Shuttle valve for air bag pump and air bag pump

Abstract

The utility model belongs to the technical field of air bag pumps, and particularly relates to a shuttle valve for an air bag pump and the air bag pump. The shuttle valve comprises a shell, a cavity is formed in the shell, and a gas inlet port, a first gas port, a second gas port, a third gas port and a fourth gas port are formed in the side wall of the shell in a penetrating mode; the sliding block axially moves in the cavity, a first annular groove and a second annular groove are formed in the side wall of the sliding block, and the first annular groove communicates with the first gas port and communicates with the gas inlet port or the third gas port along with axial movement of the sliding block; the second annular groove is communicated with the second gas port and is communicated with the gas inlet port or the fourth gas port along with axial movement of the sliding block, and the areas of the end faces, away from each other, of the first annular groove and the second annular groove are larger than those of the end faces close to each other. The shuttle valve effectively improves the axial acting force of the driving fluid by increasing the area of the acting end face of the driving fluid, realizes quick reversing and prevents the sliding block from being stuck.

Description

Technical Field

[0001] This utility model belongs to the field of airbag pump technology, specifically relating to a shuttle valve and an airbag pump for use in airbag pumps. Background Technology

[0002] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and is not necessarily to be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

[0003] A typical airbag pump includes a pump body and a shuttle valve, with the shuttle valve mounted directly or indirectly on the pump body. The pump body includes two target fluid chambers, each containing an expandable or contractible airbag. The expansion or contraction of the airbag allows for the intake or discharge of the target fluid within the target fluid chamber. The shuttle valve includes a slider that reciprocates between a first position and a second position. When the slider is in the first position, the shuttle valve delivers driving fluid to the first airbag; when the slider is in the second position, the shuttle valve delivers driving fluid to the second airbag.

[0004] In existing technology, the driving fluid enters the shuttle valve, and the slider connects to the external air source and the air bag to be expanded, as well as to the atmosphere and the air bag to be contracted, through grooves. The driving fluid released from the air bag to be contracted generates an axial force that holds the slider in the first position. When the axial force generated by contraction is less than the axial force generated by expansion, the slider moves in the other direction to the second position to complete the reversal. In addition to the force generated by the driving fluid, the reversing gas in the reversing pipe also generates a certain force on the end face of the slider to assist the reversal, but the reversal mainly depends on the axial force generated by the driving fluid. The axial force depends on the pressure of the driving fluid and the area of ​​action. The pressure of the driving fluid is difficult to increase significantly due to factors such as the pressure of the external air source and the material of the air bag pump, while increasing the area of ​​action is often accompanied by an increase in the volume of the groove, which leads to a decrease in fluid pressure. Therefore, the existing shuttle valve technology cannot meet the needs of rapid reversal. Furthermore, the slider in the shuttle valve may get stuck at the first and second positions. In this case, the first and second air bags cannot expand and contract normally, and the operator cannot quickly move the slider to the first and second positions, which increases the labor intensity of the operator and also affects the pumping efficiency of the reciprocating pump to the target fluid. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a shuttle valve and a wind bag pump for a wind bag pump. The shuttle valve effectively increases the axial force of the driving fluid by increasing the working end face area of ​​the driving fluid, thereby achieving rapid reversal and avoiding slider jamming.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0007] In a first aspect, this utility model provides a shuttle valve for a wind bag pump, comprising:

[0008] The housing has an internal cavity, and an air inlet port, a first gas port, a second gas port, a third gas port and a fourth gas port are provided through the side wall of the housing. The first gas port and the second gas port are respectively located on the axial outer side of the air inlet port, the third gas port is located on the axial outer side of the first gas port, and the fourth gas port is located on the axial outer side of the second gas port.

[0009] The slider moves axially within the cavity. The sidewall of the slider has a first annular groove and a second annular groove. The first annular groove is connected to a first gas port and moves axially with the slider to connect to an air inlet port or a third gas port. The second annular groove is connected to a second gas port and moves axially with the slider to connect to an air inlet port or a fourth gas port. The area of ​​the end faces of the first annular groove and the second annular groove that are far apart from each other is larger than the end faces that are close to each other.

[0010] Preferably, the depths of the first annular groove and the second annular groove decrease sequentially from the end faces that are far apart to the end faces that are close to each other.

[0011] Preferably, a deepened annular groove is formed on one side of the end face of the first annular groove and the second annular groove that are far apart from each other.

[0012] Preferably, the housing includes a cylindrical portion and a cover portion, wherein the cover portion seals the openings at both ends of the cylindrical portion.

[0013] More preferably, the cover is provided with a through-hole gas reversing port.

[0014] More preferably, it also includes a positioning rod, one end of which is slidably connected to a positioning groove provided on the end face of the slider, and the other end is slidably connected to the cover.

