Valve gear, check valve, and refrigeration cycle system

Abstract

To provide a valve gear, a check valve, and a refrigeration cycle system, by which it is possible to reduce collision noise on the occurrence of chattering under a slight differential pressure environment between primary and secondary mutual during use in a longitudinally mounted attitude.SOLUTION: A check valve 1 (valve gear) includes a spill port 122c (spill flow channel) disposed in a valve holder 122 among the valve holder 122 of a valve main body 12 and a valve body 13. If the valve body 13 enters a valve open state, the spill port allows a fluid to escape from a valve port 121c of a valve seat part 121 to an interior of an outer pipe part 11 in a smaller distribution amount than a distribution amount during a fully open of a communicating hole 122b before a lower end surface of the valve body 13 reaches an open position P11 of the communication hole 122b penetrating a peripheral wall 122a of the valve holder 122.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Conventionally, a valve device has been known that includes a cylindrical outer tube portion, a valve body having a valve seat portion built into the outer tube portion and provided with a valve port, and a valve element attached to the valve body so as to be seated on the valve seat and close the valve port when seated (see, for example, Patent Document 1). In the valve device described in Patent Document 1, the valve element is unseatable and enters an open valve state when fluid flows from one side (primary side) of the outer tube portion to the other side (secondary side). It then reseats and returns to a closed valve state when backflow from the secondary side or the like occurs. The valve body also includes a cylindrical valve holder that movably supports the valve element therein. The peripheral wall of the valve holder is provided with a communication hole that connects the interior of the outer tube portion to the valve port. This communication hole opens when the valve element moves toward the secondary side in the open valve state. When the communication hole opens, fluid flows from the primary side to the secondary side through the communication hole. Utilizing this configuration, the valve device described in Patent Document 1 can be used as a check valve that allows fluid to flow from the primary side and prevents backflow from the secondary side. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-018217 Summary of the Invention [Problem to be solved by the invention]

[0004] The valve device described above may be installed vertically, with the axial direction of the outer tube aligned with gravity, with the lower side serving as the primary side and the upper side serving as the secondary side. In this vertical installation, the valve disc is constantly subjected to a force due to its own weight, tending to move toward the primary side. In this situation, the differential pressure between the primary and secondary sides, which directs fluid from the primary side to the secondary side, may be so small that it barely pushes the valve disc upward against its own weight. In this case, the movement of the valve disc opens the connecting hole, widening the flow path and reducing the already small differential pressure. The valve disc loses support from the differential pressure and falls to the valve seat under its own weight, generating a crash noise. If the valve disc falls and blocks the valve port, the differential pressure increases, and the valve disc begins to rise again. In a low differential pressure environment between the primary and secondary sides, the valve disc repeatedly rises and falls, resulting in chattering, which can repeatedly generate a crash noise. If the impact noise generated when chattering occurs is too loud, it may cause discomfort to nearby users, and therefore it is desirable to suppress such impact noise.

[0005] An object of the present invention is to provide a valve device, a check valve, and a refrigeration cycle system that can suppress impact noise when chattering occurs in a small differential pressure environment between the primary and secondary when used in a vertically installed position. [Means for solving the problem]

[0006] In order to solve the above problems, the valve device comprises an outer tube portion formed in a cylindrical shape and arranged in a vertical position with its axial direction along the direction of gravity, a valve main body built in the outer tube portion, and a valve element provided in the valve main body, wherein the valve main body has a cylindrical valve holder that supports the valve element so as to be movable in the axial direction, and a valve seat portion that is provided with a valve port on which the valve element can be seated and that is closed by the seated valve element, and the valve element is in a valve-closed state in which it is seated on the valve seat portion, and is pushed up from the valve seat portion by a flow of fluid from a primary side, which is on the lower side in the direction of gravity, to a secondary side, which is on the upper side in the outer tube portion, in the valve-open state, and is resistant to falling under its own weight when the flow of the fluid stops, and to a state in which it is pushed up from the valve seat portion by a flow of fluid from a primary side, which is on the lower side in the direction of gravity, to a secondary side, which is on the upper side the valve holder is provided with a communication hole that penetrates the peripheral wall of the valve holder and connects the inside of the outer tube portion with the valve opening, the communication hole being blocked by the valve body until the valve body in the valve open state reaches an opening position at which the fluid can pass through the hole, and at least one of the valve holder and the valve body is provided with an escape flow path that, when the valve body transitions to the valve open state, allows the fluid to escape from the valve opening to the inside of the outer tube portion at a flow rate that is less than the flow rate when the communication hole is fully open before the valve body reaches the opening position.

[0007] In this valve device, when transitioning from a closed state to an open state, fluid is released from the valve port into the interior of the outer tube portion through a release flow path provided in at least one of the valve holder and the valve disc before the valve disc reaches the opening position of the communicating hole. This fluid release reduces the pressure difference between the primary and secondary ports before fluid can pass through the communicating hole. If the reduced pressure difference is too great to overcome the weight of the valve disc, the valve disc will fall at this stage. Even if the reduced pressure difference is sufficient to push the valve disc up against its own weight, if the pressure difference before the fluid release was small, the valve disc will fall approximately simultaneously when the valve disc reaches the opening position of the communicating hole and allows fluid to pass through. In either case, the height of the valve disc from the valve seat immediately before falling is kept low, thereby reducing impact noise when dropped. In this way, the above-described valve device can reduce impact noise when chattering occurs in an environment with a small pressure difference between the primary and secondary ports when used in a vertical position.

[0008] Furthermore, under normal conditions of differential pressure between the primary and secondary sides, the relief flow path increases the flow area of ​​the fluid from the primary side to the secondary side, thereby reducing pressure loss by increasing the flow rate.

[0009] Here, it is preferable that the axial length A from the seating surface of the valve body in the valve seat portion to the opening edge of the communicating hole be set to at least 1 / 2 of the inner radius B of the valve holder.

[0010] According to this configuration, the relief flow path can be provided with a dimensional margin between the seating surface of the valve seat portion and the opening edge of the communication hole.

[0011] It is also preferable that the relief flow path is a relief hole having a smaller hole size than the communicating hole, which penetrates the peripheral wall of the valve holder on the primary side of the communicating hole and connects the inside of the outer tube portion with the valve port.

[0012] According to this configuration, by passing through the relief hole on the primary side of the communicating hole, the fluid can be effectively released into the interior of the outer tube portion before the valve body reaches the opening position of the communicating hole, thereby reducing the pressure difference between the primary and secondary sides and suppressing the impact noise.

