Automatic operation pneumatic pump

Abstract

The utility model discloses an automatic operation pneumatic pump which comprises a main shell and side shells, the side shells are arranged at the two ends of the main shell, cavities in the middles of the side shells and the main shell jointly form a working cavity, a diaphragm is arranged in the working cavity, a center shaft is matched with the middle of the main shell, and the diaphragm is arranged in the center shaft. The two axial ends of the center shaft are connected with diaphragms located on the left side and the right side of the pneumatic pump respectively, an air valve communicated with the working cavity is arranged in the main shell on the outer side of the center shaft, an air inlet channel is formed in the main shell, a check valve cavity is formed in the side shell on the outer side of the working cavity, and check valves are arranged at the upper end and the lower end of the check valve cavity in a matched mode. The wall faces, located on the outer side of the check valve, of the side shells and the wall faces of the upper end and the lower end of the main shell jointly form fluid channels, the wall faces of the upper side and the lower side of the main shell are provided with connecting openings, the connecting openings are communicated with the fluid channels of the upper side and the lower side of the main shell respectively, after compressed air is input into the air valve, automatic operation can be achieved, the fluid conveying effect is stable, and the sealing performance is good.

Description

TECHNICAL FIELD

[0001] The utility model discloses fluid delivery pump technical field, concretely is a kind of automatic operation pneumatic pump. BACKGROUND

[0002] Pneumatic pump is a new type of pump, it uses compressed air as power source, and for various corrosive liquids, liquid with particles, high viscosity, volatile, flammable, toxic fluid has good transmission effect, so it is applied in semiconductor industry, electronic industry and other industries.

[0003] And part of the existing pneumatic pump needs to be continuously compressed air to deliver to carry out fluid delivery, single delivery compressed air can only carry out fluid delivery once, need to frequently compressed air to deliver to pneumatic pump to realize multiple fluid delivery, when the energy consumption of large flow fluid delivery is needed, and fluid delivery conveying efficiency is low. UTILITY MODEL CONTENTS

[0004] In view of the technical defects in the background art, the utility model provides an automatic operation pneumatic pump, which solves the above technical problems and meets the actual needs, and the specific technical scheme is as follows:

[0005] An automatic operation pneumatic pump, the pneumatic pump includes main shell and side shell, both ends of the main shell are provided with side shell, the side shell and the cavity in the middle of the main shell form a working cavity together, the working cavity is provided with a diaphragm, the middle of the main shell is matched with a center shaft, the two axial ends of the center shaft are connected with the diaphragms on the left and right sides of the pneumatic pump respectively, the main shell outside the center shaft is provided with a gas valve communicated with the working cavity, the main shell is provided with an air inlet channel communicated with the space outside the pneumatic pump, the space inside the main shell where the center shaft is located and the space inside the main shell where the gas valve is located, the side shell outside the working cavity is provided with a check valve cavity, the upper and lower ends of the check valve cavity are matched with check valves, the wall surface outside the check valve of the side shell and the wall surface of the upper and lower ends of the main shell form a fluid channel together, the wall surface of the upper and lower sides of the main shell is provided with a connecting port, and the connecting port is communicated with the fluid channel of the upper and lower sides of the main shell respectively.

[0006] As a further implementation form of the utility model, the air valve includes a first valve body, a first valve core and a first valve cover, the first valve body is provided with a plurality of air holes in the axial direction, the air inlet channel is communicated with the first cavity at the outer side of the middle part of the first valve body through the air hole, the first valve cover is connected with the axial end of the first valve body through the threaded cooperation, the first valve core is matched in the second cavity in the first valve body and slides in the second cavity, the middle part of the first valve core is provided with a connecting shaft through the first matching hole, the middle part of the first valve cover is provided with a second matching hole for matching the connecting shaft, the diameter of the first valve core is same with the diameter of the second cavity, the middle part of the first valve core is provided with a recess communicated with the first cavity, the main shell wall surface outside the both sides of the first cavity is provided with a third cavity communicated with the working cavity.

