Slide type switching valve and refrigeration cycle system

Abstract

To provide a slide type switching valve and a refrigeration cycle system which can suppress malfunctions, and to provide a refrigeration cycle system.SOLUTION: A slide type switching valve 1 has: a valve body 2; a valve seat part 3; a valve element 4; an electromagnetic drive part 5; and joint members 61 to 64. A plunger 51 comes into contact with a closing part 22 to be restricted from moving and thereby suppress damage caused to the valve seat part 3 and the surroundings thereof, eliminating the need to additionally provide a stopper. A cylindrical section 21 of the valve body 2 forms a valve chamber forming section and a plunger accommodating section, and the structure can prevent errors in relative positions that may occur if these sections are formed by separate members. Thus, valve ports 32A to 32C can be opened / closed normally and easily by the valve element 4, and malfunctions can be suppressed.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a slide type switching valve and a refrigeration cycle system. [Background technology]

[0002] Generally, a switching valve is known in which a valve body is moved by an electromagnetic drive unit having a solenoid coil to open and close a valve port formed on a valve seat surface to switch a fluid flow path. As such a switching valve, one configured as a pilot valve for driving a four-way switching valve in a refrigeration cycle system has been proposed (see, for example, Patent Document 1). In the switching valve described in Patent Document 1, when the electromagnetic coil in the electromagnetic drive unit is energized, the plunger moves toward the attractor, and when the current is cut off, the plunger moves away from the attractor due to the biasing force of the coil spring, and the flow path is switched by switching between energization and de-energization. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-42882 A Summary of the Invention [Problem to be solved by the invention]

[0004] In order for the valve disc to normally open and close the port when the current is cut off as described above, it is necessary to restrict the movement of the plunger at a certain position when it moves away from the suction object. In a configuration in which the movement of the plunger is restricted by abutting against the valve seat member (a member in which the valve port is formed), it is easy to make the relative position of the valve disc and the valve port accurate, but if a collision causes deformation or wear of the valve seat member, or if a load is applied to the joint between the valve seat member and the valve body (plunger tube), this can cause operational problems, so a stronger joint is required.

[0005] On the other hand, when a stopper is added in addition to the valve seat member, an error in the mounting position or formation position of the stopper may cause an error in the relative position between the valve body and the port. In other words, an increase in the number of parts and components may reduce accuracy. If an error occurs in the relative position between the valve body and the port, the valve body may not be able to open or close the port normally, and malfunctions may occur. In this way, it has been difficult to suppress malfunctions of the switching valve in both cases where the plunger is regulated by the valve seat member and where it is regulated by an additional member.

[0006] An object of the present invention is to provide a slide type switching valve and a refrigeration cycle system capable of suppressing malfunctions. [Means for solving the problem]

[0007] The slide type switching valve of the present invention is a slide type switching valve including: a valve body forming a valve chamber; a valve seat portion having a valve seat surface on which at least one valve port is formed and provided within the valve chamber; a valve body that opens and closes the valve port relative to the valve chamber by sliding against the valve seat surface; and an electromagnetic drive unit that moves the valve body in a sliding direction along the valve seat surface, the electromagnetic drive unit including a plunger that extends along the sliding direction and to which the valve body is connected, an attractor that is disposed on one side of the plunger in the sliding direction, and a coil that excites the attractor. and a biasing means for biasing the plunger to the other side in the sliding direction, and is configured to move the plunger to the one side when an electric current is applied, the valve body integrally comprises a valve chamber forming portion that forms the valve chamber, and a plunger accommodating portion that accommodates the plunger and guides it in the sliding direction and in which the suction element is provided, and when the electromagnetic drive unit is in a non-energized state, the plunger abuts against a blocking portion that blocks the valve chamber from the other side in the valve chamber forming portion, thereby restricting movement of the plunger to the other side.

[0008] According to the present invention as described above, the plunger abuts against the occlusion portion of the valve chamber forming portion to restrict its movement, so that it does not collide with the valve seat portion, and damage to the valve seat portion and its surroundings can be suppressed. Furthermore, the occlusion portion is a necessary portion for forming the valve chamber, and there is no need to provide an additional stopper. For example, if the plunger is extended to the other side to abut against the occlusion portion, or if the occlusion portion is made thick and abuts against the plunger, the error in the relative position between the valve port and the valve body can be reduced compared to the case where a stopper is additionally provided. This makes it easier for the valve body to open and close the valve port normally, and prevents malfunctions.

[0009] In addition, by integrating the valve chamber forming portion of the valve body that forms the valve chamber and the plunger accommodating portion that accommodates the plunger, it is possible to suppress errors in the relative positions that may occur when these are separate. In other words, it is possible to suppress errors in the relative positions of the plunger and the attractor, and to facilitate normal drive of the plunger by magnetic force. As described above, it is possible to suppress the increase in the number of parts and additional configurations while suppressing damage to the valve seat portion and its surroundings, thereby suppressing malfunctions of the slide type switching valve.

