WO2018037876A1

WO2018037876A1 - Slide valve and refrigeration cycle system

Info

Publication number: WO2018037876A1
Application number: PCT/JP2017/028260
Authority: WO
Inventors: 岡田　聡; 知之上野; 宏光木村; 怜小泉
Original assignee: 株式会社鷺宮製作所
Priority date: 2016-08-26
Filing date: 2017-08-03
Publication date: 2018-03-01
Also published as: JP6670208B2; CN109563946A; JP2018031461A; CN109563946B

Abstract

Provided is a slide valve wherein a stopper function on pistons (3) is stabilized and variance in operating performance is reduced. The ends of a cylindrical section (101) of a valve housing (10) are sealed off with stopper bodies (1). Width expansion sections (12) are provided to the inner side of fitting sections (11) of the stopper bodies (1) that are fitted to the interior of the cylindrical section (101). Expanded stopper surfaces (12a) of the width expansion sections (12) are flush with stopper plate (32)-side (piston (3)-side) end surfaces (11a) of the fitting sections (11). Stopper plates (32) of the pistons (3) are abutted against the expanded stopper surfaces (12a), along with the end surfaces (11a). Due to this configuration, the portions of contact with the stopper plates (32) are widened only by an amount commensurate with the expanded stopper surfaces (12a). A difference in contact surface area between a portion of the contact portions that has the maximum width and a portion that has the minimum width is reduced, and the stopper function is stabilized.

Description

Slide valve and refrigeration cycle system

The present invention relates to a slide valve and a refrigeration cycle system for controlling a fluid flow.

Conventionally, as a slide valve used in a refrigeration cycle system or the like, for example, there are those disclosed in Japanese Patent Application Laid-Open No. 2004-125238 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2007-247865 (Patent Document 2). In these slide valves, a valve body is arranged on a valve seat inside a cylindrical valve housing, the valve body is connected to a pair of pistons, and the valve body is slid by the pressure of fluid applied to the pistons. is there.

FIG. 8 is an enlarged cross-sectional view of an end portion of a valve housing of a slide valve disclosed in Patent Document 1, for example. This slide valve is a switching valve, and the valve housing 9 is configured by fitting a plug 92 to the end of the cylindrical portion 91. The piston 93 is attached to the end of the connecting plate 94, and the connecting plate 94 holds a valve body (not shown). The piston 93 is configured by sandwiching a spring 93c and a packing 93d between a fixed disc 93a and a stopper plate 93b, and the piston 93 is configured to press the packing 93d against the inner peripheral surface of the cylindrical portion 91 while controlling the valve. The housing 9 can reciprocate in the direction of the axis L. The piston 93 and the connecting plate 94 (and the valve body) are stopped at the end in the valve housing 9 by the stopper plate 93b of the piston 93 coming into contact with the fitting portion 92a of the plug body 92. .

JP 2004-125238 A JP 2007-247865 A

In the above-described slide valve, when the stopper plate 93b of the piston 93 abuts on the fitting portion 92a of the plug 92, when the piston 93 abuts about the axis L, the contact between the stopper plate 93b and the fitting portion 92a occurs. The portion is as shown by the grid lines in FIG. 9 and 10 are AA cross-sectional views of FIG. However, when the piston 93 is deviated from the axis L, a contact portion between the stopper plate 93b and the fitting portion 92a is, for example, a portion indicated by a lattice line in FIG. For this reason, the difference in the contact area between the portion having the maximum width and the portion having the minimum width becomes large, and the stopper function becomes unstable. For this reason, the operation performance of the slide valve varies. The same applies to a two-way on-off valve as disclosed in Patent Document 2, for example.

It is an object of the present invention to stabilize a stopper function with respect to a piston in a slide valve and reduce variations in operating performance.

The slide valve according to claim 1 is a slide valve that controls a flow of fluid flowing through a pipe connected to the valve housing by moving a valve body by a piston in a cylindrical valve housing, and the valve housing includes: A cylindrical cylindrical portion and a plug that seals both ends of the cylindrical portion, and the plug has an annular fitting portion that is fitted into the cylindrical portion, and the piston The slide valve configured to stop on the plug body side is characterized in that an enlarged stopper surface that contacts the stopper plate of the piston is provided inside the fitting portion of the plug body.

