JP3225466U - Lead type check valve - Google Patents

Abstract

An object of the present invention is to provide a reed-type check valve capable of preventing air leakage from an O-ring mounting portion. A reed-type valve body (35) is provided on an upper end (3a) of a valve body (3) where a fluid inlet (19) and a fluid outlet (23) are provided. An annular dovetail groove 25 is provided on the outer peripheral edge of the fluid inlet 19. The annular dovetail groove 25 has a substantially trapezoidal cross-sectional shape, and the width of the opening is narrower than the width of the bottom, thereby preventing protrusion. An O-ring 27 is provided inside the annular dovetail groove 25. A spring pin 28 as an O-ring deformation preventing member is provided in the machining hole 26 on the fluid outlet 23 side of the annular dovetail groove 25. The spring pin 28 is a cylindrical C-ring having a cut-out part in the circumferential direction. [Selection] Figure 2

Description

  The present invention relates to, for example, a reed check valve used to prevent backflow of air to an air compressor when air is sent from an air compressor to an air accumulator. It is related to a device devised so as to prevent the problem.

  Patent Document 1 discloses, for example, a structure of a check valve used between an air compressor and an air accumulator. There, a so-called "lift check valve" is disclosed. FIG. 13 shows the configuration. First, there is a valve box 101, in which a fluid inflow port 103 and a fluid outflow port 105 are formed. Further, a fluid flow passage 107 is formed in the valve box 101 to communicate the fluid inflow port 103 and the fluid outflow port 105. The fluid flow path 107 is formed between the fluid inflow path 109 on the fluid inflow port 103 side, the fluid outflow path 111 on the fluid outflow port 105 side, and the fluid inflow path 109 and the fluid outflow path 111. And a valve chamber 113 formed.

  A valve seat portion 115 is formed on the fluid inflow passage 109 side of the valve chamber 113, and a lift type valve body 117 is accommodated in the valve chamber 113 so as to be vertically movable in FIG.

  According to the above configuration, when the fluid is going to flow from the fluid inflow port 103 side to the fluid outflow port 105 side, the valve seat portion 115 is opened by the lift-type valve element 117 being pushed up by the pressure of the fluid, whereby the valve seat portion 115 is opened. The fluid is allowed to flow from the fluid inflow port 103 side to the fluid outflow port 105 side. On the other hand, when the fluid tries to flow backward from the fluid outflow port 105 side to the fluid inflow port 103 side, the lift type valve body 117 is pushed down and the valve seat portion 115 is closed, whereby the fluid outflow port 105 side Backflow of the fluid from the fluid inflow port 103 side is prevented.

  Patent Document 2 discloses, for example, a structure of a lift check valve of the same type.

However, such a lift check valve has a structure in which the lift type valve body 117 moves up and down. Therefore, when the lift type check valve is operated for a long time, it is worn due to abrasion due to friction between the sliding portion of the valve box 101 and the lift type valve body 117. Powder was generated and caused a malfunction.
When the valve box 101 and the lift type valve element 117 are made of brass, patina occurs due to aging. The patina caused malfunctions and patina promoted the generation of wear powder due to the abrasion described above.
Therefore, a reed-type check valve as described in Patent Document 3 has been proposed.
Patent Document 3 is filed by the applicant for the present utility model registration.

  The reed check valve includes a valve box, which is composed of a valve box body and a lid. A valve chamber opened to the valve box body side is formed in the lid. The valve box main body is provided with a fluid inflow port connected to the valve chamber via a fluid inlet, and a fluid outflow port connected to the valve chamber via a fluid outlet. A reed-type valve body is provided in the valve chamber. One end of the lead type valve body is fixed to the valve body. A through hole is formed on the fluid outlet side of the reed type valve body. Further, a valve receiver is provided above the reed-type valve so as not to apply an excessive stress to the reed-type valve. An annular dovetail groove is formed on the outer peripheral side of the fluid inlet of the valve body, and an O-ring is provided in the annular dovetail groove. A processing hole required for processing the annular dovetail groove is formed on the fluid outlet side of the annular dovetail groove.

