JP4879713B2 - Check valve - Google Patents

Description

  The present invention relates to a check valve that is provided in the middle of a flow path through which fluid can pass and opens and closes according to fluid pressure.

Conventionally, as this type of check valve, as shown in FIG. 7 , an open end of a cylindrical wall 1 with a bottom is fitted and fixed to a valve seat wall 2 having a valve hole 3, and the inside of the cylindrical wall 1 is fixed. It is known that the valve body 5 accommodated is biased toward the valve seat wall 2 by a coil spring 6 to close the valve hole 3. This check valve is provided with a triangular peripheral surface discharge hole 4 penetratingly formed in the cylindrical wall 1, and when the valve body 5 moves straight away from the valve seat wall 2 inside the cylindrical wall 1, the valve hole 3 Is opened and the valve hole 3 and the peripheral surface discharge hole 4 are opened, so that the fluid flows from the valve hole 3 to the peripheral surface discharge hole 4 and passes through the check valve (for example, refer to Patent Document 1). .
JP 2000-346217 A (Claim 4, paragraph [0014], FIG. 3)

  By the way, in the above-described conventional check valve, the increase rate of the opening area of the peripheral surface discharge hole 4 increases as the valve body 5 moves away from the valve seat wall 2 by making the peripheral surface discharge hole 4 triangular. ing. Thereby, when the distance between the valve body 5 and the valve seat wall 2 is relatively small, the amount of change in the opening area of the peripheral surface discharge hole 4 corresponding to the direct movement of the valve body 5 becomes small, and hunting is suppressed. When the distance between the valve body 5 and the valve seat wall 2 is relatively large, the amount of change in the opening area of the peripheral surface discharge hole 4 corresponding to the direct movement of the valve body 5 increases, and the responsiveness is improved. To do. However, in the above-described conventional check valve, the peripheral surface discharge hole 4 has a triangular shape, so that it is difficult to process and the manufacturing cost is high.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a check valve that can be manufactured at a lower cost than in the past.

In order to achieve the above object, the check valve (20) according to the invention of claim 1 includes a valve seat wall (22) having a valve hole (26) through which a fluid can pass, and a valve seat wall (22). A cylinder wall (25) having one end connected to the valve wall (26), a valve body (30) fitted to the inside of the cylinder wall (25) so as to be capable of direct movement, and a cylinder wall (25) A bottom wall (34) provided at the other end to prevent the valve body (30) from coming off, and provided between the bottom wall (34) and the valve body (30), and the valve body (30) is connected to the valve seat wall. An elastic member (33) for closing the valve hole (26) in contact with (22), and a peripheral surface discharge hole (29) formed through the cylindrical wall (25), the valve body (30) When the valve abuts against the valve seat wall (22), the space between the peripheral surface discharge hole (29) and the valve hole (26) is blocked, and the valve body (30) is separated from the valve seat wall (22). To Zhou A portion of the discharge hole (29) positioned between the valve body (30) and the valve seat wall (22) is configured to open to the valve hole (26), and the peripheral surface discharge hole (29). In the check valve (20) having a circular shape, the first peripheral surface discharge hole (29A) and the second peripheral surface discharge hole (29B) are provided on the peripheral surface at positions shifted in the axial direction and the circumferential direction of the cylindrical wall (25). Provided as a discharge hole (29) and arranged so that a part of the first peripheral surface discharge hole (29A) and a part of the second peripheral surface discharge hole (29B) overlap in the axial direction of the cylindrical wall (25). It has the characteristics in that place.

According to a second aspect of the present invention, in the check valve (20) according to the first aspect , the second peripheral surface discharge hole (29B) is separated from the valve seat wall (22) than the first peripheral surface discharge hole (29A). It is arranged at a position and is characterized by being larger than the first peripheral surface discharge hole (29A) .

A third aspect of the present invention, in the check valve of claim 2 (20), the ends of the inner valve seat wall (22) side of the second peripheral discharge hole (29B) and (P2), cylindrical wall (25 ) In the axial direction of the first peripheral surface discharge hole (29A), and is located on the valve seat wall (22) side from the center point (P1).

