Valve device, check valve, and refrigeration cycle system

Abstract

The invention provides a valve device, a check valve and a refrigeration cycle system, which can restrain collision sound when chatter vibration is generated in a micro pressure difference environment between primary and secondary when the valve device is used in a vertical posture. A check valve (1) (valve device) is characterized in that a valve holder (122) of a valve main body (12) and the valve holder (122) of a valve body (13) are provided with a discharge hole (122c) (discharge flow path) which, when the valve body (13) is shifted to an open valve state, discharges the discharge hole (122c) before the lower end surface of the valve body (13) reaches an opening position (P11) of a communication hole (122b) penetrating a peripheral wall (122a) of the valve holder (122). The fluid is discharged from the valve port (121c) of the valve seat section (121) to the inside of the outer pipe section (11) at a flow rate less than that when the communication hole (122b) is fully open.

Description

Technical Field

[0001] The invention relates to a valve device, a check valve and a refrigeration cycle system. Background Art

[0002] In the past, a valve device was known, which includes: a cylindrical outer tube portion; a valve body, which is built into the outer tube portion and has a valve seat portion provided with a valve port; and a valve core, which is provided in the valve body in a manner that can be seated on the valve seat portion and closes the valve port when seated (for example, refer to Patent Document 1). In the valve device described in Patent Document 1, the valve core is unseated by the flow of fluid from one side (primary side) of the outer tube portion to the other side (secondary side) of the outer tube portion, and becomes an open valve state, and is seated by backflow from the secondary side, etc., and returns to a closed valve state. In addition, the valve body has a cylindrical valve bracket that supports the valve core movably inside, and a connecting hole that connects the interior of the outer tube portion and the valve port is provided on the peripheral wall of the valve bracket. The connecting hole is opened by the valve core in the open valve state moving toward the secondary side. When the connecting hole is open, the fluid flows from the primary side to the secondary side through the connecting hole. With such a structure, the valve device described in Patent Document 1 is sometimes used as a check valve that allows the flow of fluid from the primary side to pass and prevents the backflow from the secondary side.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2022-018217 Summary of the Invention

[0006] Problems to be solved by the invention

[0007] In this case, the valve device is sometimes positioned vertically, with the outer tube axially aligned with the direction of gravity, with the lower side serving as the primary side and the upper side serving as the secondary side. In this vertical position, the valve core is constantly subjected to a force due to its own weight, pushing it toward the primary side. In this situation, the pressure differential between the primary and secondary sides, which causes the fluid to flow from the primary side to the secondary side, can sometimes be so slight that the valve core is barely pushed upward against its own weight. Under this slight pressure differential, the movement of the valve core opens the communication hole, widening the flow path. When the already small pressure differential decreases, the valve core loses its support and falls toward the valve seat due to its own weight, producing a rattling sound. When the valve opening becomes blocked due to the falling valve core, the pressure differential increases, causing the valve core to rise again. This slight pressure differential between the primary and secondary sides causes the valve core to repeatedly rise and fall, resulting in fluttering vibrations, which can sometimes produce repeated rattling sounds. Furthermore, if the rattling sound during this fluttering is excessively loud, it can cause discomfort to nearby users, and it is desirable to suppress this rattling sound.

[0008] An object of the present invention is to provide a valve device, a check valve, and a refrigeration cycle system that can suppress the collision sound caused by flutter in an environment with a slight pressure difference between the primary and secondary sides when used in a vertical position.

[0009] Solutions to Problems

[0010] In order to solve the above-mentioned problems, the valve device comprises: an outer tube portion, which is formed in a cylindrical shape and is arranged in a longitudinal posture axially along the direction of gravity; a valve body, which is built into the above-mentioned outer tube portion; and a valve core, which is provided in the above-mentioned valve body. The above-mentioned valve device is characterized in that the above-mentioned valve body has: a cylindrical valve bracket, which supports the above-mentioned valve core movably along the above-mentioned axial direction; and a valve seat portion, which enables the above-mentioned valve core to be seated and is provided with a valve port closed by the seated above-mentioned valve core, and the above-mentioned valve core is configured to be pushed up from the above-mentioned valve seat portion to become an open valve state by the flow of fluid from the primary side, which is the lower side, of the above-mentioned gravity direction, in the above-mentioned outer tube portion, and through the above-mentioned The valve holder is provided with a connecting hole, which is a hole that passes through the peripheral wall of the valve holder and connects the interior of the outer tube portion and the valve port, and is blocked by the valve core until the valve core in the open valve state reaches the opening position where the fluid can pass through the hole. A discharge flow path is provided on at least one of the valve holder and the valve core, and when the valve core is transferred to the open valve state, before the valve core reaches the opening position, the discharge flow path discharges the fluid from the valve port to the interior of the outer tube portion at a flow rate less than the flow rate when the connecting hole is fully opened.

[0011] In this valve device, when transitioning from a closed to an open state, before the valve core reaches the opening position of the communicating hole, fluid is discharged from the valve port into the interior of the outer tube portion via a discharge path provided in at least one of the valve support and the valve core. This fluid discharge reduces the pressure differential between the primary and secondary sides before fluid can pass through the communicating hole. If the reduced pressure differential is insufficient to overcome the weight of the valve core, the valve core will drop at this stage. Furthermore, even if the reduced pressure differential is sufficient to push the valve core upward against its own weight, if the pressure differential before fluid discharge is already minimal, the valve core will drop approximately simultaneously with the valve core reaching the opening position of the communicating hole, allowing fluid to pass. In either case, the height of the valve core from the valve seat before it falls is kept low, suppressing the impact sound during its fall. Thus, the valve device described above can suppress the impact sound caused by chattering in an environment with a minimal pressure differential between the primary and secondary sides when used in a vertical position.

[0012] Furthermore, the above-mentioned bleed flow path increases the flow path area of ​​the fluid from the primary side to the secondary side under an environment where the pressure difference between the primary and secondary sides is normal, thereby also reducing the pressure loss by increasing the flow rate.

[0013] Here, it is preferable that a length A of the valve seat portion in the axial direction from a seating surface of the valve element to an opening end edge of the communication hole is set to be equal to or greater than ½ of an inner circumferential radius B of the valve holder.

[0014] According to this configuration, the drain flow path can be provided with a dimensional margin between the seating surface of the valve seat portion and the opening end edge of the communication hole.

[0015] In addition, it is preferred that the discharge flow path is a discharge hole having a hole size smaller than that of the communicating hole and passing through the peripheral wall of the valve holder on the primary side of the communicating hole to connect the interior of the outer tube portion and the valve port.

[0016] According to this structure, the fluid can be effectively discharged into the outer tube portion through the discharge hole on the primary side of the communication hole before the valve element reaches the opening position of the communication hole, thereby reducing the pressure difference between the primary and secondary sides and suppressing the collision sound.

[0017] In addition, preferably, an opening area ratio R of the opening area of ​​the discharge hole to the opening area of ​​the communication hole is 1 / 5<R<1 / 2.

