JP7373379B2 - Slide type switching valve and refrigeration cycle system - Google Patents

Description

The present invention relates to a slide type switching valve for switching a refrigerant flow path in a heat pump type refrigeration cycle system, etc., and a refrigeration cycle system.

Conventionally, as this type of slide type switching valve, there is one disclosed in, for example, Japanese Patent Laid-Open No. 2011-241870 (Patent Document 1). This slide type switching valve has a cylindrical valve housing, and a pair of pistons that reciprocate are accommodated in this valve housing.These pistons define a main valve chamber inside the main valve chamber, and both outside ( Sub-valve chambers are defined on the left and right sides. Further, a connecting plate that holds the valve body is installed between the pistons. The piston and connecting plate, which are moved by the differential pressure between the two outer (left and right) sub-valve chambers, slide the valve body on the valve seat and switch the fluid flow path.

Japanese Patent Application Publication No. 2011-241870

In the device disclosed in Patent Document 1, cap portions are attached to both ends of a cylindrical portion by welding or the like to form a valve housing. In the case of this welding, the pressure resistance is ensured by the amount of weld penetration, but the amount of penetration depends on the performance of the welding machine.For example, if the fluid is high pressure like carbon dioxide refrigerant, it can withstand the pressure of this high pressure refrigerant. It is difficult to achieve such a penetration amount. That is, simply welding leaves room for improvement in terms of pressure resistance.

The present invention has been made in order to solve the above-mentioned problems, and improves a slide type switching valve in which a valve housing is composed of a cylindrical part and cap parts at both ends thereof. It is an object of the present invention to provide a slide type switching valve and a refrigeration cycle system in which the pressure resistance of the mounting part is improved.

In the slide type switching valve of the present invention, a piston is housed in a cylindrical valve housing, and the piston allows the inside of the valve housing to be divided into a main valve chamber and auxiliary valve chambers on both outsides (left and right) of the main valve chamber. The piston is moved by the pressure difference between the two outer (left and right) auxiliary valve chambers, and the connecting plate and valve body connected to the piston are moved, so that the flow flows through the piping connected to the valve housing. The slide type switching valve is configured to switch a fluid flow path, and the valve housing includes a cylindrical portion whose center line is the axis of the valve housing, and a cylindrical portion of the cylindrical portion in the moving direction of the valve body. and a cap portion that seals both ends, the cylindrical portion and the cap portion each having annular end surfaces facing each other and perpendicular to the axis, and the cylindrical portion and the cap portion has a female threaded portion centered on the axis on the axis side of the annular end surface on one side, and a male threaded portion centered on the axis on the axis side of the annular end surface on the other hand. , the female threaded portion and the male threaded portion are screwed together, the annular end surfaces are brought into contact with each other, and the entire circumference of the abutting portion of the annular end surfaces is welded to fix the cylindrical portion and the cap portion. It is characterized by being

In this case, it is preferable to provide a slide type switching valve characterized in that a pressure introduction pipe for introducing pressure into the sub-valve chamber in the cap portion is connected to the valve housing in a direction perpendicular to the axis.

Furthermore, the pressure introduction pipe is connected to an outer pressure introduction path provided in the cylindrical portion of the valve housing in a direction perpendicular to the axis, and an end on the axis side of the outer pressure introduction path is connected to the cylindrical portion. and the cap portion, and the pressure introduction groove opens into the sub-valve chamber through an inner pressure introduction path provided in the cap portion or the cylindrical portion. Preferably, the slide type switching valve is characterized in that the valve is connected to the valve.

Further, the slide is characterized in that the male threaded portion is formed in the cap portion, the male threaded portion is inserted into the cylindrical portion, and an end of the male threaded portion constitutes a stopper portion for the piston. A type switching valve is preferred.

Further, the slide type switching valve may be characterized in that the female threaded portion is formed in the cap portion, and a stepped portion serving as a stopper portion for the piston is provided on the back side of the female threaded portion in the axial direction.

