A leak-proof micro pump structure

Abstract

The utility model discloses a leakproof micro pump structure, aiming to solve the problem that the existing pump body is easy to leak. The utility model comprises a pump body and a connecting block, the pump body comprises a pump liquid cavity, a transverse membrane arranged in the pump liquid cavity controlled by an electromagnetic valve and two liquid channels connected to the pump liquid cavity, a connecting through hole connected to the liquid channel is provided on the connecting block, the connecting through hole is used to connect a connecting pipe, the other end of the connecting pipe is connected to a liquid inlet container or a liquid outlet container, a sealing gasket is provided between the connecting block and the pump body, a recess adapted to the sealing gasket is provided on the connecting block, a sealing groove surrounding the outer sides of the two connecting through holes is provided on the recess, an outer ring protrusion and an inner ring protrusion are provided on the sealing gasket, a liquid through hole is provided in the middle of the inner ring protrusion, the outer ring protrusion is inserted into the sealing groove, and the inner ring protrusion is inserted into the connecting through hole.

Description

Technical Field

[0001] The utility model relates to the field of pump bodies, and more specifically, to a leak-proof micro pump structure. Background Art

[0002] The self-priming micro pump is a type of diaphragm pump. It relies on the reciprocating motion of a diaphragm to change the volume of the studio to inhale and discharge liquid. The forward and backward movement between the diaphragms changes the volume of the diaphragm and the pump chamber, causing the diaphragm to move up and down to form a vacuum adsorption and pushing phenomenon to achieve the purpose of liquid transportation. The self-priming micro pump uses a specially designed and processed flexible diaphragm to replace the traditional piston. The electromagnetic drive and the coil are energized to generate magnetic force, which adsorbs the armature on the coil, and the diaphragm moves upward and in the direction of the armature; the coil is powered off and no magnetic force is generated, the armature returns to its original position, and the diaphragm moves downward and returns to the initial position. Under the action of the drive mechanism, the diaphragm reciprocates, thereby completing the process from suction to discharge, and realizing high-precision distribution volume control and liquid flow path movement. It is widely used in various medium and low pressure systems, and is widely used in environmental analysis instruments, laboratory analysis instruments, biological and diagnostic analysis instruments.

[0003] The existing micro pumps are prone to leaking at the connection positions of the parts during operation, and when the pipeline is replaced, the liquid at the joint is prone to leak from the joint.

[0004] The present application aims to provide a leak-proof micro pump structure that can avoid the above-mentioned defects, improve the sealing of the pump body, and enhance the safety and sealing of the pump. Summary of the invention

[0005] The utility model overcomes the drawback of the existing micro pump that it is easy to leak liquid, and provides a leak-proof micro pump structure, which has better sealing performance, can improve the sealing performance of the pump body, and improve the safety of the pump.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A leakproof micro pump structure, the micro pump comprises a pump body and a connecting block, the pump body comprises a pump liquid cavity, a transverse membrane arranged in the pump liquid cavity and controlled by an electromagnetic valve, and two liquid channels connected to the pump liquid cavity, a connecting through hole connected to the liquid channel is provided on the connecting block, the connecting through hole is used to connect a connecting pipe, the other end of the connecting pipe is connected to a liquid inlet container or a liquid outlet container, a sealing gasket is provided between the connecting block and the pump body, a recess adapted to the sealing gasket is provided on the connecting block, a sealing groove surrounding the outer sides of the two connecting through holes is provided on the recess, an outer ring protrusion and an inner ring protrusion are provided on the sealing gasket, a liquid through hole is provided in the middle of the inner ring protrusion, the outer ring protrusion is inserted into the sealing groove, and the inner ring protrusion is inserted into the connecting through hole.

[0008] The main leakage gap appears between the pump body and the connecting block. Since the connecting block also needs to be connected to the external connecting pipe, after being subjected to the pulling force of the connecting pipe, it is deformed and a gap appears between it and the pump body, resulting in leakage.

[0009] The present application provides a sealing gasket, which is arranged between the pump body and the connecting block, and can eliminate the gap caused by external force, thereby avoiding the appearance of gaps.

[0010] In addition to the inner ring protrusion arranged in the connecting through hole, the sealing gasket also has outer ring protrusions outside the two connecting through holes. Through the double-layer sealing structure, it can effectively achieve sealing and avoid leakage.

[0011] Preferably, the sealing gasket is provided with a plurality of back-facing protrusions on one side away from the outer ring protrusion and the inner ring protrusion, and the pump body is provided with back-facing grooves, into which the back-facing protrusions are inserted. The structure prevents liquid from flowing out from between the sealing gasket and the pump body.

[0012] Preferably, the sealing gasket is made of fluororubber, which is low-cost, easy to obtain, has a long service life, and has excellent chemical resistance. It has similar working conditions to other materials of the product and is suitable for the original working conditions of the product.

[0013] Preferably, the diameter of the liquid through hole is larger than the diameter of the thinnest part of the liquid channel. The structure can prevent the deformation caused by tightening and compressing the joint and will not affect the flow rate.