[0018] According to this structure, under an environment with a normal pressure difference between the primary and secondary sides, the pressure difference is not excessively reduced until the valve element reaches the open position. However, under a micro-pressure differential environment, the fluid can be effectively discharged from the bleed hole to a degree that sufficiently suppresses the height of the valve element when it falls.

[0019] In addition, it is preferable that a plurality of the drain holes are provided so as to penetrate the peripheral wall of the valve holder at a plurality of locations.

[0020] According to this configuration, the fluid is dispersed and discharged into the plurality of discharge holes, so that the fluid can be discharged with high reliability when the valve element shifts to the valve open state.

[0021] Furthermore, it is preferable that the plurality of drain holes are arranged at equal angular intervals in the circumferential direction on the peripheral wall of the cylindrical valve holder.

[0022] According to this configuration, by discharging the fluid from the plurality of bleed holes arranged at equal angular intervals in the circumferential direction, the pressure reduction on the primary side of the valve element during the discharge of the fluid can be performed in a well-balanced manner.

[0023] In addition, it is preferable that the plurality of relief holes are arranged on the peripheral wall of the valve holder so as to be aligned in the circumferential direction at a constant height from the valve port in the axial direction.

[0024] According to this configuration, a plurality of relief holes can be compactly and collectively provided in the axial direction installation region of the peripheral wall of the valve holder.

[0025] In addition, it is preferable that the drain hole is formed in any one of a circular, quadrilateral, oblong, elliptical and triangular shape when viewed from the side of the peripheral wall of the valve holder.

[0026] According to this structure, the circular, quadrilateral, oblong, elliptical and triangular bleed holes allow fluid to pass smoothly, thereby effectively reducing the pressure difference between the primary and secondary sides.

[0027] In addition, it is preferred that the above-mentioned discharge flow path is a discharge groove, which is formed in at least one of the inner peripheral surface of the above-mentioned valve bracket and the outer peripheral surface of the above-mentioned valve core into a groove shape so that the above-mentioned fluid from the above-mentioned valve port can pass over the above-mentioned valve core and pass to the above-mentioned secondary side in the above-mentioned valve open state.

[0028] According to this structure, when the valve core shifts to the open state, the fluid from the valve port is guided to the secondary side using the discharge groove formed on at least one of the inner peripheral surface of the valve holder and the outer peripheral surface of the valve core, thereby being effectively discharged into the interior of the outer tube portion.

[0029] Furthermore, in order to solve the above-mentioned problems, a check valve is characterized by being constituted by the above-mentioned valve device.

[0030] Furthermore, in order to solve the above-mentioned problem, a refrigeration cycle system is characterized by including the above-mentioned check valve.

[0031] According to these check valves and refrigeration cycle systems, since both have the structure of the valve device described above, it is possible to suppress the collision sound caused by the generation of flutter in an environment with a slight pressure difference between the primary and secondary sides when used in a vertical position.

[0032] Effects of the Invention

[0033] According to the valve device, the check valve, and the refrigeration cycle system described above, it is possible to suppress the collision sound caused by the occurrence of chattering in an environment with a slight pressure difference between the primary and secondary sides when the refrigeration cycle system is used in a vertical position. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a cross-sectional view showing a cross section along the axial direction of a check valve constituted by a valve device according to one embodiment.

[0035] Figure 2 It's about Figure 1 The valve body shown in the figure is a cross-sectional view along the axial direction and a cross-sectional view along a cross section perpendicular to the axial direction along the line V11 - V11 in the figure, arranged in parallel.

[0036] Figure 3 It will be Figure 1 A perspective view showing an enlarged representation of a cross section of the valve core is shown in FIG.

[0037] Figure 4 It's about Figure 3 The valve element shown is shown in a cross-sectional view along the axial direction, a plan view viewed from above in the axial direction, and a side view viewed from a side perpendicular to the axial direction, all arranged in parallel.

[0038] Figure 5 Yes means to have Figures 1 to 4 Schematic diagram of the refrigeration cycle system with a check valve is shown.

[0039] Figure 6 Is relative to Figures 1 to 5 FIG. 1 shows first to third modified examples of the check valve.

[0040] Figure 7 Is relative to Figures 1 to 5 FIG. 4 shows a fourth and a fifth modification of the check valve.

[0041] Figure 8 Is relative to Figures 1 to 5 The figures show the sixth and seventh modified examples of the check valve.

[0042] Figure 9 Is relative to Figures 1 to 5 FIG. 2 shows a diagram of an eighth and ninth modified example of the check valve.

[0043] In the picture:

[0044] 1—Check valve (valve device), 11—External tube, 12, 25, 26, 27, 35, 36, 55, 56—Valve body, 13, 45, 46—Valve core, 100—Refrigeration cycle system, 101—Indoor heat exchanger, 102—Outdoor heat exchanger, 103—Expansion valve, 104—Four-way valve, 105—Compressor, 111—Main tube, 112—Primary tube, 113—Secondary tube, 121—Valve seat, 121a—Annular recess, 121b—Seating surface, 121c—Valve port, 121d—Inner tube, 121e—Primary opening, 122—Valve bracket, 122a—Surrounding wall, 122b —Communication hole, 122b-1—Opening end edge, 122c, 252c, 262c, 272c, 352c, 362c—Drain hole (drain flow path), 122d—End opening, 123—Valve limiter, 131—Valve core body, 132—Groove, 133—Weight reduction portion, 134—Bottom plate portion, 135—Abutment surface, 451, 461, 551, 561—Drain groove (drain flow path), 462—Feather-shaped rib, A—Length, B—Inner radius, C—Valve port radius, D11—Axial direction, D12—Gravity direction, D13—Circumferential direction, D101—Solid arrow, D102—Dash arrow, X1—Center axis. DETAILED DESCRIPTION

[0045] Hereinafter, a valve device, a check valve, and a refrigeration cycle system according to an embodiment of the present invention will be described.

[0046] Figure 1 This is a cross-sectional view showing a cross section along the axial direction of a check valve constituted by a valve device according to one embodiment. Figure 2 It's about Figure 1 The valve body shown in the figure is arranged to show a cross-sectional view along the axial direction and a cross-sectional view along a cross-section perpendicular to the V11-V11 line in the figure relative to the axial direction. Figure 3 It will be Figure 1 A perspective view showing an enlarged representation of a cross section of the valve core is shown in FIG. Figure 4 It's about Figure 3 The valve core shown is a cross-sectional view along its axial direction, a top view viewed from above in the axial direction, and a side view viewed from the side perpendicular to the axial direction. Figure 5 Yes means to have Figures 1 to 4 Schematic diagram of the refrigeration cycle system with a check valve shown in FIG. In addition, the concept of "up and down" in the following description is the same as Figure 1 In addition, the "valve open state" described in the specification is a state from when the valve core is slightly opened to when the valve core and the valve stopper described later abut against each other during full opening.