[0010] In this case, in the slide type switching valve of the present invention, it is preferable that the valve chamber forming portion has an attachment opening formed on a side surface of a cylindrical portion, the valve seat portion is formed separately from the valve body, and has a small diameter portion having an outer diameter smaller than the inner diameter of the attachment opening, and a large diameter portion having an outer diameter larger than the inner diameter of the attachment opening and provided on the opposite side of the valve seat surface from the small diameter portion, and that the small diameter portion is inserted into the attachment opening and the insertion is regulated by the large diameter portion.

[0011] With this configuration, the large diameter portion restricts the insertion of the valve seat, thereby suppressing error in the relative position between the valve body and the valve seat in the insertion direction. That is, error in the position of the valve seat surface in the valve chamber in the insertion direction can be suppressed, making it easier for the valve body to slide normally relative to the valve seat surface.

[0012] Furthermore, in the slide type switching valve of the present invention, it is preferable that an attachment opening is formed on a side surface of a cylindrical portion of the valve chamber forming portion, the valve seat portion is formed separately from the valve body and is attached to the valve body by being inserted into the attachment opening, one of the other side end portion and the one side end portion of the valve seat portion contacts an inner circumferential surface of the attachment opening, the other forms a gap portion between the inner circumferential surface, and a fixing material is provided in the gap portion.

[0013] According to this configuration, the valve seat can be fixed based on one of the ends of the inner circumferential surface of the mounting opening in the sliding direction, and the error in the relative position between the valve body and the valve seat in the sliding direction can be suppressed. As described above, the plunger abuts against a part of the valve body, and the error in the relative position between the valve body and the plunger in the sliding direction is suppressed. Therefore, the error in the relative position between the plunger and the valve seat in the sliding direction can be suppressed, and the error in the relative position between the valve body and the valve port can be suppressed, and malfunctions of the sliding type switching valve can be suppressed.

[0014] In the slide type switching valve of the present invention, it is preferable that the plunger has a flat end face on the other side and the end face is in planar contact with the blocking portion. With this configuration, the contact area is increased to distribute the load during a collision, thereby suppressing deformation and damage due to the collision and suppressing malfunction of the slide type switching valve.

[0015] In the slide type switching valve of the present invention, it is preferable that the plunger has a concave holding portion that opens to the valve seat surface side, and the valve body is disposed and held within the holding portion. With this configuration, the valve body can be directly held by the plunger, and no dedicated parts are required for holding. This makes it possible to suppress dimensional errors and relative position errors that may occur due to dedicated parts, and to suppress malfunctions of the slide type switching valve.

[0016] In addition, the sliding type switching valve of the present invention preferably includes a pipe portion connected to the valve chamber forming portion, and the valve chamber forming portion has a cylindrical protruding connection portion at a position opposite to the valve port, protruding toward the outside of the valve chamber and inserted into the inside of the pipe portion. With this configuration, the protruding connection portion can ensure the contact area between the valve chamber forming portion and the pipe portion, and the fixing strength can be improved when joining them by brazing, for example. In this case, there is no need to use a separate part to ensure the contact area, and an increase in the number of parts can be suppressed.

[0017] In the slide type switching valve of the present invention, at least three valve ports are formed on the valve seat surface, and two of the at least three valve ports are connected to respective spaces sandwiching a piston that moves a slide valve in a four-way switching valve provided in a refrigeration cycle system, and the electromagnetic drive unit may move the plunger to introduce high-pressure fluid into one of the spaces sandwiching the piston, thereby moving the slide valve by differential pressure. With this configuration, the four-way switching valve can be operated normally by suppressing the above-mentioned malfunctions.

[0018] The refrigeration cycle system of the present invention is characterized by comprising a compressor for compressing a refrigerant which is a fluid, a first heat exchanger functioning as a condenser in a cooling mode, a second heat exchanger functioning as an evaporator in a cooling mode, an expansion means for expanding and reducing the pressure of the refrigerant between the first heat exchanger and the second heat exchanger, the above-mentioned slide type switching valve, and the above-mentioned four-way switching valve. According to the refrigeration cycle system of the present invention, as described above, malfunctions of the slide type switching valve can be suppressed, and malfunctions of the entire cycle can be suppressed.

[0019] The slide type switching valve of the present invention is a slide type switching valve comprising: a valve body forming a valve chamber; a valve seat portion having a valve seat surface on which at least one valve port is formed and provided within the valve chamber; a valve body that opens and closes the valve port relative to the valve chamber by sliding against the valve seat surface; and an electromagnetic drive portion that moves the valve body in a sliding direction along the valve seat surface, wherein the valve body has a cylindrical portion that extends along the sliding direction and in which the valve seat portion is provided, and the cylindrical portion has a protruding connection portion at a position opposite the valve port, which protrudes cylindrically toward the outside of the valve chamber and is inserted into the inside of a tube portion to be connected to the tube portion.

