Non-return limiting structure for corrugated pipe pump and corrugated pipe pump

Abstract

The utility model provides a non-return limiting structure for a corrugated pipe pump and the corrugated pipe pump, and solves the technical problems that a corrugated pipe of a damping part of an existing corrugated pipe pump is stressed unevenly, and liquid outlet of the corrugated pipe is unstable. The first check valve comprises a first valve body, an opening of the first valve body is provided with an edge tightened inwards, and the bottom of the first valve body is provided with a first through hole and a first mounting column. The first valve element is arranged in the first valve body, and the first valve element is provided with a first stop body and a first pipe body; the first pipe body and the first mounting column are sleeved with the first reset spring; the periphery of the first stop body abuts against the inner side of the edge; the second check valve comprises a second valve body, an opening of the second valve body is communicated with the connecting ring, and a second through hole and a second mounting column are arranged at the bottom; the second valve element is arranged in the second valve body and provided with a second stop body and a second pipe body. The second pipe body and the second installation column are sleeved with the second reset spring. The periphery of the second stop body abuts against the connecting ring, and the connecting ring communicates with the bottom of the first valve body. The bellows pump can be widely applied to the technical field of bellows pumps.

Description

Technical Field

[0001] The present application relates to the technical field of bellows pumps, and in particular to a non-return limit structure for a bellows pump and a bellows pump. Background Art

[0002] A bellows pump is a pump that uses the stretching and contraction of a bellows to achieve liquid transportation. It can be used for liquid transportation in technical fields such as semiconductor and liquid crystal product production engineering. The existing bellows pump is mainly composed of a drive unit, a valve core, and a damping unit, including a housing, a valve core, two bellows, and two push plates. A bellows is connected to each side of the valve core, and the other side of the bellows is connected to a push plate. The two push plates are connected by a connecting shaft that runs through the valve core. An air cavity is formed between the housing and the push plate, and the inside of the bellows is connected to the pipeline in the valve core to form a liquid cavity. By alternately introducing compressed gas into the two air cavities of the housing, the push plate drives the bellows to reciprocate and squeeze the liquid cavity in the tube under the drive of air pressure, so that the liquid entering from the valve core liquid inlet is pressed out from the valve core liquid outlet, and the continuous cycle realizes the function of transporting liquid.

[0003] During the operation of the existing bellows pump, the bellows in the liquid chamber of the damping part reciprocates horizontally. Since there is no check limit structure and no horizontal support force, the bellows is unevenly stressed during compression, generating noise and unstable liquid discharge, and even causing technical problems such as bellows damage leading to liquid leakage. There are two main reasons for this: on the one hand, it is very easy for the bellows to be compressed too much, deformed excessively, and contact between adjacent bellows teeth occurs, resulting in uneven stress on the walls of the bellows; on the other hand, it is very easy for the outer end of the bellows to deform downward, and when the bellows is in a compressed state, the gap between adjacent bellows teeth on the lower side of the bellows is significantly smaller than the gap between adjacent bellows teeth on the upper side of the bellows, resulting in uneven stress on the upper and lower sides of the bellows. This technical problem needs to be solved urgently. Summary of the invention

[0004] The purpose of the utility model is to solve the deficiencies of the above-mentioned technology and to provide a non-return limit structure for a bellows pump and a bellows pump, by adding a non-return limit structure so that the bellows in the liquid chamber of the damping part is subjected to uniform force, thereby reducing excessive compression deformation of the bellows and the difference in deformation between the upper and lower sides of the bellows during compression, thereby achieving continuous and stable liquid discharge from the bellows and reducing noise generation.

[0005] To this end, the utility model provides a non-return limit structure for a bellows pump, which includes a non-return valve body, the non-return valve body includes a first non-return valve and a second non-return valve, and the first non-return valve is connected to the second non-return valve;

[0006] The first check valve includes a first valve body, a first valve core, and a first return spring. The first valve body is a cup-shaped structure. An inwardly tightened edge is provided at the opening of the first valve body. A first through hole is opened at the bottom of the first valve body. A first mounting post is further provided at the bottom of the inner cavity of the first valve body. The first valve core is arranged inside the first valve body. The first valve core is provided with a first stop body and a first pipe body connected to each other. The first pipe body is sleeved on the first mounting post and is slidably connected to the first mounting post. The first return spring is sleeved on the first pipe body and the first mounting post. One end of the first return spring abuts against the bottom of the first valve body, and the other end of the first return spring abuts against the first stop body. The periphery of the first stop body presses against the inner side of the edge.

[0007] The second check valve includes a connecting ring, a second valve body, a second valve core, and a second return spring. The second valve body is a cup-shaped structure. The opening of the second valve body is communicated with one end of the connecting ring. A second through hole is opened at the bottom of the second valve body. A second mounting post is further provided at the bottom of the inner cavity of the second valve body. The second valve core is arranged inside the second valve body. The second valve core is provided with a second stop body and a second pipe body connected to each other. The second pipe body is sleeved on the second mounting post and is slidably connected to the second mounting post. The second return spring is sleeved on the second pipe body and the second mounting post. One end of the second return spring abuts against the bottom of the second valve body, and the other end of the second return spring abuts against the second stop body. The periphery of the second stop body presses against one end of the connecting ring, and the other end of the connecting ring is communicated with the bottom of the first valve body through the first through hole.

[0008] Preferably, the inner wall of the connecting ring is provided with a first stepped hole and a second stepped hole communicated with each other. The aperture of the first stepped hole is larger than that of the second stepped hole. The first stepped hole is close to the first check valve, and the second stepped hole is close to the second check valve.

[0009] Preferably, the pore wall of the first stepped hole is a slope surface, and the slope surface is an annular conical surface. The included angle α between the slope surface and the axis of the first stepped hole is 30 to 60°, and it faces the first through hole.

[0010] Preferably, a third through hole is opened on the side wall of the second valve body of the second check valve.

[0011] Preferably, the surface of the first stop body facing away from the first pipe body is set as an umbrella-shaped first diversion inclined surface. The periphery of the first diversion inclined surface abuts against the inner side of the edge. The surface of the second stop body facing away from the second pipe body is set as an umbrella-shaped second diversion inclined surface. The periphery of the second diversion inclined surface abuts against one end of the connecting ring.

[0012] A bellows pump includes a damping part. The bellows pump includes the check valve and limit structure for bellows pump described in any one of the above. This check valve and limit structure is installed inside the first bellows of the damping part and is communicated with the liquid inlet of the valve core. The first check valve faces the liquid inlet, and the second check valve is partially or completely exposed from the valve core.

[0013] Preferably, the first check valve is arranged inside the liquid inlet of the valve core, and the second check valve is arranged outside the valve core.

[0014] Preferably, the bellows pump includes a driving part, and the driving part includes a pump shaft. The pump shaft passes through the bottom wall of the first pump housing, and the pump shaft is in sealed sliding connection with the bottom wall of the first pump housing through a first sealing assembly. The first sealing assembly includes a first annular seal and a second annular seal, and the first annular seal and the second annular seal are adjacent to each other.

[0015] Preferably, the first annular seal includes a first seal ring body. A first annular groove is formed on the outer circumferential surface of the outer wall of the first seal ring body, and a first compression seal ring is installed in the first annular groove; the second annular seal includes a second seal ring body. A second annular groove is formed on the outer circumferential surface of the outer wall of the second seal ring body, and a second compression seal ring is installed in the second annular groove; third annular grooves are formed on the circumferential surfaces of the left and right side walls of the second seal ring body, and a third compression seal ring is installed in the third annular groove. The opening of one of the third annular grooves faces the first annular seal.

[0016] Preferably, the bellows pump includes a driving part, and the driving part includes a piston and a cylinder block. The piston is arranged inside the cylinder block, the cylinder block is in sealed connection with the bottom wall of the first pump housing, and the piston is in sealed sliding connection with the bottom wall of the first pump housing through a second sealing assembly. The second sealing assembly includes a third annular seal and a fourth annular seal, and the third annular seal and the fourth annular seal are adjacent to each other.