[0047] The check valve 1 of this embodiment is a valve device installed in the middle of the refrigerant (fluid) flow path in the refrigeration cycle system 100, and includes an outer tube portion 11, a valve body 12, and a valve element 13. The check valve 1 is used by arranging the outer tube portion 11, which is formed into a cylindrical shape, in a vertical position along the axial direction D11 of the central axis X1 and along the direction of gravity D12.

[0048] The outer tube portion 11 is a cylindrical component extending in the axial direction D11. It is formed by deep drawing using a metal material such as copper and is positioned vertically with the axial direction D11 aligned with the direction of gravity D12, as described above. The outer tube portion 111 includes a cylindrical main tube portion 111 extending in the axial direction D11; a primary tube 112 extending toward the primary side of the main tube portion 111, which is continuous with the primary end portion (below the primary end in the direction of gravity); and a secondary tube 113 extending toward the secondary side of the main tube portion 111, which is continuous with the secondary end portion (below the secondary end portion in the direction of gravity). In this embodiment, the main tube portion 111, primary tube 112, and secondary tube 113 are integrally formed by deep drawing, etc. However, they may be formed separately and then assembled. Specifically, for example, the primary tube 112 may be inserted into the primary end portion of the main tube portion 111, and the secondary tube 113 may be inserted into the secondary end portion of the main tube portion 111, and these may be connected by brazing, etc. In this case, the main body pipe portion 111 may be divided into two parts in the axial direction D11 and fixed by screwing or welding.

[0049] Radially inwardly protruding fixing portions 111a are formed at four locations on the primary side of the main tube portion 111. These fixing portions 111a secure the valve seat portion 121 (described later) of the valve body 12 and are deformed by riveting using the punch of a stamping machine. The valve body 12 is housed within the main tube portion 111. The valve body 12 comprises a cylindrical valve seat portion 121, which is press-fitted into the primary inner circumference of the main tube portion 111, and a cylindrical valve holder 122, which is continuous with the secondary end of the valve seat portion 121 and extends toward the secondary side. The valve seat portion 121 is formed using a metal material such as brass through machining. A radially inwardly recessed annular recess 121a is formed on the primary side of the outer circumference of the valve seat portion 121. The fixing portions 111a of the main tube portion 111 engage these recesses and secure the valve body 121. This secures the valve seat portion 121 to a predetermined position within the main tube portion 111.

[0050] The end edge around the opening on the secondary side of the valve seat portion 121 constitutes a seating surface 121b on which the valve core 13 can be seated and abuts against the flat abutting surface 135 of the valve core 13. In addition, a valve port 121c is formed in the center of the valve seat portion 121 in such a manner as to be open to the seating surface 121b and extends through the valve seat portion 121 in the axial direction D11. The valve port 121c is closed by the valve core 13 seated on the valve seat portion 121 and is opened by the valve core 13 leaving its seat. An inner tube portion 121d constituting the inner circumferential surface of the valve seat portion 121 is continuously formed on the primary side of the valve port 121c. A primary opening portion 121e is formed at the end of the primary side of the inner tube portion 121d, which opens on the primary side and is connected to the primary pipe 112. The inner diameter of the primary opening portion 121e is set to be approximately the same size as the inner diameter of the valve port 121c.

[0051] The valve support 122 is a cylindrical portion that accommodates the valve core 13 in the outer tube portion 11 and supports the valve core 13 so that it can move freely in the axial direction D11. Figure 1 As shown, the peripheral wall 122a is formed by rising from the end edge of the secondary side of the valve seat portion 121. The annular flat surface between the inner periphery of the end portion of the peripheral wall 122a on the valve seat portion 121 side and the inner edge of the opening is the seating surface 121b. The outer diameter of the valve bracket 122 is set to be smaller than the inner diameter of the outer tube portion 11, and the fluid flows along the axial direction D11 through the space generated between the valve bracket 122 and the outer tube portion 11. On the other hand, the inner diameter of the valve bracket 122 is set to be larger than the inner diameter of the valve port 121c. Specifically, as Figure 2 As shown, the inner radius B, which is the radius of the inner diameter of the valve holder 122 , is set to be larger than the valve port radius C, which is the radius of the inner diameter of the valve port 121 c .

[0052] Connecting holes 122b that radially penetrate the cylindrical peripheral wall 122a are formed at four locations of the valve holder 122. As a result, the interior of the valve holder 122 and the interior of the outer tube portion 11 are connected. That is, the connecting hole 122b penetrates the peripheral wall 122a and connects the interior of the outer tube portion 11 and the valve port 121c. The connecting hole 122b is formed in a circular shape when viewed from the side in the direction of the through hole of the peripheral wall 122a of the valve holder 122, and a plurality of connecting holes 122b are provided at equal intervals on the circumferential direction D13 of the valve holder 122. Specifically, the four connecting holes 122b are arranged at equal angular intervals (90° intervals) on the circumferential direction D13. Here, as Figure 2 As shown, the length A in the axial direction D11 between the seating surface 121b and the primary-side opening edge 122b-1 of the communicating hole 122b is set to be at least half the length of the inner radius B of the valve holder 122. Furthermore, a drain hole 122c serving as a drain passage, described later, is formed in the peripheral wall 122a of the valve holder 122. This drain hole 122c will be described later.

[0053] Furthermore, a roughly annular valve stopper 123, made of a metal material such as stainless steel, is attached to the inner surface of the secondary-side end opening 122d of the peripheral wall 122a of the valve holder 122. The valve stopper 123 is a C-shaped retaining ring that restricts the movement of the abutting valve core 13 toward the secondary side, defining the extreme end position of the valve core 13's movement toward the secondary side. Here, the flow path and flow pattern of the check valve 1 when it is open are described. When fluid is pushed upward from the primary tube 112 toward the outer tube 11, the valve core 13 lifts from its seat due to the fluid pressure differential. When rising, the fluid rising from the valve port 121c flows from the lower end surface of the valve core 13 (abutment surface 135) to the circumferential upper part of the valve core 13, and branches to the four parts of the four connecting holes 122b of the valve bracket 122, flows through the connecting holes 122b, and then passes through the space between the outer periphery of the valve bracket 122 and the inner periphery of the outer tube portion 11, and the fluid flows to the downstream side of the axial direction D11, that is, the secondary side of the outer tube portion 11, into the secondary tube 113.

[0054] The valve core 13 is a resin component that is freely slidably disposed in the valve holder 122 of the valve body 12 along the axial direction D11. The valve core 13 has four grooves 132 extending along the axial direction D11 in the roughly cylindrical valve core body 131, and the cross-sectional shape of the cross section intersecting the axial direction D11 is roughly cross-shaped. By forming the grooves 132, the sliding resistance of the valve core 13 relative to the axial direction D11 of the valve holder 122 is reduced, and the valve core 13 can slide smoothly. A weight reduction portion 133 is formed in the center of the valve core body 131 of the valve core 13, which reduces the weight in a non-through manner from the center of the end face on the secondary side toward the primary side. The weight reduction portion 133 suppresses the generation of dents, bubbles, etc. when the valve core 13 is resin-molded, and contributes to the lightweighting of the valve core 13. The primary-side end portion of the valve body 131 forms a disc-shaped bottom plate portion 134 . The lower end surface of the bottom plate portion 134 serves as a flat contact surface 135 that contacts the flat seating surface 121 b of the valve seat portion 121 .