[0015] More preferably, the positioning rod extends out of the cover and forms a sliding seal with the cover through an O-ring.

[0016] More preferably, one end of the positioning rod that is slidably connected to the positioning groove is provided with a pressing part, the diameter of the pressing part being larger than that of the positioning rod, and the positioning groove having a circular edge at the end face of the slider, the inner diameter of the circular edge being larger than that of the positioning rod, and the inner diameter of the circular edge being smaller than that of the pressing part.

[0017] Preferably, the third gas port and the fourth gas port are respectively connected to a silencer exhaust valve.

[0018] Secondly, this utility model provides a wind bag pump, including a pump body and a shuttle valve as described in the first aspect.

[0019] The beneficial effects achieved by one or more technical solutions of this utility model are as follows:

[0020] The shuttle valve has a first annular groove and a second annular groove on its slider, where the areas of the mutually spaced end faces are larger than those of the mutually close end faces. This increases the working end face area of ​​the driving fluid, effectively improves the axial force of the driving fluid, achieves rapid reversal, and avoids slider jamming.

[0021] The shuttle valve is equipped with a positioning rod, which can guide the axial movement of the slider and drive the slider to move when it is stuck, so that the slider can return to normal working state. Attached Figure Description

[0022] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0023] Figure 1 This is a cross-sectional view of the shuttle valve in Example 1;

[0024] Figure 2 This is a cross-sectional view of the shuttle valve in Example 1;

[0025] In the figure, 1 is the housing, 11 is the air inlet port, 12 is the first gas port, 13 is the second gas port, 14 is the third gas port, 15 is the fourth gas port, 2 is the slider, 21 is the first annular groove, 22 is the second annular groove, 23 is the deepened annular groove, 3 is the cylindrical part, 4 is the cover part, 41 is the reversing gas port, 5 is the positioning rod, 51 is the extrusion part, 6 is the positioning groove, 61 is the annular edge part, and 7 is the O-ring seal. Detailed Implementation

[0026] As described in the background section, the axial force required to drive the shuttle valve for reversing is relatively low in the prior art, making it difficult to increase the pressure of the driving fluid and thus failing to meet the requirements for rapid reversing. Furthermore, the slider in the shuttle valve may become stuck at the first and second positions, increasing the workload of the operator and affecting the pumping efficiency of the reciprocating pump on the target fluid.

[0027] To solve the above-mentioned technical problems, this utility model provides a shuttle valve for a wind bag pump and a wind bag pump.

[0028] An embodiment of this utility model provides a shuttle valve for a wind bag pump, comprising:

[0029] The housing has an internal cavity, and an air inlet port, a first gas port, a second gas port, a third gas port and a fourth gas port are provided through the side wall of the housing. The first gas port and the second gas port are respectively located on the axial outer side of the air inlet port, the third gas port is located on the axial outer side of the first gas port, and the fourth gas port is located on the axial outer side of the second gas port.

[0030] The slider moves axially within the cavity. The sidewall of the slider has a first annular groove and a second annular groove. The first annular groove is connected to a first gas port and moves axially with the slider to connect to an air inlet port or a third gas port. The second annular groove is connected to a second gas port and moves axially with the slider to connect to an air inlet port or a fourth gas port. The area of ​​the end faces of the first annular groove and the second annular groove that are far apart from each other is larger than the end faces that are close to each other.

[0031] During the operation of the airbag pump, the driving fluid released from the airbag to be contracted generates an axial force that holds the slider at its position. When the axial force generated by contraction is less than the axial force of the driving fluid, the slider moves in the other direction to the second position to complete the reversal. On the one hand, the driving fluid released from the airbag to be contracted needs to maintain a certain pressure to generate an axial force sufficient to hold the slider at its position, resulting in a lower flow rate of the released driving fluid and a longer contraction time for the airbag to be contracted. On the other hand, after the driving fluid inflates the airbag to be expanded to the required volume, it needs to generate a sufficient axial force to push the slider to move in the other direction to complete the reversal. The magnitude of the axial force determines the reversal speed, which depends on the fluid pressure and the area of ​​action, but the fluid pressure is difficult to increase. The action surface during the reversal process is always the far-away end faces of the first and second annular grooves. Therefore, when their areas are both larger than the close-away end faces, the axial force can be effectively increased, which can increase both the flow rate of the released driving fluid and the slider movement speed, achieving rapid reversal.

[0032] In some embodiments of this utility model, the depths of the first annular groove and the second annular groove decrease sequentially from the end faces that are far apart to the end faces that are close to each other.

[0033] In some embodiments of this utility model, a deepened annular groove is formed on the side of the end face of the first annular groove and the second annular groove that are far apart from each other.

[0034] In some embodiments of this utility model, the housing includes a cylindrical portion and a cover portion, wherein the cover portion seals the openings at both ends of the cylindrical portion.

