A self-starting bellows pump

Abstract

The present invention provides a self-priming bellows pump comprising: a first set of reversing components, a second set of reversing components, a third set of reversing components, and a bellows pump reversing component. The self-priming bellows pump of the present invention is entirely driven by compressed air, without the need for electrical drive. The pump's start and stop are controlled by the opening or closing of a valve at the liquid end of the delivery pipeline and the pressure of the driving air source, eliminating the need for a complex upper-level control system and reducing control costs. Furthermore, the unique structure simplifies the control structure of the entire liquid supply system, reduces failure rates, and improves the reliability of the liquid supply system.

Description

Technical Field

[0001] The present invention relates to the technical field of air bladder pumps, and in particular to a self-starting air bladder pump. Background Art

[0002] During the semiconductor manufacturing process, hazardous substances such as toxic substances, strong acids, and strong bases must be transferred from the factory side to the liquid supply side of the machine. The pipes, valves, fittings, and chemical pumps used in this transfer process must be reliably sealed and have a long service life. Currently, the bellows pumps used in semiconductor pipelines are controlled by a control system. A host computer or PLC (Programmable Logic Controller) receives control signals from the liquid supply side to start and stop the chemical pump. This complex control process increases costs and increases the risk of failure. Summary of the Invention

[0003] In order to solve the defects in the prior art, the present invention proposes a self-starting bellows pump.

[0004] A self-starting bellows pump comprises: a first set of reversing components, a second set of reversing components, a third set of reversing components and a bellows pump reversing component.

[0005] The first set of reversing components includes a first air inlet, a pressure-balancing air bag, a reversing rod, and a first air outlet. An air passage is provided between the first air inlet and the pressure-balancing air bag. The pressure-balancing air bag is fixedly connected to the head of the reversing rod. A fluid passage is provided between the head of the pressure-balancing air bag and the liquid outlet of the self-starting air bag pump.

[0006] The second group of reversing components includes a second air inlet, a reversing shaft, a movable slider, a valve core base, two second air outlets, a left piston end face and a right piston end face. A chamber is provided between the piston end face and the inner wall of the second group of reversing components, including a left chamber and a right chamber. The second air inlet is communicated with the first air outlet. The two second air outlets include a second left air outlet and a second right air outlet. The reversing shaft is pushed by the left piston end face or the right piston end face, thereby controlling the movable slider to move on the valve core base to cause the compressed air to reverse, and enter the left air bag of the reversing component of the air bag pump from the second left air outlet, or enter the right air bag of the reversing component of the air bag pump from the second right air outlet;

[0007] The third group of reversing components includes a third air inlet, an air path reversing shaft, a reversing shaft control component and two third air outlets, the third air inlet is connected to the first air outlet, the two third air outlets include a third left air outlet and a third right air outlet, the reversing shaft control component includes a moving rod and a left push plate and a right push plate fixed on both sides of the moving rod, when the moving rod moves left and right, it drives the left push plate or the right push plate to push the air path reversing shaft to move left and right, so that the compressed air flows out from the third left air outlet and acts on the left piston end surface of the second group of reversing components, or flows out from the third right air outlet and acts on the right piston end surface of the second group of reversing components;

[0008] The air bag pump reversing component includes a left air bag, a right air bag, a left pull plate and a right pull plate. The left air bag is fixedly connected to the left pull plate, the right air bag is fixedly connected to the right pull plate, and the left pull plate and the right pull plate are fixedly connected to the moving rod of the third group of reversing components. When compressed air enters the air bag pump reversing component to compress the right air bag, it drives the right pull plate to move to the left and then drives the moving rod to move to the left. When compressed air enters the air bag pump reversing component to compress the left air bag, it drives the left pull plate to move to the right and then drives the moving rod to move to the right.

[0009] Preferably, when the pressure-balancing air bag is in the initial state, the reversing rod is located in the closed position on the left side, and the first air inlet is not connected to the first air outlet; when the initial compressed air enters the first air inlet, the compressed air enters the pressure-balancing air bag through the air duct, and the pressure-balancing air bag drives the reversing rod to move to the connecting position on the right side, and the first air inlet is connected to the first air outlet, so that the compressed air flows out from the first air outlet.