[0020] According to the present invention as described above, the protruding connection portion ensures a contact area between the valve body and the tube portion, and improves the fixing strength when joining them by brazing, for example. In this case, there is no need to use a separate part to ensure the contact area, and an increase in the number of parts can be suppressed. Effect of the Invention

[0021] According to the slide type switching valve and the refrigeration cycle system of the present invention, malfunctions can be suppressed. [Brief description of the drawings]

[0022] [Figure 1] 1 is a schematic configuration diagram of a refrigeration cycle provided with a slide-type switching valve according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a cross-sectional view showing the slide type switching valve. [Diagram 3] FIG. 4 is a bottom view showing a valve seat portion of the slide type switching valve. [Figure 4] 2 is an enlarged cross-sectional view showing a main part of the slide type switching valve. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] An embodiment of the present invention will be described with reference to the drawings. The slide type switching valve 1 of this embodiment is provided in, for example, a refrigeration cycle 100. The refrigeration cycle 100 is used in air conditioners such as room air conditioners, packaged air conditioners, and multi-air conditioners, and includes a compressor 102 that compresses a refrigerant as a fluid, an outdoor heat exchanger 103 as a first heat exchanger that functions as a condenser in a cooling mode, an indoor heat exchanger 104 as a second heat exchanger that functions as an evaporator in a cooling mode, an expansion valve 105 as an expansion means that expands and reduces the pressure of the refrigerant between the outdoor heat exchanger 103 and the indoor heat exchanger 104, a four-way switching valve 10, and a slide type switching valve 1 that is a pilot solenoid valve that switches and controls the flow path of the four-way switching valve 10, and these are connected by a refrigerant pipe. The expansion means is not limited to the expansion valve 105, and may be a capillary.

[0024] 1, the refrigeration cycle 100 constitutes a cooling cycle in which a refrigerant flows in the order of the compressor 102, four-way switching valve 10, outdoor heat exchanger 103, expansion valve 105, indoor heat exchanger 104, four-way switching valve 10, and compressor 102. On the other hand, in a heating mode (heating operation) indicated by a dashed arrow, the refrigeration cycle 100 constitutes a heating cycle in which a refrigerant flows in the order of the compressor 102, four-way switching valve 10, indoor heat exchanger 104, expansion valve 105, outdoor heat exchanger 103, four-way switching valve 10, and compressor 102. Switching between the heating cycle and the cooling cycle is performed by the switching operation of the four-way switching valve 10 by the slide type switching valve 1.

[0025] The four-way switching valve 10 is well known and is configured to include a cylindrical valve body 11, a slide valve 12 slidably provided inside the valve body, a high-pressure side conduit (D joint) 13 communicating with the discharge port of a compressor 102, a low-pressure side conduit (S joint) 14 communicating with the suction port of the compressor 102, an indoor side conduit (E joint) 15 communicating with an indoor heat exchanger 104, and an outdoor side conduit (C joint) 16 communicating with an outdoor heat exchanger 103. The valve body 11 is configured as a totally sealed cylinder by having plugs 17, 18 that close both axial ends thereof, and spaces A11, A12 are formed to sandwich a piston 19 that moves the slide valve 12 from the axial direction.

[0026] The slide type switching valve 1 of this embodiment has a four-way switching valve configuration, and includes a valve body 2, a valve seat portion 3, a valve element 4, an electromagnetic drive portion 5, and joint members (pipe portions) 61-64, as shown in Fig. 2, and the flow path of the fluid is switched by the movement of the valve element 4 along a predetermined sliding direction. In the following, the sliding direction of the valve element 4 is defined as the X direction, and two directions perpendicular to the X direction and perpendicular to each other are defined as the Y direction and the Z direction, and the up and down in the Z direction are based on Fig. 1.

[0027] The valve body 2 is a valve housing made of, for example, brass or stainless steel, and has a valve chamber 2R inside. The valve body 2 has a cylindrical tube portion 21 extending along the X direction (the X direction is the axial direction) and a disk-shaped blocking portion 22 provided to block the tube portion 21, and is a bottomed tube, and the space inside the valve body 2 becomes the valve chamber 2R. The tube portion 21 and the blocking portion 22 are integrally formed, for example, by deep drawing of a metal sheet, and are configured as a single component. The tube portion 21 and the blocking portion 22 of the valve body 2 become a valve chamber forming portion that forms the valve chamber 2R. The open side of the tube portion 21 (the right side in FIG. 2) is one side in the X direction, and the side blocked by the blocking portion 22 (the left side in FIG. 2) is the other side in the X direction, and these may be simply referred to as one side and the other side below.

