CN110821798B

CN110821798B - Series diaphragm pump with non-return and anti-leakage functions

Info

Publication number: CN110821798B
Application number: CN201911135658.2A
Authority: CN
Inventors: 颜宏
Original assignee: Xiamen Conjoin Electronics Technology Co ltd
Current assignee: Xiamen Conjoin Electronics Technology Co ltd
Priority date: 2019-07-23
Filing date: 2019-11-19
Publication date: 2022-02-01
Anticipated expiration: 2039-11-19
Also published as: CN211900935U; CN211116526U; CN211116527U; CN211116524U; CN211258953U; CN211116525U; CN110821798A; CN211623672U; CN211116523U; CN211900934U; CN110821799A; CN110821799B

Abstract

The invention discloses a series diaphragm pump with non-return and anti-leakage functions, and relates to the technical field of diaphragm pumps. The diaphragm pump comprises a shell mechanism, a diaphragm mechanism, a driving mechanism and a non-return mechanism. Specifically, the housing mechanism comprises a support assembly, a diaphragm seat, and an upper cover; a first containing cavity, a second containing cavity and a third containing cavity are clamped 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 comprises a diaphragm, a first movable bag and a second movable bag which are connected in series; the diaphragm is provided with a first diaphragm and a second diaphragm, the first movable bag comprises a first bag cavity, the second movable bag is provided with a second bag cavity, the first channel and the second channel are respectively communicated with the first bag cavity, and the third channel and the third containing cavity are respectively communicated with the second bag cavity. The driving mechanism is used for driving the first movable bag and the second movable bag to alternately move up and down. The non-return mechanism is used for preventing the external solution from flowing back to the second capsule cavity.

Description

Series diaphragm pump with non-return and anti-leakage functions

Technical Field

The invention relates to the technical field of diaphragm pumps, in particular to a series diaphragm pump with non-return and anti-leakage functions.

Background

The diaphragm type liquid pump is driven by motor to make circular motion, and the diaphragm in the liquid pump is driven by mechanical device to make reciprocating motion, so that the air in the pump cavity can be compressed and stretched, and under the action of one-way valve plate a pressure difference can be produced between water outlet hole or water inlet and external atmospheric pressure, and under the action of pressure difference the water can be pressed into water inlet, and can be discharged from water outlet. The diaphragm liquid pump is well applied to occasions such as small household appliances, medical appliances and the like.

The existing diaphragm pump consists of a motor, an eccentric wheel, a steel needle, a curved bar, a lower seat, a bell-shaped seat, a bell shape, a middle layer plate, an umbrella shape, a diaphragm, an upper cover and a snap spring; after the motor is electrified to act, the eccentric wheel is driven to do umbrella-shaped motion, the bell-shaped motion is driven by the crank rod to do stretching and compressing motion, when the bell-shaped motion is done stretching motion, the space formed by the bell-shaped motion and the bell-shaped motion is vacuumized, the water inlet non-return umbrella-shaped motion is opened, and the water outlet diaphragm is closed; when the bell shape is compressed, the water inlet check umbrella shape is closed, and the water outlet diaphragm is opened. Thus, the fluid medium can flow from the water inlet end to the water outlet end and then flow out from the water outlet end. A single check valve is connected to the water outlet end, thus forming an anti-reflux and anti-drip system.

The existing diaphragm pump has the following defects:

(1): the existing diaphragm pump does not have a check system, and needs to be externally connected with a single check valve, so that the diaphragm pump is large in size, high in cost and low in assembly efficiency.

(2): the existing diaphragm pump adopts 2 umbrella-shaped valves and 1 diaphragm as a water inlet and outlet system, and the umbrella-shaped valves are easy to be sticky and easily cause the opening pressure of a water pump to be larger or the umbrella-shaped valves cannot be opened; and the umbrella-shaped valve has poor foreign matter passing capability, foreign matter particles with various sizes can be mixed in water in the actual use process, and the umbrella-shaped valve is easy to adsorb the particles when a water pump passes water, so that the water inlet and the water outlet are blocked, and the diaphragm pump cannot work.

(3): the two bell-shaped bags of the existing diaphragm pump are in a parallel structure, the vacuum degree and the maximum water pressure of a product are determined by the compression ratio of a single bag, so that the vacuum degree and the maximum water pressure of the product are relatively small.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a serial diaphragm pump with non-return and anti-leakage functions, which has stable opening pressure, accurate flow control and long-term stable operation.

