A pneumatic pump powered by compressed air and its air path reversing control system

Abstract

The present invention discloses a pneumatic pump powered by compressed air and its air path reversing control system. The pneumatic pump comprises: a pump housing, a one-way water inlet valve, an air inlet pipe, an air exhaust valve, a drain pipe and a float valve plate. The one-way water inlet valve is fixed on the bottom surface of the pump housing to facilitate one-way water inlet into the pump housing. The air inlet pipe is sealed and fixed on the pump housing, and one end of the air inlet pipe is located in the pump housing, and the other end is connected to the air exhaust valve outside the pump housing. The drain pipe is sealed and fixed on the pump housing, and the lower port of the drain pipe is located in the lower part of the pump housing. The lower port of the drain pipe is arranged upward, and the float valve plate is movably connected to the lower port of the drain pipe. When water enters the pump housing, the float valve plate floats up and the lower port of the drain pipe opens. When the water in the pump housing is discharged, the float valve plate falls back and the lower port of the drain pipe is closed to prevent air leakage and pressure reduction. The pneumatic pump of the present invention uses compressed air as a power source, which can effectively overcome some shortcomings of traditional electric centrifugal pumps.

Description

Technical Field

[0001] The invention relates to the technical field of water pumps, and in particular to a pneumatic pump using compressed air as power and an air path reversing control system thereof. Background Art

[0002] The information disclosed in the background of the invention is only intended to enhance the understanding of the overall background of the invention and should not be necessarily regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art.

[0003] Electric centrifugal pumps are needed in places such as engineering foundation pits, agricultural irrigation, river and pond drainage, domestic well water extraction, and water pumping to high places. At present, electric centrifugal pumps are mainly used to achieve the above purposes, but electric centrifugal pumps are always accompanied by the following problems: (1) Safety hazards caused by cable rupture due to aging or external force, and leakage caused by decreased insulation of the pump body; (2) It is also very easy to burn the pump under overload, overcurrent, and water shortage; (3) Lubrication, insulation, and sealing all require regular routine inspection, maintenance, and repair. This is due to the design nature of electric centrifugal pumps. Because the power source of electric centrifugal pumps relies on electricity, the impeller relies on rotation to generate centrifugal force, and the motor winding of the submersible pump is built into the pump casing underwater, so insulation, friction, and sealing are key elements that cannot be avoided. If the essential principle has not changed, these essential shortcomings will exist, making it difficult for traditional electric centrifugal pumps to overcome the above problems. Summary of the invention

[0004] In view of the above problems, the present invention provides a pneumatic pump powered by compressed air and its air path reversing control system. The pneumatic pump uses compressed air as a power source and can effectively overcome some shortcomings of traditional electric centrifugal pumps. To achieve the above purpose, the technical solution of the present invention is as follows.

[0005] In the first aspect of the present invention, a pneumatic pump powered by compressed air is disclosed, comprising: a pump housing, a one-way water inlet valve, an air inlet pipe, an air exhaust valve, a drain pipe and a float valve plate, wherein: the one-way water inlet valve is fixed on the bottom surface of the pump housing to facilitate one-way water inlet into the pump housing. The air inlet pipe is sealed and fixed on the pump housing, and one end of the air inlet pipe is located in the pump housing, and the other end is connected to the air exhaust valve outside the pump housing. The drain pipe is sealed and fixed on the pump housing, and the lower port of the drain pipe is located in the lower part of the pump housing. The lower port of the drain pipe is arranged upward, and the float valve plate is movably connected to the lower port of the drain pipe. When water enters the pump housing, the float valve plate floats up and the lower port of the drain pipe opens. When the water in the pump housing is discharged, the float valve plate falls back and the lower port of the drain pipe is closed to prevent air leakage and pressure reduction.

[0006] Furthermore, a check valve is connected to the drain pipe to prevent water in the drain pipe from flowing back.

[0007] Furthermore, the lower end of the drain pipe is bent upward, so that the lower end is arranged upward to facilitate the connection with the float valve plate.

