Diaphragm pump structure

Abstract

The utility model discloses a diaphragm pump structure. The diaphragm pump structure comprises a pump body; the one-way valve body is arranged on one side of the pump body; the liquid inlet one-way valve is arranged between the pump body and the one-way valve body; the liquid outlet one-way valve is arranged between the pump body and the one-way valve body; the diaphragms are arranged in the pump cavities of the pump body; the diaphragm driving mechanism is arranged on the other side of the pump body and is used for driving each diaphragm to reciprocate; the liquid inlet one-way valve and / or the liquid outlet one-way valve are / is diaphragm type one-way valves. The liquid inlet one-way valve and the liquid outlet one-way valve are diaphragm type one-way valves, fit and separation between the liquid inlet one-way valve and the liquid outlet one-way valve and a flow channel are achieved through elastic deformation, one-way flowing of fluid is controlled, high-precision machining is not needed, use cost is low, limitation of installation angles and positions is avoided, and installation and use are more flexible.

Description

TECHNICAL FIELD

[0001] The utility model relates to fluid conveying equipment technical field especially relates to a diaphragm pump structure. BACKGROUND

[0002] The diaphragm pump is a positive displacement infusion pump, and its basic principle is to change the volume of the pump cavity by changing the shape of the flexible diaphragm. Figure 1 The diaphragm pump of the prior art is shown in the figure, the pump head 10 is provided with a liquid inlet one-way valve 20a and a liquid outlet one-way valve 20b. When the diaphragm 30 moves towards the diaphragm driving mechanism 40, the volume of the pump cavity 11 increases, the pressure in the pump cavity 11 decreases, the liquid inlet one-way valve 20a opens, the liquid outlet one-way valve 20b closes, and the liquid is sucked in. When the diaphragm 30 moves away from the diaphragm driving mechanism 40, the volume of the pump cavity 11 decreases, the pressure in the pump cavity 11 increases, the liquid inlet one-way valve 20a closes, and the liquid outlet one-way valve 20b opens, and the liquid is discharged.

[0003] Since the liquid inlet one-way valve 20a and the liquid outlet one-way valve 20b basically adopt a ball valve type one-way valve, the main function is to rely on the self-gravity of the valve ball 21a and 21b as the reset force of the one-way valve to realize the closing action of the valve. Since the ball valve type one-way valve needs to be installed along the gravity direction, the diaphragm pump of the prior art has certain requirements for the installation angle and the installation space, it is difficult to realize miniaturization and integration design, the ball valve type one-way valve will also produce a large noise and vibration due to the movement of the valve ball, and the ball valve type one-way valve has a complex structure, high processing precision and installation and maintenance requirements, resulting in high use cost, and the diaphragm pump of the prior art has certain limitations.

[0004] Therefore, the applicant has found a method to solve the above problems through beneficial exploration and research, and the technical scheme to be introduced below is generated in this background. UTILITY MODEL CONTENTS

[0005] The technical problem to be solved by the utility model is to provide a diaphragm pump structure with simple and reliable structure, without high-precision machining, and more flexible installation and use.

[0006] The technical problem to be solved by the utility model can be realized by adopting the following technical scheme:

[0007] A diaphragm pump structure comprises:

[0008] A pump body, at least one pump cavity is formed in the pump body, and a pump body liquid inlet flow channel and a pump body liquid outlet flow channel corresponding to each pump cavity are arranged in the pump body, and each pump body liquid inlet flow channel and each pump body liquid outlet flow channel are communicated with the corresponding pump cavity, respectively.

[0009] A one-way valve body is installed on one side of the pump body. The one-way valve body has an inlet and an outlet. The inlet is connected to the corresponding pump body inlet channel through a valve body inlet channel formed inside the one-way valve body. The outlet is connected to the corresponding pump body outlet channel through a valve body outlet channel formed inside the one-way valve body.

[0010] An inlet check valve installed between the pump body and the one-way valve body and located between the pump body inlet channel and the valve body inlet channel;

[0011] A discharge check valve installed between the pump body and the one-way valve body and located between the liquid outlet channel of the pump body and the liquid outlet channel of the valve body;

[0012] A diaphragm installed in each pump chamber of the pump body; and

[0013] A diaphragm drive mechanism for driving each diaphragm to reciprocate is disposed on the other side of the pump body; characterized in that,

[0014] The inlet check valve and / or outlet check valve are diaphragm type check valves.