In order to achieve the above purpose, the solution of the invention is:

the shell mechanism comprises a supporting component, a diaphragm seat supported on the supporting component, and an upper cover supported on the diaphragm seat and provided with a liquid inlet channel and a liquid outlet channel; a first cavity, a second cavity and a third cavity are clamped between the upper cover and the diaphragm seat, the liquid inlet channel can be communicated with the first cavity, and the liquid outlet channel can be communicated with the third cavity; the diaphragm seat is provided with a first channel communicated with the first cavity, and a second channel and a third channel which are respectively communicated with the second cavity;

a diaphragm mechanism including a diaphragm interposed between the upper cover and the diaphragm holder, and a first movable bag and a second movable bag supported on the support member and connected in series; the diaphragm is provided with a first diaphragm accommodated in the first accommodating cavity and a second diaphragm accommodated in the second accommodating cavity, the first movable bag comprises a first bag-shaped part provided with a first bag cavity, the second movable bag comprises a second bag-shaped part provided with a second bag cavity, the first channel and the second channel are respectively communicated with the first bag cavity, and the third channel and the third accommodating cavity are respectively communicated with the second bag cavity;

the driving mechanism is used for driving the first movable bag and the second movable bag to alternately move up and down;

the non-return mechanism comprises a non-return ball and a return spring, the non-return ball is supported at a first opening of the second bag cavity communicated with the third containing cavity, and the return spring is supported between the non-return ball and the upper cover;

the first movable bag moves downwards, can drive external solution to flow into the first bag cavity from the liquid inlet channel through the first cavity and the first channel, and can drive the second membrane to move downwards and seal the second channel; the second movable bag moves upwards, and can drive the solution in the cavity of the second bag to flow through the third cavity and flow out of the liquid outlet channel; the first movable bag moves upwards, the second movable bag moves downwards, the first diaphragm can be driven to move upwards and seal the liquid inlet channel, and the solution in the first bag cavity can be driven to flow into the second bag cavity through the second channel, the second cavity and the third channel.

Preferably, the first diaphragm and the second diaphragm are sheet-shaped geometric bodies which are disposed on the diaphragm and can move up and down and reset.

As a further optimization, the supporting component is internally provided with a containing cavity for containing the diaphragm mechanism, the supporting component comprises a base and a supporting seat supported on the base, and the diaphragm seat is supported on the supporting seat.

Preferably, the first movable bag includes a first movable rod disposed in the first bag-shaped portion and extending downward, the second movable bag includes a second movable rod disposed in the second bag-shaped portion and extending downward, and the first movable rod and the second movable rod are disposed in the driving mechanism, respectively.

Preferably, the driving mechanism includes a motor, and a T-shaped swinging member disposed at an output end of the motor and inclined inward, and the swinging member is capable of rotating relative to the output end of the motor.

As a further optimization, the housing mechanism includes a clamp spring for connecting the upper cover, the diaphragm seat, the support seat, and the base.

As a further optimization, the diaphragm seat is provided with a guide post which extends upwards and is positioned in the third cavity, the guide post is provided with a movable channel communicated with the first opening, and the check ball and the return spring are both positioned in the movable channel.

As a further optimization, the upper cover is provided with a movable groove matched with the return spring and the check ball, and the return spring is positioned in the movable groove.

As further optimization, the first opening is a conical opening with an upward opening, the included angle of the side surface of the first opening is 50-70 degrees, the distance between the tangent point of the check ball and the first opening and the bottom of the first opening is 0.1-0.2 mm, the water outlet efficiency of the angle and the distance is highest, and the foreign matter passing capacity is best.

