Series diaphragm pump

Abstract

The present application relates to a series diaphragm pump, which includes a diaphragm assembly and a driving assembly. The diaphragm assembly includes a top seat, a valve seat and a diaphragm seat connected in sequence. The top seat is provided with an inlet and an outlet. The valve seat is provided with an inlet hole connected to the inlet and an outlet hole connected to the outlet. The diaphragm seat is provided with a diaphragm. The diaphragm includes a first movable bladder and a second movable bladder connected to each other. The first movable bladder is provided with a first bladder chamber connected to the inlet hole. The second movable bladder is provided with a second bladder chamber connected to the outlet hole. The diaphragm is provided with a check valve that allows fluid to flow only from the first bladder chamber to the second bladder chamber. The valve seat is provided with a first one-way valve that allows fluid to flow only from the inlet hole to the first bladder chamber in one direction and a second one-way valve that allows fluid to flow only from the second bladder chamber to the outlet in one direction. The driving assembly is connected to the diaphragm and can drive the first movable bladder and the second movable bladder to move up and down alternately. The diaphragm pump of the present application has a simple flow path when conveying fluid, a smaller pressure loss, and a greater pressure when conveying.

Description

Technical Field

[0001] The present application relates to the field of diaphragm pumps, and in particular to a series diaphragm pump. Background Art

[0002] The diaphragm pump is provided with circular motion by the motor, and the mechanical device makes the diaphragm in the pump do reciprocating motion, thereby compressing and stretching the air in the pump cavity. Under the action of the one-way valve, a pressure difference is generated between the water outlet or water inlet and the external atmospheric pressure. Under the action of the pressure difference, water is pressed into the water inlet and then discharged from the water outlet. With the development of industry, the size of the diaphragm pump can be as large as the transportation of industrial materials and the application of industrial equipment, or as small as the application of small household appliances and medical equipment, etc., according to the needs. It has strong applicability and wide application.

[0003] A series diaphragm pump is disclosed in the related art, which is mainly composed of a housing mechanism, a diaphragm mechanism and a driving mechanism. The housing mechanism includes a support assembly, a diaphragm seat, and an upper cover; a first cavity, a second cavity and a third cavity are sandwiched between the upper cover and the diaphragm seat; the diaphragm seat is provided with a first channel, a second channel and a third channel; the diaphragm mechanism includes a diaphragm, a first movable capsule and a second movable capsule connected in series; the diaphragm is provided with a first diaphragm and a second diaphragm, the first movable capsule is provided with a first capsule cavity, the second movable capsule is provided with a second capsule cavity, the first channel and the second channel are respectively connected to the first capsule cavity, and the third channel and the third cavity are respectively connected to the second capsule cavity; the driving mechanism is used to drive the first movable capsule and the second movable capsule to move up and down alternately. When the first movable capsule moves downward, the first capsule cavity can form a certain negative pressure, driving the external solution to flow into the first capsule cavity through the first cavity and the first channel; and the negative pressure in the first capsule cavity can also drive the second diaphragm to move downward and seal the second channel to prevent the solution in the second capsule cavity from flowing into the first capsule cavity. When the second movable capsule moves upward, the pressure in the second capsule cavity will increase, which can drive the solution in the second capsule cavity to flow out through the third cavity; and in this process, the pressure in the second capsule cavity will further allow the second diaphragm to seal the second channel. When the first movable capsule moves upward and the second movable capsule moves downward, the pressure in the first capsule cavity will increase, while the pressure in the second capsule cavity will decrease to form a negative pressure. Therefore, the first movable capsule will drive the first diaphragm to move upward and seal the liquid inlet, and at the same time push open the second diaphragm, allowing the solution in the first capsule cavity to flow into the second capsule cavity through the second channel, the second cavity and the third channel. During operation, the solution passes through the liquid inlet channel, the first cavity, the first channel, the first capsule cavity, the second channel, the second cavity, the third channel, the second capsule cavity, the third cavity, and the liquid outlet channel in sequence to form a "W"-shaped flow path.

[0004] With respect to the above-mentioned related technologies, the inventors believe that the flow path of the series diaphragm pump is too complicated, and more pressure loss will be generated during the solution transmission process, resulting in lower pressure. Summary of the invention

[0005] In order to improve the problem of low pressure caused by complex flow path of series diaphragm pumps in the related art, the present application provides a series diaphragm pump.

