of a thin plate that is joined to the valve seat body and slides the slide valve body, a valve seat passage that fluidly connects the joint pipe and the valve seat surface is formed in at least one of the sheet member and the valve seat body, a contour of the valve seat passage when viewed from a vertical direction of the valve seat surface does not intersect in each member that forms the valve seat passage, and a displacement region having a larger passage area than one end side and the other end side of the valve seat passage is provided in the valve seat passage when viewed from the vertical direction of the valve seat surface.

In the sliding type switching valve, it is preferable that the joint pipe insertion hole connected to the offset region is arranged so as to be separated from the axis in a direction perpendicular to the valve seat surface when viewed from the vertical direction.

In the sliding type switching valve, it is preferable that the valve seat flow path of either one of the valve seat main body and the sheet member is provided with a stepped hole having a different diameter, the stepped hole being composed of a straight through hole and a stepped portion which is the offset region, includes the through hole when viewed in a vertical direction of the valve seat surface, and has a larger contour than the through hole.

In the sliding type switching valve, it is preferable that the sheet member is formed by stacking a plurality of sheet members, and the valve seat flow path formed in each of the plurality of sheet members is formed by a straight through hole.

In the sliding type switching valve, it is preferable that a positioning mechanism is provided so that the valve seat main body and the sheet member engage with each other.

In the sliding type switching valve, it is preferable that the valve seat body is formed of a thin plate, and the valve seat flow path is not formed.

In the sliding type switching valve, it is preferable that the shape of the valve seat flow path in the valve seat surface of the sheet member is set so that a width in a direction orthogonal to the axis is equal to or greater than a width in the axis direction.

In the sliding type switching valve, it is preferable that a plurality of the valve seat flow paths in the valve seat surface of the sheet member are arranged in parallel in the axial direction in a state of being offset in a direction orthogonal to the axial line when viewed from the vertical direction of the valve seat surface.

In addition, in the sliding type switching valve, a direct-acting electromagnetic spool valve is preferable.

In the refrigeration cycle, the compressor, the condenser, the expansion valve, the evaporator, and the pilot-type four-way switching valve are preferably included, and the sliding-type switching valve is preferably used as a pilot valve of the pilot-type four-way switching valve.

The effects of the invention are as follows.

According to the present invention, it is possible to provide a sliding type switching valve and a refrigeration cycle system using the same, in which a seat portion that separates a sheet member from a valve seat main body is used, and the profile of a valve seat flow path formed in the valve seat portion is studied, so that it is possible to solve the conventional first and second problems, reduce the stroke length of a sliding valve body, and suppress the generation of burrs.

Drawings

Fig. 1 is a cross-sectional view of a pilot-operated four-way switching valve of the present invention.

Fig. 2 is a diagram showing the refrigeration cycle system of the present invention.

Fig. 3 is a cross-sectional view showing a coil non-energized state of the sliding type switching valve according to the first embodiment of the present invention.

Fig. 4 is a partial enlarged view of the sliding type switching valve according to the first embodiment 1-1, (a) is an overall view of the valve seat portion and the sliding valve body, (b) is a sectional view taken along the line IVb-IVb of (a), and (c) is a sectional view taken along the line IVc-IVc of (a).

Fig. 5 is a detailed view showing the valve seat portion shown in fig. 4, (a) shows a plan view of the sheet member, (b) shows a cross-sectional view along a line Vb-Vb of (a), (c) shows a bottom view of the sheet member, (d) shows a plan view of the valve seat body, (e) shows a cross-sectional view along a line Ve-Ve of (d), and (f) shows a bottom view of the valve seat body.

Fig. 6 is a partial enlarged view of the sliding type switching valve according to the first embodiment 1-2, in which (a) is an overall view of the valve seat portion and the sliding valve body, and (b) is a sectional view taken along line VIb-VIb of (a).

Fig. 7 is a detailed view showing the valve seat portion shown in fig. 6, (a) shows a plan view of the sheet member, (b) shows a cross-sectional view taken along the line VIIb-VIIb of (a), (c) shows a bottom view of the sheet member, (d) shows a plan view of the valve seat body, (e) shows a cross-sectional view taken along the line VIIe-VIIe of (d), and (f) shows a bottom view of the valve seat body.

Fig. 8 is a partial enlarged view of the sliding type switching valve according to the first embodiment 1 to 3, in which (a) is an overall view of the valve seat portion and the sliding valve body, and (b) is a sectional view taken along the line VIIIb-VIIIb of (a).

Fig. 9 is a detailed view showing the valve seat portion shown in fig. 8, (a) shows a plan view of the sheet member, (b) shows a cross-sectional view along the line IXb-IXb of (a), (c) shows a bottom view of the sheet member, (d) shows a plan view of the valve seat body, (e) shows a cross-sectional view along the line IXe-IXe of (d), and (f) shows a bottom view of the valve seat body.

Fig. 10 is a partial enlarged view of the sliding type switching valve according to the first embodiment 1 to 4, in which (a) is an overall view of the valve seat portion and the sliding valve body, and (b) is a sectional view taken along the line xb—xb of (a).

Fig. 11 is a detailed view showing the valve seat portion shown in fig. 10, (a) shows a plan view of the sheet member, (b) shows a cross-sectional view taken along line XIb-XIb of (a), (c) shows a bottom view of the sheet member, (d) shows a plan view of the valve seat body, (e) shows a cross-sectional view taken along line XIe-XIe of (d), and (f) shows a bottom view of the valve seat body.

Fig. 12 is an enlarged partial view of the sliding type switching valve according to the first embodiment 1 to 5, in which (a) is an overall view of the valve seat portion and the sliding valve body, and (b) is a sectional view taken along line xiib—xiib of (a).

Fig. 13 is a detailed view showing the valve seat portion shown in fig. 12, (a) shows a top view of a plurality of sheet members, (b) shows a cross-sectional view taken along line XIIIb-XIIIb of (a), (c) shows a bottom view of a plurality of sheet members, (d) shows a top view of a valve seat body, (e) shows a cross-sectional view taken along line XIIIe-XIIIe of (d), and (f) shows a bottom view of the valve seat body.

Fig. 14 is a cross-sectional view showing a coil non-energized state of a sliding type switching valve according to a second embodiment of the present invention.

Fig. 15 is a partial enlarged view of a sliding type switching valve according to a second embodiment 2-1, in which (a) is an overall view of a valve seat portion and a sliding valve body, (b) is a cross-sectional view taken along the line XVb-XVb of (a), and (c) is a cross-sectional view taken along the line XVc-XVc of (a).

Fig. 16 is a detailed view showing the valve seat portion shown in fig. 15, in which (a), (c), (e), and (g) show cross-sectional views of the valve seat portion, (b), (d), (f), and (h) show plan views of the valve seat portion, and (a) to (b) show the valve seat portion, (c) to (d) show first sheet members, (e) to (f) show second sheet members, and (g) to (h) show valve seat bodies.

Fig. 17 is a plan view showing various forms of the first sheet member corresponding to (d) of fig. 16, (a) shows form 2-2 (aligned elliptical holes), (b) shows form 2-3 (aligned circular holes), (c) shows form 2-4 (aligned elliptical holes and a pair of triangular holes), (d) shows form 2-5 (circular holes and an offset pair of elliptical holes), and (e) shows form 2-6 (aligned quadrangular holes).

In the figure:

1-refrigeration cycle, 1C-C joint pipe, 1D-D joint pipe, 1E-E joint pipe, 1S-S joint pipe, 10-pilot valve body (valve body), 10A ', 10B-valve seat mounting hole, 14-protrusion, 20A, 20B, 20C, 20D, 20E, 20' -valve seat portion, 20DA, 20DB, 20DC, 20 DD-stepped hole, 20IA, 20IB, 20IC, 20ID, 20 IE-joint pipe insertion region, 20RA, 20RB, 20RC, 20RD, 20 RE-valve seat flow path, 21, 21A ', 21B, 21D, 21' -valve seat body, 21Cd 1-2, 21Ed 1-2, 21Sd 1-2-stepped portion, 21Ci 1-2, 21Ei 1-2, 21Si 1-2, 21Ci4, 21Ei4, 21Si4, 21Ci ', 21Ei', 21Si '-fitting tube insertion hole, 21Cs 1-2, 21Es 1-2, 21Ss 1-2, 21Cs4, 21Es4, 21Ss 4-straight through hole, 21 p-alignment protrusion, 21 w-alignment wall, 25, 25A', 25D-sheet members, 25Cd4, 25Ed4, 25Sd 4-stepped portions, 25Cs1, 25Es1, 25Ss1, 25Cs4, 25Es4, 25Ss 4-straight through holes, 25g, 26g, 27 g-alignment grooves, 25 h-alignment holes, 26'-1 to 6-first sheet members (sheet members), 26Cs5, 26Es5, 26Ss5, 26Cs5', 26Es5', 26Ss5' -straight through holes, 27 '-second sheet members (sheet members), 27Cs5, 27Es5, 27Ss5, 27Cs5', 27Es5', 27Ss5' -straight through-holes, 30-plungers, 31-cylindrical portions, 32-front end faces, 33-opening edges, 34A, 34B-communicating passages, 34C-coil spring supporting portions, 34D-concave portions, 35-connecting rods, 35A-opening portions, 36-connecting pieces, 37-retainers, 40-slide valve cores, 40A-concave portions, 41-valve springs, 50-attraction pieces, 50A-female screw holes, 51-coil springs, 60-electromagnetic coil unit, 61-molded coil part, 62-housing, 62A-mounting hole, 63-lead, 64-small screw, 100A, 100B-slide switching valve, 200-pilot four-way switching valve, 300-compressor, 400-outdoor heat exchanger, 500-indoor heat exchanger, 600-throttle device (expansion valve), C-axis, ls-stroke length of slide valve core, R40A-concave region, S-filter, T1-coil non-energized state, T2-coil energized state.