[0007] As a further implementation form of the utility model, the end of the first valve cover close to the first valve core is provided with a protrusion, the both ends of the first valve core in the axial direction are provided with a first matching groove for matching the protrusion.

[0008] As a further implementation form of the utility model, the side wall of the first valve body, the side wall of the first valve core, the first valve core wall surface outside the first matching hole, the first valve cover wall surface outside the second matching hole and the wall surface of the protrusion away from the second matching hole are all provided with a groove body, the first sealing ring is arranged between the first valve cover and the first valve body and in the groove body.

[0009] As a further implementation form of the utility model, the main shell wall surface at the end of the air inlet channel is provided with a third matching hole, the third matching hole is matched with a silencer.

[0010] As a further implementation form of the utility model, the check valve includes a valve seat, a second valve cover and a second valve core, the side shell wall surface outside the check valve cavity is provided with an internal thread section, the outer wall of the valve seat is provided with a first external thread, the valve seat is fixedly connected in the space of the check valve cavity close to the working cavity through the cooperation between the first external thread and the internal thread section, the outer wall of the second valve cover is provided with a second external thread, the second valve cover is fixedly connected with the side shell wall surface outside the valve seat through the cooperation between the second external thread and the internal thread section, the second valve core is arranged in the middle space of the check valve cavity close to the working cavity of the valve seat, the middle space of the check valve cavity outside the second valve core is provided with a limiting column, the limiting column at the bottom end of the check valve cavity is horizontally arranged, and the limiting column at the top end of the check valve cavity is vertically arranged.

[0011] As a further embodiment of the utility model, the middle part of the main shell is matched with a plurality of annularly distributed connecting columns, the connecting columns penetrate the side shell and fixedly connect the side shell to the main shell, the connecting columns penetrate the diaphragm, the axial end of the connecting column penetrating outside the side shell is located in the first annular groove provided on the end face of the side shell, the first annular groove is provided with a pad plate penetrated by the connecting column, the axial end of the connecting column penetrating outside the pad plate is matched with a nut, and the first annular groove outside the pad plate is matched with a sealing plate.

[0012] As a further embodiment of the utility model, the wall surface of the side shell outside the working cavity is provided with a second annular groove, the wall surface of the main shell outside the working cavity is provided with an annular flange, the edge part of the diaphragm is compressed in the second annular groove by the flange, and the part of the diaphragm outside the second annular groove is compressed between the end face of the main shell and the end face of the side shell.

[0013] As a further embodiment of the utility model, the end face of the main shell outside the fluid channel and the end face of the side shell outside the check valve cavity are both provided with grooves, the two grooves in the position of the main shell and the side shell are in opposite and are butted to form a second matching groove, the first matching groove is matched with a positioning ring, and the groove outside the positioning ring is provided with a second sealing ring.

[0014] As a further embodiment of the utility model, the wall surface of the top end of the main shell is recessed inward to form a hand holding position.

[0015] The pneumatic pump is provided with the air inlet channel, the check valve, the diaphragm, the connecting column, the pad plate, the nut, the sealing plate, the second annular groove, the flange, the positioning ring and the second sealing ring, so that the compressed air is input into the working cavities on both sides of the pneumatic pump to make the diaphragm vibrate, the two diaphragms are connected by the central shaft, the check valves on the upper and lower sides of the two ends of the pneumatic pump control the outflow of the fluid in the working cavities, the reciprocating fluid pumping structure is formed on both sides of the pneumatic pump, the fluid is automatically transported, the fluid transportation effect of the pneumatic pump is stable, and the sealing performance is good. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the external structure diagram of the pneumatic pump Figure 1 .

[0017] Figure 2 It is the external structure diagram of the pneumatic pump Figure 2 .

[0018] Figure 3 It is the structure diagram of the bottom of the pneumatic pump.

[0019] Figure 4 It is Figure 3 The schematic view of A-A direction.

[0020] Figure 5For Figure 3 schematic view of the B-B direction.

