Self-starting bellows pump

Abstract

The present invention provides a self-starting bellows pump, comprising: a first reversing assembly, a second reversing assembly, a third reversing assembly, and a bellows pump reversing assembly. According to the self-starting bellows pump of the present invention, the entire pump drive relies on compressed air to provide power, and no electric drive is required. The start and stop of the pump are jointly controlled by the opening or closing of a valve at a liquid receiving end in a delivery pipe and the pressure of a driving air source, without the need for a complex superordinate control system, thereby reducing control costs. Additionally, the unique structure simplifies the control structure of the entire liquid supply system, reduces the failure rate, and improves the reliability of the liquid supply system.

Description

Self-starting air bag pump TECHNICAL FIELD

[0001] The present application relates to the technical field of air bag pumps, in particular to a self-starting air bag pump. BACKGROUND

[0002] In the process of semiconductor manufacturing, toxic, strong acid, strong alkali and other harmful substances need to be transmitted from the factory end to the machine end. The pipeline, valve, pipe fitting and chemical pump used in the transmission process require reliable sealing and long service life. The air bag pump used in the semiconductor pipeline is currently controlled by a control system. After the upper computer or PLC (programmable logic controller) receives the control signal from the liquid end, it controls the start or stop of the chemical pump. The control process is complex, and the complex control system increases the cost and the failure rate. SUMMARY

[0003] The present application proposes a self-starting air bag pump to solve the defects in the prior art.

[0004] A self-starting air bag pump, comprising: a first group of reversing components, a second group of reversing components, a third group of reversing components, and an air bag pump reversing component,

[0005] The first group of reversing components comprises a first air inlet, a pressure balance air bag, a reversing rod and a first air outlet, the first air inlet and the pressure balance air bag have an air passage therebetween, the pressure balance air bag is fixedly connected with the head of the reversing rod, and the head of the pressure balance air bag is in liquid communication with the liquid outlet of the self-starting air bag pump;

[0006] The second group of reversing components comprises a second air inlet, a reversing shaft, a moving slider, a valve core base, two second air outlets, a left piston end face and a right piston end face, there is a chamber 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 in communication 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, so as to control the movement of the moving slider on the valve core base to facilitate the reversing of compressed air, and the second left air outlet enters the left air bag of the air bag pump reversing component, or the second right air outlet enters the right air bag of the air bag pump reversing component;

[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 in communication with 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, the left push plate or the right push plate pushes 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 face of the second group of reversing components, or flows out from the third right air outlet and acts on the right piston end face of the second group of reversing components;

[0008] The wind bag pump reversing component includes a left wind bag, a right wind bag, a left pull plate and a right pull plate, the left wind bag is fixedly connected with the left pull plate, the right wind bag is fixedly connected with the right pull plate, and the left pull plate and the right pull plate are fixedly connected with the moving rod of the third group of reversing components, when the compressed air enters the wind bag pump reversing component to compress the right wind bag, the right pull plate is driven to move left, and in turn drives the moving rod to move to the left side, when the compressed air enters the wind bag pump reversing component to compress the left wind bag, the left pull plate is driven to move right, and in turn drives the moving rod to move to the right side.

[0009] Preferably, in the initial state of the pressure balance wind bag, the reversing rod is located at the left closed position, and the first air inlet is not in communication with the first air outlet; when the initial compressed air enters the first air inlet, the compressed air enters the pressure balance wind bag through the air duct, the pressure balance wind bag drives the reversing rod to move to the right communication position, the first air inlet is in communication with the first air outlet, so that the compressed air flows out from the first air outlet.

