CN219281923U

CN219281923U - Self-priming micro pump with stable single dispensing quantity

Info

Publication number: CN219281923U
Application number: CN202223422626.0U
Authority: CN
Inventors: 崔玉峰
Original assignee: Shanghai Beion Pharmaceutical Technology Co ltd
Current assignee: Shanghai Beion Pharmaceutical Technology Co ltd
Priority date: 2022-12-20
Filing date: 2022-12-20
Publication date: 2023-06-30
Anticipated expiration: 2032-12-20

Abstract

The utility model discloses a self-priming micro pump with stable single dispensing quantity, which comprises a shell, wherein a valve core is arranged in the shell; an armature is arranged below the valve core, a through hole is arranged in the middle of the valve core and the armature, a push rod is arranged in the through hole in a penetrating way, and a pull rod is arranged below the push rod; one end of the push rod penetrates through the armature, the other end of the push rod penetrates through the guide seat, and a diaphragm is arranged at the end part of the pull rod, which is arranged in the guide seat; the guide seat is fixed in the upper pump body through a threaded compression ring, and a diaphragm is arranged between the pull rod and the upper pump body; the needle roller sequentially penetrates through the upper pump body, the lower pump body and the lower supporting plate to form the pump body, two channels are arranged in the pump body, one channel is communicated to the middle part of the guide seat, namely the corresponding position of the diaphragm, and the other channel is communicated to a cavity between the diaphragm and the side wall of the guide seat. The utility model can reduce the adverse effect of large variation of pumping capacity error, improve the stability of pumping capacity measurement each time and ensure reliable collected data.

Description

Self-priming micro pump with stable single dispensing quantity

Technical Field

The utility model relates to a self-priming micro pump with stable single dispensing quantity.

Background

The self-priming micro pump is one of diaphragm pumps, and is characterized by that it utilizes the reciprocating motion of a diaphragm to change working chamber volume so as to suck and discharge liquid, and utilizes the back-and-forth action between diaphragms to make the diaphragm and pump cavity volume change, so that the diaphragm can be moved up and down to form vacuum adsorption and pushing phenomenon so as to attain the goal of conveying liquid. The self-priming micro pump replaces the traditional piston with a flexible diaphragm which is specially designed and processed, generates magnetic force through electromagnetic driving and coil electrifying, and adsorbs an armature on the coil, and the diaphragm moves upwards and the armature moves upwards; the coil is powered off to generate no magnetic force, the armature is restored to the original position, and the diaphragm moves downwards and returns to the initial position. The reciprocating motion of the diaphragm is realized under the action of the driving mechanism, so that the suction-to-discharge process is completed, and the control of high-precision dispensing amount and the movement of the liquid flow path are realized. The method is widely applied to various medium-low pressure systems, and has more application in environmental protection analytical instruments, laboratory analytical instruments, biological and diagnostic analytical instruments.

Disclosure of Invention

The utility model aims to solve the technical problems that: the self-priming micro pump needle solves the problem that a single dispensing amount in the prior art does not meet the dispensing amount set by a factory, and has stable dispensing amount.

In order to solve the technical problems, the utility model provides the following technical scheme:

the self-priming micro pump with stable single dispensing quantity comprises a shell, wherein a valve core is arranged in the shell, a coil is sleeved on the outer side of the valve core, a connecting wire at one end of the coil is exposed out of the shell, and a clamping ring for limiting the coil is arranged below the coil; an armature is arranged below the valve core, a through hole is formed in the middle of the valve core and the armature, a push rod is arranged in the through hole in a penetrating manner, a pull rod is arranged below the push rod, a set screw is arranged at the top of the through hole, and a spring is arranged between the set screw and the push rod; one end of the push rod penetrates through the armature, the other end of the push rod penetrates through the guide seat, and a diaphragm is arranged at the end part of the pull rod, which is arranged in the guide seat; the guide seat is fixed in the upper pump body through a threaded compression ring, and a diaphragm is arranged between the pull rod and the upper pump body; the needle rollers sequentially penetrate through the upper pump body, the lower pump body and the lower supporting plate to form the pump body, two channels are arranged in the pump body, two check valves with opposite directions are respectively arranged in the two channels, one channel is communicated to the middle part of the guide seat, namely the corresponding position of the diaphragm, and the other channel is communicated to a cavity between the diaphragm and the side wall of the guide seat; the upper pump body is connected with the shell through an upper supporting plate.

