Isobaric shuttle valve

Abstract

The utility model relates to an isobaric shuttle valve which comprises a valve shell, the valve shell is provided with a first inlet, a second inlet and an air outlet, a first passage is arranged between the first inlet and the air outlet, a second passage is arranged between the second inlet and the air outlet, and a switching assembly is arranged between the first passage and the second passage. The switching assembly controls opening and closing of the first passage and opening and closing of the second passage according to a preset switching air pressure value; the switching assembly comprises two valve bodies, the ends, away from each other, of the two valve bodies are each provided with a first stress face, the ends, close to each other, of the two valve bodies are each provided with a second stress face, an area ratio exists between the first stress faces and the second stress faces, and the area ratio is set according to the switching air pressure value. The conditions that in the related technology, when the two gas cylinders are connected in parallel to supply gas, the gas pressures output by the differential pressure type switching shuttle valve in sequence are inconsistent, secondary pressure regulation is needed, the residual pressure of the empty cylinders can be reduced only through manual operation, and waste is likely to be caused are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas supply equipment, in particular to an isobaric shuttle valve. Background Art

[0002] The function of the shuttle valve is pressure selection. When the pressure of one inlet is high, the other inlet is blocked, and the outlet pressure is equal to the corresponding inlet pressure. The above shuttle valve is a differential pressure switching shuttle valve. Due to the different pressures of the inlets on both sides, when the outlet is connected to the inlets on both sides respectively, it is difficult to ensure that the pressure of the gas or liquid output is the same. In actual application environments, secondary pressure adjustment is often required to ensure that the pressure of the gas or liquid output by the shuttle valve remains consistent.

[0003] In the special gas industry, shuttle valves are often used in gas pipelines where two gas cylinders are connected in parallel. If a differential pressure switching shuttle valve is used, the side with higher pressure needs to be ventilated first, and the side with lower pressure is kept as a standby. This results in inconsistent gas pressures being output successively.

[0004] There is a defect that the gas supply is stopped when the residual pressure of the empty bottle of the gas cylinder does not reach the standard reserved residual pressure value. Manual operation is required to reduce the residual pressure of the empty bottle, which is easy to cause waste. Utility Model Content

[0005] In order to improve the situation in the related art that when two gas cylinders are connected in parallel to supply gas, the gas pressures output successively by the differential pressure switching shuttle valve are inconsistent, requiring secondary pressure regulation and manual operation to reduce the residual pressure of the empty bottles, which easily causes waste. The present application provides an isobaric shuttle valve to improve the situation that the gas pressures output successively by the differential pressure switching shuttle valve are inconsistent, and no manual operation is required during switching, thereby reducing the waste of residual pressure of the empty bottles.

[0006] The present application provides an isobaric shuttle valve, which adopts the following technical solution:

[0007] An isobaric shuttle valve, the shuttle valve comprising a valve housing, the valve housing being provided with a first inlet, a second inlet and an air outlet, a first passage being provided between the first inlet and the air outlet, a second passage being provided between the second inlet and the air outlet, a switching component being provided between the first passage and the second passage, the switching component controlling the opening and closing of the first passage and the opening and closing of the second passage according to a preset switching air pressure value;

[0008] The switching component includes valve bodies respectively slidably arranged in the first passage and the second passage, the valve bodies are used to open and close the corresponding passages, a compression spring is arranged between the two valve bodies and they are coaxially arranged, the ends of the two valve bodies that are away from each other respectively have a first force-bearing surface, and the ends of the two valve bodies that are close to each other respectively have a second force-bearing surface, then there is an area ratio between the first force-bearing surface and the second force-bearing surface, and the area ratio is set according to the switching air pressure value.

[0009] Optionally, a sealing ring group is provided on the valve body, and the sealing ring group includes a first sealing ring and a second sealing ring, the first sealing ring is arranged at the first stress-bearing surface, the second sealing ring is arranged at the second stress-bearing surface, and the first sealing ring and the second sealing ring are both against the inner wall of the valve housing.

[0010] Optionally, a guide section is provided on one side of the two valve bodies away from each other, and the first passage and the second passage are both provided with a first step groove for limiting the guide section, and the side wall of the guide section includes a guide arc surface and a yield surface provided on the opposite side, and the guide arc surface is abutted against the inner wall of the valve housing, and a gap is left between the yield surface and the inner wall of the valve housing.