[0010] Preferably, the steps of reversing the direction of the bellows pump are as follows:

[0011] Part of the compressed air flowing out of the first air outlet enters the second air inlet, and the other part enters the third air inlet;

[0012] The second group is reversed by moving the reversing shaft, thereby controlling the movable slider to move on the valve core base to cause the compressed air to reverse and enter the left air bag of the air bag pump reversing component through the second left air outlet;

[0013] When the compressed air compresses the left air bag, it drives the left pull plate to move rightward and then drives the moving rod to move rightward;

[0014] When the moving rod moves to the right, it drives the left push plate to push the air path reversing shaft to move to the right, causing the compressed air in the third group of reversing components to flow out from the third left air outlet and act on the left piston end surface of the second group of reversing components;

[0015] The left piston end face is pressurized to move the reversing shaft to the right, thereby driving the movable slider to move rightward on the valve core base to cause the compressed air to reverse direction and enter the right air bag of the air bag pump reversing component through the second right air outlet;

[0016] When the compressed air compresses the right air bag, it drives the right pull plate to move leftward and then drives the moving rod to move leftward;

[0017] When the moving rod moves to the left, it drives the right push plate to push the air path reversing shaft to move left, causing the compressed air to flow out from the third right air outlet and act on the right piston end face of the second group of reversing components.

[0018] Preferably, when the liquid pressure in the liquid outlet pipeline of the bellows pump is lower than the pressure of the compressed air, the bellows pump works normally, and compresses the medium inside the bellows reversing component by switching left and right, thereby achieving liquid discharge.

[0019] Preferably, when the pressure on the liquid outlet pipeline of the bellows pump is equal to the pressure of the compressed air, the two sides of the pressure-balancing bellows are in a balanced position, and the pressure-balancing bellows maintains its initial state, so that the reversing rod moves to the left to cut off the air source to the reversing component of the bellows pump, thereby stopping the bellows pump from working.

[0020] Preferably, when the liquid end valve is opened and the medium is discharged from the pipeline, so that the liquid pressure in the liquid outlet is reduced to less than the pressure of the compressed air, the pressure balancing bellows moves again, and the compressed air enters the air path of the bellows pump, so that the bellows pump starts to operate again.

[0021] Preferably, the second group of reversing components and the third group of reversing components are both provided with exhaust ports.

[0022] The present invention has the following beneficial effects:

[0023] The self-priming bellows pump of this invention is powered entirely by compressed air, eliminating the need for electricity. The pump's start and stop are controlled by the opening or closing of a valve at the liquid end of the delivery pipeline and the pressure of the driving air source, eliminating the need for a complex upper-level control system and reducing control costs. Furthermore, the unique structure simplifies the control structure of the entire liquid supply system, reducing failure rates and improving system reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the working principle of a self-starting bellows pump according to a preferred embodiment of the present invention.

[0025] Figure 2 It is a schematic diagram of the first group of reversing components of a self-starting bellows pump according to a preferred embodiment of the present invention.

[0026] Figure 3 It is a schematic diagram of the second group of reversing components of a self-starting bellows pump according to a preferred embodiment of the present invention.

[0027] Figure 4 It is a schematic diagram of the third group of reversing components and the reversing components of the bellows pump of a self-starting bellows pump according to a preferred embodiment of the present invention.

[0028] Figure 5 It is a structural diagram of a bellows pump reversing component of a self-starting bellows pump according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0029] The following will illustrate the implementation methods of the present invention in conjunction with the accompanying drawings. It should be noted that the implementation methods involved in this specification are not exhaustive and do not represent the only implementation methods of the present invention. The following corresponding embodiments are only for the purpose of clearly illustrating the invention content of the patent of this invention and are not intended to limit its implementation methods. For ordinary technicians in this field, different forms of changes and modifications can be made on the basis of the description of these embodiments. Any obvious changes or modifications that belong to the technical concept and invention content of the present invention are also within the scope of protection of the present invention.

[0030] Figure 1 The figure shows the working principle of a self-starting bellows pump of a preferred embodiment of the present invention. The self-starting bellows pump of the present invention comprises: a first group of reversing components 1, a second group of reversing components 2, a third group of reversing components 3 and a bellows pump reversing component 4. Figure 2-5 Describe each component in detail.

[0031] like Figure 2 As shown, the first set of reversing components 1 includes a first air inlet 11, a pressure-balancing air bag 14, a reversing rod 13, and a first air outlet 15. An air passage 12 is defined between the first air inlet 11 and the pressure-balancing air bag 14. The pressure-balancing air bag 14 sleeve is fixedly connected to the head of the reversing rod 13 via a threaded connection. The head of the pressure-balancing air bag 14 is in fluid communication with the liquid outlet 41 in the air bag pump reversing component 4. Specifically, the head of the pressure-balancing air bag 14 is connected to the reversing rod 13, and the tail of the pressure-balancing air bag 14 is fixed to the inner wall of the first set of reversing components 1. The reversing rod 13 moves back and forth within the inner cavity of the first set of reversing components 1 as the pressure-balancing air bag 14 expands and contracts.