[0017] Preferably, the third annular seal includes a third seal ring body. A fourth annular groove is formed on the outer circumferential surface of the outer wall of the third seal ring body, and a fourth compression seal ring is installed in the fourth annular groove; the fourth annular seal includes a fourth seal ring body. A fifth annular groove is formed on the outer circumferential surface of the outer wall of the fourth seal ring body, and a fifth compression seal ring is installed in the fifth annular groove; a sixth annular groove is formed on the circumferential surface of one of the side walls of the second seal ring body, and a sixth compression seal ring is installed in the sixth annular groove. The opening of the sixth annular groove faces the third annular seal.

[0018] Preferably, the third seal ring body of the third annular seal is made of a hard self-lubricating material, and the fourth seal ring body of the fourth annular seal is made of a soft self-lubricating material.

[0019] Preferably, a gas supply damping device is installed in the third air chamber of the damping part, and the gas supply damping device is connected to the bottom wall of the second pump housing; the gas supply damping device includes a valve housing, a gas supply valve device and an exhaust valve device. The gas supply valve device and the exhaust valve device are arranged inside the valve housing, and the gas supply damping device is arranged at a spaced interval opposite to the first bellows cover.

[0020] Preferably, the air supply damping device is further provided with a support positioning plate, which is installed on the left side of the valve housing, and the support positioning plate is arranged parallel to and spaced from the outer surface of the first bellows cover.

[0021] Preferably, the air supply valve device includes an air supply valve mounting member, a first spring, an air supply valve core head, and an air supply valve push rod. The air supply valve mounting member is a cup-shaped structure with an air supply port opened at its bottom. A first mounting hole is opened on the right side of the valve housing, and the air supply valve mounting member is connected and arranged in the first mounting hole. The air supply valve mounting member and the first mounting hole enclose an air supply valve chamber, and the air supply valve chamber is communicated with the air supply port. The first spring and the air supply valve core head are arranged in the air supply valve chamber. The right end of the first spring abuts and connects to the bottom of the air supply valve mounting member, and the left end of the first spring abuts and connects to the back of the air supply valve core head. The right end of the air supply valve push rod is connected to the head of the air supply valve core head, and the left end of the air supply valve push rod passes through the valve housing and extends out. The valve housing is provided with a first air outlet hole and a second air outlet hole. The right end of the air supply valve push rod is arranged in the first air outlet hole, and a gap is formed between them. The second air outlet hole is communicated with the third air chamber of the damping part. The aperture of the first air outlet hole is smaller than that of the air supply valve chamber. The head of the air supply valve core head seals the gap through a first sealing member under the action of the elastic force of the first spring. When the air supply valve push rod pushes the air supply valve core head to the right to open the gap, the air supply valve chamber is communicated with the second air outlet hole through the gap.

[0022] The exhaust valve device includes an exhaust valve mounting member, a second spring, a third spring, an exhaust valve core head, a pushing member, and an exhaust valve rod. The exhaust valve mounting member is a cup-shaped structure with an exhaust port opened at its bottom. A second mounting hole is opened on the right side of the valve housing, and the exhaust valve mounting member is connected and arranged in the second mounting hole. The exhaust valve mounting member and the second mounting hole enclose an exhaust valve chamber, and the exhaust valve chamber is communicated with the exhaust port. The valve housing is provided with an exhaust hole, and the exhaust valve chamber is communicated with the third air chamber of the damping part through the exhaust hole. The second spring and the exhaust valve core head are arranged in the exhaust valve chamber. The right end of the second spring abuts and connects to the back of the exhaust valve core head, and the left end of the second spring abuts and connects to a spring mounting seat. A third mounting hole is opened on the left side of the valve housing, and the third spring and the spring mounting seat are arranged in the third mounting hole. The right end of the pushing member is arranged in the third mounting hole, and the left end of the pushing member extends out of the third mounting hole. The right end of the third spring abuts and connects to the spring mounting seat, and the left end of the third spring abuts and connects to the pushing member. The spring mounting seat is connected to the valve housing. The right end of the exhaust valve rod is connected to the back of the exhaust valve core head, and the left end of the exhaust valve rod passes through the second spring, the spring mounting seat, and the third spring in sequence and is fixed to the pushing member through a nut. The elastic force of the second spring is smaller than that of the third spring. Under the combined action of the elastic forces of the second spring and the third spring, the exhaust valve rod moves to the left to drive the exhaust valve core head to open the exhaust port. When the exhaust valve rod pushes the exhaust valve core head to the right to close the exhaust port, the head of the exhaust valve core head seals the exhaust port through a second sealing member.

[0023] The air supply valve push rod is arranged parallel to the exhaust valve stem and is spaced apart from each other, and both are arranged opposite to the first bellows cover plate, and the length of the left end of the air supply valve push rod extending out of the valve housing is shorter than the length of the left end of the exhaust valve stem extending out of the valve housing; when the exhaust valve stem pushes the exhaust valve core head to the right to close the exhaust port, the air supply valve push rod pushes the air supply valve core head to the right to open a gap.

[0024] The bottom wall of the second pump housing is respectively connected with a gas intake passage and a gas exhaust passage. The gas intake passage is connected with the gas supply port, and the gas exhaust passage is connected with the exhaust port.

[0025] The beneficial effects of the utility model are as follows: the utility model provides a non-return limit structure for a bellows pump and a bellows pump, so that the first bellows of the damping part is evenly stressed, and excessive compression deformation of the first bellows and deformation difference between the upper and lower sides of the first bellows during compression are reduced, thereby achieving continuous and stable liquid discharge from the first bellows; at the same time, the generation of noise is reduced, so that the noise problem of the bellows pump is greatly improved.

[0026] (1) By forming a liquid buffer space between the first check valve and the second check valve, the two check valves play a role in mutual pressure regulation, effectively reducing the impact sound between the valve core and the valve body, greatly improving the noise problem of the bellows pump, and at the same time promoting uniform force on the wall of the first bellows, ensuring stable liquid discharge from the first bellows.

[0027] (2) The non-return limit structure of the utility model is installed in the first bellows of the damping part, and the valve core of the second non-return valve is fully or partially exposed. When the first bellows of the damping part is stretched horizontally, the first bellows cover plate fixedly connected to the first bellows is separated from the bottom of the second non-return valve; when the first bellows of the damping part is contracted horizontally to the shortest, the first bellows cover plate contacts the bottom of the second non-return valve. On the one hand, the non-return limit structure of the utility model plays a limiting role on the lateral contraction of the first bellows, ensuring that the compression amount of the first bellows is appropriate, and there will be no problem of contact between adjacent corrugated teeth of the first bellows, so that the first bellows is evenly stressed. On the other hand, the non-return limit structure of the utility model plays a supporting and positioning role on the first bellows cover plate, thereby ensuring that the outer end of the first bellows will not deform downward, and the size of the gap between adjacent corrugated teeth on the lower side of the first bellows is close to or consistent with the size of the gap between adjacent corrugated teeth on the upper side of the first bellows, so that the upper and lower sides of the first bellows are evenly stressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required for use in the embodiments or the description of the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0029] Figure 1 Structural schematic diagram of the check and limit structure of the present utility model;

[0030] Figure 2 For Figure 1 Structural schematic diagram of the A-A cross-sectional view of the view shown;

[0031] Figure 3 For Figure 1 Structural schematic diagram of the perspective view of the view shown;

[0032] Figure 4 Structural schematic diagram of the corrugated pipe pump of the present utility model;

[0033] Figure 5 For Figure 4 Structural schematic diagram of the B-B cross-sectional view of the view shown;

[0034] Figure 6 For Figure 5 Structural schematic diagram of the enlarged view of part A of the view shown;

[0035] Figure 7 For Figure 5 Structural schematic diagram of the enlarged view of part B of the view shown;

[0036] Figure 8 For Figure 5 Structural schematic diagram of the enlarged view of part C of the view shown;

[0037] Figure 9 For Figure 4 Structural schematic diagram of the C-C cross-sectional view of the view shown;

[0038] Figure 10 For Figure 9 Structural schematic diagram of the enlarged view of part D of the view described;

[0039] Figure 11 For Figure 9 In the view shown, when the exhaust valve stem and the air supply valve push rod are both pushed into the valve housing by the first corrugated pipe cover plate; Structural schematic diagram;

[0040] Figure 12 Structural schematic diagram of the perspective view of the air supply damping device of the present utility model;

[0041] Figure 13 For Figure 9Schematic diagram of the enlarged view of part E of the said view.