Detailed Description

An embodiment of the present invention will be described in detail with reference to fig. 1 to 17. However, the present invention is not limited to the embodiment.

< related terms >

In the description of the present specification and claims, "left", "right", "upper", "lower" refer to directions shown in fig. 1 to 3, fig. 4 (a), fig. 6 (a), fig. 8 (a), fig. 10 (a), fig. 12 (a), fig. 14, and fig. 15 (a). In the description of the present specification and claims, the "straight through hole" means a hole in which the contour of the through hole does not change when viewed from the direction in which the through hole in the same member extends. In the description of the specification and claims, "intersecting" means a state in which two contours intersect, not a tangential state. In the description of the present specification and claims, the "different-diameter stepped hole" means a member that is constituted of a straight through hole and a stepped portion that includes the through hole and has a larger profile than the through hole when viewed from a direction in which the through hole extends in the same member, and the profile of the straight through hole and the profile of the stepped portion do not intersect each other when viewed in a direction in which the through hole extends. In the description of the present specification and claims, "one end side of the valve seat flow path" and "the other end side of the valve seat flow path" mean "the open end side of the valve seat surface of the valve seat flow path" and "the joint pipe end side of the valve seat flow path". In the description of the present specification and claims, the "offset region in the valve seat flow path" means the following region: the valve seat flow path has a larger flow path area than one end side and the other end side of the valve seat flow path when viewed from the vertical direction of the valve seat surface, and can be arranged in an offset manner. In the description of the present specification and claims, "m.o.p.d" means the highest difference in pressure between the inlet pressure and the outlet pressure of the valve among the pressures at the limit at which the valve can be safely and reliably operated.

< related to Pilot-operated four-way switching valve >)

The pilot-operated four-way switching valve 200 of the present invention will be described with reference to fig. 1. The pilot-operated four-way switching valve 200 mainly includes a valve housing 210, a pair of pistons 220A and 220B, a connecting plate 230, a switching valve seat 240, and a valve element 250. The respective configurations of the pilot-operated four-way switching valve 200 will be described in order. Here, the longitudinal axis X in the drawing is a central axis of the valve housing 210.

The valve housing 210 is composed of a cylindrical portion 211 having a cylindrical shape and a pair of cap portions 212A and 212B. Both ends of the cylindrical portion 211 are closed by a pair of caps 212A and 212B, respectively. The pressure introduction pipe 3L and the pressure introduction pipe 3R are connected to the pair of caps 212A and 212B so that the slide type switching valve 100 is in fluid communication with the first working chamber 2A and the second working chamber 2B of the pilot type four-way switching valve 200, respectively, which will be described in detail below.

The pair of pistons 220A and 220B each include a leaf spring 221A and 221B, respectively, and are housed in the valve case 210 so as to be disposed opposite to each other. The pair of pistons 220A and 220B press the leaf springs 221A and 221B against the inner peripheral surface of the cylindrical portion 211, respectively, and are capable of reciprocating. Thereby, the interior of the valve housing 210 is partitioned by the pair of pistons 220A, 220B into the first working chamber 2A, the second working chamber 2B, and the high-pressure chamber 2C sandwiched by the first working chamber 2A and the second working chamber 2B.

The connecting plate 230 is formed of a metal plate extending along the longitudinal axis X, and includes a fitting hole 231 formed in the center and a pair of through holes 232A and 232B formed between the ends and the center. The connecting plate 230 has a pair of pistons 220A and 220B attached to both ends thereof, and a valve body 250 is held by a fitting hole 231 in the center.

The switching valve seat 240 is disposed below the center in the cylindrical portion 211. The switching valve seat 240 includes three through holes 241E, 241S, 241C aligned in a straight line along the longitudinal axis X, and the E-joint pipe 1E, S-joint pipe 1S, C-joint pipe 1C is attached to each of the through holes 241E, 241S, 241C via the cylindrical portion 211. A D-joint pipe 1D that opens in the cylindrical portion 211 is attached to the upper center of the cylindrical portion 211 facing the switching valve seat 240.

The valve body 250 includes a bowl-shaped recess 251, a pair of sliding portions 252A and 252B that sandwich the bowl-shaped recess 251, and a pin 253 that extends near an opening of the bowl-shaped recess 251 and is fixed to both side walls of the bowl-shaped recess 251 in the direction of an axis X, which is the longitudinal direction of the moving direction. The bowl-shaped recess 251 is in the shape of a bowl-shaped container inverted, and forms a space with the switching valve seat 240. The pair of sliding portions 252A and 252B slide against the switching valve seat 240 while bringing the lower surfaces into contact with each other.

Operation of Pilot four-way switching valve

In the pilot-type four-way switching valve 200, the suction pressure and the discharge pressure of the compressor 300 are selectively introduced into either the first working chamber 2A via the pressure introduction pipe 3L or the second working chamber 2B via the pressure introduction pipe 3R by the sliding-type switching valve 100 (see fig. 2). Thus, the pair of pistons 220A and 220B reciprocate along the longitudinal axis X, and the position of the valve body 250 with respect to the switching valve seat 240 is switched.

Specifically, when the pair of pistons 220A and 220B are moved to the left side along the longitudinal axis X, the S-joint pipe 1S and the E-joint pipe 1E communicate with each other via the bowl-shaped recess 251, and the D-joint pipe 1D and the C-joint pipe 1C communicate with each other via the high pressure chamber 2C and the through hole 232B by the valve body 250 and the switching valve seat 240. On the other hand, when the pair of pistons 220A and 220B are moved to the right side along the longitudinal axis X, the S-joint pipe 1S and the C-joint pipe 1C communicate via the bowl-shaped recess 251, and the D-joint pipe 1D and the E-joint pipe 1E communicate via the high pressure chamber 2C and the through hole 232A by the valve body 250 and the switching valve seat 240.

< about refrigeration cycle >)

The refrigeration cycle system 1 will be described with reference to fig. 2. The refrigeration cycle 1 is mainly composed of a slide type switching valve 100, a pilot type four-way switching valve 200, a compressor 300, an outdoor heat exchanger 400, an indoor heat exchanger 500, and a throttle device (expansion valve) 600.

In the pilot-type four-way switching valve 200, the S-joint pipe 1S is connected to the suction port of the compressor 300, and the D-joint pipe 1D is connected to the discharge port of the compressor 300. The C-joint pipe 1C is connected to the outdoor heat exchanger 400, and the E-joint pipe 1E is connected to the indoor heat exchanger 500. In addition, the outdoor heat exchanger 400 and the indoor heat exchanger 500 are connected to each other via the throttle device 600. Thus, the refrigeration cycle system 1 is configured by using a fluid path formed from the C-joint pipe 1C to the outdoor heat exchanger 400, the throttle device 600, the indoor heat exchanger 500, and the E-joint pipe 1E, and a fluid path formed from the S-joint pipe 1S to the compressor 300, and the D-joint pipe 1D. In addition, a small amount of refrigerating machine oil is contained in the refrigerant of the refrigeration cycle 1 in order to protect the compressor 300 and other devices.

As shown in fig. 2, the sliding type switching valve 100 is connected to a pilot type four-way switching valve 200. As shown in fig. 3, the sliding type switching valve 100 selectively introduces the suction pressure and the discharge pressure of the compressor 300 to either one of the first working chamber 2A through the pressure introduction pipe 3L and the second working chamber 2B through the pressure introduction pipe 3R by moving the slide valve body 40 by the solenoid unit 60. Thus, the pilot four-way switching valve 200 switches the fluid path of the refrigeration cycle system 1 by allowing the S-joint pipe 1S connected to the suction port of the compressor 300 and the D-joint pipe 1D connected to the discharge port of the compressor 300 to communicate with either one of the C-joint pipe 1C connected to the outdoor heat exchanger 400 and the E-joint pipe 1E connected to the indoor heat exchanger 500.

In this way, by using the sliding type switching valve 100 as a direct-acting electromagnetic spool as the pilot valve of the pilot-operated four-way switching valve 200, even when the pilot-operated four-way switching valve 200 has a large diameter, switching of the fluid path can be smoothly performed.