By adopting the technical scheme, the invention can obtain the following technical effects:

the diaphragm pump has the advantages that the diaphragm pump can work stably for a long time, and the diaphragm mechanism cannot lose efficacy. Specifically, when the diaphragm pump works, the driving mechanism drives the first movable bag and the second movable bag to alternately move up and down, namely: the first movable bag moves downwards, and the second movable bag moves upwards; or the first movable bag moves upwards and the second movable bag moves downwards. The specific working principle is as follows:

when the first movable bag moves downwards, the first bag cavity can form a certain negative pressure and can drive external solution to flow into the first bag cavity from the liquid inlet channel through the first cavity and the first channel; and the negative pressure in the first capsule cavity can drive the second membrane to move downwards and seal the second channel, so that the solution in the second capsule cavity is prevented from flowing into the first capsule cavity. When the second movable bag moves upwards, the pressure in the second bag cavity is increased, and the solution in the second bag cavity can be driven to flow through the third cavity and flow out from the liquid outlet channel; and during this process the second membrane will further seal off the second passage due to the pressure in the second chamber.

When the first movable bag moves upwards and the second movable bag moves downwards, the pressure of the first bag cavity is increased, and the pressure of the first bag cavity is decreased to form negative pressure. Therefore, the first movable bag drives the first membrane to move upwards and seal the liquid inlet channel, and simultaneously jacks the second membrane, so that the solution in the first bag cavity can flow into the second bag cavity through the second channel, the second containing cavity and the third channel.

The diaphragm pump can stably pump the external solution through the liquid inlet channel and discharge the solution from the liquid outlet channel through the two steps. In the two steps, the first membrane and the second membrane can move up and down to respectively seal and open the liquid inlet channel and the second channel, and the first membrane and the second membrane can not generate failure effects such as stickiness and the like in the long-term working process, so that the long-term stable working of the diaphragm pump can be ensured.

Meanwhile, the first movable bag and the second movable bag are connected in series in the diaphragm pump, when the diaphragm pump works, the first movable bag and the second movable bag can move up and down in a staggered mode, the first bag cavity and the second bag cavity can be enabled to be staggered under the conditions of negative pressure and pressurization. Therefore, the first capsule cavity and the second capsule cavity can play a mutual assisting role, so that the first capsule cavity and the second capsule cavity can form larger negative pressure and pressurization, and the working power of the diaphragm pump is increased.

In addition, in this case, when the second movable bladder moves upward, the solution in the second bladder chamber pushes the check ball open and compresses the return spring. When the second movable bag moves downwards, the return spring drives the check ball to seal the first opening. It should be noted, of course, that the return spring also drives the check ball to seal the first opening when the diaphragm pump is not operating. Through the non-return mechanism, on one hand, better and more stable pressure can be ensured when the solution in the second capsule cavity is discharged. On the other hand, when the second sac cavity is under negative pressure, the external solution cannot flow back to the second sac cavity through the liquid outlet channel.

Compared with the existing diaphragm pump, the series diaphragm pump with the non-return and anti-leakage functions has the following advantages:

(1) the first diaphragm and the second diaphragm are designed on the diaphragm to serve as the check valve plates at the water inlet end and the water outlet end, and compared with the existing diaphragm pump which is provided with 2 umbrella-shaped diaphragms and 1 diaphragm, the diaphragm pump is simpler in structure and higher in mounting efficiency; the first film and the second film are less sticky than umbrella-shaped films and have a higher foreign matter passing ability.

(2) The first movable bag and the second movable bag are connected in series, and compared with a diaphragm pump with two bag bodies connected in parallel, the diaphragm pump can save space volume, improve water pumping efficiency, and greatly improve vacuum degree and maximum water pressure.

(3) Compared with the existing structure that a single check valve is required to be externally connected, the water outlet of the water-saving valve has the advantages of small volume, low cost, simple assembly and the like, and the product is favorable for integration and customization.

Drawings

FIG. 1 is a schematic axial side view of a diaphragm pump according to a first embodiment of the present invention;

FIG. 2 is a first schematic cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is an exploded view of a diaphragm pump according to a first embodiment of the present invention;

FIG. 4 is a second schematic cross-sectional view taken along line A-A of FIG. 1;

FIG. 5 is an exploded sectional view schematically showing a diaphragm pump according to a first embodiment of the present invention;

FIG. 6 is a schematic sectional view showing a diaphragm pump according to a second embodiment of the present invention;

the labels in the figure are:

1-a housing mechanism; 2-covering the upper cover; 3-a diaphragm seat; 4-a support assembly; 5-a support seat; 6-a base; 7-a return spring; 8-check ball; 9-a non-return mechanism; 10-a separator; 11-a first mobile bladder; 12-a second activity pouch; 13-a diaphragm mechanism; 14-a pendulum; 15-a motor; 16-a drive mechanism; 17-a liquid inlet channel; 18-a liquid outlet channel; 19-a first membrane; 20-a second membrane; 21-a first channel; 22-a second channel; 23-a third channel; 24-a first cavity; 25-a second cavity; 26-a third cavity; 27-a first capsule cavity; 28-a second capsule cavity; 29-a first balloon; 30-a first movable bar; 31-a second balloon; 32-a second movable bar; 33-a clamp spring; 34-a first opening; 35-a guide post; 36-an active channel; 37-movable groove.