  In the processing of the annular dovetail groove, as shown in FIG. 14A, a processing hole 205 is formed in the valve box body 203 by the O-ring dovetail cutter 201. Next, as shown in FIG. 13B, the O-ring dovetail cutter 201 is moved laterally to a predetermined position. Thereafter, by moving the O-ring dovetail groove cutter 201 along a predetermined circular orbit in this state, an annular dovetail groove 207 is formed as shown in FIG. As a result, the annular dovetail groove 207 is formed, and the machining hole 205 remains on the fluid outlet side.

  When the fluid flows in from the fluid inflow port, the fluid enters the valve chamber from the fluid inflow port, and then passes through the through hole of the reed-type valve body and the fluid outflow port to form the fluid outflow port. Get out from the side. When the fluid flows in from the fluid outlet port, the fluid enters the valve chamber through the fluid outlet and the through hole of the reed valve, but the reed valve is moved by the fluid into the fluid inlet. As a result, the reed-type valve element closes the fluid inlet and prevents the fluid from flowing back.

Japanese Utility Model Publication No. 58-22568 JP-A-10-38108 Utility Model Registration No. 3146855

  According to the above-mentioned conventional configuration, there are the following problems. That is, in the lead type check valve having such a configuration, since the valve element does not move up and down, there is no problem caused by friction or wear. Since the necessary processing hole 205 remains as it is, when the reed valve element is opened and the fluid velocity is high, the O-ring is deformed and swelled toward the processing hole 205 by the flow on the fluid inlet side, As a result, there is a problem that the sealing function is impaired due to the protrusion of the O-ring.

  The present invention has been made based on such a point, and an object of the present invention is to provide a lead type check valve which can prevent air leakage from an O-ring mounting portion.

In order to achieve the above object, a reed check valve according to claim 1 of the present invention includes a valve portion provided in the middle of a fluid flow passage, a reed type valve body installed to close the valve portion, An annular groove provided in the valve portion, an O-ring mounted on the annular groove, and an O-ring deformation preventing member for preventing deformation of the O-ring are provided.
According to a second aspect of the present invention, in the reed check valve according to the first aspect, the annular groove is an annular dovetail, and the O-ring deformation preventing member is provided in the annular dovetail. The elastic member is provided on the outer periphery of the ring.
According to a third aspect of the present invention, there is provided the reed check valve according to the second aspect, wherein the elastic member is a leaf spring.
According to a fourth aspect of the present invention, there is provided the reed check valve according to the third aspect, wherein the leaf spring corresponds to a lower peripheral portion of a virtual cone including an outer inner peripheral surface of the annular dovetail groove. It is characterized by being.
According to a fifth aspect of the present invention, in the lead type check valve according to the second aspect, the O-ring deformation preventing member is provided in a machining hole provided adjacent to the annular dovetail groove. Characterized in that it is an elastic member.
According to a sixth aspect of the present invention, there is provided a reed check valve according to the fifth aspect, wherein the elastic member is a cylindrical C-ring.
According to a seventh aspect of the present invention, there is provided the reed check valve according to the first aspect, wherein the annular groove has a U-shaped cross section, and an O-ring deformation preventing member is provided in the annular groove. Wherein the inner peripheral surface of the bush is in the shape of a truncated cone, forming an annular dovetail inside, and the O-ring is provided in the annular dovetail. Things.
The lead type check valve according to claim 8 is the lead type check valve according to any one of claims 1 to 7, wherein the valve box, a fluid inlet port provided in the valve box, A fluid outflow port provided in the valve box, wherein the fluid flow passage is provided so as to communicate the fluid inflow port and the fluid outflow port, and the reed-type valve element is disposed on the fluid inflow port side. From the fluid outflow port to the fluid outflow port side and restricts backflow.