[Invention of Claim 1]
According to the configuration of claim 1, the differential pressure between the fluid pressure applied to the valve body (30) through the valve hole (26) and the fluid pressure applied to the valve body (30) from the opposite side to the valve hole (26) is a predetermined value. When it is smaller, the elastic force of the elastic member (33) brings the valve body (30) into contact with the valve seat wall (22) and closes the valve hole (26). On the other hand, when the differential pressure is greater than or equal to a predetermined value, the valve element (30) separates from the valve seat wall (22) against the elastic force of the elastic member (33). Then, the part located between the valve body (30) and the valve seat wall (22) in the peripheral surface discharge hole (29) is opened to the valve hole (26), and fluid flows from the valve hole (26) to the peripheral surface. It flows to the discharge hole (29) and passes through the check valve (20). Here, in the present invention, since the peripheral surface discharge hole (29) is circular, at least in the process of opening the peripheral surface discharge hole (29) from the end on the valve seat wall (22) side to the center point, The increasing rate of the opening area of the peripheral surface discharge hole (29) continuously increases as the valve body (30) moves away from the valve seat wall (22). Thereby, when the distance between a valve body (30) and a valve seat wall (22) is comparatively small, the variation | change_quantity of the opening area of the surrounding surface discharge hole (29) according to the linear motion of a valve body (30) When the distance between the valve body (30) and the valve seat wall (22) is relatively large, the peripheral surface discharge hole (30) corresponding to the direct movement of the valve body (30) can be suppressed. 29) The change amount of the opening area is increased, and a large amount of fluid can be passed. In the check valve (20) of the present invention, the peripheral surface discharge hole (29) has a circular shape. Therefore, when the cylindrical wall (25) is a resin molded product, the mold production cost is higher than before. When the cylindrical wall (25) is made of a metal processed product, the processing time is shortened. Thereby, a check valve (20) can be manufactured at lower cost than before.

In the present invention, the first and second peripheral surface discharge holes (29A, 29B) as the circular peripheral surface discharge holes (29) are arranged so as to be shifted in the axial direction and the peripheral direction of the cylindrical wall (25). At the same time, a part of the first peripheral surface discharge hole (29A) and a part of the second peripheral surface discharge hole (29B) are overlapped in the axial direction of the cylindrical wall (25). With the movement in the valve opening direction, the open area of the peripheral surface discharge hole (29) can be continuously increased. For this purpose, the number of the peripheral surface discharge holes (29) may be increased as the distance from the valve seat wall (22) increases.

[Invention of claim 2 ]
According to the second aspect, while disposed relatively small first peripheral discharge hole a (29A) to Benzakabe (22) side, a relatively large second peripheral discharge hole valve seat to (29B) Since the first peripheral surface discharge hole (29A) is opened after the first peripheral surface discharge hole (29A) is opened, the opening area of the entire peripheral surface discharge hole (29) is opened after the first peripheral surface discharge hole (29A) is opened. Increases rapidly, allowing a large amount of fluid to pass through.

[Invention of claim 3 ]
According to the configuration of the third aspect, the end (P2) on the valve seat wall (22) side of the second peripheral surface discharge hole (29B) is discharged from the first peripheral surface in the axial direction of the cylindrical wall (25). Since it is arranged on the valve seat wall (22) side from the center point (P1) of the hole (29A), from the state where only the first peripheral surface discharge hole (29A) is opened, the first peripheral surface discharge hole (29A) and the first When shifting to the state where both of the two peripheral surface discharge holes (29B) are opened, the rate of increase of the opening area of the peripheral surface discharge holes (29) accompanying the movement of the valve body (30) may be continuously increased. it can.

[First Embodiment]
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
In FIG. 1, reference numeral 10 is a part of a compressor provided in an air conditioner, for example, and has a flow path indicated by reference numeral 11. The flow path 11 communicates between a discharge chamber (not shown) of the compressor and a condenser, and has a valve mounting recess 12 having an opening on the discharge chamber side, and one end on the inner peripheral surface of the valve mounting recess 12. The communication part 13 which the part opened is provided. The open end of the valve mounting recess 12 has a stepped diameter, and a ring locking groove 15 is formed at a position offset from the step surface 14 to the open end side.

  This air conditioner uses carbon dioxide as a refrigerant in consideration of environmental performance. For this reason, the maximum temperature and the maximum pressure of the refrigerant are higher than those of a general air conditioner using Freon gas (HFC-134a) as a refrigerant. That is, in the air conditioner using chlorofluorocarbon as the refrigerant, the maximum refrigerant temperature is 150 [° C.] and the maximum refrigerant pressure is 3.5 [MPa], whereas the air conditioner of this embodiment uses carbon dioxide as the refrigerant. The maximum refrigerant temperature is 180 [° C.] and the maximum refrigerant pressure is 15 [MPa].