[0010] Preferably, the steps of left and right reversing of the wind bag pump are as follows:

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

[0012] By moving the reversing shaft to reverse the second group, the moving slider is controlled to move on the valve core base to facilitate the reversing of the compressed air, and the left wind bag of the wind bag pump reversing component is entered by the second left air outlet;

[0013] When the compressed air compresses the left wind bag, the left pull plate is driven to move right, and in turn drives the moving rod to move right;

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

[0015] The pressure on the left piston end face makes the reversing shaft move right, which drives the moving slider to move right on the valve core base to make the compressed air reverse, enter the right air bag of the air bag pump reversing component from the second right air outlet;

[0016] When the compressed air makes the right air bag compress, the right pull plate moves left, which drives the moving rod to move left;

[0017] When the moving rod moves left, the right push plate pushes the air path reversing shaft to move left, which makes the compressed air 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 air bag pump is less than the pressure of the compressed air, the air bag pump normally works, reverses the medium in the air bag reversing component left and right, so as to realize the discharge of the liquid.

[0019] Preferably, when the pressure on the liquid outlet pipeline of the air bag pump is equal to the pressure of the compressed air, the two sides of the pressure balance air bag are in the balanced position, the pressure balance air bag keeps the initial state, so that the reversing rod moves left to cut off the air source to the air bag pump reversing component, so that the air bag pump stops working.

[0020] Preferably, when the liquid end valve is opened, the medium discharge pipeline, so that the liquid pressure in the liquid outlet is reduced to be less than the pressure of the compressed air, the pressure balance air bag moves again, the compressed air enters the air path of the air bag pump, so that the air bag pump works again.

[0021] Preferably, the second group of reversing components and the third group of reversing components are provided with air outlets.

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

[0023] The self-starting air bag pump of the present application relies on compressed air to provide power for the whole pump drive, without the need for electric power drive. The start and stop of the pump are controlled by the opening or closing of the valve of the liquid end in the conveying pipeline and the pressure of the driving air source, without the need for a complex upper control system, which reduces the control cost. At the same time, the unique structure simplifies the control structure of the whole liquid supply system, reduces the failure rate, and improves the reliability of the liquid supply system. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a schematic diagram of the working principle of a self-starting wind bag pump according to the preferred embodiment of the present application.

[0025] Figure 2 is a schematic diagram of the first set of reversing components of a self-starting wind bag pump according to the preferred embodiment of the present application.

[0026] Figure 3 is a schematic diagram of the second set of reversing components of a self-starting wind bag pump according to the preferred embodiment of the present application.

[0027] Figure 4 is a schematic diagram of the third set of reversing components and the wind bag pump reversing components of a self-starting wind bag pump according to the preferred embodiment of the present application.

[0028] Figure 5 is a structural diagram of the wind bag pump reversing components of a self-starting wind bag pump according to the preferred embodiment of the present application. DETAILED DESCRIPTION

[0029] The embodiments of the present application will be described below with reference to the accompanying drawings. It should be noted that the embodiments described in the present specification are not exhaustive, and do not represent the only embodiment of the present application. The following embodiments are only intended to clearly illustrate the content of the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, different forms of changes and modifications can be made on the basis of the embodiments described above, and any changes or modifications that fall within the technical concept and content of the present application are within the scope of protection of the present application.

[0030] Figure 1 is a schematic diagram of the working principle of a self-starting wind bag pump according to the preferred embodiment of the present application. The self-starting wind bag pump of the present application comprises a first set of reversing components 1, a second set of reversing components 2, a third set of reversing components 3, and wind bag pump reversing components 4. Each component will be described in detail below with reference to Figures 2-5.

[0031] As shown in Figure 2, the first set of reversing components 1 comprises a first air inlet 11, a pressure balance wind bag 14, a reversing rod 13, and a first air outlet 15. The first air inlet 11 has an air passage 12 with the pressure balance wind bag 14, the pressure balance wind bag 14 is threadedly connected to the head of the reversing rod 13, and the head of the pressure balance wind bag 14 is in fluid communication with the liquid outlet 41 in the wind bag pump reversing components 4. Specifically, the head of the pressure balance wind bag 14 is connected to the reversing rod 13, and the tail of the pressure balance wind bag 14 is fixed to the inner cavity wall of the first set of reversing components 1, and the reversing rod 13 moves back and forth in the inner cavity of the first set of reversing components 1 along with the relaxation and contraction of the pressure balance wind bag 14.