Preferably, a wire protecting sleeve for protecting the connecting wires is arranged on the shell.

Preferably, a conical bulge is arranged on one side of the armature, and a groove matched with the conical bulge is arranged on one side of the valve core.

Preferably, the diaphragm is fixed between the fastening ring and the upper pump body by a diaphragm snap ring.

Preferably, the upper support plate, the upper pump body, the lower pump body and the lower support plate are fixedly connected through screws in sequence.

Preferably, the upper support plate is screwed with the housing.

Preferably, the channel communicated with the diaphragm is a liquid inlet channel, and the other channel is a liquid outlet channel.

Compared with the prior art, the utility model has the following beneficial effects:

1. through the adjustment to last structure of the pump body and to the further optimization to the crater structure size, effectively avoided the unstable problem of single dispensing volume, and reduce the size of crater to increase the stroke when the diaphragm acts, make the single dispensing volume error of inhaling formula micro pump less through this kind of mode, guarantee stability.

2. The diaphragm components are connected together through the form of the barbs, and the problems that the diaphragm and the pull rod fall off due to the fact that glue is adhered are avoided due to the cooperation of the barb structures, and the problem that connection failure falls off due to the barb structures is avoided.

Drawings

FIG. 1 is a schematic diagram of a self-priming micropump according to the present utility model;

FIG. 2 is an enlarged view of a portion of the pump body;

fig. 3 is a perspective view of a self-priming micro pump provided by the present utility model.

Detailed Description

For the sake of clarity and understanding, the preferred embodiments are described in detail below with reference to the accompanying drawings.

Examples

As shown in fig. 1-3, the self-priming micro pump with stable single dispensing amount provided by the utility model comprises a shell 21, wherein a valve core 22 is arranged in the shell 21, a coil 4 is sleeved outside the valve core 22, a connecting wire 23 at one end of the coil 4 is exposed from the shell 21, and a clamping ring 6 for limiting the coil 4 is arranged below the coil 4; an armature 7 is arranged below the valve core 22, through holes are formed in the middle parts of the valve core 22 and the armature 7, a push rod 5 is arranged in the through holes in a penetrating mode, a pull rod 8 is arranged below the push rod 5, a set screw 1 is arranged at the top of the through holes, and a spring 3 is arranged between the set screw 1 and the push rod 5; one end of the push rod 5 is penetrated into the armature 7, the other end is penetrated into the guide seat 10, and the end part of the pull rod 8 in the guide seat 10 is sleeved with a fastening ring 11; the guide seat 10 is fixed in the upper pump body 17 through a threaded compression ring 9, and a diaphragm 20 is arranged between the pull rod 8 and the upper pump body 17; the needle roller 15 sequentially penetrates through the upper pump body 17, the lower pump body 16 and the lower support plate 14 to form a pump body, two channels are arranged in the pump body, two check valves 13 with opposite directions are respectively arranged in the two channels, one channel is communicated to the middle part of the guide seat 10, namely the corresponding position of the diaphragm 20, and the other channel is communicated to a cavity between the diaphragm 20 and the side wall of the guide seat 10.

The casing 21 is provided with a wire sheath 2 for protecting the connecting wires 23.

One side of the armature 7 is provided with a conical protrusion, similar to the structure of a volcanic vent, and one side of the valve core 22 is provided with a groove matched with the conical protrusion. For the structure and the size of the position, more detail size change and design are carried out, and the measuring precision is improved by increasing the stroke.

The diaphragm 20 is fixed between the fastening ring 11 and the upper pump body 17 by a diaphragm snap ring 12.

The upper support plate 19, the upper pump body 17, the lower pump body 16 and the lower support plate 14 are fixedly connected through screws 18 in sequence.