[0006] The present application provides a series diaphragm pump adopts the following technical solution:

[0007] A series diaphragm pump, comprising:

[0008] A diaphragm assembly, the diaphragm assembly comprising a top seat, a valve seat and a diaphragm seat connected in sequence, the top seat being provided with an inlet and an outlet, the valve seat being provided with an inlet hole communicating with the inlet and an outlet hole communicating with the outlet, the diaphragm seat being provided with a diaphragm, the diaphragm comprising a first movable bladder and a second movable bladder being connected, the first movable bladder being provided with a first bladder chamber communicating with the inlet hole, the second movable bladder being provided with a second bladder chamber communicating with the outlet hole, the diaphragm being provided with a check valve enabling fluid to flow only from the first bladder chamber to the second bladder chamber, the valve seat being provided with a first one-way valve enabling fluid to flow only from the inlet hole to the first bladder chamber in one direction, and a second one-way valve enabling fluid to flow only from the second bladder chamber to the outlet hole in one direction;

[0009] The driving component is connected to the diaphragm and can drive the first movable bladder and the second movable bladder to move up and down alternately.

[0010] By adopting the above technical solution, when the diaphragm pump is in operation, the driving component drives the first movable bag and the second movable bag to move up and down alternately. When the first movable bag moves downward, the second movable bag moves upward, the space of the first bag chamber becomes larger and a negative pressure is formed inside. At this time, the first one-way valve opens under the action of the pressure difference to connect the inlet hole with the first bag chamber. Under the action of the pressure difference, the fluid enters the first bag chamber through the inlet and the inlet hole. With the drive of the driving component, the first movable bag gradually moves upward, and the second movable bag gradually moves downward. The space of the first bag chamber becomes smaller and the internal pressure increases. The one-way valve blocks the inlet hole to prevent the fluid from flowing back from the inlet hole. Under the action of pressure, the check valve opens to connect the first capsule chamber with the second capsule chamber, and the fluid in the first capsule chamber flows into the second capsule chamber. With the drive of the driving component, the first active capsule moves downward and the second active capsule moves upward. The negative pressure formed inside the first active capsule causes the check valve to separate the first capsule chamber from the second capsule chamber. As the space of the second capsule chamber gradually becomes smaller, the pressure in the second capsule chamber gradually increases, and then the second one-way valve is opened. The fluid flows out from the outlet through the outlet under the action of pressure, and the fluid is transported in this cycle.

[0011] When the diaphragm pump of the present application is in operation, the fluid flows through the inlet, the inlet hole, the first capsule chamber, the second capsule chamber, the outlet hole, and the outlet in sequence to form a "U"-shaped flow path. Compared with the "W"-shaped flow path, the fluid transportation is simpler, the flow path is shorter, and the pressure loss during the fluid transportation process is smaller, so that there is a greater pressure during the fluid transportation process, which is conducive to the transportation of the fluid; and the simplification of the flow path also greatly reduces the difficulty of industrial production implementation, the production process is simple, the cost is lower, the product failure rate is low, and it is not easy to damage.

[0012] Optionally, the top seat is sealingly connected to the valve seat.

[0013] By adopting the above technical solution, the sealed connection between the top seat and the valve seat can avoid fluid leakage and pressure leakage, and prevent additional pressure loss during fluid transportation.

[0014] Optionally, the top seat is welded and sealed to the valve seat.

[0015] By adopting the above technical solution, the sealing method of welding the top seat and the valve seat has a good sealing effect and a stable sealing effect.

[0016] Optionally, a sealing gasket is arranged between the top seat and the valve seat, and the sealing gasket is provided with a liquid inlet hole correspondingly connected to the inlet hole and a liquid outlet hole correspondingly connected to the outlet hole.

[0017] By adopting the above technical solution, the sealing process between the top seat and the valve seat using a sealing gasket is easy and convenient to separate the top seat and the valve seat for maintenance; the liquid inlet hole is used to keep the inlet connected to the inlet hole, and the liquid outlet hole is used to keep the outlet connected to the outlet hole.

[0018] Optionally, a liquid inlet cavity connected to the inlet and a liquid outlet cavity connected to the outlet are provided at the bottom of the top seat, the inlet is connected to the inlet hole through the liquid inlet cavity, and the outlet is connected to the outlet hole through the liquid outlet cavity.

