A leak-proof pneumatic diaphragm pump

Abstract

The present invention relates to the technical field of diaphragm pumps, and proposes a leak-proof pneumatic diaphragm pump, comprising a first sliding rod slidably arranged on a diaphragm pump body, the two ends of the first sliding rod are respectively located in two first containing spaces, the center of the first diaphragm is arranged at the two ends of the first sliding rod, and after the first sliding rod slides, the first diaphragms at the two ends of the first sliding rod stretch or shrink; a filter plate is arranged in the first containing space, the filter plate is located at one end of the first connecting pipe close to the feed pipe, the filter plate is used to filter solids in the liquid, and the first diaphragm does not contact the filter plate after stretching. Through the above technical solution, the problem that the diaphragm is easily damaged by solid particles in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of diaphragm pumps, and in particular to a leakage-proof pneumatic diaphragm pump. Background Art

[0002] A pneumatic diaphragm pump is a positive displacement pump powered by compressed air. The movement of the diaphragm changes the volume of the pump chamber. When the diaphragm moves to one side, the volume of the pump chamber decreases, and the medium is squeezed out of the pump chamber, thereby achieving medium transportation. Pneumatic diaphragm pumps are usually used in the transportation of corrosive media, high viscosity or solid particle-containing media, oil or natural gas, liquid medicine, food, etc. In the process of transporting media containing solid particles, solid particles can easily damage the diaphragm, thereby causing leakage of the diaphragm pump.

[0003] The prior art discloses a high suction-lift pneumatic diaphragm pump in a patent with publication number: CN 113944613 A. A filter is added in front of the diaphragm to prevent solid particles from directly contacting the diaphragm, thereby causing damage to the diaphragm. However, in actual use, the tips of solid particles may be stuck on the surface of the filter. When the diaphragm contacts the surface of the filter, the tips of these solid particles will damage the diaphragm. Summary of the invention

[0004] The present invention provides a leak-proof pneumatic diaphragm pump, which solves the problem in the related art that the diaphragm is easily damaged by solid particles.

[0005] The technical solution of the present invention is as follows:

[0006] A leak-proof pneumatic diaphragm pump comprises a diaphragm pump body, two first connecting pipes are symmetrically arranged on the left and right sides of the diaphragm pump body, a feed pipe and a discharge pipe are symmetrically arranged on the upper and lower sides of the first connecting pipe, and the feed pipe and the discharge pipe are connected through the first connecting pipe, a first containing space is provided in the first connecting pipe, a first diaphragm of the diaphragm pump body is located in the first containing space, a first one-way ball valve is respectively arranged at both ends of the two first connecting pipes, and further comprises:

[0007] A first sliding rod is slidably disposed on the diaphragm pump body, two ends of the first sliding rod are respectively located in the two first containing spaces, the first diaphragm center is disposed at two ends of the first sliding rod, and after the first sliding rod slides, the first diaphragms at two ends of the first sliding rod are extended or contracted;

[0008] A filter plate is arranged in the first containing space. The filter plate is located at one end of the first connecting pipe close to the feed pipe. The filter plate is used to filter solids in the liquid. The first diaphragm does not contact the filter plate after being stretched.

[0009] Optionally, it also includes:

[0010] The second connecting pipe has two ends respectively connected with the first containing space and the discharge pipe, the end of the second connecting pipe connected with the first containing space is located on the side of the filter plate close to the feed pipe, and the end of the second connecting pipe connected with the first containing space is located between the filter plate and the first one-way ball valve.

[0011] Optionally, it also includes:

[0012] The second one-way ball valve is arranged at one end of the second connecting pipe close to the discharge pipe, and the second one-way ball valve is used to prevent the liquid in the discharge pipe from entering the second connecting pipe.

[0013] Optionally, the feed pipe is located below the diaphragm pump body, and the discharge pipe is located above the diaphragm pump body.

