Electromagnetic metering pump

Abstract

The utility model belongs to the field of metering pumps, and particularly relates to an electromagnetic metering pump which comprises a pump body, a pump cavity and a driving mechanism, a liquid inlet channel and a liquid outlet channel which are in one-way circulation are arranged at the two ends of the pump body respectively, and a liquid inlet valve and a liquid outlet valve which are used for limiting backflow are correspondingly arranged in the liquid inlet channel and the liquid outlet channel respectively. The liquid inlet channel and the liquid outlet channel are both communicated with the pump cavity. The driving mechanism is located in the pump body, the driving end of the driving mechanism is connected with a leather tile, the leather tile forms the lower portion of the pump cavity, the leather tile moves close to or away from the pump cavity under the action of the driving mechanism, the volume of the pump cavity is changed so that the air pressure in the pump cavity can be changed, and the liquid inlet valve and the liquid outlet valve can be correspondingly opened and closed through the air pressure change. By accurately controlling the movement of the leather tile, the accurate change of the volume of the pump cavity is realized, so that the accurate metering of liquid is ensured, and an application scene with a high-precision requirement is met.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of metering pump especially relates to an electromagnetic metering pump. BACKGROUND

[0002] In the field of liquid metering and conveying, metering pumps are widely used because they can accurately control liquid flow. The transmission metering pump is mostly driven by mechanical or pneumatic mode. These modes meet the metering requirements to some extent, but often have problems such as complex structure and limited precision. Especially when high-viscosity liquid needs to be processed or extremely high metering precision is required, the performance of the traditional pump is not satisfactory.

[0003] With the development of electromagnetic technology, electromagnetic metering pumps have gradually attracted attention because of their simple structure, rapid response and other advantages. However, the existing electromagnetic metering pumps still have deficiencies in structural design, such as the mechanism of pump cavity volume change is not flexible enough, which makes it difficult to further improve the metering precision and efficiency. In addition, some designs do not effectively utilize electromagnetic force to directly drive the pump operation, but use indirect transmission mechanisms, which increases energy loss and failure points. SUMMARY

[0004] The utility model aims at providing an electromagnetic metering pump to solve the above problems.

[0005] To achieve the above purpose, the utility model provides an electromagnetic metering pump for pumping liquid for detection, which comprises a pump body, a pump cavity and a driving mechanism. The pump body is provided with a liquid inlet channel and a liquid outlet channel at both ends, respectively, which are unidirectional flow channels. The liquid inlet valve and the liquid outlet valve are respectively arranged in the liquid inlet channel and the liquid outlet channel. The pump body is provided with a sealed pump cavity. The liquid inlet channel and the liquid outlet channel are in communication with the pump cavity. The driving mechanism is located in the pump body, and the driving end of the driving mechanism is connected to a skin tile. The skin tile constitutes the lower part of the pump cavity. Under the action of the driving mechanism, the skin tile moves closer or further away, so that the volume of the pump cavity changes to change the air pressure in the pump cavity. The change of air pressure makes the liquid inlet valve and the liquid outlet valve open and close correspondingly.

[0006] Further, the driving mechanism comprises a coil, a fixed core and an armature. The pump body is fixedly provided with a support body placed along the axial direction. The coil is wound around the outer end of the support body. The bottom end of the support body is provided with a fixed core fixedly connected thereto. The fixed core and the coil are electrically connected to generate a magnetic force. The support body is also provided with a movable cavity. The movable cavity is provided with a slidable armature. The end of the armature close to the pump body is connected to the skin tile. Under the action of the magnetic force of the fixed core, the skin tile moves closer to the fixed core in the movable cavity. The volume of the pump cavity changes to change the air pressure in the pump cavity. The change of air pressure makes the liquid inlet valve and the liquid outlet valve open and close correspondingly.