Further, the female screw portion is formed in the cap portion, and a ring-shaped stopper member is separately provided on an inner periphery of the female screw portion of the cap portion, and a ring-shaped stopper member is separately provided on an outer periphery of the ring-shaped stopper member. A pressure introduction groove is formed therein, and an inner pressure introduction passage communicating with the pressure introduction groove and the auxiliary valve chamber is provided, and the pressure introduction groove is provided with an outer pressure introduction groove provided in the cylindrical portion of the valve housing. A slide type switching valve characterized by an open introduction passage may also be used.

The refrigeration cycle system of the present invention is a refrigeration cycle system including a compressor, a condenser, an expansion valve, an evaporator, and a flow path switching valve, wherein the slide type switching is the flow path switching valve. It is characterized by being used.

According to the slide type switching valve of the present invention, the cylindrical portion and the cap portion that constitute the valve housing are fixed by welding as well as screwing the female threaded portion and the male threaded portion, so that the valve housing is sealed by welding. At the same time, the female threaded portion and the male threaded portion are screwed into each other to be firmly fixed, and the pressure resistance of the attachment portion between the cylindrical portion and the cap portion is improved.

Further, according to the refrigeration cycle system of the present invention, a highly reliable system is realized because a slide type switching valve with improved durability is used.

FIG. 1 is a longitudinal sectional view of a slide type switching valve according to an embodiment of the present invention. It is a figure showing a slide type switching valve and a refrigeration cycle system of an embodiment. 1 is an enlarged cross-sectional view of a main part of a first example of a slide type switching valve according to an embodiment; FIG. FIG. 2 is an enlarged sectional view of a main part of a second example of the slide type switching valve according to the embodiment. FIG. 7 is an enlarged sectional view of a main part showing a third example of the slide type switching valve according to the embodiment. FIG. 7 is an enlarged cross-sectional view of a main part of a fourth example of the slide type switching valve according to the embodiment. FIG. 7 is an enlarged sectional view of a main part of a fifth example of the slide type switching valve according to the embodiment.

Next, embodiments of the present invention will be described. FIG. 1 is a longitudinal sectional view of a slide type switching valve according to an embodiment of the present invention, and FIG. 2 is a diagram showing a slide type switching valve and a refrigeration cycle system according to the embodiment. Note that FIGS. 1 and 2 illustrate the structure of a first embodiment described later. As shown in FIG. 1, the slide type switching valve 10 of this embodiment includes a valve seat 2, a pair of pistons 3, a connecting plate 4, and a valve body 5 in a valve housing 1.

The valve housing 1 is composed of a cylindrical portion 11 and two cap portions 12, 12. The cap parts 12, 12 are attached to the cylindrical part 11 so as to close the ends of the cylindrical part 11, respectively. Further, the central axes of the cylindrical portion 11 and the cap portions 12, 12 are the axis X of the valve housing 1. The valve seat 2 is disposed at an intermediate portion within the cylindrical portion 11, and a D joint pipe 13d that opens into the cylindrical portion 11 is attached at a position facing the valve seat 2 at the intermediate portion of the cylindrical portion 11. Further, an E joint pipe 13e, an S joint pipe 13s, and a C joint pipe 13c are attached to the valve seat 2 in a straight line in the axis X direction of the valve housing 1.

A pair of pistons 3, 3 are arranged to face each other, and each holds a spring 33 and a packing 34 between a fixed disk 31 and a stopper plate 32. It is possible to move back and forth while pressing against the inner peripheral surface. Thereby, the inside of the valve housing 1 is partitioned by the two pistons 3, 3 into a main valve chamber 11A in the center and two sub-valve chambers 12A, 12A on both sides of the main valve chamber 11A. The connecting plate 4 is made of a metal plate, and is installed between the pistons 3, 3 so as to be disposed on the axis X of the valve housing 1, and holds the valve body 5 in the center thereof. There is. When the pistons 3 move, the valve body 5 slides on the valve seat 2 in conjunction with the connecting plate 4, and stops at predetermined left and right positions.