[0019] By adopting the above technical solution, during the fluid transportation process, the fluid will fill the liquid inlet cavity and the liquid outlet cavity, thereby ensuring that the fluid can continuously and stably enter the first capsule chamber and flow out from the outlet.

[0020] Optionally, the first one-way valve and the second one-way valve are both provided with fixing heads, the valve seat is provided with mounting holes corresponding to the first one-way valve and the second one-way valve one by one, and the fixing heads are clamped in the mounting holes.

[0021] By adopting the above technical solution, the first one-way valve and the second one-way valve are installed by connecting the fixed head with the mounting hole, so that the first one-way valve and the second one-way valve can be disassembled and assembled, which is convenient for replacing the first one-way valve and the second one-way valve when they are aged and damaged.

[0022] Optionally, an elastic sealing ring is provided on the diaphragm, the first movable bag, the second movable bag and the check valve are all located in the inner area of ​​the elastic sealing ring, and the valve seat abuts against the elastic sealing ring.

[0023] By adopting the above technical solution, the valve seat is pressed against the elastic sealing ring during installation, and the elastic sealing ring will deform and use the deformation to seal the area between the valve seat and the diaphragm located between the first movable bag and the second movable bag to prevent fluid leakage and pressure loss.

[0024] Optionally, a check cavity is provided on the diaphragm, the check cavity is located in the inner area of ​​the elastic sealing ring, the check valve is arranged at the top of the check cavity and a conducting port is formed between the check valve and the top opening of the check cavity, and the check cavity is connected to the second capsule chamber through the conducting port.

[0025] By adopting the above technical solution, the setting of the check cavity makes it easier for the check valve to deform and form a larger flow channel, which makes it easier for the fluid to flow into the second chamber and reduces the resistance encountered by the fluid when flowing into the second chamber through the check valve.

[0026] Optionally, the check cavity extends downward from the top of the diaphragm and passes through the bottom of the diaphragm.

[0027] By adopting the above technical solution, the difficulty of processing the check chamber is greatly reduced, the check valve is easier to process and shape, and the production cost is reduced.

[0028] Optionally, a convex ring is provided on the diaphragm seat, the diaphragm abuts against the convex ring, and the check cavity is located in the convex ring.

[0029] By adopting the above technical solution, the diaphragm abuts against the convex ring during installation, the diaphragm will be deformed and abut against the convex ring to achieve sealing of the bottom of the check cavity, preventing fluid from leaking from the gap between the diaphragm seat and the diaphragm.

[0030] In summary, the present application includes at least one of the following beneficial technical effects:

[0031] 1. When the diaphragm pump of the present application is in operation, the fluid flows through the inlet, the inlet hole, the first capsule chamber, the second capsule chamber, the outlet hole, and the outlet in sequence to form a "U"-shaped flow path. Compared with the "W"-shaped flow path, the fluid transportation is simpler, the flow path is shorter, and the pressure loss during the fluid transportation process is smaller, so that there is a greater pressure during the fluid transportation process, which is conducive to the transportation of the fluid; and the simplification of the flow path also greatly reduces the difficulty of industrial production implementation, the production process is simple, the cost is lower, the product failure rate is low, and it is not easy to damage;

[0032] 2. By setting up a buffer cavity, during the fluid delivery process, the fluid will fill the buffer cavity, thereby ensuring that the fluid can continuously and stably enter the first capsule chamber and flow out of the outlet;

[0033] 3. By setting the check cavity, the check valve is more likely to deform and form a larger flow channel, which makes it easier for the fluid to flow into the second capsule chamber, thereby reducing the resistance encountered by the fluid when flowing into the second capsule chamber through the check valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic diagram of Example 1 of the present application;

[0035] Figure 2 is an explosion diagram of Example 1 of the present application;

[0036] Figure 3 is an exploded schematic diagram of the diaphragm assembly of Example 1 of the present application;

[0037] Figure 4 is an exploded schematic diagram of the diaphragm assembly of Example 1 of the present application from another perspective;

[0038] Figure 5 is a cross-sectional schematic diagram of Example 1 of the present application;

[0039] Figure 6 It is an exploded schematic diagram of the top seat, the sealing gasket, and the valve seat of Example 2 of the present application;

