Air bag connecting assembly 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 an air bag connecting assembly and an air bag pump. The air bag connecting assembly comprises a sliding rod and a hollow cylinder barrel, the sliding rod penetrates through the hollow cylinder barrel and is in sliding connection with the two end faces of the hollow cylinder barrel, a cavity is formed between the side wall of the sliding rod and the inner wall of the hollow cylinder barrel, and sealing pieces are arranged on the side walls of the two ends of the sliding rod. The air bag connecting assembly can reduce friction on one hand and can prevent particles generated by friction from overflowing on the other hand. By arranging the sealing piece on the sliding rod, on one hand, particles can be prevented from overflowing into the liquid working cavity, and on the other hand, pump efficiency reduction caused by liquid channeling on the two sides of the air bag connecting assembly can be avoided.

Description

Technical Field

[0001] This utility model belongs to the field of wind bag pump technology, specifically relating to a wind bag connecting component and a wind bag pump. 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] The airbag pump uses compressed air as its power source. A reversing valve controls the compressed air to sequentially enter two gas-phase working chambers. The alternating suction and discharge of liquid in the liquid-phase chamber achieves liquid transport. Two airbags divide the pump chamber into two working chambers, each consisting of a gas-phase working chamber and a liquid-phase working chamber. After compressed air enters the gas-phase working chamber, the compressed airbags deform and reciprocate. The reversing valve controls the sequential entry of compressed air into the two gas-phase working chambers. The alternating suction and discharge of liquid in the liquid-phase working chamber achieves the transport of the liquid medium.

[0004] A connecting rod is mounted and slidably connected to the pump body of a windbag pump to connect two windbags. During operation, when one windbag extends, the connecting rod compresses the other windbag, thereby enabling separate liquid intake and discharge in the two liquid phase working chambers. However, the connecting rod rubs against the pump body during its reciprocating motion, and the resulting debris and particles can enter the liquid working chamber and contaminate the liquid. CN 220687560 U discloses a central shaft assembly, including a central shaft and an isolation member. The isolation member is disposed on at least a portion of the outer wall of the central shaft to isolate the central shaft from the liquid chamber of the windbag pump, forming a barrier on the outer wall of the central shaft to separate the central shaft from the liquid, preventing particles generated by friction from entering the liquid chamber and effectively avoiding contamination of the liquid, making it suitable for the delivery of ultrapure chemical liquids. Although this patent avoids contaminating the liquid by using an isolation member to prevent particles generated by friction from entering the liquid chamber, it does not fundamentally solve the problem of friction between the central shaft and the pump body. Furthermore, the retractable isolation element in this patent forms an isolation cavity in the liquid medicine chamber, which also compresses the effective volume of the liquid medicine chamber to a certain extent. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a wind bag connecting assembly and a wind bag pump. Addressing the technical problem of particles generated by friction during the reciprocating motion of the connecting rod contaminating the transported liquid, this invention provides a wind bag connecting assembly comprising a sliding rod and a hollow cylinder, replacing the connecting rod in a traditional wind bag pump. The friction area between the sliding rod and the hollow cylinder is significantly reduced, and the hollow cylinder can act as a container for collecting friction particles, reducing friction while preventing particle leakage.

[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 wind bag connecting assembly for a wind bag pump, including a sliding rod and a hollow cylinder. The sliding rod is disposed through the hollow cylinder and slidably connected to both ends of the hollow cylinder. A cavity is formed between the side wall of the sliding rod and the inner wall of the hollow cylinder. Sealing elements are provided on the side walls at both ends of the sliding rod.

[0008] The airbag connecting assembly includes a sliding rod and a hollow cylinder. The hollow cylinder is fixedly connected to the pump body and slidably connected to the sliding rod, providing sliding fixation and limiting for the sliding rod. The sliding rod passes through the hollow cylinder and slidably connects to the end face of the hollow cylinder. The diameter of the sliding rod is smaller than the inner diameter of the hollow cylinder, creating a cavity between the side wall of the sliding rod and the inner wall of the hollow cylinder. When the sliding rod reciprocates with the deformation of the airbag, it only rubs against the hollow cylinder at its two end faces, significantly reducing the friction area. Simultaneously, the hollow cylinder acts as a container for collecting friction particles, preventing them from overflowing into the liquid working chamber along with the sealing element. Therefore, the airbag connecting assembly of this invention reduces friction and prevents the overflow of friction-generated particles. Furthermore, by providing a sealing element on the sliding rod, it prevents particles from overflowing into the liquid working chamber and avoids a decrease in pump efficiency caused by liquid cross-contamination on both sides of the airbag connecting assembly.