[0055] The check valve 1 thus constructed is for example Figure 1The vertical position shown operates as follows. First, when the valve core 13 is seated on the valve seat 121 and in a closed state with the abutment surface 135 and the seating surface 121b in contact, fluid flows from the primary tube 112 toward the secondary tube 113 in the downstream direction. The flow of fluid flowing out of the valve port 121c then pushes the valve core 13 upward from the valve seat 121, causing it to enter an open state. In this open state, the valve core 13 moves to its maximum position, where it abuts against the valve stopper 123. There, it abuts against the valve stopper 123, restricting its movement toward the secondary side. Then, when the downstream flow of the fluid stops, the valve core 13 falls due to its own weight, seating itself again on the valve seat 121 and returning to the closed state. Furthermore, after the downstream flow stops, or if there is a counterflow from the secondary side while the flow stops, the downward pressure from the counterflow from the secondary side and the downward movement due to its own weight combine to return the valve to the closed state.

[0056] Here, in this embodiment, as described above, the drain hole 122c serving as a drain flow path for the fluid is formed in the peripheral wall 122a of the valve holder 122. Figure 2 , a cross-sectional view along line V11-V11 passing through the bleed hole 122c is shown.

[0057] First, the so-called bleed flow path here refers to a flow path that, when the valve element 13 transitions to the aforementioned open state, before the lower end surface of the valve element 13 reaches the opening position P11 (described later), releases fluid from the valve port 121c into the interior of the outer tube portion 11 at a flow rate less than the flow rate when the communication hole 122b is fully open. Opening position P11 is the position where the valve element 13 moves toward the secondary side and the abutment surface 135 of the valve element 13 exceeds the primary opening edge 122b-1 of the communication hole 122b, allowing fluid to pass through the communication hole 122b. Specifically, in this embodiment, when the valve element 13 separates from the valve seat 121 and transitions to the open state, fluid flowing out of the valve port 121c is released into the interior of the outer tube portion 11 at the aforementioned small flow rate through the bleed flow path before passing through the communication hole 122b. Furthermore, in this embodiment, the bleed passage is formed by bleed hole 122c, which is smaller in size than communicating hole 122b and penetrates peripheral wall 122a of valve holder 122 on the primary side relative to communicating hole 122b, connecting the interior of outer tube 11 with valve port 121c. Specifically, the bleed hole 122c is sized so that the opening area ratio R of bleed hole 122c to the opening area of ​​communicating hole 122b satisfies 1 / 5 < R < 1 / 2.

[0058] The bleed holes 122c are formed to have the same circular shape as the communication holes 122b when viewed from the side of the peripheral wall 122a of the valve holder 122. Multiple bleed holes 122c are provided to penetrate the peripheral wall 122a at various locations. Specifically, the four bleed holes 122c are arranged at even angular intervals (90° intervals) in the circumferential direction D13, corresponding one-to-one with the four communication holes 122b on the primary side. Furthermore, these four bleed holes 122c are arranged on the peripheral wall 122a of the valve holder 122, aligned along the circumferential direction D13 at a constant height from the valve port 121c in the axial direction D11.

[0059] like Figure 5 As shown, the check valve 1 described above is used in the middle of the refrigerant flow path in the refrigeration cycle system 100. The refrigeration cycle system 100 is used in air conditioners such as commercial air conditioners. The refrigeration cycle system 100 is connected to an indoor heat exchanger 101, an outdoor heat exchanger 102, an expansion valve 103, a four-way valve 104, and three compressors 105 connected in parallel via piping. To prevent backflow of refrigerant to each compressor 105, the check valve 1 is connected between the discharge (high-pressure output) side of each compressor 105 and the four-way valve 104, with the compressor 105 as the primary pipe 112 side and the four-way valve 104 as the secondary pipe 113 side. During cooling operation, as indicated by the solid arrow D101, the refrigerant is compressed by the compressor 105 and then passes through the check valve 1 and the four-way valve 104 to reach the outdoor heat exchanger 102. Then, after releasing heat in the outdoor heat exchanger 102 , the refrigerant flows to the indoor heat exchanger 101 through the expansion valve 103 . The refrigerant that has absorbed heat in the indoor heat exchanger 101 returns to the compressor 105 via the four-way valve 104 .

[0060] During heating operation, as indicated by dashed arrow D102, after being compressed by compressor 105, the refrigerant flows through check valve 1 and four-way valve 104 to indoor heat exchanger 101. Having released heat in indoor heat exchanger 101, the refrigerant flows through expansion valve 103 to outdoor heat exchanger 102. After absorbing heat in outdoor heat exchanger 102, the refrigerant returns to compressor 105 through four-way valve 104. The refrigeration cycle system 100 repeats these cycles to cool or heat the room. For example, under conditions of high cooling load, all three compressors 105 operate simultaneously, so all three check valves 1 are fully open. Under conditions of low cooling load, only one compressor 105 operates, so the other two compressors 105 are not in operation. At this point, the pressure on the secondary pipe 113 side of the two check valves 1 is higher than the pressure on the primary pipe 112 side, causing backflow from the secondary pipe 113 side, and the two check valves 1 close.

[0061] At this time, in the check valve 1, the pressure differential between the primary and secondary sides of the fluid flowing from the primary side to the secondary side can sometimes reach a level so small that the valve core 13 can barely overcome its own weight and be pushed upward. Under such a small pressure differential, the valve core 13 is pushed upward until the pressure differential reaches a level that cannot overcome the weight of the valve core 13. It then falls toward the valve seat 121, producing a crashing sound. As the valve core 13 falls, the valve port 121c becomes blocked, increasing the pressure differential and causing the valve core to rise again. Under such a small pressure differential between the primary and secondary sides, the valve core 13 repeatedly rises and falls, causing flutter vibrations, sometimes accompanied by multiple crashing sounds. Furthermore, if the crashing sounds during such flutter vibrations are excessively loud, they can sometimes cause discomfort to nearby users. In the check valve 1 (valve device) and refrigeration cycle system 100 of the above-described embodiment, by providing a bleed hole 122c serving as a bleed flow path in the valve support 122, the crashing sounds during flutter vibrations can be suppressed through the effects described below.