[0021] Figure 6 For Figure 3 schematic view of the C-C direction.

[0022] Figure 7 For Figure 6 schematic view of the D part.

[0023] Figure 8 For Figure 6 schematic view of the E part.

[0024] Figure 9 For Figure 6 schematic view of the F part.

[0025] Figure 10 schematic view of the position of the air valve in the main shell.

[0026] Figure 11 schematic view of the external structure of the air valve.

[0027] Figure 12 schematic view of the components of the air valve.

[0028] Figure 13 schematic view of the distribution of the connecting column at the end face of the side shell.

[0029] In the figure, 1, the main shell; 11, the air inlet channel; 111, the third matching hole; 12, the connecting port; 13, the third cavity; 14, the muffler; 15, the connecting column; 16, the convex edge; 2, the side shell; 21, the first annular groove; 22, the pad; 23, the nut; 24, the sealing plate; 25, the second annular groove; 3, the working cavity; 4, the diaphragm; 5, the center shaft; 6, the air valve; 61, the first valve body; 611, the air hole; 612, the first cavity; 613, the second cavity; 62, the first valve core; 621, the first matching hole; 622, the recess; 623, the first matching groove; 63, the first valve cover; 631, the second matching hole; 632, the protrusion; 64, the connecting shaft; 65, the groove body; 66, the first sealing ring; 7, the check valve cavity; 71, the internal thread section; 8, the check valve; 81, the valve seat; 811, the first external thread; 82, the second valve cover; 821, the second external thread; 83, the second valve core; 84, the limiting column; 9, the fluid channel; 10, the second matching groove; 101, the groove; 102, the positioning ring; 103, the second sealing ring; 104, the hand holding position. DETAILED DESCRIPTION

[0030] The utility model discloses an automatic operation pneumatic pump, like Figures 1-6In combination with the shown, the pneumatic pump comprises a main shell 1 and a side shell 2, the two ends of the main shell 1 are provided with the side shell 2, the side shell 2 and the cavity in the middle of the main shell 1 together form a working chamber 3, the working chamber 3 is provided with a diaphragm 4, the middle of the main shell 1 is matched with a center shaft 5, the two axial ends of the center shaft 5 are respectively connected with the diaphragms 4 located on the left and right sides of the pneumatic pump, the outer side of the center shaft 5 is provided with a gas valve 6 in the main shell 1, the gas valve 6 is communicated with the working chamber 3, the main shell 1 is provided with an air inlet channel 11 which is communicated with the space outside the pneumatic pump, the space in the main shell 1 where the center shaft 5 is located and the space in the main shell 1 where the gas valve 6 is located, the side shell 2 outside the working chamber 3 is provided with a check valve cavity 7, the upper and lower ends of the check valve cavity 7 are matched with check valves 8, the wall surface of the side shell 2 outside the check valve 8 and the wall surface of the upper and lower ends of the main shell 1 together form a fluid channel 9, the wall surface of the upper and lower sides of the main shell 1 is provided with a connecting port 12, the connecting port 12 is respectively communicated with the fluid channel 9 on the upper and lower sides of the main shell 1.