[0013] Further, the ratio R of the opening area of ​​the relief hole to the opening area of ​​the communication hole is 1 / 5 <R<1 / 2 It is preferable that:

[0014] With this configuration, when the pressure difference between the primary and secondary valves is normal, the pressure difference is not lowered too much before the valve element reaches the open position, and when the pressure difference is small, the height of the valve element when it falls is sufficiently suppressed, allowing the fluid to effectively escape through the relief hole.

[0015] It is also preferable that a plurality of the relief holes are provided so as to penetrate the peripheral wall of the valve holder at a plurality of locations.

[0016] According to this configuration, the fluid is dispersed and released through a plurality of release holes, so that the fluid can be released with high reliability when the valve body transitions to the valve open state.

[0017] It is also preferable 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.

[0018] With this configuration, by releasing the fluid through a plurality of release holes arranged at equal angular intervals around the circumference, the pressure drop on the primary side of the valve body when the fluid is released can be balanced.

[0019] It is also preferable that the plurality of relief holes are arranged in the peripheral wall of the valve holder so as to be aligned in the circumferential direction at a constant height from the valve orifice in the axial direction.

[0020] According to this configuration, the plurality of relief holes can be provided in a compact axial installation area on the peripheral wall of the valve holder.

[0021] It is also preferable that the relief hole be formed to have any one of a circular, rectangular, oval, elliptical, and triangular shape when viewed from the side of the peripheral wall of the valve holder.

[0022] According to this configuration, the circular, square, oval, elliptical, and triangular relief holes allow the fluid to pass through smoothly, thereby effectively reducing the pressure difference between the primary and secondary pressures.

[0023] It is also preferable that the relief flow path is an relief groove formed in the shape of a groove on at least one of the inner surface of the valve holder and the outer surface of the valve body, which allows the fluid from the valve port to pass over the valve body to the secondary side when the valve is open.

[0024] With this configuration, when the valve body transitions to the valve open state, the fluid from the valve port can be guided to the secondary side by an escape groove formed on at least one of the inner surface of the valve holder and the outer surface of the valve body, thereby effectively escaping into the interior of the outer tube portion.

[0025] In order to solve the above problem, a check valve is characterized by being constituted by the above valve device.

[0026] In order to solve the above problem, a refrigeration cycle system is characterized by including the above-mentioned check valve.

[0027] These check valves and refrigeration cycle systems all have the above-mentioned valve device configuration, and therefore can suppress the impact noise that occurs when chattering occurs in an environment with a small differential pressure between the primary and secondary when used in a vertical position. [Effects of the Invention]

[0028] The above-described valve device, check valve, and refrigeration cycle system can suppress impact noise when chattering occurs in a small differential pressure environment between the primary and secondary when used in a vertically installed position. [Brief explanation of the drawings]

[0029] [Figure 1] 1 is a cross-sectional view showing a cross section along an axial direction of a check valve configured by a valve device according to an embodiment. [Figure 2] 2 is a diagram showing a cross-sectional view of the valve body shown in FIG. 1 taken along the axial direction and a cross-sectional view of an orthogonal cross section taken along line V11-V11 in the figure relative to the axial direction. [Figure 3] FIG. 2 is an enlarged perspective view of the valve body whose cross section is shown in FIG. 1. [Figure 4] FIG. 4 is a diagram showing a cross-sectional view of the valve body shown in FIG. 3 taken along its axial direction, a top view seen from above in the axial direction, and a side view seen from a side perpendicular to the axial direction. [Figure 5] FIG. 5 is a schematic diagram showing a refrigeration cycle system including the check valve shown in FIGS. 1 to 4. [Figure 6] 6A to 6C are diagrams showing first to third modified examples of the check valve shown in FIGS. 1 to 5. [Figure 7] 1 to 5. FIG. 6 shows fourth and fifth modified examples of the check valve shown in FIGS. [Figure 8] 1 to 5. FIG. 7 is a diagram showing sixth and seventh modified examples of the check valve shown in FIGS. [Figure 9] 1 to 5. FIG. 9 is a diagram showing eighth and ninth modified examples of the check valve shown in FIGS. DETAILED DESCRIPTION OF THE INVENTION

[0030] Hereinafter, a valve device, a check valve, and a refrigeration cycle system according to one embodiment of the present invention will be described.

[0031] FIG. 1 is a cross-sectional view of a check valve configured by a valve device according to an embodiment, taken along an axial direction. FIG. 2 is a diagram illustrating a cross-sectional view of the valve body shown in FIG. 1 taken along an axial direction and a cross-sectional view of a cross-section perpendicular to the axial direction taken along line V11-V11 in the diagram. FIG. 3 is an enlarged perspective view of the valve disc shown in FIG. 1. FIG. 4 is a diagram illustrating a cross-sectional view of the valve disc shown in FIG. 3 taken along an axial direction, a top view seen from above in the axial direction, and a side view seen from a side perpendicular to the axial direction. FIG. 5 is a schematic diagram illustrating a refrigeration cycle system including the check valve shown in FIGS. 1 to 4. In the following description, the concepts of "upper" and "lower" correspond to the upper and lower in the drawing of FIG. 1. In addition, the "valve open state" described in the specification refers to a state between a state in which the valve disc is slightly open and a state in which the valve disc abuts against a valve stopper (described later) and is fully open.

[0032] The check valve 1 of this embodiment is a valve device that is installed in the middle of a flow path of a refrigerant (fluid) in a refrigeration cycle system 100, and includes an outer pipe portion 11, a valve body 12, and a valve element 13. The check valve 1 is used by arranging the cylindrically formed outer pipe portion 11 in a vertical position such that an axial direction D11 along its central axis X1 is aligned with the direction of gravity D12.

[0033] The outer pipe portion 11 is a cylindrical member extending in the axial direction D11. It is formed by drawing using a metal material such as copper. As described above, the outer pipe portion 11 is disposed in a vertical position with the axial direction D11 aligned with the direction of gravity D12. The outer pipe portion 11 includes a cylindrical main pipe portion 111 extending in the axial direction D11, a primary pipe 112 continuing from a primary-side end portion of the main pipe portion 111 on the lower side in the direction of gravity and extending to the primary side, and a secondary pipe 113 continuing from a secondary-side end portion of the main pipe portion 111 on the upper side and extending to the secondary side. In this embodiment, the main pipe portion 111, the primary pipe 112, and the secondary pipe 113 are integrally formed by drawing or the like, but they may also be formed separately and then assembled. Specifically, for example, the primary pipe 112 may be inserted into the primary-side end portion of the main pipe portion 111, and the secondary pipe 113 may be inserted into the secondary-side end portion of the main pipe portion 111, and then connected by brazing or the like. In this case, the main body pipe portion 111 may be divided into two parts in the axial direction D11, and the two parts may be fixed together by screws or welding.