As described above, according to the reed check valve according to the first aspect of the present invention, a valve portion provided in the middle of the fluid flow passage, a reed-type valve body installed to close the valve portion, Since it has an annular groove provided in the valve portion, an O-ring mounted in the annular groove, and an O-ring deformation preventing member for preventing deformation of the O-ring, air from the O-ring mounting portion is provided. Leakage can be prevented.
According to the lead type check valve according to the second aspect, in the lead type check valve according to the first aspect, the annular groove is an annular dovetail, and the O-ring deformation preventing member is provided in the annular dovetail. Since the elastic member is provided on the outer periphery of the O-ring, air leakage from the O-ring mounting portion can be prevented with a simple configuration.
According to the lead type check valve according to the third aspect, in the lead type check valve according to the second aspect, since the elastic member is a leaf spring, air leakage from the O-ring mounting portion can be prevented with a simple configuration. can do.
According to the lead type check valve according to the fourth aspect, in the lead type check valve according to the third aspect, the leaf spring corresponds to a lower end outer peripheral portion of a virtual cone including an outer inner peripheral surface of the annular dovetail groove. Therefore, the above effect can be further enhanced.
According to the lead type check valve according to the fifth aspect, in the lead type check valve according to the second aspect, the O-ring deformation preventing member is provided inside a machining hole provided adjacent to the annular dovetail groove. Since the elastic member is provided, air leakage from the O-ring mounting portion can be prevented with a simple configuration.
According to the lead type check valve according to the sixth aspect, in the lead type check valve according to the fifth aspect, since the elastic member is a cylindrical C-ring, air leakage from the O-ring mounting portion can be achieved with a simple configuration. Can be prevented.
According to the lead type check valve according to claim 7, in the lead type check valve according to claim 1, the cross-sectional shape of the annular groove is U-shaped, and O-ring deformation prevention is provided in the annular groove. A bush as a member is provided inside, and the inner peripheral surface of the bush has a truncated cone shape to form an annular dovetail inside, and the O-ring is provided in the annular dovetail, so that it is simple. With this configuration, air leakage from the O-ring mounting portion can be prevented.
According to the lead type check valve according to claim 8, in the lead type check valve according to any one of claims 1 to 7, the valve box, a fluid inflow port provided in the valve box, A fluid outflow port provided in the valve box, wherein the fluid flow passage is provided so as to communicate the fluid inflow port and the fluid outflow port, and the reed valve body is provided with the fluid inflow port. This allows the normal flow of the fluid from the side to the fluid outflow port side and restricts the backflow, so that air leakage from the O-ring mounting portion can be prevented with a simple configuration.

FIG. 2 is a diagram showing the first embodiment of the present invention, and is a perspective view of the reed check valve with a lid removed. FIG. 3 is a diagram showing the first embodiment of the present invention, and is a cross-sectional view of the reed-type check valve with the valve portion opened. FIG. 2 is a cross-sectional view of the first embodiment of the present invention, showing the reed check valve in a state in which the valve portion is closed. FIG. 2 is a diagram showing the first embodiment of the present invention, and is a plan view of the reed check valve with a lid removed. FIG. 3 is a perspective view of a spring pin as an O-ring deformation preventing member according to the first embodiment of the present invention. FIG. 6A is a bottom view of the lid, and FIG. 6B is a cross-sectional view taken along the line VIb-VIb of FIG. 6A. FIG. 7A is a diagram showing a first embodiment of the present invention, in which FIG. 7A is a plan view showing a reed-type valve element, and FIG. 7B is a sectional view taken along the line VIIb-VIIb of FIG. 8 (a) is a plan view showing a valve receiver, and FIG. 8 (b) is a sectional view taken along the line VIIIb-VIIIb of FIG. 8 (a). FIG. 3 is a sectional view of the reed check valve in a state where a valve portion is open according to a second embodiment of the present invention. It is a figure which shows the 2nd Embodiment of this invention, and is a top view of the valve body of a reed type check valve. 11A is a diagram showing a second embodiment of the present invention, FIG. 11A is a diagram showing a virtual cone including an outer peripheral wall of an annular dovetail, and FIG. It is a figure which shows a part becoming an O-ring deformation prevention member. It is a figure showing a 3rd embodiment of the present invention, and is a sectional view showing the composition of the annular groove of the valve box main part, and its neighborhood. It is a figure showing a conventional example, and is a sectional view showing composition of a lift type check valve. FIG. 14A is a cross-sectional view illustrating a state in which a processing hole is drilled by an O-ring dovetail cutter, and FIG. 14B is a view illustrating the O-ring dovetail cutter. FIG. 14C is a cross-sectional view showing a state in which the O-ring dovetail cutter is moved along a predetermined circular orbit to form an annular dovetail groove.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. First, there is a valve box 1, and this valve box 1 is composed of a valve box main body 3 and a lid 5, as shown in FIG. A valve chamber 7 is provided between the valve body 3 and the lid 5 and on the lid 5 side. Various materials can be considered as the material of the valve body 3 and the lid 5.

