Novel flow-adjustable air bag pump

Abstract

The utility model belongs to the technical field of liquid delivery pumps, and particularly relates to a novel flow-adjustable air bag pump, which comprises air bags and a pump body, a valve plate is arranged in the center of the pump body, the pump body is divided into a left chamber and a right chamber by the valve plate, the air bags are arranged in the left chamber and the right chamber, and threaded end pipes are respectively arranged at the outer ends of the left chamber and the right chamber of the pump body. An end cover is arranged on the threaded end pipe, an abutting part is arranged in the air bag, the two sides of the abutting part are connected with a rod body and the front end of the air bag correspondingly, the rod body penetrates through an inner cavity of the air bag, the end cover is connected with a nut, scale marks are arranged on the rod body, and the air bag pump can accurately adjust the flow and also avoid the problem that liquid is polluted by impurities generated on the inner wall of the air bag.

Description

Technical Field

[0001] This utility model belongs to the field of liquid transfer pump technology, specifically relating to a novel adjustable flow rate airbag pump. Background Technology

[0002] In the semiconductor industry, pumps such as air-cushion pumps are commonly needed for transporting highly corrosive liquids like acids and alkalis. Air-cushion pumps are indispensable equipment in the semiconductor manufacturing supply chain and can also be used to transport high-purity fluids in other fields. An air-cushion pump uses compressed air as power and relies on a variable-volume air-cushion within the pump cylinder to alternately increase and decrease its working volume to transport special liquids. The pump chamber of the air-cushion pump is divided 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 air-cushion deforms and moves. A reversing valve controls the compressed air to sequentially enter 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.

[0003] A pneumatic pump can adjust both output pressure and flow rate by regulating the power source pressure when delivering liquids, and these two changes simultaneously. However, its flow control accuracy is very low, which cannot meet the requirements of some applications with high flow accuracy requirements. Furthermore, during the operation of the pneumatic pump, the bellows on the pneumatic bladder needs to constantly peristalse, and plastic particles are prone to detaching from the inner wall of the bellows. These detached plastic particles mix into the delivered liquid, leading to contamination and a decrease in purity. Patent application No. 2022106324865 discloses a pneumatic pump with precise flow control. This prior art pneumatic pump controls the expansion and contraction of the liquid container by controlling pressure and speed changes, achieving controllable liquid output. It is suitable for delivering liquids with flow rates from tens to hundreds of milliliters. However, this pneumatic pump suffers from low flow control accuracy in controlling the liquid output flow rate by adjusting pressure and speed changes, making it unable to precisely increase or decrease the delivered liquid flow rate quantitatively, thus hindering its application in environments with high flow accuracy requirements. Patent application No. 2023101223769 discloses a windbag pump with adjustable flow rate. The pump uses a guide rod to hold the adjusting component at the end away from the bellows body to limit the lateral outward expansion of the bellows body, thereby controlling the expansion volume of the bellows body and adjusting the volume of the bellows body. This allows the windbag pump to accurately increase or decrease the flow rate of the transported liquid. However, since the transported fluid (liquid) is temporarily stored in the bellows body, it is still impossible to avoid the problem that plastic particles can easily fall off the inner wall of the bellows and mix into the transported liquid. Utility Model Content

[0004] To address the aforementioned issues, this invention proposes a novel adjustable flow rate airbag pump. This airbag pump can precisely adjust the flow rate while avoiding the problem of impurities falling off the inner wall of the airbag contaminating the liquid.

[0005] The technical solution of this utility model is as follows:

[0006] A novel adjustable flow rate airbag pump includes an airbag and a pump body. A valve plate is provided in the center of the pump body, which divides the pump body into a left chamber and a right chamber. An airbag is provided in both the left and right chambers. Threaded end tubes are provided at the outer ends of the left and right chambers of the pump body, and end caps are provided on the threaded end tubes. An abutment component is provided inside the airbag. A rod is connected to the front end of the airbag on both sides of the abutment component. The rod passes through the inner cavity of the airbag and the end cap is connected to a nut. Scale lines are provided on the rod.