A bowl-shaped recess 51A is formed inside the bulge 51 in the valve body 5. The valve body 5 connects the S joint pipe 13s and the E joint pipe 13e to each other through the bowl-shaped recess 51A at the left end position in FIG. At this time, the C joint pipe 13c is electrically connected to the D joint pipe 13d mainly through the through hole 4c within the main valve chamber 11A. Further, the valve body 5 connects the S joint pipe 13s and the C joint pipe 13c to each other through the bowl-shaped recess 51A at the right end position in FIG. At this time, the E joint pipe 13e is electrically connected to the D joint pipe 13d mainly through the through hole 4b within the main valve chamber 11A.

As shown in FIG. 2, in the refrigeration cycle system of the embodiment, the D joint pipe 13d is connected to the discharge port of the compressor 30, and the S joint pipe 13s is connected to the suction port of the compressor 30. The C joint pipe 13c is connected to the outdoor unit 40, and the E joint pipe 13e is connected to the indoor unit 50. The outdoor unit 40 and the indoor unit 50 are connected via a throttle device 60. The refrigeration cycle system is constructed by a path from the C joint pipe 13c to the outdoor unit 40, the expansion device 60, the indoor unit 50, and the E joint pipe 13e, and a path from the S joint pipe 13s to the compressor 30 and the D joint pipe 13d. It is configured.

The pilot valve 20 is connected to the slide type switching valve 10. The pilot valve 20 has a structure similar to, for example, the slide type switching valve 10, and switches the flow path by moving a valve body using an electromagnetic actuator or the like. This pilot valve 20 connects a conduit that communicates with the S joint pipe 13s of the slide type switching valve 10 to a pressure introduction pipe 14L that communicates with the left side auxiliary valve chamber 12A of the slide type changeover valve 10, and a pressure introduction pipe 14L that communicates with the left side auxiliary valve chamber 12A of the slide type changeover valve 10. At the same time, the connection destination of the conduit communicating with the D joint pipe 13d of the slide type switching valve 10 is switched between the pressure introduction pipe 14R and the pressure introduction pipe 14L. As a result, the piston 3, connecting plate 4, and valve body 5 are moved due to the pressure difference between the reduced pressure in the sub-valve chamber 12A and the pressure in the opposite sub-valve chamber 12A, and the position of the valve body 5 is switched. the flow path of the refrigeration cycle system is switched.

With the above configuration, the high-pressure refrigerant compressed by the compressor 30 flows into the main valve chamber 11A from the D joint pipe 13d, and in the state of cooling operation shown in FIG. is flowing into the country. Further, in the heating operation state in which the valve body 5 is switched, the high-pressure refrigerant flows into the indoor unit 50 from the E joint pipe 13e. That is, during cooling operation, the refrigerant discharged from the compressor 30 circulates from the C joint pipe 13c → the outdoor unit 40 → the expansion device 60 → the indoor unit 50 → the E joint pipe 13a, and the outdoor unit 40 is connected to a condenser (condenser), The indoor unit 50 functions as an evaporator to provide cooling. Furthermore, during heating operation, the refrigerant is circulated in the opposite direction, and the indoor unit 50 functions as a condenser and the outdoor unit 40 functions as an evaporator, thereby providing heating.

Next, an example of the fixing structure between the cylindrical portion 11 and the cap portion 12 of the valve housing 1 and the pressure introduction pipe will be described with reference to an enlarged sectional view of the main parts thereof. Note that similar members and elements in each of the following embodiments are denoted by the same reference numerals. FIG. 3 is an enlarged sectional view of a main part of the slide type switching valve of the first embodiment, and FIG. 3(B) is an enlarged view of the portion P in FIG. 3(A). The cylindrical part 11 has an annular end surface 111 formed at the end thereof on the side of the cap part 12 and is perpendicular to the axis X. Orthogonal annular end surfaces 121 are formed. Further, the cylindrical portion 11 is formed with a female threaded portion 11a centered on the axis X on the axis X side of the annular end surface 111, and the cap portion 12 is formed with an axis X on the axis X side of the annular end surface 121. A centrally provided male threaded portion 12b is formed.

