Sliding type switching valve and refrigeration cycle system

Abstract

The purpose of the present invention is to provide a sliding-type switching valve and a refrigeration cycle system capable of suppressing the vibration of a plunger and improving the stability of a switching operation. A pilot valve (2) (sliding switching valve) is provided with a valve body (30), a valve seat member (40), a valve body (50), a valve body holding section (71), a first plunger (73), a second plunger (76), and a first electromagnetic drive section (80) and a second electromagnetic drive section (90). The first electromagnetic driving part (80) is provided with a first attraction piece (81) and a first electromagnetic coil (84), and the second electromagnetic driving part (90) is provided with a second attraction piece (91) and a second electromagnetic coil (94). The second plunger (76) has a circumferential surface shape that is slidably guided by the inner circumferential surface of the valve body (30) and has a larger area than the first plunger (73), and a plunger spring (78) that urges the first plunger (73), the second plunger (76), and the valve body holding section (71) toward the first suction member (81) or the second suction member (91) is provided within the valve chamber (31).

Description

Technical Field

[0001] The invention relates to a sliding switching valve and a refrigeration cycle system. Background Art

[0002] A sliding switching valve (pilot valve) is known, which comprises: a valve body (valve housing and plunger housing) having a valve chamber inside; a valve seat portion (pilot valve seat) provided on the valve body and having a plurality of valve ports; a valve core (pilot valve core) that can be slidably provided on the valve seat surface of the valve seat portion and switch the connection state of the piping connected to the valve chamber; a valve core retaining portion (valve core retaining hole) that retains the valve core; a first and second plunger (plunger) that can move forward and backward in the valve body integrally with the valve core retaining portion; and a first and second electromagnetic drive portion (electromagnetic coil and suction member) that drives the valve core retaining portion, the first and second plungers along the axial direction of the valve body. In the sliding switching valve, the plunger is formed into a generally cylindrical shape and has a flat surface portion (D-shaped cut surface) facing the valve seat surface.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2011-241870 Summary of the invention

[0006] Problems to be solved by the invention

[0007] In the conventional sliding switching valve, since the flat surface is formed over the entire length of the plunger, the area to be slidably guided by the inner peripheral surface of the valve body is insufficient, and the plunger may tilt or lock during the forward and backward movement. In addition, when the power is not supplied, the plunger may vibrate in the valve body, and the durability of the plunger and the valve body may be deteriorated due to wear.

[0008] An object of the present invention is to provide a slide-type switching valve and a refrigeration cycle system, which can suppress the vibration of the plunger and improve the stability of the switching action.

[0009] Solutions to Solve Problems

[0010] In order to solve the above-mentioned problems and achieve the purpose, the slide-type switching valve of the present invention comprises: a valve body having a valve chamber inside; a valve seat portion which is provided in the valve body and has a plurality of valve ports; a valve core which is slidably provided on a valve seat surface of the valve seat portion; a valve core holding portion which holds the valve core; a first plunger and a second plunger which are provided so as to be able to move forward and backward in the valve body integrally with the valve core holding portion; and a first electromagnetic drive portion and a second electromagnetic drive portion which drive the valve core holding portion, the first plunger and the second plunger along the axial direction of the valve body, wherein the slide-type switching valve is characterized in that the first electromagnetic drive portion has a first attracting member and a first electromagnetic coil, the second electromagnetic drive portion has a second attracting member and a second electromagnetic coil, the second plunger has a peripheral surface shape whose area is larger than that of the first plunger and which is slidably guided by the inner peripheral surface of the valve body, and a plunger spring is provided in the valve chamber, and the plunger spring urges the first plunger, the second plunger and the valve core holding portion toward the first attracting member or the second attracting member.

[0011] According to the present invention, the second plunger has a circumferential shape whose area guided by the inner circumferential surface of the valve body is larger than that of the first plunger, so that the second plunger can ensure an appropriate sliding area relative to the valve body, and the stability of the switching action of the valve core can be improved. In addition, due to the provision of a plunger spring, the first plunger, the second plunger and the valve core holding part can be moved to the first suction member side or the second suction member side by force, and the state of pressing in the same direction can be maintained. Therefore, even if the power is not supplied, the vibration of the first plunger and the second plunger (plunger) can be suppressed. Therefore, a sliding switching valve can be provided, which can suppress the vibration of the plunger and improve the stability of the switching action. In addition, due to the provision of a plunger spring, the driving force of the first electromagnetic drive unit that attracts the first plunger can be reduced by the amount of the force of the plunger spring, or the driving force of the second electromagnetic drive unit that attracts the second plunger can be reduced. Therefore, the first electromagnetic drive unit or the second electromagnetic drive unit can be miniaturized, the working voltage of the first electromagnetic drive unit or the second electromagnetic drive unit can be reduced, etc., which can contribute to the miniaturization or low cost of the sliding switching valve.

[0012] At this time, it is preferred that the second plunger has a cylindrical outer peripheral surface that is slidably guided by the inner peripheral surface of the valve body over substantially the entire circumference. According to such a structure, since substantially the entire circumference of the outer peripheral surface of the second plunger can be slidably guided by the inner peripheral surface of the valve body, the second plunger portion can be used to suppress the inclination of the first plunger, the valve core holding portion, and the second plunger, and suppress the locking of the first plunger, the valve core holding portion, and the second plunger. Therefore, the stability of the switching action of the valve core can be further improved.

[0013] In addition, it is preferred that the first plunger has a planar portion, and the planar portion has an opposing surface that is opposed to the valve seat surface of the valve seat portion. According to such a structure, the first plunger can be moved in a state where the opposing surface of the planar portion is opposed to the valve seat surface. In addition, in this structure, since a space of at least the height from the inner peripheral surface of the valve body to the valve seat surface is generated between the first plunger and the inner peripheral surface of the valve body, the valve seat portion can also be set using this space. Therefore, it is also possible not to prepare a special space for setting the valve seat portion in the valve body, and accordingly, the valve body can be prevented from being enlarged.

[0014] In addition, it is preferred that the plunger spring applies force to the first plunger, the second plunger, and the valve core holding portion toward the first attracting member. According to such a structure, the driving force of the first electromagnetic drive unit that attracts the first plunger can be reduced by the amount of the force of the plunger spring. Therefore, the first electromagnetic drive unit can be miniaturized, the operating voltage of the first electromagnetic drive unit can be reduced, etc., which can contribute to the miniaturization or cost reduction of the sliding switching valve.

[0015] In addition, the area of ​​the end face of the second plunger opposite to the second suction piece is preferably larger than the area of ​​the end face of the first plunger opposite to the first suction piece. According to such a structure, it is easy to obtain a pressing force between the second plunger and the second suction piece to resist the action of the plunger spring and press the second plunger toward the second suction piece, thereby improving the stability of the switching action of the valve core.

[0016] In addition, it is preferred that the first plunger has a first through hole that passes through from the end surface opposite to the first suction piece to the outer peripheral surface. In the sliding switching valve, the first plunger is attracted by the first suction piece, so the first plunger abuts against the first suction piece. At this time, there is a situation where a vacuum state is formed between the abutting surfaces and the first plunger is attached to the first suction piece. Therefore, a large driving force is required to disengage the first plunger from the first suction piece. However, according to the present structure, a first through hole is provided in the first plunger, so that when the first plunger abuts against the first suction piece, the abutting surfaces are connected to the valve chamber via the outer peripheral surface of the first plunger. Therefore, a vacuum state can be prevented between the first plunger and the first suction piece, and the first plunger can be prevented from being attached to the first suction piece. In addition, the attachment of the first plunger to the first suction piece can be prevented, and a large driving force is not required when driving the second plunger, so that the second electromagnetic coil can be prevented from being enlarged.

[0017] In addition, it is preferred that the first through hole extends from the end surface opposite to the first suction piece to the planar portion. According to such a structure, when the first plunger abuts against the first suction piece, the abutting surfaces are connected to the valve chamber via the planar portion. Therefore, it is possible to prevent the first plunger and the first suction piece from becoming a vacuum state, and to prevent the first plunger from being attached to the first suction piece. In addition, the portion where the planar portion is located is a portion in the valve chamber where a space is generated between the first plunger and the inner circumferential surface of the valve body as described above. Therefore, when the first plunger abuts against the first suction piece, the space is made the connection destination of the first through hole, thereby making it easy for the abutting surfaces to be reliably connected to the valve chamber, and it is possible to further prevent the abutting surfaces from becoming a vacuum state.

[0018] In addition, the second plunger preferably has an insertion hole for inserting a plunger spring, and the insertion hole is formed concavely from the end surface opposite to the second suction member. According to such a structure, by inserting the plunger spring into the insertion hole, the plunger spring can be stored in the second plunger, which can help save space for the valve body. In this way, the sliding switching valve can be miniaturized.

[0019] In addition, the second plunger preferably has a second through hole, which penetrates from the end surface opposite to the second suction piece to the outer peripheral surface. According to this structure, the second through hole is provided in the second plunger, so that when the second plunger abuts against the second suction piece, the abutting surfaces are connected to the valve chamber via the outer peripheral surface of the second plunger. Therefore, it is possible to prevent the second plunger and the second suction piece from becoming a vacuum state, and to prevent the second plunger from being attached to the second suction piece.

[0020] In addition, it is preferred that the first plunger has a first through hole, which passes through from the end surface opposite to the first suction piece to the outer peripheral surface, and the second plunger has an insertion hole for inserting a plunger spring, and the insertion hole is formed concavely from the end surface opposite to the second suction piece. According to this structure, when the first plunger abuts against the first suction piece, the abutting surfaces are connected to the valve chamber via the outer peripheral surface of the first plunger, thereby preventing the first plunger and the first suction piece from becoming a vacuum state, and preventing the first plunger from being attached to the first suction piece. In addition, by inserting the plunger spring into the insertion hole, the plunger spring can be stored in the second plunger, which can help save space for the valve body.