[0031] It should be noted that: the air inlet channel 11 is connected with the gas transmission device (not shown in the figure) in the outside world to transmit compressed air, after the compressed air is input to the gas valve 6 through the air inlet channel 11, the compressed air will enter the working chamber 3 on both sides of the pneumatic pump through the gas valve 6 to make the diaphragm 4 excited; then in combination with the connection of the center shaft 5 to the two diaphragms 4, when the compressed air enters one of the working chambers 3, the diaphragm 4 in the working chamber 3 will be squeezed by the compressed air and bulge away from the gas valve 6, so as to make the check valves 8 on the upper and lower sides of one end of the pneumatic pump work, one of the check valves 8 prevents the fluid in one of the fluid channels 9 from entering the working chamber 3 on that side, and the other check valve 8 connects the working chamber 3 on that side with the other fluid channel 9, so that the fluid in the working chamber 3 on that side flows into the other fluid channel 9, and the fluid is pumped out to the container or equipment connected with the connecting port 12 through the other fluid channel 9; at the same time, the diaphragm 4 in the other working chamber 3 will bulge towards the gas valve 6, so as to make the check valves 8 on the upper and lower sides of the other end of the pneumatic pump work, one of the check valves 8 on the side of the pneumatic pump controls the communication between the working chamber 3 and the fluid channel 9, so that the fluid in the fluid channel 9 enters the working chamber 3 on that side, while the other check valve 8 on the side of the pneumatic pump prevents the fluid in the working chamber 3 on that side from entering the other fluid channel 9, so as to form a reciprocating fluid pressure and pumping structure on both sides of the pneumatic pump, thereby automatically realizing the delivery of the fluid, any one of the connecting ports 12 can be used as an input port or an output port, the main shell 1 and the side shell 2 are made of PE or PTFE material, the diaphragm 4 is made of PTFE / EPDM composite material, EPDM or NBR material, and the gas valve 6 is made of polyethylene polymer material or PET material, and the pneumatic pump has stable fluid delivery effect and good sealing performance.

[0032] It needs to be further explained that, as Figure 6 、 Figure 7 、 Figure 10 and Figure 11 shown in combination, the air valve 6 includes a first valve body 61, a first valve core 62 and a first valve cover 63, the first valve body 61 is provided with a plurality of air holes 611 in its axial direction, the air inlet channel 11 is communicated with the first cavity 612 at the outer side of the middle part of the first valve body 61 through the air hole 611, the first valve cover 63 is connected to the axial end of the first valve body 61 by thread cooperation, the first valve core 62 is fitted in the second cavity 613 in the first valve body 61 and slides in the second cavity 613, the middle part of the first valve core 62 is provided with a connecting shaft 64 through the first fitting hole 621, the middle part of the first valve cover 63 is provided with a second fitting hole 631 for fitting the connecting shaft 64, the diameter of the first valve core 62 is the same as the diameter of the second cavity 613, the middle part of the first valve core 62 is provided with a ring of recesses 622 communicated with the first cavity 612, the wall surface of the main shell 1 outside the first cavity 612 is provided with a third cavity 13 communicated with the working chamber 3.

[0033] Among them, the compressed air in the air inlet channel 11 enters the second cavity 613 where the recesses 622 are located after passing through the first cavity 612, after the compressed air enters the second cavity 613 where the recesses 622 are located, the first valve core 62 is pushed to slide in the second cavity 613, when the second cavity 613 where the recesses 622 are located moves to the outside of the third cavity 13, the compressed air enters the third cavity 13 through the air hole 611 on the first valve body 61 outside the third cavity 13, and the compressed air entering the third cavity 13 enters the working chamber 3 close to the side of the air valve 6, so that the diaphragm 4 bulges away from the air valve 6, and then pushes the check valve 8 to work to realize the communication or blocking action between the working chamber 3 and the fluid channel 9.

[0034] Specifically, as Figure 6 and Figure 7 shown in combination, the end of the first valve cover 63 close to the first valve core 62 is provided with a protrusion 632, and the two ends of the first valve core 62 in the axial direction are provided with a first fitting groove 623 for cooperating with the protrusion 632.

[0035] Among them, when the protrusion 632 is fitted into the first fitting groove 623, the first valve core 62 can slide more smoothly in the second cavity 613, avoiding the situation that the first valve core 62 is stuck due to position deviation when sliding.

[0036] More specifically, as Figure 7As shown, the side wall of the first valve body 61, the side wall of the first valve core 62, the wall surface of the first valve core 62 outside the first matching hole 621, the wall surface of the first valve cover 63 outside the second matching hole 631, and the wall surface of the protrusion 632 away from the side of the second matching hole 631 are all provided with a groove 65, and the first sealing ring 66 is arranged between the first valve cover 63 and the first valve body 61 and in the groove 65.