The female threaded portion 11a of the cylindrical portion 11 and the male threaded portion 12b of the cap portion 12 are screwed together, and their annular end surfaces 111 and 121 face each other and are in contact with each other. Then, the entire circumference of the abutting portion of the annular end surfaces 111 and 121 is welded, and the cylindrical portion 11 and the cap portion 12 are fixed. A molten solidified layer W is formed at the welding location. Further, the end of the male threaded portion 12b of the cap portion 12 on the cylindrical portion 11 side serves as a stopper portion S that comes into contact with the stopper plate 32 of the piston 3. Furthermore, in this first embodiment, a pressure introduction passage 12c is formed at the center of the cap part 12, that is, on the axis X, and a pressure introduction pipe 14R (14L) is connected from the outside of the cap part 12 to the pressure introduction passage 12c on the axis ) are connected.

FIG. 4 is an enlarged sectional view of a main part of the slide type switching valve of the second embodiment, and FIG. 4(B) is an enlarged view of the portion P in FIG. 4(A). The cap part 12 has an annular end face 122 formed at the end on the cylindrical part 11 side that is annular and perpendicular to the axis X; Orthogonal annular end surfaces 112 are formed. In addition, the cap portion 12 is formed with a female screw portion 12a centered on the axis X on the axis X side of the annular end surface 122, and the cylindrical portion 11 is formed with an axis X on the axis X side of the annular end surface 112. A centrally provided male threaded portion 11b is formed. The female threaded portion 12a and the male threaded portion 11b are screwed together, and their annular end surfaces 122, 112 face each other and are in contact with each other. Then, the entire circumference of the abutting portion of the annular end surfaces 122 and 112 is welded, and the cylindrical portion 11 and the cap portion 12 are fixed. In addition, in this second embodiment, a pressure introduction path 12c is formed at the center of the cap portion 12, and a pressure introduction pipe 14R (14L) is connected thereto, similarly to the first embodiment. Further, a step portion extending toward the axis X side is provided on the back side of the female screw portion 12a of the cap portion 12 in the direction of the axis X, and this step portion serves as a stopper portion S that comes into contact with the stopper plate 32 of the piston 3.

FIG. 5 is an enlarged cross-sectional view of the main parts of a slide type switching valve according to the third embodiment. The female threaded portion 11a of the cylindrical portion 11 and the male threaded portion 12b of the cap portion 12 are screwed together by bringing the annular end surface 111 of the cylindrical portion 11 into contact with the annular end surface 121 of the cap portion 12. Further, the entire circumference of the abutting portion of the annular end surfaces 111 and 121 is welded, and the cylindrical portion 11 and the cap portion 12 are fixed. Further, the end of the male threaded portion 12b of the cap portion 12 on the cylindrical portion 11 side serves as a stopper portion S that comes into contact with the stopper plate 32 of the piston 3.

In this third embodiment, inner pressure introduction passages 12c orthogonal to the axis X are formed at four locations around the axis X in a portion adjacent to the male threaded portion 12b of the cap portion 12, and an annular end surface 121 of the male threaded portion 12b is formed. A circumferential groove is provided at a position intersecting with the inner pressure introduction path 12c on the outer periphery adjacent to the side, and a pressure introduction groove 12d is formed around the entire circumference by this groove and the inner periphery of the cylindrical portion 11. Further, an outer pressure introduction path 11c that communicates with the pressure introduction groove 12d and is orthogonal to the axis X is formed at one location of the female threaded portion 11a of the cylindrical portion 11. A pressure introduction pipe 14R (14L) for introducing pressure into the sub-valve chamber 12A is connected. Thereby, the pressure introduction pipe 14R is connected to the valve housing 1 in a direction perpendicular to the axis It is introduced into the sub-valve chamber 12A via the pressure introduction path 12c. Since the pressure introduction pipe 14R is disposed in the direction perpendicular to the axis X, the pressure is lower than that in the first embodiment where the pressure introduction pipe is connected from the outside of the cap part to the pressure introduction path on the axis X. The length of the entire switching valve including the introduction pipe in the axis X direction can be reduced.