< action on refrigeration cycle >

First, during the cooling operation (see the solid arrow in fig. 2), the slide switching valve 100 turns the coil into a non-energized state, and switches the communication destination of the S-joint pipe 1S connected to the suction port of the compressor 300 to the first working chamber 2A via the pressure introduction pipe 3L of the pilot-operated four-way switching valve 200. At the same time, the communication destination of the D-joint pipe 1D connected to the discharge port of the compressor 300 is switched to the second working chamber 2B via the pressure introduction pipe 3R of the pilot-operated four-way switching valve 200. As a result, the pair of pistons 220A and 220B in the pilot-operated four-way switching valve 200 move to the left side by the pressure difference between the first working chamber 2A and the second working chamber 2B after the suction pressure and the discharge pressure are introduced into the compressor 300. As a result, the high-pressure refrigerant compressed by the compressor 300 flows from the D joint pipe 1D into the C joint pipe 1C through the high-pressure chamber 2C, flows into the outdoor heat exchanger 400, the throttle device 600, and the indoor heat exchanger 500 in this order, flows from the E joint pipe 1E into the S joint pipe 1S through the bowl-shaped concave portion 251, and circulates to the compressor 300. At this time, the outdoor heat exchanger 400 functions as a condenser (condenser), and the indoor heat exchanger 500 functions as an evaporator (evaporator).

Next, during the heating operation (see the broken line arrow in fig. 2), the slide type switching valve 100 sets the coil in the energized state, and switches the communication destination of the S-joint pipe 1S connected to the suction port of the compressor 300 to the second working chamber 2B via the pressure introduction pipe 3R of the pilot type four-way switching valve 200. At the same time, the communication destination of the D-joint pipe 1D connected to the discharge port of the compressor 300 is switched to the first working chamber 2A via the pressure introduction pipe 3L of the pilot-operated four-way switching valve 200. As a result, the pair of pistons 220A and 220B in the pilot-operated four-way switching valve 200 move to the right side by the pressure difference between the first working chamber 2A and the second working chamber 2B after the suction pressure and the discharge pressure are introduced into the compressor 300. As a result, the high-pressure refrigerant compressed by the compressor 300 flows from the D joint pipe 1D to the E joint pipe 1E through the high-pressure chamber 2C, flows into the indoor heat exchanger 500, the throttle device 600, and the outdoor heat exchanger 400 in this order, flows from the C joint pipe 1C to the S joint pipe 1S through the bowl-shaped concave portion 251, and circulates to the compressor 300. At this time, during the heating operation, the refrigerant circulates in the opposite direction to the cooling operation, and the indoor heat exchanger 500 functions as a condenser and the outdoor heat exchanger 400 functions as an evaporator.

(first embodiment)

< about sliding type switching valve >)

The sliding type switching valve 100A of the first embodiment will be described with reference to fig. 3. The sliding type switching valve 100A is mainly composed of a pilot valve body (valve body) 10, a valve seat portion 20, a plunger 30, a sliding valve body 40, a suction member 50, and a solenoid unit 60. The respective configurations of the sliding type switching valve 100A will be described in order. Here, the axis C in the figure is the central axis of the pilot valve body 10 and the plunger 30.

The pilot valve body 10 is formed by press working (deep drawing working) a stainless steel sheet, has a bottomed tubular shape, houses the valve seat portion 20 and the slide valve body 40 in the bottomed tubular portion, and houses the plunger 30 slidably in a tubular portion extending to the right in the axis C direction. The D joint pipe 1D is attached to the protruding portion 14 of the upper peripheral wall of the pilot valve body 10 by fitting, caulking, brazing, or the like in a state where the filter S is held. Further, a valve seat mounting hole 10A having a circular shape is formed in the lower side peripheral wall of the pilot valve body 10, and the valve seat portion 20 is joined by brazing through the valve seat mounting hole 10A. The shape of the valve seat mounting hole 10A in the present embodiment is one circular shape, but is not limited thereto, and any one of a rectangular shape, three circular shapes, a long circular shape, and the like may be used, for example.

The seat portion 20 includes a seat body 21 (21A) and a sheet member 25 (25A) fixed to the seat body 21 by caulking, brazing, or the like. The valve seat main body 21 is formed by forging, cutting, or the like of stainless steel, brass, or the like, and includes three joint pipe insertion holes 21Ei1, 21Si1, 21Ci1 (see (a) to (C) of fig. 4) in this order along the axis C direction, and the E-joint pipe 1E, S joint pipe 1S, C joint pipe 1C is attached to each of the joint pipe insertion holes 21Ei1, 21Si1, 21Ci 1. Further, when the valve seat body 21 is formed by forging, it is preferable to be able to reduce the machining man-hour and to reduce the cost, because it is easy to have an arc shape corresponding to the inner peripheral surface of the pilot valve body 10 described below, compared with the cutting machining. The sheet member 25 is made of a thin plate of stainless steel or the like, and includes three straight through holes 25Es1, 25Ss1, 25Cs1 (see (a) to (C) of fig. 4) in order along the axis C direction, and the straight through holes 25Es1, 25Ss1, 25Cs1 are in fluid communication with the E-joint pipe 1E, S joint pipe 1S, C joint pipe 1C.

The plunger 30 is made of magnetic stainless steel, and includes communication paths 34A and 34B and a recess 34D communicating with each other along an axis C. The inner diameter of the communication path 34B is set larger than the inner diameter of the communication path 34A, and a coil spring support portion 34C is formed between the communication path 34A and the communication path 34B. The plunger 30 includes a cylindrical portion 31 having a cylindrical shape extending in the direction of the axis C, a front end surface 32 facing the left side in the direction of the axis C, and an opening edge 33 connected to the front end surface 32.

Further, a connecting rod 35 is fixed to the plunger 30. Specifically, one end of the connecting rod 35 is received in the recess 34D of the plunger 30, and the opening edge 33 is deformed by caulking, thereby fixing the connecting rod 35. One end of the connecting rod 35 is connected to one end of a valve spring 41 made of metal by a connecting member 36 such as a rivet. Further, at the other end of the connecting rod 35, an opening 35A is formed in which the slide valve body 40 is slidably received.

The outer diameter of the cylindrical portion 31 is set to be slightly smaller than the inner diameter of the pilot valve body 10 so that the plunger 30 is guided to be slidable in the axial line C direction in the pilot valve body 10. Here, in order to restrict the movement of the plunger 30 and the slide valve 40 described below in the pilot valve body 10 to the left side in the axial direction C, a ring-shaped retainer ring 37 is provided in the pilot valve body 10. The retainer ring 37 has an outer diameter substantially equal to the outer diameter of the cylindrical portion of the pilot valve body 10 and an inner diameter smaller than the outer diameter of the cylindrical portion 31 of the plunger 30, and is fixed in a state of abutting against the valve seat portion 20.

The slide valve body 40 is made of a resin such as PTFE, is housed in the opening portion 35A of the coupling rod 35 so as to be slidable in the up-down direction, and is biased toward the upper surface of the valve seat portion 20 by the other end of the valve spring 41 as a biasing mechanism with a predetermined load. The slide valve body 40 has a concave portion 40A which is opened downward and is formed in a space with the valve seat portion 20. The slide valve body 40 is coupled to the plunger 30, and is movable in the axial direction C inside the pilot valve body 10, whereby the communication state with the plurality of joint pipes 1C, 1D, 1E, 1S (see fig. 4 (a) and 4 (b)) can be switched, which will be described in detail below.

The attraction member 50 is made of magnetic stainless steel, and is fixed to the pilot valve body 10 by welding after being inserted into the right opening in the cylindrical portion of the pilot valve body 10. In order to urge the plunger 30 in the direction of separating from the suction tool 50 along the axis C, the coil spring 51 is sandwiched between the coil spring support 34C and the left end of the suction tool 50.

The electromagnetic coil unit 60 selectively excites the plunger 30 and the attraction member 50, and includes a molded coil portion 61 disposed on an outer peripheral portion of a cylindrical portion of the pilot valve body 10, a case 62 made of a magnetic material that covers and houses the molded coil portion 61, and a lead 63 that electrically connects the molded coil portion 61 to an external drive control portion (not shown). The electromagnetic coil unit 60 is fixed to the attraction member 50 by screwing the small screw 64 with the female screw hole 50A of the attraction member 50 via the mounting hole 62A of the housing 62.

Structure of valve seat

In the conventional sliding type switching valve, as described above, the first problem (the large stroke length of the sliding valve body) can be solved by disposing the small-diameter valve holes on both sides of the three small-diameter valve holes opened in the valve seat surface of the valve seat portion so as to be close to the small-diameter valve hole in the center. However, when viewed from a direction perpendicular to the valve seat surface, the contours of the small-diameter valve holes on both sides intersect with the contours of the capillary tube, and burrs are generated at the intersection in the valve seat flow path, so that there is a new second problem (burrs are generated in the valve seat flow path).

