Diaphragm type plunger metering pump driven by motor

Abstract

The utility model discloses a diaphragm type plunger metering pump driven by a motor, which relates to the technical field of chemical dosing devices and is characterized in that the diaphragm type plunger metering pump comprises a valve seat, a connecting seat and a pump body which are internally communicated in sequence, a diaphragm is arranged between the valve seat and the connecting seat, a spring plunger used for extending into the connecting seat is arranged in the pump body, and the spring plunger is arranged in the connecting seat. An adjusting assembly is arranged at the end, away from the connecting base, of the pump body, the spring plunger is connected with the adjusting assembly through a connecting ring, a shaft connector is rotationally connected to the pump body, and a driving wheel which is eccentrically arranged and located in the connecting ring is detachably connected to the bottom end of the shaft connector. The driving wheel abuts against the end, facing the spring plunger, of the connecting ring. Through the arrangement of the structure, when the flow of the diaphragm type metering pump is adjusted, the end, located in the pump body, of the adjusting knob cannot abut against the eccentrically-arranged driving wheel, so that contact objects generated when the driving wheel moves are reduced, and the service life of the driving wheel is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical dosing devices, and more specifically, it relates to an electric motor-driven diaphragm plunger metering pump. Background Technique

[0002] The diaphragm metering pump uses a specially designed and processed flexible diaphragm to replace the piston, and realizes reciprocating motion under the action of the driving mechanism to complete the suction and discharge processes. Due to the isolation effect of the diaphragm, the electric diaphragm pump truly realizes the isolation between the metered fluid and the driving and lubricating mechanism in terms of structure. The novel structural design and the selection of new materials have greatly improved the service life of the diaphragm. Coupled with the excellent corrosion resistance of the composite material, the diaphragm metering pump has become the main pump type in fluid metering applications.

[0003] In the prior art, the driving mechanism of the diaphragm metering pump is generally an eccentric wheel mechanism driven by an electric motor. The rotation of the eccentric wheel pushes the plunger to reciprocate in the metering pump, and the stroke of the plunger is controlled by rotating the adjustment knob. The rotation adjustment knob changes the axial position of the eccentric wheel by pushing it, thereby changing the stroke of the plunger and the deformation degree of the diaphragm to control the flow rate. However, in this way, the end of the rotation adjustment knob located inside the metering pump will directly contact the surface of the eccentric wheel. Due to the continuous rotation of the eccentric wheel, it will cause continuous friction between the two, affecting the service life of the eccentric wheel and resulting in a decrease in the accuracy of the rotation adjustment knob.

[0004] Therefore, it is necessary to provide an electric motor-driven diaphragm plunger metering pump to solve the above problems. Content of the Utility Model

[0005] The purpose of the utility model is to provide an electric motor-driven diaphragm plunger metering pump to solve the problems put forward in the above background technique.

[0006] The above technical purpose of the utility model is achieved through the following technical solutions:

[0007] An electric motor-driven diaphragm plunger metering pump includes a valve seat, a connecting seat, and a pump body that are sequentially connected internally. A diaphragm is provided between the valve seat and the connecting seat. A spring plunger is provided inside the pump body for extending into the connecting seat.

[0008] One end of the pump body away from the connecting seat is provided with an adjusting assembly. The spring plunger is connected to the adjusting assembly through a connecting ring. A shaft connector is rotatably connected to the pump body. The bottom end of the shaft connector is detachably connected to a driving wheel that is eccentrically arranged and located inside the connecting ring. The driving wheel abuts against one end of the connecting ring facing the spring plunger.

[0009] The technical solution of the present utility model is further set as follows: An eccentric shaft is fixedly connected to the bottom end of the shaft connector, and the driving wheel is detachably connected to the outer wall of the eccentric shaft and is coaxially arranged therewith.

[0010] The technical solution of the present utility model is further set as follows: The adjusting assembly includes a connecting plate, a connecting member, and an adjusting knob. The connecting plate is fixedly connected to the connecting member. The adjusting knob is rotatably connected to the outer wall of the pump body. The adjusting knob is connected to the connecting member through a connecting rod passing through the pump body, and the connecting member moves horizontally along the length direction of the connecting rod.

[0011] The technical solution of the present utility model is further set as follows: One end of the connecting rod located inside the pump body is provided with threads. One end of the connecting member away from the connecting plate is threadedly connected to the connecting rod. The connecting member is prevented from rotating along with the connecting rod through a limiting groove. The limiting groove is opened on the connecting ring, and the connecting plate is located inside the limiting groove.