[0007] Preferably, the abutment component connects two rods, making it easier to control the expansion size of the airbag.

[0008] More preferably, the rod body is disposed around the air outlet.

[0009] Preferably, the diameter of the contacting component is greater than or equal to the diameter of the drive column, which is more conducive to controlling the degree of airbag inflation.

[0010] Preferably, the diameter of the contacting component is equal to the diameter of the inner wall of the front end of the airbag.

[0011] Preferably, a sealing element is provided between the rod and the end cap to prevent gas in the airbag cavity from leaking out through the gap between the rod and the end cap.

[0012] Preferably, a plane is provided on the outer circumferential side of the end of the rod away from the abutting part. The plane is used to set the scale lines. The purpose of setting the plane is mainly to facilitate the setting of the scale lines.

[0013] Preferably, an air inlet is provided on the end cap, and the air inlet and air outlet of the end cap are connected to the cavity inside the ventilation bag. The air inlet is for delivering compressed air into the cavity of the ventilation bag, and the air outlet is for discharging the compressed air from the cavity of the ventilation bag.

[0014] The windbag pump provided by this utility model, by setting up a rod, nut, and abutment component, can control the degree of expansion and compression of the windbag, thereby controlling the flow rate of the fluid (liquid). The windbag in one chamber expands until the nut controls it to expand no further, and the drive column moves to the other chamber, thereby squeezing the windbag in the other chamber. The degree of expansion and compression of the windbag can be determined by the movement position of the rod, thereby determining the liquid flow rate. Because there are scale lines on the rod, the changes in the expansion and compression of the windbag can be accurately controlled by moving the position of the nut, achieving precise quantitative increase or decrease in the flow rate of the delivered liquid. Since there are two rods, each with a nut, the expansion and compression of the windbag can be better controlled. Moreover, this windbag pump places the liquid on the outside of the windbag, not inside it. Placing the rod and abutment component inside the windbag effectively avoids the problem of plastic particles easily falling off the inner wall (corrugated pipe) of the windbag and mixing with the delivered liquid.

[0015] This utility model provides a novel adjustable flow rate airbag pump. The airbag pump has a simple structure and is easy to install and maintain. Through the rod, the abutment component and the nut, the degree of expansion and compression of the airbag is precisely controlled, effectively controlling the flow rate of the liquid. The rod and the abutment component are set inside the airbag to avoid direct contact with the liquid and the generation of impurities during long-term reciprocating motion. The liquid is placed on the outside of the airbag, avoiding the problem of impurities from the inner wall of the airbag contaminating the fluid. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the threaded end of the rod body in this utility model;

[0018] In the diagram, 1 is the rod, 2 is the nut, 3 is the abutment part, 4 is the drive column, 5 is the pump body, 6 is the threaded end pipe, 7 is the air bag, 8 is the end cover, 9 is the seal, 10 is the air inlet, and 11 is the air outlet. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection claimed in this application.

[0020] like Figure 1As shown, this utility model provides a novel adjustable flow rate airbag pump, including an airbag 7 and a pump body 5. A valve plate is located in the center of the pump body 5, dividing the pump body 5 into a left chamber and a right chamber. An airbag 7 is installed in both the left and right chambers. A drive column 4 is installed inside the valve plate, with its two ends movably connected to the front ends of the airbags 7 in the left and right chambers, respectively. Threaded end pipes 6 are respectively installed at the outer ends of the left and right chambers of the pump body 5, with end caps 8 on the threaded end pipes 6. A threaded end tube 6 and an end cap 8 are provided at the end. The end cap 8 fixes and presses the end of the air bag 7 tightly. An abutment component 3 is provided inside the air bag 7. The two sides of the abutment component 3 are respectively connected to the rod body 1 and the front end of the air bag 7. The rod body 1 passes through the inner cavity of the air bag 7 and is connected to the end cap 8 and nut 2. The nut 2 is provided on the end of the rod body 1 away from the abutment component 3. The rod body 1 and nut 2 are threadedly connected. The maximum diameter of the nut 2 is greater than the diameter of the gap through which the rod body 1 passes through the end cap 8, and scale lines are provided on the rod body 1.