[0011] Optionally, a first annular groove for installing the first sealing ring is formed on one side of the two valve bodies away from each other, and the first annular groove is located on a side of the guide joint away from the other valve body.

[0012] Optionally, a second annular groove for installing the second sealing ring is provided on one side of the two valve bodies close to each other, and the second annular groove is located on a side of the guide joint close to the other valve body.

[0013] Optionally, a second stepped groove for installing the compression spring is formed at one end of the two valve bodies close to each other, and both ends of the compression spring are respectively limited to the corresponding convex edges of the second stepped groove.

[0014] Optionally, one end of the two valve bodies close to each other has a limit ring, the side wall of the limit ring abuts against the inner wall of the valve housing, and the inner wall of the valve housing is provided with a third step groove for the limit ring to slide within a preset stroke range.

[0015] By adopting the above technical solution, the first inlet and the second inlet of the isobaric shuttle valve have the same gas pressure, the side that is ventilated first serves as the air supply side, and the other side serves as the standby side. If the first passage is ventilated first, the two valve bodies are offset toward the second air inlet to close the second passage; when the air pressure reaches the switching air pressure value, the two valve bodies are offset toward the first air inlet to close the first passage and connect the second passage, thereby realizing automatic switching action without manual operation.

[0016] Since the switching air pressure value is related to the area ratio, the switching air pressure value is adjusted by pre-setting the area ratio of the first force-bearing surface and the second force-bearing surface of the valve body and according to the ideal empty bottle residual pressure. In the actual working process, there is no need to manually reduce the empty bottle residual pressure, thereby reducing gas waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be discussed below. Obviously, the technical solutions described in conjunction with the drawings are only some embodiments of the utility model. For ordinary technicians in this field, other embodiments and their drawings can be obtained based on the embodiments shown in these drawings without paying creative work.

[0018] Figure 1 It is a structural diagram of the valve housing.

[0019] Figure 2 It is a partial exploded view of the valve housing with the valve body.

[0020] Figure 3 It is a partial exploded view of the valve housing without the valve body.

[0021] Figure 4 It is a structural diagram of the valve body and sealing ring group.

[0022] Figure 5 It is an exploded view of the valve body and sealing ring assembly.

[0023] Figure 6 It is a cross-sectional view of the shuttle valve in the initial state.

[0024] Figure 7 This is a cross-sectional view of the shuttle valve when the second passage is open.

[0025] Figure 8 It is a graph of inlet pressure and switching pressure.

[0026] In the figure: 1. valve housing; 2. first inlet; 3. second inlet; 21. air outlet; 4. first passage; 5. second passage; 6. valve body; 7. compression spring; 8. first force-bearing surface; 9. second force-bearing surface; 10. first sealing ring; 11. second sealing ring; 12. guide joint; 13. first step groove; 14. guide arc surface; 15. give way surface; 16. first annular groove; 17. second annular groove; 18. second step groove; 19. limit ring; 20. third step groove. DETAILED DESCRIPTION

[0027] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions of the various embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] The embodiment of the utility model provides an isobaric shuttle valve, such as Figures 1 to 8 As shown, the shuttle valve includes a valve housing 1, the valve housing 1 is provided with a first inlet 2, a second inlet 3 and an air outlet 21, a first passage 4 is provided between the first inlet 2 and the air outlet 21, a second passage 5 is provided between the second inlet 3 and the air outlet 21, a switching component is provided between the first passage 4 and the second passage 5, and the switching component controls the opening and closing of the first passage 4 and the opening and closing of the second passage 5 according to a preset switching air pressure value;

[0029] The switching assembly includes valve bodies 6 which are respectively slidably arranged in the first passage 4 and the second passage 5. The valve bodies 6 are used to open and close the corresponding passages. A compression spring 7 is arranged between the two valve bodies 6 and is coaxially arranged. The ends of the two valve bodies 6 that are away from each other have first force surfaces 8 respectively, and the ends of the two valve bodies 6 that are close to each other have second force surfaces 9 respectively. There is an area ratio between the first force surface 8 and the second force surface 9, and the area ratio is set according to the switching air pressure value.