[0032] As shown in Fig. 3, the second group of switching components includes a second air inlet 21, a switching shaft (piston) 22, a moving slider 23, a valve core base 24, two second air outlets 25, a second air outlet 28, a left piston end face 26 and a right piston end face 27. The left piston end face 26 and the left inner wall of the second group of switching components 2 have a left chamber 261 therebetween, and the right piston end face 27 and the right inner wall of the second group of switching components 2 have a right chamber 271 therebetween. The second air inlet 21 is in communication with 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 switching shaft (piston) 22 is pushed by the left piston end face 26 or the right piston end face 27, thereby controlling the movement of the moving slider 23 on the valve core base 24 to facilitate the switching of compressed air. The compressed air enters the air bag pump switching component 4 from the second left air outlet 251 to compress the left air bag 45, or enters the air bag pump switching component 4 from the second right air outlet 252 to compress the right air bag 46. Preferably, the moving slider 23 is fixed to slide with the switching shaft (piston) 22 on the valve core base 24, and the size of the moving slider 23 matches the second air outlet 25, and after sliding into position, the moving slider 23 simultaneously blocks the second air outlet 28 and any one of the two second air outlets 251, 252.

[0033] As shown in Fig. 4, the third group of switching components 3 includes a third air inlet 31, an air path switching shaft 33, a switching shaft control component 34, and two third air outlets 32. The third air inlet 31 is in communication with the first air outlet 15 in the first group of switching components 1. The two third air outlets 32 include a third left air outlet 321 and a third right air outlet 322. The switching shaft control component 34 includes a moving rod 342 and left and right push plates 341, 343 fixed to the two sides of the moving rod 342. When the moving rod 342 moves left, the right push plate 343 pushes the air path switching shaft 33 to move left, causing compressed air to flow out of the third left air outlet 321 and act on the left piston end face 26 of the second group of switching components 2; when the moving rod 342 moves right, the left push plate 341 pushes the air path switching shaft 33 to move right, causing compressed air to flow out of the third right air outlet 322 and act on the right piston end face 27 of the second group of switching 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 group of switching components 3, and the third air inlet 31 is located between the two third air outlets 32. The air path switching shaft 33 moves left and right in the inner cavity of the third group of switching components 3, and the air path switching shaft 33 has a plurality of recesses on the side opposite to the third air inlet 31 and the two third air outlets 32. When the air path switching shaft 33 moves into position, one of the recesses can simultaneously communicate the third air inlet 31 and any one of the two third air outlets 32.

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

[0036] As shown in FIGS. 4-5, the air bag pump reversing component 4 includes an outlet 41, an inlet 42, a left air bag 45, a right air bag 46, a left pull plate 43, and a right pull plate 44. The left pull plate 43 and the right pull plate 44 are fixedly connected with the moving rod 342 of the reversing shaft control component 34 of the third set of reversing components 3 in a threaded manner. The left pull plate 43 is fixedly connected with the left air bag 45 through a pin shaft 47, and the right pull plate 44 is also fixedly connected with the right air bag 46 through a pin shaft, so as to realize the synchronization of air bag compression / dilation and pull plate movement. The air bag is located in an air bag pump housing 48, and when compressed air enters the air bag pump housing 48, the air bag is compressed due to the pressure. As shown in FIG. 5, the right air bag 46 is in a compressed state, and the left air bag 45 is in a dilated state. The outlet 41 and the inlet 42 are fixedly connected with the left air bag 45 and the right air bag 46 respectively in a threaded manner. When compressed air enters the air bag pump reversing component 4 to compress the right air bag 46, the right pull plate 44 is driven to move leftwards, and in turn drives the moving rod 342 to move to the left side, and at the same time, the left pull plate 43 is also driven to move leftwards, thereby pulling the left air bag 45 to dilate. When compressed air enters the air bag pump reversing component 4 to compress the left air bag 45, the left pull plate 43 is driven to move rightwards, and in turn drives the moving rod 342 to move to the right side, and at the same time, the right pull plate 44 is also driven to move rightwards, thereby pulling the right air bag 46 to dilate.