[0021] In another embodiment, the abutting component 3 connects two rods 1, which make it easier to control the degree of expansion and compression of the airbag 7; the rods 1 are arranged around the air outlet 11; the end cap 8 is provided with an air inlet and an air outlet, and the air inlet 10 and the air outlet 11 of the end cap 8 are connected to the cavity of the airbag 7. The air inlet 10 is used to deliver compressed air into the cavity of the airbag 7, and the air outlet 11 is used to discharge the compressed air in the cavity of the airbag 7. The air inlet 10 and the air outlet 11 are respectively connected to a switch valve, which can be an electric valve or a magnetic valve. The switch valve can be connected to the outside air to control the intake or exhaust of air into the airbag 7.

[0022] In another embodiment, the diameter of the abutment component 3 is greater than or equal to the diameter of the drive column 4, which is more conducive to controlling the degree of expansion of the airbag 7.

[0023] In another embodiment, the diameter of the abutment component 3 is equal to the diameter of the inner wall of the front end of the airbag 7.

[0024] In another embodiment, a seal 9 is provided between the rod 1 and the end cap 8 to prevent gas in the cavity of the air bag 7 from escaping through the gap between the rod 1 and the end cap 8. The seal 9 can be a rubber sealing ring or other existing sealing devices suitable for reciprocating shaft movement, as long as it can guarantee the sealing effect and allow the rod 1 to move laterally. The length of the rod 1 is greater than the distance between the end cap 8 away from the abutting part 3 and the valve plate minus the thickness of the front end of the air bag 7, and the distance between the threaded end of the rod 1 near the abutting part 3 and the valve plate is greater than or equal to the distance between the end of the seal 9 away from the abutting part 3 and the valve plate.

[0025] In another embodiment, a plane is provided on the circumferential outer side of the end of the rod 1 away from the abutting member 3, such as... Figure 2As shown, the plane is used to set the scale lines. The purpose of setting the plane is mainly to facilitate the setting of the scale lines.

[0026] In another embodiment, the front end of the abutting component 3 and the air bag 7 are connected by other existing technologies such as bonding or integral molding, and the abutting component 3 and the connecting rod 1 are connected by other existing technologies such as bonding, snap-fitting or integral molding.

[0027] Working principle: By adopting the above technical solution, compressed air is introduced into the airbag 7 cavity in the left chamber through the air inlet 10. The airbag 7 expands, driving the drive column 4 at the front end of the airbag 7 to move to the right chamber. The drive column 4 compresses the airbag 7 in the right chamber, compressing the airbag 7. The compressed air in the airbag 7 is discharged through the air outlet 11. The expansion and compression of the airbag 7 are controlled through the air outlet 11, the air inlet 10, and the drive column 4, thereby controlling the liquid delivery of the airbag 7 pump. The expansion process of the right chamber is the same as above. By setting a rod 1 and abutment component 3 inside the airbag 7, and setting a nut 2 and scale lines on the rod 1, the expansion and compression of the airbag 7 can be limited by the position of the nut 2. The degree of expansion and compression of the airbag 7 in the left chamber is controlled, thereby controlling the flow rate of the liquid. For example, after the airbag 7 in the left chamber expands to a certain extent, the nut 2 will restrict the rod 1 from moving to the right, thereby controlling the abutment part 3 and the front end of the airbag 7 to move to the right, and finally restricting the drive column 4 from moving to the right, thus restricting the compression of the airbag 7 in the right chamber. The airbag 7 stops compressing, the liquid in the left chamber is discharged, and the liquid in the right chamber is drawn in. The expansion process of the airbag 7 in the right chamber is as described above. This process repeats itself. According to actual needs, the nut 2 is adjusted according to the scale line. The nut 2 limits the movement distance of the rod 1, thereby controlling the movement distance of the abutment part 3, and precisely controlling the degree of expansion and compression of the airbag 7, thereby precisely controlling the flow rate of the delivered liquid.

