Plunger pump

Abstract

The utility model discloses a plunger pump which comprises a pump head, a pump body connected with the pump head, a sealing piece, a motor installed on the pump body, a lead screw connected with an output shaft of the motor and a plunger. Threads are arranged in the plunger and matched with the lead screw, the pump head is provided with a column groove and a pump opening, and the column groove is communicated with the pump opening; the plunger is arranged in the column groove; the sealing piece comprises an O-shaped sealing ring, a gasket and a spring, the gasket is clamped between the O-shaped sealing ring and the spring, the other end of the spring is in contact with the pump body, and the O-shaped sealing ring and the gasket are arranged between the inner wall of the column groove and the plunger. Due to the fact that the O-shaped sealing ring and the gasket are adopted in the sealing piece, the spring abuts against the gasket, sealing is achieved, piston motion resistance of the plunger is small, resistance consistency is good, the overall size is small, the weight is light, the sealing effect is good, the service life is long, and premature failure of sealing is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of pumps, in particular to a plunger pump. Background Art

[0002] At present, plunger pumps on the market are used in in vitro diagnostic equipment or laboratory instruments to achieve precise absorption, transfer and filling of liquids. The structure of plunger pumps on the market mainly uses polymer materials for sealing, while plungers made of plastic materials are prone to wear and tear, which can easily cause premature seal failure.

[0003] Therefore, the prior art has defects and needs to be improved. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a plunger pump to solve the problem of premature seal failure mentioned in the background technology.

[0005] The technical solution of the utility model is as follows: a plunger pump is provided, comprising: a pump head, a pump body connected to the pump head, a seal, a motor mounted on the pump body, a screw connected to the output shaft of the motor, and a plunger; the plunger is provided with a thread and cooperates with the screw, the pump head is provided with a column groove and a pump port, the column groove is connected to the pump port; the plunger is arranged in the column groove; the seal comprises: an O-ring, a gasket, and a spring, the gasket is sandwiched between the O-ring and the spring, the other end of the spring is in contact with the pump body, and the O-ring and the gasket are arranged between the inner wall of the column groove and the plunger. When the motor is running, the rotation of the output shaft of the motor will drive the screw to rotate, thereby realizing the forward and backward movement of the plunger in the column groove, thereby realizing the function of sucking and discharging the liquid. Since the seal adopts O-ring and gasket, and the gasket is supported by the spring, the O-ring can effectively ensure the sealing between the plunger and the column groove. The O-ring is pressed by the spring, the piston movement resistance of the plunger is small, the resistance is consistent, the overall volume is small, the weight is light, the sealing effect is good, the service life is long, and the premature failure of the seal is avoided.

[0006] Furthermore, the plunger pump further includes: a U-shaped photoelectric sensor, the plunger includes a detection bar, one side of the pump body is a moving groove, the detection bar is arranged on the moving groove, and the U-shaped photoelectric sensor spans the moving groove. The cooperation between the U-shaped photoelectric sensor and the detection bar can determine whether the plunger has moved into place.

[0007] Furthermore, the pump body is threadedly connected or bonded to the pump head.

[0008] Furthermore, the pump port is a threaded hole or an inverted tapered hole.

[0009] Furthermore, the motor is a stepping motor.

[0010] By adopting the above scheme, the utility model provides a plunger pump. Since the sealing member adopts an O-ring and a gasket, and the gasket is supported by a spring, it can effectively ensure that the O-ring effectively seals the plunger and the column groove. The O-ring is pressed by the spring, the piston movement resistance of the plunger is small, the resistance is consistent, the overall volume is small, the weight is light, the sealing effect is good, the service life is long, and premature failure of the seal is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0012] Figure 2 for Figure 1 Cross-sectional view of an embodiment. DETAILED DESCRIPTION

[0013] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0014] See also Figure 1 and Figure 2 The utility model provides a plunger pump, comprising: a pump head 10, a pump body 11 connected to the pump head 10, a sealing member, a motor 12 mounted on the pump body 11, a screw rod 13 connected to the output shaft of the motor 12, and a plunger 14; the plunger 14 is provided with a thread and cooperates with the screw rod 13, the pump head 10 is provided with a column groove 15 and a pump port 16, the column groove 15 is communicated with the pump port 16; the plunger 14 is arranged in the column groove 15; the sealing member comprises: an O-ring 17, a gasket 18, and a spring 19, the gasket 18 is sandwiched between the O-ring 17 and the spring 19, the other end of the spring 19 is in contact with the pump body 11, and the O-ring 17 and the gasket 18 are arranged between the inner wall of the column groove 15 and the plunger 14. When the motor 12 is running, the rotation of the output shaft of the motor 12 will drive the screw rod 13 to rotate, so that the plunger 14 can move back and forth in the column groove 15, so as to achieve the function of sucking and discharging liquid. Since the sealing member adopts an O-ring 17 and a gasket 18, and the gasket 18 is supported by a spring 19, the O-ring 17 can effectively ensure the sealing between the plunger 14 and the column groove 15. The O-ring 17 is pressed tightly by the spring 19, the piston movement resistance of the plunger 14 is small, the resistance is consistent, the overall volume is small, the weight is light, the sealing effect is good, the service life is long, and premature failure of the seal is avoided.

[0015] In this embodiment, the plunger pump further includes: a U-shaped photoelectric sensor 20, the plunger 14 includes a detection bar 21, one side of the pump body 11 is a moving groove, the detection bar 21 is arranged on the moving groove, and the U-shaped photoelectric sensor 20 spans the moving groove. The cooperation between the U-shaped photoelectric sensor 20 and the detection bar 21 can determine whether the plunger 14 has moved into place.

[0016] In this embodiment, the pump body 11 is threadedly connected to the pump head 10. The pump port 16 is a threaded hole. The motor 12 is a stepping motor.

[0017] To sum up, the utility model provides a plunger pump. Since the sealing member adopts an O-ring and a gasket, and the gasket is supported by a spring, the O-ring can effectively ensure the sealing between the plunger and the column groove. The O-ring is pressed by the spring, the piston movement resistance of the plunger is small, the resistance is consistent, the overall volume is small, the weight is light, the sealing effect is good, the service life is long, and premature failure of the seal is avoided.

[0018] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A plunger pump, characterized in that: include: A pump head, a pump body connected to the pump head, a sealing component, a motor installed on the pump body, a screw connected to the output shaft of the motor, and a plunger; the plunger is provided with a thread and cooperates with the screw, the pump head is provided with a column groove and a pump port, the column groove is connected to the pump port; the plunger is arranged in the column groove; the sealing component includes: an O-ring, a gasket, and a spring, the gasket is clamped between the O-ring and the spring, the other end of the spring is in contact with the pump body, and the O-ring and gasket are arranged between the inner wall of the column groove and the plunger.

2. A plunger pump according to claim 1, characterized in that: Also includes: A U-shaped photoelectric sensor, wherein the plunger includes a detection strip, one side of the pump body is a moving groove, the detection strip is arranged on the moving groove, and the U-shaped photoelectric sensor spans the moving groove.

3. A plunger pump according to claim 1, characterized in that: The pump body is threadedly connected or bonded to the pump head.

4. A plunger pump according to claim 1, characterized in that: The pump port is a threaded hole or an inverted tapered hole.

5. A plunger pump according to claim 1, characterized in that: The motor is a stepping motor.

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