Here, if an outer pressure introduction path is provided in the cap part 12, when the cap part 12 is screwed to the cylindrical part 11, the rotational position of the outer pressure introduction path will not be at a constant position, and the connection of the pressure introduction pipe will be difficult. cause trouble. Therefore, as shown in FIG. 5, the reason why the outer pressure introduction path 11c of the cylindrical portion 11 is formed and the pressure introduction pipe 14R (14L) is connected thereto is because the connection position of the pressure introduction pipe is always kept at a constant position. This is to do so. Further, the reason why the circumferential pressure introduction groove 12d is formed between the outer pressure introduction passage 11c of the cylindrical part 11 and the inner pressure introduction passage 12c of the cap part 12 is because the inner pressure introduction passage of the cap part 12 is formed in the same manner as described above. Even if the rotational position of the inner pressure introduction passage 12c is not at a constant position, one end of the inner pressure introduction passage 12c opens in the circumferential pressure introduction groove 12d, thereby forming a communication passage that allows pressure to be introduced into the auxiliary valve chamber. This is what I did. Here, there are four inner pressure introduction passages 12c, but if the total cross-sectional area of the inner pressure introduction passages 12c is greater than or equal to the passage cross-sectional area of the outer pressure introduction passage 11c, one or more places may be provided. Good too.

FIG. 6 is an enlarged sectional view of the main parts of the slide type switching valve of the fourth embodiment, and the fixing structure between the cylindrical part 11 and the cap part 12 and the stopper part S of this fourth embodiment are the same as those of the third embodiment. The annular end surface 111 of the cylindrical portion 11 and the annular end surface 121 of the cap portion 12 are brought into contact with each other, and the female threaded portion 11a of the cylindrical portion 11 and the male threaded portion 12b of the cap portion 12 are screwed together. Further, the entire circumference of the abutting portion of the annular end surfaces 111 and 121 is welded, and the cylindrical portion 11 and the cap portion 12 are fixed. Further, the end of the male threaded portion 12b of the cap portion 12 on the cylindrical portion 11 side serves as a stopper portion S that comes into contact with the stopper plate 32 of the piston 3. This fourth embodiment is a modification of the third embodiment, in that the inner pressure introduction passage 12c', the pressure introduction groove 12d', and the outer pressure introduction passage 11c' are formed on the stopper part S side adjacent to the male threaded part 12b. It is. As a result, the thickness of the cap portion 12 is smaller than that of the third embodiment.

FIG. 7 is an enlarged cross-sectional view of the main part of the slide type switching valve of the fifth embodiment. The male threaded portion 11b of the cylindrical portion 11 and the female threaded portion 12a of the cap portion 12 are screwed together with the annular end surface 112 of the cylindrical portion 11 and the annular end surface 122 of the cap portion 12 in contact with each other. Further, the entire circumference of the abutting portion of the annular end surfaces 112 and 122 is welded, and the cylindrical portion 11 and the cap portion 12 are fixed. In this fifth embodiment, an annular stopper member 12' is provided separately from the cap member 12A on the inner peripheral side of the cylindrical portion 11 and inside the cap member 12A. The end on the cylindrical portion 11 side serves as a stopper portion S' that comes into contact with the stopper plate 32 of the piston 3. Further, in this fifth embodiment, an inner pressure introduction path 12c' and a pressure introduction groove 12d' similar to those in the fourth embodiment are formed in the stopper member 12', and an outer pressure introduction path 11c' at the end of the cylindrical portion 11 is formed. A pressure introduction pipe 14R (14L) is connected and arranged in a direction orthogonal to the axis X.

As in each of the above embodiments, the cylindrical portion 11 and the cap portion 12 constituting the valve housing 1 are fixed by welding and screwing the female threaded portion 11a (or 12a) and the male threaded portion 12b (or 11b). has been done. Therefore, the valve housing 1 is hermetically sealed by welding, and is firmly fixed by the screwing of the female threaded portion and the male threaded portion, and the pressure resistance of the attachment portion between the cylindrical portion 11 and the cap portion 12 is improved.