[0014] Optionally, the filter plate is arranged obliquely relative to the diaphragm pump body, and an end of the filter plate close to the first diaphragm is closer to the ground than an end of the filter plate away from the first diaphragm.

[0015] Optionally, it also includes:

[0016] The diaphragm valve is arranged in the first connecting pipe and is located at one end of the first connecting pipe close to the feeding pipe. The diaphragm valve is located between the connection point between the second connecting pipe and the first containing space and the first one-way ball valve close to the feeding pipe. The diaphragm valve is used to block or open the first connecting pipe when opened or closed.

[0017] Optionally, the diaphragm pump body has a mounting groove, the mounting groove is communicated with the first containing space, and the diaphragm valve comprises:

[0018] A valve body, one end of which is located in the first containing space, and the other end of which is located in the mounting groove, wherein the end of the valve body located in the first containing space has a valve flap;

[0019] A second sliding rod is slidably arranged on the valve body. After the second sliding rod slides, it approaches or moves away from the valve flap. One end of the second sliding rod has a second diaphragm. After the second sliding rod slides close to the valve flap, the second diaphragm abuts against the valve flap and closes the valve body.

[0020] Optionally, the second sliding rod has a sliding portion at one end away from the second diaphragm, and the sliding portion slides in a sealed manner with the mounting groove. The diaphragm pump body has a first air inlet and a first air outlet, and the first air inlet and the first air outlet are both connected to the interior of the mounting groove. The first air inlet is used to introduce compressed air into the interior of the mounting groove, and the first air outlet is used to discharge the compressed air in the mounting groove. The first air inlet and the first air outlet are both located on a side of the sliding portion away from the valve body, and further comprises:

[0021] The first elastic member has two ends respectively arranged on the inner wall of the mounting groove and the sliding part, and the first elastic member is used to provide a force for the sliding part to slide away from the valve body.

[0022] Optionally, it also includes:

[0023] The baffle is arranged on the sliding part, and after the sliding part drives the baffle to slide, the baffle closes or opens the first air outlet.

[0024] Optionally, after the sliding portion slides away from the valve body, the baffle closes the first air outlet, and the first air outlet is connected to the driving device of the first sliding rod.

[0025] The working principle and beneficial effects of the present invention are:

[0026] In the present invention, the first connecting tubes on the left and right sides of the diaphragm pump body have a first containing space, and the first sliding rod slides to drive the first diaphragm to alternately extend or contract in the two first containing spaces of the two first connecting tubes. After the first diaphragm extends, the first one-way ball valve close to the feed pipe is closed, the first one-way ball valve close to the discharge pipe is opened, and the liquid in the first containing space is pressed into the discharge pipe. After the first diaphragm contracts, the first one-way ball valve close to the feed pipe is opened, the first one-way ball valve close to the discharge pipe is closed, and the liquid in the feed pipe is sucked into the first containing space.

[0027] A filter plate is carefully arranged at one end of the first connecting pipe near the feed pipe. The pore size of the filter screen is accurately calculated to effectively filter out most of the solids in the material and prevent the solids from contacting the first diaphragm and causing damage to the first diaphragm. At the same time, the filter plate can be fixed in the first connecting pipe by welding or fixed to the inner wall of the first connecting pipe by bolts to prevent the filter plate from loosening or shifting under the impact of the liquid.

[0028] The two ends of the first sliding rod are precisely located in the two first containing spaces, and the center of the first diaphragm is fixed to the two ends of the first sliding rod by strong rivets. When the first sliding rod slides under the action of the external pneumatic drive device, the first diaphragms at both ends of the first sliding rod will expand or contract accordingly. During the expansion of the first diaphragm, since the filter plate is located close to the feed pipe, the first diaphragm will not come into contact with the filter plate, thereby preventing the solid stuck on the filter plate from damaging the filter plate and causing leakage of the diaphragm pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0030] Figure 1 It is a schematic diagram of the structure of the present invention;

[0031] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention;

[0032] Figure 3 For the present invention Figure 2 Enlarged structural diagram at A in the middle.