[0009] Preferably, the sealing element is fixedly connected to the end face of the hollow cylinder and slidably or fixedly connected to the side of the sliding rod.

[0010] The function of the seal is to seal the gap at the sliding connection between the sliding rod and the hollow cylinder without hindering the reciprocating movement of the sliding rod. To ensure sealing efficiency, the seal is connected to both the hollow cylinder and the sliding rod. Based on whether the seal matches the movement of the sliding rod while maintaining a seal, the connection method between the seal and the sliding rod is divided into sliding connection and fixed connection. If the seal cannot maintain a seal due to displacement or deformation, it is fixed to the hollow cylinder and slidably connected to the sliding rod. The sliding rod slides within this type of seal, resulting in a relatively weak sealing effect. If the seal can maintain a seal even when deformed or displaced, it is fixed to the sliding rod, utilizing its deformation or displacement capabilities to maintain a sealing effect under different movement states of the sliding rod.

[0011] More preferably, when the seal is slidably connected to the side of the sliding rod, the seal includes a sealing ring or a sealing baffle.

[0012] If the sealing ring or sealing baffle is displaced or deformed, it cannot maintain the sealing effect. Therefore, it can be slidably connected to the sliding rod and fixed in the hollow cylinder to remain stationary.

[0013] More preferably, when the seal is fixedly connected to the side of the sliding rod, the seal includes a bellows or a flexible membrane.

[0014] The bellows or flexible membrane possess a certain degree of deformation capability, allowing them to expand, contract, or fold with the reciprocating movement of the sliding rod without hindering its normal function. Connecting these deformable sealing elements, such as bellows or flexible membranes, to the hollow cylinder and sliding rod respectively creates a sealed space, effectively sealing the gap at the sliding connection between the sliding rod and the hollow cylinder, resulting in superior sealing performance. Furthermore, the size of the sealing element and its fit with the sliding rod can be minimized while still ensuring sealing and sliding, reducing the volume encroachment on the liquid phase working chamber.

[0015] More preferably, the sealing element is fixedly connected to the end face of the hollow cylinder and the side of the sliding rod by means of fixing elements.

[0016] Secure the seal with fasteners to prevent it from failing due to displacement or detachment.

[0017] Preferably, a positioning element is provided on the side wall of the sliding rod, and the positioning element is slidably connected to the inner wall of the hollow cylinder.

[0018] Since the sliding rod is only slidably connected to the central control cylinder at the through holes on its two end faces, it may deviate to some extent during reciprocating motion, affecting operating efficiency and pumping flow. Positioning components can be used to position the sliding rod and limit its deviation during sliding. The positioning components can be ring-shaped or a composite structure formed by multiple positioning rods.

[0019] More preferably, the inner wall of the hollow cylinder is provided with a positioning groove that is slidably connected to the positioning element.

[0020] The positioning groove can prevent the positioning components, especially the positioning rod, from shifting. At the same time, it can axially limit the movement of the sliding rod, preventing its axial displacement from deviating and causing adverse effects such as collision with the wind bag wall.

[0021] Preferably, airbag connectors are provided at both ends of the sliding rod, and the airbag connectors are fixedly connected or abuttingly connected to the airbag in the airbag pump.

[0022] The connection between the airbag connector and the airbag can be adjusted according to actual needs. When radial fixation of the sliding rod is required, a snap-fit ​​structure or other airbag connector can be used to fix the sliding rod to the airbag wall. Alternatively, a retaining connection can be achieved by using a contact plate or other airbag connector, and the contact area can be adjusted to improve the pushing effect of the airbag on the sliding rod.

[0023] Preferably, the sliding rod coincides with the central axis of symmetry of the hollow cylinder.

[0024] Secondly, this utility model provides a wind bag pump, including a wind bag, a pump body and a wind bag connecting assembly as described in the first aspect. Two wind bags are provided and are respectively disposed on both sides of the pump body. The wind bag connecting assembly is sandwiched between the two wind bags, and the hollow cylinder of the wind bag connecting assembly is fixedly connected to the pump body.

[0025] The beneficial effects achieved by one or more technical solutions of this utility model are as follows:

[0026] The airbag connection assembly can reduce friction on the one hand, and prevent the leakage of particles generated by friction on the other hand.

[0027] As the sliding rod reciprocates with the deformation of the airbag, it only rubs against the hollow cylinder at both end faces, significantly reducing the friction area. Simultaneously, the hollow cylinder acts as a container for collecting friction particles, preventing them from overflowing into the liquid phase working chamber along with the seal.