[0042] Markings in the figure: 1. First check valve, 2. Second check valve, 3. Damping part, 4. Valve core, 5. Driving part, 6. First annular seal, 7. Second annular seal, 8. Third annular seal, 9. Fourth annular seal, 10. First bellows, 11. First valve body, 12. First valve core, 13. First return spring, 14. Bottom wall of the first pump housing, 15. Air supply damping device, 16. Second bellows, 17. Liquid suction port, 18. Liquid discharge port, 19. First bellows cover plate, 20. Third check valve, 21. Second valve body, 22. Second valve core, 23. Second return spring, 24. Connecting ring, 25. Second bellows cover plate, 26. First air chamber, 27. Second air chamber, 28. Third air chamber, 29. Second bottom wall of the pump housing, 30. Valve body, 31. Air supply valve mounting part, 32. First spring, 33. Air supply valve core head, 34. Air supply valve push rod, 35. Air supply port, 36. Air supply valve chamber, 37. Second air outlet hole, 38. Gap, 39. First seal, 40. Exhaust valve mounting part, 41. Liquid flow inlet, 42. Second spring, 43. Third spring, 44. Exhaust valve core head, 45. Pushing part, 46. Exhaust valve rod, 47. Exhaust port, 48. Exhaust valve chamber, 49. Exhaust hole, 50. Spring mounting seat, 51. Pump shaft, 52. Piston, 53. Cylinder block, 54. Third mounting hole, 55. Nut, 56. Second seal, 57. First shell cylinder, 58, Second shell cylinder, 59. First proximity sensor, 60. Second proximity sensor, 61. First sealing ring body, 62. First annular groove, 63. First compression sealing ring, 64. Sensor induction part, 71. Second sealing ring body, 72. Second annular groove 73. Second compression sealing ring, 74. Third annular groove 75. Third compression sealing ring, 81. Third sealing ring body, 82. Fourth annular groove 83. Fourth compression sealing ring, 91. Fourth sealing ring body, 92. Fifth annular groove, 93. Fifth compression sealing ring, 94. Sixth annular groove 95. Sixth compression sealing ring, 111. Edge, 112. First through hole, 113. First mounting post, 121. First stop body, 122. First pipe body, 151. Valve housing, 152. Support and positioning plate, 211. Second through hole, 212. Second mounting post, 213. Third through hole, 221. Second stop body, 222. Second pipe body, 241. First stepped hole, 242. Second stepped hole, 291. Gas inlet passage, 292. Gas exhaust passage, 1211. First guide slope, 2211. Second guide slope, α. Angle between the hole wall of the first stepped hole 241 and the axis of the first stepped hole. Detailed implementation

[0043] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. The methods used in the present utility model are all conventional methods unless otherwise specified; the raw materials and devices used are all conventional commercially available products unless otherwise specified.

[0044] Embodiment 1

[0045] As Figures 1 - 3 shown, the present utility model provides a check and limit structure for a bellows pump, which includes a check valve body. The check valve body includes a first check valve 1 and a second check valve 2, and the first check valve 1 and the second check valve 2 are communicated with each other;

[0046] The first check valve 1 includes a first valve body 11, a first valve core 12, and a first return spring 13. The first valve body 11 is a cup-shaped structure. An inwardly tightened edge 111 is provided at the opening of the first valve body 11. A first through hole 112 is opened at the bottom of the first valve body 11. A first mounting post 113 is further provided at the bottom of the inner cavity of the first valve body 11; the first valve core 12 is arranged in the first valve body 11. The first valve core 12 is provided with a first stop body 121 and a first pipe body 122 that are connected to each other. The first pipe body 122 is sleeved on the first mounting post 113, and the first pipe body 122 is slidably connected to the first mounting post 113; the first return spring 13 is sleeved on the first pipe body 122 and the first mounting post 113, and one end of the first return spring 13 abuts against the bottom of the first valve body 11, and the other end of the first return spring 13 abuts against the first stop body 121; the periphery of the first stop body 121 presses against the inner side of the edge 111. When the rightward thrust of the external liquid is greater than the elastic force of the first return spring 13, the first stop body 121 is opened, that is, the first stop body 121 is separated from the edge 111, and a liquid flow channel is formed between the two; when the rightward push of the external liquid is less than the elastic force of the first return spring 13, the first stop body 121 is closed, that is, the first stop body 121 abuts against the edge 111, and the liquid flow channel between the two is closed.

[0047] The second check valve 2 includes a connecting ring 24, a second valve body 21, a second valve core 22, and a second return spring 23. The second valve body 21 is in a cup shape. The opening of the second valve body 21 is communicated with one side of the connecting ring 24. A second through hole 211 is formed at the bottom of the second valve body 21, and a second mounting post 212 is further provided at the bottom of the inner cavity of the second valve body 21. The second valve core 22 is arranged in the second valve body 21. The second valve core 22 is provided with a second stop body 221 and a second tube body 222 which are connected to each other. The second tube body 222 is sleeved on the second mounting post 212, and the second tube body 222 is slidably connected to the second mounting post 212. The second return spring 23 is sleeved on the second tube body 222 and the second mounting post 212. One end of the second return spring 23 abuts against the bottom of the second valve body 21, and the other end of the second return spring 23 abuts against the second stop body 221. The periphery of the second stop body 221 presses against one side of the connecting ring 24, and the other side of the connecting ring 24 is communicated with the bottom of the first valve body 11 through a first through hole 112. When the rightward thrust of the liquid from the first check valve 1 is greater than the elastic force of the second return spring 23, the second stop body 221 is opened, that is, the second stop body 221 is separated from the connecting ring 24, and a liquid flow channel is formed between the two. When the rightward thrust of the liquid from the first check valve 1 is less than the elastic force of the second return spring 23, that is, the second stop body 221 is closed, the second stop body 221 abuts against the connecting ring 24, and the liquid flow channel between the two is closed.

[0048] During use, as shown in Figure 2 and Figure 5 , the check valve limiting structure of the present utility model is installed in the first bellows 10 of the damping part 3 of the bellows pump, and the check valve limiting structure is communicated with the liquid inlet 41 of the valve core 4. The first check valve 1 faces the liquid inlet 41, and the second check valve 2 is wholly or partly exposed from the valve core 4.

[0049] When the second bellows 16 of the driving part 5 contracts laterally and the first bellows 10 of the damping part 3 stretches laterally, the liquid flows from the inner cavity of the second bellows 16 of the driving part 5 through the liquid inlet 41 and the check limit structure of the present invention into the inner cavity of the first bellows 10 of the damping part 3. The specific process is as follows: The liquid in the inner cavity of the second bellows 16 of the driving part 5 enters the first check valve 1 and flows out from the first through hole 112, then enters the second check valve 2 through the connecting ring 24 and flows out from the second through hole 211, and finally enters the inner cavity of the first bellows 10. During this process, the second bellows 16 contracts laterally, causing the liquid inside it to push the first stop body 121 open. The liquid enters the first check valve 1 and flows out from the first through hole 112, and then pushes the second stop body 221 open; when the liquid pushes the second stop body 221 open and enters the second check valve 2, the liquid will be subject to the liquid resistance from the inner cavity of the first bellows 10 of the damping part 3, making the opening state of the second stop body 221 change from fast to slow, reducing the impact force at the maximum state when the liquid pushes the check limit structure of the present invention open, thereby reducing noise. As the first bellows 10 of the damping part 3 stretches laterally, the liquid enters the inner cavity of the first bellows 10 from the second through hole 211 of the second check valve 2. The inner cavity of the first bellows 10 expands as it is filled with liquid, reaching the maximum lateral stretching distance, and completing the transfer of the liquid from the inner cavity of the second bellows 16 of the driving part 5 to the inner cavity of the first bellows 10 of the damping part 3.