[0034] Four fixing portions 111a are formed on the primary side of the main pipe portion 111, protruding radially inward. These fixing portions 111a are used to secure the valve seat portion 121 (described later) of the valve body 12, and are crimped and deformed by a punch in a press. The main pipe portion 111 houses the valve body 12. The valve body 12 includes a cylindrical valve seat portion 121 press-fitted onto the primary side inner circumferential surface of the main pipe portion 111, and a cylindrical valve holder 122 that is continuous with the secondary side end of the valve seat portion 121 and extends to the secondary side. The valve seat portion 121 is formed by cutting or other processing using a metal material such as brass. An annular recess 121a recessed radially inward is formed on the primary side of the outer circumferential surface of the valve seat portion 121, and the fixing portion 111a of the main pipe portion 111 described above is fitted and fixed into the annular recess 121a. As a result, the valve seat portion 121 is fixed at a predetermined position inside the main body pipe portion 111.

[0035] The edge around the secondary-side opening of the valve seat portion 121 forms a seating surface 121b on which the valve disc 13 can seat and which abuts against a flat abutment surface 135 of the valve disc 13. A valve port 121c penetrating in the axial direction D11 is formed in the center of the valve seat portion 121 so as to open to this seating surface 121b. The valve port 121c is closed by the valve disc 13 seated on the valve seat portion 121 and opens when the valve disc 13 is released from the seat. An inner cylindrical portion 121d contiguous with the valve port 121c forms the inner circumferential surface of the valve seat portion 121. A primary opening 121e opening to the primary side and communicating with the primary pipe 112 is formed at the end of the primary side of the inner cylindrical portion 121d. The inner diameter of the primary opening 121e is set to be approximately the same as the inner diameter of the valve port 121c.

[0036] The valve holder 122 is a cylindrical portion that accommodates the valve disc 13 within the outer tube portion 11 and supports the valve disc 13 movably in the axial direction D11. As shown in FIG. 1, a peripheral wall 122a is formed rising from the edge of the secondary side of the valve seat portion 121. An annular flat surface between the inner periphery of the end of the peripheral wall 122a on the valve seat portion 121 side and the inner edge of the opening forms a seating surface 121b. The outer diameter of the valve holder 122 is set smaller than the inner diameter of the outer tube portion 11, thereby creating a space between the valve holder 122 and the outer tube portion 11 through which fluid flows in the axial direction D11. Meanwhile, the inner diameter of the valve holder 122 is set larger than the inner diameter of the valve port 121c. Specifically, as shown in FIG. 2, an inner circumferential radius B of the valve holder 122 is set larger than a valve port radius C of the valve port 121c.

[0037] Four communication holes 122b are formed in the cylindrical peripheral wall 122a of the valve holder 122, penetrating the peripheral wall 122a in the radial direction. This allows communication between the interior of the valve holder 122 and the interior of the outer tube portion 11. That is, the communication holes 122b penetrate the peripheral wall 122a and connect the interior of the outer tube portion 11 to the valve port 121c. The communication holes 122b are circular in a side view of the peripheral wall 122a of the valve holder 122 from the direction of the through holes, and multiple communication holes 122b are provided at equal intervals in the circumferential direction D13 of the valve holder 122. Specifically, the four communication holes 122b are arranged at equal angular intervals (90° intervals) in the circumferential direction D13. 2, the length A in the axial direction D11 between the seating surface 121b and the primary-side opening edge 122b-1 of the communication hole 122b is set to be equal to or greater than half the length of the inner circumferential radius B of the above-mentioned valve holder 122. Furthermore, the peripheral wall 122a of the valve holder 122 is also formed with a relief hole 122c as a relief flow path, which will be described later, and this relief hole 122c will be described again later.

[0038] Furthermore, a substantially 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 prevents the valve disc 13 it abuts from moving toward the secondary side, and determines the extreme position of the valve disc 13's movement toward the secondary side. Here, we will describe the flow path and flow behavior in the check valve 1 when the valve is open. When fluid is forced upward from the primary pipe 112 toward the outer pipe portion 11, the valve disc 13 lifts off its valve seat due to the fluid pressure difference and rises. When the fluid rises, it flows from the valve port 121c from the lower end surface (contact surface 135) of the valve body 13 toward the upper circumferential direction of the valve body 13, branches into four locations in the four communicating holes 122b of the valve holder 122, and flows through the communicating holes 122b.The fluid then passes through the space between the outer periphery of the valve holder 122 and the inner periphery of the outer tube portion 11, and flows into the secondary tube 113 on the secondary side of the outer tube portion 11, which is downstream in the axial direction D11.

[0039] The valve disc 13 is a resin member provided within the valve holder 122 of the valve body 12 so as to be slidable in the axial direction D11. The valve disc 13 has four grooves 132 extending in the axial direction D11 in a substantially cylindrical valve disc main body 131, and is formed so that the cross section intersecting the axial direction D11 has a substantially cross shape. The formation of the grooves 132 reduces the sliding resistance of the valve disc 13 relative to the valve holder 122 in the axial direction D11, allowing the valve disc 13 to slide smoothly. A lightening portion 133 is formed in the center of the valve disc main body 131 of the valve disc 13, which is lightened so as not to penetrate from the center of the end face on the secondary side to the primary side. This lightening portion 133 suppresses the occurrence of sink marks, air bubbles, etc. during resin molding of the valve disc 13 and contributes to reducing the weight of the valve disc 13. The primary side end of the valve body main body 131 forms a disk-shaped bottom plate portion 134, and the lower end surface of the bottom plate portion 134 forms a flat abutment surface 135 that abuts against the flat seating surface 121b of the valve seat portion 121.

[0040] The check valve 1 configured as described above operates as follows, for example, in the vertically installed position shown in FIG. 1 . First, when the valve disc 13 is seated on the valve seat 121 and the abutment surface 135 and the seating surface 121b are in contact with each other, in the closed valve state, fluid flows in the forward direction from the primary pipe 112 to the secondary pipe 113. Then, the flow of fluid out of the valve port 121c pushes the valve disc 13 up from the valve seat 121, resulting in an open valve state. In this open valve state, the valve disc 13 moves up to its extreme end position where it abuts against the valve stopper 123, and when it abuts against the valve stopper 123, its movement toward the secondary side is restricted. When the flow of fluid in the forward direction stops, the valve disc 13 falls under its own weight and again seats on the valve seat 121, returning to the closed valve state. Furthermore, if there is a backflow from the secondary side after or at the same time as the flow in the forward direction stops, the valve will return to the closed state due to the combination of the downward pressure caused by the backflow from the secondary side and the drop due to its own weight.