[0015] In a preferred embodiment of this utility model, the diaphragm-type check valve includes:

[0016] An annular fixing body is press-fitted between the pump body and the one-way valve body and is located between the pump body inlet channel and the valve body inlet channel or between the pump body outlet channel and the valve body outlet channel;

[0017] A disc-shaped sealing body, wherein the disc-shaped sealing body is located between the pump body inlet channel and the valve body inlet channel, or between the pump body outlet channel and the valve body outlet channel; and

[0018] Several rod-shaped connectors are circumferentially spaced between the annular fixing body and the disc-shaped sealing body. One end of each rod-shaped connector is connected to the annular fixing body, and the other end is connected to the disc-shaped sealing body.

[0019] In a preferred embodiment of this utility model, the annular fixing body and the disc-shaped sealing body are not on the same plane.

[0020] In a preferred embodiment of the present invention, an annular reinforcing protrusion is provided on the outer ring surface of the annular fixing body, and an annular sealing protrusion is provided on the sealing side of the disc-shaped sealing body.

[0021] In a preferred embodiment of this utility model, the annular fixing body, the disc-shaped sealing body, and the several rod-shaped connecting bodies in the diaphragm-type one-way valve are all made of elastic material.

[0022] In a preferred embodiment of the present invention, the pump body includes a main pump body and a pump cover, the one-way valve body is installed on one side of the main pump body, the pump cover is installed on the other side of the main pump body, and the pump chamber is formed between the main pump body and the pump cover.

[0023] In a preferred embodiment of this utility model, the diaphragm driving mechanism includes:

[0024] A mounting base fixedly installed on the other side of the pump body;

[0025] A connecting rod corresponding to the pump chamber is slidably disposed within the base and can reciprocate along the base. One end of the connecting rod passes through the pump body and is connected to the corresponding diaphragm.

[0026] A return spring corresponding to the connecting rod is coaxially sleeved on the connecting rod, with one end abutting against the side of the pump body and the other end abutting against the connecting rod; and

[0027] A cam drive assembly corresponding to the connecting rod is connected to the other end of the connecting rod.

[0028] In a preferred embodiment of this invention, the diaphragm is made of an elastic material.

[0029] In a preferred embodiment of the present invention, the surface of the diaphragm in contact with the pump cavity is coated with a polytetrafluoroethylene membrane.

[0030] Due to the adoption of the above technical solution, the beneficial effects of this utility model are as follows: The inlet check valve and outlet check valve of this utility model adopt diaphragm check valves. The diaphragm check valve is made of elastic material and relies on elastic deformation to achieve the fit and separation between the valve and the flow channel, controlling the unidirectional flow of fluid. It does not require high-precision processing, has low operating costs, and is not limited by installation angle and position. It is more flexible in installation and use and can be flexibly installed according to actual needs. The valve opening and closing action is relatively smooth and will not generate much noise and vibration. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of a diaphragm pump in the prior art.

[0033] Figure 2 This is a three-dimensional structural diagram of the diaphragm pump structure of this utility model.

[0034] Figure 3 This is a cross-sectional view of the diaphragm pump structure of this utility model.

[0035] Figure 4 yes Figure 3 A magnified view of part A.

[0036] Figure 5 This is a three-dimensional structural schematic diagram of Embodiment 1 of the diaphragm-type check valve of this utility model.

[0037] Figure 6 This is a cross-sectional view of Embodiment 1 of the diaphragm-type check valve of this utility model.

[0038] Figure 7 This is a three-dimensional structural schematic diagram of Embodiment 2 of the diaphragm-type check valve of this utility model.

[0039] Figure 8 This is a cross-sectional view of Embodiment 2 of the diaphragm-type check valve of this utility model. Detailed Implementation

[0040] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below with reference to specific illustrations.

[0041] See Figure 2 and Figure 3 The figure shows a diaphragm pump structure, including a pump body 100, a one-way valve body 200, an inlet one-way valve 300a, an outlet one-way valve 300b, a diaphragm 400, and a diaphragm drive mechanism 500.

[0042] The pump body 100 has two pump chambers 101. Each pump chamber 100 has a pump inlet channel 102 and a pump outlet channel 103, each communicating with its corresponding pump chamber 101. For ease of installation and disassembly, the pump body 100 includes a main pump body 110 and a pump cover 120. A one-way valve body 200 is mounted on one side of the main pump body 110, and the pump cover 120 is mounted on the other side of the main pump body 110. The pump chambers 101 are located between the main pump body 110 and the pump cover 120. The pump inlet channel 102 and the pump outlet channel 103 are located within the main pump body 110.