[0037] The first sealing ring 66 can maintain the sealing of the connection position between the components of the gas valve 6 and the connection position between the gas valve 6 and the main shell 1.

[0038] It should be further explained that, as Figure 2 and Figure 5 As shown, the wall surface of the main shell 1 at the end of the air inlet channel 11 is provided with a third matching hole 111, and the muffler 14 is matched in the third matching hole 111.

[0039] The muffler 14 can reduce the noise generated by the air inlet channel 11 when it is depressurized.

[0040] It should be further explained that, as Figure 4 and Figure 12 As shown, the check valve 8 includes a valve seat 81, a second valve cover 82, and a second valve core 83. The wall surface of the side shell 2 outside the check valve cavity 7 is provided with an internally threaded section 71. The outer wall of the valve seat 81 is provided with a first external thread 811. The valve seat 81 is fixedly connected in the space of the check valve cavity 7 near the working cavity 3 by matching the first external thread 811 with the internally threaded section 71. The outer wall of the second valve cover 82 is provided with a second external thread 821. The second valve cover 82 is fixedly connected to the wall surface of the side shell 2 outside the valve seat 81 by matching the second external thread 821 with the internally threaded section 71. The second valve core 83 is arranged in the middle space of the check valve cavity 7 near the working cavity 3 of the valve seat 81. The middle space of the check valve cavity 7 outside the second valve core 83 is provided with a limiting column 84. The limiting column 84 at the bottom end of the check valve cavity 7 is arranged horizontally, and the limiting column 84 at the top end of the check valve cavity 7 is arranged vertically.

[0041] When the diaphragm 4 is inflated in the direction away from the air valve 6, the second valve core 83 at the top of the side shell 2 is pressed against the valve seat 81, thereby closing the hole in the middle of the valve seat 81 to block the fluid in the fluid passage 9 from entering the working cavity 3 through the check valve cavity 7 at the top of the side shell 2; at the same time, the second valve core 83 at the bottom of the side shell 2 is pressed out of the hole in the middle of the valve seat 81 to a position between the valve seat 81 and the limiting column 84, so that the fluid passage 9 at the bottom of the pneumatic pump is connected with the working cavity 3, thereby pumping the fluid in the working cavity 3 out of the bottom of the pneumatic pump to the outside; similarly, when the diaphragm 4 is inflated in the direction close to the air valve 6, the working cavity 3 is connected with the fluid passage 9 through the check valve 8 at the top of the side shell 2, and the working cavity 3 is closed by the check valve 8 at the bottom of the side shell 2, thereby introducing the fluid into the working cavity 3; in addition, when the valve seat 81 and the second valve core 83 need to be replaced, the limiting column 84 for limiting the second valve core 83 can be disassembled, so that the valve seat 81 and the second valve core 83 can be disassembled from the side shell 2, thereby achieving the replacement of the valve seat 81 and the second valve core 83, and the operation of replacing the valve seat 81 and the second valve core 83 is simple and convenient.

[0042] It should be further pointed out that, as Figure 4 , Figure 8 , Figure 9 and Figure 13 shown in combination, the middle of the main shell 1 is matched with a plurality of annularly distributed connecting columns 15, the connecting columns 15 penetrate the side shell 2 and fixedly connect the side shell 2 to the main shell 1, the connecting columns 15 penetrate the diaphragm 4, the axial end of the connecting column 15 penetrating outside the side shell 2 is located in the first annular groove 21 provided on the end face of the side shell 2, the first annular groove 21 is provided with a pad 22 penetrated by the connecting column 15, the axial end of the connecting column 15 penetrating outside the pad 22 is matched with a nut 23, and the first annular groove 21 outside the pad 22 is matched with a sealing plate 24.