  The check valve 20 includes a valve body 30 and a compression coil spring 33 (corresponding to an “elastic member” according to the present invention) inside the valve main body 21. In addition, all the components of the check valve 20 except the O-ring 17 described later, that is, the valve main body 21, the valve body 30, the compression coil spring 33, and the bottom wall 34 are all made of metal in consideration of heat resistance (for example, , Made of brass, aluminum, etc.).

  The valve body 21 is integrally provided with a valve seat wall 22 and a cylindrical wall 25 according to the present invention, and the outer diameter on the cylindrical wall 25 side is smaller than the valve seat wall 22 in a stepped shape. A flange 22F projects from the end of the valve seat wall 22 on the side away from the tube wall 25 toward the side. An O-ring groove 22M is formed on the outer peripheral surface of the valve seat wall 22 adjacent to the flange 22F, and an O-ring 17 is attached thereto. The check valve 20 is inserted into the valve mounting recess 12 from the cylinder wall 25 side, and is engaged with the ring locking groove 15 of the valve mounting recess 12 in a state where the flange 22F is pressed against the step surface 14 of the valve mounting recess 12. It is fixed by the stopped E-ring 16. The space between the outer peripheral surface of the valve body 21 and the inner peripheral surface of the valve mounting recess 12 is sealed by an O-ring 17, and the cylinder between the outer peripheral surface of the cylindrical wall 25 and the inner peripheral surface of the valve mounting recess 12 Shaped gaps are formed.

  A valve hole 26 is formed through the central portion of the valve seat wall 22. Further, the inner diameter of the cylindrical wall 25 is larger than that of the valve hole 26, and the step surface between the inner surface of the valve hole 26 and the inner surface of the cylindrical wall 25 is the valve seat 22Z.

  A bottom wall fixing portion 25 </ b> S is formed at the distal end portion of the cylindrical wall 25 on the side away from the valve seat wall 22 with an inner diameter increased in a stepped shape. The bottom wall fixing portion 25S is thinner than the entire cylindrical wall 25 because the inner diameter is larger. Then, the tip of the cylindrical wall 25 is pushed inward while the disc-shaped bottom wall 34 is fitted in the bottom wall fixing portion 25S and abutted against the step surface in the bottom wall fixing portion 25S. Thus, the bottom wall 34 is fixed in the bottom wall fixing portion 25S. An emboss 34B is formed at the center of the surface of the bottom wall 34 facing the inside of the cylindrical wall 25, and a through hole is formed at the center of the emboss 34B.

  The valve body 30 has a structure in which one end portion of a cylindrical body 31 fitted in the cylindrical wall 25 so as to be linearly movable is closed by an end wall 32. The end wall 32 is disposed at the end of the cylindrical body 31 on the valve seat wall 22 side, and the end of the cylindrical body 31 opposite to the end wall 32 is open toward the bottom wall 34 side. . Further, one end of the compression coil spring 33 is accommodated in the cylindrical body 31 and comes into contact with the back surface of the end wall 32, and the other end is fitted to an emboss 34 </ b> B in the bottom wall 34. Normally, the end wall 32 is brought into close contact with the valve seat wall 22 (specifically, the valve seat 22Z) by the elastic force of the compression coil spring 33, and the valve hole 26 is closed. Here, the elastic force of the compression coil spring 33 is a predetermined pressure determined by a predetermined pressure difference between the fluid pressure applied to the valve body 30 through the valve hole 26 and the fluid pressure applied to the valve body 30 from the opposite side of the valve hole 26. When the pressure is less than the reference pressure, the end wall 32 can be held in close contact with the valve seat wall 22 as shown in FIG. As shown, the end wall 32 is set away from the valve seat wall 22.

  Now, as shown in FIGS. 2 and 4, a plurality of peripheral surface discharge holes 29 are formed in the cylindrical wall 25. The peripheral surface discharge holes 29 include a plurality of relatively small first peripheral surface discharge holes 29A and a plurality of relatively large second peripheral surface discharge holes 29B. The diameter of the first peripheral surface discharge holes 29A is the first For example, it is about 2/3 of the diameter of the two circumferential surface discharge holes 29B.

  The plurality of first circumferential surface discharge holes 29 </ b> A are scattered at, for example, four locations in the circumferential direction of the cylindrical wall 25 and are disposed at the same position in the axial direction of the cylindrical wall 25. And the edge part P3 (refer FIG. 4) by the side of the valve seat wall 22 among these 1st surrounding surface discharge holes 29A is arrange | positioned in the position which contact | connects the valve seat 22Z.

