JP5261084B2 - Check valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a check valve having a strength capable of withstanding a high pressure environment while having the same plate thickness as that of a conventional check valve and a simple structure as before. <P>SOLUTION: The check valve includes: a valve seat having a groove in the outer circumference as well as a valve seat section; a circular valve element made of a thin plate; and a valve holder having multiple legs disposed in an approximate circle and multiple valve stoppers fastened to the legs. The multiple legs are coupled with the adjacent legs, and the valve stoppers are made of a longitudinal member extended in the approximately central direction of the cross section of the valve holder. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a check valve used for flow path formation and backflow prevention at the time of cycle switching of a heat pump air conditioner, for prevention of high pressure gas backflow when a compressor is stopped, and the like.

This type of check valve uses a metal ball as a valve body or a metal material manufactured by cutting or the like.
In such a check valve, since the valve body is made of metal, the weight of the valve body is increased, and there is a disadvantage that pressure loss is increased. On the other hand, attempts have been made to reduce the weight of the valve body as a synthetic resin such as Teflon (registered trademark). Therefore, there is a disadvantage that the entire apparatus becomes large. Further, in the conventional check valve, there is a drawback in that when a part constituting the valve is incorporated into various devices, a valve seat that is particularly precisely finished is damaged during transportation or incorporation.

  In order to solve such a problem of the check valve, the present applicant discloses a check valve including a valve body formed by punching a metal thin plate into a circle. Further, Patent Document 2 discloses a structure of a sheet metal valve claw that is strengthened by providing a reinforcing structure for use in a high-pressure environment.

  FIG. 7 is a perspective view showing an exploded state of the check valve of Patent Document 1. FIG. The check valve includes a valve holder 100, a circular valve body 200 made of a thin metal plate, and a metal valve seat 300 having a groove 304 on the outer periphery and a valve seat portion 302. Further, the valve holder 100 includes a circular upper surface 108, a plurality of legs 102 arranged at equal intervals on the outer periphery of the upper surface 108 and extending at right angles, and arranged at equal intervals on the inner periphery of the upper surface 108 and extending at right angles. And a plurality of claws 106 to be provided. Further, a protrusion 104 that engages with the groove 304 of the valve seat 300 is provided near the tip of the leg 102.

  FIG. 8 is a cross-sectional view showing an assembled state of the check valve of Patent Document 1. The check valve of Patent Document 1 is assembled by inserting the valve body 200 and the valve seat 300 into the valve holder 100 from the distal end direction of the leg 102 and engaging the protrusion 104 with the groove 304. Further, the assembled check valve is inserted into the pipeline and fixed in the pipeline by caulking or the like from the outside of the pipeline.

In the solid line state in the figure, it is in the closed position, and the flow from the arrow A in the figure is stopped. On the other hand, with respect to the flow in the direction of arrow B in the figure, the valve element 200 is lifted until it comes into contact with the claw 106 as shown by the chain line in the figure as the maximum open state. At this time, the claw 106 functions as a valve stopper that restricts the movement of the valve body 200. In this state, as indicated by a chain line arrow in the figure, the claw 106 is circulated through the gap from the inside and outside of the claw 106 and is in a valve open state.
Japanese Patent Laid-Open No. 3-66987 JP 2006-125490 A

  By the way, natural refrigerants have been developed and spread as a countermeasure against global warming instead of chlorofluorocarbon refrigerants which have been mainstream so far, and carbon dioxide refrigerants that are particularly ignitable and less toxic are attracting attention.

  The carbon dioxide refrigerant requires a high-pressure refrigeration cycle due to the characteristics of the refrigerant. For example, the highest use pressure of R410A, which is known as a high pressure among CFC-based refrigerants, is 4.7 MPa, whereas the maximum use pressure of R744, which is a carbon dioxide refrigerant, is about 15 to 13 times, 14 to 15 MPa. .

  Under a high pressure environment in which a carbon dioxide refrigerant is used, in the conventional valve holder 100 disclosed in Patent Document 1, stress concentrates on the upper surface 108 to which force is transmitted from the claw 106 in the valve open state, and the strength of the upper surface 108 is increased. Deformation and bending failure occur due to lack of. Similarly, even the conventional sheet metal valve pawl disclosed in Patent Document 2 has insufficient strength because the area of the portion that finally receives the force is small.