[0014] Preferably, a gap is provided between the inner ring protrusion and the wall of the connecting through hole, and the gap is used for inserting the wall of the connecting pipe. The structure is used to further position the sealing gasket, maintain the reliability of the seal, and reduce the probability of liquid leakage when the connecting pipe is installed.

[0015] Preferably, the gap is wider at the bottom and narrower at the top. The structure plays a guiding role.

[0016] Preferably, a plurality of mesh capillary scratches are provided on the groove wall of the sealing groove, and the capillary scratches are used to guide the glue coated on the outer ring protrusion to form a liquid crawling net, and the liquid crawling net prolongs the time for the liquid to pass through the back groove and the sealing groove. The liquid crawling net formed by the knot structure can prolong the liquid crawling path of the leaked liquid and reduce the probability of leakage.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] By setting up the sealing gasket, it has good sealing performance, can adapt to the deformation between the pump body and the connecting block, eliminate the gap caused by external force, and achieve sealing through the cooperation of the protrusion and the groove, so as to reduce the probability of leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the utility model;

[0020] Figure 2 yes Figure 1 Cross-section at AA in the middle;

[0021] Figure 3 In other embodiments Figure 1 Sectional view at AA in the middle;

[0022] Figure 4 It is an axonometric view of the sealing gasket;

[0023] In the figure:

[0024] Pump body 1, connecting block 2, pump liquid chamber 3, transverse membrane 4, liquid channel 5, connecting through hole 6, sealing gasket 7, recess 8, sealing groove 9, outer ring protrusion 10, inner ring protrusion 11, liquid through hole 12, back protrusion 13, back groove 14. DETAILED DESCRIPTION

[0025] The present disclosure is further described below in conjunction with the accompanying drawings and embodiments.

[0026] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0027] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0028] In the present disclosure, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present disclosure, and do not specifically refer to any part or element in the present disclosure and should not be understood as limitations on the present disclosure.

[0029] In the present disclosure, terms such as "fixed connection", "connected", "connection", etc. should be understood in a broad sense, indicating that it can be fixedly connected, integrally connected or detachably connected; it can be directly connected or indirectly connected through an intermediate medium. For relevant scientific research or technical personnel in this field, the specific meanings of the above terms in the present disclosure can be determined according to specific circumstances, and they cannot be understood as limitations on the present disclosure.

[0030] Example:

[0031] A leakproof micro pump structure, reference Figures 1 to 3 As shown, the micro pump comprises a pump body 1 and a connecting block 2 .

[0032] The pump body 1 comprises a pump liquid chamber 3 , a diaphragm 4 arranged in the pump liquid chamber 3 and controlled by a solenoid valve, and two liquid channels 5 connected to the pump liquid chamber 3 .

[0033] The pump body 1 comprises an upper pump body 1 and a lower pump body 1 , and the aforementioned pump liquid chamber 3 , diaphragm 4 and liquid channel 5 are opened or installed in the upper pump body 1 or the lower pump body 1 .

[0034] The principle of the pump body 1 to realize the micro pump is:

[0035] The electrical conduction of the electromagnetic valve generates a magnetic field, which pulls up the armature, thereby pulling up the diaphragm 4, increasing the size of the space between the diaphragm 4 and the pump fluid chamber 3, so that the air pressure in the space is reduced.

[0036] One-way valves in opposite directions are installed on the two liquid channels 5, and one liquid channel 5 sucks the liquid medicine from the corresponding liquid inlet container.

[0037] After the electromagnetic valve loses power, the space between the diaphragm 4 and the pump liquid chamber 3 decreases, and the air pressure increases, so the liquid medicine is pumped out from another liquid channel 5, realizing the micro pump function.

[0038] The function of the connection block 2 is to connect with the liquid channel 5 and provide a connection function with the connection pipe. The connection block 2 is provided with a connection through hole 6 connected to the liquid channel 5, and the connection through hole 6 is used to connect the connection pipe. The other end of the connection pipe is connected to the liquid inlet container or the liquid outlet container. The connection pipe is connected to the connection block 2 by a threaded connection.

[0039] The reason why the connection block 2 is not set as an integral structure with the connection part of the pump body 1 is that the material of the part of the pump body 1 forming the liquid channel 5 is PTFE, which is resistant to strong acid and alkali corrosion. The connection block 2 below is made of cheap plastic that is not corrosion-resistant, which can save costs. The connection form of the connecting pipe is threaded connection. The PTFE material is relatively soft and cannot realize the function of threaded connection, which easily leads to loss of sealing performance, causing leakage and failure of pumping.