[0007] Further, the driving mechanism further comprises a reset spring, the reset spring is located in the movable cavity, one end of the reset spring is connected with the fixed core, and the other end of the reset spring is connected with the armature, so that the armature is driven to move away from the fixed core when the coil is powered off; the volume of the pump cavity is changed to change the air pressure in the pump cavity, and the air pressure change makes the inlet valve and the outlet valve correspondingly open and close.

[0008] Further, the inlet valve and the outlet valve are both formed by duckbill valves, the input end of the inlet valve faces the outside, the output end of the inlet valve faces the pump body, the input end of the outlet valve faces the pump body, and the output end of the outlet valve faces the outside.

[0009] Further, the pump body is formed by connecting an upper cover body and a lower cover body, the lower end of the upper cover body is inwardly recessed to form an upper portion and a side wall portion of the pump cavity, and the pump cavity is formed by cooperating with the skin tile.

[0010] Further, the armature is internally provided with a downwardly-opened placing cavity, one end of the reset spring is connected with the fixed core, and the other end of the reset spring passes through the placing cavity and is connected with the armature.

[0011] Further, the lower end surface of the pump body is provided with a threaded hole penetrating through, the outer side wall of the fixed core is provided with a matched thread, and the fixed core is threadedly connected with the threaded hole.

[0012] Further, a link wire harness extends into the pump body and is electrically connected with the coil.

[0013] Further, the inlet channel is provided with an inlet port close to the outer surface of the pump body, the inlet port is provided with a threaded end, and an external connecting mechanism is threadedly connected with the threaded end; the outlet channel is provided with an outlet port close to the outer surface of the pump body, and the outlet port is provided with a same threaded end, and an external connecting mechanism is threadedly connected with the threaded end.

[0014] The above one or more technical solutions in the electromagnetic metering pump provided by the embodiment of the utility model have at least the following technical effects:

[0015] In the design, the process is divided into two processes of liquid inlet and liquid outlet, 1, in the liquid inlet process, the driving mechanism drives the skin tile to move downward, the volume of the pump cavity is increased, negative pressure is formed, the inlet valve is opened, the outlet valve is closed, and the liquid is sucked into the pump cavity through the inlet channel; 2, in the liquid outlet process, the driving mechanism reversely drives the skin tile to move upward, the volume of the pump cavity is reduced, the pressure is increased, the inlet valve is closed, the outlet valve is opened, and the liquid is discharged through the outlet channel. Through accurate control of the movement of the skin tile, the accurate change of the volume of the pump cavity is realized, so that the accurate metering of the liquid is ensured, and the application scene with high-precision requirements is met. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0017] Fig. 1 The structural diagram of the electromagnetic metering pump provided by the embodiment of the present application.

[0018] Fig. 2 The sectional view of the electromagnetic metering pump provided by the embodiment of the present application.

[0019] Fig. 3 The exploded view of the electromagnetic metering pump provided by the embodiment of the present application.

[0020] Main figure mark explanation: 100, pump body; 101, upper cover body; 102, lower cover body; 110, pump cavity; 120, liquid inlet channel; 130, liquid outlet channel; 140, liquid inlet valve; 150, liquid outlet valve; 160, valve seat; 170, valve clack; 200, driving mechanism; 210, coil; 220, fixed iron core; 230, armature; 240, support body; 250, movable cavity; 260, return spring; 270, leather pad;

[0021] 300, placing cavity; 310, threaded port; 320, link harness; 330, liquid inlet; 340, liquid outlet. DETAILED DESCRIPTION

[0022] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The following describes the embodiments by referring to the accompanying drawings. Figs. 1-3 Figs. 1-3 The embodiments described below are exemplary, and are intended to explain the embodiments of the present application, and cannot be understood as a limitation of the present application.

[0023] In the description of the embodiments of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0024] ​In addition, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" are only used for descriptive purpose and cannot be understood as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined with "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" can explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more than two, unless otherwise specifically limited.