[0040] Description of reference numerals:

[0041] 1. Top seat; 11. Inlet; 12. Outlet; 13. Liquid inlet cavity; 14. Liquid outlet cavity;

[0042] 2. Valve seat; 21. Inlet hole; 22. Outlet hole; 23. First one-way valve; 24. Second one-way valve; 25. Fixed head; 26. Mounting hole; 27. First groove; 28. Second groove;

[0043] 3. Diaphragm seat; 31. convex ring;

[0044] 4. diaphragm; 41. first movable capsule; 411. first capsule chamber; 42. second movable capsule; 421. second capsule chamber; 43. check valve; 44. check cavity; 441. conduction port; 45. elastic sealing ring;

[0045] 5. Sealing gasket; 51. Liquid inlet hole; 52. Liquid outlet hole;

[0046] 61. base; 62. motor; 63. eccentric wheel; 64. connecting rod; 65. guide needle;

[0047] 7. Buckle;

[0048] 8. Card slot. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments for understanding the inventive concept of the present application, and cannot represent all the embodiments, nor are they interpreted as the only embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field on the premise of understanding the inventive concept of the present application are within the scope of protection of the present application.

[0050] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0051] The embodiment of the present application discloses a series diaphragm pump, which aims to simplify the flow path inside the series diaphragm pump to provide a higher pressure to transport fluid.

[0052] Example 1

[0053] Reference Figure 1 The tandem diaphragm pump includes a diaphragm assembly and a drive assembly. The diaphragm assembly is used to transport fluid. The drive assembly cooperates with the diaphragm assembly to provide pressure to transport the fluid in the diaphragm assembly. The diaphragm assembly includes a top seat 1, a valve seat 2 and a diaphragm seat 3 connected in sequence.

[0054] Reference Figure 2 and Figure 3 The top seat 1 is provided with an inlet 11 and an outlet 12 , and the valve seat 2 is provided with an inlet hole 21 corresponding to and connected with the inlet 11 and an outlet hole 22 corresponding to and connected with the outlet 12 .

[0055] A diaphragm 4 is mounted on the diaphragm seat 3. In this embodiment, the diaphragm 4 is made of rubber. In other embodiments, the diaphragm 4 may also be made of a material with good elasticity such as silicone.

[0056] Reference Figure 3 The diaphragm 4 includes a first movable capsule 41 and a second movable capsule 42 connected to each other. The top of the first movable capsule 41 is recessed downward to form a first capsule chamber 411 corresponding to and connected to the inlet hole 21, and the top of the second movable capsule 42 is recessed downward to form a second capsule chamber 421 corresponding to and connected to the outlet hole 22.

[0057] Reference Figure 3 and Figure 4The top of the diaphragm 4 is located between the first active bladder 41 and the second active bladder 42 and is recessed downward to form a check cavity 44. The top of the inner wall of the check cavity 44 close to the first capsule chamber 411 is connected to a check valve 43. The check valve 43 and the diaphragm 4 are integrated. A conducting port 441 is formed between the check valve 43 and the top opening of the check cavity 44. The check cavity 44 is connected to the second capsule chamber 421 through the conducting port 441. The check valve 43 allows the fluid to flow only from the first capsule chamber 411 to the second capsule chamber 421.

[0058] Reference Figure 4 The bottom of the valve seat 2 is provided with a first groove 27 communicating with the first capsule chamber 411 and a second groove 28 communicating with the second capsule chamber 421. The second groove 28 is in communication with the second capsule chamber 421 and the check chamber 44. When the check valve 43 is opened, the first capsule chamber 411 is in communication with the check chamber 44 through the first groove 27. When the check valve 43 is closed, the connection between the first groove 27 and the check chamber 44 is sealed by the check valve 43.

[0059] Reference Figure 3 and Figure 4 The valve seat 2 is provided with a first one-way valve 23 that allows the fluid to flow only from the inlet hole 21 to the first chamber 411 in one direction, and a second one-way valve 24 that allows the fluid to flow only from the second chamber 421 to the outlet hole 22 in one direction. In this embodiment, the first one-way valve 23 and the second one-way valve 24 are both made of rubber material. In other embodiments, the first one-way valve 23 and the second one-way valve 24 can also be made of a material with good elasticity such as silica gel.