  A fluid inflow port 9 is provided on one side (the left side in FIG. 2) of the valve box body 3, and a fluid outflow port 11 is provided on the other side (the right side in FIG. 2). A female screw portion 13 is formed in the fluid inflow port 9. Further, a female screw portion 15 is also formed in the fluid outflow port 11. For example, piping (not shown) is connected to the fluid inflow port 9 and the fluid outflow port 11.

As shown in FIG. 2, the valve chamber 7 and the fluid inflow port 9 are connected by a fluid inflow path 17, and the boundary between the valve chamber 7 and the fluid inflow path 17 is a fluid inflow port 19. I have. On the other hand, the valve chamber 7 and the fluid outflow port 11 are connected by a fluid outflow path 21, and a boundary between the valve chamber 7 and the fluid outflow path 21 is a fluid outflow port 23.
In the case of the first embodiment, the fluid inlet 19 functions as a part of the valve.

  As shown in FIGS. 2 to 4, an annular dovetail groove 25 is provided on the outer peripheral edge of the fluid inlet 19. As shown in FIGS. 2 and 3, the annular dovetail groove 25 has a substantially trapezoidal cross-sectional shape, and the width of the opening is smaller than the width of the bottom portion, thereby preventing protrusion. An O-ring 27 is provided in the annular dovetail groove 25. The annular dovetail groove 25 and the O-ring 27 are also part of the valve portion.

On the fluid outlet 23 side of the annular dovetail groove 25, a machining hole 26 provided at the time of machining remains as shown in FIG. Inside the processing hole 26, a spring pin 28 as an O-ring deformation preventing member is provided. As shown in FIG. 5, the spring pin 28 is a cylindrical C-ring having a notch 28a in a part in the circumferential direction.

  As shown in FIG. 4, female screw portions 29, 29, 29, 29 are provided at four corners of the upper end portion 3 a of the valve box main body 3, respectively. These four female screw portions 29, 29, 29, 29 are for fixing the lid 5 already described to the valve box body 3. That is, as shown in FIG. 6A, through holes 31, 31, 31, 31 are respectively formed at four corners of the lid 5. On the other hand, four fixing bolts 33, 33, 33, 33 are prepared, and these four bolts 33, 33, 33, 33 are passed through the through holes 31, 31, 31, 31 of the lid 5. The lid 5 is fixed to the valve box body 3 by screwing into the female screw portions 29, 29, 29, 29 of the valve box body 3.

  As shown in FIGS. 1 to 3, a reed-type valve element 35 is provided on the upper end 3 a of the valve body 3 where the fluid inlet 19 and the fluid outlet 23 are provided. The reed valve element 35 is also a part of the valve section. As shown in FIG. 7, a through hole 37 is formed at the base end side (the right side in FIG. 7) of the lead type valve body 35. Further, two mounting through holes 39 are provided on the proximal end side of the through hole 37 of the lead type valve body 35. The fluid inlet 19 of the valve body 3 is opened and closed by the front end 35a of the lead type valve body 35. The through hole 37 communicates with the fluid outlet 23 of the valve body 3.

  As shown in FIGS. 1 to 3, a valve receiver 41 is provided on the side of the reed valve body 35 opposite to the valve box main body 3. As shown in FIG. 8, a through hole 43 is formed at the base end side (the right side in FIG. 8) of the valve receiver 41. Further, two mounting through holes 45 are provided on the base end side of the through hole 43 of the valve receiver 41. The through hole 43 of the valve receiver 41 communicates with the through hole 37 of the lead type valve body 35 and the fluid outlet 23. Female screw portions 49, 49 are formed at the upper end 3a of the valve box body 3. The lead-type valve body 35 and the valve receiver 41 pass through the through holes 39 of the lead-type valve body 35 and the through-holes 45, 45 of the valve receiver 41 through the fixing screws 47, 47, and It is fixed by screwing into the screw portions 49, 49.