[0062] Specifically, in this embodiment, when transitioning from the closed to the open state, before the lower end surface of the valve core 13 reaches the opening position P11 of the communicating hole 122b, fluid is released from the valve port 121c into the interior of the outer tube 11 via the bleed hole 122c, which serves as a release path and is provided in the valve holder 122. This fluid release reduces the pressure differential between the primary and secondary sides before fluid can pass through the communicating hole 122b. If the reduced pressure differential is insufficient to overcome the weight of the valve core 13, the valve core 13 will drop at this stage. Furthermore, even if the reduced pressure differential is sufficient to push the valve core 13 upward against its own weight, if the pressure differential before the fluid release is already minimal, the valve core 13 will drop approximately simultaneously with the lower end surface of the valve core 13 reaching the opening position P11 of the communicating hole 122b, allowing fluid to pass. In any case, the height of the lower end face (contact surface 135) of the valve core 13 that is about to fall from the seat surface 121b of the valve seat portion 121 is suppressed to be lower than the height of the contact surface 135 relative to the seat surface 121b when it contacts the valve stopper 123, that is, the maximum position, and the collision sound when falling is suppressed. In this way, according to this embodiment, the collision sound caused by the flutter generated in the micro-pressure difference environment between the primary and secondary when used in a vertical position can be suppressed. In addition, in the above description, the use of Figure 5 The example of commercial air conditioner shown in the figure shows that flutter and knocking sound are generated, but Figure 5 In the check valve in the refrigeration cycle system other than the system, the same problem is also generated. In this case, of course, the problem can be solved by the above-mentioned structure to suppress the collision sound when the flutter occurs.

[0063] Furthermore, the bleed hole 122c serving as the bleed flow path increases the flow path area of ​​the fluid from the primary side to the secondary side under normal pressure differential conditions, thereby also reducing pressure loss by increasing the flow rate.

[0064] Here, in this embodiment, the length A in the axial direction D11 from the seating surface 121b of the valve element 13 to the primary-side opening edge 122b-1 of the communicating hole 122b in the valve seat portion 121 is set to be at least 1 / 2 of the inner radius B of the valve holder 122. With this configuration, the bleed hole 122c serving as a bleed flow path can be provided with a dimensional margin between the seating surface 121b of the valve seat portion 121 and the opening edge 122b-1 of the communicating hole 122b.

[0065] Furthermore, in this embodiment, the discharge flow path is provided via discharge hole 122c, which is located on the primary side of communicating hole 122b and has a smaller hole size than communicating hole 122b. This structure allows the fluid to be effectively discharged into the outer tube portion 11 before the lower end surface of the valve core 13 reaches the opening position P11 of communicating hole 122b via discharge hole 122c, which is located on the primary side of communicating hole 122b. This reduces the pressure differential between the primary and secondary sides, thereby suppressing the impact sound.

[0066] Furthermore, in this embodiment, the opening area ratio R of the bleed hole 122c relative to the opening area of ​​the communicating hole 122b is set to 1 / 5 < R < 1 / 2. This configuration prevents excessive pressure drop until the lower end of the valve element 13 reaches the opening position P11, even under conditions of a normal primary / secondary pressure differential. Furthermore, under conditions of a low pressure differential, fluid can be effectively released from the bleed hole 122c to a degree that sufficiently suppresses the height of the valve element 13 during its downward movement.

[0067] In addition, in this embodiment, a plurality of, specifically, four, drain holes 122c are provided. According to this structure, by distributing the fluid to the four drain holes 122c and draining it, the fluid can be drained with high reliability when the valve element 13 shifts to the valve open state.

[0068] Furthermore, in this embodiment, the four bleed holes 122c are arranged at equal angular intervals of 90° in the circumferential direction D13. This configuration allows for a well-balanced pressure reduction on the primary side of the valve element 13 during fluid discharge by discharging fluid from the four bleed holes 122c arranged at equal angular intervals along the circumferential direction D13.

[0069] In this embodiment, the four relief holes 122c are arranged in the circumferential direction D13 at a constant height from the valve port 121c in the axial direction D11. This configuration allows the four relief holes 122c to be compactly concentrated in the axial direction D11 of the peripheral wall 122a of the valve holder 122.

[0070] In this embodiment, the relief hole 122c is formed in a circular shape when viewed from the side of the peripheral wall 122a of the valve holder 122. This structure allows fluid to smoothly pass through the circular relief hole 122c, thereby effectively reducing the pressure difference between the primary and secondary sides.

[0071] Next, various modifications of the above-described embodiment will be described.

[0072] Figure 6 Is relative to Figures 1 to 5 FIG. 1 shows first to third modified examples of the check valve. Figure 6 (A) represents the first modification example, Figure 6 (B) represents the second modification example, Figure 6 (C) represents the third modification. Figure 6 In, only Figure 2 The components shown in the figure are equivalent to the components required for the description. Figure 2 The same reference numerals are used to indicate the same components, and repeated description of the same components will be omitted below.

[0073] exist Figure 6 In the three modified examples shown, the relief holes 252c, 262c, and 272c of the valve holder 122 of the valve body 25, 26, and 27 are different from those in the above-mentioned embodiment. Figure 6 In (A), a cross-sectional view of the valve body 25 of the first modified example along the axial direction D11 and a cross-sectional view along the V251-V251 line passing through the relief hole 252c in the figure are arranged. Figure 6 In (B), a cross-sectional view of the valve body 26 of the second modified example along the axial direction D11 and a cross-sectional view along a cross-sectional plane perpendicular to the line V261-V261 passing through the relief hole 262c in the figure are arranged. Figure 6 In (C), a cross-sectional view of the valve body 27 according to the third modification example along the axial direction D11 and a cross-sectional view of a cross section orthogonal to the line V271 - V271 passing through the bleed hole 272 c in the figure are arranged in parallel.

[0074] Figure 6 The discharge hole 252c of the first modified example shown in (A) is formed into a quadrilateral in side view. Figure 6The relief hole 262c of the second modified example shown in FIG. 1(B) is formed in an oblong shape with the axial direction D11 as the major axis in a side view. Figure 6 The discharge hole 272c of the third modified example shown in (C) is formed to be circular in side view, but has a diameter ratio of Figure 2 The bleed hole 122c of the illustrated embodiment is a small diameter hole.

[0075] In the first to third modified examples described above, it is needless to say that, similar to the above-mentioned embodiment, by providing the relief holes 252c, 262c, and 272c, the collision sound caused by the flutter generated in the environment of the slight pressure difference between the primary and secondary when used in the vertical position can be suppressed.

[0076] In addition, in the first and second modified examples in which the relief holes 252c and 262c are provided in shapes other than circular, the fluid can pass smoothly and the pressure difference between the primary and secondary sides can be effectively reduced, similarly to the circular relief holes 122c and 272c in the above-mentioned embodiment and the third modified example.

[0077] Furthermore, the relief holes other than circular are not limited to the quadrilateral relief holes 252c of the first modification and the oblong relief holes 262c of the second modification, and may also be formed in an elliptical or triangular shape in side view. In the second modification, the relief holes are oblong with the axial direction D11 as the major axis in side view, but may also be transversely oblong with the axial direction D11 as the minor axis in side view.

