TWI628359B - Check valve - Google Patents

Abstract

A check valve includes a guide sleeve, a fixed piece sleeve, a valve core, a first elastic member, a valve piece, a fixed seat and a cover. The guide sleeve has a guide hole. The fixing piece cover has a through hole, and the through hole has an inner ring inclined surface. The valve core has a first end, a second end, and a stop portion. The first end is movably disposed in the guide hole, and the second end is movably disposed in the through hole. The second end has an outer ring arc surface, and the outer ring arc surface and the inner ring inclined surface abut each other. The first elastic member is disposed on the valve core, and two ends of the first elastic member abut against the stopper portion and the fixed sheet sleeve, respectively. The valve plate is arranged on the fixed plate sleeve. The fixing base is arranged on the fixing piece cover. The valve disc is clamped between the fixed disc cover and the fixed seat. The cover body is arranged on the fixing piece cover, and the cover body covers the through hole.

Description

Check valve

The present invention relates to a check valve, and more particularly to a check valve capable of closely fitting a valve disc to an exhaust hole.

The check valve is used to restrict the fluid to flow in only one direction, so that the fluid will not flow backward. A check valve is usually provided in the exhaust hole between the compressor and the condenser to prevent the high-pressure fluid from flowing back into the low-pressure side of the compressor after the compressor stops.

Please refer to FIG. 1, which is a schematic cross-sectional view of a prior art check valve 1 provided in a compressor 3. As shown in FIG. 1, the check valve 1 includes a guide sleeve 10, a valve seat 12, a valve core 14, a valve disc 16, a fixed seat 18, a nut 20, and a spring 22. A first end 140 of the valve core 14 is disposed in the guide sleeve 10. The valve seat 12, the valve disc 16 and the fixed seat 18 are all disposed on a second end 142 of the valve core 14, and the valve disc 16 is sandwiched between the valve seat 12 and the fixed seat 18. The nut 20 is locked on the second end 142 of the valve core 14 to fix the valve seat 12, the valve disc 16 and the fixing seat 18 on the second end 142 of the valve core 14. The spring 22 is disposed on the guide sleeve 10, and one end of the spring 22 abuts against the fixing base 18.

When the check valve 1 is disposed in the compressor 3, the valve plate 16 abuts the edge opening 300 of the exhaust hole 30 of the compressor 3, and the guide sleeve 10 is fixed to the end cover 32 of the compressor 3. When the edge opening 300 of the exhaust hole 30 and / or the surface 320 of the end cover 32 in contact with the guide sleeve 10 is not flat due to poor processing accuracy, the valve plate 16 may not be able to closely fit the exhaust hole 30 After the compressor 3 is stopped, the problem that high-pressure fluid flows back into the low-pressure side of the compressor 3 occurs.

The invention provides a non-return valve capable of closely fitting a valve disc to an exhaust hole to solve the above problems.

According to an embodiment, the check valve of the present invention includes a guide sleeve, a fixed piece sleeve, a valve core, a first elastic member, a valve piece, a fixed seat, and a cover. The guide sleeve has a guide hole. The fixing piece cover has a through hole, and the through hole has an inner ring inclined surface. The valve core has a first end, a second end, and a stop portion, wherein the first end is opposite to the second end, and the stop portion is located between the first end and the second end. The first end is movably disposed in the guide hole, and the second end is movably disposed in the through hole. The second end has an outer ring arc surface, and the outer ring arc surface and the inner ring inclined surface abut each other. The first elastic member is disposed on the valve core, and two ends of the first elastic member abut against the stopper portion and the fixed sheet sleeve, respectively. The valve plate is arranged on the fixed plate sleeve. The fixing base is arranged on the fixing piece cover. The valve disc is clamped between the fixed disc cover and the fixed seat. The cover body is arranged on the fixing piece cover, and the cover body covers the through hole.

In summary, the present invention enables the second end of the valve core to be movably disposed in the through hole of the fixed piece cover, and a first elastic member is provided on the valve core. In addition, the second end of the valve core and the through hole of the fixed piece cover are in contact with each other by the outer ring arc surface and the inner ring inclined surface. When the edge of the vent hole and / or the surface of the end cap that is in contact with the guide sleeve is not flat due to poor machining accuracy, it can be produced by the cooperation of the outer ring arc surface and the inner ring inclined surface and the first elastic member The elasticity of the valve plate is finely adjusted to make the valve plate closely fit the exhaust hole. This can effectively avoid the problem of high-pressure fluid flowing back into the low-pressure side of the compressor after the compressor is stopped. In addition, the present invention provides a cover on the fixing sheet cover for covering the through hole to prevent fluid from leaking from the through hole.

The advantages and spirit of the present invention can be further understood through the following detailed description of the invention and the accompanying drawings.