[0037] In addition, the second group of reversing components 2 and the third group of reversing components 3 are provided with exhaust ports, including the second exhaust port 28 in the second group of reversing components 2 and the two third exhaust ports 35 (i.e. the third left exhaust port 351 and the third right exhaust port 352) in the third group of reversing components 3. The exhaust ports are used for gas discharge when the air bag pump reversing components 4 are reversed left and right and for gas discharge when the second group of reversing components 2 are reversed left and right. For example, when the gas path reversing shaft 33 of the third group of reversing components 3 moves to the left in place, the third inlet port 31 is in communication with the third left outlet port 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 from the original inlet path through the third right outlet port 322, and is discharged from the air bag pump through the third right exhaust port 352 (at this time, the recess of the gas path reversing shaft 33 makes the third right outlet port 322 in communication with the third right exhaust port 352). In addition, when the gas path reversing shaft 33 of the third group of reversing components 3 moves to the right in place, the right air bag 46 in the air bag pump reversing components 4 is relaxed to squeeze the gas out, which is discharged from the air bag pump through the second right outlet port 252 from the second exhaust port 28 (at this time, the position of the valve core base 24 makes the second right outlet port 252 in communication with the second exhaust port 28). When the gas path reversing shaft 33 moves to the left in place, the gas in the left chamber 261 of the second group of reversing components 2 is also discharged through the third left outlet port 321 to the third left exhaust port 351 from the original inlet path (at this time, the recess of the gas path reversing shaft 33 makes the third left outlet port 321 in communication with the third left exhaust port 351), and the gas in the left air bag 45 of the air bag pump reversing components 4 is also discharged through the second left outlet port 251 to the second exhaust port 28 from the original inlet path.

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

[0039] In the initial state, as shown in FIG. 1, the pressure balance air bag 14 in the first group of reversing components 1 is in the initial balance state, at which time the pressure between the pressure balance air bag 14 and the liquid outlet 41 is equal. The reversing rod 13 is in the left closed position, and the first inlet port 11 is not in communication with the first outlet port 15. The reversing shaft 22 in the second group of reversing components 2 is on the right side, and the moving slider 23 blocks the second exhaust port 28 and the second right outlet port 252, and the second inlet port 21 is in communication with the second left outlet port 251. The gas path reversing shaft 33 in the third group of reversing components 3 is on the right side, at which time the recess on the gas path reversing shaft 33 makes the third inlet port 31 in communication with the third outlet port 322. The reversing shaft control component 34 is on the right side, and the left push plate 341 is in contact with the gas path reversing shaft 33.

[0040] When the air bag pump of the present application is started, compressed air is introduced into the first air inlet 11. After the initial compressed air enters the first air inlet 11, the compressed air enters the pressure balance air bag 14 through the air passage 12, and the pressure balance air bag starts to relax, driving the reversing rod 13 to move from the left closed position to the right communication position, and sliding into position, the first air inlet 11 and the first air outlet 15 are in communication with each other, and the compressed air flows out of the first air outlet 15.