[0012] The technical solution of the present utility model is further set as follows: Both the connecting plate and the limiting groove are horizontally arranged. A receiving groove for receiving the connecting member is opened on the connecting ring. The receiving groove is communicated with the limiting groove and is located at the center of the limiting groove.

[0013] Due to the adoption of the above technical solution, the technical progress achieved by the present utility model compared with the prior art is as follows:

[0014] Through the structural arrangement, when the motor is installed on the pump body, the output shaft of the motor can be connected to the shaft connector and drive it to rotate, so that the driving wheel moves accordingly. During this process, since the driving wheel is coaxially arranged with the eccentric shaft, every time the shaft connector rotates one circle, the driving wheel will push the spring plunger once through the connecting ring, enabling it to drive the diaphragm to deform by means of hydraulic pressure. And when it is necessary to adjust the stroke of the spring plunger, rotating the adjusting knob can make the connecting member move on the connecting rod, thereby pushing the connecting ring to move. At this time, the stroke that the driving wheel pushes the spring plunger once when the shaft connector rotates one circle will be shorter than that before adjustment, so as to achieve the control effect of the fluid flow rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a structural schematic diagram of the present utility model;

[0016] Figure 2 is a cross-sectional view of the present utility model;

[0017] Figure 3 is a structural schematic diagram of the connecting ring, the connecting plate, and the connecting member in the present utility model;

[0018] Figure 4 This is a schematic structural diagram of the connecting ring in the present utility model.

[0019] In the figure: 1, valve seat; 2, connecting seat; 3, pump body; 4, diaphragm; 5, spring plunger; 6, connecting ring; 7, shaft connector; 8, driving wheel; 9, eccentric shaft; 10, connecting plate; 11, connecting piece; 12, adjusting knob; 13, connecting rod; 14, limiting groove; 15, receiving groove. Specific embodiments

[0020] In order to better understand the technical means of the present utility model and implement it in accordance with the content of the specification, the following combines the drawings and embodiments to further describe the specific embodiments of the present utility model in detail. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model. Embodiment

[0021] As Figures 1 to 4 shown, the present utility model provides a motor-driven diaphragm plunger metering pump, including a valve seat 1, a connecting seat 2 and a pump body 3 that are sequentially connected inside. A diaphragm 4 is provided between the valve seat 1 and the connecting seat 2. Hydraulic oil is filled in both the connecting seat 2 and the pump body 3. A spring plunger 5 for extending into the connecting seat 2 is provided in the pump body 3. An adjusting assembly is provided at one end of the pump body 3 away from the connecting seat 2. The spring plunger 5 is connected to the adjusting assembly through a connecting ring 6. A shaft connector 7 for connecting to the motor shaft is rotatably connected to the pump body 3. The bottom end of the shaft connector 7 is detachably connected to a driving wheel 8 that is eccentrically arranged and located inside the connecting ring 6. The driving wheel 8 abuts against one end of the connecting ring 6 facing the spring plunger 5.

[0022] As Figures 1 to 4 shown, the bottom end of the shaft connector 7 is fixedly connected to an eccentric shaft 9. The driving wheel 8 is detachably connected to the outer wall of the eccentric shaft 9 and is coaxially arranged with it. Through such a structural setting, when the shaft connector 7 is connected to the motor shaft, the eccentric shaft 9 will perform a circular motion around the axis of the shaft connector 7 and drive the driving wheel 8 to move with it. As a result, every time the shaft connector 7 rotates one circle, the driving wheel 8 will push the connecting ring 6 once, thereby causing the plunger to move towards the diaphragm 4 once, and thus driving the diaphragm 4 to deform by means of hydraulic pressure to complete one work.

[0023] As Figures 1 to 4As shown in the figure, the adjusting assembly includes a connecting plate 10, a connecting member 11 and an adjusting knob 12. The adjusting knob 12 is rotatably connected to the outer wall of the pump body 3. The adjusting knob 12 is connected to the connecting member 11 through a connecting rod 13 passing through the pump body 3. One end of the connecting rod 13 located inside the pump body 3 is provided with a thread, and one end of the connecting member 11 is threadedly connected to the connecting rod 13. The connecting plate 10 is fixedly connected to the other end of the connecting member 11. The connecting member 11 is prevented from rotating with the connecting rod 13 through a limiting groove 14. The limiting groove 14 is formed on the connecting ring 6. The connecting plate 10 is located inside the limiting groove 14. Both the connecting plate 10 and the limiting groove 14 are horizontally arranged. An accommodating groove 15 for accommodating the connecting member 11 is formed on the connecting ring 6. The accommodating groove 15 communicates with the limiting groove 14 and is located at the center of the limiting groove 14.