[0060] The first one-way valve 23 and the second one-way valve 24 are both connected to a fixing head 25 , and the valve seat 2 is provided with mounting holes 26 corresponding to the first one-way valve 23 and the second one-way valve 24 . The first one-way valve 23 and the second one-way valve 24 are installed by clamping the fixing head 25 into the mounting hole 26 .

[0061] Reference Figure 2 The driving assembly includes a base 61 connected to the diaphragm seat 3, a motor 62 fixedly installed in the base 61 by bolts, an eccentric wheel 63 fixedly connected to the output shaft of the motor 62, a connecting rod 64 connected to the diaphragm 4, and a guide pin 65 connecting the eccentric wheel 63 and the connecting rod 64. The first movable bag 41 and the second movable bag 42 are respectively connected to the two ends of the connecting rod 64.

[0062] The guide needle 65 is inclined along the direction approaching the connecting rod 64 and gradually toward the axial direction of the output shaft of the motor 62. One end of the guide needle 65 is fixedly connected to the eccentric wheel 63, and the other end of the guide needle 65 penetrates into the connecting rod 64 from the center of the bottom of the connecting rod 64 and rotates with the connecting rod 64.

[0063] Reference Figure 1The top seat 1, the valve seat 2, the diaphragm seat 3 and the base 61 are fixed by a buckle 7. The outer walls of the top seat 1, the valve seat 2, the diaphragm seat 3 and the base 61 are provided with a slot 8 that matches the buckle 7. The buckle 7 is snapped into the slot 8 to fix the top seat 1, the valve seat 2, the diaphragm seat 3 and the base 61 in connection.

[0064] Reference Figure 5 When the diaphragm pump is running, the motor 62 drives the eccentric wheel 63 to rotate, so that the guide needle 65 and the connecting rod 64 rotate and cooperate to drive the first movable capsule 41 and the second movable capsule 42 to move up and down alternately. When the first movable capsule 41 moves downward, the second movable capsule 42 moves upward, and negative pressure is formed inside the first capsule chamber 411, so that the first one-way valve 23 opens under the action of the pressure difference, and the inlet hole 21 is connected with the first capsule chamber 411. The fluid enters the first capsule chamber 411 under the action of the pressure difference. At this time, the check valve 43 will be closed. As the motor 62 rotates, the first movable capsule 41 gradually moves upward, and the second movable capsule 42 gradually moves downward. The pressure inside the first capsule chamber 411 increases, and the first one-way valve 23 blocks the inlet hole 21. Under the action of pressure, The check valve 43 opens to connect the first capsule chamber 411 with the second capsule chamber 421, and the fluid flows from the first capsule chamber 411 to the second capsule chamber 421. As the motor 62 continues to rotate, the first movable capsule 41 moves downward and the second movable capsule 42 moves upward. The negative pressure formed inside the first movable capsule 41 causes the check valve 43 to separate the first capsule chamber 411 from the second capsule chamber 421. The pressure in the second capsule chamber 421 gradually increases, thereby opening the second check valve 24, and the fluid flows out from the outlet 12 under the action of pressure. This cycle realizes the fluid transportation.

[0065] Reference Figure 4 The bottom of the top seat 1 is recessed upward to form a liquid inlet cavity 13 connected to the inlet 11 and a liquid outlet cavity 14 connected to the outlet 12. The inlet 11 is connected to the inlet hole 21 through the liquid inlet cavity 13, and the outlet 12 is connected to the outlet hole 22 through the liquid outlet cavity 14. During the fluid transportation process, the fluid will fill the liquid inlet cavity 13 and the liquid outlet cavity 14, so that the fluid can continuously and stably enter the first capsule chamber 411 and flow out from the outlet 12, effectively reducing the phenomenon of intermittent fluid suction into the diaphragm pump or intermittent fluid out of the diaphragm pump.

[0066] Reference Figure 5 In order to improve the sealing inside the diaphragm assembly to avoid fluid leakage and pressure leakage, the top seat 1 is sealed with the valve seat 2, and the valve seat 2 is sealed with the diaphragm seat 3, thereby preventing additional pressure loss during fluid transportation.

[0067] In this embodiment, the top seat 1 and the valve seat 2 are sealed by welding, which has good and stable sealing effect, and realizes the separation of the liquid inlet chamber 13 and the liquid outlet chamber 14 and the sealing of the edge connection between the top seat 1 and the valve seat 2.