[0041] Part of the compressed air flowing out of the first air outlet 15 enters the second air inlet 21, and the other part enters the third air inlet 31. At this time, the second air inlet 21 and the second left air outlet 251 are in communication, and the second exhaust port 28 and the second right air outlet 252 are closed by the moving slider 23. The aforementioned part of the gas flowing into 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 shrunk, driving the left pull plate 43 to move to the right. The left push plate 341 and the moving rod 342 move to the right with the left pull plate 43, so that the left push plate 341 pushes the air path reversing shaft 33 in the third group of reversing components 3 to move to the right. Through the movement of the air path reversing shaft 33, the third air inlet 31 and the third right air outlet 322 are in communication, and the compressed gas directly flows out of the third right air outlet 322 through the connecting air passage, and exerts a leftward force on the right piston end surface 27 of the second group of reversing components 2, pushing the reversing shaft 22 to move to the left, so that the second group of reversing components 2 is reversed. The reversing shaft 22 moves to the left while also driving the moving slider 23 to slide to the left on the valve core base 24. After sliding into position, the moving slider 23 blocks the second left air outlet 251 and the second exhaust port 28, and the second right air outlet 252 is in communication with the second air inlet 21 at this time. The compressed air in the second air inlet 21 now flows out of the second right air outlet 252, thereby cutting off the left gas supply and switching to right gas supply. The right air bag 46 is squeezed and shrunk, driving the right pull plate 44 to move to the left, driving the moving rod 342 to move to the left, and then driving the reversing shaft control component 34 of the third group of reversing components 3 to move to the left. During the movement, the right push plate 343 of the reversing shaft control component 34 contacts the air path reversing shaft 33 of the third group of reversing components 3 on the right side and pushes it to the left, until the air path reversing shaft 33 moves to the left until the third group of reversing.

[0042] At this time, the third inlet port 31 is in communication with the third left outlet port 321, and the compressed air continuously flowing from the third inlet port 31 flows out from the third left outlet port 321, and exerts a rightward force on the left piston end face 26 in the second group of reversing components 2, and pushes the reversing shaft 22 to move rightward. When the reversing shaft 22 moves rightward to the position, the second group of reversing components 2 returns to the initial position at the start, i.e., the second left outlet port 251 is in communication with the second inlet port 21, and the air flows to the left air bag 45 of the air bag pump reversing component 4, drives the left pull plate 43, and then drives the reversing shaft control component 34 and the air path reversing shaft 33 to move rightward, thereby completing the reciprocating reversing of the third group of reversing components 3 and the second group of reversing components 2, and the air bag pump of the present application works normally.

[0043] When the liquid end valve (not shown) in the pipeline to be conveyed is closed, the medium stays in the pipeline, so that the liquid pressure in the liquid outlet port 41 increases. At this time, the pressure at the liquid outlet port 41 increases to equal the pressure of the pressure balance air bag 14 in the first group of reversing components 1, the pressure balance air bag 14 starts to contract, and drives the reversing rod 13 to move leftward to return to the initial balance state. At this time, the pressure at the liquid outlet port 41 is equal to the pressure of the pressure balance air bag 14, the reversing rod 13 moves to the left, the first inlet port 11 is no longer in communication with the first outlet port 15, and the input of compressed air is blocked, and the self-starting air bag pump of the present application stops running.

[0044] When the liquid end valve (not shown) in the pipeline to be conveyed is reopened, the medium flows out from the pipeline from the liquid outlet port 41. At this time, the pressure at the liquid outlet port 41 is less than the pressure of the pressure air bag 14 in the first group of reversing components 1, the pressure air bag 14 moves again, drives the reversing rod 13 to move rightward, the first inlet port 11 and the first outlet port 15 are in communication again, compressed air reenters the air path of the air bag pump, and the air bag pump is restarted. Under the condition that the pressure at the liquid outlet port 41 is less than the pressure of the compressed air, the air bag pump of the present application works normally.

[0045] Obviously, those skilled in the art should recognize that the above embodiments are only used to illustrate the present application, and are not used as a limitation on the present application, and as long as the changes and modifications of the above described embodiments are within the scope of the spirit of the present application, they will fall within the scope of the claims of the present application.