  Increasing the number of legs 102 of the valve holder 100 has some effect on reducing the stress concentrated on the upper surface 108, but it is not preferable because the cross sectional area of the fluid decreases and the pressure loss increases. Although it is conceivable to increase the plate thickness of the valve holder in order to improve the strength of the valve holder 100, it is not preferable because processing during manufacture is difficult and the cross-sectional area through which the fluid passes is reduced.

  The present invention has been made in view of the above problems, and provides a check valve having a strength that can withstand a high-pressure environment with a plate thickness equivalent to that of a conventional check valve, and having a simple structure as before. The purpose is to do.

The present invention was invented in order to achieve the problems and objects in the prior art as described above,
The check valve of the present invention is
A valve seat having a groove on the outer periphery and having a valve seat,
A circular valve body made of a thin plate;
A plurality of legs which extend at a right angle from the upper surface while being spaced apart so as to be substantially circumferentially circular top surface, and a plurality of valves stoppers fixed to the leg, and a valve holder having a ,
With
The plurality of valve stoppers are made of a longitudinal beam member that is fixed to a side surface of the leg in the circumferential direction and extends in a substantially central direction of the cross section of the valve holder.
The check valve of the present invention
A valve seat having a groove on the outer periphery and having a valve seat,
A circular valve body made of a thin plate;
A valve holder having a plurality of legs arranged substantially circumferentially and a plurality of valve stoppers connecting between the legs arranged substantially circumferentially and the legs;
With
The plurality of valve stoppers are fixed to a side surface on one side in the circumferential direction of the leg and a side surface on the other side of the leg adjacent thereto, respectively, and protrude in a substantially central direction of the cross section of the valve holder. It consists of the longitudinal beam member extended, It is characterized by the above-mentioned.
By configuring the present invention in this way, the check valve can have a strength that can withstand a high pressure environment with a plate thickness equivalent to that of a conventional check valve, and has a simple structure as before.

  The check valve of the present invention
  The plurality of valve stoppers are fixed to one side and the other side in the circumferential direction of the legs,
  In the adjacent legs and legs,
  The valve stopper fixed to the side surface on one side of the leg and the valve stopper fixed to the other side surface of the leg adjacent thereto are on the substantially central side of the cross section of the extended valve holder. The ends are connected to each other.
  By configuring the present invention in this way, it is possible to obtain a check valve with higher strength while maintaining a simple structure as before.

  The check valve of the present invention
  One of the plurality of valve stoppers is characterized in that a longitudinal beam member constituting the valve stopper is divided.
  By constructing the present invention in this way, a check valve with higher strength can be easily manufactured with a simple structure as in the prior art.

  The check valve of the present invention
  End portions of the valve stopper and the valve stopper are connected in a curved shape.
  Furthermore, the check valve of the present invention is
The plurality of valve stoppers are made of a longitudinal beam member that is curved and extends in a direction substantially in the center of the cross section of the valve holder.
  By configuring the present invention in this manner, a check valve with higher strength can be easily manufactured.

The check valve of the present invention
The leg is provided with a protrusion that engages with the groove of the valve seat .
By configuring the present invention in this way, it is possible to obtain a higher-strength check valve, and it is easy to assemble the check valve and handle it after the check valve is assembled.

The check valve of the present invention
The leg is characterized in that a convex portion is formed in the substantially center direction of the cross section of the valve holder .

  By configuring the present invention in this way, even when the check valve is in the open state, the valve body can be stably held at the approximate center position of the cross section of the valve holder, and the pressure loss can be reduced. it can.

  According to the check valve of the present invention, it has a strength that can withstand a high-pressure environment while maintaining the same plate thickness as the conventional one, and can have a simple structure as before. In addition, check valve assembly work and handling work after check valve assembly are easy, and even when the check valve is open, the valve element is stably held at the approximate center position of the cross section of the valve holder. can do.

  Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings. In addition, since the valve body and valve seat of the check valve of the present invention have the same structure and shape as the valve body 200 and the valve seat 300 of the prior art, the description thereof will be omitted.

FIG. 1 is a perspective view showing a valve holder according to a check valve of a first embodiment of the present invention. FIG. 2 is a plan view of the valve holder of FIG.
1 and 2, the valve holder 10 has a plate thickness equivalent to that of the conventional valve holder 100, is arranged on the outer circumference of the circular upper surface 18 at equal intervals, and extends perpendicularly from the upper surface 18. A plurality of legs 12 to be provided and a plurality of valve stoppers 16 fixed to the circumferential side surfaces of the legs 12 are provided. That is, the leg 12 is connected to the adjacent leg 12 by the upper surface 18.