Detailed Description

In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following specific examples.

The first embodiment:

as shown in fig. 1, fig. 2 and fig. 3, in this embodiment, a tandem diaphragm pump with check and anti-leakage functions includes:

the shell mechanism 1 comprises a support component 4, a diaphragm seat 3 supported on the support component 4, and an upper cover 2 supported on the diaphragm seat 3 and provided with a liquid inlet channel 17 and a liquid outlet channel 18; a first cavity 24, a second cavity 25 and a third cavity 26 are clamped between the upper cover 2 and the diaphragm seat 3, the liquid inlet channel 17 can be communicated with the first cavity 24, and the liquid outlet channel 18 can be communicated with the third cavity 26; the diaphragm seat 3 is provided with a first channel 21 communicated with the first cavity 24, and a second channel 22 and a third channel 23 respectively communicated with the second cavity 25;

a diaphragm mechanism 13 including a diaphragm 10 sandwiched between the upper cover 2 and the diaphragm holder 3, a first movable bag 11 and a second movable bag 12 supported on the support member 4 and connected in series; the diaphragm 10 is provided with a first diaphragm 19 accommodated in the first accommodating cavity 24 and a second diaphragm 20 accommodated in the second accommodating cavity 25, the first movable bag 11 comprises a first bag-shaped part 29 provided with a first bag cavity 27, the second movable bag 12 comprises a second bag-shaped part 31 provided with a second bag cavity 28, the first channel 21 and the second channel 22 are respectively communicated with the first bag cavity 27, and the third channel 23 and the third accommodating cavity 26 are respectively communicated with the second bag cavity 28;

a driving mechanism 16 for driving the first movable bag 11 and the second movable bag 12 to move up and down alternately;

the non-return mechanism 9 comprises a non-return ball 8 and a return spring 7, the non-return ball 8 is supported at a first opening 34 where the second capsule cavity 28 and the third cavity 26 are communicated, and the return spring 7 is supported between the non-return ball 8 and the upper cover 2;

the first movable bag 11 moves downwards, can drive external solution to flow into the first bag cavity 27 from the liquid inlet channel 17 through the first containing cavity 24 and the first channel 21, and can drive the second membrane 20 to move downwards and seal the second channel 22; the second movable bag 12 moves upwards to drive the solution in the second bag cavity 28 to flow through the third cavity 26 and flow out from the liquid outlet channel 18; the upward movement of the first movable bag 11 and the downward movement of the second movable bag 12 can drive the first membrane 19 to move upward and seal the liquid inlet channel 17, and can drive the solution in the first bag cavity 27 to flow into the second bag cavity 28 through the second channel 22, the second containing cavity 25 and the third channel 23.

Specifically, as shown in fig. 3 and 4, when the diaphragm pump of the present embodiment is in operation, the driving mechanism 16 will drive the first movable bag 11 and the second movable bag 12 to move up and down alternately, that is: the first movable bag 11 moves downwards, and the second movable bag 12 moves upwards; or the first movable bag 11 is moved upward and the second movable bag 12 is moved downward. Wherein, the diaphragm pump of this embodiment, concrete theory of operation is as follows:

a: when the first movable bag 11 moves downwards, the first bag cavity 27 can form a certain negative pressure, and can drive external solution to flow into the first bag cavity 27 from the liquid inlet channel 17 through the first accommodating cavity 24 and the first channel 21; and the negative pressure in the first capsule 27 can drive the second diaphragm 20 to move downwards and seal the second channel 22, so that the solution in the second capsule 28 is prevented from flowing into the first capsule 27. When the second movable bag 12 moves upwards, the pressure in the second bag cavity 28 will increase, and the solution in the second bag cavity 28 can be driven to flow through the third containing cavity 26 and flow out from the liquid outlet channel 18; and during this process will further allow the second diaphragm 20 to seal the second passage 22 due to the pressure in the second bladder 28.