In contrast, although described in detail below, in the sliding type switching valve 100A of the present embodiment, the structure of the valve seat portion (for example, the divided structure of the valve seat portions 20A to 20E, and the shape of the valve seat passages 20RA to 20 RE) is studied, and in the valve seat passages 20RA to 20RE as viewed from the vertical direction of the valve seat surface, a larger passage area, that is, a displacement region, is provided than one end side (upper end side: the opening end side of the valve seat surface) and the other end side (lower end side: the joint pipe end side) of the valve seat passages 20RA to 20RE, thereby solving the conventional first problem (larger stroke length of the sliding valve element). In addition, the contours of the valve seat passages 20RA to 20RE are set so as not to intersect when viewed from the vertical direction of the valve seat surface among the members forming the valve seat passages 20RA to 20RE, thereby solving the second problem (occurrence of burrs in the valve seat passages).

Here, as shown in fig. 4 to 13, in the first embodiment, the valve seat portions 20A to 20E are sequentially described in detail in terms of the modes 1-1 to 1-5, because the valve seat portions 20A to 20E are configured in terms of five modes 1-1 to 1-5 according to the divided structure of the valve seat portions 20A to 20E, the shape of the valve seat passages 20RA to 20RE, and the positioning mechanisms 25g to 27g, 25h, 21p, 21 w.

In addition, the symbols (for example, 25Es1, 21Sd1, 21Ci1, etc.) for the sheet member and the valve seat body indicate that the members having "E", "S", "C" in the third position from the beginning are respectively fluidically connected to the E-joint pipe, the S-joint pipe, and the C-joint pipe, the members having "S", "d", and "i" in the fourth position from the beginning indicate straight through holes, stepped portions, and joint pipe insertion holes, and the members having "1" to "5" in the end indicate forms 1-1 to 1-5, respectively. The same reference numerals are given to the same structures, and duplicate descriptions are omitted. The width of each through hole of the seat surfaces of the sheet members 25A to 25D and the first sheet member 26 in the embodiments 1 to 5 in the direction orthogonal to the axis C is set to be the same as the width in the direction of the axis C, but the width in the direction orthogonal to the axis C may be set to be equal to or greater than the width in the direction of the axis C.

(concerning morphology 1-1)

With reference to fig. 4 and 5, the following description will be given of the valve seat portion 20A of the first embodiment of the present invention of the following description of the dividing structure of the valve seat portion, the shape of the valve seat flow path, the positioning mechanism, and the assembling process.

Division structure of valve seat part

As shown in fig. 4 (a) and 4 (b), the valve seat portion 20A includes the sheet member 25A and the valve seat body 21A as separate members, a valve seat flow path 20RA through which the working fluid directly flows is formed in the sheet member 25A and the valve seat body 21A, and a joint pipe insertion region 20IA is formed in the valve seat body 21A in order to secure the insertion margin of the joint pipes 1E, 1S, 1C. The joint pipe insertion region 20IA is formed in a single cylindrical shape with respect to the three joint pipe insertion holes 21Ei1, 21Si1, 21Ci1 (see (e) and (f) of fig. 5). In the present embodiment, only the joint pipes 1E, 1S, and 1C are inserted into the joint pipe insertion holes 21Ei1, 21Si1, and 21Ci1 in the joint pipe insertion region 20IA, and the working fluid does not directly flow through the joint pipe insertion holes 21Ei1, 21Si1, and 21Ci1, so the valve seat flow path 20RA does not include the joint pipe insertion holes 21Ei1, 21Si1, and 21Ci1.

In the present embodiment, the sheet member 25A is formed from a thin plate of stainless steel by punching and pressing and etching, and then the straight through holes 25Es1, 25Ss1, 25Cs1 are formed by punching, etching (half etching), or the like. Therefore, the machining of the cutting hole of the sheet member 25A and the surface finish machining of the upper surface of the sheet member 25A to which the slide valve body 40 slides are not required, and the machining man-hour can be further reduced.

< shape of valve seat flow passage >

As shown in fig. 4 (a), the valve seat flow path 20RA is composed of straight through holes 25Es1, 25Ss1, 25Cs1 (see fig. 5 (a) to (c)) of the sheet member 25A and a stepped hole 20DA (see fig. 5 (e)) of the valve seat body 21A. As shown in fig. 5 (d) and (e), the different-diameter stepped hole 20DA is constituted by the stepped portion 21Ed1 and the straight through hole 21Es1, the stepped portion 21Sd1 and the straight through hole 21Ss1, and the stepped portion 21Cd1 and the straight through hole 21Cs1, respectively. Thus, in the present embodiment, by joining the valve seat main body 21A in which the stepped hole 20DA having a different diameter is formed and the sheet member 25A in which the straight through holes 25Es1, 25Ss1, 25Cs1 are formed to each other, the complicated valve seat flow path 20RA can be easily formed.

In the present embodiment, as shown in fig. 5 (a) and (d), the stepped portions 21Ed1, 21Sd1, 21Cd1 having a larger flow path area than the one end side (the straight through holes 25Es1, 25Ss1, 25Cs1 of the sheet member 25A) and the other end side (the straight through holes 21Es1, 21Ss1, 21Cs 1) of the valve seat flow path 20RA are interposed in the valve seat flow path 20RA when viewed from the perpendicular direction of the valve seat surface. The fluid connection from the other end side (straight through holes 21Es1, 21Ss1, 21Cs 1) of the valve seat flow path 20RA to the joint pipes 1E, 1S, 1C is performed without substantially changing the flow path area. Here, the stepped portions 21Ed1, 21Sd1, 21Cd1 function as offset regions, are fluidly connected to the straight through holes 21Es1, 21Ss1, 21Cs1 arranged offset from the axis C in the orthogonal direction, and are also fluidly connected to the straight through holes 25Es1, 25Ss1, 25Cs1 arranged close to each other in the axis C direction of the sheet member 25A. Accordingly, since the straight through holes 25Es1, 25Ss1, 25Cs1 can be disposed close to each other by the stepped portions 21Ed1, 21Sd1, 21Cd1, the conventional first problem (the large stroke length of the slide valve body) is solved, and the amount of movement of the plunger 30 in the direction of the axis C can be reduced, so that the attractive force between the plunger 30 and the suction tool 50 increases, and further, the cost of the electromagnetic coil unit 60 and the power saving of the coil are realized. Further, the contours of the straight through holes 25Es1, 25Ss1, 25Cs1 in the sheet member 25A as viewed from the vertical direction of the valve seat surface do not intersect as shown in fig. 5 (a), and the contours of the different-diameter stepped holes 20DA in the valve seat body 21A as viewed from the vertical direction of the valve seat surface, that is, the contours of the stepped portions 21Ed1, 21Sd1, 21Cd1 and the straight through holes 21Es1, 21Ss1, 21Cs1 do not intersect with each other as shown in fig. 5 (d), so that the conventional second problem (occurrence of burrs in the valve seat flow path) can be solved.

< positioning mechanism >)

The valve seat body 21A includes an alignment wall (positioning means) 21w extending along a pair of opposite sides facing each other in the direction of the axis C and provided upright. The sheet member 25A includes a positioning groove (positioning means) 25g, and the positioning groove 25 includes a slit formed along a pair of side surfaces facing each other in the direction of the axis C. In the present embodiment, when positioning the sheet member 25A with respect to the valve seat main body 21A, the use of the alignment wall 21w and the alignment groove 25g has an effect that the positioning can be performed easily and reliably.

< assembling procedure >)

Here, a process of assembling the valve seat portion 20A to the pilot valve body 10 using the positioning mechanisms 21w and 25g will be described. First, a sheet-like, annular solder is placed on the valve seat body 21A. Then, the alignment groove 25g of the sheet member 25A is placed on the alignment wall 21w of the valve seat body 21A so as to be engaged therewith, and the upper end of the alignment wall 21w is deformed by caulking, whereby the sheet member 25A is temporarily fixed to the valve seat body 21A. Thereafter, the valve seat body 21A and the sheet member 25A are joined by brazing to form the valve seat portion 20A. The valve seat portion 20A is inserted into the valve seat mounting hole 10A from the inside of the pilot valve body 10, and joined by brazing. At this time, in order to easily perform positioning with the pilot valve body 10, as shown in fig. 4 (b), the shape of the lower side surface of the valve seat body 21A has an arc shape corresponding to the inner peripheral surface of the pilot valve body 10. Finally, the joint pipes 1E, 1S, 1C are joined to the joint pipe insertion holes 21Ei1, 21Si1, 21Ci1 of the valve seat body 21A by brazing. In the present embodiment, the joint pipes 1E, 1S, and 1C are joined to the valve seat portion 20A by brazing after the valve seat portion 20A is joined to the pilot valve body 10 by brazing, but the present invention is not limited thereto, and for example, joining of the valve seat portion 20A to the pilot valve body 10 and joining of the joint pipes 1E, 1S, and 1C to the valve seat portion 20A may be performed simultaneously. The joining of the members in the present embodiment may be performed by brazing, welding, diffusion bonding, or the like.