[0078] Figure 7 Is relative to Figures 1 to 5 FIG. 4 shows a fourth and a fifth modification of the check valve. Figure 7 (A) represents the fourth modification, Figure 7 (B) represents the fifth modification. Figure 7 In, only Figure 2 The components shown in the figure are equivalent to the components required for the description. Figure 2 The same reference numerals are used to indicate the same components, and repeated description of the same components will be omitted below.

[0079] exist Figure 7 In the two modified examples shown, the relief holes 352c and 362c of the valve supports 122 of the valve bodies 35 and 36 are different from those in the above-mentioned embodiment. Figure 7 In (A), a cross-sectional view of the valve body 35 of the fourth modified example along the axial direction D11 and a cross-sectional view along the V351-V351 line passing through the bleed hole 352c in the figure are arranged in parallel. Figure 7In (B), a cross-sectional view of the valve body 36 of the fifth modification example along the axial direction D11 and a cross-sectional view of a cross section orthogonal to the line V361 - V361 passing through the bleed hole 362 c in the figure are shown side by side.

[0080] Figure 7 The fourth modified example shown in FIG. 1 (A) differs from the above-described embodiment in the number and arrangement of the multiple drain holes 352c provided along the circumferential direction D13. In this modified example, the three drain holes 352c are arranged at equal angular intervals of 120°. Furthermore, one of the three drain holes 352c is located directly below the communicating hole 122b, while the remaining two are located at positions offset from the communicating hole 122b in the circumferential direction D13.

[0081] Figure 7 In the fifth modified example shown in FIG. 1B , the number of the drain holes 352 in the circumferential direction D13 is four, similar to the above-described embodiment, but their arrangement differs from the above-described embodiment. In this modified example, the four drain holes 362c are arranged at equal 90° intervals, and each drain hole 362c is staggered in the circumferential direction D13 at 45° intervals from the communicating hole 122b.

[0082] In the fourth and fifth modified examples described above, as in the above-described embodiment, it is needless to say that the provision of the relief holes 352c and 362c can suppress the collision sound caused by flutter in an environment with a slight pressure difference between the primary and secondary pressures when used in a vertical position.

[0083] Figure 8 Is relative to Figures 1 to 5 The figures show the sixth and seventh modified examples of the check valve. Figure 8 (A) represents the sixth modification example, Figure 8 (B) represents the seventh modification. Figure 8 In, only Figure 4 The components shown in the figure are equivalent to the components required for the description. Figure 4 The same symbols are used to indicate the same components, and the repeated description of these identical components will be omitted below. Figure 1The components shown are shown. In the case of the valve cores 45 and 46 of the sixth and seventh variations, unlike the valve body 12 of the first embodiment, the valve body is provided with relief grooves 451 and 461. Therefore, a valve body without the relief hole 122c is used. Furthermore, even the valve cores 45 and 46 can be combined with the valve bodies of the first through fifth variations having relief holes, or the valve bodies of the eighth and ninth variations having relief grooves, described later. In this case, in addition to the relief grooves of the valve core, the relief holes and grooves on the inner circumference of the valve support portion also serve as flow paths, thereby increasing the relief space, thereby reducing pressure loss and improving flow rate.

[0084] Figure 8 The two modified examples shown are different from the above-mentioned embodiment in that the discharge flow path is provided in the valve core 45, 46. Figure 8 In (A), regarding the valve core 45 of the sixth modification, a cross-sectional view along the axial direction D11, a top view viewed from above the axial direction D11, and a side view viewed from the side perpendicular to the axial direction D11 are shown in sequence. Figure 8 In (B), regarding the valve element 46 of the seventh modification, a cross-sectional view along the axial direction D11 , a top view viewed from above in the axial direction D11 , and a side view viewed from a side perpendicular to the axial direction D11 are arranged in parallel.

[0085] exist Figure 8 The sixth modification shown in (A) and Figure 8 In the seventh modification shown in FIG. 1 (B), the discharge flow paths are both discharge grooves 451 and 461 formed on the outer peripheral surfaces of the valve cores 45 and 46. Figure 8 In (A), a cross-sectional view along the line V451-V451 in the figure passing through the discharge groove 451 is shown as a cross-sectional view along the axial direction D11. Figure 8 (B) also shows a cross-sectional view along the line V461 - V461 in the figure passing through the discharge groove 461 .

[0086] right Figure 8 The valve core 45 shown in (A) is used for a valve body having no discharge holes 122c, 252c, 262c, 272c, 352c, 362c as in the first embodiment and the first to fifth modified examples, and only the communication hole 122b is open in the circumferential direction of the valve holder. Figure 8The sixth modified example shown in FIG. (A) has a relief groove 451 formed as a groove along the axial direction D11 on the outer circumferential surface of the disc-shaped bottom plate portion 134. When the valve element 45 is unseated from the seating surface 121b and transitions to the open state, fluid from the valve port 121c enters the space between the bottom plate portion 134 and the seating surface 121b through the relief groove 451 on the outer circumferential surface, passes over the bottom plate portion 134 of the valve element 45 in the axial direction D11, and is discharged from the communicating hole 122b and / or the interior of the valve holder 122 through the inner circumference of the valve stopper 123 to the secondary side. In the sixth modified example, four relief grooves 451 are arranged on the outer circumferential surface of the bottom plate portion 134 at equal 90-degree intervals in the circumferential direction D13.

[0087] If the Figure 8 The valve core 46 shown in (B) is used for a valve body having no discharge holes 122c, 252c, 262c, 272c, 352c, 362c as in the first embodiment and the first to fifth modified examples, and only the communication hole 122b is open in the circumferential direction of the valve holder. Figure 8 The relief groove 461 of the seventh modified example shown in FIG. 1B is formed as a groove-shaped portion extending along the axial direction D11 from the end surfaces of the four feather-shaped ribs 462 that define the four grooves 132 on the outer circumference of the valve core body 131 to the outer circumference of the bottom plate 134. When the valve core 46 is unseated from the seating surface 121b and transitions to the open state, fluid from the valve port 121c entering between the bottom plate 134 and the seating surface 121b enters the relief groove 461 extending from the bottom plate 134 toward the feather-shaped rib 462. The fluid then flows through the relief groove 461, passes over the valve core 46 in the axial direction D11, and is discharged to the secondary side through the communicating hole 122b and / or from within the valve holder 122, through the inner circumference of the valve stopper 123. In the seventh modified example, one relief groove 461 is formed on each of the four feather-shaped ribs 462, for a total of four relief grooves.

[0088] In the sixth and seventh modified examples described above, the provision of relief grooves 451 and 461 as fluid discharge paths also achieves the same effects as the above-described embodiment. Specifically, the sixth and seventh modified examples can also suppress the impact sound caused by fluttering in an environment with a slight pressure difference between the primary and secondary pressures when used in a vertical position.

[0089] In the sixth and seventh modifications, when the valve elements 45 and 46 are shifted to the open state, the fluid from the valve port 121 c is guided toward the secondary side by the discharge grooves 451 and 461 , thereby being effectively discharged into the outer tube 11 .