[0041] In this embodiment, as described above, the relief hole 122c serving as a relief flow path for the fluid is formed in the peripheral wall 122a of the valve holder 122. Fig. 2 shows a cross-sectional view taken along the line V11-V11 passing through the relief hole 122c.

[0042] First, the bypass flow path mentioned here is a flow path that allows fluid to escape from the valve port 121c to the inside of the outer pipe portion 11 at a flow rate less than the flow rate at the full opening of the communication hole 122b before the lower end surface of the valve body 13 reaches the opening position P11 described below when the valve body 13 transitions to the above-described valve-open state. The opening position P11 is a position where the valve body 13 moves to the secondary side and the contact surface 135 of the valve body 13 allows fluid to pass through the communication hole 122b beyond the opening edge 122b-1 on the primary side in the communication hole 122b. That is, in the present embodiment, when the valve body 13 separates from the valve seat portion 121 and transitions to the valve-open state, the fluid flowing out from the valve port 121c is allowed to escape to the inside of the outer pipe portion 11 through the bypass flow path at the above-mentioned small flow rate before passing through the communication hole 122b. And in the present embodiment, this bypass flow path is a bypass hole 122c that penetrates the peripheral wall 122a of the valve holder 122 on the primary side of the communication hole 122b and communicates the inside of the outer pipe portion 11 with the valve port 121c, and has a smaller hole size than the communication hole 122b. Specifically, the hole size of the bypass hole 122c is set such that the opening area ratio R of the opening area of the bypass hole 122c to the opening area of the communication hole 122b is 1 / 5 < R < 1 / 2.

[0043] The bypass holes 122c are formed to be circular in a side view looking at the peripheral wall 122a of the valve holder 122, similar to the communication holes 122b, and a plurality of bypass holes 122c are provided to penetrate the peripheral wall 122a at multiple locations. Specifically, four bypass holes 122c are arranged at an equal angular interval (90° interval) corresponding one-to-one on the primary side with the four communication holes 122b in the circumferential direction D13. Further, these four bypass holes 122c are arranged on the peripheral wall 122a of the valve holder 122 to be aligned in the circumferential direction D13 at a certain height from the valve port 121c in the axial direction D11.

[0044] The check valve 1 described above is installed in a refrigerant flow path in a refrigeration cycle system 100, as shown in FIG. 5 . The refrigeration cycle system 100 is used in, for example, an air conditioner such as a commercial air conditioner. The refrigeration cycle system 100 includes 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, all connected by 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 on the primary pipe 112 side and the four-way valve 104 on the secondary pipe 113 side. During cooling operation, as indicated by solid arrow D101, the refrigerant is compressed by the compressor 105 and then flows through the check valve 1 and the four-way valve 104 to the outdoor heat exchanger 102. After releasing heat in the outdoor heat exchanger 102, the refrigerant flows through the expansion valve 103 to the indoor heat exchanger 101, and the refrigerant that has absorbed heat in the indoor heat exchanger 101 returns to the compressor 105 via the four-way valve 104.

[0045] During heating operation, as indicated by dotted arrow D102, the refrigerant is compressed by the compressor 105 and flows through the check valve 1 and four-way valve 104 to the indoor heat exchanger 101. After releasing heat in the indoor heat exchanger 101, the refrigerant passes through the expansion valve 103 to the outdoor heat exchanger 102. After absorbing heat in the outdoor heat exchanger 102, the refrigerant returns to the compressor 105 through the four-way valve 104. The refrigeration cycle system 100 repeats this cycle to cool or heat the room. For example, under conditions of high cooling load, three compressors 105 are operated simultaneously, and each of the three check valves 1 is fully open. Under conditions of low cooling load, operation of only one compressor 105 is sufficient, and the other two compressors 105 are not operated. At this time, the pressure on the secondary pipe 113 side of the two check valves 1 becomes higher than the pressure on the primary pipe 112 side, causing backflow from the secondary pipe 113 side, and the two check valves 1 become closed.

[0046] At this time, the pressure difference between the primary and secondary sides of the check valve 1, which directs fluid from the primary side to the secondary side, may become so slight that it barely pushes up the valve element 13 against its own weight. In such a slight pressure difference environment, the valve element 13 is pushed up until the pressure difference becomes so great that it can no longer resist its own weight, and then it falls onto the valve seat 121, generating a collision noise. When the valve element 13 falls, the valve opening 121c is blocked, the pressure difference increases, and the valve element rises again. In a slight pressure difference environment between the primary and secondary sides, chattering occurs, in which the valve element 13 repeatedly rises and falls, and this may generate multiple collision noises. If the collision noise caused by such chattering is too loud, it may cause discomfort to nearby users. In the check valve 1 (valve device) and refrigeration cycle system 100 of the above-described embodiment, the valve holder 122 is provided with the relief hole 122c as a relief flow path, which has the effect described below and can suppress collision noise when chattering occurs.

[0047] That is, in this embodiment, when transitioning from the valve closed state to the valve open state, the fluid is released from the valve port 121c into the interior of the outer tube portion 11 through the release hole 122c, which serves as a release flow path, provided in the valve holder 122 before the lower end face of the valve disc 13 reaches the opening position P11 of the communicating hole 122b. This release of fluid reduces the pressure difference between the primary and secondary sides before the fluid can pass through the communicating hole 122b. If the reduced pressure difference is too great to resist the weight of the valve disc 13, the valve disc 13 will drop at this stage. Furthermore, even if the reduced pressure difference is sufficient to lift the valve disc 13 against its own weight, if the pressure difference before the fluid release was originally a small pressure difference, the valve disc 13 will drop approximately simultaneously with the lower end face of the valve disc 13 reaching the opening position P11 of the communicating hole 122b and allowing the fluid to pass through. In either case, the height of the lower end surface (contact surface 135) of the valve disc 13 from the seating surface 121b of the valve seat portion 121 immediately before it falls is kept lower than the maximum height of the contact surface 135 relative to the seating surface 121b when it abuts against the valve stopper 123, thereby reducing the impact noise when it falls. Thus, according to this embodiment, the impact noise caused by chattering in a small differential pressure environment between the primary and secondary air conditioners when used in the vertical installation position can be reduced. Furthermore, in the above description, chattering occurs when the valve is used in the commercial air conditioner shown in FIG. 5, generating the impact noise. However, the same problem occurs in check valves in refrigeration cycle systems other than the system shown in FIG. 5. Even in this case, the above-described configuration can solve the problem and reduce the impact noise caused by chattering.

[0048] Furthermore, the relief hole 122c as the relief flow path increases the flow path area of ​​the fluid from the primary side to the secondary side under normal conditions of differential pressure between the primary and secondary sides, and therefore the pressure loss can be reduced by increasing the flow rate.