Claims

1. A self-starting bellows pump characterized by, Comprise: The first group of reversing components, the second group of reversing components, the third group of reversing components and the wind bag pump reversing component, The first group of reversing components includes a first air inlet, a pressure balanced wind bag, a reversing rod and a first air outlet, an air passage between the first air inlet and the pressure balanced wind bag, the pressure balanced wind bag and the head of the reversing rod are fixedly connected, the head of the pressure balanced wind bag and the liquid passage between the outlet of the self-starting wind bag pump are in communication; The second group of reversing components includes a second air inlet, a reversing shaft, a moving slider, a valve core base, two second air outlets, a left piston end face and a right piston end face, there is a chamber 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 in communication 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, so as to control the movement of the moving slider on the valve core base to promote the reversing of compressed air, the second left air outlet enters the left wind bag of the wind bag pump reversing component, or the second right air outlet enters the right wind bag of the wind bag pump reversing component; The third group of reversing components includes a third air inlet, a gas path reversing shaft, a reversing shaft control component and two third air outlets, the third air inlet is in communication with 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, the left push plate or the right push plate pushes the gas path reversing shaft to move left and right, so as to make compressed air flow out from the third left air outlet and act on the left piston end face of the second group of reversing components, or from the third right air outlet and act on the right piston end face of the second group of reversing components; The wind bag pump reversing component includes a left wind bag, a right wind bag, a left pull plate and a right pull plate, the left wind bag is fixedly connected with the left pull plate, the right wind bag is fixedly connected with the right pull plate, the left pull plate and the right pull plate are fixedly connected with the moving rod of the third group of reversing components, when compressed air enters the wind bag pump reversing component to compress the right wind bag, the right pull plate is driven to move left and in turn drives the moving rod to move to the left side, when compressed air enters the wind bag pump reversing component to compress the left wind bag, the left pull plate is driven to move right and in turn drives the moving rod to move to the right side.

2. A self-starting bellows pump according to claim 1, wherein, The pressure balanced wind bag is in the initial state, the reversing rod is in the left closed position, the first air inlet is not in communication with the first air outlet; when the initial compressed air enters the first air inlet, the compressed air enters the pressure balanced wind bag through the air passage, the pressure balanced wind bag drives the reversing rod to move to the right communication position, the first air inlet is in communication with 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, wherein, The steps of left and right reversing of the wind bag pump are as follows: A portion of the compressed air flowing out of the first outlet port enters the second inlet port, and another portion enters the third inlet port; The second set of reversing components is moved by the reversing shaft, so as to control the movement of the moving slider on the valve core base to facilitate the reversing of the compressed air from the second left outlet port into the left air bag of the air bag pump reversing component; When the compressed air compresses the left air bag, the left pull plate is driven to move right, and in turn the moving rod is driven to move right; When the moving rod moves right, the left push plate is driven to push the air path reversing shaft to move right, so as to facilitate the compressed air in the third set of reversing components to flow out of the third left outlet port and act on the left piston end face of the second set of reversing components; The left piston end face is pressed to move the reversing shaft right, so as to drive the moving slider to move right on the valve core base to facilitate the reversing of the compressed air from the second right outlet port into the right air bag of the air bag pump reversing component; When the compressed air compresses the right air bag, the right pull plate is driven to move left, and in turn the moving rod is driven to move left; When the moving rod moves left, the right push plate is driven to push the air path reversing shaft to move left, so as to facilitate the compressed air to flow out of the third right outlet port and act on the right piston end face of the second set of reversing components.

4. A self-starting bellows pump according to claim 1, wherein, When the liquid pressure in the outlet pipe of the air bag pump is less than the pressure of the compressed air, the air bag pump normally works, and reverses left and right to compress the medium inside the air bag reversing component, so as to realize the discharge of the liquid.

5. A self-starting bellows pump according to claim 4, wherein, When the pressure on the outlet pipe of the air bag pump is equal to the pressure of the compressed air, the two sides of the pressure balance air bag are in a balanced position, the pressure balance air bag remains in the initial state, so that the reversing rod moves left to cut off the air source to the air bag pump reversing component, so that the air bag pump stops working.

6. A self-starting bellows pump according to claim 5, wherein, When the liquid end valve is opened, the medium discharge pipeline, so that the liquid pressure in the outlet is reduced to less than the pressure of the compressed air, the pressure balance air bag moves again, the compressed air enters the air path of the air bag pump, so that the air bag pump works again.

7. A self-starting bellows pump according to claim 1, wherein, The second set of reversing components and the third set of reversing components are provided with exhaust ports.

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