The upper support plate 19 is screwed with the housing 21.

The channel communicated with the diaphragm 20 is a liquid inlet channel, and the other channel is a liquid outlet channel. Namely, the one-way valve 13 at the middle position faces upwards to take charge of liquid inlet, and the one-way valve 13 at the other position faces downwards to take charge of liquid outlet.

When the utility model is electrified, namely the coil 4 is electrified, the diaphragm 20 acts, the one-way valve 13 responsible for liquid inlet is opened, the one-way valve 13 for liquid outlet is closed, and liquid enters the cavity; when the coil 4 is powered off, the diaphragm 20 does not act, the one-way valve 13 responsible for liquid inlet is closed, the one-way valve 13 for liquid outlet is opened, and the liquid flows out of the cavity of the guide seat 20. In this process, the check valve 13 is designed to effectively perform the feeding and discharging operations as shown in fig. 2. The coil 4 is electrified to provide conditions for the whole process, the coil 4 is electrified to generate a magnetic field, the armature 7 is adsorbed by the magnetic field force, and then the pull rod 8 and the diaphragm 20 are driven to move; when the coil 4 is powered off and has no magnetic field, the armature 7 returns to the original position under the action of the spring 3, and then the pull rod 8 and the diaphragm 20 are pushed back to the original position; the reciprocating motion of the diaphragm 20, and the delivery of material, is achieved by repeating the power on/off actions.

Claims

1. The self-priming micro pump with stable single dispensing quantity comprises a shell (21), wherein a valve core (22) is arranged in the shell (21), and is characterized in that a coil (4) is sleeved on the outer side of the valve core (22), a connecting lead (23) at one end of the coil (4) is exposed out of the shell (21), and a clamping ring (6) for limiting the coil (4) is arranged below the coil (4); an armature (7) is arranged below the valve core (22), through holes are formed in the middle of the valve core (22) and the armature (7), a push rod (5) is arranged in the through holes in a penetrating mode, a pull rod (8) is arranged below the push rod (5), a set screw (1) is arranged at the top of the through hole, and a spring (3) is arranged between the set screw (1) and the push rod (5); one end of the push rod (5) is penetrated into the armature (7), the other end is penetrated into the guide seat (10), and a diaphragm (20) is arranged at the end part of the pull rod (8) which is arranged in the guide seat (10); the guide seat (10) is fixed in the upper pump body (17) through a thread pressing ring (9), and a diaphragm (20) is arranged between the pull rod (8) and the upper pump body (17); the needle roller (15) sequentially penetrates through the upper pump body (17), the lower pump body (16) and the lower support plate (14) to form a pump body, two channels are arranged in the pump body, two check valves (13) with opposite directions are respectively arranged in the two channels, one channel is communicated to the middle part of the guide seat (10), namely the corresponding position of the diaphragm (20), and the other channel is communicated to a cavity between the diaphragm (20) and the side wall of the guide seat (10); the upper pump body (17) is connected with the shell (21) through an upper supporting plate (19).

2. Self-priming micro pump with stable single dispensing quantity according to claim 1, characterized in that the housing (21) is provided with a wire sheath (2) for protecting the connecting wires (23).

3. Self-priming micro pump with stable single dispensing quantity according to claim 1, characterized in that one side of the armature (7) is provided with a conical protrusion and one side of the valve core (22) is provided with a groove matching the conical protrusion.

4. Self-priming micro pump with stable single dispense according to claim 1, characterized in that the diaphragm (20) is fixed between the fastening ring (11) and the upper pump body (17) by a diaphragm snap ring (12).

5. Self-priming micro pump with stable single dispensing quantity according to claim 1, characterized in that the upper support plate (19), the upper pump body (17), the lower pump body (16) and the lower support plate (14) are fixedly connected in sequence by screws (18).

6. Self-priming micro pump with stable single dispense according to claim 1, characterized in that the upper support plate (19) is screwed with the housing (21).

7. Self-priming micro pump with stable single dispensing according to any of the claims 1-6, characterized in that the channel communicating with the membrane (20) is the inlet channel and the other channel is the outlet channel.