B: when the first movable bag 11 moves upwards and the second movable bag 12 moves downwards, the pressure of the first bag cavity 27 is increased, and the pressure of the first bag cavity 27 is decreased to form negative pressure. Thus, the first movable bladder 11 will drive the first diaphragm 19 to move upward and seal the inlet channel 17, and will push the second diaphragm 20 open, so that the solution in the first bladder cavity 27 can flow into the second bladder cavity 28 through the second channel 22, the second cavity 25 and the third channel 23.

The diaphragm pump of this embodiment can stably pump the external solution through the inlet channel 17 and discharge the solution from the outlet channel 18 by the above-mentioned step A, B. In the two steps, the first membrane 19 and the second membrane 20 can move up and down to respectively seal and open the liquid inlet channel 17 and the second channel 22, and the first membrane 19 and the second membrane 20 can not generate failure effects such as stickiness and the like in the long-term working process, so that the long-term stable working of the diaphragm pump can be ensured.

Meanwhile, the first movable bag 11 and the second movable bag 12 of the diaphragm pump are connected in series, when the diaphragm pump works, the first movable bag 11 and the second movable bag 12 alternately move up and down, so that the first bag cavity 27 and the second bag cavity 28 are alternately under the conditions of negative pressure and pressurization. Therefore, the first capsule cavity 27 and the second capsule cavity 28 can play a mutual assisting role, so that the first capsule cavity 27 and the second capsule cavity 28 can form larger negative pressure and pressurization, and the power of the diaphragm pump is increased.

In addition, as shown in fig. 3 and 4, in this embodiment, when the second movable bag 12 moves upward, the solution in the second bag chamber 28 pushes the check ball 8 open and compresses the return spring 7. When the second movable bag 12 moves downwards, the return spring 7 drives the check ball 8 to seal the first opening 34. It should be noted, of course, that the return spring 7 also drives the check ball 8 to seal the first opening 34 when the diaphragm pump is not operating. By means of the above-mentioned non-return mechanism 9, it is on the one hand possible to ensure a better and more stable pressure when the solution of the second chamber 28 is discharged. On the other hand, when the second capsule 28 is under negative pressure, the external solution does not flow back to the second capsule 28 through the liquid outlet channel 18.

In the present embodiment, as shown in fig. 4, the diaphragm seat 3 is provided with a guide post 35 extending upward and located in the third cavity 26, the guide post 35 is provided with a movable passage 36 communicated with the first opening 34, and the check ball 8 and the return spring 7 are both located in the movable passage 36. When the second movable bag 12 moves upward, the solution in the second bag cavity 28 pushes the check ball 8 open, allowing the check ball 8 to move upward along the movable passage 36 and compress the return spring 7. When the second movable bag 12 moves downwards, the return spring 7 drives the check ball 8 to move downwards along the movable channel 36 to seal the first opening 34. In the present embodiment, the check ball 8 is a steel ball. In another embodiment, the check ball 8 may be a ball made of other materials.

In addition, in the present embodiment, the first opening 34 is a tapered opening with an upward opening, the angle J included by the side surface of the first opening 34 is 60 °, and the distance L from the tangent point of the check ball 8 to the first opening 34 to the bottom of the first opening 34 is 0.15 mm. In another embodiment, the included angle J between the side surfaces of the first opening 34 may be 50 to 70 degrees, and the tangent point of the check ball 8 and the first opening 34 may be 0.1 to 0.2mm from the bottom of the first opening 34. The first opening 34 with the structure and parameters has good foreign matter passing capacity while ensuring good water outlet efficiency.

As shown in fig. 3, in the present embodiment, the first diaphragm 19 and the second diaphragm 20 are sheet-like geometric bodies that are disposed on the diaphragm 10 and can be moved up and down and reset. In particular, the diaphragm 10 is a flexible sealing material such as: the sheet-shaped geometric body is made of silica gel, NBR and the like. Wherein, first diaphragm 19 and second diaphragm 20 set up on diaphragm 10 through fretwork gimmick, and first diaphragm 19 and second diaphragm 20 receive the exogenic action, can realize upwards and suitable deformation activity downwards. As shown in fig. 4, the diaphragm 10 is sandwiched between the upper cover 2 and the diaphragm seat 3, which not only seals the edges of the upper cover 2 and the diaphragm seat 3, but also relatively isolates the first cavity 24, the second cavity 25 and the third cavity 26, so that the first cavity 24, the second cavity 25 and the third cavity 26 cannot be communicated with each other through end surfaces.