< action on sliding type switching valve >)

The operation of the sliding type switching valve 100A will be described with reference to fig. 3. Here, the straight through holes 21Es1, 21Ss1, 21Cs1 in the protruding portion 14 and the valve seat portion 20A of the pilot valve body 10 function as the first port 14, the second port 21Es1, the third port 21Ss1, and the fourth port 21Cs1 in the fluid path, respectively.

The slide valve 40 is reciprocally moved in the direction of the axis C by the plunger 30 to switch the position of the recess 40A of the slide valve 40 with respect to the seat portion 20A. Thereby, two ports out of the adjacent three ports (the second port 21Es1, the third port 21Ss1, the fourth port 21Cs 1) of the valve seat portion 20A selectively communicate.

First, as shown in fig. 3, when the sliding type switching valve 100A is in the coil non-energized state, the plunger 30 is urged by the coil spring 51, and the distal end surface 32 of the plunger 30 abuts against the retainer 37, while the sliding valve body 40 moves to the left side position with respect to the valve seat portion 20A. At this time, the second port 21Es1 communicates with the third port 21Ss1 via the recessed portion 40A of the slide valve body 40, the fluid flows from the E-joint pipe 1E to the S-joint pipe 1S, and the first port 14 communicates with the fourth port 21Cs1, and the fluid flows from the D-joint pipe 1D to the C-joint pipe 1C.

Next, although not shown, when the sliding type switching valve 100A is in the coil energized state, the right end portion of the plunger 30 is attracted to the attraction member 50 by the magnetic force and contacts the attraction member, while the sliding valve body 40 moves to the right side position with respect to the valve seat portion 20A. At this time, the fourth port 21Cs1 communicates with the third port 21Ss1 via the recessed portion 40A of the slide valve body 40, the fluid flows from the C-joint pipe 1C to the S-joint pipe 1S, and the first port 14 communicates with the second port 21Es1, and the fluid flows from the D-joint pipe 1D to the E-joint pipe 1E. As described above, since the sliding type switching valve 100A according to the first embodiment is a direct-acting electromagnetic spool valve, it is possible to improve responsiveness to an external drive control unit and to switch a flow path at an early stage.

As described above, when the sliding type switching valve 100A is in the coil non-energized state, the fluid flows from the E-joint pipe 1E to the S-joint pipe 1S, and the fluid flows from the D-joint pipe 1D to the C-joint pipe 1C, whereby the pair of pistons 220A, 220B in the pilot type four-way switching valve 200 moves to the right side position. Accordingly, the refrigeration cycle 1 shifts to a cooling operation state in which the refrigerant flows in the order of the compressor 300, the outdoor heat exchanger 400, the throttle device 600, and the indoor heat exchanger 500. On the other hand, when the sliding type switching valve 100A is in the coil energized state, the fluid flows from the C-joint pipe 1C to the S-joint pipe 1S, and the fluid flows from the D-joint pipe 1D to the E-joint pipe 1E, whereby the pair of pistons 220A, 220B in the pilot type four-way switching valve 200 moves to the left side position. Accordingly, the refrigeration cycle 1 shifts to a heating operation state in which the refrigerant flows in the order of the compressor 300, the indoor heat exchanger 500, the throttle device 600, and the outdoor heat exchanger 400.

(concerning morphology 1-2)

Here, the valve seat portion 20B according to the first embodiment 1-2 will be described with reference to fig. 6 and 7. The valve seat portion 20B of the first embodiment 1-2 is different from the valve seat portion 20A of the first embodiment 1-1 only in the valve seat main body 21B, but is otherwise identical in basic configuration to the first embodiment 1-1. Here, the same components are denoted by the same reference numerals, and redundant descriptions (i.e., < positioning mechanism > and < assembly process >) will be omitted, and < the split structure of the valve seat portion > and < the shape of the valve seat flow path > will be described.

Division structure of valve seat part

As shown in fig. 6 (a) and 6 (B), the valve seat portion 20B includes a sheet member 25A and a valve seat body 21B as separate members, a valve seat flow path 20RB for the working fluid is formed in the sheet member 25A and the valve seat body 21B, and a joint pipe insertion region 20IB for inserting the joint pipes 1E, 1S, 1C is formed in the valve seat body 21B, as in the case of the embodiment 1-1. In order to reduce the weight of the valve seat portion 20B, as shown in fig. 6 (B), the joint pipe insertion region 20IB is formed of three cylindrical shapes corresponding to the three joint pipe insertion holes 21Ei2, 21Si2, 21Ci2 (see fig. 7 (e), (f)), and is provided in the valve seat mounting hole 10B having three circular shapes.

< shape of valve seat flow passage >

The valve seat flow path 20RB is constituted by straight through holes 25Es1, 25Ss1, 25Cs1 of the sheet member 25A (see (a) to (c) of fig. 7) and a stepped hole 20DB of the valve seat body 21B (see (e) of fig. 7). As shown in fig. 7 (d) and (e), the different-diameter stepped hole 20DB is constituted by the stepped portion 21Ed2 and the straight through hole 21Es2, the stepped portion 21Sd2 and the straight through hole 21Ss2, and the stepped portion 21Cd2 and the straight through hole 21Cs2, respectively. When viewed from the vertical direction of the valve seat surface, the flow passage areas of the stepped portions 21Ed2, 21Sd2, 21Cd2 functioning as the offset regions are set to be larger than the flow passage areas of the stepped portions 21Ed1, 21Sd1, 21Cd1 of the form 1-1, whereby the straight through holes 21Es2, 21Ss2, 21Cs2 can be offset from the axis C in the orthogonal direction.

As described above, in the embodiment 1-2, the same effects as in the embodiment 1-1 are obtained, that is, all of the first and second problems (a large stroke length of the slide valve body, and occurrence of burrs in the valve seat flow passage) in the prior art can be solved. In addition, in the embodiment 1-2, the straight through holes 21Es2, 21Ss2, 21Cs2 are arranged so as to be further apart from each other in the orthogonal direction from the axis C, whereby the intervals between the three joint pipe insertion holes 21Ei2, 21Si2, 21Ci2 can be increased, and as a result, the fitting work of the joint pipes 1E, 1S, 1C can be smoothly performed. Further, if the joint pipe insertion region 20IB is formed in a single cylindrical shape as in the embodiment 1-1, the distance between the three joint pipe insertion holes 21Ei2, 21Si2, 21Ci2 becomes large, and the weight of the valve seat portion 20B increases. Accordingly, the joint pipe insertion region 20IB in the present embodiment is formed of three cylindrical shapes corresponding to the three joint pipe insertion holes 21Ei2, 21Si2, 21Ci2, whereby the valve seat portion 20B can be made lightweight.

(concerning morphology 1-3)

Here, the valve seat portion 20C according to the first embodiment 1 to 3 will be described with reference to fig. 8 and 9. The positioning mechanism of only the sheet member 25A 'and the valve seat body 21A' of the valve seat portion 20C of the first embodiment 1-3 is different from the valve seat portion 20A of the first embodiment 1-1, but other basic structures are the same as those of the first embodiment 1-1. Here, the same components are denoted by the same reference numerals, and redundant descriptions (i.e., < structure for dividing the valve seat >, < shape of the valve seat flow path > and < assembly process >) will be omitted, and < positioning mechanism > will be described. Further, a valve seat flow path 20RC and a joint pipe insertion region 20IC are formed in the valve seat portion 20C.

< positioning mechanism >)

The valve seat body 21A' includes positioning projections (positioning means) 21p provided upright at four corners. The sheet member 25A' is provided with positioning holes (positioning means) 25h at four corners. In the present embodiment, the positioning of the sheet member 25A 'with respect to the valve seat main body 21A' can be performed simply and reliably by using the positioning projections 21p and the positioning holes 25h. Specifically, the alignment hole 25h of the sheet member 25A 'is placed on the alignment protrusion 21p of the valve seat body 21A' so as to be engaged therewith, and the upper end of the alignment protrusion 21p is deformed by caulking, whereby the sheet member 25A 'is temporarily fixed to the valve seat body 21A'. In the present embodiment, the four positioning projections 21p and the four positioning holes 25h are provided at the four corners of each member, but the present invention is not limited thereto, and various forms such as providing two positioning projections at diagonal positions may be employed.

As described above, in the embodiment 1-3, the same effects as in the embodiment 1-1 are obtained, that is, all of the first and second problems (a large stroke length of the slide valve body, and occurrence of burrs in the valve seat flow passage) in the prior art can be solved. In addition, in the embodiments 1 to 3, by using the alignment holes 25h as the positioning means for the sheet member 25A', the alignment holes 25h can be formed together when the straight through holes 25Es1, 25Ss1, and 25Cs1 are formed, and thus the work efficiency can be improved. In addition, in the embodiments 1 to 3, since the positioning means of the sheet member 25A 'and the valve seat body 21A' are provided at four corners where interference with the valve seat flow path 20RC is difficult, the stepped holes 20DC having different diameters, particularly, the regions where the stepped portions 21Ed1, 25Sd1, 25Cd1 are formed can be designed with a high degree of freedom.