[0050] Then, the first bellows 10 of the damping part 3 contracts laterally, and the liquid in the inner cavity of the first bellows 10 of the damping part 3 enters the check and limit structure of the present invention. This check and limit structure plays an insulating role to prevent the liquid in the inner cavity of the first bellows 10 of the damping part 3 from flowing back into the inner cavity of the second bellows 16. At the same time, the liquid in the inner cavity of the first bellows 10 of the damping part 3 overflows from the liquid discharge port 18. The specific process is as follows: The liquid in the inner cavity of the first bellows 10 of the damping part 3 flows into the second check valve 2 from the second through hole 211. The back surface of the second stop body 221 is first subjected to the pressure of the liquid from the inner cavity of the first bellows 10 of the damping part 3, causing the second stop body 221 to have a tendency to close. Then, the liquid between the second stop body 221 and the first stop body 121 transmits the force to the back surface of the first stop body 121, causing the first stop body 121 to close as the second stop body 221 closes. During this closing process, since the force on the liquid between the second stop body 221 and the first stop body 121 is two-way, the second stop body 221 receives a reaction force when closing, that is, when the second stop body 221 closes, its front surface receives a rightward thrust from the liquid between the second stop body 221 and the first stop body 121, slowing down the closing speed of the second stop body 221, thereby reducing the collision noise. When the first stop body 121 closes, it receives a reaction force from the liquid in the inner cavity of the second bellows 16 of the driving part 5, that is, when the first stop body 121 closes, its front surface receives a rightward thrust from the liquid in the inner cavity of the second bellows 16 of the driving part 5, slowing down the closing speed of the first stop body 121, thereby reducing the collision noise and reducing the generation of noise. By forming a liquid buffer space between the first check valve 1 and the second check valve 2, the noise problem of the bellows pump is greatly improved. At the same time, it also makes the force on the wall of the first bellows 10 uniform, ensuring stable liquid discharge from the first bellows 10.

[0051] The check and limit structure of the present utility model is installed inside the first bellows 10 of the damping part 3, and the second check valve 2 is wholly or partly exposed from the valve core 4. When the first bellows 10 of the damping part 3 is stretched horizontally, the first bellows cover plate 19 fixedly connected to the first bellows 10 moves rightward and disengages from the bottom of the second check valve 2; when the first bellows 10 of the damping part 3 is horizontally contracted to the shortest, the first bellows cover plate 19 contacts the bottom of the second check valve 2. On the one hand, the check and limit structure of the present utility model plays a role in limiting the horizontal contraction of the first bellows 10, ensuring that the compression amount of the first bellows 10 is appropriate. For example, according to actual conditions, the distance between adjacent corrugated tooth walls can be set to 0.5 mm or more than 0.7 mm to ensure that there is no possibility of contact between adjacent corrugated teeth, and the problem of contact between adjacent corrugated teeth of the first bellows 10 will not occur, making the force on each part of the first bellows 10 uniform; on the other hand, the check and limit structure of the present utility model plays a role in supporting and positioning the first bellows cover plate 19, thereby ensuring that the outer end of the first bellows 10 will not deform downward, and the size of the gap between adjacent corrugated teeth on the lower side of the first bellows 10 is close to or the same as the size of the gap between adjacent corrugated teeth on the upper side of the first bellows 10, making the force on the upper and lower sides of the first bellows 10 uniform.

[0052] In addition, as a spring structure, the first return spring 13 is arranged inside the first check valve 1, and the second return spring 23 is arranged inside the second check valve 2, so that the reaction force after the impact when the first check valve 1 and the second check valve 2 are closed can be partly offset by the spring structure inside them, reducing the vibration frequency of the check valve. At the same time, due to the reaction force of the spring structure in the check valve where it is located, the check valve decelerates before reaching the maximum open position, so that when the check valve reaches the maximum open position, the impact force is reduced, also reducing the vibration frequency of the check valve, thus reducing the generation of noise.

[0053] It can be seen that the present utility model provides a check and limit structure for a bellows pump, making the force on the first bellows 10 of the damping part 3 uniform, reducing the excessive compression deformation of the first bellows 10 and the deformation difference between the upper and lower sides of the first bellows 10 during compression, and realizing the continuous and stable liquid discharge of the first bellows 10; at the same time, reducing the generation of noise and greatly improving the noise problem of the bellows pump.

[0054] In some embodiments, by Figure 2As shown, the inner wall of the connecting ring 24 is preferably provided with a first stepped hole 241 and a second stepped hole 242 that communicate with each other. The aperture of the first stepped hole 241 is larger than that of the second stepped hole 242. The first stepped hole 241 is close to the first check valve 1, and the second stepped hole 242 is close to the second check valve 2, further promoting the stable liquid discharge of the first bellows 10. The pore wall of the first stepped hole 241 is a slope surface, and the slope surface is an annular conical surface. The included angle α between it and the axis of the first stepped hole 241 is preferably 30 to 60°, and it faces the first through hole 112. When the liquid from the first through hole 112 passes through the first stepped hole 241 and the second stepped hole 242, the internal flow resistance is smaller, making the mutual adjustment between the first check valve 1 and the second check valve 2 smoother, and the reaction adjustment speed of the two faster.

[0055] In some embodiments, Figure 2 As shown, a third through hole 213 is preferably formed in the side wall of the second valve body 21 of the second check valve 2, further promoting the stable liquid inlet of the first bellows 10, greatly reducing the fluid resistance when the liquid flows out of the check valve limiting structure of the present invention and enters the first bellows 10, and effectively improving the rate of liquid entering the damping portion 3.

[0056] In some embodiments, Figure 2 As shown, the surface of the first stopper 121 facing away from the first pipe body 122 is preferably provided with a first guiding inclined surface 1211 in the shape of an umbrella, and the periphery of the first guiding inclined surface 1211 abuts against the inner side of the edge 111; the surface of the second stopper 221 facing away from the second pipe body 222 is preferably provided with a second guiding inclined surface 2211 in the shape of an umbrella, and the periphery of the second guiding inclined surface 2211 abuts against one end of the connecting ring 24, promoting the stable liquid inlet of the first bellows 10.

[0057] Embodiment 2

[0058] As Figure 2 , Figure 5 shown, the present invention provides a bellows pump, which includes a damping portion 3. The bellows pump includes the check valve limiting structure for the bellows pump described in the above Embodiment 1. This check valve limiting structure is installed in the first bellows 10 of the damping portion 3, and the check valve limiting structure communicates with the liquid inlet 41 of the valve core 4. The first check valve 1 faces the liquid inlet 41, and the second check valve 2 is fully or partially exposed outside the valve core 4. The content of the check valve limiting structure of the present invention and its technical effects have been described in the above Embodiment 1, and will not be repeated here.

[0059] In some embodiments, the first check valve 1 is arranged in the liquid inlet 41 of the valve core 4, effectively saving non-active space and raw materials; the second check valve 2 is arranged outside the valve core 4 to limit the compression of the first bellows 10.

[0060] In some embodiments, the check and limit structure of the present utility model is preferably concentrically arranged with the first corrugated pipe 10 to ensure smooth contact between the end plane of the corrugated pipe and the limit structure, and also effectively prevent the phenomenon of the end of the corrugated pipe sinking. On the basis of meeting the liquid flow rate, the bottom diameter of the second valve body 21 of the second check valve 2 of the present utility model is preferably set to be more than 40 mm.

[0061] In some embodiments, the first check valve 1 of the present utility model and the liquid inlet 41 are preferably connected by threads, which is convenient for installation and disassembly.

[0062] Embodiment 3

[0063] This embodiment is a further limitation of the above Embodiment 2. As Figure 5 shown, the bellows pump further includes a driving part 5. The driving part 5 includes a pump shaft 51. The pump shaft 51 passes through the bottom wall 14 of the first pump housing, and the pump shaft 51 is hermetically and slidably connected to the bottom wall 14 of the first pump housing through a first sealing assembly. The first sealing assembly includes a first annular seal 6 and a second annular seal 7. The first annular seal 6 and the second annular seal 7 are closely adjacent to each other to improve the sealing effect.

[0064] In some embodiments, as Figure 5 、 Figure 6 shown, the first annular seal 6 includes a first seal ring body 61. A first annular groove 62 is formed on the outer circumferential surface of the outer wall of the first seal ring body 61, and a first compression seal ring 63 is installed in the first annular groove 62; the second annular seal 7 includes a second seal ring body 71. A second annular groove 72 is formed on the outer circumferential surface of the outer wall of the second seal ring body 71, and a second compression seal ring 73 is installed in the second annular groove 72; third annular grooves 74 are formed on the circumferential surfaces of the left and right side walls of the second seal ring body 71, and third compression seal rings 75 are installed in the third annular grooves 74. The opening of one of the third annular grooves 74 faces the first annular seal 6 to further improve the sealing effect.