Further, a protrusion 14 that engages with a groove of a valve seat (not shown) is provided at the tip of the leg 12.
The valve stopper 16 is composed of a longitudinal beam member extending in a substantially central direction of the cross section of the circular upper surface 18. In the present specification, the vertical beam member means a beam member in which the long side of the flat plate member is arranged vertically with respect to the direction of the force.

  7 and 8 in the prior art, a valve body and a valve seat (not shown) are inserted into the valve holder 10 from the distal end direction of the leg 12, and the protrusion 14 is engaged with the groove of the valve body. Thus, the check valve of the first embodiment is assembled. Further, the assembled check valve is inserted into the pipeline and fixed in the pipeline by caulking or the like from the outside of the pipeline.

  In the check valve of the first embodiment assembled as described above, force is transmitted from the valve body to the valve stopper 16 when the valve body comes into contact with the valve stopper 16 in the opened state. The valve stopper 16 is composed of a longitudinal beam member, and has a high strength against the force from the longitudinal direction. Therefore, the force transmitted from the valve body is transmitted to the leg 12 without causing excessive deformation or destruction. To do.

The force transmitted to the legs 12 is also distributed and transmitted to the upper surface 18 that connects the legs 12 to each other. Further, it is also distributed and transmitted to the valve seat via the protruding portion 14 provided at the tip of the leg 12.

  As described above, the valve holder 10 according to the first embodiment transmits the force transmitted from the valve body in a distributed manner from the leg 12 to the upper surface 18 and the valve seat via the valve stopper 16. Compared to the holder 100, the area of the portion that finally receives the force can be secured widely. Therefore, the valve holder 10 of the first embodiment has a high strength that can withstand even in a high-pressure environment without stress concentration on a specific part as compared with the conventional valve holder 100.

  The valve holder 10 in FIGS. 1 and 2 includes six legs 12. However, in order to stably insert the valve holder 10 into the valve seat, the number of legs may be three or more. That's fine. Further, in order to receive the force from the valve body equally, the legs 12 are preferably arranged on the outer periphery of the upper surface 18 at equal intervals. Further, the valve stopper 16 of FIG. 1 is fixed only to the leg 12 and is not directly fixed to the upper surface 18, but may be directly fixed to the upper surface 18.

  The valve stopper 16 of FIGS. 1 and 2 has a cantilever structure in which one end portion of the vertical beam member is fixed to the leg 12, but both end portions of the vertical beam member are adjacent to each other as shown in FIG. Alternatively, a fixed beam structure fixed to each leg 12 may be used.

FIG. 4 is a perspective view showing a valve holder according to the check valve of the second embodiment of the present invention. FIG. 5 is a plan view of the valve holder of FIG.
4 and 5, the valve holder 20 has a plate thickness equivalent to that of the conventional valve holder 100, a plurality of legs 22 that are circumferentially arranged at equal intervals, and a circumferential side surface of the legs 22. And a plurality of valve stoppers 26 to be fixed.

In addition, the leg 22 is provided with a protrusion 24 that engages with the groove of the valve seat at the tip, and a protrusion 25 is formed in the substantially center direction of the cross section of the valve holder.
The valve stopper 26 is composed of a longitudinal beam member that is curved and extends in a substantially center direction of the cross section of the valve holder 20. The curved longitudinal beam members constituting the valve stopper 26 are fixed to the respective legs 22 whose both ends are adjacent to each other. That is, the leg 22 is connected to the adjacent leg 22 by the longitudinal beam member. Further, the valve stopper 26 constitutes an outer peripheral wall of the valve holder 20 together with the leg 22.

  Note that the vertical beam member is curved and extended in the direction of the center of the cross section because it is easier to process and manufacture than the case of extending the rectangular shape, and stress is concentrated at the bent portion when the rectangular shape is formed. This is because the strength of the longitudinal beam member decreases.

  FIG. 10 is a cross-sectional view showing a state in which the check valve of the second embodiment is fixed in the pipeline. FIG. 10A shows a state where the check valve is closed, and FIG. 10B shows a state where the check valve is opened.

  Assembling of the check valve 30 of the second embodiment is performed by inserting the valve body 32 and the valve seat 34 into the valve holder 20 from the distal end direction of the leg 22, as in FIGS. The protrusion 24 is assembled by engaging with the groove 38 of the valve body 32. Further, the assembled check valve 30 is inserted into the pipe line 40 and fixed in the pipe line 40 by applying a caulking process 42 or the like from the outside of the pipe line.