The slide valve according to claim 2 is the slide valve according to claim 1, and is configured to stop the piston by bringing the stopper plate of the piston into contact with the fitting portion of the plug. A width expanding portion having the expansion stopper surface flush with an end surface of the fitting portion on the piston side is provided inside the fitting portion of the plug body.

A slide valve according to a third aspect is the slide valve according to the second aspect, wherein the width expanding portion is formed integrally with the fitting portion of the plug.

The slide valve according to claim 4 is the slide valve according to claim 2, wherein the width-enlarging portion is formed by an annular member fitted inside the fitting portion of the plug body. And

The slide valve according to claim 5 is the slide valve according to claim 1, comprising an annular stopper plate provided on the piston side of the fitting portion of the plug body, and the piston side of the annular stopper plate. The enlargement stopper surface is constituted by a part of the contact surface.

A refrigeration cycle system according to a sixth aspect includes the slide valve according to any one of the first to fifth aspects.

According to the first aspect of the present invention, when the piston stops, the enlarged stopper surface inside the fitting portion of the plug contacts the stopper plate of the piston. The contact area increases. Therefore, even if the piston is deviated from the center of the cylindrical portion of the valve housing, the difference in the contact area at the end in the direction of deviation is reduced, so that the stopper function is stabilized and the variation in the operating performance of the slide valve is reduced.

According to the invention of claim 2, in addition to the effect of claim 1, the end surface on the piston side of the fitting portion of the plug body and the enlarged stopper surface inside thereof are in contact with the stopper plate of the piston. The contact area is further increased, and the difference in the contact area between the end portions in the bias direction is further reduced.

According to the invention of claim 3, in addition to the effect of claim 2, the width enlarged portion having the enlarged stopper surface is formed integrally with the fitting portion, so that the enlarged stopper surface is provided only by processing the plug body. Therefore, the assembly work of the valve housing is facilitated.

According to the invention of claim 4, in addition to the effect of claim 2, the expansion stopper surface can be provided only by fitting the annular member inside the fitting portion of the plug body. A conventional one can be used without need.

According to the fifth aspect of the invention, in addition to the effect of the first aspect, the enlarged stopper surface can be configured only by providing the annular stopper plate on the piston side of the fitting portion of the plug.

According to the invention of claim 6, since the variation in the operation performance of the slide valve is reduced, a highly reliable refrigeration cycle system can be obtained.

It is a figure which shows the slide valve and refrigeration cycle of 1st Embodiment of this invention. It is an expanded sectional view of the edge part of the valve housing in the slide valve of 1st Embodiment. It is a figure which shows the contact part with respect to a stopper plate in case the piston in the slide valve of 1st Embodiment is in the center. It is a figure which shows the contact part with respect to the stopper plate when the piston in the slide valve of 1st Embodiment is biased. It is an expanded sectional view of the edge part of the valve housing in the slide valve of 2nd Embodiment. It is an expanded sectional view of the edge part of the valve housing in the slide valve of 3rd Embodiment. It is an expanded sectional view of the edge part of the valve housing in the slide valve of 4th Embodiment. It is an expanded sectional view of the edge part of the valve housing in the conventional slide valve. It is a figure which shows the contact part with respect to the stopper plate in case the piston in the conventional slide valve exists in the center. It is a figure which shows the contact part with respect to the stopper plate when the piston in the conventional slide valve is biased.

Next, an embodiment of the present invention will be described. FIG. 1 is a view showing a slide valve and a refrigeration cycle system according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of an end portion of a valve housing in the slide valve of the embodiment. The slide valve 100 according to this embodiment is a four-way switching valve, and is switched by a pilot valve 200 as described later. The slide valve 100 includes a valve seat 2, a pair of

pistons

3 and 3, a connecting plate 4, and a valve body 5 in the valve housing 10.

The valve housing 10 has a cylindrical shape, and includes a cylindrical portion 101 having a cylindrical shape and two

plug bodies

1 and 1. The

plugs

1, 1 are attached to the cylindrical part 101 by brazing, welding, or the like so as to close the end of the cylindrical part 101. The central axis of the cylindrical part 101 and the

plugs

1, 1 is the axis of the valve housing 10. L. The axis L is a sliding direction of

pistons

3 and 3 and a valve body 5 which will be described later. A D joint 6 d is attached to one side of the cylindrical portion 101 by welding, brazing, or the like, and the D joint 6 d is electrically connected to the valve housing 10.