[0065] Embodiment 4

[0066] This embodiment is a further limitation of the above Embodiment 2 or 3. As Figure 5 shown, the bellows pump includes a driving part 5. The driving part 5 includes a piston 52 and a cylinder block 53. The piston 52 is arranged in the cylinder block 53. The cylinder block 53 is hermetically connected to the bottom wall 14 of the first pump housing. The piston 52 and the bottom wall 14 of the first pump housing are hermetically and slidably connected through a second sealing assembly. The second sealing assembly includes a third annular seal 8 and a fourth annular seal 9. The third annular seal 8 and the fourth annular seal 9 are closely adjacent to each other to improve the sealing effect.

[0067] In some embodiments, as Figure 5 、 Figure 7As shown, the third annular seal 8 may include a third seal ring body 81. A fourth annular groove 82 is formed on the outer circumferential surface of the third seal ring body 81, and a fourth compression seal ring 83 is installed in the fourth annular groove 82; the fourth annular seal 9 includes a fourth seal ring body 91. A fifth annular groove 92 is formed on the outer circumferential surface of the fourth seal ring body 91, and a fifth compression seal ring 93 is installed in the fifth annular groove 92; a sixth annular groove 94 is formed on the circumferential surface of one side wall of the second seal ring body 71, and a sixth compression seal ring 95 is installed in the sixth annular groove 94, and the opening of the sixth annular groove 94 faces the third annular seal 8, further improving the sealing effect.

[0068] In some embodiments, the third seal ring body 81 of the third annular seal 8 is preferably made of a hard self-lubricating material, such as a hard self-lubricating material like PTFE (polytetrafluoroethylene), etc., as the stress support for the reciprocating movement of the piston 52 to ensure the stability of the movement of the piston 52; the fourth seal ring body 91 of the fourth annular seal 9 is preferably made of a soft self-lubricating material, such as RULON (modified polytetrafluoroethylene material), etc., to maximize the sealing effect of the reciprocating movement of the piston 52.

[0069] Embodiment 5

[0070] This embodiment is a further limitation of any one of the above Embodiments 2 to 4. The present invention provides a bellows pump, which consists of Figure 5 、 Figure 9 As shown, a gas supply damping device 15 is installed in the third air chamber 28 of the damping part 3, and the gas supply damping device 15 is connected to the bottom wall 29 of the second pump housing; the gas supply damping device 15 includes a valve housing 151, a gas supply valve device, and an exhaust valve device. The gas supply valve device and the exhaust valve device are arranged in the valve housing 151, and the gas supply damping device 15 is arranged opposite to and spaced apart from the first bellows cover plate 19.

[0071] When the first bellows 10 of the damping part 3 is stretched laterally, by opening the gas supply valve device and closing the exhaust valve device, the external compressed gas is transmitted to the third air chamber 28 through the gas supply valve device, applying a reverse thrust to the first bellows cover plate 19, so that the first bellows cover plate 19 decelerates and moves in the reverse direction, and the liquid in the inner cavity of the first bellows 10 contracts and moves with the reverse force of the first bellows 10, reducing the liquid pulsation, and realizing the liquid overflowing from the liquid discharge port 18; when the first bellows 10 of the damping part 3 contracts laterally, by closing the gas supply valve device and opening the exhaust valve device, the compressed gas in the third air chamber 28 is discharged to the outside through the exhaust valve device for pressure relief; reducing the liquid discharge pressure of the first bellows 10, playing a role in stabilizing the pressure of the liquid output by the bellows pump. Thus, the gas supply damping device 15 realizes the continuity of the liquid discharge by the action of the first bellows 10 by supplementing and releasing the compressed gas pressure.

[0072] In some embodiments, as shown by Figure 9 , Figure 12 , the gas supply damping device 15 of the present utility model further includes a support positioning plate 152. The support positioning plate 152 is installed on the left side of the valve housing 151, and the support positioning plate 152 is disposed opposite and parallel to the outer surface of the first bellows cover 19 at an interval. When the first bellows 10 of the damping portion 3 is stretched horizontally, the first bellows cover 19 fixedly connected to the first bellows 10 moves to the right and disengages from the bottom of the second check valve 2. When the first bellows 10 of the damping portion 3 is stretched horizontally to the longest, the first bellows cover 19 contacts the support positioning plate 152. On the one hand, the support positioning plate 152 of the present utility model plays a limiting role in the horizontal stretching of the first bellows 10, ensuring that the extension amount of the first bellows 10 is appropriate, and preventing the problem that the adjacent corrugated teeth of the first bellows 10 are overstressed and cracked during stretching, so that the first bellows 10 is uniformly stressed everywhere. On the other hand, the support positioning plate 152 of the present utility model plays a role in supporting and positioning the first bellows cover 19, thereby ensuring that when the first bellows 10 is stretched to the longest, the outer end thereof does not deform downward, and the gap size between the adjacent corrugated teeth below the first bellows 10 is close to or the same as the gap size between the adjacent corrugated teeth above the first bellows 10, so that the upper and lower sides of the first bellows 10 are uniformly stressed.

[0073] The gas supply valve device and the exhaust valve device of the present utility model can be existing devices, or can be preferably devices with the following structures respectively:

[0074] In some embodiments, as shown by Figure 10As shown, the air supply valve device includes an air supply valve mount 31, a first spring 32, an air supply valve core head 33, and an air supply valve push rod 34. The air supply valve mount 31 is a cup-shaped structure with an air supply port 35 opened at its bottom. A first mounting hole is opened on the right side of the valve housing 151. The air supply valve mount 31 is connected and arranged in the first mounting hole, and the air supply valve mount 31 and the first mounting hole enclose an air supply valve chamber 36. The air supply valve chamber 36 is communicated with the air supply port 35. The first spring 32 and the air supply valve core head 33 are arranged in the air supply valve chamber 36. The right end of the first spring 32 abuts and connects to the bottom of the air supply valve mount 31, and the left end of the first spring 32 abuts and connects to the back of the air supply valve core head 33. The right end of the air supply valve push rod 34 is connected to the head of the air supply valve core head 33, and the left end of the air supply valve push rod 34 passes through the valve housing 151 and extends out. The valve housing 151 is provided with a first air outlet hole and a second air outlet hole 37. The right end of the air supply valve push rod 34 is arranged in the first air outlet hole, and a gap 38 is formed therebetween. The second air outlet hole 37 is communicated with the third air chamber 28 of the damping part 3. The aperture of the first air outlet hole is smaller than that of the air supply valve chamber 36. The head of the air supply valve core head 33 seals the gap 38 through a first seal 39 under the action of the elastic force of the first spring 32. From Figure 11 As shown, when the air supply valve push rod 34 pushes the air supply valve core head 33 to the right to open the gap 38, the air supply valve chamber 36 is communicated with the second air outlet hole 37 through the gap 38.

[0075] In some embodiments, from Figure 8 、 Figure 10As shown, the exhaust valve device includes an exhaust valve mounting member 40, a second spring 42, a third spring 43, an exhaust valve core head 44, a push member 45, and an exhaust valve stem 46. The exhaust valve mounting member 40 has a cup-shaped structure, and an exhaust port 47 is provided at its bottom. A second mounting hole is provided on the right side of the valve housing 151. The exhaust valve mounting member 40 is connected and disposed in the second mounting hole, and the exhaust valve mounting member 40 and the second mounting hole enclose an exhaust valve chamber 48. The exhaust valve chamber 48 is communicated with the exhaust port 47. The valve housing 151 is provided with an exhaust hole 49, and the exhaust valve chamber 48 is communicated with the third air chamber 28 of the damping portion 3 through the exhaust hole 49. The second spring 42 and the exhaust valve core head 44 are disposed in the exhaust valve chamber 48, and the right end of the second spring 42 abuts and connects to the back of the exhaust valve core head 44, and the left end of the second spring 42 abuts and connects to the spring mounting seat 50. A third mounting hole 54 is provided on the left side of the valve housing 151. The third spring 43 and the spring mounting seat 50 are disposed in the third mounting hole 54. The right end of the push member 45 is disposed in the third mounting hole 54, and the left end of the push member 45 extends out of the third mounting hole 54. The right end of the third spring 43 abuts and connects to the spring mounting seat 50, the left end of the third spring 43 abuts and connects to the push member 45, and the spring mounting seat 50 is connected to the valve housing 151. The right end of the exhaust valve stem 46 is connected to the back of the exhaust valve core head 44, and the left end of the exhaust valve stem 46 passes through the second spring 42, the spring mounting seat 50, and the third spring 43 in sequence and is fixedly connected to the push member 45 through a nut 55. The elastic force of the second spring 42 is less than the elastic force of the third spring 43. Under the combined action of the elastic forces of the second spring 42 and the third spring 43, the exhaust valve stem 46 moves to the left to drive the exhaust valve core head 44 to open the exhaust port 47. From Figure 11 As shown, when the exhaust valve stem 46 pushes the exhaust valve core head 44 to the right to close the exhaust port 47, the head of the exhaust valve core head 44 seals the exhaust port 47 through the second seal 56.