  On the other hand, the plurality of second peripheral surface discharge holes 29 </ b> B are disposed at two locations in the circumferential direction of the cylindrical wall 25 and are disposed at the same position in the axial direction of the cylindrical wall 25. An end portion P2 (see FIG. 4) on the valve seat wall 22 side of the second peripheral surface discharge hole 29B is a center point P1 (see FIG. 4) of the first peripheral surface discharge hole 29A in the axial direction of the cylindrical wall 25. Further, it is slightly arranged on the valve seat wall 22 side.

  This completes the description of the configuration of the present embodiment. Next, the effect of this embodiment is demonstrated. In the check valve 20 of the present embodiment, when the differential pressure between the discharge chamber of the compressor (not shown) and the condenser is smaller than a predetermined value, the valve body 30 contacts the valve seat wall 22 by the elastic force of the compression coil spring 33. The valve hole 26 is closed in contact.

  Further, when the differential pressure between the discharge chamber of the compressor and the condenser becomes equal to or higher than the reference pressure, the valve body 30 moves away from the valve seat wall 22 against the elastic force of the compression coil spring 33. Then, a portion of the peripheral surface discharge hole 29 located between the valve body 30 and the valve seat wall 22 is opened to the valve hole 26, and fluid flows from the valve hole 26 to the peripheral surface discharge hole 29 to check the check valve 20. Pass through.

  Here, in the check valve 20 of the present embodiment, since the peripheral surface discharge hole 29 is circular, at least in the process of opening the peripheral surface discharge hole 29 from the end on the valve seat wall 22 side to the center point, The increasing rate of the opening area of the peripheral surface discharge hole 29 continuously increases as the valve body 30 moves away from the valve seat wall 22. As a result, when the distance between the valve body 30 and the valve seat wall 22 is relatively small, the amount of change in the opening area of the peripheral surface discharge hole 29 corresponding to the direct movement of the valve body 30 becomes small, thereby suppressing hunting. When the distance between the valve body 30 and the valve seat wall 22 is relatively large, the amount of change in the opening area of the peripheral surface discharge hole 29 corresponding to the direct movement of the valve body 30 becomes large, and a large amount of fluid is drawn. Can be passed.

  More specifically, in the check valve 20 of the present embodiment, the peripheral surface discharge hole 29 is constituted by the first and second peripheral surface discharge holes 29A and 29B, and the relatively small first peripheral surface discharge hole 29A is provided as a valve. The second peripheral surface discharge hole 29B is disposed on the side of the seat wall 22, while the relatively large second peripheral surface discharge hole 29B is disposed away from the valve seat wall 22, so that the second peripheral surface discharge hole 29B is opened after the first peripheral surface discharge hole 29A is opened. After the opening is started, the opening area of the entire peripheral surface discharge hole 29 is rapidly increased, and a large amount of fluid can be passed.

  Moreover, the end portion P2 on the valve seat wall 22 side of the second peripheral surface discharge hole 29B is disposed on the valve seat wall 22 side in the axial direction of the cylindrical wall 25 from the center point P2 of the first peripheral surface discharge hole 29A. Therefore, when shifting from the state where only the first peripheral surface discharge hole 29A is opened to the state where both the first peripheral surface discharge hole 29A and the second peripheral surface discharge hole 29B are open (state of FIG. 3), the valve The increase rate of the opening area of the peripheral surface discharge hole 29 accompanying the movement of the body 30 can be continuously increased.

  Further, the check valve 20 of this embodiment is made of resin since all the components except the O-ring 17, that is, the valve body 21, the valve body 30, the bottom wall 34 and the compression coil spring 33 are made of metal. Compared to the case where it is configured, it has excellent heat resistance, and can be used in a flow path of an air conditioner using carbon dioxide as a refrigerant. In the check valve 20 of the present embodiment, since the peripheral surface discharge hole 29 is circular, the peripheral surface discharge hole 29 can be easily processed in the metal cylinder wall 25. That is, the peripheral surface discharge hole 29 can be formed simply by selecting a drill that matches the diameter of the peripheral surface discharge hole 29 and abutting it against the cylindrical wall 25. Thereby, compared with the case where a surrounding surface discharge hole is non-circular, processing time becomes short and the manufacturing cost of the check valve 20 can be made lower than before.

[Second Embodiment]
In the present embodiment, as shown in FIG. 5, the valve seat wall 22 and the cylindrical wall 25 of the valve main body 21 are separate parts, and the cylindrical wall 25 and the bottom wall 34 are an integrally molded product of resin. This is different from the first embodiment. Only the configuration different from that of the first embodiment will be described below.