[0049] Here, in the present embodiment, the length A in the axial direction D11 from the seating surface 121b of the valve body 13 in the valve seat portion 121 to the opening edge 122b-1 on the primary side of the communication hole 122b is set to be 1 / 2 or more of the inner peripheral radius B of the valve holder 122. According to this configuration, a relief hole 122c as a relief 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 communication hole 122b.

[0050] Also, in the present embodiment, the relief flow path is a relief hole 122c provided on the primary side of the communication hole 122b and having a smaller hole dimension than the communication hole 122b. According to this configuration, by passing through the relief hole 122c on the primary side of the communication hole 122b, the fluid can be effectively discharged to the inside of the outer pipe portion 11 before the lower end surface of the valve body 13 reaches the opening position P11 of the communication hole 122b, reducing the differential pressure between the primary and secondary sides and suppressing the collision sound.

[0051] Also, in the present embodiment, the opening area ratio R of the opening area of the relief hole 122c to the opening area of the communication hole 122b is set such that 1 / 5 < R < 1 / 2. According to this configuration, the differential pressure between the primary and secondary sides does not overly reduce the differential pressure before the lower end surface of the valve body 13 reaches the opening position P11 under normal environmental conditions, and the fluid can be effectively discharged from the relief hole 122c to sufficiently suppress the height of the valve body 13 during falling in a micro differential pressure environment.

[0052] Also, in the present embodiment, a plurality of, specifically four, relief holes 122c are provided. According to this configuration, by dispersing and discharging the fluid through the four relief holes 122c, the fluid can be discharged with high certainty when the valve body 13 transitions to the valve-open state.

[0053] Also, in the present embodiment, the four relief holes 122c are arranged at an equal angular interval of 90° in the circumferential direction D13. According to this configuration, by discharging the fluid from the four relief holes 122c arranged at an equal angular interval in the circumferential direction D13, the pressure drop on the primary side of the valve body 13 when the fluid is discharged can be balanced.

[0054] In this embodiment, the four relief holes 122c are arranged in the axial direction D11 so as to be aligned in the circumferential direction D13 at a constant height from the valve port 121c. This configuration allows the four relief holes 122c to be arranged together in a compact installation area in the axial direction D11 on the peripheral wall 122a of the valve holder 122.

[0055] In this embodiment, the relief hole 122c is formed to have a circular shape in a side view of the peripheral wall 122a of the valve holder 122. With this configuration, the circular relief hole 122c allows the fluid to pass through smoothly, effectively reducing the pressure difference between the primary and secondary pressures.

[0056] Next, various modifications of the above-described embodiment will be described.

[0057] Figure 6 shows first to third modified examples of the check valve shown in Figures 1 to 5. Figure 6(A) shows the first modified example, Figure 6(B) shows the second modified example, and Figure 6(C) shows the third modified example. In Figure 6, components equivalent to those shown in Figure 2 are shown with the same reference numerals as in Figure 2 only if they are necessary for explanation, and hereinafter, redundant explanations of these equivalent components will be omitted.

[0058] The three modified examples shown in Fig. 6 differ from the above-described embodiment in the relief holes 252c, 262c, and 272c in the valve holder 122 of the valve bodies 25, 26, and 27. Fig. 6(A) shows a cross-sectional view of the valve body 25 of the first modified example taken along the axial direction D11 and an orthogonal cross-sectional view taken along line V251-V251 passing through the relief hole 252c in the figure. Fig. 6(B) shows a cross-sectional view of the valve body 26 of the second modified example taken along the axial direction D11 and an orthogonal cross-sectional view taken along line V261-V261 passing through the relief hole 262c in the figure. Fig. 6(C) shows a cross-sectional view of the valve body 27 of the third modified example taken along the axial direction D11 and an orthogonal cross-sectional view taken along line V271-V271 passing through the relief hole 272c in the figure.

[0059] The relief hole 252c of the first modified example shown in Fig. 6(A) is formed to be rectangular in side view, and the relief hole 262c of the second modified example shown in Fig. 6(B) is formed to be oval with the axial direction D11 as the major axis in side view. The relief hole 272c of the third modified example shown in Fig. 6(C) is formed to be circular in side view, but has a smaller diameter than the relief hole 122c of the embodiment shown in Fig. 2.

[0060] In the first to third modified examples described above, as in the above-described embodiment, it goes without saying that by providing the relief holes 252c, 262c, 272c, it is possible to suppress the impact noise that occurs when chattering occurs in an environment of slight differential pressure between the primary and secondary when used in a vertical position.

[0061] Furthermore, in the first and second modified examples in which non-circular relief holes 252c, 262c are provided, the fluid can pass through smoothly, effectively reducing the pressure difference between the primary and secondary sides, just like the circular relief holes 122c, 272c in the above-mentioned embodiment and third modified example.

[0062] The non-circular relief holes are not limited to the rectangular relief holes 252c of the first modified example or the oval relief holes 262c of the second modified example, but may be formed to have an elliptical or triangular shape in side view. In the second modified example, the relief holes are formed to have an oval shape with the axial direction D11 as the major axis in side view, but may also be formed to have a horizontally long oval shape with the axial direction D11 as the minor axis in side view.

[0063] Figure 7 shows fourth and fifth modified examples of the check valve shown in Figures 1 to 5. Figure 7(A) shows the fourth modified example, and Figure 7(B) shows the fifth modified example. In Figure 7, components equivalent to those shown in Figure 2 are shown with the same reference numerals as in Figure 2 only if they are necessary for explanation, and duplicate explanations of these equivalent components will be omitted below.

[0064] The two modified examples shown in Fig. 7 differ from the above-described embodiments in the relief holes 352c, 362c in the valve holder 122 of the valve bodies 35, 36. Fig. 7(A) shows a cross-sectional view of the valve body 35 of the fourth modified example taken along the axial direction D11 and an orthogonal cross-sectional view taken along the line V351-V351 passing through the relief hole 352c in the figure. Fig. 7(B) shows a cross-sectional view of the valve body 36 of the fifth modified example taken along the axial direction D11 and an orthogonal cross-sectional view taken along the line V361-V361 passing through the relief hole 362c in the figure.

[0065] 7A, the number and arrangement of the relief holes 352 provided in the circumferential direction D13 of the relief holes 352c of the fourth modified example is different from that of the above-described embodiment. In this modified example, three relief holes 352c are arranged at equal angular intervals of 120°. One of the three relief holes 352c is arranged directly below the communicating hole 122b, while the remaining two are arranged at positions offset from the communicating hole 122b in the circumferential direction D13.