[0076] In some embodiments, from Figure 10 As shown, the air supply valve push rod 34 and the exhaust valve stem 46 are arranged in parallel at an interval, both are arranged opposite and at an interval to the first bellows cover 19, and the length of the left end of the air supply valve push rod 34 extending out of the valve housing 151 is shorter than the length of the left end of the exhaust valve stem 46 extending out of the valve housing 151. From Figure 11 As shown, when the exhaust valve stem 46 pushes the exhaust valve core head 44 to the right to close the exhaust port 47, the air supply valve push rod 34 pushes the air supply valve core head 33 to the right to open the gap 38.

[0077] In some embodiments, from Figure 11As shown, the bottom wall 29 of the second pump housing is respectively and communicatively provided with a gas inlet passage 291 and a gas outlet passage 292. The gas inlet passage 291 is communicated with the gas supply port 35. When the gas supply valve device is in the open state, the external compressed gas enters the third gas chamber 28 through the gas inlet passage 291 and the gas supply port 35 of the gas supply valve device. Preferably, the external compressed gas enters the third gas chamber 28 through the gas inlet passage 291, the gas supply port 35, the gas supply valve chamber 36, the gap 38, and the second air outlet hole 37. As shown in the figure Figure 10 As shown, the gas outlet passage 292 is communicated with the exhaust port 47. When the exhaust valve device is in the open state, the compressed gas in the third gas chamber 28 is discharged to the outside through the exhaust port 47 of the exhaust valve device and the gas outlet passage 292. Preferably, the compressed gas in the third gas chamber 28 is discharged to the outside through the exhaust hole 49, the exhaust valve chamber 48, the exhaust port 47, and the gas outlet passage 292.

[0078] As Figure 10 , Figure 11 shown, when the first bellows 10 of the damping part 3 is stretched horizontally to the right, the first bellows cover plate 19 moves to the right. The first bellows cover plate 19 first touches the pushing member 45 fixedly connected to the exhaust valve rod 46. The first bellows cover plate 19 continues to move to the right, pushing the exhaust valve rod 46 together with the pushing member 45 to move to the right. Then, while the bellows cover plate 19 pushes the exhaust valve rod 46 to move to the right, it touches the gas supply valve push rod 34 and moves to the right, so as to open the gap 38 by the gas supply valve core head 33 and close the exhaust port 47 by the exhaust valve core head 44. As a result, the exhaust valve device changes from the open state to the closed state, and the gas supply valve device changes from the closed state to the open state. At this time, the external compressed gas is transmitted to the third gas chamber 28 through the gas supply valve device, applying a reverse thrust to the first bellows cover plate 19, so that the first bellows cover plate 19 decelerates and buffers to the right until it touches the support positioning plate 152.

[0079] Subsequently, under the continuous delivery of the externally compressed gas, the first bellows cover plate 19 is pushed to move leftward, causing the first bellows cover plate 19 to disengage from the support positioning plate 152; the liquid in the inner cavity of the first bellows 10 decreases the liquid pulsation as the first bellows 10 contracts horizontally leftward, and the liquid in the inner cavity of the first bellows 10 overflows from the liquid discharge port 18. Then, the first bellows cover plate 19 continues to move leftward and disengages from the air supply valve push rod 34, causing the air supply valve core head 33 to close the gap 38, so that the air supply valve device changes from the open state to the closed state; immediately afterwards, the compressed gas in the third air chamber 28 continues to push the first bellows cover plate 19 to move leftward and disengage from the exhaust valve rod 46. Since the elastic force of the second spring 42 is less than the elastic force of the third spring 43, the exhaust valve core head 44 opens the exhaust port 47, so that the exhaust valve device changes from the closed state to the open state; at this time, on the one hand, although the air supply valve device is in the closed state, the compressed gas in the third air chamber 28 continues to push the first bellows cover plate 19 to move leftward until it touches the bottom of the second check valve 2; on the other hand, the compressed gas in the third air chamber 28 is discharged to the outside through the exhaust valve device to relieve pressure, thereby reducing the liquid discharge pressure of the first bellows 10 and playing a role in stabilizing the pressure of the liquid output by the bellows pump.

[0080] Embodiment 6

[0081] This embodiment is a further limitation of the above Embodiments 2 to 6. As Figure 13 shown, the bellows pump further includes a sensor induction component 64, a first proximity sensor 59, and a second proximity sensor 60, all of which are arranged in the cavity surrounded by the bottom wall 14 of the first pump housing, the cylinder block 53, and the piston 52. The first proximity sensor 59 and the second proximity sensor 60 are arranged opposite to each other at intervals left and right. The sensor induction component 64 is arranged between the first proximity sensor 59 and the second proximity sensor 60, and the sensor induction component 64 is mounted on the piston 52. As the piston 52 reciprocates left and right, the sensor induction component 64 alternately approaches the first proximity sensor 59 and the second proximity sensor 60, so as to realize that the external pressurized air supply device alternately switches to supply compressed gas to the first air chamber 26 and the second air chamber 27 through the gas delivery pipeline.

[0082] The specific working principle is as follows: As Figure 9 、 Figure 13As shown, when the piston 52 moves to the left, the sensor sensing component 64 approaches the first proximity sensor 59 to the left. The first proximity sensor 59 transmits the sensing signal to the existing intelligent controller through the control line. After receiving the sensing signal, the intelligent controller sends an instruction to the solenoid valve installed on the gas pipeline of the pressurized air supply device through the control line. After receiving the instruction, the solenoid valve performs a pipeline switching action, switching from originally supplying compressed gas to the second air chamber 27 to supplying compressed gas to the first air chamber 26, realizing the rightward movement of the piston 52. The difference in the working principle between the second proximity sensor 60 and the first proximity sensor 59 is that after receiving the instruction, the solenoid valve performs a pipeline switching action, switching from originally supplying compressed gas to the first air chamber 26 to supplying compressed gas to the second air chamber 27, realizing the leftward movement of the piston 52. The other contents are the same and will not be repeated here. Thus, the left and right reciprocating movement of the piston 52 is realized.

[0083] It should be noted that:

[0084] From Figure 5 , Figure 9 As shown, the bellows pump of the present utility model mainly consists of a valve core 4, a driving part 5 and a damping part 3, and is applicable to bellows pumps such as low-pulsation bellows pumps. The function of the valve core 4 is to use the check valves and their combinations configured inside to perform switching inside the bellows pump to realize the liquid suction and discharge actions of the bellows pump. The main function of the driving part 5 is to use high-pressure gas to provide the power for liquid suction and discharge of the bellows pump. The main function of the damping part 3 is to use the air supply damping device 15 to perform damping control on the discharged liquid pressure when the damping part 3 of the bellows pump discharges liquid, so as to stabilize the discharge liquid pressure.

[0085] The valve core 4 mainly consists of a valve body 30, a third check valve 20 and the check valve limit structure of the present utility model. Inside the valve body 30, a liquid suction port 17, a liquid discharge port 18 and a liquid flow inlet 41 are communicated. Among them, a third check valve 20 is installed at the liquid suction port 17; the check valve limit structure of the present utility model is installed at the liquid flow inlet 41; a check valve can be optionally installed at the liquid discharge port 18, or it is preferably not installed, so that the liquid discharge port 18 is always kept unobstructed. The reason is that when the bellows pump works, the third check valve 20 and the check valve limit structure of the present utility model quickly alternate between the closed and open states, and the liquid discharge port 18 is always kept unobstructed, which is beneficial to the quick response of the liquid suction and discharge actions of the bellows pump with the intake and exhaust of compressed gas.