The valve seat 2 is formed with an E port 2a, an S port 2b, and a C port 2c arranged in a straight line in the direction of the axis L of the valve housing 10, and these E port 2a, S port 2b, and C port 2c include E joint 6a, S joint 6b, and C joint 6c are attached, respectively.

The pair of

pistons

3, 3 are arranged to face each other, and each holds a spring 33 and a packing 34 by a fixed disk 31 and a stopper plate 32, and the

pistons

3, 3 hold the packing 34 of the cylindrical portion 101. It can reciprocate in the direction of the axis L while being pressed against the inner peripheral surface. Thereby, the inside of the valve housing 10 is partitioned by the two

pistons

3 and 3 into a main valve chamber 10A at the center and two

working chambers

10B and 10B on both sides of the main valve chamber 10A.

The connecting plate 4 is made of a metal plate, and this connecting plate 4 is installed between the

pistons

3 and 3 so as to be arranged on the axis L of the valve housing 10. Further, the connecting plate 4 is formed with a holding hole 4 a for holding the valve body 5 in the center thereof and through

holes

4 b and 4 c positioned on both sides of the valve body 5. The valve body 5 is held by the connecting plate 4 with a flange 51 fitted into the holding hole 4a. Then, when the

pistons

3 and 3 are moved, the valve body 5 slides on the valve seat surface of the valve seat 2 in the direction of the axis L (sliding direction) in conjunction with the connecting plate 4 at predetermined left and right positions. Stop.

The valve body 5 has a hook-shaped recess 51 </ b> A formed inside the flange 51. And the valve body 5 conduct | electrically_connects S port 2b and C port 2c by the hook-shaped recessed part 51A in the edge part position of the right side of FIG. At this time, the E port 2a is electrically connected to the D joint 6d through the through hole 4b in the main valve chamber 10A. Further, the valve body 5 conducts the S port 2b and the E port 2a through the hook-shaped recess 51A at the left end position in FIG. At this time, the C port 2c is electrically connected to the D joint 6d through the through hole 4c in the main valve chamber 10A.

The refrigeration cycle system shown in FIG. 1 is used for an air conditioner such as a room air conditioner, and includes a slide valve 100, a pilot valve 200, a compressor 300 for compressing refrigerant, and an evaporator in a cooling mode. An indoor heat exchanger 400 that functions, an outdoor heat exchanger 500 that functions as a condenser in the cooling mode, and an expansion unit that expands and decompresses refrigerant between the indoor heat exchanger 400 and the outdoor heat exchanger 500. The expansion valve 600 is connected to each other by a refrigerant pipe. The expansion means is not limited to the expansion valve 600 and may be a capillary. As described above, the refrigeration cycle system of this embodiment includes the D joint 6d connected to the discharge side of the compressor 300 and the S joint 6b connected to the suction side of the compressor 300 with respect to the valve housing 10. The E joint 6a connected to one indoor heat exchanger 400 and the C joint 6c connected to the other outdoor heat exchanger 500 are electrically connected to each other, and the valve body 5 allows the S joint 6b to be connected to the S joint 6b. The E joint 6a or the C joint 6c is selectively switched to conduct, and the C joint 6c or E joint 6a that is not conducted to the S joint 6b is conducted to the D joint 6d through the valve housing 10. Has been.

The pilot valve 200 is connected to the slide valve 100 by conduits 7a to 7d. The pilot valve 200 has a structure similar to that of the slide valve 100, for example, and switches the flow path by moving the valve body by an electromagnetic actuator or the like. The pilot valve 200 has a connection destination of a conduit 7a communicating with the S joint 6b of the slide valve 100, a conduit 7b communicating with the left working chamber 10B of the slide valve 100, and a conduit communicating with the right working chamber 10B. At the same time, the connection destination of the conduit 7d communicating with the D joint 6d of the slide valve 100 is switched between the conduit 7c and the conduit 7b.

That is, with respect to the left and right working

chambers

10B and 10B of the slide valve 100, the state in which one is decompressed and the other is made high is switched between the two working

chambers

10B and 10B. As a result, the pressure difference between the reduced pressure in the working chamber 10B and the high pressure in the main valve chamber 10A is applied to the piston 3 on the reduced working chamber 10B side. Thereby, the piston 3, the connecting plate 4, and the valve body 5 are moved, the position of the valve body 5 is switched, and the flow path of the refrigeration cycle is switched. The high-pressure refrigerant compressed by the compressor 300 flows into the main valve chamber 10A from the D joint 6d, and in the cooling operation state, the high-pressure refrigerant flows into the outdoor heat exchanger 500 from the C joint 6c. Further, in the heating operation state, the high-pressure refrigerant flows into the indoor heat exchanger 400 from the E joint 6a.