[0066] 7(B), the number of relief holes 362c in the circumferential direction D13 is four, the same as in the above-described embodiment, but the arrangement of the relief holes 362c is different from that of the above-described embodiment. In this modification, the four relief holes 362c are arranged at equal angular intervals of 90°, but each relief hole 362c is arranged offset in the circumferential direction D13 from the communication hole 122b by an angular interval of 45°.

[0067] In the fourth and fifth modified examples described above, as in the above-described embodiment, it goes without saying that by providing the relief holes 352c, 362c, it is possible to suppress the impact noise that occurs when chattering occurs in an environment of slight differential pressure between the primary and secondary when used in the vertical position.

[0068] FIG. 8 shows sixth and seventh modified examples of the check valves shown in FIGS. 1 to 5. FIG. 8(A) shows the sixth modified example, and FIG. 8(B) shows the seventh modified example. In FIG. 8, components equivalent to those shown in FIG. 4 are designated by the same reference numerals as in FIG. 4 only when necessary for explanation. In the following description, duplicated explanations of these equivalent components will be omitted. In the following description, reference will be made to the components shown in FIG. 1 as appropriate. In the case of the valve discs 45 and 46 of the sixth and seventh modified examples, the valve body is different from the valve body 12 of the first embodiment in that the valve discs 45 and 46 are provided with relief grooves 451 and 461, respectively, and therefore does not have a relief hole 122c. The valve discs 45 and 46 may also be combined with the valve bodies of the first to fifth modified examples, which have relief holes, or the valve bodies of the eighth and ninth modified examples, which have relief grooves, as described below. In this case, in addition to the relief groove in the valve disc, the relief holes and relief grooves on the inner periphery of the valve holder also increase as flow paths, so the increased relief space reduces pressure loss and improves flow rate.

[0069] The two modified examples shown in Fig. 8 differ from the above-described embodiment in that relief flow paths are provided in both valve bodies 45, 46. Fig. 8(A) shows a cross-sectional view of a valve body 45 of a sixth modified example along the axial direction D11, a top view seen from above in the axial direction D11, and a side view seen from a side perpendicular to the axial direction D11, all aligned together. Similarly, Fig. 8(B) shows a cross-sectional view of a valve body 46 of a seventh modified example along the axial direction D11, a top view seen from above in the axial direction D11, and a side view seen from a side perpendicular to the axial direction D11, all aligned together.

[0070] In the sixth modified example shown in Fig. 8(A) and the seventh modified example shown in Fig. 8(B), the relief flow paths are relief grooves 451, 461 formed on the outer peripheral surfaces of the valve bodies 45, 46. Fig. 8(A) shows a cross-sectional view along the axial direction D11, taken along line V451-V451 in the figure, which passes through relief groove 451. Similarly, Fig. 8(B) also shows a cross-sectional view along line V461-V461 in the figure, which passes through relief groove 461.

[0071] When the valve body 45 shown in Figure 8(A) is used in a valve body in which only the communicating hole 122b, without any relief holes 122c, 252c, 262c, 272c, 352c, 362c, as in one embodiment and the first to fifth modified examples, is open in the circumferential direction of the valve holder, the relief groove 451 of the sixth modified example shown in Figure 8(A) is a groove-shaped portion formed on the outer peripheral surface of the disc-shaped bottom plate portion 134 along the axial direction D11. When the valve element 45 lifts off the seating surface 121b and transitions to the valve open state, the fluid from the valve port 121c that has entered between the bottom plate portion 134 and the seating surface 121b passes through the relief grooves 451 on its outer peripheral surface in the axial direction D11, over the bottom plate portion 134 of the valve element 45, and is released to the secondary side through the communication hole 122b and / or from the inside of the valve holder 122 through the inner periphery of the valve stopper 123. In the sixth modified example, four relief grooves 451 are arranged on the outer peripheral surface of the bottom plate portion 134 at equal angular intervals of 90° in the circumferential direction D13.

[0072] 8(B) is used in a valve body in which only the communication hole 122b is open in the circumferential direction of the valve holder, without any relief holes 122c, 252c, 262c, 272c, 352c, or 362c, as in one embodiment and the first to fifth modified examples. The relief groove 461 of the seventh modified example shown in Fig. 8(B) is a groove-shaped portion formed along the axial direction D11 from the end faces of the four vane-shaped ribs 462 that define the four grooves 132 on the outer peripheral surface of the valve body 131 to the outer peripheral surface of the bottom plate portion 134. When the valve body 46 lifts off the seating surface 121b and transitions to the valve open state, the fluid that has entered between the bottom plate portion 134 and the seating surface 121b from the valve port 121c enters the relief groove 461 that extends from the bottom plate portion 134 to the vane-shaped rib 462. The fluid then passes through this relief groove 461, passes over the valve element 46 in the axial direction D11, and is released to the secondary side from the communication hole 122b and / or from the inside of the valve holder 122 through the inner periphery of the valve stopper 123. In the seventh modified example, a total of four relief grooves 461 are formed, one for each of the four feather-shaped ribs 462.

[0073] In the sixth and seventh modified examples described above, the same effect as in the above-described embodiment can be obtained by providing the relief grooves 451, 462 as relief flow paths for the fluid. That is, it goes without saying that the sixth and seventh modified examples can also suppress the impact noise that occurs when chattering occurs in an environment with a slight differential pressure between the primary and secondary components when used in the vertical installation position.

[0074] In addition, in the sixth and seventh variants, when the valve bodies 45, 46 transition to the valve open state, the fluid from the valve port 121c can be effectively released into the interior of the outer tube portion 11 by guiding it to the secondary side through the above-mentioned escape grooves 451, 461.

[0075] Figure 9 shows eighth and ninth modified examples of the check valve shown in Figures 1 to 5. Figure 9(A) shows the eighth modified example, and Figure 9(B) shows the ninth modified example. In Figure 9, components equivalent to those shown in Figure 2 are shown with the same reference numerals as in Figure 2 only if they are necessary for the explanation, and hereinafter, redundant explanations of these equivalent components will be omitted. In the following explanation, the components shown in Figure 1 will be referred to as appropriate.

[0076] In the two modified examples shown in Fig. 9, relief passages are provided in valve bodies 55, 56, but the relief passages are relief grooves 551, 561 provided in the inner peripheral surface of valve holder 122 rather than relief holes. Fig. 9(A) shows an orthogonal cross section of valve body 55 of the eighth modified example taken along line V551-V551 that intersects with relief groove 551. On the other hand, Fig. 9(B) shows a top view of valve body 56 of the ninth modified example, showing the end of relief groove 561 that extends to secondary-side end opening 122d as described below.