[0086] The driving part 5 includes a piston 52, a pump shaft 51, and a second bellows 16. When compressed gas enters the second air chamber 27 of the driving part 5 from an external pipeline and the compressed gas in the first air chamber 26 of the driving part 5 is discharged to the outside through a pipeline, the piston 52 moves leftward together with the pump shaft 51, and at the same time drives the second bellows 16 to be stretched horizontally to the left. The third check valve 20 opens, and the check limit structure of the present invention is in a closed state, so that external liquid enters the inner cavity of the second bellows 16 from the liquid suction port 17 through the third check valve 20, completing the liquid suction action of the driving part 5. When compressed gas enters the first air chamber 26 of the driving part 5 from another external pipeline and the compressed gas in the second air chamber 27 is discharged to the outside through a pipeline, the piston 52 moves rightward together with the pump shaft 51, and at the same time drives the second bellows 16 to contract horizontally to the right, closing the third check valve 20. The check limit structure of the present invention is in an open state, and the liquid in the inner cavity of the second bellows 16 enters the inner cavity of the first bellows 10 of the damping part 3 through the liquid flow inlet 41 and the check limit structure of the present invention, completing the liquid discharge action of the driving part 5.

[0087] The damping part 3 includes a gas supply damping device 15 and a first bellows 10. When the bellows pump performs the liquid discharge action of the driving part 5, that is, the liquid inlet action of the damping part 3, the liquid in the inner cavity of the second bellows 16 of the driving part 5 enters the inner cavity of the first bellows 10 of the damping part 3 through the liquid flow inlet 41 and the check limit structure of the present invention. The first bellows 10 is stretched horizontally to the right. When it stretches to a certain distance, the first bellows cover plate 19 touches the gas supply damping device 15, opening the gas supply valve device. External compressed gas enters the third air chamber 28 through the gas supply valve device, applying a reverse thrust to the first bellows cover plate 19, so that the first bellows cover plate 19 decelerates and buffers to the right until it stops. Then the first bellows cover plate 19 turns to move to the left, causing the first bellows 10 to contract horizontally to the left, and discharging the liquid in the first bellows 10 from the liquid discharge port 18.

[0088] During the process of the liquid being discharged from the inner cavity of the second bellows 16 of the driving part 5 into the inner cavity of the first bellows 10 of the damping part 3, the external compressed gas enters the third air chamber 28 through the air supply valve device, exerting a reverse force on the first bellows 10 to offset the pulsation of the liquid discharged from the second bellows 16. As the liquid continuously discharges from the second bellows 16 into the first bellows 10, then discharges from the first bellows 10 out of the bellows pump, and then the liquid enters the second bellows 16 from the outside, then discharges from the second bellows 16 into the first bellows 10, and then discharges from the first bellows 10 out of the bellows pump again... The whole process repeats. Through the alternating stretching or compressing actions of the second bellows 16 and the first bellows 10, the continuity of the actions of the second bellows 16 and the first bellows 10 is realized, and further the stable low-pulsation output of the liquid by the bellows pump is realized. Therefore, the present utility model provides a bellows pump, which is driven by gas and relies on alternately compressing or stretching the first bellows 10 and the second bellows 16. Through the cooperation of the compressing and stretching actions of the first bellows 10 and the second bellows 16, the purpose of reducing the pulsation of the liquid output by the conveying device is achieved.

[0089] Among them, the first air chamber 26 is mainly a cavity surrounded by the bottom wall 14 of the first pump housing, the second bellows 16, the second bellows cover plate 25, and the first cylinder 57, and the first air chamber 26 is communicated with an air inlet and outlet (not shown in the figure); the second air chamber 27 is mainly a cavity surrounded by the bottom wall 14 of the first pump housing and the piston 52, and the second air chamber 27 is communicated with an air inlet and outlet (not shown in the figure). The third air chamber 28 is mainly a cavity surrounded by the first bellows 10, the first bellows cover plate 19, the bottom wall 29 of the second pump housing, and the second cylinder 58.

[0090] The materials of the valve body 30, the first bellows 10, and the second bellows 16 are preferably polytetrafluoroethylene.

[0091] The bottom wall 14 of the first pump housing, the bottom wall 29 of the second pump housing, the first cylinder 57, and the second cylinder 58 are cast and processed from aluminum alloy materials.

[0092] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "left", "right", "up", "down", "top", "bottom", "front", "rear", "inner", "outer", "back", "middle", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. It should be noted that in the above embodiments, the "first", "second", and "third" do not represent an absolute distinction relationship in terms of structure and / or function, nor do they represent the execution order of sequence, but are only for the convenience of description.

[0093] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included within the protection scope of the present application.

Claims

1. A non-return limit structure for a bellows pump, comprising a non-return valve body, characterized in that: The check valve body comprises a first check valve (1) and a second check valve (2), and the first check valve (1) is connected to the second check valve (2); The first check valve (1) comprises a first valve body (11), a first valve core (12), and a first return spring (13); the first valve body (11) is a cup-shaped structure; an inwardly tightened edge (111) is provided at the opening of the first valve body (11); a first through hole (112) is provided at the bottom of the first valve body (11); and a first mounting column (113) is further provided at the bottom of the inner cavity of the first valve body (11); the first valve core (12) is arranged in the first valve body (11); the first valve core (12) is provided with a first stopper body (121) and a first tube body (13) which are connected to each other. (122), the first tube body (122) is sleeved on the first mounting column (113), and the first tube body (122) is slidably connected to the first mounting column (113); the first return spring (13) is sleeved on the first tube body (122) and the first mounting column (113), and one end of the first return spring (13) abuts against the bottom of the first valve body (11), and the other end of the first return spring (13) abuts against the first stopper (121); the periphery of the first stopper (121) abuts against the inner side of the edge (111); The second check valve (2) comprises a connecting ring (24), a second valve body (21), a second valve core (22), and a second return spring (23); the second valve body (21) is a cup-shaped structure; an opening of the second valve body (21) is connected to one end of the connecting ring (24); a second through hole (211) is provided at the bottom of the second valve body (21); a second mounting column (212) is also provided at the bottom of the inner cavity of the second valve body (21); the second valve core (22) is arranged in the second valve body (21); the second valve core (22) is provided with a second stopper (221) and a second tube (222) which are connected to each other; the second tube (222) The second valve body (21) is sleeved on the second mounting column (212), and the second tube body (222) is slidably connected to the second mounting column (212); the second return spring (23) is sleeved on the second tube body (222) and the second mounting column (212), and one end of the second return spring (23) abuts against the bottom of the second valve body (21), and the other end of the second return spring (23) abuts against the second stop body (221); the periphery of the second stop body (221) presses against one end of the connecting ring (24), and the other end of the connecting ring (24) is connected to the bottom of the first valve body (11) through the first through hole (112).

2. A non-return limit structure for a bellows pump according to claim 1, characterized in that: The inner wall of the connecting ring (24) is provided with a first step hole (241) and a second step hole (242) which are connected to each other; the diameter of the first step hole (241) is larger than the diameter of the second step hole (242); the first step hole (241) is close to the first check valve (1), and the second step hole (242) is close to the second check valve (2); The hole wall of the first step hole (241) is a slope surface, and the slope surface is an annular conical surface, the angle α between the slope surface and the axis of the first step hole (241) is 30-60 degrees, and the slope surface faces the first through hole (112).

3. A non-return limit structure for a bellows pump according to claim 1 or 2, characterized in that: A third through hole (213) is formed on the side wall of the second valve body (21).

4. A bellows pump, comprising a damping portion (3), characterized in that: The bellows (10) pump comprises a non-return limit structure for a bellows pump according to any one of claims 1 to 3, wherein the non-return limit structure is installed in the first bellows (10) of the damping part (3), and the non-return limit structure is connected to the liquid inlet (41) of the valve core (4), the first non-return valve (1) faces the liquid inlet (41), and the second non-return valve (2) is fully or partially exposed from the valve core (4).