[0030] Specifically, in this embodiment, the first inlet 2 and the second inlet 3 of the isobaric shuttle valve have the same input gas pressure, the side that is ventilated first serves as the air supply side, and the other side serves as the standby side. If the first passage 4 is ventilated first, the two valve bodies 6 are offset toward the second air inlet to close the second passage 5; when the air pressure reaches the switching air pressure value, the two valve bodies 6 are offset toward the first air inlet, so that the first passage 4 is closed and the second passage 5 is connected, thereby realizing automatic switching action without manual operation.

[0031] Since the switching air pressure value is related to the area ratio, the switching air pressure value is adjusted by pre-setting the area ratio of the first force-bearing surface 8 and the second force-bearing surface 9 of the valve body 6 and according to the ideal empty bottle residual pressure. In the actual working process, there is no need to manually reduce the empty bottle residual pressure, thereby reducing gas waste.

[0032] In a preferred embodiment of the utility model, a sealing ring group is provided on the valve body 6, and the sealing ring group includes a first sealing ring 10 and a second sealing ring 11. The first sealing ring 10 is arranged at the first force-bearing surface 8, and the second sealing ring 11 is arranged at the second force-bearing surface 9. The first sealing ring 10 and the second sealing ring 11 are both against the inner wall of the valve housing 1.

[0033] Specifically, in this embodiment, the sealing ring assembly provides good sealing performance for the reserve air side.

[0034] The area of ​​the first force-bearing surface 8 is defined as , the area of ​​the second force-bearing surface 9 is , the air pressure at the first air inlet is , the air pressure value is , the air pressure at the second air inlet is , the air pressure value is , the friction force of the sealing ring group is , the force of the spring on the valve body 6 is , then we get When the valve body 6 moves to the second air inlet for switching, the first force-bearing surface 8 and the second force-bearing surface 9 refer to the two end surfaces of the valve body 6 on which the air pressure acts.

[0035] Specifically, the first force-bearing surface 8 is the windward surface formed by the first sealing ring 10 and the valve body 6, that is, ,in, Take 3.1415, is the diameter of the first sealing ring 10; the second force-bearing surface 9 is the windward surface formed by the first sealing ring 10 and the valve body 6, that is, ,in, Take 3.1415, is the diameter of the second sealing ring 11.

[0036] because , Compared with the air pressure, it is very small and can be ignored, so the above formula can be simplified to:

[0037] ,Right now , then the switching pressure value is The corresponding pressure value is .

[0038] Depend on It can be concluded that: .

[0039] In this embodiment, the design The theoretical value of is 0.4, that is .

[0040] Referring to the inlet pressure and switching pressure curve, set the initial value of the inlet pressure of the first inlet and the second inlet for , the pressure on the air supply side drops to When , valve body 6 starts to switch.

[0041] In a preferred embodiment of the present utility model, a guide section 12 is provided on the side of the two valve bodies 6 away from each other, and the first passage 4 and the second passage 5 are both provided with a first stepped groove 13 for limiting the guide section 12. The side wall of the guide section 12 includes a guide arc surface 14 and a clearance surface 15 provided on the opposite side. The guide arc surface 14 is against the inner wall of the valve housing 1, and a gap is left between the clearance surface 15 and the inner wall of the valve housing 1.

[0042] Specifically, in this embodiment, the guide joint 12 has a guiding effect on the gas, and the yield surface 15 is formed by milling the opposite edges, and the yield surface 15 is used to ensure that the gas has enough circulation space.

[0043] In a preferred embodiment of the utility model, a first annular groove 16 for installing the first sealing ring 10 is formed on the side of the two valve bodies 6 away from each other. The first annular groove 16 is located on the side of the guide section 12 away from the other valve body 6 .

[0044] In a preferred embodiment of the utility model, a second annular groove 17 for installing the second sealing ring 11 is provided on the side of the two valve bodies 6 close to each other, and the second annular groove 17 is located on the side of the guide section 12 close to the other valve body 6 .

[0045] Specifically, in this embodiment, the first sealing ring 10 is embedded in the first annular groove 16 , and the second sealing ring 11 is embedded in the second annular groove 17 . The structure is simple and can effectively ensure the sealing of the first passage 4 and the second passage 5 .