[0021] In addition, it is preferred that the area of ​​the second adsorption surface of the second plunger that contacts the second attraction member is larger than the area of ​​the first adsorption surface of the first plunger that contacts the first attraction member. For example, when the plunger spring applies force to the first plunger, the valve core retaining portion, and the second plunger toward the first attraction member, in order to move and press the second plunger toward the second attraction member, it is necessary to resist the force of the plunger spring, and thus a larger attraction force is required than when the first plunger is moved and pressed toward the first attraction member.

[0022] Specifically, for example, if the attraction force obtained by the magnetic force generated between the first attraction and the first plunger is set to P1, the force of the plunger spring is set to Q, the attraction force obtained by the magnetic force generated between the second attraction and the second plunger is set to P2, and the force that moves and presses the first plunger or the second plunger is set to R, then the pressing force pressing the first plunger to the first attraction becomes R=P1+Q, and on the other hand, the pressing force pressing the second plunger to the second attraction becomes R=P2-Q. Therefore, P2-P1=2Q, so the attraction force P2 needs to be at least twice greater than the attraction force P1 by the force Q. In this case, it is considered to increase the number of turns of the winding of the second electromagnetic coil, increase the driving power, etc., but accordingly, the second electromagnetic coil is enlarged or the cost for driving is increased. However, according to this structure, the area of ​​the second adsorption surface is made larger than the area of ​​the first adsorption surface, so that the attraction force P2 greater than the attraction force P1 can be obtained, so there is no need to enlarge the second electromagnetic coil and increase the driving power in order to obtain the large attraction force P2.

[0023] Furthermore, in this structure, for example, the area of ​​the second adsorption surface is adjusted in a manner that is balanced with the spring load of the plunger spring, so that the pressing force pressing the first plunger against the first attraction member can be the same as the pressing force pressing the second plunger against the second attraction member. As a result, the first electromagnetic coil and the second electromagnetic coil can be shared, and the first attraction member and the second attraction member can be shared. Therefore, the manufacturing costs of the first electromagnetic drive unit and the second electromagnetic drive unit can also be reduced. Therefore, it can contribute to the miniaturization and cost reduction of the sliding switching valve. In addition, the sharing of the first electromagnetic coil and the second electromagnetic coil, and the sharing of the first attraction member and the second attraction member are not necessary, and they do not necessarily have to be shared.

[0024] In addition, it is preferred that the first electromagnetic drive unit includes a first outer box covering the first electromagnetic coil, and the first through hole of the first plunger that penetrates from the end face opposite to the first attraction member to the outer peripheral surface includes: a first end hole portion opening at the end face opposite to the first attraction member; and a first outer peripheral hole portion connected to the first end hole portion and opening at the outer peripheral surface of the first plunger, the first attraction member includes a first mounting hole on the end face, the first mounting hole is inserted into a fixing component for fixing the first outer box, and the first end hole portion is coaxially arranged with the first mounting hole, the second electromagnetic drive unit includes a second outer box covering the second electromagnetic coil, the second plunger also includes an insertion hole for inserting the plunger spring, the second attraction member includes a second mounting hole on the end face, the second mounting hole is inserted into a fixing component for fixing the second outer box, and the insertion hole is coaxially arranged with the second mounting hole.

[0025] According to this structure, the first end hole portion constituting the first through hole is coaxially arranged with the first mounting hole of the first attracting member, so that a magnetic circuit is easily formed around the first electromagnetic coil, and the magnetic circuit is continuous in the axial direction through the first outer box, the first attracting member, and the first plunger without passing through a space such as the first end hole portion and the first mounting hole, so that the magnetic force between the first attracting member and the first plunger can be increased. In addition, the insertion hole of the second plunger is coaxially arranged with the second mounting hole of the second attracting member, so that a magnetic circuit is easily formed around the second electromagnetic coil, and the magnetic circuit is continuous in the axial direction through the second outer box, the second attracting member, and the second plunger without passing through a space such as the insertion hole and the second mounting hole, so that the magnetic force between the second attracting member and the second plunger can be increased.

[0026] In addition, it is preferred that a portion of the first adsorption surface of the first plunger abutting against the first suction member, excluding a portion where the first mounting hole is projected along the axial direction, is set as a first adsorption portion, and a portion of the second adsorption surface of the second plunger abutting against the second suction member, excluding a portion where the second mounting hole is projected along the axial direction, is set as a second adsorption portion, then an area of ​​the second adsorption portion is larger than an area of ​​the first adsorption portion.

[0027] According to such a structure, the first adsorption portion is a portion that forms a magnetic circuit that is continuous in the axial direction through the first attraction member and the first plunger without passing through a space such as the first mounting hole, and is a portion in the first adsorption surface where the magnetic force is more likely to become larger than a portion in which a space such as the first mounting hole is formed. In addition, the second adsorption portion is a portion that forms a magnetic circuit that is continuous in the axial direction through the second attraction member and the second plunger without passing through a space such as the second mounting hole, and is a portion in which the magnetic force is more likely to become larger than a portion in which a space such as the second mounting hole is formed. Furthermore, according to this structure, in the portion where the magnetic force is more likely to become larger than other portions, the area of ​​the second adsorption portion is larger than the area of ​​the first adsorption portion, so it is easier to obtain an attraction force P2 that is larger than the above-mentioned attraction force P1. Therefore, there is no need to enlarge the second electromagnetic coil or increase the driving power in order to obtain the attraction force P2.

[0028] In addition, the valve body is preferably composed of a central valve body provided with the valve seat portion, a first plunger tube connected to one side of the central valve body in the axial direction, and a second plunger tube connected to the other side of the central valve body in the axial direction.

[0029] In addition, it is preferred that the valve body is composed of an integrally circular tubular plunger tube, the valve seat portion is installed in the middle portion of the plunger tube, the first suction member is fixed at the end portion on one side of the axial direction of the plunger tube, and the second suction member is fixed at the end portion on the other side of the axial direction of the plunger tube.

[0030] According to such a structure, the valve body can be formed by a plunger tube that is an integral cylindrical tube, that is, a separate component. Therefore, the number of components of the valve body can be reduced, which helps to reduce costs. In addition, since the valve body is formed by a separate component, it is easy to prevent the axial deviation of the plunger tube, and the sliding friction of the first plunger, the second plunger, and the valve core holding part that move forward and backward in the plunger tube relative to the valve body can be suppressed. Thus, even if the driving force in the first electromagnetic drive part and the second electromagnetic drive part is not increased, the first plunger, the second plunger, and the valve core holding part can be moved forward and backward smoothly, which can contribute to the miniaturization of the first and second electromagnetic drive parts. In addition, since the sliding friction of the first plunger, the second plunger, and the valve core holding part can be suppressed, the generation of abnormal sounds in the valve body can be suppressed.

[0031] In addition, the refrigeration cycle system of the present invention is characterized by comprising the slide type switching valve described above. According to the present invention, the refrigeration cycle system can be configured using the slide type switching valve that can suppress the vibration of the plunger and improve the stability of the switching operation.

[0032] Effects of the Invention

[0033] According to the present invention, it is possible to provide a slide type switching valve and a refrigeration cycle system which can suppress the vibration of the plunger and improve the stability of the switching operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram showing a refrigeration cycle system including a slide-type switching valve according to an embodiment of the present invention.

[0035] Figure 2 This is a cross-sectional view of the slide-type switching valve cut along the axial direction of the valve body.

[0036] Figure 3 (A) is a cross-sectional view of the plunger portion of the sliding switching valve cut along the axial direction of the valve body, (B) is a front view of a first plunger constituting the plunger portion, and (C) is a front view of a second plunger constituting the plunger portion.

[0037] Figure 4 (A) is an enlarged cross-sectional view of the slide-type switching valve in which a portion of the first electromagnetic drive portion is enlarged, and (B) is a cross-sectional view of the first suction member cut in a direction perpendicular to the axial direction.

[0038] Figure 5 This is a cross-sectional view of the slide-type switching valve in the first modification example cut along the axial direction of the valve body.

[0039] Figure 6 (A) is a cross-sectional view of the plunger portion in the second modification example cut along the axial direction of the valve body, (B) is a front view of the first plunger in the second modification example, and (C) is a front view of the second plunger in the second modification example.

[0040] In the figure:

[0041] X—axis line, 2—pilot valve (sliding switching valve), 30—valve body, 31—valve chamber, 40—valve seat component (valve seat part), 41—valve seat surface, 42—first port (multiple valve ports), 43—second port (multiple valve ports), 44—third port (multiple valve ports), 50—valve core, 71—valve core retaining part, 73—first plunger, 76—second plunger, 78—plunger spring, 80—first electromagnetic drive part, 81—first attraction member, 84—first electromagnetic coil, 90—second electromagnetic drive part, 91—second attraction member, 94—second electromagnetic coil. DETAILED DESCRIPTION

[0042] The following is based on Figures 1 to 4(B) describes an embodiment of the present invention. In addition, in the following description, the direction in which the axis X of the valve body 30 described later extends is recorded as the "axis X direction". In addition, the direction intersecting the axis X direction is recorded as the "radial direction". In addition, in the following description, the concepts of "up and down, left and right" correspond to the up and down, left and right in the figure. In addition, the definition of these directions is only for the convenience of explanation, and is not necessarily limited to the directions in the actual use state of the present invention, and is not limited to the directions. Figure 1 The refrigeration cycle system 100 according to the embodiment of the present invention is shown. The refrigeration cycle system 100 includes a four-way valve 1 , a pilot valve 2 (slide type switching valve), an indoor heat exchanger 3 , a throttle device 4 , an outdoor heat exchanger 5 , and a compressor 6 .

[0043] The four-way valve 1 is a valve device that switches the flow path of the refrigerant by switching the connection state of four pipes. The four-way valve 1 includes a shell 10 and a sliding valve core 20 that is slidably disposed in the shell 10. The shell 10 includes a cylindrical body 11 with both ends closed by cover parts. The body 11 is formed by stamping a metal material such as stainless steel. A D-joint pipe 12, which is a high-pressure pipe for the flow of refrigerant, is fixed to the side wall of the body 11 in a state of being inserted in the plate thickness direction by brazing or the like, and is connected to the inside of the body 11. In the side wall of the body 11, a portion opposite to the D-joint pipe 12 is formed from Figure 1 An E-joint pipe 13 , an S-joint pipe 14 , and a C-joint pipe 15 are fixed by brazing or the like in a state where they are inserted through the plate thickness direction in order from the left side in the figure, and are communicated with the inside of the main body 11 .