In the slide valve 100, when the flow path is switched by the movement of the valve body 5, the movement of the piston 3 and the valve body 5 is stopped by the stopper plate 32 of the piston 3 coming into contact with the plug body 1. As shown in FIG. 2, the plug body 1 has an annular fitting portion 11 that is fitted inside the cylindrical portion 101. Moreover, the width expansion part 12 which has the expansion stopper surface 12a flush with the end surface 11a of the stopper part 32 side (piston 3 side) of the fitting part 11 is provided inside the fitting part 11. In this embodiment, the width expanding portion 12 is formed integrally with the fitting portion 11 of the plug body 1. The fitting portion 11 and the width expanding portion 12 have a rotationally symmetric shape about the axis L, and the boundary between the fitting portion 11 and the width expanding portion 12 is illustrated by a two-dot chain line. Thus, the thickness in the radial direction of the combined portion of the fitting portion 11 and the width expanding portion 12 is thicker than the thickness of the other portion of the plug body 1.

FIG. 3 is a view showing a contact portion with respect to the stopper plate 32 when the piston 3 is at the center of the axis L when the stopper plate 32 comes into contact with the plug body 1. 3 and 4 are sectional views taken along line AA in FIG. As described above, since the enlarged stopper surface 12a is provided inside the fitting portion 11 of the plug 1, the enlarged stopper surface 12a is a stopper of the piston 3 together with the end surface 11a of the fitting portion 11 on the stopper plate 32 side. It abuts on the plate 32 and stops the piston 3. Thereby, as shown in FIG. 3, the contact portion (lattice line portion) of the abutting portion with respect to the stopper plate 32 becomes wider by the enlarged stopper surface 12a than the conventional one. Therefore, for example, as shown in FIG. 4, even when the piston 3 is deviated from the axis L, the difference in the contact area at the end of the contact portion in the deviation direction is reduced, the stopper function is stabilized, and the slide valve is operated. The variation of is reduced.

FIG. 5 is an enlarged cross-sectional view of the end portion of the valve housing in the slide valve of the second embodiment. In each of the following embodiments, an enlarged cross-sectional view of the end portion of the valve housing will be described, but the other configurations and the refrigeration cycle system of the slide valve of each embodiment are the same as those in the first embodiment. The same elements as those in the first embodiment are denoted by the same reference numerals as those in FIGS.

In 2nd Embodiment of FIG. 5, the width expansion part 13 which has the end surface 11a by the side of the stopper plate 32 (piston 3 side) of the fitting part 11 and the expansion stopper surface 13a flush with the fitting part 11 is provided. It has been. In this embodiment, the width expanding portion 13 is formed integrally with the fitting portion 11 of the plug body 1. The fitting portion 11 and the width expanding portion 13 have a rotationally symmetric shape with the axis L as the center. Thus, the thickness in the radial direction of the combined portion of the fitting portion 11 and the width expanding portion 13 is thicker than the thickness of the other portion of the plug body 1.

In 3rd Embodiment of FIG. 6, the width expansion which has the end surface 11a by the side of the stopper plate 32 (piston 3 side) of the fitting part 11 inside the fitting part 11 of the stopper 1 and the expansion stopper surface 14a which is flush. A portion 14 is provided. The widened portion 14 is composed of an annular member 14 </ b> A that is fitted inside the fitting portion 11. The annular member 14A is fixed to the fitting portion 11 by press fitting or the like. In this embodiment, since the plug body 1 may have a uniform wall thickness, manufacture is facilitated.

7, the plug body 1 ′ has an annular fitting portion 11 ′ fitted inside the cylindrical portion 101. The fitting portion 11 ′ of this embodiment has a shorter width in the axis L direction than the fitting portion 11 of the first embodiment or the like, and an annular shape provided on the stopper plate 32 side of the fitting portion 11 ′. A stopper plate 15 is provided. The annular stopper plate 15 is provided between the step portion of the cylindrical portion 101 and the plug body 1 ′, and is fixed together with the plug body 1 ′ by caulking of the cylindrical portion 101. The annular stopper plate 15 has a contact surface 15a on the stopper plate 32 side, and an enlarged stopper surface 15a1 is constituted by a part of the contact surface 15a. Also in this embodiment, as in the third embodiment, the plug body 1 ′ may have a uniform wall thickness, which facilitates manufacture.