5. A bellows pump according to claim 4, characterized in that: The first check valve (1) is arranged in a liquid inlet (41) of the valve core (4), and the second check valve (2) is arranged outside the valve core (4).

6. A bellows pump according to claim 4, characterized in that: The bellows pump comprises a driving part (5), the driving part (5) comprising a pump shaft (51), the pump shaft (51) passing through a first pump casing bottom wall (14), and the pump shaft (51) and the first pump casing bottom wall (14) are sealingly slidably connected via a first sealing assembly, the first sealing assembly comprising a first annular seal (6) and a second annular seal (7), the first annular seal (6) and the second annular seal (7) being adjacent to each other; The first annular seal (6) comprises a first sealing ring body (61), the outer wall circumferential surface of the first sealing ring body (61) is provided with a first annular groove (62), and a first compression sealing ring (63) is installed in the first annular groove (62); the second annular seal (7) comprises a second sealing ring body (71), the outer wall circumferential surface of the second sealing ring body (71) is provided with a second annular groove (72), and a second compression sealing ring (73) is installed in the second annular groove (72); the left and right side wall circumferential surfaces of the second sealing ring body (71) are provided with third annular grooves (74), and a third compression sealing ring (75) is installed in the third annular grooves (74), and one of the openings of the third annular grooves (74) faces the first annular seal (6).

7. A bellows pump according to claim 6, characterized in that: The bellows pump comprises a driving part (5), the driving part (5) comprising a piston (52) and a cylinder (53), the piston (52) being arranged in the cylinder (53), the cylinder (53) being sealingly connected to a first pump casing bottom wall (14), the piston (52) being sealingly slidably connected to the first pump casing bottom wall (14) via a second sealing assembly, the second sealing assembly comprising a third annular seal (8) and a fourth annular seal (9), the third annular seal (8) and the fourth annular seal (9) being adjacent to each other; The third annular seal (8) comprises a third sealing ring body (81), the outer wall circumferential surface of the third sealing ring body (81) is provided with a fourth annular groove (82), and a fourth compression sealing ring (83) is installed in the fourth annular groove (82); the fourth annular seal (9) comprises a fourth sealing ring body (91), the outer wall circumferential surface of the fourth sealing ring body (91) is provided with a fifth annular groove (92), and a fifth compression sealing ring (93) is installed in the fifth annular groove (92); a sixth annular groove (94) is provided on one of the side wall circumferential surfaces of the second sealing ring body (71), and a sixth compression sealing ring (95) is installed in the sixth annular groove (94), and the opening of the sixth annular groove (94) faces the third annular seal (8); The third sealing ring body (81) of the third annular sealing member (8) is made of a hard self-lubricating material, and the fourth sealing ring body (91) of the fourth annular sealing member (9) is made of a soft self-lubricating material.

8. A bellows pump according to claim 4, characterized in that: An air supply damping device (15) is installed in the third air chamber (28) of the damping portion (3), and the air supply damping device (15) is connected to the bottom wall (29) of the second pump casing; the air supply damping device (15) comprises a valve casing (151), an air supply valve device, and an exhaust valve device; the air supply valve device and the exhaust valve device are arranged in the valve casing (151), and the air supply damping device (15) and the first bellows cover plate (19) are arranged opposite to each other with a gap.

9. A bellows pump according to claim 8, characterized in that: The air supply damping device (15) is further provided with a support positioning plate (152), the support positioning plate (152) being installed on the left side of the valve housing (151), and the support positioning plate (152) and the outer surface of the first bellows cover plate (19) being arranged opposite each other in parallel and at intervals.

10. A bellows pump according to claim 8 or 9, characterized in that: The air supply valve device comprises an air supply valve mounting member (31), a first spring (32), an air supply valve core head (33), and an air supply valve push rod (34); the air supply valve mounting member (31) is a cup-shaped structure, and an air supply port (35) is provided at the bottom thereof; a first mounting hole is provided on the right side of the valve housing (151), the air supply valve mounting member (31) is connected and arranged in the first mounting hole, and the air supply valve mounting member (31) and the first mounting hole form an air supply valve chamber (36), and the air supply valve chamber (36) is communicated with the air supply port (35); the first spring (32) and the air supply valve core head (33) are arranged in the air supply valve chamber (36), and the right end of the first spring (32) is abutted and connected to the bottom of the air supply valve mounting member (31), and the left end of the first spring (32) is abutted and connected to the back of the air supply valve core head (33); the air supply valve push rod (34) is provided with a first mounting hole and a second mounting hole. The right end is connected to the head of the air supply valve core head (33), and the left end of the air supply valve push rod (34) passes through the valve housing (151) and extends out; the valve housing (151) is provided with a first air outlet and a second air outlet (37), the right end of the air supply valve push rod (34) is arranged in the first air outlet, and a gap (38) is formed between the two, and the second air outlet (37) is connected to the third air cavity (28) of the damping part (3); the aperture of the first air outlet is smaller than that of the air supply valve chamber (36), and the head of the air supply valve core head (33) seals the gap (38) through a first sealing member (39) under the action of the elastic force of the first spring (32); when the air supply valve push rod (34) pushes the air supply valve core head (33) to the right to open the gap (38), the air supply valve chamber (36) is connected to the second air outlet (37) through the gap (38); The exhaust valve device comprises an exhaust valve mounting member (40), a second spring (42), a third spring (43), an exhaust valve core head (44), a push member (45), and an exhaust valve stem (46); the exhaust valve mounting member (40) is a cup-shaped structure, and an exhaust port (47) is provided at the bottom thereof; a second mounting hole is provided on the right side of the valve housing (151); the exhaust valve mounting member (40) is connected and arranged in the second mounting hole, and the exhaust valve mounting member (40) and the second mounting hole form an exhaust valve chamber (48); the exhaust valve chamber (48) is connected to the exhaust port (47); the valve housing (151) is provided with a second mounting hole. The exhaust valve chamber (48) is connected to the third air cavity (28) of the damping portion (3) through the exhaust hole (49); the second spring (42) and the exhaust valve core head (44) are arranged in the exhaust valve chamber (48), and the right end of the second spring (42) is abutted against the back of the exhaust valve core head (44), and the left end of the second spring (42) is abutted against the spring mounting seat (50); a third mounting hole (54) is opened on the left side of the valve housing (151), and the third spring (43) and the spring mounting seat (50) are arranged in the third mounting hole (54). ), the right end of the ejector member (45) is arranged in the third mounting hole (54), and the left end of the ejector member (45) extends out of the third mounting hole (54); the right end of the third spring (43) is abutted against the spring mounting seat (50), the left end of the third spring (43) is abutted against the ejector member (45), and the spring mounting seat (50) is connected to the valve housing (151); the right end of the exhaust valve stem (46) is connected to the back of the exhaust valve core head (44), and the left end of the exhaust valve stem (46) passes through the second spring (42), the spring mounting seat (5 0), the third spring (43) is fixedly connected to the ejector member (45) via a nut (55); the elastic force of the second spring (42) is smaller than the elastic force of the third spring (43), and under the combined action of the elastic forces of the second spring (42) and the third spring (43), the exhaust valve stem (46) moves leftward to drive the exhaust valve core head (44) to open the exhaust port (47); when the exhaust valve stem (46) pushes the exhaust valve core head (44) rightward to close the exhaust port (47), the head of the exhaust valve core head (44) seals the exhaust port (47) via the second sealing member (56); The air supply valve push rod (34) and the exhaust valve stem (46) are arranged in parallel and spaced apart, and are both arranged opposite to the first bellows cover plate (19). The length of the left end of the air supply valve push rod (34) extending out of the valve housing (151) is shorter than the length of the left end of the exhaust valve stem (46) extending out of the valve housing (151). When the exhaust valve stem (46) pushes the exhaust valve core head (44) to the right to close the exhaust port (47), the air supply valve push rod (34) pushes the air supply valve core head (33) to the right to open the gap (38). The second pump housing bottom wall (29) is respectively connected with a gas intake channel (291) and a gas exhaust channel (292); the gas intake channel (291) is connected to the gas supply port (35), and the gas exhaust channel (292) is connected to the exhaust port (47).

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