[0044] The E-joint pipe 13, the S-joint pipe 14, and the C-joint pipe 15 are pipes through which the refrigerant flows, similarly to the D-joint pipe 12, and function as high-pressure pipes or low-pressure pipes. The interior of the main body 11 is divided into three spaces by the piston 23, and is composed of a high-pressure chamber 16 that is always connected to the D-joint pipe 12, a first working chamber 17 adjacent to the high-pressure chamber 16, and a second working chamber 18. The sliding valve core 20 is provided inside the main body 11 so as to be slidable in the direction of the central axis L of the main body 11, and switches the communication state of the above-mentioned D-joint pipe 12, the E-joint pipe 13, the S-joint pipe 14, and the C-joint pipe 15. The sliding valve core 20 includes a valve core main body 21, a connecting plate 22 that holds the valve core main body 21 and extends in the direction of the central axis L of the main body 11, and a pair of pistons 23 that are provided at both ends of the connecting plate 22 in the extending direction to form a pair.

[0045] The valve body 21 is formed in a bowl shape so as to open toward the E-joint pipe 13, the S-joint pipe 14, and the C-joint pipe 15. The opening of the valve body 21 is formed to cover two adjacent openings of the E-joint pipe 13, the S-joint pipe 14, and the C-joint pipe 15. Figure 1 At the left end position shown in the figure, the valve body 21 internally connects the E joint pipe 13 with the S joint pipe 14, and externally connects the D joint pipe 12 with the C joint pipe 15. Figure 1 The connecting plate 22 holds the valve body 21 at the center of the central axis L of the main body 11 and extends to one side and the other side of the central axis L. A sealing member such as a seal is installed on the piston 23, whereby the interior of the main body 11 is divided into the above-mentioned three spaces.

[0046] Specifically, the space between the pair of pistons 23 constitutes the high pressure chamber 16. Figure 1 The left side of the first working chamber 17 and the high pressure chamber 16 are Figure 1 The right side of the second working room 18 is formed. Figure 1 In the refrigeration cycle system 100 shown, the D-joint pipe 12 is connected to the discharge port of the compressor 6, and the S-joint pipe 14 is connected to the suction port of the compressor 6. In addition, the C-joint pipe 15 is connected to the outdoor heat exchanger 5, and the E-joint pipe 13 is connected to the indoor heat exchanger 3. The outdoor heat exchanger 5 and the indoor heat exchanger 3 are connected to each other via the throttle device 4. In this way, the path formed by the C-joint pipe 15, the outdoor heat exchanger 5, the throttle device 4, the indoor heat exchanger 3 and the E-joint pipe 13 and the path formed by the S-joint pipe 14, the compressor 6 and the D-joint pipe 12 constitute the refrigeration cycle system 100.

[0047] The pilot valve 2 is a sliding switching valve in the present invention, and a driving fluid for moving the sliding valve core 20 of the four-way valve 1 flows between the pilot valve 2 and the four-way valve 1. Figure 2 As shown, the pilot valve 2 includes a valve body 30, a valve seat member 40 (valve seat portion) mounted on the valve body 30, a valve core 50 sliding on the valve seat member 40, and a driving portion 60 for slidingly driving the valve core 50. The valve body 30 is formed by stamping a metal material such as stainless steel, and has a valve chamber 31 inside. The valve body 30 includes: a central valve body 32 extending in the direction of the axis X; a first plunger tube 36 connected to the left side (one side in the direction of the axis X) of the central valve body 32; and a second plunger tube 37 connected to the right side (the other side in the direction of the axis X) of the central valve body 32.

[0048] The central valve body 32 is formed into a substantially cylindrical shape extending in the direction of the axis X. The central portion of the central valve body 32 in the direction of the axis X forms a large diameter portion 33 having a larger diameter than other portions. The large diameter portion 33 is formed with a capillary installation hole 34 penetrating in the radial direction and a valve seat installation hole 35 penetrating in the radial direction opposite to the capillary installation hole 34. One end of a D capillary tube 34a as a high-pressure pipe is fixed to the capillary installation hole 34 by brazing or the like in a state of being inserted through it. Figure 1 As shown, the other end of the D capillary tube 34a is connected to the above-mentioned D joint pipe 12, thereby the D capillary tube 34a is connected to the D joint pipe 12. A valve seat member 40 is inserted into the valve seat mounting hole 35. The valve seat member 40 is a member for sliding the valve core 50, and is formed into a cylindrical shape extending in a direction perpendicular to the axis X direction using a metal material such as stainless steel.

[0049] like Figure 2 As shown, the upper part of the valve seat component 40 is located in the valve chamber 31, and the lower part is located outside the valve chamber 31. The end surface of the valve seat component 40 on the valve chamber 31 side constitutes the valve seat surface 41 on which the valve core 50 slides. A first port 42, a second port 43, and a third port 44 are formed in sequence on the valve seat surface 41 from the left side to the right side in the axis X direction. That is, a plurality of valve ports are provided on the valve seat component 40. The first port 42, the second port 43, and the third port 44 are formed into a concave shape extending orthogonally to the axis X direction and opening to the valve chamber 31. On the other hand, the end surface on the outer side of the valve seat component 40 constitutes a joint surface 45. A first joint hole 46, a second joint hole not shown, and a third joint hole 48 are formed in sequence on the joint surface 45 from the left side to the right side in the axis X direction.

[0050] One end of the first joint hole 46 is connected to the first port 42, and the other end is open at the joint surface 45. The other end opening of the first joint hole 46 is inserted into the opening to fix the first working capillary 46a by brazing or the like. One end of the second joint hole is connected to the second port 43, and the other end is open at the joint surface 45. The other end opening of the second joint hole is inserted into the opening to fix the S capillary 47 by brazing or the like. One end of the third joint hole 48 is connected to the third port 44, and the other end is open at the joint surface 45. The other end opening of the third joint hole 48 is inserted into the opening to fix the second working capillary 48a by brazing or the like. Figure 1 As shown, the first working capillary 46a is connected to the first working chamber 17 of the four-way valve 1. In addition, the S capillary 47 is connected to the S joint pipe 14 of the four-way valve 1. In addition, the second working capillary 48a is connected to the second working chamber 18 of the four-way valve 1.

[0051] like Figure 2As shown, the first plunger tube 36 is formed into a substantially cylindrical shape and extends in the direction of the axis X. The right end of the first plunger tube 36 is inserted into the left end opening of the central valve body 32 and fixed by brazing or the like. The second plunger tube 37 is formed into a substantially cylindrical shape and extends in the direction of the axis X. The left end of the second plunger tube 37 is inserted into the right end opening of the central valve body 32 and fixed by brazing or the like. The valve chamber 31 inside the valve body 30 formed in this way accommodates the valve core 50. The valve core 50 is as shown in FIG. Figure 2 As shown in the figure, it is formed in a columnar shape extending in a direction intersecting the axis X direction.

[0052] The valve core 50 is retractable in the direction of the axis X while being retracted and held in the valve core retracting hole 72a of the valve core holding portion 71 described later. A recessed portion 52 opening toward the valve seat surface 41 is formed on the surface of the valve core 50 that is opposite to the valve seat surface 41. The opening of the recessed portion 52 is formed to a size that covers two adjacent openings of the first port 42, the second port 43, and the third port 44. The recessed portion 52 is configured so that the sealing surface 53 as the opening edge thereof moves forward and backward in the direction of the axis X while sliding on the valve seat surface 41. By moving forward and backward in the direction of the axis X, the connection state of the first port 42, the second port 43, and the third port 44 is switched. As a result, the connection state of the D capillary 34a, the first working capillary 46a, the S capillary 47, and the second working capillary 48a is switched.

[0053] Specifically, in Figure 2 At the left end position shown in FIG. 1 , the recess 52 internally connects the first working capillary 46a with the S capillary 47, and externally connects the D capillary 34a with the second working capillary 48a. In this state, the high-pressure driving fluid that flows into the valve chamber 31 through the D capillary 34a flows toward the valve seat member 40 through the pressure equalizing hole 72 described later, and flows toward the third port 44 that is not covered by the recess 52 through the second working capillary 48a. Figure 1 On the other hand, the low-pressure driving fluid flowing into the recess 52 through the S capillary 47 flows from the first port 42 through the first working capillary 46a to the second working chamber 18 of the four-way valve 1 shown in FIG. Figure 1 The illustrated four-way valve 1 has an inflow into the first working chamber 17 .

[0054] On the other hand, when the valve core 50 moves from the left end position to the right side and is located at the right end position (not shown), the recessed portion 52 connects the second working capillary 48a with the S capillary 47 internally and connects the D capillary 34a with the first working capillary 46a externally. In this state, the high-pressure driving fluid that flows into the valve chamber 31 through the D capillary 34a flows toward the valve seat member 40 through the pressure equalizing hole 72, and flows into the first port 42 that is not covered by the recessed portion 52 through the first working capillary 46a. Figure 1The first working chamber 17 of the four-way valve 1 is shown. On the other hand, the low-pressure driving fluid that flows into the recess 52 through the S capillary 47 flows from the third port 44 through the second working capillary 48a into the second working chamber 18 of the four-way valve 1.

[0055] The driving unit 60 is a part that enables the valve core 50 and the plunger unit 70 described later to move forward and backward in the axis X direction, and includes the plunger unit 70 extending in the axis X direction, a first electromagnetic driving unit 80 arranged on the left side of the plunger unit 70, and a second electromagnetic driving unit 90 arranged on the right side of the plunger unit 70. The plunger unit 70 is arranged in the valve chamber 31 and is set to be able to move forward and backward in the valve chamber 31 along the axis X direction, as shown in FIG. Figure 3 As shown in (A), it includes a valve core holding portion 71, and a first plunger 73 and a second plunger 76 which are integrally provided with the valve core holding portion 71 and set to have the same maximum outer diameter. A pressure equalizing hole 72 is formed in the center of the valve core holding portion 71 in the direction of the axis X and passes through in a direction orthogonal to the axis X. The pressure equalizing hole 72 includes: a valve core receiving hole 72a opening on the valve seat member 40 side; a spring receiving hole 72b communicating with the valve core receiving hole 72a; and a connecting hole 72c communicating with the spring receiving hole 72b and opening on the side of the capillary mounting hole 34 mentioned above.