[0077] 9(A) shows an eighth modified example in which a relief groove 551 is 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 around the valve orifice 121c in the valve seat portion 121 to the primary-side opening edge 122b-1 of the communication hole 122b. When the valve disc 13 lifts off the seating surface 121b and transitions to the valve open state, the fluid from the valve orifice 121c that has entered between the bottom plate portion 134 and the seating surface 121b is guided through the relief groove 551 in the axial direction D11, past the valve disc 13, and into the communication hole 122b. The fluid is then released from the communication 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 the four communication holes 122b in a one-to-one correspondence, at equal angular intervals of 90° in the circumferential direction D13.

[0078] 9(B) , a relief groove 561 of the ninth modification is also formed on the inner circumferential surface of the peripheral wall 122a of the valve holder 122. This relief groove 561 extends along the axial direction D11 from the seating surface 121b around the valve orifice 121c in the valve seat portion 121, through the spaces between the communication holes 122b, to the secondary-side end opening 122d. When the valve disc 13 lifts off the seating surface 121b and transitions to the valve open state, the fluid from the valve orifice 121c that has entered between the bottom plate portion 134 and the seating surface 121b is guided through the relief groove 561 in the axial direction D11, past the valve disc 13, to the secondary-side end opening 122d. The fluid is then released from this end opening 122d to the secondary side of the outer tube portion 11. In the ninth modification, four relief grooves 561 are arranged at equal angular intervals of 90° in the circumferential direction D13 so as to pass between the four communication holes 122b.

[0079] In the eighth and ninth modified examples described above, the same effect as in the above-described embodiment can be obtained by providing the relief grooves 551, 562 as relief flow paths for the fluid. That is, it goes without saying that the eighth and ninth modified examples can also suppress the impact noise that occurs when chattering occurs in an environment with a slight differential pressure between the primary and secondary when used in the vertical installation position.

[0080] In the eighth and ninth modified examples, the relief flow paths are relief grooves 551, 562 formed in the inner peripheral surface of the valve holder 122 in a groove shape that allows fluid from the valve port 121c to pass over the valve disc 13 to the secondary side when the valve is open. According to this configuration, when the valve disc 13 transitions to the valve open state, the fluid from the valve port 121c is guided by the relief grooves 551, 562 to pass over the valve disc 13 to the secondary side, thereby allowing the fluid to effectively escape into the interior of the outer tube portion 11.

[0081] The above-described embodiment and the first to ninth modifications merely show typical forms of the present invention, and the present invention is not limited thereto. That is, various modifications can be made without departing from the gist of the present invention. As long as such modifications still comprise the valve device, check valve, and refrigeration cycle system configuration of the present invention, they are of course included in the scope of the present invention.

[0082] For example, in the above-described embodiment and the first to ninth modifications, a check valve 1 used in an air conditioner such as a commercial air conditioner is exemplified as an example of a valve device. However, the valve device is not limited to this, and may be a valve device other than a check valve. Furthermore, even when applied to a check valve, the check valve may be used not only in commercial air conditioners but also in residential air conditioners, and not only in air conditioners but also in various freezers, refrigerators, and the like. Furthermore, even when incorporated into a refrigeration cycle system as a check valve, its incorporation is not limited to the discharge side of the compressor 105 shown in FIG. 5 , but it can be applied to prevent backflow in various locations in various refrigeration cycle systems. Furthermore, there are a wide variety of refrigerants available for each refrigeration cycle system (e.g., various fluorocarbon-based refrigerants, hydrocarbon-based refrigerants, and natural refrigerants such as CO2 and ammonia). The check valve can be applied to refrigeration cycle systems compatible with any of these refrigerants.

[0083] Furthermore, in the above-described embodiment and the first to ninth modified examples, the valve body 12 is exemplified as an example of the valve body, in which the length A from the seating surface 121b of the valve seat portion 121 to the primary-side opening edge 122b-1 of the communicating hole 122b is set to at least half the inner circumferential 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-side opening edge of the communicating hole can be set to any length. However, as described above, by setting the length A from the seating surface 121b to the primary-side opening edge 122b-1 of the communicating hole 122b to at least half the inner circumferential radius B of the valve holder 122, it is possible to provide a relief flow path with a dimensional margin.

[0084] Furthermore, in the above-described embodiment and the first to fifth modified examples, the relief holes 122c, ..., 362c provided in the valve holder 122 are exemplified as an example of a relief flow path. Furthermore, as an example of a relief flow path, the sixth and seventh modified examples exemplified the relief grooves 451, 461 provided in the valve discs 45, 46, and the eighth and ninth modified examples exemplified the relief grooves 551, 561 provided in the valve holder 122. However, the relief flow path is not limited to these. The specific form of the relief flow path is not important as long as it allows fluid to escape from the valve opening to the inside of the outer tube portion at a flow rate that is less than the flow rate when the communicating hole is fully open before the lower end surface of the valve disc reaches the opening position of the communicating hole when the valve disc transitions to the valve open state. However, as described above, the fluid can be effectively released into the interior of the outer tube portion by the relief holes 122c, ..., 272c of the valve holder 122, the relief grooves 451, 461 of the valve discs 45, 46, and the relief grooves 551, 561 of the valve holder 122. The location where the relief flow path is formed is not limited to either the valve holder or the valve disc, as long as it is provided in at least one of them, and it may be provided in both the valve holder and the valve disc.

[0085] In the above-described embodiments and the first to fifth modification examples, as an example of the relief holes, relief holes 122c, ···, 362c are exemplified in which the opening area ratio R with respect to the opening area of the communication hole 122b is set to 1 / 5 < R < 1 / 2. However, the relief holes are not limited to this. If the hole size is smaller than that of the communication hole, the opening area ratio can be appropriately set, for example, to 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, the differential pressure is not overly reduced under normal differential pressure environments, and the fluid can be effectively released to such an extent that the height of the valve body during the fall is sufficiently suppressed under a micro differential pressure environment, as described above. Therefore, the relief holes set to 1 / 5 < R < 1 / 2 as described above are the best mode, but even if they are set to 1 / 10 < R < 1 / 2, although slightly inferior to the best mode, the same effect can be obtained. Also, even if they are set to 1 / 100 < R < 1 / 2, the effect is reduced but a certain degree of effect can be obtained.

[0086] In the above-described embodiments and the first to fifth modification examples, as an example of the relief holes, relief holes 122c, ···, 362c provided in a plurality, such as three or four, are exemplified. However, the relief holes are not limited to this, and it may be possible to provide only one relief hole. However, as described above, with a plurality of relief holes 122c, ···, 362c, the flow path can be dispersed and the fluid can be released with high certainty. Note that even when a plurality are provided, the specific number is not limited.