[0043] The main shell 1 and the side shell 2 are connected by the plurality of connecting columns 15, the nut 23 is matched to the end of the connecting column 15, the side shell 2 is fixed to the two sides of the main shell 1, the entire shell of the pneumatic pump forms a tight whole, the connecting column 15 can penetrate the edge of the diaphragm 4, thereby fixing the position of the diaphragm 4 by the plurality of connecting columns 15, and the sealing plate 24 is matched in the first annular groove 21, which not only avoids the position where the nut 23 is matched with the connecting column 15 from being exposed to the outside to affect the connection tightness of the entire shell of the pneumatic pump, but also avoids the fluid from leaking out of the position where the connecting column 15 penetrates the main shell 1 and the side shell 2 to the outside.

[0044] Specifically, asFigure 9 As shown in the figure, the wall surface of the side shell 2 outside the working cavity 3 is provided with a second annular groove 25, the wall surface of the main shell 1 outside the working cavity 3 is provided with an annular flange 16, the edge portion of the diaphragm 4 is pressed in the second annular groove 25 by the flange 16, and the portion of the diaphragm 4 outside the second annular groove 25 is pressed between the end surface of the main shell 1 and the end surface of the side shell 2.

[0045] Wherein, when the nut 23 is fitted to the end of the connecting column 15 and the side shell 2 is pressed to the end surface of the main shell 1, the portion of the diaphragm 4 outside the connecting column 15 is extruded into the second annular groove 25 by the flange 16, and the portion of the diaphragm 4 outside the connecting column 15 is pressed between the end surface of the main shell 1 and the end surface of the side shell 2, thereby positioning the portion of the diaphragm 4 outside the connecting column 15, further fixing the position of the diaphragm 4, and also sealing the gap between the end surface of the main shell 1 and the end surface of the side shell 2 by the softness of the diaphragm 4, further improving the sealing performance of the air pump.

[0046] It needs to be further explained that, as shown in the figure, Figure 4 As shown in the figure, the end surface of the main shell 1 outside the fluid passage 9 and the end surface of the side shell 2 outside the check valve cavity 7 are both provided with a groove 101, the two grooves 101 opposite to each other in the main shell 1 and the side shell 2 are butted to form a second matching groove 10, the first matching groove 623 is matched with a positioning ring 102, and the groove 101 outside the positioning ring 102 is provided with a second sealing ring 103.

[0047] Wherein, the positioning ring 102 can facilitate the alignment of the main shell 1 and the side shell 2 during the assembly of the air pump, making the operation of assembling the side shell 2 to the main shell 1 simpler, and the second sealing ring 103 between the positioning ring 102 and the groove 101 can seal the gap at the butting position of the main shell 1 and the side shell 2, avoiding the leakage of fluid from the connection position of the main shell 1 and the side shell 2 to the outside.

[0048] It needs to be further explained that, as shown in the figure, Figure 1 As shown in the figure, the wall surface of the top end of the main shell 1 is recessed inward to form a hand holding position 104.

[0049] Wherein, the hand holding position 14 can help the fingers of people to form a force point on the main shell 1, thereby facilitating people to take the electric pump for carrying.

[0050] Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes every feature or implementation described herein. The specification can include implicit combinations of explicitly mentioned features and / or implicit combinations of implicitly mentioned features. Such combinations are also expressly included within the scope of the specification and an embodiment.

Claims

1. An automatically operating pneumatic pump comprising a main casing and a side casing, both ends of the main casing are provided with the side casing, characterized in that, The cavities in the middle of the side shell and the main shell jointly form a working cavity, a diaphragm is arranged in the working cavity, a central shaft is arranged in the middle of the main shell, two axial ends of the central shaft are connected to the diaphragms arranged on the left and right sides of the pneumatic pump respectively, a gas valve communicating with the working cavity is arranged in the main shell outside the central shaft, an air inlet channel is arranged in the main shell and communicates with a space outside the pneumatic pump, a space in the main shell where the central shaft is located and a space in the main shell where the gas valve is located, a check valve cavity is arranged in the side shell outside the working cavity, check valves are arranged at the upper and lower ends of the check valve cavity, the wall surface of the side shell outside the check valves and the wall surfaces of the upper and lower ends of the main shell jointly form fluid channels, and the wall surfaces of the upper and lower ends of the main shell are provided with connecting ports which respectively communicate with the fluid channels of the upper and lower ends of the main shell.