[0056] In the valve core receiving hole 72a, the valve core is received and maintained. Figure 2 The valve core 50 shown in FIG. The spring receiving hole 72b is formed to have a smaller diameter than the valve core receiving hole 72a, and a force applying member 51 in a contracted state is accommodated therein. The force applying member 51 is a spring, and one end of the force applying member 51 abuts against the step between the spring receiving hole 72b and the communication hole 72c, and the other end of the force applying member 51 abuts against the top of the valve core 50. Thus, the valve core 50 is urged toward the valve seat member 40 side by the spring load of the force applying member 51. The communication hole 72c opens toward the opening of the D capillary 34a, thereby enabling the D capillary 34a, the valve chamber 31, the first working capillary 46a, the S capillary 47, and the second working capillary 48a to communicate.

[0057] like Figure 3 As shown in (A), the first plunger 73 is provided continuously with the left end of the valve core holding portion 71 and is formed into a substantially cylindrical shape extending to the left. Figure 4 As shown in (B), the maximum outer diameter γ of the first plunger 73 is set to be the same as the maximum outer diameter σ of the second plunger 76, and most of the outer peripheral surface of the portion having the maximum outer diameter γ is slidably guided by the inner peripheral surface of the valve body 30. Figure 3As shown in (A), a plane portion 74 is formed on the lower surface of the first plunger 73, which is continuous with the left end surface C (the end surface facing the first suction member 81 described later) and extends along the axis X. The plane portion 74 is formed from the left end surface C of the first plunger 73 to the lower surface of the first plunger 73 and the lower surface of the valve core holding portion 71, and a part of it becomes an opposing surface 74a facing the valve seat surface 41 of the valve seat member 40. Figure 3 As shown in (B), due to the formation of the flat portion 74, the end surface C of the left side of the first plunger 73 becomes a D shape when viewed from the front, thereby generating a space between the inner peripheral surface of the valve body 30 and the first plunger 73. Therefore, unlike other parts of the outer peripheral surface guided by the inner peripheral surface of the valve body 30, the part of the flat portion 74 is configured not to slide on the inner peripheral surface of the valve body 30. In addition, the flat portion 74 can also be called a D-shaped cut surface.

[0058] The first through hole 75 is formed in the first plunger 73, which passes from the left end surface C to the outer peripheral surface. In the present embodiment, the first through hole 75 is formed by a first end hole portion 75a formed coaxially with the axis X, and a first peripheral hole portion 75b connected to the first end hole portion 75a and opened in the plane portion 74. In addition, this is only an example, and the first end hole portion 75a may not necessarily be coaxial with the axis X, and the first peripheral hole portion 75b may also be opened in the outer peripheral surface of the first plunger 73 other than the plane portion 74. In addition, a plurality of first through holes 75 may be formed. In addition, the end surface of the left end surface C of the first plunger 73, except for the portion where the first through hole 75 is formed and the portion where the plane portion 74 is formed, is a surface that can abut against the first suction member 81 described later, and constitutes the first adsorption surface A adsorbed by the first suction member 81.

[0059] The second plunger 76 is provided continuously with the right end of the valve core holding portion 71 and is formed in a substantially cylindrical shape extending to the right. Figure 4 As shown in (B), the maximum outer diameter σ of the second plunger 76 is set to be the same as the maximum outer diameter γ of the first plunger 73. Figure 3As shown in (C), the second plunger 76 is not provided with the flat surface portion 74, and has an outer peripheral surface that is slidably guided by the inner peripheral surface of the valve body 30 for substantially the entire circumference. That is, compared with the first plunger 73 having the flat surface portion 74 that does not slide on the inner peripheral surface of the valve body 30, the second plunger 76 is formed to have a peripheral surface shape having a larger area that is slidably guided by the inner peripheral surface of the valve body 30. In addition, the maximum outer diameter γ of the first plunger 73 is the same as the maximum outer diameter σ of the second plunger 76. In contrast, since the second plunger 76 is not provided with a surface like the flat surface portion 74 of the first plunger 73, the area of ​​the right end surface D of the second plunger 76 (the end surface facing the second suction member 91 described later) is larger than the area of ​​the left end surface C of the first plunger 73. In addition, the larger the dimension of the second plunger 76 in the axis X direction is, the more the sliding area with the valve body 30 can be ensured, and the forward and backward movement of the plunger part 70 is stable. Therefore, it is preferred to set the length that does not interfere with the valve seat component 40 during the forward and backward movement as a limit and set it as large as possible.

[0060] like Figure 3 As shown in (A), the second plunger 76 is formed with an insertion hole 77, which opens at the right end surface D (the end surface opposite to the second suction member 91 described later), is recessed to the left and extends in the direction of the axis X. Figure 2 The plunger spring 78 shown in the figure. One end of the plunger spring 78 abuts against the end surface on the left side of the second attracting member 91 described later, and the other end of the plunger spring 78 abuts against the step portion between the insertion hole 77 and the second through hole 79 described later, thereby the first plunger 73, the second plunger 76 and the valve core holding portion 71, that is, the entire plunger portion 70 is urged toward the first attracting member 81. In addition, the acting force Q of the plunger spring 78 can be appropriately changed, but in the present embodiment, the acting force Q is adjusted to the extent that the first adsorption surface A of the first plunger 73 abuts against the end surface on the right side of the first attracting member 81 when the first electromagnetic coil 84 and the second electromagnetic coil 94 described later are not excited. As a result, even when the driving unit 60 is not energized, the plunger portion 70 moves toward the first attracting member 81 side and maintains a state of being pressed in the same direction, thereby suppressing the vibration of the plunger portion 70.

[0061] The second plunger 76 is provided with a second through hole 79 which is connected to the insertion hole 77 and penetrates from the right end face D (the end face opposite to the second suction piece 91) to the outer peripheral face. In the present embodiment, the second through hole 79 is formed by a second end hole portion 79a which is formed coaxially with the axis X, and a second outer peripheral hole portion 79b which is connected to the second end hole portion 79a and opens on the lower face of the second plunger 76. In addition, this is only an example, and the second end hole portion 79a may not necessarily be coaxial with the axis X, and the second outer peripheral hole portion 79b may open on the outer peripheral face of the second plunger 76 other than the lower face. In addition, a plurality of second through holes 79 may be formed. In addition, the end face of the right end face D of the second plunger 76 other than the portion where the insertion hole 77 is formed is a face which can abut against the second suction piece, and constitutes a second suction face B which is suctioned by the second suction piece 91. In addition, in the present embodiment, the area of ​​the second suction face B is set to be larger than the area of ​​the first suction face A described above.

[0062] In addition, in the present embodiment, the area of ​​the second adsorption surface B is set to be larger than the area of ​​the first adsorption surface A, but it is not limited to that these relationships must be established. For example, in the case where the area of ​​the end surface of the first suction member 81 is smaller than the area of ​​the end surface C on the left side of the first plunger 73, and the area of ​​the end surface of the second suction member 91 is smaller than the area of ​​the end surface D on the right side of the second plunger 76, there is a case where the area of ​​the first adsorption surface A is equal to the area of ​​the second adsorption surface B, or the area of ​​the first adsorption surface A is larger than the area of ​​the second adsorption surface B. In addition, the relationship between the areas of the first adsorption surface A and the second adsorption surface B also changes depending on the opening area of ​​the first end hole portion 75a, the opening area of ​​the insertion hole 77, or the size of the width direction Y of the flat portion 74.

[0063] Furthermore, in this embodiment, regardless of the opening area of ​​the first end hole 75a and the opening area of ​​the insertion hole 77, the area of ​​the right end surface D of the second plunger 76 is larger than the area of ​​the left end surface C of the first plunger 73. According to this shape, it is easy to obtain a pressing force R between the second plunger 76 and the second attractor 91 to resist the urging force Q of the plunger spring 78, thereby improving the stability of the switching action of the valve core 50.

[0064] like Figure 4As shown in (A), the first electromagnetic drive unit 80 includes: a first attraction member 81 arranged in parallel with the first plunger 73 in the direction of the axis X; a first electromagnetic coil 84 for exciting the first attraction member 81; and a first outer box 88 surrounding the first electromagnetic coil 84. The first attraction member 81 is formed in a cylindrical shape extending in the direction of the axis X, and is fixed to the inner circumferential surface of the left side of the first plunger tube 36 in the valve body 30 by welding or the like. A first mounting hole 82 (mounting hole) opening on the left side is formed on the end surface on the left side of the first attraction member 81. An internal thread is formed on the inner circumferential surface of the first mounting hole 82, and a first bolt 83 as a fixing member is threadedly coupled to the internal thread. The first mounting hole 82 is coaxial with the first end hole portion 75a in the first through hole 75 of the above-mentioned first plunger 73 on the axis X.

[0065] In addition, if Figure 4 As shown in (B), the diameter α of the first mounting hole 82 is set to be larger than the diameter β of the first through hole 75 of the first plunger 73. The first electromagnetic coil 84 includes: a first hollow bobbin 85 formed in a cylindrical shape; a first winding 86 wound around the outer circumference of the first hollow bobbin 85; and a first molded resin 87 covering the outer circumference of the first winding 86. A first insertion hole 85a is formed in the center of the first hollow bobbin 85 and penetrates in the direction of the axis X coaxially with the axis X. The first insertion hole 85a is a hole through which the first plunger tube 36 is inserted, and the size of the inner diameter thereof is set to be slightly larger than the size of the outer diameter of the first plunger tube 36.