[0033] In the figure: 100, diaphragm pump body, 200, first connecting pipe, 300, feed pipe, 400, discharge pipe, 210, first containing space, 110, first diaphragm, 220, first one-way ball valve, 120, first sliding rod, 500, filter plate, 600, second connecting pipe, 610, second one-way ball valve, 700, diaphragm valve, 130, mounting groove, 710, valve body, 720, valve disc, 730, second sliding rod, 740, second diaphragm, 731, sliding part, 131, first air inlet, 132, first air outlet, 800, first elastic member, 732, baffle. DETAILED DESCRIPTION

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0035] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0036] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0038] Reference Figure 1~Figure 3 The present invention proposes a leak-proof pneumatic diaphragm pump, including a diaphragm pump body 100, two first connecting pipes 200 are symmetrically arranged on the left and right sides of the diaphragm pump body 100, a feed pipe 300 and a discharge pipe 400 are symmetrically arranged on the upper and lower sides of the first connecting pipe 200, and the feed pipe 300 and the discharge pipe 400 are connected through the first connecting pipe 200, a first containing space 210 is provided in the first connecting pipe 200, a first diaphragm 110 of the diaphragm pump body 100 is located in the first containing space 210, a first one-way ball valve 220 is respectively arranged at both ends of the two first connecting pipes 200, and further includes The first sliding rod 120 is slidably arranged on the diaphragm pump body 100, and the two ends of the first sliding rod 120 are respectively located in the two first containing spaces 210, and the center of the first diaphragm 110 is arranged at the two ends of the first sliding rod 120. After the first sliding rod 120 slides, the first diaphragms 110 at the two ends of the first sliding rod 120 stretch or shrink; the filter plate 500 is arranged in the first containing space 210, and the filter plate 500 is located at one end of the first connecting pipe 200 close to the feed pipe 300. The filter plate 500 is used to filter the solids in the liquid, and the first diaphragm 110 does not contact the filter plate 500 after stretching.

[0039] In this embodiment, the first connecting tubes 200 on the left and right sides of the diaphragm pump body 100 have first containing spaces 210, and the first sliding rod 120 slides to drive the first diaphragm 110 to alternately extend or contract in the two first containing spaces 210 of the two first connecting tubes 200. After the first diaphragm 110 extends, the first one-way ball valve 220 near the feed pipe 300 is closed, and the first one-way ball valve 220 near the discharge pipe 400 is opened, and the liquid in the first containing space 210 is pressed into the discharge pipe 400. After the first diaphragm 110 contracts, the first one-way ball valve 220 near the feed pipe 300 is opened, and the first one-way ball valve 220 near the discharge pipe 400 is closed, and the liquid in the feed pipe 300 is sucked into the first containing space 210.

[0040] A filter plate 500 is carefully arranged at one end of the first connecting pipe 200 near the feed pipe 300. The pore size of the filter screen is accurately calculated, which can effectively filter out most of the solids in the material and prevent the solids from contacting the first diaphragm 110 and causing damage to the first diaphragm 110. At the same time, the filter plate 500 can be fixed in the first connecting pipe 200 by welding, or fixed to the inner wall of the first connecting pipe 200 by bolts to prevent the filter plate 500 from loosening or shifting under the impact of the liquid.

[0041] The two ends of the first sliding rod 120 are precisely located in the two first containing spaces 210, respectively, and the center of the first diaphragm 110 is fixed to the two ends of the first sliding rod 120 by strong rivets. When the first sliding rod 120 slides under the action of the external pneumatic drive device, the first diaphragms 110 at the two ends of the first sliding rod 120 will expand or contract accordingly. During the expansion of the first diaphragm 110, since the filter plate 500 is located near the feed pipe 300, the first diaphragm 110 will not come into contact with the filter plate 500, thereby preventing the solid stuck on the filter plate 500 from damaging the filter plate 500, thereby causing leakage of the diaphragm pump.