[0068] Reference Figure 3 , an elastic sealing ring 45 is provided on the diaphragm 4. The elastic sealing ring 45 and the diaphragm 4 are made of the same material and are integrally formed. The first movable capsule 41, the second movable capsule 42, the first groove 27, the second groove 28, and the check valve 43 are all located in the inner area of ​​the elastic sealing ring 45. During installation, the valve seat 2 will be pressed against the elastic sealing ring 45, and the elastic sealing ring 45 will deform and use the deformation to seal the connection between the valve seat 2 and the edge of the diaphragm 4, so that the fluid can only flow along the first capsule chamber 411, the check cavity 44, and the second capsule chamber 421.

[0069] Reference Figure 4 In order to reduce the difficulty of processing the check chamber 44 and the check valve 43, the check chamber 44 extends downward from the top of the diaphragm 4 and passes through the bottom of the diaphragm 4, which greatly reduces the difficulty of processing and is conducive to reducing production costs.

[0070] Reference Figure 3 In order to prevent the fluid from leaking from the gap between the bottom of the check chamber 44 and the diaphragm seat 3, a convex ring 31 is provided on the diaphragm seat 3. The check chamber 44 is located in the convex ring 31. The convex ring 31 and the diaphragm seat 3 are integrated. When installed, the diaphragm 4 abuts against the convex ring 31. The diaphragm 4 will deform and abut against the convex ring 31 to achieve sealing of the bottom of the check chamber 44, avoiding additional pressure loss.

[0071] The implementation principle of Example 1 is as follows: when the diaphragm pump is running, the driving assembly drives the first movable capsule 41 and the second movable capsule 42 to move up and down alternately. When the first movable capsule 41 moves downward, the second movable capsule 42 moves upward, the space of the first capsule chamber 411 becomes larger and negative pressure is formed inside. At this time, the first one-way valve 23 opens under the action of the pressure difference to connect the inlet hole 21 with the first capsule chamber 411, and the fluid enters the first capsule chamber 411 through the inlet 11 and the inlet hole 21 under the action of the pressure difference. With the driving of the driving assembly, the first movable capsule 41 gradually moves upward, and the second movable capsule 42 gradually moves downward, the space of the first capsule chamber 411 becomes smaller and the internal pressure increases, the first one-way valve 23 blocks the inlet hole 21 to prevent the fluid from flowing back from the inlet hole 21, and under the action of pressure, the check valve 43 opens to connect the first capsule chamber 411, the check cavity 44, and the second capsule chamber 421, and the fluid in the first capsule chamber 411 flows into the second capsule chamber 421 through the check cavity 44. With the driving of the driving assembly, the first movable capsule 41 moves downward, and the negative pressure formed inside the first movable capsule 41 causes the check valve 43 to separate the first capsule chamber 411 from the check cavity 44. During this process, the second movable capsule 42 moves upward. As the space of the second capsule chamber 421 gradually decreases, the pressure in the second capsule chamber 421 gradually increases, and then the second check valve 24 is opened. Under the action of pressure, the fluid flows out from the outlet 12 through the outlet hole 22, and the fluid is transported in this cycle. When the diaphragm pump is running, the fluid flows through the inlet 11, the inlet hole 21, the first capsule chamber 411, the second capsule chamber 421, the outlet hole 22, and the outlet 12 in sequence to form a "U"-shaped flow path. Compared with the "W"-shaped flow path, the fluid transportation is simpler, the flow path is shorter, and the pressure loss during the fluid transportation process is smaller, so that there is a greater pressure during the fluid transportation process, which is conducive to the transportation of the fluid; and the simplification of the flow path also greatly reduces the difficulty of industrial production implementation, the production process is simple, the cost is lower, the product failure rate is low, and it is not easy to damage. In practical applications, the fluid can be liquid or gas.

[0072] Example 2

[0073] Reference Figure 6 The difference between this embodiment and embodiment 1 is that the top seat 1 and the valve seat 2 are sealed by a sealing gasket 5, and the sealing gasket 5 is installed between the top seat 1 and the valve seat 2. The sealing gasket 5 is provided with a liquid inlet hole 51 and a liquid outlet hole 52. The liquid inlet hole 51 is opposite to and connected with the liquid inlet hole 21, and the liquid outlet hole 52 is opposite to and connected with the outlet hole 22.