[0066] The first outer box 88 is a part of the outer shell that surrounds the first electromagnetic coil 84 and constitutes the first electromagnetic drive unit 80. For example, a plate-shaped magnetic material is punched out by stamping, bending, etc., and is formed into a square tube shape as a whole. A first opening 88a that is coaxial with the axis X and passes through in the direction of the axis X is formed on the side wall on the right side of the first outer box 88, and the first plunger tube 36 is inserted through the first opening 88a. A first fixing hole 88b that is coaxial with the axis X and passes through in the direction of the axis X is formed on the side wall on the left side of the first outer box 88. The above-mentioned first bolt 83 is inserted into the first fixing hole 88b. When the first bolt 83 is inserted into the first fixing hole 88b, the first bolt 83 is threadedly engaged with the first mounting hole 82 of the first suction member 81, so that the first outer box 88 is fixed to the valve body 30.

[0067] like Figure 2As shown, the second electromagnetic drive unit 90 includes: a second attracting member 91 arranged at a distance from the second plunger 76 in the axis X direction; a second electromagnetic coil 94 for exciting the second attracting member 91; and a second outer box 98 surrounding the second electromagnetic coil 94. The second attracting member 91 is formed in a cylindrical shape extending in the axis X direction with the same diameter as the first attracting member 81, and is fixed to the inner peripheral surface of the right side of the second plunger tube 37 in the valve body 30 by welding or the like. A second mounting hole 92 opening on the right side is formed in the end surface on the right side of the second attracting member 91. An internal thread is formed on the inner peripheral surface of the second mounting hole 92, and a second bolt 93 as a fixing member is threadedly engaged with the internal thread. The second mounting hole 92 is coaxial with the second end hole portion 79a and the insertion hole 77 in the second through hole 79 of the above-mentioned second plunger 76 on the axis X. The second electromagnetic coil 94 includes: a second hollow bobbin 95 formed in a cylindrical shape; a second winding 96 wound around the outer circumference of the second hollow bobbin 95; and a second molded resin 97 covering the outer circumference of the second winding 96. A second insertion hole 95a is formed at the center of the second hollow bobbin 95, which is coaxial with the axis X and penetrates in the direction of the axis X. The right end of the second plunger tube 37 is inserted into the second insertion hole 95a.

[0068] The second outer box 98 is a part of the outer shell that surrounds the second electromagnetic coil 94 and constitutes the second electromagnetic drive unit 90. For example, a plate-shaped magnetic material is punched out by stamping, bending, etc., and is formed into a square tube shape as a whole. A second opening 98a that is coaxial with the axis X and passes through in the direction of the axis X is formed on the side wall on the left side of the second outer box 98, and the second plunger tube 37 is inserted into the second opening 98a. A second fixing hole 98b that is coaxial with the axis X and passes through in the direction of the axis X is formed on the side wall on the right side of the second outer box 98. The second bolt 93 mentioned above is inserted into the second fixing hole 98b. When the second bolt 93 is inserted into the second fixing hole 98b, the second bolt 93 is threadedly engaged with the second mounting hole 92 of the second suction member 91, so that the second outer box 98 is fixed to the valve body 30.

[0069] Next, the assembly of a part of the pilot valve 2 is described. First, insert the D capillary tube 34a into the capillary mounting hole 34 of the valve body 30, and insert the valve seat component 40 into the valve seat mounting hole 35 of the valve body 30. In addition, insert the first plunger tube 36 into the left end of the valve body 30, and insert the second plunger tube 37 into the right end of the valve body 30. Then, these components are fixed to the valve body 30 by brazing in a furnace environment to form a first assembly. Next, install the first suction piece 81 on the first assembly. Specifically, the first suction piece 81 is pressed into the first plunger tube 36 and fixed to the inner peripheral surface of the left end of the first plunger tube 36 by welding. In this way, the second assembly is constructed.

[0070] Next, the plunger portion 70 is inserted into the opening of the second plunger tube 37 of the second assembly, and the third assembly is constructed in which the plunger portion 70 is housed in the valve body 30. At this time, the force-applying member 51 is set in the spring housing hole 72b of the valve core holding portion 71 in the plunger portion 70, and the valve core 50 is set in the valve core housing hole 72a in advance. In addition, the plunger spring 78 is set in advance in the insertion hole 77 of the second plunger 76 in the plunger portion 70. Finally, the third assembly is mounted on the second suction piece 91. Specifically, the second suction piece 91 is pressed into the second plunger tube 37 and fixed to the inner peripheral surface of the right end of the second plunger tube 37 by welding. Thus, the assembly of the pilot valve 2 is completed.

[0071] Next, the operation of the refrigeration cycle system 100 will be described. In the refrigeration cycle system 100, the flow state of the driving fluid is changed by the pilot valve 2, thereby moving the sliding valve element 20 of the four-way valve 1 to switch the Figure 1 When switching from the heating state to the cooling state, first, a power source (not shown) is turned on to apply voltage to the first electromagnetic drive unit 80. As a result, the first electromagnetic coil 84 is excited. Figure 4 As shown in (A), a magnetic circuit M is formed around the first electromagnetic coil 84, through the first outer box 88 and the first attracting member 81. Due to the formation of the magnetic circuit M, an attractive force P1 obtained by magnetic force is generated between the first attracting member 81 and the first plunger 73. Due to the combined pressing force R of the attractive force P1 and the force Q of the plunger spring, the first plunger 73 is slid and guided to the left and pressed against the first attracting member 81. In addition, the first adsorption surface A of the first plunger 73 is adsorbed on the right end surface of the first attracting member 81.

[0072] Here, if Figure 4 As shown in (A), the outer peripheral side portion of the first adsorption surface A is a portion that forms a continuous magnetic circuit M in the axis X direction through the first attraction member 81 and the first plunger 73 without passing through a space such as the first mounting hole 82, and is a portion where the magnetic force is likely to increase. In this embodiment, the portion where the magnetic force is likely to increase is set as the first adsorption portion a1. Specifically, as Figure 4 As shown in (B), the portion of the first attraction surface A except for the projection portion a2 of the first mounting hole 82 in the axis X direction (that is, the portion where the magnetic path M is formed through the space such as the first mounting hole 82) becomes the first attraction portion a1.

[0073] Furthermore, as described above, in the present embodiment, the first mounting hole 82 is coaxial with the first end hole portion 75a of the first plunger 73 described above on the axis X. In addition, the diameter α of the first mounting hole 82 is set to be larger than the diameter β of the first through hole 75 of the first plunger 73. Therefore, when the first attraction member 81 and the first plunger 73 are viewed from the axis X direction, the space such as the first mounting hole 82 is concentrated near the axis X, and it is easy to fully ensure the area of ​​the first adsorption portion a1, and the magnetic force generated between the first plunger 73 and the first attraction member 81 becomes larger.

[0074] Furthermore, when the first adsorption surface A of the first plunger 73 is adsorbed to the right end surface of the first suction member 81, the first adsorption surface A and the right end surface of the first suction member 81 are connected to the valve chamber 31 through the first through hole 75, so that a vacuum state is not formed, and the first plunger 73 is prevented from being attached to the first suction member 81. Furthermore, in this state, the first working capillary 46a and the S capillary 47 are connected by the valve core 50, and the D capillary 34a and the second working capillary 48a are connected.

[0075] Therefore, the high-pressure driving fluid flowing into the valve chamber 31 through the D capillary 34a flows toward the valve seat member 40 through the pressure equalizing hole 72, and flows toward the valve seat member 40 through the second working capillary 48a from the third port 44 not covered by the recess 52. Figure 1 On the other hand, the low-pressure driving fluid flowing into the recess 52 through the S capillary 47 flows from the first port 42 through the first working capillary 46a to the second working chamber 18 of the four-way valve 1 shown in FIG. Figure 1 As a result, a pressure difference is generated between the first working chamber 17 and the second working chamber 18, and the sliding valve core 20 of the four-way valve 1 moves to Figure 1 In this state, the high-pressure refrigerant compressed by the compressor 6 flows into the high-pressure chamber 16 from the D-joint pipe 12 and flows into the outdoor heat exchanger 5 from the C-joint pipe 15 .

[0076] That is, during cooling operation, the refrigerant discharged from the compressor 6 circulates with the C joint pipe 15, the outdoor heat exchanger 5, the throttling device 4, the indoor heat exchanger 3, and the E joint pipe 13, and the outdoor heat exchanger 5 functions as a condenser, and the indoor heat exchanger 3 functions as an evaporator. In addition, when switching from the heating state to the cooling state, the above-mentioned power supply (not shown) can be turned off after being turned on. This is because once the first electromagnetic coil 84 is excited, the plunger part 70 begins to move to the left, so even if the excitation is stopped later, the first plunger 73 can be abutted against the first attraction member 81 by the force Q of the plunger spring 78. In this case, compared with the structure in which the power is always turned on, the driving power of the sliding switching valve can be reduced.

[0077] On the other hand, when switching from the cooling state to the heating state, first, the power supply (not shown) is turned on to apply voltage to the second electromagnetic drive unit 90. As a result, the second electromagnetic coil 94 is excited to form a magnetic circuit (not shown) passing through the second outer box 98 and the second attracting member 91. Due to the formation of this magnetic circuit, an attractive force P2 is generated between the second attracting member 91 and the second plunger 76, and the second plunger 76 is slid and guided to the right side and pressed against the second attracting member 91 by the pressing force R of the difference between the attractive force P2 and the force Q of the plunger spring 78. In addition, the second adsorption surface B of the second plunger 76 is adsorbed on the left end surface of the second attracting member 91.

[0078] Although not shown in the figure, the outer peripheral side portion of the second adsorption surface B is the same as the first adsorption surface A, and is the portion that forms a magnetic circuit that is continuous in the axis X direction through the second attraction member 91 and the second plunger 76 without passing through a space such as the second mounting hole 92, and is the portion where the magnetic force is likely to increase. In this embodiment, the portion where the magnetic force is likely to increase is set as the second adsorption portion b1 (refer to Figure 4 (B)). Specifically, in the second adsorption surface B, the portion other than the unillustrated projection portion of the second mounting hole 92 projected along the axis X direction becomes the second adsorption portion b1. And, as described above, in the present embodiment, the second mounting hole 92 is coaxial with the insertion hole 77 of the second plunger 76 described above on the axis X. Therefore, the space such as the second mounting hole 92 is concentrated near the axis X, and it is easy to fully ensure the area of ​​the second adsorption portion b1, and the magnetic force generated between the second plunger 76 and the second attraction member 91 will be large.