[0035] In some embodiments of this utility model, the cover is provided with a through-hole gas reversing port.

[0036] In some embodiments of this utility model, a positioning rod is also included, one end of which is slidably connected to a positioning groove provided on the end face of the slider, and the other end is slidably connected to the cover.

[0037] To prevent friction between the slider and the inner wall of the housing, a certain gap is usually reserved between them. However, the presence of this gap may cause unnecessary circumferential rotation or offset of the slider. By setting a positioning rod, the slider can be guided to move axially, avoiding jamming caused by circumferential rotation or offset.

[0038] In some embodiments of this utility model, the positioning rod extends out of the cover and forms a sliding seal with the cover through an O-ring.

[0039] In some embodiments of this utility model, a pressing part is provided at one end of the positioning rod that is slidably connected to the positioning groove. The diameter of the pressing part is larger than that of the positioning rod. An annular rim is provided at the end face of the slider in the positioning groove. The inner diameter of the annular rim is larger than that of the positioning rod, and the inner diameter of the annular rim is smaller than that of the pressing part.

[0040] When the slider gets stuck, push or pull the positioning rod to make the pressing part of the positioning rod contact the bottom of the positioning groove or the edge of the ring, thereby moving the slider axially and restoring it to the normal working position.

[0041] In some embodiments of this utility model, the third gas port and the fourth gas port are respectively connected to a silencer exhaust valve.

[0042] An embodiment of this utility model provides a wind bag pump, including a pump body and a shuttle valve as described above.

[0043] To enable those skilled in the art to better understand the technical solution of this utility model, the technical solution of this utility model will be described in detail below with reference to specific embodiments.

[0044] Example 1

[0045] Shuttle valves used in airbag pumps, such as Figure 1 As shown, it includes:

[0046] The housing 1 has an internal cavity. An air inlet port 11, a first gas port 12, a second gas port 13, a third gas port 14, and a fourth gas port 15 are provided through the side wall of the housing 1. The first gas port 12 and the second gas port 13 are respectively located on the axial outer side of the air inlet port 11, the third gas port 14 is located on the axial outer side of the first gas port 12, and the fourth gas port 15 is located on the axial outer side of the second gas port 13.

[0047] Slider 2 moves axially within the cavity. A first annular groove 21 and a second annular groove 22 are formed on the sidewall of slider 2. The first annular groove 21 communicates with the first gas port 12 and, as slider 2 moves axially, communicates with the inlet port 11 or the third gas port 14. The second annular groove 22 communicates with the second gas port 13 and, as slider 2 moves axially, communicates with the inlet port 11 or the fourth gas port 15. The areas of the mutually distant end faces of the first annular groove 21 and the second annular groove 22 are both larger than the mutually approaching end faces. The depths of the first annular groove 21 and the second annular groove 22 decrease sequentially from the mutually distant end faces to the mutually approaching end faces.

[0048] When the first annular groove 21 is connected to the air inlet port 11 and the first gas port 12, and the second annular groove 22 is connected to the second gas port 13 and the fourth gas port 15, the first gas port 12 is connected to the air bag to be expanded, and the second gas port 13 is connected to the air bag to be contracted. At this time, the driving fluid in the first annular groove 21 enters from the air inlet port 11 and flows to the first gas port 12, while the driving fluid in the second annular groove 22 enters from the second gas port 13 and flows to the fourth gas port 15. Initially, the second annular groove 22 is filled with driving fluid, which generates a large axial force on the end face of the fourth gas port 15; while the driving fluid in the first annular groove 21 enters the air bag to be expanded through the first gas port, generating a smaller axial force on the end face of the first gas port 12. Under the action of these two opposing axial forces, the slider 2 remains in its position. As the airbag to be contracted contracts, the axial force in the second annular groove 22 decreases due to the decrease in driving fluid pressure, while the axial force in the first annular groove 21 increases as the airbag to be inflated expands. When the axial force in the first annular groove 21 is greater than the axial force in the second annular groove 22, the slider 2 moves axially to achieve reversal. In the above process, the axial force depends on the driving fluid pressure, which is limited by the external air source pressure and the pressure resistance of the airbag, making it difficult to increase. Therefore, simply increasing the area of ​​the mutually distant end faces of the first annular groove 21 and the second annular groove 22, i.e., the area of ​​the axial force application surface, can increase the axial force and avoid the decrease in driving fluid pressure caused by excessively large first annular grooves 21 and 22.