[0008] In the second aspect of the present invention, an air circuit reversing control system of the pneumatic pump powered by compressed air is disclosed, comprising: an air source pipe, a first double-headed cylinder, a first roller reversing valve, a second roller reversing valve, a second double-headed cylinder, a third roller reversing valve, a fourth roller reversing valve and a first double air-controlled reversing valve, wherein: the air inlet and outlet of the first roller reversing valve are respectively connected to the air source pipe and the left end air port of the first double-headed cylinder, the air inlet and outlet of the second roller reversing valve are respectively connected to the air source pipe and the right end air port of the first double-headed cylinder, and the two push rods of the second double-headed cylinder correspond to the rollers of the first roller reversing valve and the second roller reversing valve, respectively. The air inlet and outlet of the third roller reversing valve are respectively connected to the air source pipe and the left air port of the second double air-controlled reversing valve; the air inlet and outlet of the fourth roller reversing valve are respectively connected to the air source pipe and the right air port of the second double air-controlled reversing valve, and the two push rods of the first double-headed cylinder correspond to the rollers of the third roller reversing valve and the fourth roller reversing valve respectively. The two air ports of the second double-headed cylinder are connected to the two air ports of the first double air-controlled reversing valve.

[0009] Furthermore, the air path reversing control system also includes at least one second double air-controlled reversing valve, and each of the second double air-controlled reversing valves corresponds to two of the pneumatic pumps powered by compressed air. The left and right air ports of the second double air-controlled reversing valve are respectively connected to the air outlet of the third roller reversing valve and the air outlet of the fourth roller reversing valve, and the other air port of the second double air-controlled reversing valve is connected to the air source pipe; the air inlet pipes of the two groups of pneumatic pumps are respectively connected to the two air ports of one of the second double air-controlled reversing valves. Therefore, multiple pneumatic pumps powered by compressed air can be connected in parallel on the air path reversing control system as needed to achieve single-channel or multi-channel integrated operation.

[0010] Furthermore, the first roller reversing valve, the second roller reversing valve, the third roller reversing valve, and the fourth roller reversing valve are all provided with exhaust throttle valves to control the required air supply duration.

[0011] Furthermore, the first double air-controlled reversing valve and the second double air-controlled reversing valve are both double air-controlled two-position five-way reversing valves.

[0012] Furthermore, the gas source pipe is connected to an air compressor to provide high-pressure gas to the gas path switching control system and the pneumatic pump.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) The pneumatic pump of the present invention uses compressed air as a power source. The pneumatic pump does not involve electricity during operation. Compared with the traditional electric centrifugal pump, the pneumatic pump eliminates the possibility of electric shock caused by leakage, thereby ensuring the personal safety of the user.

[0015] (2) Since compressed gas is used to supply air to the pneumatic pump of the present invention through an air pipe, even if the air supply pipeline is broken due to external force or aging, it will not cause personal injury or damage to the equipment. Workers can cut off the damaged part without stopping the machine and use a quick plug-in connector to easily reconnect the pipeline to eliminate the fault.

[0016] (3) The pneumatic pump of the present invention has no rotating mechanism and will not generate heat due to friction during operation. The device will not be damaged due to negligence of workers or operation in a waterless state. In addition, the pneumatic pump is easy to operate and can be used with simple understanding. The corresponding pumping volume can be selected according to needs.

[0017] (4) The pneumatic pump of the present invention does not require routine maintenance or regular lubrication, and damaged parts can be replaced without professional training.

[0018] (5) The pneumatic pump of the present invention can be used in an integrated manner in cooperation with the air path reversing control system, so that the two pneumatic pumps in each group of pneumatic pumps can alternately drain and inlet water to achieve continuous pumping. Compared with an electric centrifugal pump with the same flow rate, it can save more than 40% of electricity. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0020] Figure 1 Schematic diagram of the structure of a pneumatic pump powered by compressed air in an embodiment.

[0021] Figure 2 Schematic diagram of the structure of the float valve plate in the embodiment.

[0022] Figure 3 FIG. 1 is a schematic diagram of the structure of a pneumatic pump powered by compressed air in another embodiment.

[0023] Figure 4 Schematic diagram of the structure of the gas path reversing control system in the embodiment.

[0024] The marks in the figure represent: 1-pump housing, 2-one-way water inlet valve, 3-inlet pipe, 4-exhaust valve, 5-drain pipe, 6-float valve plate, 6.1-tube body, 6.2-float, 6.3-valve plate, 7-check valve, 8-air source pipe, 9-first double-headed cylinder, 10-first roller reversing valve, 11-second roller reversing valve, 12-second double-headed cylinder, 13-third roller reversing valve, 14-fourth roller reversing valve, 15-first double air-controlled reversing valve, 16-second double air-controlled reversing valve, 17-exhaust throttle valve, 18-push rod, 19-water inlet hole, 20-connecting tube, A-pneumatic pump, B-pneumatic pump. DETAILED DESCRIPTION