[0079] Furthermore, when the second adsorption surface B of the second plunger 76 is adsorbed to the left end surface of the second suction member 91, the second adsorption surface B and the left end surface of the second suction member 91 are connected to the valve chamber 31 through the insertion hole 77 and the second through hole 79, so that a vacuum state is not formed, and the second plunger 76 can be prevented from being attached to the second suction member 91. Furthermore, in this state, the second working capillary 48a is connected to the S capillary 47 by the valve core 50, and the D capillary 34a is connected to the first working capillary 46a.

[0080] Therefore, the high-pressure driving fluid flowing into the valve chamber 31 through the D capillary 34a flows toward the valve seat member 40 through the pressure equalizing hole 72, and flows into the first port 42 not covered by the recessed portion 52 through the first working capillary 46a. Figure 1The first working chamber 17 of the four-way valve 1 shown in the figure. On the other hand, the low-pressure driving fluid that flows into the recess 52 through the S capillary 47 flows into the second working chamber 18 of the four-way valve 1 from the third port 44 through the second working capillary 48a. As a result, a pressure difference is generated between the first working chamber 17 and the second working chamber 18, and the sliding valve core 20 of the four-way valve 1 moves to the right end position not shown in the figure. And, in this state, the high-pressure refrigerant compressed by the compressor 6 flows into the indoor heat exchanger 3 from the E joint pipe 13. That is, during the heating operation, the refrigerant discharged from the compressor 6 circulates with the E joint pipe 13, the indoor heat exchanger 3, the throttling device 4, the outdoor heat exchanger 5, and the C joint pipe 15, and the indoor heat exchanger 3 functions as a condenser, and the outdoor heat exchanger 5 functions as an evaporator.

[0081] In addition, in the present embodiment, as described above, the pilot valve 2 includes the first electromagnetic drive unit 80 and the second electromagnetic drive unit 90, and one plunger spring 78. Specifically, the pilot valve 2 has a structure in which a W coil using the first electromagnetic coil 84 and the second electromagnetic coil 94 and a plunger spring 78 are provided to bias the plunger unit 70 toward the first electromagnetic drive unit 80 side on the second plunger 76 side. In the structure including such a W coil and a one-side plunger spring 78, the pressing force for pressing the first plunger 73 against the first attracting member 81 and the pressing force for pressing the second plunger 76 on the side provided with the plunger spring 78 against the second attracting member 91 are the same, and can be represented by a pressing force R. In addition, in order to move the second plunger 76 toward the second attracting member 91 and press it against the second attracting member 91, it is necessary to resist the acting force Q of the plunger spring 78, and therefore an attractive force greater than the attractive force P1 between the first plunger 73 and the first attracting member 81 described above is required.

[0082] Specifically, for example, if the attraction force obtained by the magnetic force generated between the first attraction member 81 and the first plunger 73 is set to P1 as described above, the force of the plunger spring is set to Q, and the attraction force obtained by the magnetic force generated between the second attraction member 91 and the second plunger 76 is set to P2, then the pressing force pressing the first plunger 73 to the first attraction member 81 becomes R=P1+Q, and on the other hand, the pressing force pressing the second plunger 76 to the second attraction member 91 becomes R=P2-Q. Therefore, P2-P1=2Q, and the attraction force P2 needs to be at least twice greater than the force Q than the attraction force P1. In this case, it is considered to increase the number of turns of the second winding 96 of the second electromagnetic coil 94, increase the driving power, etc., but accordingly, the second electromagnetic coil 94 is enlarged or the cost for driving is increased.

[0083] However, according to this structure, the area of ​​the second adsorption surface B is made larger than the area of ​​the first adsorption surface A, for example, it is easy to make the attraction force P2 generated between the second attraction member 91 and the second plunger 76 larger than the attraction force P1 generated between the first attraction member 81 and the first plunger 73. In addition, in addition to this, the area of ​​the second adsorption portion b1 is made larger than the area of ​​the first adsorption portion a1, so that it is easier to obtain an attraction force P2 larger than the attraction force P1. As a result, the attraction force P2 can be increased by at least twice the force Q of the plunger spring 78, and there is no need to enlarge the second electromagnetic coil 94 and increase the driving power in order to obtain the attraction force P2.

[0084] In addition, in this structure, the area of ​​the first adsorption surface A, the area of ​​the second adsorption surface B, the area of ​​the first adsorption part a1 or the area of ​​the second adsorption part b1, etc. are adjusted in a manner balanced with the spring load of the plunger spring 78, so that the pressing force R of the first plunger 73 against the first attraction member 81 and the pressing force R of the second plunger 76 against the second attraction member 91 can be made the same. As a result, the first electromagnetic coil 84 and the second electromagnetic coil 94 can be shared, and the first attraction member 81 and the second attraction member 91 can be shared. Therefore, the manufacturing cost of the first electromagnetic drive unit 80 and the second electromagnetic drive unit 90 can be reduced. In addition, the sharing of the first electromagnetic coil 84 and the second electromagnetic coil 94 and the sharing of the first attraction member 81 and the second attraction member 91 are not necessary, and they may not necessarily be shared.

[0085] As described above, according to the above-mentioned embodiment, since the second plunger 76 has a circumferential surface shape in which the area slidably guided by the inner circumferential surface of the valve body 30 is larger than that of the first plunger 73, the second plunger 76 can ensure a sliding area of ​​an appropriate size relative to the valve body 30, and the stability of the switching action of the valve core 50 can be improved. In addition, by providing the plunger spring 78, the first plunger 73, the second plunger 76, and the valve core holding portion 71 can be moved to the first attracting member 81 side by the force Q, and the state of pressing in the same direction can be maintained. Therefore, even when the power is not supplied, the vibration of the plunger portion 70 can be suppressed. Therefore, it is possible to provide a pilot valve 2 (sliding type switching valve) that can suppress the vibration of the plunger portion 70 (plunger) and improve the stability of the switching action. In addition, by providing the plunger spring 78, the driving force of the first electromagnetic drive portion 80 that attracts the first plunger 73 can be reduced by the amount of the force Q of the plunger spring 78. Therefore, the first electromagnetic drive unit 80 can be miniaturized and the operating voltage of the first electromagnetic drive unit 80 can be reduced, which can contribute to miniaturization or cost reduction of the pilot valve 2 .

[0086] In addition, according to the present embodiment, the inner peripheral surface of the valve body 30 can be used to slide and guide the substantially entire circumference of the outer peripheral surface of the second plunger 76, and the second plunger 76 can be used to partially suppress the inclination of the plunger portion 70, suppress the locking of the plunger portion 70, etc. Therefore, the stability of the switching action of the valve core 50 can be further improved.

[0087] In addition, according to the present embodiment, the first plunger 73 can be moved in a state where the facing surface 74a of the flat portion 74 faces the valve seat surface 41. In addition, in this structure, since a space of at least the height from the inner peripheral surface of the valve body 30 to the valve seat surface 41 is generated between the first plunger 73 and the inner peripheral surface of the valve body 30, the valve seat member 40 can also be arranged using this space. Therefore, it is not necessary to prepare a special space for arranging the valve seat member 40 in the valve body 30, and accordingly, it is possible to prevent the valve body 30 from being enlarged.

[0088] In addition, according to the present embodiment, the area of ​​the right end face D of the second plunger 76 (the end face opposite to the second suction member 91) is made larger than the area of ​​the left end face C of the first plunger 73 (the end face opposite to the first suction member 81), so that it is easy to obtain a pressing force R between the second plunger 76 and the second suction member 91 to resist the action force Q of the plunger spring 78 and press the second plunger 76 toward the second suction member 91, thereby improving the stability of the switching action of the valve core 50.

[0089] In addition, according to the present embodiment, the first through hole 75 is provided in the first plunger 73, so that when the first plunger 73 is adsorbed on the first attracting member 81, the first adsorption surface A and the end portion on the right side of the first attracting member 81 are connected to the valve chamber 31 via the outer peripheral surface of the first plunger 73. Therefore, it is possible to prevent the first plunger 73 and the first attracting member 81 from becoming a vacuum state, and it is possible to prevent the first plunger 73 from being attached to the first attracting member 81. In addition, since it is possible to prevent the first plunger 73 from being attached to the first attracting member 81, a large driving force is not required when driving the second plunger 76, and it is possible to prevent the second electromagnetic coil 94 from being enlarged.

[0090] In addition, according to the present embodiment, since the first through hole 75 penetrates the plane portion 74, when the first plunger 73 is adsorbed on the first suction member 81, the first adsorption surface A and the right end surface of the first suction member 81 are communicated with the valve chamber 31 via the plane portion 74. Therefore, it is possible to prevent the first plunger 73 and the first suction member 81 from becoming a vacuum state, and it is possible to prevent the first plunger 73 from being attached to the first suction member 81. In addition, the portion where the plane portion 74 is located is a portion of the valve chamber 31 where a space is generated between the first plunger 73 and the inner peripheral surface of the valve body 30 as described above. Therefore, by setting the above space as the communication destination of the first through hole 75, when the first plunger 73 abuts on the first suction member 81, it is possible to easily and reliably communicate between the first adsorption surface A and the right end surface of the first suction member 81 and the valve chamber 31, and it is possible to further achieve suppression of the vacuum state.

[0091] According to the present embodiment, the plunger spring 78 can be inserted into the insertion hole 77 and accommodated in the second plunger 76, which can contribute to space saving of the valve body 30. Thus, the pilot valve 2 can be miniaturized.

[0092] In addition, according to the present embodiment, the second through hole 79 is provided in the second plunger 76, so that when the second plunger 76 abuts against the second suction member 91, the second adsorption surface B and the left end surface of the second suction member 91 are connected to the valve chamber 31 via the outer peripheral surface of the second plunger 76. Therefore, it is possible to prevent the second plunger 76 and the second suction member 91 from becoming a vacuum state, and prevent the second plunger 76 from being attached to the second suction member 91.