Please refer to FIG. 2, which is a schematic cross-sectional view of a check valve 5 provided in a compressor 7 according to an embodiment of the present invention. It should be noted that the check valve 5 of the present invention can also be installed in other devices that need to be provided with a check valve, and is not limited to being installed in a compressor. As shown in FIG. 2, the check valve 5 includes a guide sleeve 50, a fixed piece sleeve 52, a valve core 54, a first elastic member 56, a valve piece 58, a fixed seat 60, a cover 62 and A second elastic member 64, and the compressor 7 includes an exhaust hole 70 and an end cover 72.

The guide sleeve 50 has a guide hole 500. The guide sleeve 50 is fixed to the end cover 72 of the compressor 7. The fixing piece cover 52 has a through hole 520, and the through hole 520 has an inner ring inclined surface 522. The spool 54 has a first end 540, a second end 542, and a stop portion 544. The first end 540 is opposite to the second end 542, and the stop portion 544 is located between the first end 540 and the second end 542. between. The first end 540 of the valve core 54 is movably disposed in the guide hole 500 of the guide sleeve 50, and the second end 542 of the valve core 54 is movably disposed in the through hole 520 of the fixed piece sleeve 52. In other words, the valve core 54 can move relative to the guide sleeve 50 and the fixed piece sleeve 52.

The second end 542 of the spool 54 has an outer annular arc surface 546. As shown in FIG. 2, when the second end 542 of the spool 54 is disposed in the through hole 520 of the fixed piece sleeve 52, the outer ring arc surface 546 and the inner ring inclined surface 522 abut each other. The first elastic member 56 is disposed on the valve core 54, and two ends of the first elastic member 56 abut against the stopper portion 544 and the fixing piece cover 52, respectively. In this embodiment, the valve core 54 may include a core body 548 and a nut 550, wherein the nut 550 is disposed on the core body 548 and provides an outer ring arc surface 546. When assembling, the first elastic member 56 can be sleeved on the core 548, one end of the core 548 is passed through the through hole 520 of the fixing piece sleeve 52, and then the nut 550 is locked on the core 548. At this time, the first elastic member 56 is compressed by the fixing piece cover 52 and the stopping portion 544 to generate an elastic force. The elastic force generated by the first elastic member 56 pushes the fixing piece sleeve 52 in the direction of the nut 550, so that the outer ring curved surface 546 and the inner ring inclined surface 522 abut each other. In this embodiment, the first elastic member 56 may be a spring.

The valve plate 58 and the fixed seat 60 are both disposed on the fixed plate cover 52, and the valve plate 58 is sandwiched between the fixed plate cover 52 and the fixed seat 60. In this embodiment, the material of the valve plate 58 may be polytetrafluoroethylene (commonly known as Teflon). The fixing seat 60 is used for fixing the valve plate 58 to prevent the valve plate 58 from being deformed. The cover body 62 is disposed on the fixing piece cover 52, and the cover body 62 covers the through hole 520. In this embodiment, the cover body 62 may be a nut, which is locked on the fixing piece cover 52 to prevent fluid from leaking from the through hole 520. The second elastic member 64 is disposed on the guide sleeve 50. One end of the second elastic member 64 abuts against the fixing base 60, and the other end of the second elastic member 64 abuts on the end cover 72 of the compressor 7. In this embodiment, the second elastic member 64 may be a spring.

As shown in FIG. 2, when the check valve 5 is provided in the compressor 7, the valve plate 58 abuts the edge 700 of the exhaust hole 70 of the compressor 7, and the guide sleeve 50 is fixed at the end of the compressor 7. Cover 72. At this time, the second elastic member 64 is compressed by the fixing base 60 and the end cap 72 to generate an elastic force. The elastic force generated by the second elastic member 64 pushes the valve plate 58 in the direction of the exhaust hole 70, so that the valve plate 58 fits the exhaust hole 70. When the edge opening 700 of the exhaust hole 70 and / or the surface 720 of the end cap 72 that is in contact with the guide sleeve 50 is not flat due to poor processing accuracy, the outer arc surface 546 of the spool 54 can be used to fix the With the cooperation of the inner ring inclined surface 522 of the sheet cover 52 and the elastic force generated by the first elastic member 56, the valve sheet 58 provided on the fixed sheet cover 52 is finely adjusted so that the valve sheet 58 closely fits the exhaust hole 70. This can effectively avoid the problem that high-pressure fluid flows back into the low-pressure side of the compressor 7 after the compressor 7 is stopped. In addition, the present invention provides a cover 62 on the fixing piece cover 52 for covering the through hole 520 to prevent fluid from leaking from the through hole 520.