(concerning the forms 1 to 4)

Here, a valve seat portion 20D according to embodiments 1 to 4 of the first embodiment will be described with reference to fig. 10 and 11. The valve seat portion 20D of the first embodiment is different from the valve seat portion 20B of the first embodiment 1-2 in which the stepped hole 20DB is formed in the valve seat body 21B in that the stepped hole 20DD is formed in the sheet member 25D, but other basic structures are the same as those of the first embodiment 1-2. Here, the same components are denoted by the same reference numerals, and redundant descriptions (i.e., < positioning mechanism > and < assembly process >) will be omitted, and < the split structure of the valve seat portion > and < the shape of the valve seat flow path > will be described.

Division structure of valve seat part

As shown in fig. 10 (a) and 10 (b), the valve seat portion 20D includes a sheet member 25D and a valve seat body 21D as separate members, and a valve seat flow path 20RD for the working fluid is formed in the sheet member 25D and the valve seat body 21D, and a joint pipe insertion region 20ID for inserting the joint pipes 1E, 1S, 1C is formed in the valve seat body 21D, as in the embodiments 1-2.

< shape of valve seat flow passage >

As shown in fig. 10 (a), the valve seat flow path 20RD is composed of the stepped hole 20DD of the different diameter of the sheet member 25D (see fig. 11 (b)) and the straight through holes 21Es4, 21Ss4, 21Cs4 of the valve seat body 21D (see fig. 11 (D) to (f)). Thus, in the present embodiment, by joining the sheet member 25D forming the stepped hole 20DD with the valve seat main body 21D forming the straight through holes 21Es4, 21Ss4, 21Cs4 to each other, the complicated valve seat flow path 20RD can be easily formed. In this embodiment, as shown in fig. 11 (c), the stepped portions 25Ed4, 25Sd4, 25Cd4 having a larger flow path area and functioning as offset regions than the one end side (the straight through holes 25Es4, 25Ss4, 25Cs 4) and the other end side (the straight through holes 21Es4, 21Ss4, 21Cs 4) of the valve seat flow path 20RD are interposed in the valve seat flow path 20RD when viewed from the perpendicular direction of the valve seat surface. As shown in fig. 11 (b) and (c), the different-diameter stepped hole 20DD is formed of the stepped portion 25Ed4 and the straight through hole 25Es4, the stepped portion 25Sd4 and the straight through hole 25Ss4, and the stepped portion 25Cd4 and the straight through hole 25Cs4, respectively. In addition, the contours of the stepped holes 20DD of the sheet member 25D, that is, the stepped portions 25Ed4, 25Sd4, 25Cd4 and the straight through holes 25Es4, 25Ss4, 25Cs4 do not intersect with each other as shown in fig. 11 (c), and the contours of the straight through holes 21Es4, 21Ss4, 21Cs4 of the valve seat body 21D do not intersect as shown in fig. 11 (D), as seen in the vertical direction of the valve seat surface. The other end side (straight through holes 21Es4, 21Ss4, 21Cs 4) of the valve seat flow path 20RD is fluidly connected to the joint pipes 1E, 1S, 1C without substantially changing the flow path area.

As described above, in the embodiments 1 to 4, the same effects as those in the embodiments 1 to 2 are obtained, and thus all of the first and second problems (a large stroke length of the slide valve body, and occurrence of burrs in the valve seat flow passage) can be solved. In addition, in the embodiments 1 to 4, since the valve seat main body 21D is formed by forging, cutting, or the like, the processing cost and the processing time are functionally suppressed by using the straight through holes 21Es4, 21Ss4, 21Cs4 having a simple flow path shape.

(concerning morphology 1-5)

The valve seat portion 20E according to the first embodiment 1 to 5 will be described with reference to fig. 12 and 13. The valve seat portion 20E of the first embodiment is different from the valve seat portion 20D of the first embodiment in that the different-diameter stepped hole is not formed by dividing the sheet member 25D of the first embodiment 1 to 4 into the first sheet member (sheet member) 26 and the second sheet member (sheet member) 27, but other basic configurations are the same as those of the first embodiment 1 to 4. Here, the same components are denoted by the same reference numerals, and redundant descriptions (i.e., < positioning mechanism > and < assembly process >) will be omitted, and < the split structure of the valve seat portion > and < the shape of the valve seat flow path > will be described.

Division structure of valve seat part

As shown in fig. 12 (a) and 12 (b), the valve seat portion 20E includes the first sheet member 26, the second sheet member 27, and the valve seat body 21D as separate members, the valve seat flow path 20RE for the working fluid is formed in the first sheet member 26, the second sheet member 27, and the valve seat body 21D, and the joint pipe insertion region 20IE for inserting the joint pipes 1E, 1S, 1C is formed in the valve seat body 21D. In this way, by dividing the sheet member 25D in the modes 1 to 4 into the first sheet member 26 and the second sheet member 27, the straight through holes 26Es5, 26Ss5, 26Cs5 of the first sheet member 26 and the straight through holes 27Es5, 27Ss5, 27Cs5 of the second sheet member 27 are employed instead of the different-diameter stepped hole 20DD of the sheet member 25D in the modes 1 to 4.

In the present embodiment, the first sheet member 26 and the second sheet member 27 are formed from a thin plate of stainless steel by punching and pressing and etching, and then the straight through holes 26Es5, 26Ss5, 26Cs5, 27Es5, 27Ss5, 27Cs5 are formed by punching, etching (half etching), or the like. Therefore, the machining for forming the complex stepped holes in the first sheet member 26 and the second sheet member 27 and the surface finishing of the upper surface of the first sheet member 26A for sliding the slide valve body 40 are not required, and the machining man-hour can be further reduced.

< shape of valve seat flow passage >

The valve seat flow path 20RE is constituted by straight through holes 26Es5, 26Ss5, 26Cs5 of the first sheet member 26 (see fig. 13 (b)), straight through holes 27Es5, 27Ss5, 27Cs5 of the second sheet member 27 (see fig. 13 (b)), and straight through holes 21Es4, 21Ss4, 21Cs4 of the valve seat main body 21D (see fig. 13 (e)). In this embodiment, as shown in fig. 13 (c), straight through holes 27Es5, 27Ss5, 27Cs5 having a larger flow path area than one end side (straight through holes 26Es5, 26Ss5, 26Cs 5) and the other end side (straight through holes 21Es4, 21Ss4, 21Cs 4) of the valve seat flow path 20RE as seen in the vertical direction of the valve seat surface and functioning as offset regions are interposed in the valve seat flow path 20 RE. The contours of the straight through holes 26Es5, 26Ss5, 26Cs5 in the first sheet member 26 as viewed in the vertical direction of the valve seat surface do not intersect as shown in fig. 13 (a), and the contours of the straight through holes 27Es5, 27Ss5, 27Cs5 in the second sheet member 27 as viewed in the vertical direction of the valve seat surface do not intersect as shown in fig. 13 (c). In the valve seat main body 21D, the outlines of the straight through holes 21Es4, 21Ss4, 21Cs4 do not intersect as shown in fig. 13 (D) when viewed from the vertical direction of the valve seat surface. The other end side (straight through holes 21Es4, 21Ss4, 21Cs 4) of the valve seat flow path 20RE is fluidly connected to the joint pipes 1E, 1S, 1C without substantially changing the flow path area.

As described above, in the embodiments 1 to 5, the same effects as those in the embodiments 1 to 4 are obtained, that is, all of the conventional first and second problems (the large stroke length of the slide valve body, and the occurrence of burrs in the valve seat flow passage) can be solved, and the valve seat main body 21D can suppress the processing cost and the processing time by using the straight through holes 21Es4, 21Ss4, and 21Cs4 having a simple flow passage shape. In addition, in the embodiments 1 to 5, the first sheet member 26 and the second sheet member 27 can be processed more finely while suppressing the processing cost and the processing time by using the straight through holes 26Es5, 26Ss5, 26Cs5, 27Es5, 27Ss5, and 27Cs5 having a simple flow path shape.

(second embodiment)

The sliding type switching valve 100B of the second embodiment will be described with reference to fig. 14 to 16. The valve seat portion 20 '(mainly the valve seat main body 21') of the sliding type switching valve 100B of the second embodiment is different from the sliding type switching valve 100A of the first embodiment, but other basic structures are the same as the first embodiment. Here, the same members are denoted by the same reference numerals, and redundant description thereof will be omitted, and description will be given of < division structure of the valve seat portion >, < shape of the valve seat flow path >, < cross-sectional shape and arrangement of the through-holes in the first sheet member >, and < assembly process >.

As shown in fig. 13 (b) and (E), the valve seat portion 20E according to the first embodiment 1 to 5 includes the first sheet member 26, the second sheet member 27, and the valve seat main body 21D as separate members, and straight through holes are used as the valve seat flow passages 20RE in the respective members. This can suppress the processing cost and the processing time for the first sheet member 26, the second sheet member 27, and the valve seat main body 21D. However, since the cost reduction effect of the valve seat body 21D formed by forging, cutting processing, or the like is limited, further research is required from other points of view. In addition, in the first embodiment, the offset region is provided in the valve seat flow path, so that the conventional first problem (a large stroke length of the slide valve body) can be solved, but it is required to further reduce the stroke length of the slide valve body 40.