[0093] In addition, according to the present embodiment, when the first plunger 73 abuts against the first attracting member 81, the first adsorption surface A and the right end surface of the first attracting member 81 are connected to the valve chamber 31 via the outer peripheral surface of the first plunger 73, thereby preventing the first plunger 73 and the first attracting member 81 from becoming a vacuum state, and preventing the first plunger 73 from being attached to the first attracting member 81. In addition, by inserting the plunger spring 78 into the insertion hole 77, the plunger spring 78 can be stored in the second plunger 76, which can contribute to space saving of the valve body 30.

[0094] In addition, according to the present embodiment, since the area of ​​the second adsorption surface B is made larger than the area of ​​the first adsorption surface A, for example, the attraction force P2 generated between the second attraction member 91 and the second plunger 76 can be made larger than the attraction force P1 generated between the first attraction member 81 and the first plunger 73 by at least twice the force Q of the plunger spring 78. Therefore, it is not necessary to enlarge the second electromagnetic coil 94 or increase the driving power in order to obtain the attraction force P2 larger than the attraction force P1. In addition, in this structure, the area of ​​the second adsorption surface B is adjusted in a manner balanced with the spring load of the plunger spring 78, so that the pressing force R of pressing the first plunger 73 against the first attraction member 81 and the pressing force R of pressing the second plunger 76 against the second attraction member 91 can be made the same. As a result, the first electromagnetic coil 84 and the second electromagnetic coil 94 can be shared, and the first attraction member 81 and the second attraction member 91 can be shared. Therefore, the manufacturing cost of the first electromagnetic drive unit 80 and the second electromagnetic drive unit 90 can also be reduced. Therefore, it can contribute to the miniaturization and cost reduction of the pilot valve 2. In addition, the commonality of the first electromagnetic coil 84 and the second electromagnetic coil 94 and the commonality of the first attracting member 81 and the second attracting member 91 are not essential and they do not necessarily need to be commonality.

[0095] In addition, according to the present embodiment, the first end hole portion 75a constituting the first through hole 75 and the first mounting hole 82 (mounting hole) of the first attracting member 81 are coaxially arranged, so that it is easy to form a magnetic circuit M around the first electromagnetic coil 84, and the magnetic circuit M does not pass through the space such as the first end hole portion 75a and the first mounting hole 82, but is continuous in the axis X direction through the first outer case 88, the first attracting member 81 and the first plunger 73, and the attraction force between the first attracting member 81 and the first plunger 73 can be increased. In addition, by coaxially arranging the insertion hole 77 of the second plunger 76 and the second mounting hole 92 of the second attracting member 91, it is easy to form a magnetic circuit around the second electromagnetic coil 94, and the magnetic circuit does not pass through the space such as the insertion hole 77 and the second mounting hole 92, but is continuous in the axis X direction through the second outer case 98, the second attracting member 91 and the second plunger 76, and the magnetic force between the second attracting member 91 and the second plunger 76 can be increased.

[0096] In addition, according to the present embodiment, the first adsorption portion a1 is a portion that forms a magnetic circuit M that is continuous in the axis X direction through the first attraction member 81 and the first plunger 73 without passing through a space such as the first mounting hole 82, and is a portion of the first adsorption surface A where the magnetic force is likely to become larger than a portion of the space such as the first mounting hole 82. In addition, the second adsorption portion b1 is a portion that forms a magnetic circuit that is continuous in the axis X direction through the second attraction member 91 and the second plunger 76 without passing through a space such as the second mounting hole 92, and is a portion of the second adsorption surface B where the magnetic force is likely to become larger than a portion of the space such as the second mounting hole 92. And, according to the present structure, in the portion where the magnetic force is larger than the other portions, the area of ​​the second adsorption portion b1 is larger than the area of ​​the first adsorption portion a1, so it is easier to obtain an attractive force P2 that is larger than the above-mentioned attractive force P1. Therefore, it is not necessary to enlarge the second electromagnetic coil 94 and increase the driving power in order to obtain the attractive force P2.

[0097] According to the present embodiment, the valve body 30 may be configured such that the central valve body 32 , the first plunger tube 36 , and the second plunger tube 37 , which are separately provided, are integrated into one body.

[0098] Furthermore, according to the present embodiment, the refrigeration cycle system 100 can be configured using the pilot valve 2 which can suppress the vibration of the plunger portion 70 and improve the stability of the switching operation.

[0099] Next, a first modified example of the pilot valve 2 will be described. Figure 5 2 is a cross-sectional view of the pilot valve 200 (sliding type switching valve) in the first modified example cut along the axis X direction of the valve body 210. The pilot valve 200 includes a valve body 210. The valve body 210 is formed by stamping a metal material such as stainless steel into an integral plunger tube 220 in an overall circular tubular shape. The valve body 210 is equivalent to the valve body 30 in the above-mentioned embodiment, but the valve body 30 is formed as a whole by the central valve body 32, the first plunger tube 36 and the second plunger tube 37, which are separated from each other, and the valve body 210 is composed of a separate component, which is different.

[0100] A capillary mounting hole 34 extending in the radial direction and a valve seat mounting hole 35 extending in the radial direction opposite to the capillary mounting hole 34 are formed in the middle portion of the plunger tube 220 by flanging or the like. One end of the D capillary tube 34a as a high-pressure pipe is fixed in the capillary mounting hole 34 by brazing or the like in an inserted state. The valve seat component 40 is embedded in the valve seat mounting hole 35. A first suction piece 81 is fixed to the inner circumference of the left end portion (the end portion on one side in the direction of the axis X) of the plunger tube 220 by welding or the like. In addition, a second suction piece 91 is fixed to the inner circumference of the right end portion (the end portion on the other side in the direction of the axis X) of the plunger tube 220 by welding or the like.

[0101] According to such a first modified example, the valve body 210 can be formed by the plunger tube 220 which is an integral cylindrical tube, that is, a single component. Therefore, the number of components of the valve body 210 can be reduced, which contributes to cost reduction. In addition, since the valve body 210 is formed by a single component, it is easy to prevent the axial deviation of the plunger tube 220, and the sliding friction of the plunger part 70 moving forward and backward in the plunger tube 220 relative to the valve body 210 can be suppressed. Thus, even if the driving force in the first electromagnetic drive part 80 and the second electromagnetic drive part 90 is not increased, the plunger part 70 can be moved forward and backward smoothly, so it can contribute to the miniaturization of the first electromagnetic drive part 80 and the second electromagnetic drive part 90. In addition, the sliding friction of the plunger part 70 can be suppressed, so the generation of abnormal sound in the valve body 210 can be suppressed.

[0102] Next, a second modification of the pilot valve 2 will be described. Figure 6 (A) is a cross-sectional view of the plunger portion 300 in the second modified example cut along the axis X direction of the valve body 30, (B) is a front view of the first plunger 310 in the second modified example, Figure 6 (C) is a front view of the second plunger 312 in the second modified example. The plunger portion 300 includes: a first plunger 310 provided continuously with the left end portion of the valve core holding portion 71; and a second plunger 312 provided continuously with the right end portion of the valve core holding portion 71. The first plunger 310 is equivalent to the first plunger 73 of the above-mentioned embodiment. A flat surface portion 74, i.e., a D-shaped cut surface, which is the same as the above-mentioned first plunger 73, is formed on the lower surface of the first plunger 310.

[0103] like Figure 6 As shown in (B), a first open groove 311 is formed on the left end surface C of the first plunger 310, and the first open groove 311 is recessed along the axis X direction and extends in a direction intersecting the axis X direction. The first open groove 311 is continuous with the plane portion 74, whereby the first plunger 310 and the first suction member 81 are connected to the valve chamber 31. In addition, in this modified example, the end surface of the left end surface C of the first plunger 310 other than the portion where the first open groove 311 is formed and the portion where the plane portion 74 is formed constitutes the first adsorption surface A. The second plunger 312 is equivalent to the second plunger 76 of the above-mentioned embodiment. As Figure 6 As shown in FIG. 2 (C), a second open groove 313 is formed on the right end surface D of the second plunger 312 .

[0104] The second open groove 313 includes: a first groove 314 extending in a direction intersecting the axis X direction; and a second groove 315 that is continuous with the lower end of the first groove 314 and extends along the lower surface of the second plunger 312 in the axis X direction. Due to the formation of the second open groove 313, the second plunger 312 and the second suction member 91 are connected to the valve chamber 31. In addition, in this modified example, the end surface D of the right side of the second plunger 312, except for the portion where the second open groove 313 is formed, constitutes the second adsorption surface B.

[0105] According to the second modified example, the first open groove 311 is provided in the first plunger 310, so that when the first plunger 310 is adsorbed by the first suction member 81, the first adsorption surface A and the right end of the first suction member 81 are connected to the valve chamber 31 via the first open groove 311. Therefore, it is possible to prevent the first plunger 310 and the first suction member 81 from becoming a vacuum state, and it is possible to prevent the first plunger 310 from being attached to the first suction member 81. In addition, it is possible to prevent the first plunger 310 from being attached to the first suction member 81, so that a large driving force is not required when driving the second plunger 312, and it is possible to prevent the second electromagnetic coil 94 from being enlarged. In addition, due to the simple structure of forming the first open groove 311, it is possible to prevent the first plunger 310 from being attached to the first suction member 81, so that compared with the structure of forming the first through hole 75, the plunger part 300 can be manufactured more easily.

[0106] In addition, since the second open groove 313 is provided in the second plunger 312, when the second plunger 312 abuts against the second suction piece 91, the second suction surface B and the left end surface of the second suction piece 91 are connected to the valve chamber 31 via the second open groove 313. Therefore, it is possible to prevent the second plunger 312 and the second suction piece 91 from becoming a vacuum state, and it is possible to prevent the second plunger 312 from being attached to the second suction piece 91. In addition, since it is possible to prevent the second plunger 312 from being attached to the second suction piece 91, it is not necessary to use a large driving force when driving the first plunger 310, so that it is possible to prevent the first electromagnetic coil 84 from being enlarged. In addition, due to the simple structure of forming the second open groove 313, it is possible to prevent the second plunger 312 from being attached to the second suction piece 91, and thus it is possible to easily manufacture the plunger part 300 compared with the structure of forming the second through hole 79.