[0025] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0026] In the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" and the like to indicate directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and do not limit the structures. They are only for the convenience of describing the present invention and do not indicate or imply that the referred device or element needs to have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0027] As mentioned above, due to the design nature of the electric centrifugal pump, because the power source of the electric centrifugal pump relies on electricity, the impeller relies on rotation to generate centrifugal force, and the submersible pump motor winding is built into the pump casing underwater, so insulation, friction, and sealing are key factors that cannot be avoided, resulting in many deficiencies in traditional electric centrifugal pumps. To this end, the present invention proposes a pneumatic pump powered by compressed air and its air circuit reversing control system, and the technical solution of the present invention is further described in conjunction with the drawings and embodiments of the specification.

[0028] refer to Figure 1 , an example of a pneumatic pump powered by compressed air, which mainly includes: a pump housing 1, a one-way water inlet valve 2, an air inlet pipe 3, an exhaust valve 4, a drain pipe 5 and a float valve plate 6, wherein:

[0029] The pump housing 1 is a cylindrical structure with an inner cavity. The one-way water inlet valve 2 is fixed on the bottom surface of the pump housing 1 as a water inlet. When in use, water flows into the pump housing in one direction through the one-way water inlet valve to avoid squeezing water out from the water inlet when discharging water.

[0030] The air inlet pipe 3 is sealed and fixed on the top wall of the pump casing 1, and one end of the air inlet pipe 3 is located in the inner cavity of the pump casing 1, and the other end is connected to the exhaust valve 4 outside the pump casing 1. The main function of the exhaust valve 4 is to quickly discharge the compressed air in the inner cavity of the pump casing 1 to facilitate water intake again.

[0031] The drain pipe 5 is sealed and fixed on the pump housing 1, and the lower end of the drain pipe 5 is located at the lower part of the pump housing 1, so as to more thoroughly discharge the water in the pump housing 1; the drain pipe 5 is also connected to a check valve 7 to prevent water from being pressed into the pump and the water in the drain pipe from flowing back when the other pneumatic pump is draining water.

[0032] The lower end of the drain pipe 5 is bent upward, so that the lower end is set upward; the float valve plate 6 is movably connected to the lower end of the drain pipe 5. When water enters the pump housing 1, the float valve plate 6 floats up and the lower end of the drain pipe 5 is opened. When the water in the pump housing 1 is discharged, the float valve plate 6 falls back and the lower end of the drain pipe 5 is closed to prevent air leakage and pressure drop. Further, refer to Figure 2 , the float valve plate 6 comprises a tube body 6.1, a float 6.2 and a valve plate 6.3, wherein: the side wall of the tube body 6.1 is porous and fixed on the drain pipe 5, the float 6.2 is located in the tube body 6.1 and can move up and down in the tube body 6.1, the valve plate 6.3 is horizontally connected to the float 6.2, and the valve plate 6.3 is located below the float 6.2 and above the lower port of the drain pipe 5, the valve plate is a steel plate, and a rubber layer is wrapped on its outer surface to increase the sealing performance of the lower port of the drain pipe 5. As a preferred embodiment, the float 6.2 and the valve plate 6.3 are connected by a flexible rope, so that when the pneumatic pump as a whole has a certain tilt angle, the good contact between the valve plate 6.3 and the lower port of the drain pipe 5 can still be guaranteed.

[0033] When water enters from the one-way water inlet valve 2, as the water level rises, the float 6.2 floats up with the valve plate 6.3 under the action of buoyancy, and the lower end of the drain pipe 5 is opened. When draining, as the water level drops, the float 6.2 and the valve plate 6.3 gradually fall back to the lower end of the drain pipe 5. When the water surface is discharged to a height close to the lower end of the drain pipe 5, the valve plate 6.3 contacts the lower end. Under the dual action of air pressure and water flow, the valve plate 6.3 is pressed and tightly closed with the lower end to achieve sealing, thereby ensuring that the pressure in the pump housing 1 will not continue to drop.