[0028] By installing a seal on the sliding rod, it is possible to prevent particles from overflowing into the liquid working chamber, and also to avoid a decrease in pump efficiency caused by liquid cross-contamination on both sides of the air bag connecting assembly. Attached Figure Description

[0029] 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.

[0030] Figure 1 This is a cross-sectional view of the airbag connection assembly in Example 1;

[0031] Figure 2 This is a cross-sectional view of the airbag connection assembly in Example 2;

[0032] Figure 3 This is a cross-sectional view of the airbag connection assembly in Example 3;

[0033] Figure 4 This is a cross-sectional view of the airbag connection assembly in Example 4;

[0034] Figure 5 This is a partial cross-sectional view of the airbag pump in Example 5;

[0035] Figure 6 This is a partial cross-sectional view of the airbag pump in Example 6;

[0036] In the figure, 1 is the sliding rod, 2 is the hollow cylinder, 3 is the seal, 4 is the fixing part, 5 is the positioning part, 6 is the positioning groove, 7 is the air bag connector, 100 is the air bag connecting assembly, 200 is the air bag, and 300 is the pump body. Detailed Implementation

[0037] 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 and comparative examples.

[0038] Example 1

[0039] like Figure 1 As shown, the airbag connecting assembly 100 includes a sliding rod 1 and a hollow cylinder 2. The sliding rod 1 passes through the hollow cylinder 2 and is slidably connected to both end faces of the hollow cylinder 2. A cavity is formed between the side wall of the sliding rod 1 and the inner wall of the hollow cylinder 2. Sealing elements 3 are provided on the side walls at both ends of the sliding rod 1. The sealing elements 3 are sealing baffles, which are fixedly connected to the end faces of the hollow cylinder 2 and slidably connected to the side faces of the sliding rod 1.

[0040] Example 2

[0041] like Figure 2 As shown, the airbag connecting assembly 100 includes a sliding rod 1 and a hollow cylinder 2. The sliding rod 1 passes through the hollow cylinder 2 and is slidably connected to both end faces of the hollow cylinder 2. A cavity is formed between the side wall of the sliding rod 1 and the inner wall of the hollow cylinder 2. Sealing elements 3 are provided on the side walls at both ends of the sliding rod 1. The sealing elements 3 are flexible membranes and are fixedly connected to the end faces of the hollow cylinder 2 and the side faces of the sliding rod 1 by fixing elements 4.

[0042] Example 3

[0043] like Figure 3 As shown, the airbag connecting assembly 100 includes a sliding rod 1 and a hollow cylinder 2. The sliding rod 1 passes through the hollow cylinder 2 and is slidably connected to both end faces of the hollow cylinder 2. A cavity is formed between the side wall of the sliding rod 1 and the inner wall of the hollow cylinder 2. Sealing elements 3 are provided on the side walls at both ends of the sliding rod 1. The sealing elements 3 are flexible membranes and are fixedly connected to the end faces of the hollow cylinder 2 and the side faces of the sliding rod 1 by fixing elements 4. A positioning element 5 is provided on the side wall of the sliding rod. The positioning element 5 is annular and is slidably connected to the inner wall of the hollow cylinder 1.

[0044] Example 4

[0045] like Figure 4As shown, the airbag connecting assembly 100 includes a sliding rod 1 and a hollow cylinder 2. The sliding rod 1 passes through the hollow cylinder 2 and is slidably connected to both end faces of the hollow cylinder 2. A cavity is formed between the side wall of the sliding rod 1 and the inner wall of the hollow cylinder 2. Sealing elements 3 are provided on the side walls at both ends of the sliding rod 1. The sealing elements 3 are flexible membranes and are fixedly connected to the end faces of the hollow cylinder 2 and the side faces of the sliding rod 1 by fixing elements 4. Positioning elements 5 are provided on the side walls of the sliding rod. The positioning elements 5 are composite structures consisting of four positioning rods arranged at an included angle of 90°. The positioning elements 5 are slidably connected to the positioning grooves 6 opened in the inner wall of the hollow cylinder 1.

[0046] Example 5

[0047] like Figure 5 As shown, the airbag pump includes an airbag 200, a pump body 300, and an airbag connecting assembly 100. There are two airbags 200, which are respectively located on both sides of the pump body 300. The airbag connecting assembly 100 is sandwiched between the two airbags 200. The hollow cylinder 2 of the airbag connecting assembly 100 is fixedly connected to the pump body 300.