[0043] A one-way valve body 200 is installed on one side of the pump body 100. The one-way valve body 200 has an inlet 201 and an outlet 202. The inlet 201 is connected to the corresponding pump body inlet channel 102 through the valve body inlet channel 203 formed inside the one-way valve body 200. The outlet 202 is connected to the corresponding pump body outlet channel 103 through the valve body outlet channel 204 formed inside the one-way valve body 200.

[0044] The inlet check valve 300a is installed between the pump body 100 and the check valve body 200, and is located between the pump body inlet channel 102 and the valve body inlet channel 203. The outlet check valve 300b is installed between the pump body 100 and the check valve body 200, and is located between the pump body outlet channel 103 and the valve body outlet channel 204.

[0045] See Figure 4 The inlet check valve 300a and the outlet check valve 300b are diaphragm-type check valves. See also Figure 5 and Figure 6 The figure shows a schematic diagram of an embodiment of a diaphragm-type check valve, which includes an annular fixing body 310, a disc-shaped sealing body 320, and a plurality of rod-shaped connecting bodies 330. The annular fixing body 310 is press-fitted between the pump body 100 and the check valve body 200 and is located between the pump body inlet channel 102 and the valve body inlet channel 203, or between the pump body outlet channel 103 and the valve body outlet channel 204. The disc-shaped sealing body 320 is located between the pump body inlet channel 102 and the valve body inlet channel 203, or between the pump body outlet channel 103 and the valve body outlet channel 204. A plurality of rod-shaped connecting bodies 330 are circumferentially spaced between the annular fixing body 310 and the disc-shaped sealing body 320, with one end of each rod-shaped connecting body 330 connected to the annular fixing body 310 and the other end connected to the disc-shaped sealing body 320. The annular fixing body 310 and the disc-shaped sealing body 320 are not on the same plane, that is, there is a certain height difference between the two. The unidirectional flow of fluid is controlled by the fit and separation between the disc-shaped sealing body 320 and the flow channel.

[0046] The annular fixing body 310, the disc-shaped sealing body 320, and several rod-shaped connecting bodies 330 are all made of elastic materials. They do not require high-precision machining and rely on elastic deformation to achieve sealing. They are not limited by the installation angle and position, and can be flexibly installed according to actual needs. The valve opening and closing actions are relatively smooth and will not generate much noise or vibration.

[0047] See Figure 7 and Figure 8The figure shows a schematic diagram of another embodiment of the diaphragm check valve. The diaphragm check valve in this embodiment is roughly the same as the diaphragm check valve in the above embodiment. The difference is that: an annular reinforcing protrusion 311' is provided on the outer ring surface of the annular fixing body 310', and an annular sealing boss 321' is provided on the sealing side of the disc-shaped sealing body 320', which improves the sealing performance of the diaphragm check valve.

[0048] A diaphragm 400 is installed in each pump chamber 101 of the pump body 100, and the diaphragm 400 is made of an elastic material. In addition, the surface of the diaphragm 400 that contacts the pump chamber 101 is coated with a polytetrafluoroethylene film to improve corrosion resistance and adapt to the conveying of highly corrosive liquids.

[0049] A diaphragm drive mechanism 500 is located on the other side of the pump body 100 and is used to drive each diaphragm 400 to reciprocate. Specifically, the diaphragm drive mechanism 500 includes a base 510, two connecting rods 520, two return springs 530, and two cam drive assemblies 540.

[0050] The base 510 is fixedly mounted on the other side of the pump body 100. Two connecting rods 520 correspond to two pump chambers 101 in the pump body 100. Each connecting rod 520 is slidably disposed within the base 510 and can reciprocate along the base 510. One end of each connecting rod passes through the pump body 100 and is connected to the corresponding diaphragm 400. Two return springs 530 correspond to the two connecting rods 520. Each return spring 530 is coaxially sleeved on the corresponding connecting rod 520. One end of each return spring abuts against the side of the pump body 100, and the other end abuts against the connecting rod 520. Two cam drive assemblies 540 correspond to the two connecting rods 520. Each cam drive assembly 540 is connected to the other end of the corresponding connecting rod 520.