[0034] Further, in a preferred embodiment, a plurality of pneumatic pumps powered by compressed air are used in combination, specifically, referring to Figure 3, including a pneumatic pump powered by compressed air in the lower layer (referred to as the first pneumatic pump) and a pneumatic pump powered by compressed air in the upper layer (referred to as the second pneumatic pump), wherein: the second pneumatic pump is superimposed on the first pneumatic pump, and the top wall of the pump housing 1 of the first pneumatic pump and the bottom surface of the second pneumatic pump are connected through a connecting tube 20 with a water inlet hole 19, and the connecting tube 20 and the first pneumatic pump, and the second pneumatic pump and the connecting tube 20 are fixed together by bolts, and water enters the connecting tube 20 from the water inlet hole 19, and then enters the pump housing 1 of the second pneumatic pump through the one-way water inlet valve 2. The air inlet pipe 3 of the second pneumatic pump passes through the top wall and the lower bottom surface of the pump housing 1 of the second pneumatic pump, and enters the pump housing 1 of the first pneumatic pump. The drain pipe 5 of the first pneumatic pump passes through the top wall of its pump housing 1 and the bottom surface of the pump housing 1 of the second pneumatic pump and then enters the pump housing 1, and is connected to the drain pipe 5 of the second pneumatic pump through a three-way valve, thereby combining two pneumatic pumps powered by compressed air, so that one can drain water while the other can take in water, and they can work alternately to achieve continuous pumping.

[0035] Further, refer to Figure 4 , open a Figure 1 The air path reversing control system of the pneumatic pump powered by compressed air mainly includes: an air source pipe 8, a first double-headed cylinder 9, a first roller reversing valve 10, a second roller reversing valve 11, a second double-headed cylinder 12, a third roller reversing valve 13, a fourth roller reversing valve 14 and a first double air-controlled reversing valve 15, wherein:

[0036] The air source pipe 8 is connected to an air compressor so as to provide high-pressure gas to the air path switching control system and the pneumatic pump.

[0037] The push rod 18 of the first double-headed cylinder 9 extends from the left and right ends to the outside, and the third roller reversing valve 13 and the fourth roller reversing valve 14 are respectively arranged on the left and right sides of the first double-headed cylinder 9, and the roller of the third roller reversing valve 13 corresponds to the push rod 18 on the left end surface of the first double-headed cylinder 9, and the roller of the fourth roller reversing valve 14 corresponds to the push rod 18 on the right end surface of the first double-headed cylinder 9. With the change of the gas path in the first double-headed cylinder 9, the push rod 18 can move left and right, thereby realizing the opening or closing of the third roller reversing valve 13 and the fourth roller reversing valve 14, and controlling the on and off of the compressed gas in the reversing valve.

[0038] Similarly, the push rod 18 of the second double-headed cylinder 12 extends from the left and right ends to the outside, the first roller reversing valve 10 and the second roller reversing valve 11 are respectively arranged on the left and right sides of the second double-headed cylinder 12, and the roller of the first roller reversing valve 10 corresponds to the push rod 18 on the left end surface of the second double-headed cylinder 12, and the roller of the second roller reversing valve 11 corresponds to the push rod 18 on the right end surface of the second double-headed cylinder 12. As the gas path in the second double-headed cylinder 12 changes, the push rod 18 can move left and right, thereby realizing the opening or closing of the first roller reversing valve 10 and the second roller reversing valve 11, and controlling the on and off of the compressed gas in the reversing valve.

[0039] Furthermore, the air inlet and outlet of the first roller reversing valve 10 are respectively connected to the air source pipe 8 and the left air port of the first double-headed cylinder 9; the air inlet and outlet of the second roller reversing valve 11 are respectively connected to the air source pipe 8 and the right air port of the first double-headed cylinder 9. The air inlet and outlet of the third roller reversing valve 13 are respectively connected to the air source pipe 8 and the left air port of the second double air-controlled reversing valve 15; the air inlet and outlet of the fourth roller reversing valve 14 are respectively connected to the air source pipe 8 and the right air port of the second double air-controlled reversing valve 15.

[0040] The two air ports of the second double-headed cylinder 12 are connected to the two air ports of the first double-air-controlled reversing valve 15 , and the first double-air-controlled reversing valve 15 is connected to the air source pipe 8 .

[0041] The first roller reversing valve 10, the second roller reversing valve 11, the third roller reversing valve 13 and the fourth roller reversing valve 14 are all provided with an exhaust throttle valve 17. The movement speed of the first double-headed cylinder 9 and the second double-headed cylinder 12 is controlled by setting the opening of the exhaust throttle valve 17 to control the required air supply duration, thereby realizing a timed exchange of the working air circuit, alternately supplying air to the pneumatic pump at a timed interval, and using gas pressure to discharge water from the pneumatic pump.