[0087] In the above-described embodiments and the first to fifth modification examples, as an example of the plurality of relief holes, relief holes 122c, ···, 362c arranged at equal angular intervals in the circumferential direction D13 are exemplified. However, the plurality of relief holes are not limited to this, and they may be arranged such that the angular intervals are uneven. However, as described above, with the relief holes 122c, ···, 362c arranged at equal angular intervals, the pressure drop on the primary side of the valve body 13 when the fluid is released can be balanced.

[0088] Furthermore, in the above-described embodiment and the first to fifth modified examples, the relief holes 122c,...,362c arranged to be aligned in the circumferential direction D13 at a constant height from the valve orifice 121c are exemplified as an example of the plurality of relief holes. However, the plurality of relief holes is not limited to this, and may be arranged so that their heights from the valve orifice are uneven. However, as described above, the relief holes 122c,...,362c aligned at a constant height can be arranged to compactly arrange the installation area in the axial direction D11.

[0089] In addition, in the above-described embodiment and the first to fifth modified examples, the relief holes 122c,...,362c formed to have any one of a circular, rectangular, oval, elliptical, and triangular shape in side view are exemplified as examples of relief holes. However, the relief holes are not limited to this, and the hole shape may be a polygon other than a triangle or a square (including a trapezoid or a diamond), a star, or the like, and the specific shape is not important. However, as described above, the relief holes 122c,...,362c formed to have any one of a circular, rectangular, oval, elliptical, and triangular shape allow the fluid to pass smoothly, thereby effectively reducing the pressure difference between the primary and secondary components.

[0090] Furthermore, in the above-described embodiment and the first to fifth modified examples, it was described that the "outer tube portion is disposed in a vertical position with its axial direction aligned with the direction of gravity." However, even if the axial direction is not parallel to the direction of gravity, as long as the valve disc can fall under its own weight, even if the axial direction is slightly tilted with respect to the direction of gravity, it is considered to be substantially aligned with the direction of gravity and is included in this application. For example, if the secondary tube 113 of the outer tube portion 11 is tilted within ±15° from the vertical (tilt 0°), the valve disc can fall under its own weight, and this is included. Furthermore, even if the secondary tube 113 is tilted within ±30°, the valve disc can fall under its own weight, and this is included.

[0091] Furthermore, in the above-described embodiment and the first to fifth modified examples, no biasing member (coil spring) is provided to bias the valve body in the valve closing direction, but a biasing member (coil spring, etc.) may be provided to bias the valve body in the valve closing direction. In this case, unlike the present application, it is possible to use the valve device in a manner that does not limit the mounting position to the vertical position. [Explanation of symbols]

[0092] 1. Check valve (valve device) 11 Outer tube part 12, 25, 26, 27, 35, 36, 55, 56 Valve body 13, 45, 46 Valve body 100 Refrigeration Cycle System 101 Indoor heat exchanger 102 Outdoor heat exchanger 103 Expansion valve 104 Four-way valve 105 Compressor 111 Main body pipe section 112 Primary pipe 113 Secondary pipe 121 Valve seat 121a Annular recess 121b seating surface 121c Benguchi 121d Inner cylinder part 121e Primary opening 122 Valve holder 122a Peripheral wall 122b Communication hole 122b-1 Opening edge 122c, 252c, 262c, 272c, 352c, 362c Relief hole (relief flow path) 122d End opening 123 Valve stopper 131 Valve body 132 Groove 133 Hollowed-out section 134 Bottom plate part 135 Contact surface 451, 461, 551, 561 Relief groove (relief flow path) 462 Pinnate rib A. Length B Inner radius C Valve radius D11 Axial direction D12 Gravity direction D13 Circumferential direction D101 Solid Arrow D102 Dotted Arrow X1 center axis

Claims

1. A valve device comprising: an outer tube portion formed in a cylindrical shape and arranged in a vertical position with its axial direction aligned with the direction of gravity; a valve body built into the outer tube portion; and a valve element provided in the valve body, the valve body includes a cylindrical valve holder that supports the valve element so as to be movable in the axial direction, and a valve seat portion that is provided with a valve port on which the valve element can be seated and that is closed by the seated valve element, the valve element is configured to be in a valve-closed state seated on the valve seat portion when pushed up from the valve seat portion by a flow of fluid from a primary side, which is a lower side in the direction of gravity, to a secondary side, which is an upper side in the outer tube portion, to thereby enter a valve-open state, and to return to the valve-closed state by at least one of dropping due to its own weight when the flow of fluid stops and being pushed down by a backflow from the secondary side, the valve holder is provided with a hole that penetrates a peripheral wall of the valve holder and communicates the inside of the outer tube portion with the valve port, the communication hole being blocked by the valve body until the valve body in the valve open state reaches an opening position at which the fluid can pass through the hole, a valve device characterized in that at least one of the valve holder and the valve body is provided with an escape flow path that, when the valve body transitions to the valve open state, allows the fluid to escape from the valve port to the inside of the outer tube portion at a flow rate that is less than the flow rate when the communicating hole is fully open before the valve body reaches the opening position.

2. 2. The valve device according to claim 1, wherein the axial length A from the seating surface of the valve body in the valve seat portion to the opening edge of the communicating hole is set to be equal to or greater than 1 / 2 of the inner radius B of the valve holder.

3. 2. The valve device according to claim 1, wherein the relief flow path is a relief hole having a hole size smaller than that of the communicating hole, which penetrates the peripheral wall of the valve holder on the primary side of the communicating hole and connects the inside of the outer tube portion with the valve port.

4. An opening area ratio R of the opening area of ​​the relief hole to the opening area of ​​the communication hole is 1 / 5<R<1 / 2 4. The valve device according to claim 3, wherein:

5. 4. The valve device according to claim 3, wherein a plurality of the relief holes are provided so as to penetrate the peripheral wall of the valve holder at a plurality of locations.

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

7. 6. The valve device according to claim 5, wherein the plurality of relief holes are arranged in the peripheral wall of the valve holder so as to be aligned in the circumferential direction at a constant height from the valve orifice in the axial direction.

8. 4. The valve device according to claim 3, wherein the relief hole is formed to have any one of a circular, rectangular, oval, elliptical, and triangular shape when viewed from the side of the peripheral wall of the valve holder.

9. 2. The valve device according to claim 1, wherein the relief flow path is a relief groove formed in at least one of the inner peripheral surface of the valve holder and the outer peripheral surface of the valve body in a groove-like shape that allows the fluid from the valve port to pass over the valve body to the secondary side in the valve open state.

10. A check valve comprising the valve device according to any one of claims 1 to 9.

11. A refrigeration cycle system comprising the check valve according to claim 10.

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