[0028] The wind bag pump provided by this utility model, by setting up a rod 1, a nut 2, and abutment parts 3, can control the degree of expansion and compression of the wind bag 7, thereby controlling the flow rate of the fluid (liquid). The wind bag 7 in one chamber expands until the nut 2 controls it to expand no further, at which point the drive column 4 moves to the other chamber, thus compressing the wind bag 7 in the other chamber. The degree of expansion and compression of the wind bag can be determined by the movement position of the rod 1, thereby determining the liquid flow rate. Because the rod 1 is equipped with scale lines, the degree of expansion and compression of the wind bag 7 can be accurately controlled by moving the position of the nut 2, achieving precise control. The flow rate of the transported liquid can be quantitatively increased or decreased. Because two rods 1 are installed, each with a nut 2, the expansion and compression of the airbag 7 can be better controlled. Furthermore, this airbag 7 pump places the liquid outside the airbag 7, not inside it. The rods 1 and the contacting component 3 are placed inside the airbag 7, effectively preventing plastic particles from easily falling off the inner wall of the airbag 7. These falling plastic particles would mix with the transported liquid, affecting its purity. Because impurities generated on the inner wall of the airbag 7 only fall into the airbag 7 and do not come into contact with the liquid, thus not affecting its purity.

[0029] This utility model provides a novel adjustable flow rate airbag pump. The airbag pump has a simple structure and is easy to install and maintain. The expansion and compression of the airbag 7 can be precisely controlled through the rod 1, the abutment part 3, and the nut 2, effectively controlling the flow rate of the liquid. The rod 1 and the abutment part 3 are located inside the airbag 7, avoiding direct contact with the liquid and preventing the generation of impurities during long-term reciprocating motion. The liquid is placed on the outside of the airbag 7, avoiding the problem of impurities contaminating the fluid on the inner wall of the airbag 7.

Claims

1. A novel adjustable flow rate airbag pump, comprising an airbag (7) and a pump body (5), wherein a valve plate is provided in the center of the pump body (5), and the pump body (5) is divided into a left chamber and a right chamber by the valve plate, wherein an airbag (7) is provided in both the left and right chambers, and threaded end pipes (6) are respectively provided at the outer ends of the left and right chambers of the pump body (5), and end caps (8) are provided on the threaded end pipes (6), characterized in that: The air bag (7) is provided with an abutment component (3). The two sides of the abutment component (3) are respectively connected to the rod body (1) and the front end of the air bag (7). The rod body (1) passes through the cavity inside the air bag (7), the end cap (8) and the nut (2), and the rod body (1) is provided with scale lines.

2. The novel adjustable flow rate airbag pump according to claim 1, characterized in that: The abutting component (3) connects the two rods (1).

3. The novel adjustable flow rate airbag pump according to claim 2, characterized in that: The rod (1) is arranged around the air outlet (11).

4. The novel adjustable flow rate airbag pump according to claim 1, characterized in that: The diameter of the abutting component (3) is greater than or equal to the diameter of the drive column (4).

5. A novel adjustable flow rate airbag pump according to claim 1, characterized in that: The diameter of the abutting component (3) is equal to the diameter of the inner wall of the front end of the air bag (7).

6. The novel adjustable flow rate airbag pump according to claim 1, characterized in that: A sealing element (9) is provided between the rod (1) and the end cap (8).

7. A novel adjustable flow rate airbag pump according to claim 1, characterized in that: A plane is provided on the outer circumferential side of the end of the rod (1) away from the abutting part (3), and scale lines are provided on the plane.

8. The novel adjustable flow rate airbag pump according to claim 1, characterized in that: An air inlet (10) is provided on the end cap (8).

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