[0042] Furthermore, two ends of a second connecting pipe 600 are respectively connected to the first containing space 210 and the discharge pipe 400 , and one end of the second connecting pipe 600 connected to the first containing space 210 is located on a side of the filter plate 500 close to the feed pipe 300 .

[0043] In this embodiment, both ends of the second connecting tube 600 are connected to the first holding space 210 and the discharge pipe 400 respectively. The end of the second connecting tube 600 connected to the first holding space 210 is located on the side of the filter plate 500 close to the feed pipe 300. After the liquid in the feed pipe 300 enters the first holding space 210, due to the presence of the filter plate 500, the solids in the liquid will stay on the side of the filter plate 500 close to the feed pipe 300. When the solids in the liquid are not impurities, when the first diaphragm 110 stretches, part of the liquid in the first holding space 210 flows from the second connecting tube 600 to the discharge pipe 400, and this part of the liquid will take away from the first holding space 210 together with the solids intercepted by the filter plate 500, and enter the discharge pipe 400 to be transported together with the rest of the liquid.

[0044] The ratio of the diameter of the second connecting tube 600 to the diameter of the first connecting tube 200 should be greater than 3:1 to prevent most of the liquid from passing through the second connecting tube 600.

[0045] Another embodiment is that when the solid in the liquid is an impurity, the other end of the first connecting pipe 200 is connected to the impurity collection box, and when the first diaphragm 110 is stretched, a small amount of liquid can be used to take the impurities out of the first containing space 210, thereby preventing the impurities from entering the discharge pipe 400. It should be noted that the height of the impurity collection box in this embodiment should not be less than the height of the discharge pipe 400, so that the liquid in the first rice containing space can enter the discharge pipe 400 more easily.

[0046] Furthermore, a second one-way ball valve 610 is provided at one end of the second connecting pipe 600 close to the discharge pipe 400 , and the second one-way ball valve 610 is used to prevent the liquid in the discharge pipe 400 from entering the second connecting pipe 600 .

[0047] In this embodiment, a second one-way ball valve 610 is provided at one end of the second connecting pipe 600 close to the drain pipe, and the second one-way ball valve 610 can prevent the liquid in the drain pipe from entering the second connecting pipe 600. When the first diaphragm 110 contracts, the second one-way ball valve 610 can be closed to ensure that only the first one-way ball valve 220 at one end of the first containing space 210 close to the feed pipe 300 is open, thereby preventing gas or liquid from entering the first containing space 210 from the end of the second connecting pipe 600 far from the first containing space 210, thereby affecting the liquid absorption amount of the first containing space 210.

[0048] Furthermore, the feed pipe 300 is located below the diaphragm pump body 100 , and the discharge pipe 400 is located above the diaphragm pump body 100 .

[0049] In this embodiment, the feed pipe 300 is located below the diaphragm pump body 100, and the discharge pipe 400 is located above the diaphragm pump body 100. When the first diaphragm 110 contracts and the liquid enters the first containing space 210 from the feed pipe 300, the solids in the liquid are blocked on one side of the filter plate 500 and will not enter the cavity where the first diaphragm 110 is located. After the first diaphragm 110 stops stretching, the solids blocked by the filter plate 500 will move away from the filter plate 500 under the action of gravity, preventing excessive accumulation from causing blockage of the filter plate 500. Moreover, when the solids are stuck in the filter holes in the filter plate 500, they need to overcome gravity to reduce the probability of the solids being stuck in the filter holes of the filter plate 500. When the first diaphragm 110 stretches, it pushes the liquid to flush the filter plate in the opposite direction. Even if there are solid particles stuck in the filter holes of the filter plate 500, they will move away from the filter plate 500 under the dual action of the liquid impact force and gravity, preventing the filter holes of the filter plate 500 from being blocked and affecting the head of the diaphragm pump.

[0050] Furthermore, the filter plate 500 is tilted relative to the diaphragm pump body 100 , and an end of the filter plate 500 close to the first diaphragm 110 is closer to the ground than an end of the filter plate 500 far from the first diaphragm 110 .