[0051] The diaphragm pump structure of this utility model uses a cam drive assembly 540 as a power source to drive the connecting rod 520 to reciprocate linearly within the base 510. The connecting rod 520 drives the diaphragm 400 to move. When the diaphragm 400 moves in the direction of the connecting rod 520, the volume of the pump chamber 101 increases, the pressure inside the pump chamber 101 decreases, the inlet check valve 300a opens, and the outlet check valve 300b closes, allowing liquid to be drawn in. When the diaphragm 400 moves in the opposite direction, the volume of the pump chamber 101 decreases, the pressure inside the pump chamber 101 increases, the inlet check valve 300a closes, and the outlet check valve 300b opens, allowing liquid to be discharged.

[0052] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A diaphragm pump structure, comprising: a pump body, at least one pump cavity being formed in the pump body, a pump body inlet flow channel and a pump body outlet flow channel corresponding to each pump cavity being arranged in the pump body, each pump body inlet flow channel and each pump body outlet flow channel being communicated with the corresponding pump cavity; a one-way valve body mounted on one side of the pump body, an inlet port and an outlet port being formed on the one-way valve body, the inlet port being communicated with the corresponding pump body inlet flow channel through a valve body inlet flow channel formed in the one-way valve body, the outlet port being communicated with the corresponding pump body outlet flow channel through a valve body outlet flow channel formed in the one-way valve body; an inlet one-way valve mounted between the pump body and the one-way valve body and located between the pump body inlet flow channel and the valve body inlet flow channel; an outlet one-way valve mounted between the pump body and the one-way valve body and located between the pump body outlet flow channel and the valve body outlet flow channel; a diaphragm mounted in each pump cavity of the pump body; and a diaphragm driving mechanism arranged on the other side of the pump body for driving each diaphragm to reciprocate, characterized in that: the inlet one-way valve and / or the outlet one-way valve is a diaphragm type one-way valve; the diaphragm type one-way valve comprises: a ring-shaped fixing body, the ring-shaped fixing body being press-fitted between the pump body and the one-way valve body and located between the pump body inlet flow channel and the valve body inlet flow channel or between the pump body outlet flow channel and the valve body outlet flow channel; a circular pie-shaped sealing body, the circular pie-shaped sealing body being located between the pump body inlet flow channel and the valve body inlet flow channel or between the pump body outlet flow channel and the valve body outlet flow channel; and a plurality of rod-shaped connecting bodies being arranged in a circumferential direction between the ring-shaped fixing body and the circular pie-shaped sealing body, one end of each rod-shaped connecting body being connected with the ring-shaped fixing body and the other end being connected with the circular pie-shaped sealing body.

2. The diaphragm pump structure of claim 1, wherein The ring-shaped fixing body and the circular pie-shaped sealing body are not in the same plane.

3. The diaphragm pump structure of claim 1, wherein An annular reinforcing protrusion is arranged on the outer ring surface of the ring-shaped fixing body, and an annular sealing boss is arranged on the blocking side surface of the circular pie-shaped sealing body.

4. The diaphragm pump structure of claim 1, wherein The ring-shaped fixing body, the circular pie-shaped sealing body and the plurality of rod-shaped connecting bodies in the diaphragm type one-way valve are all made of elastic material.

5. The diaphragm pump structure of claim 1, wherein The pump body comprises a main pump body and a pump cover, the one-way valve body is mounted on one side surface of the main pump body, the pump cover is mounted on the other side surface of the main pump body, and the pump cavity is formed between the main pump body and the pump cover.

6. The diaphragm pump structure of claim 1, wherein The diaphragm is made of elastic material.

7. The diaphragm pump structure of claim 1, wherein A polytetrafluoroethylene film is coated on the surface of the diaphragm in contact with the pump cavity.

8. The membrane pump structure of any one of claims 1 to 7, wherein, The diaphragm driving mechanism comprises: a machine base fixedly mounted on the other side of the pump body; a connecting rod corresponding to the pump cavity, the connecting rod being slidingly arranged in the machine base and being capable of reciprocating along the machine base, one end of the connecting rod penetrating through the pump body and being connected with the corresponding diaphragm; a return spring corresponding to the connecting rod, the return spring being coaxially sleeved on the connecting rod, one end of the return spring abutting against the side surface of the pump body and the other end abutting against the connecting rod; and a cam driving assembly corresponding to the connecting rod, the cam driving assembly being connected with the other end of the connecting rod.

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