[0028] An attachment opening 211 is formed on one side in the Z direction (the lower side in FIG. 2) of the cylindrical portion 21 (i.e., the side surface of the valve body 2), and a protruding connection portion 212 is formed on the other side in the Z direction (the upper side in FIG. 2). The protruding connection portion 212 has a port 212A, and is connected to a coupling member 61 as described below.

[0029] The valve seat portion 3 is constructed separately from the valve body 2, and is formed of an appropriate metal such as stainless steel into an overall cylindrical shape extending in the Z direction. The valve seat portion 3 is inserted into the mounting opening 211 and fixed by brazing, and its upper surface, which is a valve seat surface 31, is disposed in the valve chamber 2R. As shown in Fig. 3, the valve seat portion 3 is formed with three valve ports 32A-32C opening at the valve seat surface 31, and mounting holes 33A-33C communicating with the valve ports 32A-32C, respectively. The valve seat surface 31 is a planar sliding surface extending along the XY plane.

[0030] The mounting holes 33A to 33C are through holes extending along the Z direction, and are connected to the coupling members 62 to 64, respectively. While the valve ports 32A to 32C are aligned linearly along the X direction, the mounting holes 33A to 33C are arranged in a triangle shape on the XY plane. Therefore, the mounting holes 33A to 33C are connected while being slightly offset from the valve ports 32A to 32C within the XY plane (particularly in the Y direction).

[0031] As shown in Fig. 4, the valve seat portion 3 has a main body portion 36 as a small diameter portion, and a flange portion 37 as a large diameter portion provided below the main body portion 36 (the side opposite to the valve seat surface 31). The outer peripheral surfaces of the main body portion 36 and the flange portion 37 are both cylindrical. The outer diameter of the main body portion 36 is smaller than the inner diameter of the mounting opening 211, and the outer diameter of the flange portion 37 is larger than the inner diameter of the mounting opening 211. Therefore, when the main body portion 36 is inserted into the mounting opening 211, the upper surface of the flange portion 37 abuts against the lower surface around the mounting opening 211, thereby restricting the insertion of the valve seat portion 3.

[0032] The valve element 4 is a slide valve made of, for example, synthetic resin, and is formed in a bowl shape (dome shape) opening toward the valve seat surface 31. A communication space 4R is formed inside the valve element 4, and this communication space 4R is configured to either communicate the central valve port 32B with the valve port 32A on one side and not communicate with the valve port 32C on the other side, or to communicate the central valve port 32B with the valve port 32C on the other side and not communicate with the valve port 32A on the one side.

[0033] The electromagnetic drive unit 5 has a plunger 51, an attractor 52, a coil, and a coil spring 53 as a biasing means, and slides the valve body 4 along the X direction.

[0034] The plunger 51 is made of a magnetic material and formed into a columnar shape extending along the X direction as a whole, and integrally includes a cylindrical portion 511 and a protruding portion 512 protruding from the cylindrical portion 511 to the other side. The plunger 51 is housed in the tubular portion 21 of the valve body 2, and the tubular portion 21 functions as a plunger housing portion. Therefore, the valve body 2 integrally includes a valve chamber forming portion (tubular portion 21 and closing portion 22) and a plunger housing portion (tubular portion 21). The outer diameter of the cylindrical portion 511 is equal to or slightly smaller than the inner diameter of the tubular portion 21, and the plunger 51 is guided in the X direction by the tubular portion 21.

[0035] A recess 513 for accommodating the coil spring 53 is formed at one end of the cylindrical portion 511. A pressure equalizing hole 511A is formed in the cylindrical portion 511 across both ends in the X direction, so that no pressure difference occurs between the spaces on both sides of the plunger 51 in the X direction.

[0036] The protruding portion 512 has an outer diameter smaller than that of the cylindrical portion 511, and is spaced apart from the inner peripheral surface of the tube portion 21. As shown in Fig. 4, the protruding portion 512 is formed with a concave holding portion 514 that opens towards the valve seat surface 31, and the valve body 4 is directly held by being placed in the holding portion 514. A coil spring 54 is provided between the valve body 4 and the holding portion 514 to bias the valve body 4 towards the valve seat surface 31. The protruding portion 512 has a flat end surface 515 extending along the YZ plane on the other side in the X direction.