The check valve 30 of the second embodiment assembled as described above is configured such that the valve body 32 abuts on the valve stopper 26 in the valve open state shown in FIG. The force is distributed and transmitted to the entire outer peripheral wall of the valve holder 20 formed integrally. The valve stopper 26 is composed of a curved longitudinal beam member, and has high strength in itself.
Since it is integrated with the leg 22, even if force is transmitted from the valve body 32, excessive deformation and destruction do not occur. Further, the force transmitted to the valve stopper 26 is also distributed and transmitted to the valve seat 34 via the protrusion 24 provided at the tip of the leg 22.

  As described above, in the valve holder 20 of the second embodiment, the force transmitted from the valve body 32 is distributed over the entire outer peripheral wall of the valve holder 20 formed by integrating the valve stopper 26 and the leg 22. Since it is transmitted, it is possible to secure a wide area of the portion that finally receives force. Therefore, compared with the conventional valve holder 100, the valve holder 20 does not concentrate stress on a specific part, and has a high strength that can withstand even in a high-pressure environment.

  The valve holder 20 shown in FIGS. 4 and 5 includes five legs 22. However, in order to stably attach the valve holder 20 to the valve seat, the number of legs may be three or more. That's fine. Moreover, in order to receive the force from a valve body equally, it is preferable that the leg 22 is arrange | positioned at equal intervals in the circumferential shape.

  Further, in the valve holder 20 of FIGS. 4 and 5, the longitudinal beam member of the valve stopper 26 on the lower side in the drawing is divided at an intermediate position. This is because the valve holder 20 is manufactured by punching a thin plate made of stainless steel or the like and then bending it, so that in one of the valve stoppers, it is easier to manufacture if the longitudinal beam member constituting the valve stopper is divided. However, the divided valve stopper 26 may be joined by welding at the welding position 27 after bending as shown in FIG.

  Moreover, it is preferable that the convex part 25 is formed in the cross-sectional approximate center direction of the leg 22. By doing so, even when the check valve is in the open state, the valve body can be stably held at the substantially center position of the cross section of the valve holder 20, and the pressure loss can be reduced.

As a material for the valve holder of the check valve according to the present invention, copper alloy, stainless steel, or the like can be preferably used, but is not particularly limited.
As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to the said embodiment. Various modifications can be made without departing from the object of the present invention.

  Below, the stress analysis result concerning the valve holder of the non-return valve of this invention by a finite element method is demonstrated compared with a comparative example. In the following description, the check valve including the valve holder 10 illustrated in FIG. 1 is referred to as Example 1, and the check valve including the valve holder 20 illustrated in FIG.

Further, as a comparative example, a check valve provided with a valve holder 100a shown in FIG. 9 is assumed to have a strength equivalent to that of the conventional valve holder 100.
The valve holder 100a is arranged in the middle of a cross-shaped upper surface 108a having an opening in the center, four legs 102a arranged at the tip of the cross-shaped upper surface 108a and extending at right angles, and the cross-shaped upper surface 108a. And a plurality of claws 106a extending at right angles. Furthermore, the protrusion part 104a is provided in the front-end | tip of the leg 102a.

  7 and 8 in the prior art, a valve body and a valve seat (not shown) are inserted into the valve holder 100a from the distal end direction of the leg 102a, and the protrusion 104a is engaged with the groove of the valve body. By doing so, the check valve of the comparative example is assembled.

In addition, these Examples and Comparative Examples are for describing the present invention more specifically, and the present invention is not limited only to the scope of the Examples.
(material)
The material of the valve holder is made of stainless steel (SUS430) in both Example 1, Example 2, and Comparative Example. The allowable tensile stress of SUS430 is 105 N / mm ² .
(Thickness)
The plate thickness of the valve holder is 0.3 mm in each of Example 1, Example 2, and Comparative Example.
(Shape / Dimensions)
The length of the longitudinal beam member constituting the valve stopper 16 of the first embodiment is 1.5 mm and the height is 2.0 mm.