  As shown in FIGS. 2 and 3, an O-ring housing portion 51 is provided on the outer peripheral portion of the valve chamber 7 provided on the lid 5. An O-ring 53 is provided inside the O-ring storage 51. When the lid 5 is joined to the valve body 3, the O-ring 53 is sandwiched between the valve body 3 and the lid 5.

The operation will be described based on the above configuration.
First, as shown in FIG. 2, when the fluid tries to flow into the valve chamber 7 from the fluid inflow port 9 through the fluid inflow path 17 and the fluid inflow port 19, the reed valve body 35 is moved to the valve chamber 7 side by the pressure of the fluid. To the valve receiver 41. As a result, the fluid inlet 19 is opened, and the fluid flows through the fluid inlet 19, the through hole 43 of the valve receiver 41, the through hole 37 of the lead type valve body 35, the fluid outlet 23, and the fluid outlet 21. And flows out through the fluid outflow port 11.

  On the other hand, as shown in FIG. 3, when the fluid is going to flow backward, the reed valve 35 is urged toward the fluid inlet 19 by the pressure of the fluid and pressed against the fluid inlet 19. As a result, the fluid inlet 19 is closed by the front end 35a of the reed-type valve body 35, and backflow is prevented.

  In the above series of operations, the O-ring 27 prevents air leakage at the fluid inlet 19. Further, the O-ring 53 prevents air leakage from between the valve body 3 and the lid 5.

  Next, the operation of the spring pin 28 will be described. Even when the fluid inlet 19 is opened by the reed valve 35, the fluid flows at a high speed from the fluid inlet 19 to the valve chamber 7 side, and the O-ring 27 is urged outward by the flow velocity. There was a concern that the airbag would be deformed or bulged to the side, and air would leak from there. On the other hand, in the case of the present embodiment, since the spring pin 28 is provided inside the processing hole 26, such deformation and expansion of the O-ring 27 are prevented.

According to the present embodiment, the following effects can be obtained.
First, since the spring pin 28 as an O-ring deformation preventing member is provided in the processing hole 26 of the annular dovetail groove 25, deformation and swelling of the O-ring 27 to the outside are suppressed, and a normal state is maintained. Thereby, air leakage through the fluid inlet 9 can be prevented.
Also, since the spring pin 28 is a single component, component management is easy.
The mounting of the spring pin 28 into the processing hole 26 is also simple because the spring pin 28 may be pushed into the processing hole 26 while slightly reducing its diameter.

Next, a second embodiment of the present invention will be described with reference to FIGS.
In the case of the second embodiment, as shown in FIGS. 9 and 10, a backup ring 61 as an O-ring deformation preventing member is provided in the annular dovetail groove 25. The backup ring 61 is formed by bending a plate spring into an annular shape and inserting the plate spring into the annular dovetail groove 25 along the outer inner surface of the annular dovetail groove 25. The O-ring 27 is provided inside the backup ring 61. As shown in FIG. 10, both ends of the backup ring 61 are disposed 180 degrees opposite to the processing hole 26.

The backup ring 61 is manufactured by a procedure as shown in FIG. First, as shown in FIG. 11A, a virtual cone (shown by a virtual line in FIG. 11) including the outer inner peripheral surface of the annular dovetail groove 25 is assumed. When the virtual cone is developed, it becomes as shown in FIG. The backup ring 61 in the present embodiment corresponds to the base end of the developed virtual cone (shown by a solid line in FIG. 11B). Actually, both ends of the base end are cut off by a predetermined amount to shorten them. As a result, as shown in FIG.
The other configuration is the same as that of the first embodiment, and the same portions in the drawings are denoted by the same reference numerals and description thereof is omitted.

In the case of the second embodiment, the same effects as in the case of the first embodiment can be obtained.
Further, since the O-ring 27 is supported from substantially the entire circumference by the backup ring 61, its deformation and swelling can be reliably prevented.
Further, since the backup ring 61 has a shape corresponding to the base end of the virtual cone (indicated by a solid line in FIG. 11B), when the backup ring 61 is housed in the annular dovetail groove 25, it has an outer inner peripheral surface. They are arranged in close contact with each other, so that the above-mentioned effect can be further ensured.