[0051] In this embodiment, the filter plate 500 is tilted relative to the diaphragm body to increase the contact area between the filter plate 500 and the liquid. When the first diaphragm 110 contracts, the filter plate 500 blocks the solids in the liquid, reducing the probability of local blockage of the filter plate 500.

[0052] Furthermore, it also includes a diaphragm valve 700 arranged in the first connecting pipe 200, located at one end of the first connecting pipe 200 close to the feed pipe 300, and the diaphragm valve 700 is located between the connection between the second connecting pipe 600 and the first connecting pipe 200 and the first one-way ball valve 220 close to the feed pipe 300. The diaphragm valve 700 is used to block or open the first connecting pipe 200 after being opened or closed.

[0053] In this embodiment, the diaphragm valve 700 and the first one-way ball valve 220 together play the role of opening or closing the first connecting pipe 200. The diaphragm valve 700 can serve as a safety for the first one-way ball valve 220 to block the first connecting pipe 200, thereby reducing the probability of liquid leakage due to long-term use of the first one-way ball valve 220 or the diaphragm valve 700.

[0054] When the first diaphragm 110 is extended, the first one-way ball valve 220 and the diaphragm valve 700 near the feed pipe 300 in the first connecting pipe 200 are closed, so that a closed space is formed between the first one-way ball valve 220 and the diaphragm valve 700 near the feed pipe 300, thereby preventing all solids blocked by the filter plate 500 from entering the channel of the first one-way ball valve 220 under the action of the pressure of the first diaphragm 110, thereby affecting the normal use of the first one-way ball valve 220.

[0055] The diaphragm valve 700 has strong corrosion resistance, which matches the scenario where the diaphragm pump is often used to transport corrosive liquids.

[0056] Furthermore, the diaphragm pump body 100 has an installation groove 130, which is connected to the first containing space 210. The diaphragm valve 700 includes a valve body 710, one end of which is located in the first containing space 210, and the other end is located in the installation groove 130. The end of the valve body 710 located in the first containing space 210 has a valve flap 720; a second sliding rod 730 is slidably arranged on the valve body 710, and the second sliding rod 730 slides close to or away from the valve flap 720. One end of the second sliding rod 730 has a second diaphragm 740. After the second sliding rod 730 slides close to the valve flap 720, the second diaphragm 740 abuts against the valve flap 720 and blocks the first connecting pipe 200.

[0057] In this embodiment, the diaphragm pump body 100 has an installation groove 130, which is connected to the first containing space 210 to facilitate the installation of the diaphragm valve 700. The valve body 710 of the diaphragm valve 700 is located in the first containing space 210 to facilitate the blocking or opening of the first connecting pipe 200. The second sliding rod 730 is slidably set on the valve body 710. The second sliding rod 730 controls the second diaphragm 740 to approach or move away from the valve disc 720 by sliding, thereby controlling the diaphragm valve 700 to open or block the first connecting pipe 200.

[0058] Furthermore, the second sliding rod 730 has a sliding portion 731 at one end away from the second diaphragm 740, and the sliding portion 731 is sealed and slidable with the mounting groove 130. The diaphragm pump body 100 has a first air inlet 131 and a first air outlet 132. The first air inlet 131 and the first air outlet 132 are both connected to the interior of the mounting groove 130. The first air inlet 131 is used to introduce compressed air into the interior of the mounting groove 130, and the first air outlet 132 is used to discharge the compressed air in the mounting groove 130. The first air inlet 131 and the first air outlet 132 are both located on the side of the sliding portion 731 away from the valve body 710. It also includes a first elastic member 800, both ends of which are respectively arranged on the inner wall of the mounting groove 130 and the sliding portion 731. The first elastic member 800 is used to provide a force for the sliding portion 731 to slide away from the valve body 710.