2. The air-operated pump of claim 1, wherein The gas valve comprises a first valve body, a first valve core and a first valve cover, the first valve body is provided with a plurality of air holes in the axial direction, the air inlet channel communicates with a first cavity outside the middle of the first valve body through the air holes, the first valve cover is connected to the axial end of the first valve body through thread cooperation, the first valve core is arranged in a second cavity in the first valve body and slides in the second cavity, the middle of the first valve core is provided with a connecting shaft through a first matching hole, the middle of the first valve cover is provided with a second matching hole for matching the connecting shaft, the diameter of the first valve core is the same as the diameter of the second cavity, the middle of the first valve core is provided with a recess which communicates with the first cavity, and the wall surface of the main shell outside the two sides of the first cavity is provided with a third cavity which communicates with the working cavity.

3. The air-operated pump of claim 2, wherein, The end of the first valve cover close to the first valve core is provided with a protrusion, and the two ends of the first valve core in the axial direction are provided with first matching grooves for matching the protrusion.

4. The air-operated pump of claim 3, wherein, The side wall of the first valve body, the side wall of the first valve core, the wall surface of the first valve core outside the first matching hole, the wall surface of the first valve cover outside the second matching hole and the wall surface of the protrusion away from the second matching hole are all provided with groove bodies, and the first valve cover and the first valve body are both provided with first sealing rings between them and in the groove bodies.

5. The air pump of claim 1, wherein, The wall surface of the main shell at the end of the air inlet channel is provided with a third matching hole, and a silencer is arranged in the third matching hole.

6. The air pump of claim 1, wherein, The check valve comprises a valve seat, a second valve cover and a second valve core, the wall surface of the side shell outside the check valve cavity is provided with an internally threaded section, the outer wall of the valve seat is provided with a first external thread, the valve seat is fixedly connected in the space of the check valve cavity close to the working cavity through cooperation between the first external thread and the internally threaded section, the outer wall of the second valve cover is provided with a second external thread, the second valve cover is fixedly connected to the wall surface of the side shell outside the valve seat through cooperation between the second external thread and the internally threaded section, the second valve core is arranged in the middle space of the check valve cavity close to the working cavity of the valve seat, a limiting column is arranged in the middle space of the check valve cavity outside the second valve core, the limiting column at the bottom end of the check valve cavity is horizontally arranged, and the limiting column at the top end of the check valve cavity is vertically arranged.

7. The air pump of claim 1, wherein, The middle part of the main shell is matched with a plurality of annularly distributed connecting columns, the connecting columns penetrate the side shell and fixedly connect the side shell to the main shell, the connecting columns penetrate the diaphragm, the axial end of the connecting columns penetrating outside the side shell is located in a first annular groove arranged on the end face of the side shell, a gasket plate penetrated by the connecting columns is arranged in the first annular groove, the axial end of the connecting columns penetrating outside the gasket plate is matched with a nut, and the first annular groove outside the gasket plate is matched with a sealing plate.

8. The air-operated pump of claim 7, wherein, The wall surface of the side shell outside the working cavity is provided with a second annular groove, the wall surface of the main shell outside the working cavity is provided with an annular flange, the edge part of the diaphragm is pressed into the second annular groove by the flange, and the part of the diaphragm outside the second annular groove is pressed between the end face of the main shell and the end face of the side shell.

9. The air pump of claim 1, wherein, The end face of the main shell outside the fluid channel and the end face of the side shell outside the check valve cavity are both provided with grooves, the two grooves opposite to each other in position of the main shell and the side shell are butted to form a second matching groove, a positioning ring is matched in the second matching groove, and a second sealing ring is arranged in the groove outside the positioning ring.

10. The air pump of claim 1, wherein, The wall surface of the top end of the main shell is recessed inward to form a hand holding position.

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