Therefore, in the sliding type switching valve 100B of the second embodiment, in order to further simplify the valve seat body 21', only the joint pipe insertion region 20IE ' is formed in the valve seat body 21', and the valve seat flow path is omitted from the valve seat body 21', whereby the valve seat body 21' can be formed from a press-worked product.

In the first embodiment 1 to 5, the straight through holes 21Es4, 21Ss4, 21Cs4 of the valve seat body 21D are used so that the flow passage area on the other end side of the valve seat flow passage 20RE is smaller than the flow passage area of the offset region, which will be described in detail below. However, in the sliding type switching valve 100B of the second embodiment, since the valve seat flow path itself of the valve seat body 21 'is omitted, in order to make the flow path area of the other end side of the valve seat flow path 20RE' smaller than that of the offset region, the tip opening portions of the joint pipes 1E, 1S, 1C inserted into the joint pipe insertion region 20IE 'are used instead of the valve seat flow path of the valve seat body 21'.

In the sliding type switching valve 100B according to the second embodiment, in order to further reduce the stroke length Ls of the sliding valve body 40, the first sheet members 26'-1 to 26' -6 made of thin plates are subjected to a minute process by press working, etching (half etching), or cutting, so that straight through holes having various cross-sectional shapes and arrangements are formed.

Here, as shown in fig. 16 (d) and 17, the second embodiment is configured from six modes 2-1 to 2-6 according to the cross-sectional shape and arrangement of straight through holes formed in the first sheet members (sheet members) 26'-1 to 26' -6, and is described in order from mode 2-1 to mode 2-6.

(concerning morphology 2-1)

Division structure of valve seat part

As shown in fig. 15 (a) and 15 (b), the valve seat portion 20' includes, as separate members, a first sheet member 26' -1, a second sheet member (sheet member) 27', and a valve seat main body 21', a joint pipe insertion region 20IE ' into which the joint pipes 1E, 1S, 1C are inserted is formed in the valve seat main body 21', and a valve seat flow path 20RE ' for the working fluid is formed in the first sheet member 26' -1 and the second sheet member 27' (including the boundary portion with each joint pipe 1E, 1S, 1C). In this way, the valve seat flow path 20RE 'is not formed in the valve seat body 21', and thus can be formed from a press-worked product made of a thin plate.

< shape of valve seat flow passage >

As shown in fig. 15 (a), (b) and 16 (a), the valve seat flow path 20RE 'is composed of straight through holes 26Es5' -1, 26Ss5'-1, 26Cs5' -1 of the first sheet member 26'-1 (see fig. 16 (C), (d)), straight through holes 27Es5', 27Ss5', 27Cs5' (see fig. 16 (E), (f)), of the second sheet member 27', and tip openings of joint pipes 1E, 1S, 1C fixed against the lower surface side of the second sheet member 27'. Specifically, as shown in fig. 16 a, one end side (upper end side) of the valve seat flow path 20RE ' is a straight through hole 26Es5' -1, 26Ss5' -1, 26Cs5' -1 of the first sheet member 26' -1, and the other end side (lower end side) of the valve seat flow path 20RE ' is three flow paths formed in the boundary portion between the second sheet member 27' and the joint pipes 1E, 1S, 1C and corresponding to the tip opening portions of the joint pipes 1E, 1S, 1C. Accordingly, in the present embodiment, as shown in fig. 16 b, straight through holes 27Es5', 27Ss5', 27Cs5' having a larger flow path area than one end side (upper end side) and the other end side (lower end side) of the valve seat flow path 20RE ' and functioning as offset regions are interposed in the valve seat flow path 20RE ' when viewed from the perpendicular direction of the valve seat surface. The profiles of the straight through holes 26Es5'-1, 26Ss5' -1, 26Cs5'-1 in the first sheet member 26' -1 as viewed from the vertical direction of the valve seat surface do not intersect as shown in fig. 16 (c) and (d), and the profiles of the straight through holes 27Es5', 27Ss5', 27Cs5 'in the second sheet member 27' as viewed from the vertical direction of the valve seat surface do not intersect as shown in fig. 16 (e) and (f).

Cross-sectional shape and arrangement of through-holes in first sheet Member

The cross-sectional shapes and arrangements of the straight through holes 26Es5'-1, 26Ss5' -1, 26Cs5'-1 in the first sheet member 26' -1 will be described with reference to fig. 16 (d). Further, it is set that the straight through holes 26Es5'-1, 26Ss5' -1 are included in the recessed region R40A (coil non-energized state T1) (solid line in the drawing) surrounded by the recessed portion 40A of the slide valve body 40 and forming the flow path, and the straight through holes 26Ss5'-1, 26Cs5' -1 are included in the recessed region R40A (coil energized state T2) (single-dot broken line in the drawing).

The straight through holes 26Es5'-1, 26Ss5' -1, 26Cs5'-1 in the first sheet member 26' -1 have the cross-sectional shape of an elliptical hole, respectively. The straight through holes 26Ss5' -1 in the center of the first sheet member 26' -1 are arranged on the axis C, while the straight through holes 26Es5' -1, 26Cs5' -1 on both sides of the first sheet member 26' -1 are arranged in a state of slightly rotating around the clockwise direction and the counterclockwise direction and being offset from the axis C in the orthogonal direction. At this time, the width of each straight through hole 26Es5' -1, 26Ss5' -1, 26Cs5' -1 in the direction orthogonal to the axis C is set to be equal to or greater than the width in the direction of the axis C.

In this way, by selecting the cross-sectional shapes and the arrangement of the straight through holes 26Es5' -1, 26Ss5' -1, 26Cs5' -1 in the first sheet member 26' -1, the flow path area of each through hole in the first sheet member 26' -1 can be ensured, and the stroke length Ls of the slide valve body 40 and the plunger 30 can be set small, so that m.o.p.d. (the highest difference in pressure between the inlet pressure and the outlet pressure of the valve among the extreme pressures at which the valve can be safely and reliably operated) can be increased, or further, the cost reduction of the electromagnetic coil unit 60 and the power saving of the coil can be realized. In the present embodiment, the through holes 26Es5' -1, 26Cs5' -1 on both sides of the first sheet member 26' -1 are each offset from the axis C in the same direction orthogonal thereto, but the present invention is not limited thereto, and for example, if the through holes 26Es5' -1, 26Cs5' -1 on both sides are included in the recessed region R40A (coil non-energized state T1) and the recessed region R40A (coil energized state T2), respectively, the through holes may be offset from the axis C in different directions orthogonal thereto.

< assembling procedure >)

The first sheet member 26'-1 and the second sheet member 27' are laminated and joined by welding or diffusion bonding. Then, the second sheet member 27' and the valve seat body 21' are joined by brazing or welding to form the valve seat portion 20'. The valve seat portion 20 'is inserted from the outside of the pilot valve body 10 to the valve seat mounting hole 10A' and joined by brazing. Finally, the joint pipes 1E, 1S, 1C are inserted into the joint pipe insertion holes 21Ei ', 21Si ', 21Ci ' of the valve seat body 21', and joined by brazing in a state of abutting against the second sheet member 27 '. In the present embodiment, the joint pipes 1E, 1S, and 1C are joined to the valve seat portion 20 'by brazing after the valve seat portion 20' is joined to the pilot valve body 10 by brazing, but the present invention is not limited thereto, and for example, joining of the valve seat portion 20 'to the pilot valve body 10 and joining of the joint pipes 1E, 1S, and 1C to the valve seat portion 20' may be performed simultaneously. The joining of the members in the present embodiment may be performed by brazing, welding, diffusion bonding, or the like.

In this way, the second embodiment has the same effects as those of the first embodiment 1 to 5, that is, it is possible to solve all of the conventional first and second problems (a large stroke length of the slide valve body, generation of burrs in the valve seat flow path). In the second embodiment, the first sheet member 26'-1 and the second sheet member 27' can suppress the processing cost and the processing time by using the straight through holes 26Es5'-1, 26Ss5' -1, 26Cs5'-1, 27Es5', 27Ss5', 27Cs5' having a simple flow path shape. In particular, by disposing the straight through holes 26Es5' -1, 26Ss5' -1, 26Cs5' -1 having the cross-sectional shape of the elliptical hole having a width equal to or greater than the width in the direction of the axis C in offset relation to the first sheet member 26' -1, the flow path area of each through hole in the first sheet member 26' -1 can be ensured, and the stroke length Ls (the gap between the plunger 30 and the suction tool 50 in the non-energized state) of the slide valve 40 can be made relatively small, so that the suction force between the plunger 30 and the suction tool 50 can be increased, and m.o.p.d. can be increased. Alternatively, since the stroke length Ls of the slide valve body 40 and the plunger 30 can be made relatively small, the number of turns of the magnet wire (not shown) in the molded coil portion 61 can be reduced, thereby realizing cost reduction of the electromagnetic coil unit 60 and power saving of the coil. In the second embodiment, the valve seat body 21' is a press-formed product made of a thin plate, so that the processing cost and the processing time can be further reduced, and the sliding type switching valve 100A can be reduced in weight.