[0037] The attractor 52 is made of a magnetic material and formed into a cylindrical shape, and is provided so as to close an opening on one side in the X direction of the tubular portion 21 of the valve body 2. That is, the attractor 52 is disposed on one side in the X direction with respect to the plunger 51. One end of the attractor 52 is joined to the tubular portion 21 by, for example, welding. The coil is provided on the outside of the tubular portion 21 so as to correspond to the attractor 52 in the X direction, and is switched between a conducting state and a non-conducting state. As a result, when the coil is in a conducting state, the attractor 52 is excited, and the plunger 51, which is a magnetic material, is attracted to the attractor 52, and moves to one side against the biasing force of the coil spring 53, which will be described later.

[0038] The coil spring 53 is provided between the plunger 51 and the attractor 52, with one end contacting the attractor 52 and the other end housed in the recess 513. This causes the coil spring 53 to bias the plunger 51 to the other side. When the coil is de-energized, the attractor 52 no longer generates an attractive force, and the plunger 51 moves to the other side due to the biasing force of the coil spring 53. In this way, the electromagnetic drive unit 5 is configured to move the plunger 51 in the X direction by switching between a current-carrying state and a current-deenergized state of the coil, thereby moving the valve body 4 connected to the plunger 51.

[0039] The coupling member 64 connected to the mounting hole 33A on one side is connected to one space A11 of the four-way switching valve 10, the coupling member 63 connected to the central mounting hole 33B is connected to the low pressure side conduit 14 of the four-way switching valve 10, the coupling member 62 connected to the mounting hole 33C on the other side is connected to the other space A12 of the four-way switching valve 10, and the coupling member 61 connected to the protruding connection portion 212 is connected to the high pressure side conduit 13 of the four-way switching valve 10.

[0040] 2, when the valve element 4 is located on the other side in the X direction and the valve port 32B and the valve port 32C are in communication with each other, the valve port 32B and the valve port 32C are closed to the valve chest 2R by the valve element 4, and the valve port 32A is opened to the valve chest 2R. At this time, the high-pressure fluid that has flowed into the valve chest 2R from the port 212A passes through the valve port 32A and flows toward the space A11 of the four-way switching valve 10. The valve port 32B is connected to the low-pressure side conduit 14, and the space A12 connected to the valve port 32C is at low pressure. Therefore, the space A11 is at a higher pressure than the space A12, and this pressure difference causes the piston 19 and the slide valve 12 of the four-way switching valve 10 to move toward the space A11.

[0041] When the valve element 4 is positioned on one side in the X direction and the valve port 32B and the valve port 32A are in communication with each other, the valve port 32B and the valve port 32A are closed to the valve chest 2R by the valve element 4, and the valve port 32C is opened to the valve chest 2R. At this time, the high-pressure fluid that flows into the valve chest 2R from the port 212A passes through the valve port 32C and flows toward the space A12 of the four-way switching valve 10. The valve port 32B is connected to the low-pressure side conduit 14, and the space A11 connected to the valve port 32A is at low pressure. Therefore, the space A12 is at a higher pressure than the space A11, and this pressure difference causes the slide valve 12 and the piston 19 of the four-way switching valve 10 to move toward the space A12.

[0042] Here, the main parts of the slide type switching valve 1 will be described. When the coil of the electromagnetic drive unit 5 is de-energized and the plunger 51 moves to the other side in the X direction as described above, the end face 515 comes into contact with the blocking unit 22, restricting the movement to the other side. At this time, the end face 515 and the faces of the blocking unit 22 facing one side in the X direction are formed flat, and they come into planar contact. With the plunger 51 in this state of contact with the blocking unit 22, the valve body 4 communicates with the valve port 32B and the valve port 32C.

[0043] When the coil of the electromagnetic drive unit 5 is energized and the plunger 51 moves to one side in the X direction, the movement may be restricted by the end face on one side of the plunger 51 coming into contact with the attractor 52. At this time, the valve body 4 communicates between the valve port 32B and the valve port 32A.

[0044] As shown in FIG. 4, the valve seat portion 3 is attached to the valve body 2 by inserting the main body portion 36 into the attachment opening 211 as described above. The valve seat portion 3 is disposed in the attachment opening 211 so that the end portion 34 on the other side in the X direction of the outer circumferential surface of the main body portion 36 of the valve seat portion 3 contacts the inner circumferential surface 211A of the attachment opening 211. At this time, due to the dimensional difference between the inner diameter of the attachment opening 211 and the outer diameter of the main body portion 36, a gap portion 7 is formed between the end portion 35 on the other side in the X direction of the outer circumferential surface of the main body portion 36 of the valve seat portion 3 and the inner circumferential surface 211A. The valve seat portion 3 is fixed to the valve body 2 by brazing, for example, and a brazing material 8 as a fixing material is provided in the gap portion 7. In contrast, no brazing material 8 or almost no brazing material 8 is provided between the end portion 34 and the inner circumferential surface 211A.