The length of the longitudinal beam member constituting the valve stopper 26 of Example 2 is 1.4 mm, the height is 2.0 mm, and the curvature radius of the curved portion is 0.25 mm.
The claw 106a of the comparative example has a width of 1.8 mm and a height of 1.7 mm.
(Analysis result)
After assembling the check valves of Example 1, Example 2, and Comparative Example, the pressure of 15 MPa was applied to the valve body in the direction of arrow B in FIG. [Table 1] shows the maximum tensile stress generated in the valve holder and the safety factor obtained by dividing the above allowable tensile stress by the maximum tensile stress.

  In contrast to the safety factor of 0.47 in the comparative example, the safety factor in Example 1 was 1.05, which is twice or more, and that in Example 2 was 2.95, which was six times or more.

  From the above Examples and Comparative Examples, it was confirmed that the check valve of the present invention has a high strength that can withstand a high-pressure environment with a plate thickness equivalent to that of the check valve of the Comparative Example.

FIG. 1 is a perspective view showing a valve holder according to a check valve of a first embodiment of the present invention. FIG. 2 is a plan view of the valve holder of FIG. FIG. 3 is a plan view showing a valve holder according to the check valve of the first embodiment in which both ends of the longitudinal beam member are fixed to the legs adjacent to each other. FIG. 4 is a perspective view showing a valve holder according to the check valve of the second embodiment of the present invention. FIG. 5 is a plan view of the valve holder of FIG. FIG. 6 is a plan view showing a valve holder according to the check valve of the second embodiment in which none of the longitudinal beam members constituting the valve stopper is divided. FIG. 7 is a perspective view showing an exploded state of the check valve of Patent Document 1. FIG. FIG. 8 is a cross-sectional view showing an assembled state of the check valve of Patent Document 1. FIG. 9 is a perspective view showing a valve holder according to a conventional check valve. FIG. 10 is a cross-sectional view showing a state in which the check valve of the second embodiment is fixed in the pipeline.

Explanation of symbols

10 Valve holder 12 of the first embodiment Leg 14 Protruding portion 16 Valve stopper 18 Upper surface 20 Valve holder 22 of the second embodiment Leg 24 Protruding portion 25 Protruding portion 26 Valve stopper 27 Welding position 30 Reverse of the second embodiment Stop valve 32 Valve body 34 Valve seat 36 Valve seat portion 38 Groove 40 Pipe line 42 Caulking process 100 Valve holder 100a described in Patent Document 1 Conventional valve holder 102 Leg 102a Leg 104 Protruding portion 104a Protruding portion 106 Claw 106a Claw 108 Upper surface 108a Upper surface 200 Valve body 300 Valve seat 302 Valve seat portion 304 Groove

Claims (8)

A valve seat having a groove on the outer periphery and having a valve seat,
A circular valve body made of a thin plate;
A plurality of legs which extend at a right angle from the upper surface while being spaced apart so as to be substantially circumferentially circular top surface, and a plurality of valves stoppers fixed to the leg, and a valve holder having a ,
With
The plurality of valve stoppers are made of a longitudinal beam member that is fixed to a side surface of the leg in the circumferential direction and extends in a substantially central direction of the cross section of the valve holder.   The plurality of valve stoppers are fixed to one side and the other side in the circumferential direction of the legs,
  In the adjacent legs and legs,
  The valve stopper fixed to the side surface on one side of the leg and the valve stopper fixed to the other side surface of the leg adjacent thereto are on the substantially central side of the cross section of the extended valve holder. The check valve according to claim 1, wherein the ends are connected to each other.   The check valve according to claim 2, wherein ends of the valve stopper and the valve stopper are connected in a curved shape.   A valve seat having a groove on the outer periphery and having a valve seat,
  A circular valve body made of a thin plate;
  A valve holder having a plurality of legs arranged substantially circumferentially and a plurality of valve stoppers connecting between the legs arranged substantially circumferentially and the legs;
  With
  The plurality of valve stoppers are fixed to a side surface on one side in the circumferential direction of the leg and a side surface on the other side of the leg adjacent thereto, respectively, and protrude in a substantially central direction of the cross section of the valve holder. A check valve comprising a longitudinal beam member. 5. The check valve according to claim 4, wherein the plurality of valve stoppers are longitudinal beam members that are curved and extend in a direction substantially in the center of the valve holder. The check valve according to claim 4 or 5, wherein in one of the plurality of valve stoppers, a longitudinal beam member constituting the valve stopper is divided . The check valve according to claim 1 , wherein the leg is provided with a protrusion that engages with a groove of the valve seat . The check valve according to any one of claims 1 to 7 , wherein a convex portion is formed on the leg in a substantially center direction of a cross section of the valve holder.

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