  In the present embodiment, the cylindrical wall 25 and the bottom wall 34 are, for example, an integrally molded product of nylon 66. And the cylindrical wall fitting part 22W with which the one end part of the valve seat wall 22 was equipped inside the opening end on the opposite side to the bottom wall 34 among the cylindrical walls 25 is fitted. The cylindrical wall fitting portion 22W has a stepped diameter smaller than that of the ring mounting portion 22V on which the O-ring 17 is mounted in the valve seat wall 22, and the cylindrical wall 25 is connected to the ring mounting portion 22V and the cylindrical wall. It is abutted against the step surface between the fitting portion 22W and positioned in the axial direction. A projection 22T is formed on the outer peripheral surface of the cylinder wall fitting portion 22W, and the cylinder wall 25 is fixed to the valve seat wall 22 by biting the projection 22T into the cylinder wall 25. Further, a flange 25F projects from the outer peripheral surface of the opening end of the cylindrical wall 25, and an O-ring groove 22M is formed between the flange 25F of the cylindrical wall 25 and the flange 22F of the valve seat wall 22, and an O-ring is formed here. 17 is mounted.

  The configuration of the present embodiment is as described above. In the check valve 20 of the present embodiment, since the peripheral surface discharge hole 29 provided in the cylindrical wall 25 is circular as in the first embodiment, a gold for molding the cylindrical wall 25 that is a resin molded product is used. Mold production costs are lower than before. Thereby, the check valve 20 can be manufactured at a lower cost than before.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.

  (1) The peripheral surface discharge hole 29 of the above embodiment is configured by the first and second peripheral surface discharge holes 29A and 29B having different diameters. However, as shown in FIG. The diameters of the peripheral surface discharge holes 29 may all be the same.

(2) Further, as shown in FIG. 6, the number of the peripheral surface discharge holes 29 is increased as the distance from the valve seat wall 22 increases, and the peripheral surface discharge holes 29 are opened as the valve body 30 moves away from the valve seat wall 22. You may comprise so that the increase rate of an area may increase continuously.

1 is a side sectional view of a check valve according to a first embodiment of the present invention. Check valve side view Side view of check valve Side view of check valve Side sectional view of the check valve of the second embodiment Side cross-sectional view of the check valve modification Side view of a conventional check valve

Explanation of symbols

20 Check valve 21 Valve body 22 Valve seat wall 22T Protrusion 22V Ring mounting part 22W Cylinder wall fitting part 22Z Valve seat 25 Cylinder wall 26 Valve hole 29 Circumferential discharge hole 29A First peripheral discharge hole 29B Second peripheral discharge hole 30 Valve body 33 Compression coil spring (elastic member)
34 Bottom wall

Claims (3)

A valve seat wall (22) having a valve hole (26) through which fluid can pass;
A cylindrical wall (25) having one end connected to the valve seat wall (22) and surrounding the valve hole (26);
A valve body (30) fitted in the cylinder wall (25) so as to be directly movable;
A bottom wall (34) provided at the other end of the cylindrical wall (25) and preventing the valve body (30) from coming off;
Elasticity provided between the bottom wall (34) and the valve body (30) for closing the valve hole (26) by bringing the valve body (30) into contact with the valve seat wall (22). A member (33);
A peripheral surface discharge hole (29) formed through the cylindrical wall (25);
When the valve body (30) contacts the valve seat wall (22), the gap between the peripheral surface discharge hole (29) and the valve hole (26) is blocked, and the valve body (30) When the valve seat wall (22) is separated from the valve seat wall (22), a portion of the peripheral surface discharge hole (29) positioned between the valve body (30) and the valve seat wall (22) is the valve hole (26). In the check valve (20) that is configured to be open with respect to the peripheral surface discharge hole (29),
The first peripheral surface discharge hole (29A) and the second peripheral surface discharge hole (29B) are provided as the peripheral surface discharge hole (29) at positions shifted in the axial direction and the circumferential direction of the cylindrical wall (25), In the axial direction of the cylindrical wall (25), a part of the first peripheral surface discharge hole (29A) and a part of the second peripheral surface discharge hole (29B) are arranged so as to overlap each other. Check valve (20).   The second peripheral surface discharge hole (29B) is disposed at a position farther from the valve seat wall (22) than the first peripheral surface discharge hole (29A) and is larger than the first peripheral surface discharge hole (29A). The check valve (20) according to claim 1, characterized in that:   The end (P2) on the valve seat wall (22) side of the second peripheral surface discharge hole (29B) is connected to the first peripheral surface discharge hole (29A) in the axial direction of the cylindrical wall (25). The check valve (20) according to claim 2, wherein the check valve (20) is arranged closer to the valve seat wall (22) than a center point (P1).

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