[0048] The airbag connecting assembly 100 includes a sliding rod 1 and a hollow cylinder 2. The sliding rod 1 passes through the hollow cylinder 2 and is slidably connected to both end faces of the hollow cylinder 2. A cavity is formed between the side wall of the sliding rod 1 and the inner wall of the hollow cylinder 2. Sealing elements 3 are provided on the side walls at both ends of the sliding rod 1. The sealing elements 3 are flexible membranes and are fixedly connected to the end faces of the hollow cylinder 2 and the side faces of the sliding rod 1 by fixing elements 4. Positioning elements 5 are provided on the side walls of the sliding rod. The positioning elements 5 are composite structures consisting of four positioning rods arranged at an included angle of 90°. The positioning elements 5 are slidably connected to the positioning grooves 6 opened in the inner wall of the hollow cylinder 1. Airbag connecting elements 7 are provided at both ends of the sliding rod 1. The airbag connecting elements 7 are contact plates that abut against the airbag 200.

[0049] Example 6

[0050] like Figure 6 As shown, the airbag pump includes an airbag 200, a pump body 300, and an airbag connecting assembly 100. There are two airbags 200, which are respectively located on both sides of the pump body 300. The airbag connecting assembly 100 is sandwiched between the two airbags 200. The hollow cylinder 2 of the airbag connecting assembly 100 is fixedly connected to the pump body 300.

[0051] The airbag connecting assembly 100 includes a sliding rod 1 and a hollow cylinder 2. The sliding rod 1 passes through the hollow cylinder 2 and is slidably connected to both end faces of the hollow cylinder 2. A cavity is formed between the side wall of the sliding rod 1 and the inner wall of the hollow cylinder 2. Sealing elements 3 are provided on the side walls at both ends of the sliding rod 1. The sealing elements 3 are flexible membranes and are fixedly connected to the end faces of the hollow cylinder 2 and the side faces of the sliding rod 1 by fixing elements 4. Positioning elements 5 are provided on the side walls of the sliding rod. The positioning elements 5 are composite structures consisting of four positioning rods arranged at an included angle of 90°. The positioning elements 5 are slidably connected to the positioning grooves 6 opened in the inner wall of the hollow cylinder 1. Airbag connecting elements 7 are respectively provided at both ends of the sliding rod 1. The airbag connecting elements 7 are snap-fit ​​structures and are fixedly connected to the airbag 200.

[0052] 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 wind bag connecting assembly for a wind bag pump, characterized in that, It includes a sliding rod and a hollow cylinder. The sliding rod is disposed through the hollow cylinder and is slidably connected to both ends of the hollow cylinder. A cavity is formed between the side wall of the sliding rod and the inner wall of the hollow cylinder. Sealing elements are provided on the side walls at both ends of the sliding rod.

2. The airbag connecting assembly as described in claim 1, characterized in that, The sealing element is fixedly connected to the end face of the hollow cylinder and slidably or fixedly connected to the side of the sliding rod.

3. The airbag connecting assembly as described in claim 2, characterized in that, When the seal is slidably connected to the side of the sliding rod, the seal includes a sealing ring or a sealing baffle.

4. The airbag connecting assembly as described in claim 2, characterized in that, When the seal is fixedly connected to the side of the sliding rod, the seal includes a bellows or a flexible membrane.

5. The airbag connecting assembly as described in claim 2, characterized in that, The sealing element is fixedly connected to the end face of the hollow cylinder and the side of the sliding rod by fasteners.

6. The airbag connecting assembly as described in claim 1, characterized in that, The sliding rod has a positioning element on its side wall, and the positioning element is slidably connected to the inner wall of the hollow cylinder.

7. The wind bag connecting assembly as described in claim 6, characterized in that, The inner wall of the hollow cylinder is provided with a positioning groove that slides and connects with the positioning component.

8. The wind bag connecting assembly as described in claim 1, characterized in that, The sliding rod is provided with airbag connectors at both ends, and the airbag connectors are fixedly connected or abutted to the airbags in the airbag pump.

9. The wind bag connecting assembly as described in claim 1, characterized in that, The sliding rod coincides with the central axis of symmetry of the hollow cylinder.

10. A wind-bag pump, characterized in that, The device includes an air bag, a pump body, and an air bag connecting assembly as described in any one of claims 1 to 9. The air bag is provided in two parts and is respectively disposed on both sides of the pump body. The air bag connecting assembly is sandwiched between the two air bags, and the hollow cylinder of the air bag connecting assembly is fixedly connected to the pump body.

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