As shown in fig. 2, in the present embodiment, the supporting assembly 4 is provided with a cavity for accommodating the diaphragm mechanism 13, the supporting assembly 4 includes a base 6 and a supporting seat 5 supported on the base 6, and the diaphragm seat 3 is supported on the supporting seat 5. In particular, the base 6 is in turn supported on a motor 15, and the support assembly 4 may function to protect the diaphragm mechanism 13 and the drive mechanism 16.

As shown in fig. 3, in the present embodiment, the first movable bag 11 includes a first movable bar 30 disposed in the first bag-shaped portion 29 and extending downward, the second movable bag 12 includes a second movable bar 32 disposed in the second bag-shaped portion 31 and extending downward, and the first movable bar 30 and the second movable bar 32 are disposed in the drive mechanism 16, respectively. As shown in fig. 2 and 3, the driving mechanism 16 includes a motor 15, and a swinging member 14 disposed at an output end of the motor 15 and having a "T" shape, the swinging member 14 being capable of rotating relative to the output end of the motor 15. The first movable lever 30 and the second movable lever 32 are disposed at both left and right ends of the upper portion of the swinging member 14. When the motor 15 rotates, the swinging member 14 is disposed at the output end of the motor 15 in an inclined manner, and the swinging member 14 can rotate relative to the output end of the motor 15, so that the swinging member 14 will tilt back and forth.

As shown in fig. 1 and 5, in the present embodiment, the housing mechanism 1 includes a pair of clamp springs 33 respectively sleeved on the left and right sides of the housing mechanism 1, and the clamp springs 33 can connect and clamp the upper cover 2, the diaphragm seat 3, the support seat 5, and the base 6 together.

Second embodiment:

as shown in fig. 6, in the present embodiment, the backstop mechanism 9 also includes a check ball 8 and a return spring 7. Specifically, the upper cover 2 is provided with a movable groove 37 matched with the return spring 7 and the check ball 8, and the return spring 7 is positioned in the movable groove 37. When the second movable bag 12 moves upward, the solution in the second bag cavity 28 pushes the check ball 8 open, allowing the check ball 8 to move upward and compress the return spring 7. When the second movable bag 12 moves downwards, the return spring 7 drives the check ball 8 to move downwards to seal the first opening 34. Wherein the movable groove 37 may function to position the return spring 7. Meanwhile, compared with the first embodiment, the movable groove 37 of the present embodiment is a groove that is inverted in the upper cover 2, so that foreign matters are not accumulated, the foreign matter passing capability is stronger, and the non-return mechanism 9 can stably work for a long time.

In addition, other structures of the diaphragm pump of this embodiment are the same as those of the first embodiment, and are not described herein again.

The above embodiments and drawings are not intended to limit the form and style of the present invention, and any suitable changes or modifications thereof by those skilled in the art should be considered as not departing from the scope of the present invention.

Claims

1. The utility model provides a take series connection diaphragm pump of non return and antiseep function which characterized in that contains:

the shell mechanism (1) comprises a supporting component (4), a diaphragm seat (3) supported on the supporting component (4), and an upper cover (2) supported on the diaphragm seat (3) and provided with a liquid inlet channel (17) and a liquid outlet channel (18); a first cavity (24), a second cavity (25) and a third cavity (26) are clamped between the upper cover (2) and the diaphragm seat (3), the liquid inlet channel (17) can be communicated with the first cavity (24), and the liquid outlet channel (18) can be communicated with the third cavity (26); the diaphragm seat (3) is provided with a first channel (21) communicated with the first cavity (24), and a second channel (22) and a third channel (23) respectively communicated with the second cavity (25); the diaphragm mechanism (13) comprises a diaphragm (10) clamped between the upper cover (2) and the diaphragm seat (3), the diaphragm (10) enables the first containing cavity (24), the second containing cavity (25) and the third containing cavity (26) to be relatively isolated, and the first containing cavity (24), the second containing cavity (25) and the third containing cavity (26) cannot be communicated through end faces; a first mobile bag (11) and a second mobile bag (12) supported in series on the support assembly (4); the diaphragm (10) is provided with a first diaphragm (19) accommodated in the first accommodating cavity (24) and a second diaphragm (20) accommodated in the second accommodating cavity (25), the first movable bag (11) comprises a first bag-shaped part (29) provided with a first bag cavity (27), the second movable bag (12) comprises a second bag-shaped part (31) provided with a second bag cavity (28), the first channel (21) and the second channel (22) are respectively communicated with the first bag cavity (27), the third channel (23) and the third accommodating cavity (26) are respectively communicated with the second bag cavity (28), and the first diaphragm (19) and the second diaphragm (20) are sheet-shaped geometric bodies which are configured on the diaphragm (10) and can move up and down and reset;