[0045] The protruding connection part 212 is a burring-shaped part protruding from the valve body 2 toward the outside, and at its tip part, a reduced diameter part 212B is formed, the diameter of which is reduced toward the inner periphery side. The joint member 61 is a capillary, and has a tubular part 611 having a substantially constant inner diameter and outer diameter, and an expanded diameter tip part 612 whose inner diameter and outer diameter are gradually expanded from the tubular part 611 toward the tip side, and the protruding connection part 212 is disposed inside the expanded diameter tip part 612. A strainer 9 for removing foreign matter is disposed inside the expanded diameter tip part 612 and outside the protruding connection part 212. At this time, the outer diameter of the strainer 9 is smaller than the opening of the reduced diameter part 212B, and the strainer 9 is restricted from entering the valve chamber 2R. In addition, the outer diameter of the strainer 9 is larger than the inner diameter of the tubular part 611, so that it does not enter the tubular part 611. The protruding connection portion 212 and the joint member 61 are fixed together by brazing, for example.

[0046] According to the present embodiment, the plunger 51 abuts against the blocking portion 22 and the movement is restricted, so that the plunger 51 does not collide with the valve seat portion 3, and damage to the valve seat portion 3 and its surroundings can be suppressed. In addition, the blocking portion 22 is a necessary part for forming the valve chamber 2R, and there is no need to provide an additional stopper. For example, if the plunger 51 is extended to the other side to abut against the blocking portion 22, or if the blocking portion 22 is made thick to abut against the plunger 51, the error in the relative position between the valve ports 32A to 32C and the valve body 4 can be reduced compared to the case where a stopper is additionally provided. This makes it easier for the valve body 4 to normally open and close the valve ports 32A to 32C, and suppresses malfunctions.

[0047] Furthermore, the valve seat 3 has a main body 36 and a flange 37, and the flange 37 restricts insertion, thereby making it possible to suppress error in the relative position between the valve body 2 and the valve seat 3 in the Z direction, which is the insertion direction. That is, it is possible to suppress error in the position of the valve seat surface 31 in the valve chamber 2R in the insertion direction, making it easier for the valve element 4 to slide normally relative to the valve seat surface 31.

[0048] In addition, by forming the valve chamber forming portion and the plunger accommodating portion with the cylindrical portion 21 of the valve body 2, it is possible to suppress an error in the relative position that may occur when these are formed by separate members. That is, it is possible to suppress an error in the relative position between the plunger 51 and the attractor 52, and to facilitate the plunger 51 to be normally driven by magnetic force. As described above, it is possible to suppress the malfunction of the slide type switching valve 1 by suppressing damage to the valve seat portion 3 and its surroundings while suppressing an increase in the number of parts and additional configurations. In addition, by suppressing an error in the relative position between the plunger 51 and the attractor 52, it is possible to ensure the attracting force, and since it is not necessary to increase the magnetic force to accommodate the error, it is possible to suppress an increase in the size of the slide type switching valve 1.

[0049] In addition, the end 34 on the other side of the valve seat portion 3 contacts the inner circumferential surface 211A of the mounting opening 211, a gap 7 is formed between the end 35 on one side and the inner circumferential surface 211A, and the brazing material 8 is provided in the gap 7, so that the valve seat portion 3 can be fixed based on the end on the other side of the inner circumferential surface 211A of the mounting opening 211 in the X direction as a reference, and an error in the relative position between the valve body 2 and the valve seat portion 3 in the X direction can be suppressed. As described above, the plunger 51 abuts against a part of the valve body 2, and an error in the relative position between the valve body 2 and the plunger 51 in the X direction can be suppressed. Therefore, an error in the relative position between the plunger 51 and the valve seat portion 3 in the X direction can be suppressed, and an error in the relative position between the valve body 4 and the valve ports 32A to 32C can be suppressed, and a malfunction of the slide type switching valve 1 can be suppressed.

[0050] In addition, the flat end face 515 on the other side of the plunger 51 makes planar contact with the occlusion portion 22, thereby increasing the contact area and dispersing the load during a collision, thereby suppressing deformation and damage due to the collision and preventing malfunction of the slide type switching valve 1.

[0051] In addition, since the plunger 51 has the concave holding portion 514 and the valve body 4 is disposed and held within the holding portion 514, the valve body 4 can be directly held by the plunger 51, and no dedicated parts are required for holding. This makes it possible to suppress dimensional errors and relative position errors that may occur due to dedicated parts, and to suppress malfunctions of the slide type switching valve 1.

[0052] Furthermore, the cylindrical portion 21 of the valve body 2 has a protruding connection portion 212 that protrudes toward the outside of the valve chamber 2R, and the protruding connection portion 212 is inserted into the inside of the coupling member 61, thereby ensuring the contact area between the valve body 2 and the coupling member 61 and improving the fixing strength. In this case, there is no need to use a separate part to ensure the contact area, and an increase in the number of parts can be suppressed.