[0049] Example 2

[0050] Shuttle valves used in airbag pumps, such as Figure 2 As shown, it includes:

[0051] The housing 1 includes a cylindrical part 3 and a cover part 4. The cover part 4 seals the openings at both ends of the cylindrical part 3, forming an internal cavity. The side wall of the housing 1 is provided with an air inlet port 11, a first gas port 12, a second gas port 13, a third gas port 14, and a fourth gas port 15. The first gas port 12 and the second gas port 13 are respectively located on the axial outer side of the air inlet port 11, the third gas port 14 is located on the axial outer side of the first gas port 12, and the fourth gas port 15 is located on the axial outer side of the second gas port 13. The third gas port 14 and the fourth gas port 15 are respectively connected to a silencer exhaust valve (not shown).

[0052] Slider 2 moves axially within the cavity. A first annular groove 21 and a second annular groove 22 are formed on the sidewall of slider 2. The first annular groove 21 communicates with the first gas port 12 and, as slider 2 moves axially, communicates with the inlet port 11 or the third gas port 14. The second annular groove 22 communicates with the second gas port 13 and, as slider 2 moves axially, communicates with the inlet port 11 or the fourth gas port 15. The areas of the mutually distant end faces of the first annular groove 21 and the second annular groove 22 are both larger than the mutually close end faces. A deepened annular groove 23 is formed on one side of the mutually distant end faces of the first annular groove 21 and the second annular groove 22.

[0053] The positioning rod 5 has one end slidably connected to the positioning groove 6 provided on the end face of the slider 2, and the other end slidably connected to the cover 4. The positioning rod 5 extends out of the cover 4 and forms a sliding seal with the cover 4 through the O-ring 7. The end of the positioning rod 5 that is slidably connected to the positioning groove 6 is provided with a pressing part 51, the diameter of the pressing part 51 is larger than that of the positioning rod 5. The positioning groove 6 is provided with a circular edge 61 at the end face of the slider 2, the inner diameter of the circular edge 61 is larger than that of the positioning rod 5, and the inner diameter of the circular edge 61 is smaller than that of the pressing part 51.

[0054] When slider 2 is stuck, push the positioning rod 5 to make the extrusion part 51 contact the bottom of the positioning groove 6 and push slider 2, or pull the positioning rod 5 to make the extrusion part 51 contact the edge of the ring and pull slider 2, so that slider 2 returns to the normal working position.

[0055] Example 3

[0056] The airbag pump includes a pump body and the shuttle valve in Example 1.

[0057] Example 4

[0058] The airbag pump includes a pump body and the shuttle valve in Example 2.

[0059] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A shuttle valve for a pneumatic airbag pump, characterized in that, include: The housing has an internal cavity, and an air inlet port, a first gas port, a second gas port, a third gas port and a fourth gas port are provided through the side wall of the housing. The first gas port and the second gas port are respectively located on the axial outer side of the air inlet port, the third gas port is located on the axial outer side of the first gas port, and the fourth gas port is located on the axial outer side of the second gas port. The slider moves axially within the cavity. The sidewall of the slider has a first annular groove and a second annular groove. The first annular groove is connected to a first gas port and moves axially with the slider to connect to an air inlet port or a third gas port. The second annular groove is connected to a second gas port and moves axially with the slider to connect to an air inlet port or a fourth gas port. The area of ​​the end faces of the first annular groove and the second annular groove that are far apart from each other is larger than the end faces that are close to each other.

2. The shuttle valve as described in claim 1, characterized in that, The depths of the first and second annular grooves decrease sequentially from the end faces that are far apart to the end faces that are close to each other.

3. The shuttle valve as described in claim 1, characterized in that, A deeper annular groove is formed on one side of the end face of the first annular groove and the second annular groove that are far apart from each other.

4. The shuttle valve as described in claim 1, characterized in that, The housing includes a cylindrical portion and a cover portion, the cover portion sealing the openings at both ends of the cylindrical portion.

5. The shuttle valve as described in claim 4, characterized in that, The cover is provided with a through-hole gas reversing port.

6. The shuttle valve as described in claim 4, characterized in that, It also includes a positioning rod, one end of which is slidably connected to a positioning groove provided on the end face of the slider, and the other end is slidably connected to the cover.

7. The shuttle valve as described in claim 6, characterized in that, The positioning rod extends out of the cover and forms a sliding seal with the cover through an O-ring.

8. The shuttle valve as described in claim 7, characterized in that, One end of the positioning rod that is slidably connected to the positioning groove is provided with a pressing part. The diameter of the pressing part is larger than that of the positioning rod. The positioning groove is provided with a circular edge at the end face of the slider. The inner diameter of the circular edge is larger than that of the positioning rod, and the inner diameter of the circular edge is smaller than that of the pressing part.

9. The shuttle valve as claimed in claim 1, characterized in that, The third gas port and the fourth gas port are respectively connected to the silencer exhaust valve.

10. A wind-bag pump, characterized in that, It includes a pump body and a shuttle valve as described in any one of claims 1 to 9.

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