[0024] Through such a structural arrangement, the connecting ring 6 can slide on the connecting plate 10 by using the limiting groove 14, so as to ensure that both the spring plunger 5 and the connecting ring 6 can move smoothly in this metering pump. And the spring on the spring plunger 5 can make the connecting plate 10 abut against the inner bottom surface of the limiting groove 14. Thus, when the adjusting knob 12 is rotated, the connecting plate 10 can push the connecting ring 6 to move in the limiting groove 14. And during this process, due to the limitation of the limiting groove 14 on the connecting plate 10, the connecting member 11 will not rotate with the connecting rod 13, so that the connecting member 11 can move horizontally along the length direction of the connecting rod 13, thereby adjusting the positions of the connecting member 11 and the connecting ring 6 to achieve the effect of controlling the fluid flow rate. The accommodating groove 15 is used to play a guiding role during this process, restricting the moving direction of the connecting ring 6, so as to control the moving direction of the spring plunger 5, enabling it to stably use hydraulic pressure to deform the diaphragm 4.

[0025] As Figures 1 to 4 shown in the figure, in summary, through the structural arrangement, when the motor is installed on the pump body 3, the output shaft of the motor can be connected to the shaft connector 7 and drive it to rotate, so that the driving wheel 8 moves accordingly. During this process, since the driving wheel 8 is coaxially arranged with the eccentric shaft 9, every time the shaft connector 7 rotates one circle, the driving wheel 8 will push the spring plunger 5 once through the connecting ring 6, making it drive the diaphragm 4 to deform by using hydraulic pressure. And when it is necessary to adjust the stroke of the spring plunger 5, rotating the adjusting knob 12 can make the connecting member 11 move on the connecting rod 13, thereby pushing the connecting ring 6 to move. At this time, every time the shaft connector 7 rotates one circle, the stroke that the driving wheel 8 pushes the spring plunger 5 once will be shorter than that before adjustment, so as to achieve the effect of controlling the fluid flow rate.

[0026] The above are only the preferred embodiments of the present utility model, and the protection scope of the present utility model is not limited to the above embodiments. All technical solutions falling within the concept of the present utility model belong to the protection scope of the present utility model. It should be noted that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present utility model should also be regarded as within the protection scope of the present utility model.

Claims

1. A motor-driven diaphragm plunger metering pump, comprising a valve seat (1), a connecting seat (2) and a pump body (3) that are sequentially connected internally. A diaphragm (4) is provided between the valve seat (1) and the connecting seat (2). A spring plunger (5) for extending into the connecting seat (2) is provided in the pump body (3), and it is characterized in that: One end of the pump body (3) away from the connecting seat (2) is provided with an adjusting assembly. The spring plunger (5) is connected to the adjusting assembly through a connecting ring (6). A shaft connector (7) is rotatably connected to the pump body (3). The bottom end of the shaft connector (7) is detachably connected to a driving wheel (8) that is eccentrically arranged and located within the connecting ring (6). The driving wheel (8) abuts against one end of the connecting ring (6) facing the spring plunger (5).

2. The motor-driven diaphragm plunger metering pump according to claim 1, characterized in that: The bottom end of the shaft connector (7) is fixedly connected to an eccentric shaft (9). The driving wheel (8) is detachably connected to the outer wall of the eccentric shaft (9) and is coaxially arranged with it.

3. The motor-driven diaphragm plunger metering pump according to claim 2, wherein: The adjusting assembly includes a connecting plate (10), a connecting member (11) and an adjusting knob (12). The connecting plate (10) is fixedly connected to the connecting member (11). The adjusting knob (12) is rotatably connected to the outer wall of the pump body (3). The adjusting knob (12) is connected to the connecting member (11) through a connecting rod (13) that penetrates the pump body (3). The connecting member (11) moves horizontally along the length direction of the connecting rod (13).

4. The motor-driven diaphragm plunger metering pump according to claim 3, characterized in that: One end of the connecting rod (13) located within the pump body (3) is provided with threads. One end of the connecting member (11) away from the connecting plate (10) is threadedly connected to the connecting rod (13). The connecting member (11) is prevented from rotating along with the connecting rod (13) through a limiting groove (14). The limiting groove (14) is opened on the connecting ring (6). The connecting plate (10) is located within the limiting groove (14).

5. The motor-driven diaphragm plunger metering pump according to claim 4, characterized in that: Both the connecting plate (10) and the limiting groove (14) are horizontally arranged. A receiving groove (15) for receiving the connecting member (11) is opened on the connecting ring (6). The receiving groove (15) communicates with the limiting groove (14) and is located at the center of the limiting groove (14).

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