[0032] like Figure 3 As shown, the second set of reversing components includes a second air inlet 21, a reversing shaft (piston) 22, a movable slider 23, a valve core base 24, two second air outlets 25, a second exhaust port 28, a left piston end face 26, and a right piston end face 27. A left chamber 261 is defined between the left piston end face 26 and the left inner wall of the second set of reversing components 2, and a right chamber 271 is defined between the right piston end face 27 and the right inner wall of the second set of reversing components 2. The second air inlet 21 is connected to the first air outlet 15, and the two second air outlets 25 include a second left air outlet 251 and a second right air outlet 252. The reversing shaft (piston) 22 is pushed by the left piston end face 26 or the right piston end face 27, thereby controlling the movable slider 23 to move on the valve core base 24 to cause the compressed air to reverse direction. Compressed air enters the bellows pump reversing component 4 through the second left air outlet 251 to compress the left air bag 45, or enters the bellows pump reversing component 4 through the second right air outlet 252 to compress the right air bag 46. Preferably, the movable slider 23 is fixedly slidable on the valve core base 24 following the reversing shaft (piston) 22, and the size of the movable slider 23 matches the second air outlet 25. When slid into place, it simultaneously blocks the second exhaust port 28 and either of the second air outlets 251 and 252 on either side.

[0033] like Figure 4 As shown, the third set of reversing components 3 includes a third air inlet 31, an air path reversing shaft 33, a reversing shaft control component 34, and two third air outlets 32. The third air inlet 31 is connected to the first air outlet 15 in the first set of reversing components 1. The two third air outlets 32 include a third left air outlet 321 and a third right air outlet 322. The reversing shaft control component 34 includes a moving rod 342 and a left push plate 341 and a right push plate 343 fixed to either side of the moving rod 342. When the moving rod 342 moves to the left, it drives the right push plate 343 to push the air path reversing shaft 33 to the left, causing the compressed air to flow out from the third left air outlet 321 and act on the left piston end face 26 of the second group of reversing components 2; when the moving rod 342 moves to the right, it drives the left push plate 341 to push the air path reversing shaft 33 to the right, causing the compressed air to flow out from the third right air outlet 322 and act on the right piston end face 27 of the second group of reversing components 2.

[0034] Preferably, the third air inlet 31 and the two third air outlets 32 are located at the upper end of the third set of reversing components 3, with the third air inlet 31 located between the two third air outlets 32. The air path reversing shaft 33 moves left and right within the inner cavity of the third set of reversing components 3. A plurality of recesses are provided on the side of the air path reversing shaft 33 opposite the third air inlet 31 and the two third air outlets 32. When the air path reversing shaft 33 is moved into position, one of the recesses can simultaneously connect the third air inlet 31 with either of the two third air outlets 32.

[0035] Preferably, the third left air outlet 321 in the third group of reversing components 3 is connected to the left piston end face 26 in the second group of reversing components 2, so that when the compressed air flows out from the third left air outlet 321, the left piston end face 26 is pushed to the right; the third right air outlet 322 in the third group of reversing components 3 is connected to the right piston end face 27 in the second group of reversing components 2, so that when the compressed air flows out from the third right air outlet 321, the right piston end face 27 is pushed to the left.

[0036] like Figure 4-5 As shown, the air bag pump reversing component 4 includes a liquid outlet 41, a liquid inlet 42, a left air bag 45, a right air bag 46, a left pull plate 43 and a right pull plate 44. Among them, the left pull plate 43 and the right pull plate 44 are fixedly connected to the moving rod 342 of the reversing shaft control component 34 of the third group of reversing components 3 in a threaded manner. The left pull plate 43 is fixedly connected to the left air bag 45 by a pin 47, and the right pull plate 44 is also fixedly connected to the right air bag 46 by a pin, thereby realizing the synchronization of air bag compression / expansion and pull plate movement. The air bag is located in the air bag pump housing 48. When compressed air enters the air bag pump housing 48, it will generate pressure on the air bag, causing the air bag to be compressed. As shown Figure 5 As shown, the right wind bag 46 is in a compressed state, and the left wind bag 45 is in an expanded state. The liquid outlet 41 and the liquid inlet 42 are fixedly connected to the left wind bag 45 and the right wind bag 46 respectively by means of threads. When compressed air enters the wind bag pump reversing component 4 and compresses the right wind bag 46, it drives the right pull plate 44 to move left, which in turn drives the moving rod 342 to move to the left, while also driving the left pull plate 43 to move left, thereby pulling the left wind bag 45 to expand. When compressed air enters the wind bag pump reversing component 4 and compresses the left wind bag 45, it drives the left pull plate 43 to move right, which in turn drives the moving rod 342 to move to the right, while also driving the right pull plate 44 to move right, thereby pulling the right wind bag 46 to expand.