[0025] In the embodiments of the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0026] In the embodiments of the present application, the case provided is an electromagnetic metering pump for pumping liquid for detection, comprising a pump body 100, a pump cavity 110 and a driving mechanism 200, the two ends of the pump body 100 are respectively provided with a one-way liquid inlet channel 120 and a liquid outlet channel 130, and the two are respectively provided with a liquid inlet valve 140 and a liquid outlet valve 150 corresponding to the limit backflow, the pump body 100 is provided with a sealed pump cavity 110, and the liquid inlet channel 120 and the liquid outlet channel 130 are communicated with the pump cavity 110. The driving mechanism 200 is located in the pump body 100, and the driving end of the driving mechanism 200 is connected with a skin tile 270, the skin tile 270 constitutes the lower part of the pump cavity 110, and the skin tile 270 moves close to or away from under the action of the driving mechanism 200, so that the volume of the pump cavity 110 changes to change the air pressure in the pump cavity 110, and the air pressure change makes the liquid inlet valve 140 and the liquid outlet valve 150 correspondingly open and close.

[0027] Specifically, it is divided into two processes of liquid inlet and liquid outlet, 1, in the liquid inlet process, the driving mechanism 200 drives the skin tile 270 to move downward, the volume of the pump cavity 110 increases, a negative pressure is formed, the liquid inlet valve 140 is opened, the liquid outlet valve 150 is closed, and the liquid is sucked into the pump cavity 110 through the liquid inlet channel 120; 2, in the liquid outlet process, the driving mechanism 200 reversely drives the skin tile 270 to move upward, the volume of the pump cavity 110 decreases, the pressure rises, the liquid inlet valve 140 is closed, and the liquid outlet valve 150 is opened, and the liquid is discharged through the liquid outlet channel 130. By accurately controlling the movement of the skin tile 270, the accurate change of the volume of the pump cavity 110 is realized, so as to ensure the accurate metering of the liquid and meet the application scene with high precision requirement.

[0028] In another utility model embodiment, the driving mechanism 200 comprises a coil 210, a fixed iron core 220 and an armature 230, the pump body 100 is fixedly provided with a support body 240 placed along the axial direction thereof, the coil 210 is wound around the outer end of the support body 240, the bottom end of the support body 240 is provided with the fixed iron core 220 fixedly connected thereto, and the fixed iron core 220 is electrically connected with the coil 210 to generate a magnetic force. The support body 240 is further provided with a movable cavity 250, the movable cavity 250 is provided with the slidable armature 230, and the end of the armature 230 close to the pump body 100 is connected with a pia 270, which is driven by the magnetic force of the fixed iron core 220 to move close to the fixed iron core 220 in the movable cavity 250; so that the volume of the pump cavity 110 changes to change the air pressure in the pump cavity 110, and the air pressure change makes the inlet valve 140 and the outlet valve 150 correspondingly open and close. The driving mechanism 200 further comprises a return spring 260, which is located in the movable cavity 250, one end of the return spring 260 is connected with the fixed iron core 220, and the other end of the return spring 260 is connected with the armature 230, so as to drive the armature 230 to move away from the fixed iron core 220 when the coil 210 is powered off. So that the volume of the pump cavity 110 changes to change the air pressure in the pump cavity 110, and the air pressure change makes the inlet valve 140 and the outlet valve 150 correspondingly open and close. Specifically, 1, during the liquid inlet process, the coil 210 is powered on, the fixed iron core 220 and the coil 210 directly form an electromagnet structure, the fixed iron core 220 has a magnetic force, and the pia 270 connected with the armature 230 is driven to move towards the fixed iron core 220, the volume of the pump cavity 110 increases, a negative pressure is formed, the inlet valve 140 is opened, the outlet valve 150 is closed, and the liquid is sucked into the pump cavity 110 through the liquid inlet channel 120; 2, during the liquid outlet process, the coil 210 is powered off, the fixed iron core 220 loses the magnetic force, and the pia 270 connected with the armature 230 is driven to move away from the fixed iron core 220 under the influence of the return spring 260, the volume of the pump cavity 110 decreases, the pressure rises, the inlet valve 140 is closed, the outlet valve 150 is opened, and the liquid is discharged through the liquid outlet channel 130. Through the driving mechanism 200 of the electromagnet structure, the movement of the pia 270 is accurately controlled, and the accurate change of the volume of the pump cavity 110 is realized. The liquid in the pump cavity 110 is discharged, and the above reciprocating working action is realized to realize the transportation of the liquid.