(for forms 2-2 to 2-6)

Here, modes 2-2 to 2-6 of the second embodiment will be described with reference to fig. 17 (a) to (e). The cross-sectional shape and arrangement of the through holes in the first sheet members 26'-2 to 26' -6 of the second embodiment 2-2 to 2-6 are different from those of the second embodiment 2-1, but other basic structures are the same as those of the second embodiment 2-1. Here, the same members are denoted by the same reference numerals, and redundant descriptions thereof are omitted, and the description will be given of < the cross-sectional shape and arrangement of the through holes in the first sheet member >. Further, in the same manner as in the case of the case 2-1, in the case of the cases 2-2 to 2-6, two through holes from the left side and two through holes from the right side are set so as to be included in the recessed region R40A (coil non-energized state T1) (solid line in the drawing) and the recessed region R40A (coil energized state T2) (single-dot dashed line in the drawing), and the width of each through hole in the direction orthogonal to the axis C is set to be equal to or larger than the width in the direction of the axis C.

Cross-sectional shape and arrangement of through-holes in first sheet Member

(concerning morphology 2-2)

As shown in fig. 17 (a), the through holes 26Es5'-2, 26Ss5' -2, 26Cs5'-2 in the first sheet member 26' -2 are each constituted by an elliptical hole having an elliptical cross-sectional shape. The through holes 26Ss5'-2, 26Es5' -2, 26Cs5'-2 in the first sheet member 26' -2 are arranged in a state of being aligned along the axis C.

(concerning morphology 2-3)

As shown in fig. 17 (b), the through holes 26Es5'-3, 26Ss5' -3, 26Cs5'-3 in the first sheet member 26' -3 are each constituted by a circular hole having a circular cross-sectional shape. The through holes 26Ss5'-2, 26Es5' -2, 26Cs5'-2 in the first sheet member 26' -2 are arranged in a state of being aligned along the axis C.

(concerning morphology 2-4)

As shown in fig. 17 (c), the through-hole 26Ss5' -4 in the center of the first sheet member 26' -4 is constituted by an elliptical hole having an elliptical cross-sectional shape, and the through-holes 26Es5' -4, 26Cs5' -4 on both sides of the first sheet member 26' -4 are constituted by a pair of triangular holes having a triangular cross-sectional shape. The through holes 26Ss5'-4, 26Es5' -4, 26Cs5'-4 in the first sheet member 26' -4 are arranged in a state of being aligned along the axis C.

(concerning morphology 2-5)

As shown in fig. 17 (d), the through holes 26Ss5' -5 in the center of the first sheet member 26' -5 are constituted by circular holes having circular cross-sectional shapes, and the through holes 26Es5' -5, 26Cs5' -5 on both sides of the first sheet member 26' -5 are constituted by a pair of elliptical holes having elliptical cross-sectional shapes. The center through-hole 26Ss5' -5 in the first sheet member 26' -5 is disposed on the axis C, while the through-holes 26Es5' -5, 26Cs5' -5 on both sides in the first sheet member 26' -5 are slightly rotated in the clockwise direction and the counterclockwise direction, respectively, and are disposed in a state offset from the axis C in the orthogonal direction. Thus, the flow path area of each through hole in the first sheet member 26' -5 can be ensured, and the stroke length Ls of the slide valve body 40 can be set to be further smaller. In the present embodiment, the through holes 26Es5' -5 and 26Cs5' -5 on both sides of the first sheet member 26' -5 are each offset from the axis C in the same direction orthogonal thereto, but the present invention is not limited thereto, and for example, if the through holes 26Es5' -5 and 26Cs5' -5 on both sides are included in the recessed region R40A (the coil non-energized state T1) and the recessed region R40A (the coil energized state T2), respectively, the through holes may be offset from the axis C in different directions orthogonal thereto.

(concerning morphology 2-6)

As shown in fig. 17 (e), the through holes 26Es5'-6, 26Ss5' -6, 26Cs5'-6 in the first sheet member 26' -6 are each constituted by a quadrangular hole having a quadrangular cross-sectional shape. The through holes 26Ss5'-6, 26Es5' -6, 26Cs5'-6 in the first sheet member 26' -6 are arranged in a state of being aligned along the axis C.

As described in the above embodiments 2-2 to 2-6, by appropriately selecting the cross-sectional shape and arrangement of the through holes in which the width of the first sheet members 26'-2 to 26' -6 in the direction orthogonal to the axis C is equal to or greater than the width of the through holes in the direction of the axis C, the flow path area of each through hole in the first sheet members 26'-2 to 26' -6 can be ensured, and the stroke length Ls of the slide valve body 40 and the plunger 30 can be set relatively small, so that the m.o.p.d. can be increased, or further the cost reduction of the electromagnetic coil unit 60 and the power saving of the coil can be realized.

In the second embodiment, the cross-sectional shape of each through hole formed in the first sheet members 26'-1 to 26' -6 may be any one of an oval shape, a circular shape, a triangular shape, a quadrangular shape, and a crescent shape, or a combination of these shapes may be selected.

In the second embodiment, the description has been made of the case where the various cross-sectional shapes and arrangements shown in fig. 16 (d) and 17 are adopted in the through holes of the first sheet members 26'-1 to 26' -6, but the present invention is not limited thereto, and for example, the various cross-sectional shapes and arrangements may be adopted in the sheet members 25A and 25C and the through holes of the first sheet member 26 in the first embodiment.

< other modes >

The sliding type switching valves 100, 100A, and 100B of the present embodiment are applicable not only to the refrigeration cycle system 1 shown by way of example, but also to any fluid device and any fluid circuit. The present invention is not limited to the above-described embodiments, and modifications described below, and can be appropriately modified and changed without departing from the scope of the technical idea of the present invention.

Claims

1. A sliding type switching valve having:

a valve body having a bottomed cylindrical shape;

a valve seat portion fixed to a peripheral wall of the valve main body;

a plunger slidable in an axial direction in the valve main body; and

a sliding valve element coupled to the plunger, the sliding valve element being movable in an axial direction inside the valve body to switch a state of connection with a valve seat surface of the valve seat portion,

The above-mentioned sliding type switching valve is characterized in that,

the valve seat portion includes a valve seat main body having at least one joint pipe insertion hole for connecting a joint pipe, and a sheet member composed of a thin plate and joined to the valve seat main body and sliding the slide valve body,

in the valve seat portion, a valve seat flow path is formed in at least the sheet member and at least the former of the valve seat main body, the valve seat flow path being configured to fluidly communicate between the joint pipe and the valve seat surface,

in each member forming the valve seat flow path, the contours of the valve seat flow path do not intersect when viewed from the direction perpendicular to the valve seat surface,

an offset region having a larger flow path area than one end side and the other end side of the valve seat flow path is provided in the valve seat flow path when viewed from the vertical direction of the valve seat surface.

2. The sliding type switching valve according to claim 1, wherein,

the joint pipe insertion hole connected to the offset region is disposed so as to be separated from the axis in a direction perpendicular to the valve seat surface when viewed from the vertical direction.

3. The sliding type switching valve according to claim 1, wherein,

the valve seat flow path of either one of the valve seat body and the sheet member is provided with a stepped hole having a different diameter, the stepped hole being composed of a straight through hole and a stepped portion which is the offset region, includes the through hole when viewed from a vertical direction of the valve seat surface, and has a larger contour than the through hole.

4. The sliding type switching valve according to claim 1, wherein,

the sheet member is formed by laminating a plurality of sheet members,

the valve seat flow paths formed in the plurality of sheet members are each formed of straight through holes.

5. The sliding type switching valve according to claim 1, wherein,

the valve seat main body and the sheet member are provided with positioning means so as to engage with each other.

6. The sliding type switching valve according to claim 1, wherein,

the valve seat body is formed of a thin plate, and the valve seat flow path is not formed.

7. The sliding type switching valve according to claim 1, wherein,

the shape of the valve seat flow path in the valve seat surface of the sheet member is set so that the width in the direction orthogonal to the axis is equal to or greater than the width in the axis direction.

8. The sliding type switching valve according to claim 7, wherein,

the plurality of valve seat flow paths in the valve seat surface of the sheet member are juxtaposed in the axial direction in a state of being offset in a direction orthogonal to the axial line when viewed from the perpendicular direction of the valve seat surface.

9. A sliding type switching valve is characterized in that,

The sliding type switching valve of any one of claims 1 to 8 is a direct acting electromagnetic spool valve.

10. A refrigeration cycle system comprises a compressor, a condenser, an expansion valve, an evaporator and a pilot-type four-way switching valve, and is characterized in that,

a pilot valve using the sliding type switching valve according to claim 9 as the pilot valve of the pilot type four-way switching valve.