Also in the second and third embodiments described above, the enlarged stopper surfaces 13a and 14a abut against the stopper plate 32 of the piston 3 together with the end surface 11a on the stopper plate 32 side of the fitting portion 11 to stop the piston 3. Accordingly, the contact portion of the contact portion with the stopper plate 32 is wider than the conventional one by the enlarged stopper surfaces 13a and 14a, and the piston 3 is deviated from the axis L as in the first embodiment. However, the difference in the contact area between the end portions of the contact portion in the bias direction is reduced, the stopper function is stabilized, and the variation in the operation performance of the slide valve is reduced.

In the fourth embodiment, the contact surface 15a of the annular stopper plate 15 on the stopper plate 32 side also has an enlarged stopper surface 15a, and the stopper plate 32 is in contact with the stopper plate 32 of the piston 3. The contact portion of the contact portion with respect to the contact portion is wider than the conventional one by the enlarged stopper surface 15a1, and even when the piston 3 is deviated from the axis L, the difference in the contact area of the end portion in the bias direction of the contact portion Becomes smaller, the stopper function is stabilized, and the variation in the operation performance of the slide valve is reduced.

In addition, the

plugs

1 and 1 ′ in the above embodiments are formed by cold forging, pressing, or the like using a metal member such as brass as a base material. In addition, the forging process which presses again after forming the long cylindrical fitting part in the location bulging inside the plug body 1 like the width expansion part 13 in 2nd Embodiment (FIG. 5). It is formed by. The plug body may be formed by another method such as cutting.

Moreover, although the above embodiment demonstrated the slide valve comprised as a four-way switching valve, the slide valve of this invention opens and closes the flow path of a fluid (refrigerant) like the slide valve of patent document 2, for example. Needless to say, it can be applied to any two-way valve. The slide valve applied to such a two-way valve is used not only for opening / closing a hot gas defrost type bypass circuit, but also for opening / closing a flow path that requires a large flow rate in a refrigeration cycle system, for example. be able to.

As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to these embodiments, and the design can be changed without departing from the scope of the present invention. Is included in the present invention.

DESCRIPTION OF SYMBOLS 10 Valve housing 101 Cylindrical part 1 Plug body 11 Fitting part 11a End surface 12 Width expansion part 12a Expansion stopper surface 13 Width expansion part 13a Expansion stopper surface 14 Width expansion part 14A Annular member 14a Expansion stopper surface 1 'Plug body 11' Fitting Portion 15 Annular stopper plate 15a Contact surface 15a1 Enlarged stopper surface 2 Valve seat 3 Piston 31 Fixed disk 32 Stopper plate 33 Spring 34 Packing 4 Connection plate 5 Valve body 6a E joint 6b S joint 6c C joint 6d D joint 100 Slide valve 200 Pilot valve 300 Compressor 400 Indoor heat exchanger 500 Outdoor heat exchanger 600 Expansion valve

Claims

A slide valve that moves a valve element by a piston in a cylindrical valve housing and controls a flow of fluid flowing through a pipe connected to the valve housing, wherein the valve housing includes a cylindrical cylindrical portion and the cylindrical portion. A plug body that seals both ends of the cylindrical portion, and the plug body has an annular fitting portion that is fitted inside the cylindrical portion, and stops the piston on the plug body side. In the slide valve
A slide valve comprising an enlarged stopper surface abutting against a stopper plate of the piston inside the fitting portion of the stopper.
The stopper plate of the piston is brought into contact with the fitting portion of the plug body to stop the piston, and the piston side of the fitting portion is disposed inside the fitting portion of the plug body. The slide valve according to claim 1, further comprising a width expansion portion having the expansion stopper surface flush with an end surface of the slide valve.
The slide valve according to claim 2, wherein the width-enlarging part is formed integrally with the fitting part of the plug.
3. The slide valve according to claim 2, wherein the width-enlarging part is configured by an annular member fitted inside the fitting part of the plug.
An annular stopper plate provided on the piston side of the fitting portion of the plug body is provided, and the enlarged stopper surface is constituted by a part of the abutting surface of the annular stopper plate on the piston side. The slide valve according to claim 1.
A refrigeration cycle system comprising the slide valve according to any one of claims 1 to 5.