[0074] In this embodiment, the sealing gasket 5 is made of rubber material. In other embodiments, the sealing gasket 5 can also be made of materials with good elasticity such as silicone.

[0075] During installation, the top seat 1 is pressed against the valve seat 2, and the sealing gasket 5 is deformed due to the extrusion between the top seat 1 and the valve seat 2, thereby separating the liquid inlet cavity 13 and the liquid outlet cavity 14. The sealing gasket 5 is used to seal between the top seat 1 and the valve seat 2, so that the top seat 1 and the valve seat 2 can be separated for maintenance. The liquid inlet hole 51 is used to keep the inlet 11 connected with the inlet hole 21, and the liquid outlet hole 52 is used to keep the outlet 12 connected with the outlet hole 22.

[0076] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A series diaphragm pump, characterized in that: include: A diaphragm assembly, the diaphragm assembly comprising a top seat (1), a valve seat (2) and a diaphragm seat (3) connected in sequence, the top seat (1) being provided with an inlet (11) and an outlet (12), the valve seat (2) being provided with an inlet hole (21) communicating with the inlet (11) and an outlet hole (22) communicating with the outlet (12), the diaphragm seat (3) being provided with a diaphragm (4), the diaphragm (4) comprising a first movable bladder (41) and a second movable bladder (42) connected to each other, the first movable bladder (41) being provided with a diaphragm hole (21) communicating with the inlet hole (21), ), the second movable capsule (42) is provided with a second capsule chamber (421) which is connected to the outlet hole (22), the diaphragm (4) is provided with a check valve (43) which allows the fluid to flow only from the first capsule chamber (411) to the second capsule chamber (421), the valve seat (2) is provided with a first check valve (23) which allows the fluid to flow only from the inlet hole (21) to the first capsule chamber (411) in one direction, and a second check valve (24) which allows the fluid to flow only from the second capsule chamber (421) to the outlet hole (22); A driving component, the driving component is connected to the diaphragm (4) and can drive the first movable bladder (41) and the second movable bladder (42) to move up and down alternately; An elastic sealing ring (45) is provided on the diaphragm (4); the first movable bag (41), the second movable bag (42) and the check valve (43) are all located in the inner area of ​​the elastic sealing ring (45); and the valve seat (2) abuts against the elastic sealing ring (45); The diaphragm (4) is provided with a check cavity (44), the check cavity (44) is located in the inner area of ​​the elastic sealing ring (45), the check valve (43) is arranged at the top of the check cavity (44) and forms a conducting port (441) with the opening of the top of the check cavity (44), and the check cavity (44) is connected to the second capsule chamber (421) through the conducting port (441); The check cavity (44) extends downward from the top of the diaphragm (4) and penetrates the bottom of the diaphragm (4); The bottom of the top seat (1) is provided with a liquid inlet cavity (13) connected to the inlet (11) and a liquid outlet cavity (14) connected to the outlet (12); the inlet (11) is connected to the inlet hole (21) through the liquid inlet cavity (13), and the outlet (12) is connected to the outlet hole (22) through the liquid outlet cavity (14).

2. The tandem diaphragm pump according to claim 1, characterized in that: The top seat (1) is sealedly connected to the valve seat (2).

3. The tandem diaphragm pump according to claim 2, characterized in that: The top seat (1) and the valve seat (2) are welded and sealed.

4. The tandem diaphragm pump according to claim 2, characterized in that: A sealing gasket (5) is provided between the top seat (1) and the valve seat (2), and the sealing gasket (5) is provided with a liquid inlet hole (51) correspondingly connected to the inlet hole (21) and a liquid outlet hole (52) correspondingly connected to the outlet hole (22).

5. The tandem diaphragm pump according to claim 1, characterized in that: The first one-way valve (23) and the second one-way valve (24) are both provided with a fixing head (25), the valve seat (2) is provided with a mounting hole (26) corresponding to the first one-way valve (23) and the second one-way valve (24), and the fixing head (25) is clamped in the mounting hole (26).

6. The tandem diaphragm pump according to claim 1, characterized in that: A convex ring (31) is provided on the diaphragm seat (3), the diaphragm (4) abuts against the convex ring (31), and the check cavity (44) is located inside the convex ring (31).

Images