[0037] In addition, both the second and third reversing components 2 and 3 are equipped with exhaust ports, including the second exhaust port 28 in the second reversing component 2 and two third exhaust ports 35 (i.e., the third left exhaust port 351 and the third right exhaust port 352) in the third reversing component 3. The exhaust ports are used to exhaust gas when the bellows pump reversing component 4 switches left and right, and when the second reversing component 2 switches left and right. For example, when the air path reversing shaft 33 of the third group of reversing components 3 moves to the left and into position, the third air inlet 31 is connected to the third left air outlet 321, providing pressure for the left chamber 261 of the second group of reversing components 2, pushing the reversing shaft (piston) 22 of the second group of reversing components 2 to move to the right, and the gas in the right chamber 271 of the second reversing component 2 is compressed and enters the third group of reversing components 3 through the original air inlet path through the third right air outlet 322, and is discharged from the wind bag pump through the third right exhaust port 352 (at this time, the recess of the air path reversing shaft 33 connects the third right air outlet 322 with the third right exhaust port 352). Furthermore, when the air path reversing shaft 33 of the third group reversing component 3 moves rightward into position, the right side air bag 46 in the air bag pump reversing component 4 expands, squeezing the gas out, and the gas is discharged from the air bag pump via the second right side air outlet 252 and the second exhaust port 28 along the original air inlet path (at this time, the position of the valve core base 24 connects the second right side air outlet 252 and the second exhaust port 28). When the air path reversing shaft 33 moves leftward into position, the gas in the left side chamber 261 of the second group reversing component 2 is also discharged via the original air inlet path via the third left side air outlet 321 to the third left side exhaust port 351 (at this time, the recess of the air path reversing shaft 33 connects the third left side air outlet 321 and the third left side exhaust port 351). Furthermore, the gas in the left side air bag 45 of the air bag pump reversing component 4 is also discharged via the original air inlet path via the second left side air outlet 251 to the second exhaust port 28.

[0038] The following is a specific working mode of a self-starting bellows pump according to a preferred embodiment of the present invention:

[0039] In the initial state, if Figure 1 As shown, the pressure balancing air bag 14 in the first group of reversing components 1 is in an initial equilibrium state, at which time the pressure between the pressure balancing air bag 14 and the liquid outlet 41 is equal. The reversing rod 13 is in a closed position on the left side, and the first air inlet 11 is not connected to the first air outlet 15. The reversing shaft 22 in the second group of reversing components 2 is located on the right side, and the movable slider 23 blocks the second exhaust port 28 and the second right air outlet 252, and the second air inlet 21 and the second left air outlet 251 are connected. The air path reversing shaft 33 in the third group of reversing components 3 is located on the right side, and at this time the recess on the air path reversing shaft 33 enables the third air inlet 31 and the third air outlet 322 to be connected. The reversing shaft control component 34 is located on the right side, and the left push plate 341 is in contact with the air path reversing shaft 33.

[0040] When the bellows pump of the present invention is activated, compressed air is introduced into the first air inlet 11. After the initial compressed air enters the first air inlet 11, it flows through the air passage 12 and enters the pressure-balancing bellows 14. The pressure-balancing bellows begins to expand, driving the reversing lever 13 to move from the left closed position to the right connected position. Once in position, the first air inlet 11 and the first air outlet 15 are connected, and the compressed air flows out of the first air outlet 15.