a driving mechanism (16) for driving the first movable bag (11) and the second movable bag (12) to move up and down alternately;

the non-return mechanism (9) comprises a non-return ball (8) and a return spring (7), the non-return ball (8) is supported at a first opening (34) where the second bag cavity (28) is communicated with the third containing cavity (26), the return spring (7) is supported between the non-return ball (8) and the upper cover (2), the first opening (34) is a conical opening with an upward opening, an angle formed by the side surface of the first opening (34) is 50-70 degrees, and the distance between the tangent point of the non-return ball (8) and the first opening (34) and the bottom of the first opening (34) is 0.1-0.2 mm;

the first movable bag (11) moves downwards, can drive external solution to flow into the first bag cavity (27) from the liquid inlet channel (17) through the first cavity (24) and the first channel (21), and can drive the second membrane (20) to move downwards and seal the second channel (22); the second movable bag (12) moves upwards to drive the solution in the second bag cavity (28) to flow out from the liquid outlet channel (18) through the third cavity (26), and in the process, the second membrane (20) can further seal the second channel (22) due to the pressure in the second bag cavity (28); the first movable bag (11) moves upwards, the second movable bag (12) moves downwards, the first membrane (19) can be driven to move upwards and seal the liquid inlet channel (17), meanwhile, the second membrane (20) is pushed open, and the solution in the first bag cavity (27) can be driven to flow into the second bag cavity (28) through the second channel (22), the second containing cavity (25) and the third channel (23).

2. The tandem diaphragm pump with check and anti-leakage functions as claimed in claim 1, wherein: the supporting component (4) is internally provided with a containing cavity for containing the diaphragm mechanism (13), the supporting component (4) comprises a base (6) and a supporting seat (5) supported on the base (6), and the diaphragm seat (3) is supported on the supporting seat (5).

3. The tandem diaphragm pump with check and anti-leakage functions as claimed in claim 1, wherein: the first movable bag (11) includes a first movable rod (30) disposed in the first bag-shaped portion (29) and extending downward, the second movable bag (12) includes a second movable rod (32) disposed in the second bag-shaped portion (31) and extending downward, and the first movable rod (30) and the second movable rod (32) are disposed in the drive mechanism (16), respectively.

4. The tandem diaphragm pump with check and anti-leakage functions as claimed in claim 1, wherein: the driving mechanism (16) comprises a motor (15) and a T-shaped swinging piece (14) which is arranged at the output end of the motor (15) in an inward inclining way, and the swinging piece (14) can rotate relative to the output end of the motor (15).

5. The tandem diaphragm pump with the function of stopping back and preventing leakage of claim 2, wherein: the shell mechanism (1) comprises a clamp spring (33) which is used for connecting the upper cover (2), the diaphragm seat (3), the supporting seat (5) and the base (6).

6. The tandem diaphragm pump with check and anti-leakage functions as claimed in claim 1, wherein: the diaphragm seat (3) is provided with a guide post (35) which extends upwards and is positioned in the third accommodating cavity (26), the guide post (35) is provided with a movable channel (36) communicated with the first opening (34), and the check ball (8) and the return spring (7) are both positioned in the movable channel (36).

7. The tandem diaphragm pump with check and anti-leakage functions as claimed in claim 1, wherein: the upper cover (2) is provided with a movable groove (37) matched with the return spring (7) and the check ball (8), and the return spring (7) is located in the movable groove (37).