[0042] Therefore, the air path reversing control system further includes a second double air-controlled reversing valve 16, and the first double air-controlled reversing valve 15 and the second double air-controlled reversing valve 16 are both double air-controlled two-position five-way reversing valves, thereby satisfying the requirement that the double air-controlled reversing valve needs to be connected to five air paths. The left and right end air ports of the second double air-controlled reversing valve 16 are respectively connected to the air outlet of the third roller reversing valve 13 and the air outlet of the fourth roller reversing valve 14, and the other air port of the second double air-controlled reversing valve 16 is connected to the air source pipe 8; the air inlet pipes 3 of the two groups of the pneumatic pumps are respectively connected to the two air ports of the second double air-controlled reversing valve 16.

[0043] Further, continue to refer to Figure 4The air outlet of the third roller reversing valve 13 and the air outlet of the fourth roller reversing valve 14 can also be connected in parallel to a plurality of second double air-controlled reversing valves 16, and each of the second double air-controlled reversing valves 16 corresponds to two of the pneumatic pumps powered by compressed air, so that a plurality of the pneumatic pumps powered by compressed air can be connected in parallel on the air path reversing control system as needed to realize single-path or multi-path integrated operation.

[0044] The working principle of the air path reversing control system is as follows: the air compressor works, and the compressed air enters the first double air-controlled reversing valve 15 and the second double air-controlled reversing valve 16, wherein: for the first double air-controlled reversing valve 15, the gas first passes through its left air port and then reaches the right end air port of the second double-headed cylinder 12, and the push rod 18 of the second double-headed cylinder 12 moves to the left under the push of the gas, and the roller on the first roller reversing valve 10 is pressed down, and the air path of the first roller reversing valve 10 is connected, and the gas reaches the left end air port of the first double-headed cylinder 9, and the first double-headed cylinder 9 is pushed by the gas. The push rod 18 moves to the right, pressing down the roller on the fourth roller reversing valve 14, and the gas reaches the right end gas port of the first double air-controlled reversing valve 15, pushing the valve core to move to the left, causing reversal. At this time, the right path of the first double air-controlled reversing valve 15 is connected, and the gas reaches the left end gas port of the second double-headed cylinder 12. Its push rod 18 moves to the right, and the gas path of the second roller reversing valve 11 is connected. Similarly, the gas path of the third roller reversing valve 13 is connected, and the gas reaches the left end gas port of the first double air-controlled reversing valve 15, causing reversal. This reciprocating process realizes continuous switching of the gas path. The speed of the movement of the first double-headed cylinder 9 and the second double-headed cylinder 12 is controlled by setting the opening of the exhaust throttle valve 17 to control the required gas supply time, thereby realizing the timed exchange of the working gas path, and alternately supplying gas to the pneumatic pump at a timed interval.

[0045] Furthermore, in the above process, the left and right end gas ports of the second double air-controlled reversing valve 16 are switched with the switching of the gas path, and the valve core therein also moves left and right, thereby realizing the switching of the gas direction entering the second double air-controlled reversing valve 16 from the gas source pipe 8. Figure 1 The pneumatic pump shown can be used when one pneumatic pump (A) is taking in water while the other pneumatic pump (B) is draining water. When it is close to being emptied, the air supply path is reversed, and the compressed air in the inner cavity of the pneumatic pump B is discharged by the quick exhaust valve 4 installed in the air inlet pipe 3. After the pressure in the pneumatic pump B is released, the one-way water inlet valve 2 becomes free, and water flows into the pneumatic pump B again to fill it. When the pneumatic pump B is exhausting, the pneumatic pump A starts to drain water, so that the two pneumatic pumps alternately drain water and take in water, realizing continuous pumping.

[0046] In addition, when water is pumped out, part of the pressure of the discharged water will be fed back to the air supply circuit, and the air supply circuit can produce a reversing air supply action even before the valve plate closes the lower port of the drain pipe 5. In the waterless state, the water inlet is closed, the float valve plate closes the lower port of the drain pipe 5, and the two pneumatic pumps A and B are both in a closed state. The pressure in one of the pump bodies rises, and part of the pressure is distributed to the air supply circuit, which then produces a reversing air supply action, switching to supply air to the other pump body, and realizing reciprocating work in the waterless state.

[0047] Finally, it should be noted that any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. Although the above describes the specific implementation of the present invention in conjunction with the drawings, it is not a limitation of the protection scope of the present invention. Those skilled in the art should understand that on the basis of the technical solution of the present invention, various modifications or deformations that can be made by those skilled in the art without creative labor are still within the protection scope of the present invention.