[0053] Furthermore, by using the slide type switching valve 1 to switch the flow path of the four-way switching valve 10 in the refrigeration cycle 100, malfunctions of the slide type switching valve 1 can be suppressed as described above, making it easier to operate the refrigeration cycle 100 normally.

[0054] The present invention is not limited to the above embodiment, and includes other configurations that can achieve the object of the present invention, and the following modifications are also included in the present invention. For example, in the above embodiment, the end 34 on the other side of the valve seat portion 3 contacts the inner circumferential surface 211A of the mounting opening 211, and the gap 7 is formed between the end 35 on one side and the inner circumferential surface 211A. However, the end 35 on one side may contact the inner circumferential surface 211A, and a gap may be formed between the end 34 on the other side and the inner circumferential surface 211A. In addition, if the dimensional difference between the outer diameter of the valve seat portion and the inner diameter of the mounting opening is sufficiently small, the above-mentioned gap may not be formed. In addition, both the end on one side and the end on the other side of the valve seat portion may not contact the inner circumferential surface of the mounting opening, and a gap may be formed on both ends. According to such a configuration, it is easy to form a continuous joint over the entire circumference, and it is easy to improve the joint strength. In addition, the valve seat portion may be integrally formed with the valve body.

[0055] In the above embodiment, the large diameter portion is formed as the flange portion 37 having a cylindrical outer circumferential surface, but the outer diameter of the large diameter portion may be partially larger than the inner diameter of the mounting opening, for example, the large diameter portion may be formed by a protrusion. The valve seat portion may be positioned in the insertion direction by other methods, for example, a mark such as a line may be provided on the outer circumferential surface of the valve seat portion, and the mark may be used for positioning.

[0056] In the above embodiment, the end face 515 of the plunger 51 is in planar contact with the occluding portion 22, but the present invention is not limited to this form of contact. For example, the other end face of the plunger or the face of one side of the occluding portion may be formed with some unevenness, a protrusion extending from the plunger toward the other side may contact the occluding portion, or a protrusion extending from the occluding portion toward one side may contact the plunger. When a protrusion is provided in this manner, it is only necessary to manage the dimensions of the protrusion, and it is easier to reduce errors in the relative positions of the valve port and the valve body compared to the case where a stopper is additionally disposed.

[0057] In addition, in the above embodiment, the valve body 4 is placed and held within the holding portion 514 of the plunger 51, but depending on the shapes and dimensions of the valve body and the plunger, the valve body may be connected to the plunger via other parts.

[0058] In addition, in the above embodiment, the tubular portion 21 of the valve body 2 has the protruding connection portion 212, which is connected to the coupling member 61, but the tube portion may be directly connected to the curved side surface of the valve body, or the tube portion may be connected to the valve body via a connecting part.

[0059] In the above embodiment, three valve ports 32A-32C are formed in the valve seat surface 31, two of which are connected by the valve disc 4 (closed from the valve chest 2R) and the remaining one is open to the valve chest 2R, but the number of valve ports is not limited to three, and the manner in which the valve ports are opened and closed by the valve disc is not limited to this either. In other words, the valve disc does not need to have the function of connecting multiple valve ports, and may simply have the function of opening and closing the valve ports.

[0060] In addition, in the above embodiment, the slide type switching valve 1 is used to switch the flow path of the four-way switching valve 10 in the refrigeration cycle 100, but the use of the slide type switching valve is not limited to this and it may be incorporated into an appropriate device or cycle for use.

[0061] Although the embodiments of the present invention have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments, and the present invention also includes design changes and the like that do not deviate from the gist of the present invention. [Explanation of symbols]

[0062] 1...slide type switching valve, 2...valve body, 21...tubular portion (valve chamber forming portion, plunger accommodating portion), 211...mounting opening, 211A...inner peripheral surface, 212...protruding connection portion, 22...obstructed portion (valve chamber forming portion), 2R...valve chamber, 3...valve seat portion, 31...valve seat surface, 32A to 32C...valve port, 34...other side end portion, 35...one side end portion, 36...main body portion (small diameter portion), 37...flange portion (large diameter portion), 4...valve body, 5...electromagnetic drive portion, 51...plunger Lunger, 514...holding portion, 515...end surface, 52...suction element, 53...coil spring (biasing means), 61...joint member (pipe portion), 7...gap portion, 8...brazing material (fixing material), 10...four-way switching valve, 12...slide valve, 19...piston, A11, A12...space, 100...refrigeration cycle, 102...compressor, 103...outdoor heat exchanger (first heat exchanger), 104...indoor heat exchanger (second heat exchanger), 105...expansion valve (expansion means)