[0059] In this embodiment, the second sliding rod 730 has a sliding portion 731 at one end away from the second diaphragm 740, and the sliding portion 731 slides in a sealed manner with the mounting groove 130. The compressed air from the external air source can first enter the mounting groove 130 through the first air inlet 131, and then enter the driving chamber of the first sliding rod 120 from the first air outlet 132. The compressed air generates pressure when driving the first sliding rod 120 to slide. The pressure at this time can push the sliding portion 731 of the second sliding rod 730 to slide, so that the second sliding rod 730 drives the second diaphragm 740 to abut against the valve flap 720, so that the diaphragm valve 700 is in a closed state.

[0060] When the first diaphragm 110 contracts, compressed air needs to be introduced into the other side of the second sliding rod 730. The second sliding rod 730 on the other side also slides synchronously with the first sliding rod 120. Since the compressed air is stopped from being introduced into the second sliding rod 730 located on the contraction side of the first diaphragm 110, the sliding part 731 will, under the action of the first elastic member 800, drive the second sliding rod 730 to slide away from the valve flap 720, thereby opening the diaphragm valve 700.

[0061] The first air inlet 131 and the second air inlet in the mounting groove 130 allow compressed air to first pass through the mounting groove 130 and then drive the first sliding rod 120 to slide, thereby linking the opening and closing of the first diaphragm 110 valve with the extension and contraction of the first diaphragm 110 .

[0062] Furthermore, the baffle plate 732 is disposed on the sliding portion 731 , and after the sliding portion 731 drives the baffle plate 732 to slide, the baffle plate 732 closes or opens the first air outlet 132 .

[0063] Furthermore, after the sliding portion 731 slides away from the valve body 710 , the baffle 732 closes the first air outlet 132 , and the first air outlet 132 is communicated with the driving device of the first sliding rod 120 .

[0064] In this embodiment, the baffle 732 is arranged on the sliding part 731, and the sliding part 731 can drive the baffle 732 to slide. After the baffle 732 slides, it opens or closes the first air outlet 132. Before compressed air is introduced into the first air inlet 131, due to the action of the first elastic member 800, the baffle 732 is in a state of closing the first air outlet 132. When the first sliding rod 120 needs to slide, when air is introduced into the mounting groove 130 through the first air inlet 131, the compressed air first pushes the pushing part to slide, so that the diaphragm valve 700 is closed, and then drives the first sliding rod 120 to slide, so as to avoid the diaphragm valve 700 not being in a completely closed state when the first diaphragm 110 is stretched, resulting in a decrease in the effect of the diaphragm valve 700.

[0065] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A leak-proof pneumatic diaphragm pump, comprising a diaphragm pump body (100), wherein two first connecting pipes (200) are symmetrically arranged on the left and right sides of the diaphragm pump body (100), wherein a feed pipe (300) and a discharge pipe (400) are symmetrically arranged on the upper and lower sides of the first connecting pipe (200), and the feed pipe (300) and the discharge pipe (400) are connected through the first connecting pipe (200), wherein a first containing space (210) is provided in the first connecting pipe (200), wherein a first diaphragm (110) of the diaphragm pump body (100) is located in the first containing space (210), and wherein a first one-way ball valve (220) is respectively arranged at both ends of the two first connecting pipes (200), wherein the first one-way ball valve (220) is arranged at the first two ends of the two first connecting pipes (200), wherein the first one-way ball valve (220) is arranged at the first two ends of the two first connecting pipes (200), and ... Also includes: A first sliding rod (120) is slidably disposed on the diaphragm pump body (100), two ends of the first sliding rod (120) are respectively located in the two first containing spaces (210), the center of the first diaphragm (110) is disposed at the two ends of the first sliding rod (120), and after the first sliding rod (120) slides, the first diaphragms (110) at the two ends of the first sliding rod (120) are extended or contracted; a filter plate (500) disposed in the first containing space (210); the filter plate (500) is located at one end of the first connecting pipe (200) close to the feed pipe (300); the filter plate (500) is used to filter solids in the liquid; and the first diaphragm (110) does not contact the filter plate (500) after being stretched; The second connecting pipe (600) has two ends respectively connected to the first containing space (210) and the discharge pipe (400); the end of the second connecting pipe (600) connected to the first containing space (210) is located on a side of the filter plate (500) close to the feed pipe (300); and the end of the second connecting pipe (600) connected to the first containing space (210) is located between the filter plate (500) and the first one-way ball valve (220).