[0041] A portion of the compressed air flowing out of the first air outlet 15 enters the second air inlet 21, and another portion enters the third air inlet 31. At this point, the second air inlet 21 is connected to the second left air outlet 251, and the second exhaust port 28 and the second right air outlet 252 are sealed by the movable slider 23. The portion of air flowing to the second air inlet 21 flows out of the second left air outlet 251 and flows into the left air bag 45 of the air bag reversing component 4. The left air bag 45 is squeezed and contracted, driving the left pull plate 43 to the right. The left push plate 341 and the movable rod 342 move rightward with the left pull plate 43, thereby pushing the air path reversing shaft 33 in the third reversing component 3 to the right. The movement of the air path reversing shaft 33 connects the third air inlet 31 and the third right-side air outlet 322. Compressed gas flows directly out of the third right-side air outlet 322 through the connecting air passage. This exerts a leftward force on the right piston end face 27 of the second reversing component 2, pushing the reversing shaft 22 leftward, causing the second reversing component 2 to reverse direction. The leftward movement of the reversing shaft 22 also causes the movable slider 23 to slide leftward on the valve core seat 24. Once fully slid, the movable slider 23 blocks the second left-side air outlet 251 and the second exhaust port 28. The second right-side air outlet 252 now connects to the second air inlet 21. The compressed air in the second air inlet 21 now flows out of the second right-side air outlet 252, thus cutting off the air supply from the left side and switching to the right side. The right air bag 46 is squeezed and contracted, driving the right pull plate 44 leftward, which in turn drives the movable rod 342 leftward, and in turn, the reversing shaft control component 34 of the third reversing component 3 leftward. During the movement, the right push plate 343 of the reversing shaft control component 34 contacts the right side of the gas path reversing shaft 33 of the third group of reversing components 3 and pushes it to the left until the gas path reversing shaft 33 moves to the left and is in place, causing the third group to reverse.

[0042] At this time, the third air inlet 31 is connected to the third left air outlet 321. The compressed air that continuously flows in from the third air inlet 31 flows out from the third left air outlet 321 and exerts a rightward force on the left piston end face 26 in the second group of reversing components 2, pushing the reversing shaft 22 to the right. After the reversing shaft 22 moves to the right and is in place, the second group of reversing components 2 returns to its initial position at startup, that is, the second left air outlet 251 is connected to the second air inlet 21. Air flows to the left air bag 45 of the air bag pump reversing component 4, driving the left pull plate 43, and then driving the reversing shaft control component 34 and the air path reversing shaft 33 to move to the right, thereby completing the reciprocating reversal of the third group of reversing components 3 and the second group of reversing components 2. The air bag pump of the present invention operates normally.

[0043] When the liquid-end valve (not shown) in the pipeline to be transported is closed, the medium stays in the pipeline, causing the liquid pressure in the liquid outlet 41 to increase. At this time, the pressure at the liquid outlet 41 increases to be equal to the pressure of the pressure-balancing air bag 14 in the first group of reversing components 1. The pressure-balancing air bag 14 begins to contract, driving the reversing rod 13 to move to the left until it returns to the initial equilibrium state. At this time, the pressure at the liquid outlet 41 is equal to the pressure of the pressure-balancing air bag 14, the reversing rod 13 moves to the left, and the first air inlet 11 and the first air outlet 15 are no longer connected, thereby blocking the compressed air input, and the self-starting air bag pump of the present invention stops operating.

[0044] When the liquid-end valve (not shown) in the belt conveying pipeline is reopened, the medium flows out of the pipeline from the liquid outlet 41. At this time, the pressure at the liquid outlet 41 is lower than the pressure bellows 14 in the first set of reversing components 1. The pressure bellows 14 move again, driving the reversing rod 13 to the right. The first air inlet 11 and the first air outlet 15 are reconnected, and compressed air re-enters the air path of the bellows pump, restarting the bellows pump. When the pressure at the liquid outlet 41 is lower than the pressure of the compressed air, the bellows pump of the present invention operates normally.