[0029] In another utility model embodiment, the liquid inlet valve 140 and the liquid outlet valve 150 are both formed by duckbill valves, the input end of the liquid inlet valve 140 faces the outside world, the output end thereof faces the pump body 100, the input end of the liquid outlet valve 150 faces the pump body 100, and the output end thereof faces the outside world. Specifically, the liquid inlet valve 140 and the liquid outlet valve 150 are both duckbill valves made of high-quality rubber or elastic material. These duckbill valves are composed of two main parts: a fixed valve seat 160 and an elastically deformable valve flap 170. The valve flap 170 naturally closes when subjected to an inverse external force, tightly abutting the valve seat 160 to form a seal; when subjected to a positive external force, the valve flap 170 opens to allow liquid to pass through. 1. Liquid suction process: as the skin plate 270 moves downward, the volume of the pump cavity 110 increases, forming a negative pressure, at this time, the duckbill valve flap 170 of the liquid inlet valve 140 is automatically opened by a positive action, allowing liquid to enter the pump cavity 110 from the outside world, and the duckbill valve flap 170 of the liquid outlet valve 150 is automatically closed by an inverse action, not allowing liquid to flow out of the pump cavity 110 to the outside world. 2. Liquid discharge process: as the skin plate 270 moves upward, the volume of the pump cavity 110 decreases, forming a positive pressure, at this time, the duckbill valve flap 170 of the liquid outlet valve 150 is automatically opened by a positive action, allowing liquid to flow out of the pump cavity 110 to the outside world, and the duckbill valve flap 170 of the liquid inlet valve 140 is automatically closed by an inverse action, not allowing liquid to enter the pump cavity 110 from the outside world.

[0030] In another utility model embodiment, the pump body 100 is formed by connecting the upper cover body 101 and the lower cover body 102, the lower end of the upper cover body 101 is inwardly recessed to form the upper part and the side wall part of the pump cavity 110, and cooperates with the skin plate 270 to constitute the pump cavity 110, thereby improving the airtightness of the pump cavity 110.

[0031] In another utility model embodiment, the armature 230 is internally provided with a downwardly open placement cavity 300, one end of the return spring 260 is connected to the fixed iron core 220, and the other end thereof passes through the placement cavity 300 and is connected to the armature 230, thereby improving the accuracy of the acting force of the return spring 260.

[0032] In another utility model embodiment, the lower end surface of the pump body 100 is provided with a threaded opening 310 penetrating therethrough, the outer side wall of the fixed iron core 220 is provided with a matched thread, and the fixed iron core 220 is threadedly connected with the threaded opening 310. Specifically, the threaded connection has good stability and convenience, and the fixed iron core 220 adopts a threaded structure to facilitate disassembly and later maintenance.

[0033] In another utility model embodiment, a link wire harness 320 extends into the pump body 100 and forms an electrical connection with the coil 210.

[0034] In another utility model embodiment, the liquid inlet channel 120 is provided with a liquid inlet 330 on the outer surface close to the pump body 100, the liquid inlet 330 is provided with a threaded end, and is threadedly connected with the external connecting mechanism; the liquid outlet channel 130 is provided with a liquid outlet 340 on the outer surface close to the pump body 100, and the liquid outlet 340 is provided with the same threaded end, and is threadedly connected with the external connecting mechanism. Specifically, the threaded connection has good stability and convenience, and the fixed iron core 220 adopts a threaded structure, which is convenient for disassembly and later maintenance.