[0040] Ginseng Figure 2 , 4As shown, a sealing gasket 7 is provided between the connection block 2 and the pump body 1, a recess 8 adapted to the sealing gasket 7 is provided on the connection block 2, a sealing groove 9 surrounding the outer sides of the two connecting through holes 6 is provided on the recess 8, an outer ring protrusion 10 and an inner ring protrusion 11 are provided on the sealing gasket 7, a liquid through hole 12 is provided in the middle of the inner ring protrusion 11, the outer ring protrusion 10 is inserted into the sealing groove 9, and the inner ring protrusion 11 is inserted into the connecting through hole 6. The diameter of the liquid through hole 12 is larger than the diameter of the thinnest part of the liquid channel 5. The structure can prevent the deformation caused by tightening and compressing the joint from affecting the flow rate.

[0041] Ginseng Figure 3 As shown, the sealing gasket 7 is provided with a plurality of back protrusions 13 on one side away from the outer ring protrusion 10 and the inner ring protrusion 11, and the pump body 1 is provided with back grooves 14, and the back protrusions 13 are inserted into the back grooves 14. The structure prevents liquid from flowing out from between the sealing gasket 7 and the pump body 1.

[0042] A gap is provided between the inner ring protrusion 11 and the hole wall of the connecting through hole 6, and the gap is used for inserting the wall of the connecting pipe. The structure is used to further position the sealing gasket 7, maintain the reliability of the seal, and reduce the probability of liquid leakage when the connecting pipe is installed. The gap is wide at the bottom and narrow at the top. The structure plays a guiding role.

[0043] The sealing gasket 7 is made of fluororubber, which is low-cost, easy to obtain, has a long service life, and has excellent chemical resistance. It has similar working conditions to other materials of the product and is suitable for the original working conditions of the product.

[0044] The groove wall of the sealing groove 9 is provided with a plurality of mesh capillary scratches, which are used to guide the glue coated on the outer ring protrusion 10 to form a liquid crawling net, which prolongs the time for the liquid to pass through the back groove 14 and the sealing groove 9. The liquid crawling net formed by the knot structure can prolong the liquid crawling path of the leaked liquid and reduce the probability of liquid leakage. The use is as follows: before installing the sealing gasket 7, a circle of glue is brushed on the side wall of the sealing groove 9, and then the sealing gasket 7 is installed, and the liquid crawling net will be formed between the sealing gasket 7 and the side wall of the sealing groove 9.

[0045] The main leakage gap appears between the pump body 1 and the connecting block 2. Since the connecting block 2 also needs to be connected to an external connecting pipe, it deforms after being subjected to the pulling force of the connecting pipe and a gap appears between it and the pump body 1, causing leakage.

[0046] The present application provides a sealing gasket 7, which is arranged between the pump body 1 and the connecting block 2, and can eliminate the gap caused by external force, thereby avoiding the appearance of a gap.

[0047] In addition to the inner ring protrusion 11 provided in the connecting through hole 6, the sealing gasket 7 also has outer ring protrusions 10 on the outer sides of the two connecting through holes 6. Through the double-layer sealing structure, it can effectively achieve sealing and avoid leakage.

[0048] The above-described embodiments are only preferred solutions of the present invention and are not intended to limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A leakproof micro pump structure, characterized in that: The micro pump includes a pump body and a connecting block. The pump body includes a pump liquid cavity, a transverse membrane arranged in the pump liquid cavity and controlled by an electromagnetic valve, and two liquid channels connected to the pump liquid cavity. The connecting block is provided with a connecting through hole connected to the liquid channel. The connecting through hole is used to connect a connecting pipe. The other end of the connecting pipe is connected to a liquid inlet container or a liquid outlet container. A sealing gasket is provided between the connecting block and the pump body. The connecting block is provided with a recess to accommodate the sealing gasket. The recess is provided with a sealing groove surrounding the outer sides of the two connecting through holes. The sealing gasket is provided with an outer ring protrusion and an inner ring protrusion. A liquid through hole is provided in the middle of the inner ring protrusion. The outer ring protrusion is inserted into the sealing groove, and the inner ring protrusion is inserted into the connecting through hole.

2. A leakproof micro pump structure according to claim 1, characterized in that: A plurality of back-facing protrusions are arranged on one side of the sealing gasket away from the outer ring protrusion and the inner ring protrusion, and a back-facing groove is arranged on the pump body, and the back-facing protrusion is inserted into the back-facing groove.

3. A leakproof micro pump structure according to claim 1, characterized in that: The material of the sealing gasket is fluororubber.

4. A leakproof micro pump structure according to claim 1, characterized in that: The diameter of the liquid through hole is larger than the diameter of the thinnest part of the liquid channel.

5. A leakproof micro pump structure according to claim 1, characterized in that: A gap is provided between the inner ring protrusion and the hole wall of the connecting through hole, and the gap is used for the pipe wall of the connecting pipe to be inserted.

6. A leakproof micro pump structure according to claim 5, characterized in that: The gap is wider at the bottom and narrower at the top.

7. A leakproof micro pump structure according to any one of claims 1 to 6, characterized in that: A plurality of mesh-like capillary scratches are arranged on the groove wall of the sealing groove, and the capillary scratches are used to guide the glue coated on the outer ring protrusion to form a liquid crawling net, which prolongs the time for the liquid to pass through the back groove and the sealing groove.

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