Claims

1. A slide-type switching valve comprising: a valve body forming a valve chamber; a valve seat portion having a valve seat surface on which at least one valve port is formed and provided in the valve chamber; a valve disc that slides against the valve seat surface to open and close the valve port relative to the valve chamber; and an electromagnetic drive portion that moves the valve disc in a sliding direction along the valve seat surface, the electromagnetic drive unit includes a plunger extending along the sliding direction and connected to the valve body, an attractor disposed on one side of the plunger in the sliding direction, a coil for exciting the attractor, and a biasing means for biasing the plunger to the other side in the sliding direction, and is configured to move the plunger to the one side when energized; the valve body integrally includes a valve chamber forming portion that forms the valve chamber, and a plunger accommodating portion that accommodates the plunger and guides it in the sliding direction and in which the suction element is provided, The plunger is formed of a magnetic material into a columnar shape extending along the axial direction of the valve body as a whole, and integrally includes a columnar portion and a protruding portion protruding from the columnar portion to the other side, The cylindrical portion is accommodated in the plunger accommodating portion, The protruding portion has a flat end surface on the other side, a valve chamber forming portion that forms a valve opening and a valve status indicator, and a valve opening and a valve status indicator that are connected to the valve chamber forming portion and the valve status indicator, and a valve opening and a valve status indicator that are connected to the valve chamber forming portion and the valve status indicator,

2. A slide-type switching valve comprising: a valve body forming a valve chamber; a valve seat portion having a valve seat surface on which at least one valve port is formed and provided in the valve chamber; a valve disc that slides against the valve seat surface to open and close the valve port relative to the valve chamber; and an electromagnetic drive portion that moves the valve disc in a sliding direction along the valve seat surface, The electromagnetic drive unit includes a plunger extending along the sliding direction and connected to the valve body, an attractor disposed on one side of the plunger in the sliding direction, a coil for exciting the attractor, and a biasing means for biasing the plunger to the other side in the sliding direction, and is configured to move the plunger to the one side when energized. It is structured as follows: the valve body integrally includes a valve chamber forming portion that forms the valve chamber, and a plunger accommodating portion that accommodates the plunger and guides it in the sliding direction and in which the suction element is provided, When the electromagnetic drive unit is de-energized, the plunger comes into contact with a closing portion that closes the valve chamber from the other side in the valve chamber forming portion, thereby restricting movement of the plunger to the other side, 4. A slide type switching valve, wherein the valve chamber forming portion, the plunger accommodating portion and the closing portion are formed as a single component.

3. The valve chamber forming portion has a mounting opening formed on a side surface of a cylindrical portion, 3. The slide type switching valve according to claim 1, wherein the valve seat portion is formed separately from the valve body, and has a small diameter portion having an outer diameter smaller than an inner diameter of the mounting opening, and a large diameter portion having an outer diameter larger than the inner diameter of the mounting opening and provided on the opposite side of the valve seat surface from the small diameter portion, and the small diameter portion is inserted into the mounting opening and the insertion is restricted by the large diameter portion.

4. The valve chamber forming portion has a mounting opening formed on a side surface of a cylindrical portion, the valve seat portion is formed separately from the valve body and is attached to the valve body by being inserted through the attachment opening, 3. The slide type switching valve according to claim 1, wherein one of the other end and the one end of the valve seat portion contacts an inner circumferential surface of the mounting opening, and the other end forms a gap between the inner circumferential surface and the other end, and a fixing material is provided in the gap.

5. 3. The slide type switching valve according to claim 1, wherein the plunger has a flat end face on the other side, the flat end face being in planar contact with the blocking portion.

6. The plunger has a concave holding portion that opens to the valve seat surface side, 3. The slide type switching valve according to claim 1, wherein the valve body is disposed and held within the holding portion.

7. a pipe portion connected to the valve chamber forming portion, 3. The slide type switching valve according to claim 1, wherein the valve chamber forming portion has a cylindrical protruding connection portion at a position opposite to the valve port, the protruding connection portion protruding toward an outside of the valve chamber and being inserted into an inside of the pipe portion.

8. At least three of the valve ports are formed in the valve seat surface; Two of the at least three valve ports communicate with respective spaces sandwiching a piston that moves a slide valve in a four-way switching valve provided in a refrigeration cycle system; 3. The slide type switching valve according to claim 1, wherein the electromagnetic drive unit moves the plunger, thereby introducing high-pressure fluid into one of the spaces sandwiching the piston, thereby moving the slide valve by a pressure difference.

9. 9. A refrigeration cycle system comprising: a compressor that compresses a refrigerant which is a fluid; a first heat exchanger that functions as a condenser in a cooling mode; a second heat exchanger that functions as an evaporator in the cooling mode; expansion means that expands and reduces the pressure of the refrigerant between the first heat exchanger and the second heat exchanger; the slide type switching valve according to claim 8; and the four-way switching valve.

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