[0035] The above are only preferred embodiments of the present utility model, and are not used to limit the present utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. An electromagnetic metering pump for drawing up a liquid for detection, characterized in that, Comprising A pump body and a pump cavity, the pump body is provided with a one-way liquid inlet channel and a one-way liquid outlet channel at both ends respectively, and the liquid inlet valve and the liquid outlet valve are arranged in the liquid inlet channel and the liquid outlet channel respectively, the pump body is provided with a closed pump cavity, the liquid inlet channel and the liquid outlet channel are communicated with the pump cavity; A driving mechanism is arranged in the pump body, and the driving end of the driving mechanism is connected with a skin tile, the skin tile constitutes the lower part of the pump cavity, and the skin tile moves close to or away from the driving mechanism to change the volume of the pump cavity and change the air pressure in the pump cavity; the change of air pressure makes the liquid inlet valve and the liquid outlet valve open and close correspondingly.

2. Electromagnetic metering pump according to claim 1, characterized in that The driving mechanism comprises a coil, a fixed iron core and an armature, a support body is fixedly arranged in the pump body along the axial direction, the coil is wound around the outer end of the support body, the bottom end of the support body is provided with the fixed iron core fixedly connected thereto, and the fixed iron core is electrically connected with the coil to generate a magnetic force; the support body is also provided with a movable cavity, the movable cavity is provided with the armature which can slide, and one end of the armature close to the pump body is connected with the skin tile, and the skin tile moves close to the fixed iron core in the movable cavity under the magnetic force of the fixed iron core; So that the volume of the pump cavity changes to change the air pressure in the pump cavity, and the change of air pressure makes the liquid inlet valve and the liquid outlet valve open and close correspondingly.

3. Electromagnetic metering pump according to claim 2, characterized in that The driving mechanism further comprises a reset spring, one end of the reset spring is connected with the fixed iron core, and the other end of the reset spring is connected with the armature, so as to drive the armature to move away from the fixed iron core when the coil is powered off; So that the volume of the pump cavity changes to change the air pressure in the pump cavity, and the change of air pressure makes the liquid inlet valve and the liquid outlet valve open and close correspondingly.

4. The electromagnetic metering pump of claim 2, wherein, The liquid inlet valve and the liquid outlet valve are both formed by duckbill valves, the input end of the liquid inlet valve faces the outside, and the output end of the liquid inlet valve faces the pump body; the input end of the liquid outlet valve faces the pump body, and the output end of the liquid outlet valve faces the outside.

5. The electromagnetic metering pump of claim 1, wherein, The pump body is connected by an upper cover body and a lower cover body, the lower end of the upper cover body is recessed inward to form the upper part and the side wall part of the pump cavity, and the skin tile is matched to constitute the pump cavity.

6. The electromagnetic metering pump of claim 3, wherein, The armature is internally provided with a downwardly open placement cavity, one end of the reset spring is connected with the fixed iron core, and the other end of the reset spring passes through the placement cavity and is connected with the armature.

7. The electromagnetic metering pump of claim 2, wherein, The lower end surface of the pump body is provided with a threaded port penetrating through, and the outer side wall of the fixed iron core is provided with a matched thread, and the fixed iron core is threadedly connected with the threaded port.

8. The electromagnetic metering pump of claim 2, wherein, A link harness extends into the pump body and is electrically connected with the coil.

9. The electromagnetic metering pump of claim 5, wherein, The liquid inlet channel and the outer surface close to the pump body are provided with a liquid inlet port, and the liquid inlet port is provided with a threaded end which is threadedly connected with an external connecting mechanism; the liquid outlet channel and the outer surface close to the pump body are provided with a liquid outlet port, and the liquid outlet port is provided with a same threaded end which is threadedly connected with an external connecting mechanism.

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