[0090] Figure 9 Is relative to Figures 1 to 5 FIG. 2 shows a diagram of an eighth and ninth modified example of the check valve. Figure 9 (A) represents the eighth modification example, Figure 9 (B) represents the ninth modification. Figure 9 In, only Figure 2 The components shown in the figure are equivalent to the components required for the description. Figure 2 The same symbols are used to indicate the same components, and the repeated description of these identical components will be omitted below. Figure 1 The components shown.

[0091] exist Figure 9 In the two modified examples shown, the valve bodies 55 and 56 are provided with a discharge flow path, but the discharge flow path is not a discharge hole, but a discharge groove 551 and 561 provided on the inner peripheral surface of the valve support 122. Figure 9 In (A), regarding the valve body 55 of the eighth modification, a cross section perpendicular to the line V551-V551 intersecting the relief groove 551 is shown. Figure 9 FIG. 5(B) shows a plan view of the valve body 56 according to the ninth modification example, showing an end portion of a discharge groove 561 extending to an end portion opening 122 d on the secondary side as will be described later.

[0092] Figure 9 The eighth modified example shown in FIG. (A) shows a relief groove 551 formed on the inner circumferential surface of the peripheral wall 122a of the valve holder 122. This relief groove 551 extends along the axial direction D11 from the seating surface 121b surrounding the valve port 121c of the valve seat portion 121 to the primary-side opening edge 122b-1 of the communicating hole 122b. When the valve element 13 is unseated from the seating surface 121b and transitions to the open state, fluid from the valve port 121c that enters between the bottom plate portion 134 and the seating surface 121b passes through the relief groove 551, passes over the valve element 13 in the axial direction D11, and is guided to the communicating hole 122b. The fluid is then discharged from the communicating hole 122b to the secondary side of the outer tube portion 11. In the eighth modified example, four relief grooves 551 are arranged directly below each of the four communicating holes 122b at equal 90° intervals in the circumferential direction D13, in a one-to-one arrangement.

[0093] Figure 9The ninth modified example shown in FIG. (B) also includes a relief groove 561 formed on the inner circumferential surface of the peripheral wall 122a of the valve holder 122. This relief groove 561 extends from the seating surface 121b surrounding the valve port 121c of the valve seat portion 121, through the spaces between the communicating holes 122b, and along the axial direction D11 to the secondary end opening 122d. When the valve element 13 is unseated from the seating surface 121b and transitions to the open state, fluid from the valve port 121c that enters between the bottom plate portion 134 and the seating surface 121b passes through the relief groove 561, passes over the valve element 13, and is guided to the secondary end opening 122d in the axial direction D11. The fluid is then discharged from this end opening 122d to the secondary side of the outer tube portion 11. In the ninth modified example, four relief grooves 561 are arranged at equal 90° intervals in the circumferential direction D13, passing through the spaces between the four communicating holes 122b.

[0094] In the eighth and ninth modified examples described above, by providing the discharge grooves 551 and 562 as fluid discharge paths, the same effects as those of the above-described embodiment can be achieved. Specifically, the eighth and ninth modified examples can also suppress the impact sound caused by fluttering in an environment with a slight pressure difference between the primary and secondary pressures when used in a vertical position.

[0095] In the eighth and ninth modified examples, the drain channel is formed as groove-shaped drain grooves 551 and 562 on the inner circumferential surface of the valve holder 122. These grooves allow fluid from the valve port 121c to pass through the valve core 13 and toward the secondary side when the valve is in the open state. With this configuration, when the valve core 13 transitions to the open state, the fluid from the valve port 121c is guided through the drain grooves 551 and 562 to pass through the valve core 13 and toward the secondary side, enabling efficient discharge into the interior of the outer tube 11.

[0096] The above-described embodiments and the first to ninth variations merely illustrate representative aspects of the present invention and are not intended to be limiting. Specifically, various variations are possible without departing from the spirit of the present invention. Such variations, as long as they still include the valve device, check valve, and refrigeration cycle system of the present invention, are naturally encompassed within the scope of the present invention.

[0097] For example, in the above-mentioned embodiment and the first to ninth modified examples, a check valve 1 used for an air conditioner such as a commercial air conditioner is illustrated as an example of a valve device. However, the valve device is not limited thereto, and may be a valve device other than a check valve. In addition, even when applied to a check valve, the check valve is not limited to commercial air conditioners, but may be applied to household air conditioners, and is not limited to air conditioners, but may be applied to various freezers, refrigerators, etc. Furthermore, even when assembled in a refrigeration cycle system as a check valve, the assembly location is not limited to Figure 5The discharge side of the compressor 105 shown can be used to prevent backflow at various locations in various refrigeration cycle systems. Furthermore, various refrigerants are used as refrigerants in various refrigeration cycle systems (e.g., various Freon-based refrigerants, hydrocarbon-based refrigerants, CO2, ammonia, and other natural refrigerants). Check valves can also be used in refrigeration cycle systems corresponding to these refrigerants.

[0098] Furthermore, in the above-described embodiment and the first to ninth modifications, as an example of a valve body, a valve body 12 is illustrated in which the length A from the seating surface 121b of the valve seat portion 121 to the primary opening edge 122b-1 of the communicating hole 122b is set to at least ½ the inner radius B of the valve holder 122. However, the valve body is not limited to this, and the length from the seating surface to the primary opening edge of the communicating hole can be set to any length. However, by setting the length A from the seating surface 121b to the primary opening edge 122b-1 of the communicating hole 122b to at least ½ the inner radius B of the valve holder 122, a bleed flow path can be provided with a dimensional margin, as described above.

[0099] In the above-described embodiment and the first to fifth modified examples, the bleed holes 122c, ..., 362c provided in the valve holder 122 are illustrated as examples of a bleed channel. Furthermore, in the sixth and seventh modified examples, bleed grooves 451 and 461 provided in the valve cores 45 and 46 are illustrated as examples of a bleed channel, and in the eighth and ninth modified examples, bleed grooves 551 and 561 provided in the valve holder 122 are illustrated as examples of a bleed channel. However, the bleed channel is not limited to these. The specific form of the bleed channel is not limited as long as it allows fluid to be discharged from the valve port to the interior of the outer tube portion at a flow rate less than that when the communicating hole is fully open before the lower end surface of the valve core reaches the opening position of the communicating hole when the valve core transitions to the open state. However, as described above, the fluid can be effectively discharged into the interior of the outer tube portion by means of the discharge holes 122c, ..., 272c of the valve holder 122, the discharge grooves 451, 461 of the valve cores 45, 46, and the discharge grooves 551, 561 of the valve holder 122. Furthermore, the discharge flow path can be formed in at least one of the valve holder and the valve core, and is not limited to one or the other. It can also be formed in both the valve holder and the valve core.