Claims

1. A pneumatic pump system powered by compressed air, comprising: Two pneumatic pumps powered by compressed air and an air path reversing control system. Each of the pneumatic pumps powered by compressed air comprises: Pump housing; Exhaust valve; A one-way water inlet valve, wherein the one-way water inlet valve is fixed on the bottom surface of the pump housing; An air inlet pipe, wherein the air inlet pipe is sealed and fixed on the pump housing, and one end of the air inlet pipe is located inside the pump housing, and the other end is connected to the exhaust valve outside the pump housing; A drain pipe, the drain pipe is sealed and fixed on the pump housing, the lower end of the drain pipe is located at the lower part of the pump housing; the lower end of the drain pipe is arranged upward; and A float valve plate, wherein the float valve plate is movably connected to the lower port of the drain pipe; The air path reversing control system includes: an air source pipe, a first double-headed cylinder, a first roller reversing valve, a second roller reversing valve, a second double-headed cylinder, a third roller reversing valve, a fourth roller reversing valve and a first double-air controlled reversing valve, wherein: the air inlet and air outlet of the first roller reversing valve are respectively connected to the air source pipe and the left end air port of the first double-headed cylinder; the air inlet and air outlet of the second roller reversing valve are respectively connected to the air source pipe and the right end air port of the first double-headed cylinder; the two push rods of the second double-headed cylinder are respectively Corresponding to the rollers of the first roller reversing valve and the second roller reversing valve; the air inlet and outlet of the third roller reversing valve are respectively connected to the air source pipe and the left end air port of the second double air-controlled reversing valve; the air inlet and outlet of the fourth roller reversing valve are respectively connected to the air source pipe and the right end air port of the second double air-controlled reversing valve, and the two push rods of the first double-headed cylinder correspond to the rollers of the third roller reversing valve and the fourth roller reversing valve respectively; the two air ports of the second double-headed cylinder are connected to the two air ports of the first double air-controlled reversing valve; The air path reversing control system also includes at least one second double air-controlled reversing valve, each of which corresponds to two of the pneumatic pumps powered by compressed air; the left and right end air ports of the second double air-controlled reversing valve are respectively connected to the air outlet of the third roller reversing valve and the air outlet of the fourth roller reversing valve, and the other air port of the second double air-controlled reversing valve is connected to the air source pipe; the air inlet pipes of the two pneumatic pumps powered by compressed air are respectively connected to the two air ports of one of the second double air-controlled reversing valves.

2. The pneumatic pump system powered by compressed air according to claim 1, characterized in that: The drain pipe is also connected with a check valve.

3. The pneumatic pump system powered by compressed air according to claim 1, characterized in that: The lower end of the drain pipe is bent upward so that the lower end of the drain pipe is arranged upward.

4. The pneumatic pump system powered by compressed air according to claim 1, characterized in that: The float valve plate includes a tube body, a float and a valve plate, wherein: the side wall of the tube body is porous and fixed on the drain pipe, the float is located in the tube body and can move up and down in the tube body, the valve plate is horizontally connected to the float, and the valve plate is located below the float and above the lower port of the drain pipe.

5. The pneumatic pump system powered by compressed air according to claim 4, characterized in that: The float ball and the valve plate are connected by a flexible rope.

6. The pneumatic pump system powered by compressed air according to any one of claims 1 to 5, characterized in that: Two pneumatic pumps powered by compressed air, namely a first pneumatic pump and a second pneumatic pump; The first pneumatic pump is superimposed on the second pneumatic pump, and the top wall of the pump housing of the first pneumatic pump and the bottom surface of the second pneumatic pump are connected via a connecting tube with a water inlet hole; The air inlet pipe of the second pneumatic pump passes through the top wall and the bottom surface of the pump housing of the first pneumatic pump and enters the pump housing of the second pneumatic pump; The drainage pipe of the second pneumatic pump passes through the top wall of its pump housing and the bottom surface of the pump housing of the first pneumatic pump and then enters the pump housing and is communicated with the drainage pipe of the first pneumatic pump.

7. The pneumatic pump system powered by compressed air as claimed in claim 1, characterized in that: The first roller reversing valve, the second roller reversing valve, the third roller reversing valve and the fourth roller reversing valve are all provided with exhaust throttle valves.

8. The pneumatic pump system powered by compressed air as claimed in claim 1, characterized in that: The first double air-controlled reversing valve and the second double air-controlled reversing valve are both double air-controlled two-position five-way reversing valves.

9. The pneumatic pump system powered by compressed air as claimed in claim 1, characterized in that: The air source pipe is connected with an air compressor.

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