2. A leak-proof pneumatic diaphragm pump according to claim 1, characterized in that: Also includes: The second one-way ball valve (610) is arranged at one end of the second connecting pipe (600) close to the discharge pipe (400), and the second one-way ball valve (610) is used to prevent liquid in the discharge pipe (400) from entering the second connecting pipe (600).

3. A leak-proof pneumatic diaphragm pump according to claim 1, characterized in that: The feed pipe (300) is located below the diaphragm pump body (100), and the discharge pipe (400) is located above the diaphragm pump body (100).

4. A leak-proof pneumatic diaphragm pump according to claim 1, characterized in that: The filter plate (500) is arranged tilted relative to the diaphragm pump body (100); an end of the filter plate (500) close to the first diaphragm (110) is closer to the ground than an end of the filter plate (500) far from the first diaphragm (110).

5. The leak-proof pneumatic diaphragm pump according to claim 1, characterized in that: Also includes: The diaphragm valve (700) is arranged in the first connecting pipe (200) and is located at one end of the first connecting pipe (200) close to the feeding pipe (300). The diaphragm valve (700) is located between the connection point between the second connecting pipe (600) and the first containing space (210) and the first one-way ball valve (220) close to the feeding pipe (300). The diaphragm valve (700) is used to block or open the first connecting pipe (200) when opened or closed.

6. A leak-proof pneumatic diaphragm pump according to claim 5, characterized in that: The diaphragm pump body (100) has a mounting groove (130), the mounting groove (130) is in communication with the first containing space (210), and the diaphragm valve (700) comprises: a valve body (710), one end of which is located in the first containing space (210) and the other end of which is located in the mounting groove (130); the end of the valve body (710) located in the first containing space (210) having a valve flap (720); A second sliding rod (730) is slidably arranged on the valve body (710). After the second sliding rod (730) slides, it approaches or moves away from the valve flap (720). One end of the second sliding rod (730) is provided with a second diaphragm (740). After the second sliding rod (730) slides close to the valve flap (720), the second diaphragm (740) abuts against the valve flap (720) and closes the valve body (710).

7. A leak-proof pneumatic diaphragm pump according to claim 6, characterized in that: The second sliding rod (730) has a sliding portion (731) at one end away from the second diaphragm (740), and the sliding portion (731) slides in a sealed manner with the mounting groove (130). The diaphragm pump body (100) has a first air inlet (131) and a first air outlet (132), and the first air inlet (131) and the first air outlet (132) are both connected to the inside of the mounting groove (130). The first air inlet (131) is used to introduce compressed air into the inside of the mounting groove (130), and the first air outlet (132) is used to discharge the compressed air in the mounting groove (130). The first air inlet (131) and the first air outlet (132) are both located on a side of the sliding portion (731) away from the valve body (710), and further comprises: The first elastic member (800) has two ends respectively arranged on the inner wall of the installation groove (130) and the sliding portion (731), and the first elastic member (800) is used to provide a force for the sliding portion (731) to slide away from the valve body (710).

8. A leak-proof pneumatic diaphragm pump according to claim 7, characterized in that: Also includes: The baffle plate (732) is arranged on the sliding portion (731); after the sliding portion (731) drives the baffle plate (732) to slide, the baffle plate (732) closes or opens the first air outlet (132).

9. A leak-proof pneumatic diaphragm pump according to claim 8, characterized in that: After the sliding portion (731) slides away from the valve body (710), the baffle (732) closes the first air outlet (132), and the first air outlet (132) is connected to the driving device of the first sliding rod (120).

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