Furthermore, in addition to the above effects, by arranging the pressure introduction pipes 14R and 14L from the pilot valve 20 to the auxiliary valve chamber 12A in a direction orthogonal to the axis X of the valve housing 20, the overall direction of the axis X of the switching valve is The length can be reduced.

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and the design may be changed without departing from the gist of the present invention. Even if there is, it is included in the present invention.

1 Valve housing 11 Cylindrical portion 111 Annular end surface 11A Main valve chamber 111 Annular end surface 11a Female threaded portion 11b Male threaded portion 12 Cap portion 12A Sub-valve chamber 121 Annular end surface 12a Female threaded portion 12b Male threaded portion 13e E joint pipe 13s S joint pipe 13c C joint pipe 13d D joint pipe 2 Valve seat 3 Piston 4 Connection plate 5 Valve body

Claims (7)

A piston is housed in a cylindrical valve housing, and the piston defines the inside of the valve housing into a main valve chamber and auxiliary valve chambers on both outer sides of the main valve chamber. The slide type switching valve is configured to move the piston using a differential pressure, move a connecting plate and a valve body connected to the piston, and switch the flow path of the fluid flowing through the piping connected to the valve housing. hand,
The valve housing is composed of a cylindrical part whose center line is an axis of the valve housing, and a cap part that seals both ends of the cylindrical part in a moving direction of the valve body,
The cylindrical portion and the cap portion each have annular end surfaces facing each other and perpendicular to the axis; one has a female threaded part provided around the axis, and the other has a male threaded part provided around the axis on the axis side of the annular end surface, and the female threaded part and the male threaded part are screwed together. The slide type switching valve is characterized in that the annular end surfaces are brought into contact with each other and the entire circumference of the abutting portion of the annular end surfaces is welded to fix the cylindrical portion and the cap portion. 2. The slide type switching valve according to claim 1, wherein a pressure introduction pipe for introducing pressure into the auxiliary valve chamber in the cap portion is connected to the valve housing in a direction perpendicular to the axis. The pressure introduction pipe is connected to an outer pressure introduction path provided in the cylindrical portion of the valve housing in a direction perpendicular to the axis, and an end on the axis side of the outer pressure introduction path is connected to the cylindrical portion and the It opens into a pressure introduction groove formed circumferentially between the cap part and the pressure introduction groove, and the pressure introduction groove communicates with the sub-valve chamber via an inner pressure introduction path provided in the cap part or the cylindrical part. The slide type switching valve according to claim 2 , characterized in that: Claim 1, wherein the male threaded portion is formed in the cap portion, the male threaded portion is inserted into the cylindrical portion, and an end portion of the male threaded portion constitutes a stopper portion for the piston. 4. The slide type switching valve according to any one of 3 to 3. Any one of claims 1 to 3, wherein the female threaded portion is formed in the cap portion, and a stepped portion serving as a stopper portion for the piston is provided on the back side of the female threaded portion in the axial direction. The slide type switching valve described in . The female screw part is formed in the cap part, and a ring-shaped stopper member is separately provided on the inner peripheral side of the cylindrical part and inside the cap member, and a circular ring-shaped stopper member is provided on the outer periphery of the ring-shaped stopper member. A pressure introduction groove is formed therein, and an inner pressure introduction passage communicating with the pressure introduction groove and the auxiliary valve chamber is provided, and the pressure introduction groove is provided with an outer pressure introduction groove provided in the cylindrical portion of the valve housing. 3. The slide type switching valve according to claim 1, wherein the introduction path is open. A refrigeration cycle system comprising a compressor, a condenser, an expansion valve, an evaporator, and a flow path switching valve, wherein the slide type switching according to any one of claims 1 to 6 controls the flow path. A refrigeration cycle system characterized by being used as a road switching valve.

Images