[0045] Obviously, those skilled in the art should realize that the above embodiments are only used to illustrate the present invention and are not used to limit the present invention. As long as they are within the scope of the spirit of the present invention, any changes and modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A self-starting bellows pump, characterized in that: include: The first set of reversing components, the second set of reversing components, the third set of reversing components and the air bag pump reversing components, The first set of reversing components includes a first air inlet, a pressure-balancing air bag, a reversing rod, and a first air outlet. An air passage is provided between the first air inlet and the pressure-balancing air bag. The pressure-balancing air bag is fixedly connected to the head of the reversing rod. A fluid passage is provided between the head of the pressure-balancing air bag and the liquid outlet of the self-starting air bag pump. The second group of reversing components includes a second air inlet, a reversing shaft, a movable slider, a valve core base, two second air outlets, a left piston end face and a right piston end face. A chamber is provided between the piston end face and the inner wall of the second group of reversing components, including a left chamber and a right chamber. The second air inlet is communicated with the first air outlet. The two second air outlets include a second left air outlet and a second right air outlet. The reversing shaft is pushed by the left piston end face or the right piston end face, thereby controlling the movable slider to move on the valve core base to cause the compressed air to reverse, and enter the left air bag of the reversing component of the air bag pump from the second left air outlet, or enter the right air bag of the reversing component of the air bag pump from the second right air outlet; The third group of reversing components includes a third air inlet, an air path reversing shaft, a reversing shaft control component and two third air outlets, the third air inlet is connected to the first air outlet, the two third air outlets include a third left air outlet and a third right air outlet, the reversing shaft control component includes a moving rod and a left push plate and a right push plate fixed on both sides of the moving rod, when the moving rod moves left and right, it drives the left push plate or the right push plate to push the air path reversing shaft to move left and right, so that the compressed air flows out from the third left air outlet and acts on the left piston end surface of the second group of reversing components, or flows out from the third right air outlet and acts on the right piston end surface of the second group of reversing components; The air bag pump reversing component includes a left air bag, a right air bag, a left pull plate and a right pull plate. The left air bag is fixedly connected to the left pull plate, the right air bag is fixedly connected to the right pull plate, and the left pull plate and the right pull plate are fixedly connected to the moving rod of the third group of reversing components. When compressed air enters the air bag pump reversing component to compress the right air bag, it drives the right pull plate to move to the left and then drives the moving rod to move to the left. When compressed air enters the air bag pump reversing component to compress the left air bag, it drives the left pull plate to move to the right and then drives the moving rod to move to the right.

2. A self-starting bellows pump according to claim 1, characterized in that: When the pressure-balancing air bag is in the initial state, the reversing rod is located in the closed position on the left side, and the first air inlet is not connected to the first air outlet; when the initial compressed air enters the first air inlet, the compressed air enters the pressure-balancing air bag through the air duct, and the pressure-balancing air bag drives the reversing rod to move to the connecting position on the right side, and the first air inlet is connected to the first air outlet, so that the compressed air flows out from the first air outlet.

3. A self-starting bellows pump according to claim 2, characterized in that: The steps of reversing the direction of the bellows pump are as follows: Part of the compressed air flowing out of the first air outlet enters the second air inlet, and the other part enters the third air inlet; The second group is reversed by moving the reversing shaft, thereby controlling the movable slider to move on the valve core base to cause the compressed air to reverse and enter the left air bag of the air bag pump reversing component through the second left air outlet; When the compressed air compresses the left air bag, it drives the left pull plate to move rightward and then drives the moving rod to move rightward; When the moving rod moves to the right, it drives the left push plate to push the air path reversing shaft to move to the right, causing the compressed air in the third group of reversing components to flow out from the third left air outlet and act on the left piston end surface of the second group of reversing components; The left piston end face is pressurized to move the reversing shaft to the right, thereby driving the movable slider to move rightward on the valve core base to cause the compressed air to reverse direction and enter the right air bag of the air bag pump reversing component through the second right air outlet; When the compressed air compresses the right air bag, it drives the right pull plate to move leftward and then drives the moving rod to move leftward; When the moving rod moves to the left, it drives the right push plate to push the air path reversing shaft to move left, causing the compressed air to flow out from the third right air outlet and act on the right piston end face of the second group of reversing components.

4. A self-starting bellows pump according to claim 1, characterized in that: When the liquid pressure in the liquid outlet pipeline of the bellows pump is lower than the pressure of the compressed air, the bellows pump works normally, reversing left and right to compress the medium inside the reversing component of the bellows pump, thereby achieving liquid discharge.

5. A self-starting bellows pump according to claim 4, characterized in that: When the pressure on the liquid outlet pipeline of the bellows pump is equal to the pressure of the compressed air, the two sides of the pressure-balancing bellows are in a balanced position, and the pressure-balancing bellows maintains its initial state, so that the reversing rod moves to the left to cut off the air source to the reversing component of the bellows pump, thereby stopping the bellows pump from working.

6. A self-starting bellows pump according to claim 5, characterized in that: When the liquid end valve is opened and the medium is discharged from the pipeline, so that the liquid pressure in the liquid outlet is reduced to less than the pressure of the compressed air, the pressure balancing bellows moves again, and the compressed air enters the air path of the bellows pump, causing the bellows pump to operate again.

7. A self-starting bellows pump according to claim 1, characterized in that: The second group of reversing components and the third group of reversing components are both provided with exhaust ports.

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