  Next, a third embodiment of the present invention will be described with reference to FIG. In this embodiment, an annular groove 25 'is formed, and the cross-sectional shape of the annular groove 25' is U-shaped. Such an annular groove 25 'can be easily formed by ordinary lathe processing or milling processing without using a special tool such as a dovetail groove cutter.

An annular bush 201 is provided in the annular groove 25 '. The bush 201 has an inner peripheral surface in the shape of a truncated cone. Therefore, by inserting the bush 201 inside the annular groove 25 ', an annular dovetail groove 203 can be formed on the inner peripheral side. The O-ring 27 is provided in the annular dovetail 203.
The other configurations are the same as those of the first and second embodiments, and the same portions in the drawings are denoted by the same reference numerals and description thereof is omitted.

According to the above configuration, the same effects as in the first and second embodiments can be obtained.
In addition, since the need for machining the annular dovetail becomes unnecessary, the production becomes easy.

Note that the present invention is not limited to the first to third embodiments.
First, in the first to third embodiments, the spring ring, the leaf spring, and the annular bush have been described as examples of the O-ring deformation preventing member. However, the present invention is not limited thereto, and various configurations may be employed. Things are assumed.
Further, in the case of the first to third embodiments, the description has been given by taking the compressor as an example of the application. However, the present invention is not limited to this, and the lead type check valve used for various applications is not limited thereto. Applicable.
In addition, the configuration illustrated is merely an example.

  The present invention relates to a reed type check valve, and more particularly to a device which is devised so that air leakage from an O-ring mounting portion can be prevented by a simple structure. It is suitable for a check valve used to prevent the backflow of air to the check valve.

DESCRIPTION OF SYMBOLS 1 Valve box 3 Valve box main body 5 Lid 7 Valve room 9 Fluid inflow port 11 Fluid outflow port 17 Fluid inflow path 19 Fluid inflow (part of valve part)
21 Fluid Outflow Channel 23 Fluid Outlet 25 Annular Dovetail (Part of Valve)
26 Hole for processing 27 O-ring (part of valve part)
28 Spring pin (O-ring deformation prevention member)
35 Lead type valve element 41 Valve receiver 61 Backup ring (O-ring deformation prevention member)
201 bush (O-ring deformation prevention member)

Claims (8)

A valve portion provided in the middle of the fluid flow passage,
A lead-type valve body installed to close the valve portion,
An annular groove provided in the valve portion;
An O-ring mounted on the annular groove,
An O-ring deformation preventing member for preventing deformation of the O-ring,
A reed-type check valve characterized by comprising: The reed check valve according to claim 1,
The annular groove is an annular dovetail groove,
The reed-type check valve, wherein the O-ring deformation preventing member is an elastic member provided on an outer periphery of the O-ring in the annular dovetail groove. The reed check valve according to claim 2,
The resilient member is a leaf spring. The reed check valve according to claim 3,
The reed check valve, wherein the leaf spring corresponds to an outer peripheral portion of a lower end of a virtual cone including an outer inner peripheral surface of the annular dovetail groove. The reed check valve according to claim 2,
A reed-type check valve, wherein the O-ring deformation preventing member is an elastic member housed in a processing hole provided adjacent to the annular dovetail groove. The reed check valve according to claim 5,
The resilient member is a cylindrical C-ring. The reed check valve according to claim 1,
The cross-sectional shape of the annular groove is U-shaped, and a boss as an O-ring deformation preventing member is provided in the annular groove. The inner peripheral surface of the boss has a truncated conical shape, and an annular dovetail groove is formed inside. Wherein the O-ring is provided in the annular dovetail groove. The reed check valve according to any one of claims 1 to 7,
A valve box,
A fluid inflow port provided in the valve box,
A fluid outflow port provided in the valve box,
With
The fluid flow passage is provided to communicate the fluid inflow port and the fluid outflow port,
The reed-type check valve is characterized in that the reed-type valve element allows a normal flow of the fluid from the fluid inflow port side to the fluid outflow port side and regulates backflow.

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