[0046] In a preferred embodiment of the present invention, a second stepped groove 18 for installing the compression spring 7 is formed at one end of the two valve bodies 6 close to each other, and both ends of the compression spring 7 are respectively limited at the convex edges of the corresponding second stepped groove 18 .

[0047] Specifically, in this embodiment, both ends of the compression spring 7 are located between the two valve bodies 6 , and the compression spring 7 is coaxially arranged with the two valve bodies 6 , so that the valve bodies 6 can slide smoothly in the valve housing 1 .

[0048] In a preferred embodiment of the utility model, the ends of the two valve bodies 6 close to each other have a limit ring 19, the side wall of the limit ring 19 abuts against the inner wall of the valve housing 1, and the inner wall of the valve housing 1 is provided with a third step groove 20 for the limit ring 19 to slide within a preset stroke range.

[0049] Specifically, in this embodiment, by providing the third stepped groove 20 , the displacement of the valve body 6 when sliding toward one side can be controlled.

Claims

1. An isobaric shuttle valve, comprising a valve housing (1), wherein the valve housing (1) is provided with a first inlet (2), a second inlet (3) and an air outlet (21), characterized in that: A first passage (4) is provided between the first inlet (2) and the air outlet (21), a second passage (5) is provided between the second inlet (3) and the air outlet (21), a switching component is provided between the first passage (4) and the second passage (5), and the switching component controls the opening and closing of the first passage (4) and the opening and closing of the second passage (5) according to a preset switching air pressure value; The switching assembly comprises valve bodies (6) respectively slidably arranged in the first passage (4) and the second passage (5), the valve bodies (6) being used to open and close the corresponding passages, a compression spring (7) being arranged between the two valve bodies (6) and being coaxially arranged, the ends of the two valve bodies (6) being away from each other respectively having a first force-bearing surface (8), and the ends of the two valve bodies (6) being close to each other respectively having a second force-bearing surface (9), and an area ratio is provided between the first force-bearing surface (8) and the second force-bearing surface (9), and the area ratio is set according to the switching air pressure value.

2. The isobaric shuttle valve according to claim 1, characterized in that: A sealing ring group is arranged on the valve body (6), and the sealing ring group comprises a first sealing ring (10) and a second sealing ring (11); the first sealing ring (10) is arranged at the first force-bearing surface (8), and the second sealing ring (11) is arranged at the second force-bearing surface (9); the first sealing ring (10) and the second sealing ring (11) both abut against the inner wall of the valve housing (1).

3. The isobaric shuttle valve according to claim 2, characterized in that: A guide section (12) is provided on the side of the two valve bodies (6) that is away from each other. The first passage (4) and the second passage (5) are both provided with a first stepped groove (13) for limiting the guide section (12). The side wall of the guide section (12) includes a guide arc surface (14) and a clearance surface (15) provided on the opposite side. The guide arc surface (14) abuts against the inner wall of the valve housing (1), and a gap is left between the clearance surface (15) and the inner wall of the valve housing (1).

4. The isobaric shuttle valve according to claim 3, characterized in that: A first annular groove (16) for installing the first sealing ring (10) is provided on one side of the two valve bodies (6) away from each other. The first annular groove (16) is located on the side of the guide joint (12) away from the other valve body (6).

5. The isobaric shuttle valve according to claim 4, characterized in that: A second annular groove (17) for installing the second sealing ring (11) is provided on one side of the two valve bodies (6) close to each other. The second annular groove (17) is located on the side of the guide joint (12) close to the other valve body (6).

6. The isobaric shuttle valve according to claim 5, characterized in that: A second stepped groove (18) for installing the compression spring (7) is provided at one end of the two valve bodies (6) close to each other, and both ends of the compression spring (7) are respectively limited at the convex edges of the corresponding second stepped groove (18).

7. The isobaric shuttle valve according to claim 6, characterized in that: One end of the two valve bodies (6) close to each other is provided with a limit ring (19), the side wall of the limit ring (19) abuts against the inner wall of the valve housing (1), and the inner wall of the valve housing (1) is provided with a third stepped groove (20) for the limit ring (19) to slide within a preset stroke range.

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