[0107] In addition, the above-described embodiments are merely representative embodiments of the present invention, and the present invention is not limited thereto. That is, various modifications can be made and implemented without departing from the scope of the present invention. According to the modification, as long as the structure of the pilot valve 2 (sliding switching valve) of the present invention is provided, it is of course also included in the scope of the present invention.

[0108] For example, in the present embodiment and the modified example, as an example of a sliding switching valve, a pilot valve 2 is illustrated in which a driving fluid moves a sliding valve core 20 of a four-way valve 1 for switching the connection state of four pipes and circulates between the four-way valve 1. However, the present invention can also be directly applied to the four-way valve 1, for example. In addition, the sliding switching valve is not limited to these four-way valves 1 and pilot valves 2. The sliding switching valve can be a two-way valve that uses a valve core to switch between two pipes, for example, it can also be a three-way valve that uses a valve core to switch the pipes of the connection object when a pair of pipes among three pipes are connected. Alternatively, it can also be a multi-way valve that further increases the number of pipes of the connection object. In this way, the number of pipes in the sliding switching valve and the method of switching the connection state can also be changed according to the application object of the sliding switching valve, etc.

[0109] In addition, in the present embodiment, the maximum outer diameter γ of the first plunger 73 and the maximum outer diameter σ of the second plunger 76 are set to be the same, and the flat surface portion 74 is formed on the first plunger 73, so that the area of ​​the right end surface D of the second plunger 76 is larger than the area of ​​the left end surface C of the first plunger 73. However, these maximum outer diameters γ, σ or diameters may be different from those in the present embodiment. In addition, the present invention can also be applied to a structure in which an opening such as the first end hole portion 75a and a plane such as the flat surface portion 74 are not formed on the left end surface C of the first plunger 73, and a structure in which an opening such as the insertion hole 77 and the second end hole portion 79a are not formed on the right end surface D of the second plunger 76. In either case, as in the present embodiment, by making the area of ​​the right end face D of the second plunger 76 larger than the area of ​​the left end face C of the first plunger 73, it is easy to obtain a pressing force R between the second plunger 76 and the second attraction member 91 to resist the force Q of the plunger spring 78 and press the second plunger 76 toward the second attraction member 91, thereby improving the stability of the switching action of the valve core 50.

[0110] In addition, in the present embodiment, the area of ​​the second adsorption surface B in the second plunger 76 is set to be larger than the area of ​​the first adsorption surface A in the first plunger 73. Therefore, as described above, the areas of the first adsorption surface A and the second adsorption surface B vary according to the opening areas of the first end hole portion 75a and the second end hole portion 79a, the size of the width direction Y of the plane portion 74, etc., and also vary according to the relationship with the area of ​​the end surface of the first suction member 81 and the second suction member 91 of the adsorption object. Therefore, the area of ​​the second adsorption surface B may be equal to the area of ​​the first adsorption surface A, or the area of ​​the second adsorption surface B may be smaller than the area of ​​the first adsorption surface A. However, from the viewpoint of making it easy to make the attraction force P2 larger than the attraction force P1, it is preferable to make the area of ​​the second adsorption surface B larger than the area of ​​the first adsorption surface A as in the above-mentioned embodiment.

[0111] In addition, in the present embodiment, the plunger spring 78 is housed in the insertion hole 77, and the plunger portion 70 (i.e., the first plunger 73, the valve core holding portion 71, and the second plunger 76) is urged toward the first attracting member 81 by the action force Q of the plunger spring 78. However, the configuration and the force direction of the plunger spring 78 are not limited thereto. For example, the plunger spring 78 may be provided in a portion other than the insertion hole 77 in the second plunger 76 to urge the plunger portion 70 toward the first attracting member 81 side. In addition, the plunger spring 78 may also be provided on the first plunger 73 side to urge the plunger portion 70 toward the second attracting member 91 side.

[0112] In this case, the plunger portion 70 can also be moved toward the second attractor 91 side, and the state of being pressed in the same direction can be maintained, thereby suppressing the vibration of the plunger portion 70. In addition, the driving force of the second electromagnetic drive portion 90 that attracts the second plunger 76 can be reduced by the amount of the force Q of the plunger spring 78. Therefore, the second electromagnetic drive portion 90 can be miniaturized, the operating voltage of the second electromagnetic drive portion 90 can be reduced, etc. In this way, unlike the above-mentioned embodiment and modified example, the plunger spring 78 can also be set to apply force to the first plunger 73, the second plunger 76 and the valve core holding portion 71 toward the second attractor 91. In addition, when the plunger spring 78 is used to apply force to the plunger portion 70 toward the second suction member 91 side, it is easy to obtain a pressing force between the first plunger 73 and the first suction member 81 to resist the force of the plunger spring 78 and press the first plunger 73 toward the first suction member 81. Therefore, contrary to the above-mentioned embodiment and modified example, the area of ​​the left end face C of the first plunger 73 can also be made larger than the area of ​​the right end face D of the second plunger 76.

Claims

1. A sliding switching valve, comprising: a valve body having a valve chamber inside; a valve seat portion, which is provided on the valve body and has a plurality of valve ports; a valve core, which is slidably provided on a valve seat surface of the valve seat portion; a valve core holding portion, which holds the valve core; a first plunger and a second plunger, which are provided to be able to move forward and backward in the valve body integrally with the valve core holding portion; and a first electromagnetic drive portion and a second electromagnetic drive portion, which drive the valve core holding portion, the first plunger and the second plunger along the axial direction of the valve body, The above-mentioned sliding type switching valve is characterized in that: The first electromagnetic driving unit comprises a first attracting member and a first electromagnetic coil. The second electromagnetic driving unit comprises a second attracting member and a second electromagnetic coil. The second plunger has a peripheral surface shape having a larger area than that of the first plunger and being slidably guided by the inner peripheral surface of the valve body. A plunger spring is provided in the valve chamber, and the plunger spring urges the first plunger, the second plunger, and the valve body holding portion toward the first attractor or the second attractor.

2. The sliding switching valve according to claim 1, characterized in that: The second plunger has a cylindrical outer peripheral surface which is slidably guided by the inner peripheral surface of the valve body over substantially the entire circumference.

3. The sliding switching valve according to claim 2, characterized in that: The first plunger includes a flat surface portion having an opposing surface facing the valve seat surface of the valve seat portion.

4. The sliding switching valve according to claim 3, characterized in that: The plunger spring urges the first plunger, the second plunger, and the valve body holding portion toward the first attractor.

5. The sliding switching valve according to claim 4, characterized in that: An area of ​​an end surface of the second plunger facing the second suction member is larger than an area of ​​an end surface of the first plunger facing the first suction member.

6. The sliding switching valve according to claim 4, characterized in that: The first plunger has a first through hole extending from an end surface facing the first suction member to an outer peripheral surface.

7. The sliding switching valve according to claim 6, characterized in that: The first through hole penetrates from the end surface facing the first attracting member to the flat surface.

8. The sliding switching valve according to claim 4, characterized in that: The second plunger has an insertion hole into which the plunger spring is inserted. The insertion hole is formed recessed from an end surface facing the second attracting member.

9. The sliding switching valve according to claim 4, characterized in that: The second plunger has a second through hole extending from an end surface facing the second suction member to an outer peripheral surface.

10. The sliding switching valve according to claim 4, characterized in that: The first plunger has a first through hole extending from an end surface facing the first suction member to an outer peripheral surface. The second plunger has an insertion hole into which the plunger spring is inserted. The insertion hole is formed recessed from an end surface facing the second attracting member.

11. The slide-type switching valve according to any one of claims 4, 6 to 10, characterized in that: An area of ​​a second adsorption surface of the second plunger that contacts the second suction member is larger than an area of ​​a first adsorption surface of the first plunger that contacts the first suction member.

12. The slide-type switching valve according to any one of claims 4, 6, 8 to 10, characterized in that: The first electromagnetic drive unit includes a first outer box covering the first electromagnetic coil. The first through hole of the first plunger extending from the end surface opposite to the first suction member to the outer peripheral surface comprises: a first end hole portion opening at the end surface opposite to the first suction member; and a first outer peripheral hole portion communicating with the first end hole portion and opening at the outer peripheral surface of the first plunger, The first suction member has a first mounting hole on the end surface, and a fixing member for fixing the first outer box is inserted into the first mounting hole. The first end hole is coaxially arranged with the first mounting hole. The second electromagnetic drive unit includes a second outer box covering the second electromagnetic coil. The second plunger has an insertion hole into which the plunger spring is inserted. The second suction member has a second mounting hole on the end surface, and a fixing member for fixing the second outer box is inserted into the second mounting hole. The insertion hole is coaxially arranged with the second mounting hole.

13. The sliding switching valve according to claim 12, characterized in that: If the first suction surface of the first plunger that contacts the first suction member is a portion other than a portion where the first mounting hole is projected along the axial direction as the first suction portion, The second suction surface of the second plunger that contacts the second suction member is a portion other than a portion where the second mounting hole is projected along the axial direction as a second suction portion. Then, the area of ​​the second adsorption portion is larger than the area of ​​the first adsorption portion.

14. The sliding switching valve according to claim 1, characterized in that: The valve body includes a central valve body provided with the valve seat portion, a first plunger tube connected to one side of the central valve body in the axial direction, and a second plunger tube connected to the other side of the central valve body in the axial direction.

15. The sliding switching valve according to claim 1, characterized in that: The above-mentioned valve body is composed of an integrally circular tubular plunger tube, the above-mentioned valve seat portion is installed in the middle portion of the above-mentioned plunger tube, the above-mentioned first suction member is fixed to the end portion on one side of the above-mentioned axial direction of the above-mentioned plunger tube, and the above-mentioned second suction member is fixed to the end portion on the other side of the above-mentioned axial direction of the above-mentioned plunger tube.

16. A refrigeration cycle system, characterized in that: A sliding switching valve according to claim 1 is provided.

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