[0100] In the above-described embodiment and the first to fifth modifications, as examples of bleed holes, bleed holes 122c, ..., 362c are illustrated, with an opening area ratio R set to 1 / 5 < R < 1 / 2 relative to the opening area of ​​the communicating hole 122b. However, the bleed holes are not limited to this configuration; as long as the hole size is smaller than the communicating hole, the opening area ratio can be appropriately set, for example, 1 / 10 < R < 1 / 2 or 1 / 100 < R < 1 / 2. However, by setting the opening area ratio R to 1 / 5 < R < 1 / 2, as described above, fluid can be effectively bleeded without excessively reducing the differential pressure under normal pressure conditions, while also effectively suppressing the valve element height during a drop under low pressure conditions. Therefore, the bleed hole setting of 1 / 5 < R < 1 / 2 is the optimal configuration. However, even a setting of 1 / 10 < R < 1 / 2, while slightly inferior to the optimal configuration, can achieve the same effect. Even when 1 / 100<R<1 / 2 is set, although the effect is reduced, a certain degree of effect can be obtained.

[0101] In the above-described embodiment and the first to fifth modified examples, three or four bleed holes 122c, ..., 362c are provided as examples of bleed holes. However, the bleed hole is not limited to this, and only one bleed hole may be provided. However, the multiple bleed holes 122c, ..., 362c can disperse the flow path as described above, allowing for highly reliable fluid discharge. Furthermore, even when multiple bleed holes are provided, the specific number is not limited.

[0102] In the above-described embodiment and the first to fifth modified examples, as an example of a plurality of bleed holes, bleed holes 122c, ..., 362c are arranged at equal angular intervals in the circumferential direction D13. However, the plurality of bleed holes is not limited to this arrangement and may be arranged at different angular intervals. However, the bleed holes 122c, ..., 362c arranged at equal angular intervals enable, as described above, a well-balanced pressure reduction on the primary side of the valve element 13 during fluid discharge.

[0103] In the above-described embodiment and the first to fifth modified examples, as an example of a plurality of bleed holes, bleed holes 122c, ..., 362c are arranged in the circumferential direction D13 at a constant height from the valve port 121c. However, the bleed holes are not limited to this arrangement and may be arranged at varying heights from the valve port. However, by arranging the bleed holes 122c, ..., 362c at a constant height, as described above, the bleed holes can be compactly concentrated within the arrangement area in the axial direction D11.

[0104] In addition, in the above-described embodiment and the first to fifth modified examples, as examples of bleed holes, bleed holes 122c, ..., 362c are illustrated as being formed in any of the following shapes when viewed from the side: circular, quadrilateral, oblong, elliptical, or triangular. However, the bleed holes are not limited to these shapes; the bleed holes may also be triangular, polygonal (including trapezoidal and rhombus shapes) other than quadrilaterals, or star-shaped, and the specific shape is not limited. However, as described above, bleed holes 122c, ..., 362c formed in any of the following shapes: circular, quadrilateral, oblong, elliptical, or triangular can facilitate fluid flow and effectively reduce the pressure differential between the primary and secondary streams.

[0105] In addition, in the description of the above-mentioned embodiment and the first to fifth modified examples, it is described as "an outer tube portion arranged in a vertical position with its axial direction along the direction of gravity." However, even if the axial direction is not parallel to the direction of gravity, if the valve core can fall due to its own weight, then even if the axial direction is slightly inclined relative to the direction of gravity, it is essentially considered to be along the direction of gravity and is also included in the present application. For example, as long as the secondary tube 113 of the outer tube portion 11 is within a slope of ±15° relative to the upward vertical (inclination of 0°), the valve core can fall due to its own weight and is therefore included in the present application. In addition, even if the slope is within ±30°, the valve core can fall due to its own weight and is therefore also included in the present application.

[0106] In addition, in the description of the above-mentioned embodiment and the first to fifth modified examples, a biasing member (coil spring) that biases the valve core in the valve closing direction is not provided, but a biasing member (coil spring, etc.) that biases the valve core in the valve closing direction may be provided. In this case, unlike the present application, the valve device can be used in a manner not limited to a vertical installation position.

Claims

1. A valve device comprising: The outer tube portion is formed into a cylindrical shape and is arranged in a vertical position with its axial direction along the direction of gravity; the valve body is built into the outer tube portion; and the valve core is provided in the valve body. The valve device is characterized in that The valve body includes: a cylindrical valve support that supports the valve element so as to be movable in the axial direction; and a valve seat portion that allows the valve element to be seated and is provided with a valve port that is closed by the seated valve element. The valve core is configured to be pushed upward from the valve seat portion to the valve open state by the flow of fluid from the primary side, which is the lower side in the direction of gravity, to the secondary side, which is the upper side, in the outer tube portion when the valve is in the closed state. The valve core is configured to return to the closed state by at least one of falling due to its own weight when the flow of the fluid stops and downward pressure due to backflow from the secondary side. The valve support is provided with a communicating hole, which is a hole that penetrates the peripheral wall of the valve support and connects the interior of the outer tube portion with the valve port, and is blocked by the valve core until the valve core in the valve-open state reaches the opening position where the fluid can pass through the hole. A discharge flow path is provided in at least one of the valve support and the valve core, and when the valve core is transferred to the valve-open state, before the valve core reaches the opening position, the discharge flow path discharges the fluid from the valve port to the interior of the outer tube portion at a flow rate that is less than the flow rate when the communicating hole is fully opened.

2. The valve device according to claim 1, characterized in that A length A of the valve seat portion from a seating surface of the valve element to an opening end edge of the communication hole in the axial direction is set to be equal to or greater than ½ of an inner circumferential radius B of the valve holder.

3. The valve device according to claim 1, characterized in that The drain flow path is a drain hole having a hole size smaller than that of the communicating hole and passing through the peripheral wall of the valve holder on the primary side of the communicating hole to communicate the interior of the outer tube portion with the valve port.

4. The valve device according to claim 3, characterized in that An opening area ratio R of the opening area of ​​the discharge hole to the opening area of ​​the communication hole is 1 / 5<R<1 / 2.

5. The valve device according to claim 3, characterized in that A plurality of the drain holes are provided so as to penetrate the peripheral wall of the valve holder at a plurality of locations.

6. The valve device according to claim 5, characterized in that The plurality of relief holes are arranged at equal angular intervals in the circumferential direction on the peripheral wall of the cylindrical valve holder.

7. The valve device according to claim 5, characterized in that The plurality of relief holes are arranged on the peripheral wall of the valve holder in a circumferential direction at a constant height from the valve port in the axial direction.

8. The valve device according to claim 3, characterized in that The relief hole is formed in any one of a circular, quadrilateral, oblong, elliptical, and triangular shape when viewed from the side of the peripheral wall of the valve holder.

9. The valve device according to claim 1, characterized in that The discharge flow path is a discharge groove formed in at least one of an inner peripheral surface of the valve holder and an outer peripheral surface of the valve element in a groove shape for allowing the fluid from the valve port to pass over the valve element and toward the secondary side in the valve open state.

10. A check valve, characterized in that: The valve device is constituted by any one of claims 1 to 9.

11. A refrigeration cycle system, characterized in that: A check valve according to claim 10 is provided.

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