Please refer to FIG. 3, which is a schematic cross-sectional view of a check valve 5 ′ provided in the compressor 7 according to another embodiment of the present invention. The main difference between the check valve 5 ′ and the above-mentioned check valve 5 is that the structure of the valve core 54 ′ of the check valve 5 ′ and the valve core 54 of the check valve 5 are different. As shown in FIG. 3, the spool 54 'of the check valve 5' includes a first core 552 and a second core 554. The second core 554 is connected to the first core 552 and provides an outer arc. Face 546. In this embodiment, one end of the second core 554 may be designed as a spherical shape to serve as the outer arc surface 546.

During assembly, one end of the second core 554 may be first passed through the through hole 520 of the fixing piece cover 52, the first elastic member 56 is sleeved on the second core 554, and then the second core 554 is connected to the first A core 552. At this time, the first elastic member 56 is compressed by the fixing piece cover 52 and the stopping portion 544 to generate an elastic force. The elastic force generated by the first elastic member 56 pushes the fixing piece sleeve 52 in the direction of the nut 550, so that the outer ring curved surface 546 and the inner ring inclined surface 522 abut each other. In this embodiment, the connection manner of the second core body 554 and the first core body 552 may be screw locking, engaging or other fixing methods. It should be noted that the elements with the same reference numerals as shown in FIG. 3 and FIG. 2 have substantially the same working principle, and will not be repeated here.

In summary, the present invention enables the second end of the valve core to be movably disposed in the through hole of the fixed piece cover, and a first elastic member is provided on the valve core. In addition, the second end of the valve core and the through hole of the fixed piece cover are in contact with each other by the outer ring arc surface and the inner ring inclined surface. When the edge of the vent hole and / or the surface of the end cap that is in contact with the guide sleeve is not flat due to poor machining accuracy, it can be produced by the cooperation of the outer ring arc surface and the inner ring inclined surface and the first elastic member The elasticity of the valve plate is finely adjusted to make the valve plate closely fit the exhaust hole. This can effectively avoid the problem of high-pressure fluid flowing back into the low-pressure side of the compressor after the compressor is stopped. In addition, the present invention provides a cover on the fixing sheet cover for covering the through hole to prevent fluid from leaking from the through hole. The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the scope of patent application of the present invention shall fall within the scope of the present invention.

1, 5, 5'‧‧‧ check valve
3, 7‧‧‧ compressor
10, 50‧‧‧ guide sleeve
12‧‧‧Valve seat
14, 54, 54'‧‧‧ spool
16, 58‧‧‧ valve discs
18, 60‧‧‧Fixed
20‧‧‧nut
22‧‧‧Spring
30, 70‧‧‧ exhaust vent
32, 72‧‧‧ end caps
52‧‧‧Fixed Case
56‧‧‧The first elastic piece
62‧‧‧ Cover
64‧‧‧Second elastic member
140, 540‧‧‧ first end
142, 542‧‧‧ second end
300, 700‧‧‧ margin
320, 720‧‧‧ surface
500‧‧‧ guide hole
520‧‧‧through hole
522‧‧‧Inner ring bevel
544‧‧‧stop
546‧‧‧outer arc surface
548‧‧‧ core
550‧‧‧nut
552‧‧‧first core
554‧‧‧second core

FIG. 1 is a schematic cross-sectional view of a prior art check valve installed in a compressor. FIG. 2 is a schematic cross-sectional view of a check valve provided in a compressor according to an embodiment of the present invention. FIG. 3 is a schematic cross-sectional view of a check valve provided in a compressor according to another embodiment of the present invention.

Claims (4)

A check valve includes: a guide sleeve having a guide hole; a fixed piece sleeve having a through hole having an inner ring inclined surface; a valve core having a first end, a second end, and A stopper, the first end is opposite to the second end, the stopper is located between the first end and the second end, and the first end is movably disposed in the guide hole, the first end Two ends are movably disposed in the through hole, the second end has an outer ring arc surface, and the outer ring arc surface and the inner ring inclined surface abut each other; a first elastic member is provided on the valve core, The two ends of the first elastic member are respectively abutted against the stopper portion and the fixed piece cover; a valve piece is provided on the fixed piece cover; a fixed seat is provided on the fixed piece cover; the valve piece holder The cover is placed between the fixed piece cover and the fixed base; and a cover is disposed on the fixed piece cover, and the cover covers the through hole. The check valve according to claim 1, wherein the valve core includes a core body and a nut, the nut is disposed on the core body and provides the outer ring arc surface. The check valve according to claim 1, wherein the valve core includes a first core body and a second core body, the second core body is connected to the first core body and provides the outer ring arc surface. The check valve according to claim 1, further comprising a second elastic member disposed on the guide sleeve, and one end of the second elastic member abuts against the fixed seat.