CN215979832U

CN215979832U - Plunger pump

Info

Publication number: CN215979832U
Application number: CN202120911943.5U
Authority: CN
Inventors: 张国家; 吴巍; 吴志伟; 雷冲
Original assignee: Orient Immunoassay Suzhou Medical Technology Co ltd
Current assignee: Orient Immunoassay Suzhou Medical Technology Co ltd
Priority date: 2021-03-29
Filing date: 2021-04-29
Publication date: 2022-03-08
Anticipated expiration: 2031-04-29
Also published as: CN215762073U

Abstract

The utility model discloses a plunger pump. A plunger pump, comprising: a housing, which is hollow; a plunger movably disposed within the housing; the plunger piston body is arranged on the shell, and a cavity for inserting the plunger piston is arranged on the plunger piston body; the sucker adapter is used for loading a sucker, is arranged on the plunger body and is provided with a liquid channel which can communicate the cavity with the inner cavity of the sucker; the plunger pump further includes: the air pressure detection device is used for detecting the air pressure in the cavity; the shell and/or the plunger pump are/is provided with an air pressure detection cavity which is communicated with the cavity through an air hole formed in the plunger body, and the air pressure detection device is positioned in the air pressure detection cavity. The plunger pump is provided with the air pressure detection device arranged in the plunger pump, and the air pressure detection device can detect the air pressure in the air pressure detection cavity communicated with the inner cavity of the plunger pump so as to judge whether the suction head is in contact with the liquid level. The utility model can carry out high-precision detection, and has compact structure and small volume.

Description

Plunger pump

Technical Field

The utility model belongs to the technical field of analysis and detection, and relates to a plunger pump.

Background

The plunger pump is an important device of a hydraulic system, is one of instruments commonly used in various industries, particularly for medical and biochemical tests, and has more severe requirements on the plunger pump, particularly on the aspects of accuracy, stability and precision. The plunger pump has wide application in biological detection analyzer, however, the existing plunger pump is often large in size and not flexible enough to use.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the utility model provides a plunger pump which is small in size and compact in structure.

In order to achieve the purpose, the utility model adopts the technical scheme that:

a plunger pump comprising:

a housing, which is hollow;

a plunger movably disposed within the housing;

the plunger piston body is arranged on the shell, and a cavity into which the plunger piston is inserted is arranged on the plunger piston body;

a tip adapter for loading a tip, the tip adapter being provided on the plunger body and having a liquid passage capable of communicating the cavity with an inner cavity of the tip;

the plunger pump further comprises:

the air pressure detection device is used for detecting the air pressure in the cavity;

the shell and/or be provided with the atmospheric pressure on the plunger pump and detect the chamber, the atmospheric pressure detects the chamber through seting up in the gas pocket on the plunger body with the cavity intercommunication, atmospheric pressure detection device is located in the atmospheric pressure detects the chamber.

Preferably, the air pressure detecting means includes an air pressure sensor.

Preferably, the air pressure sensor is arranged on a circuit board, a cover plate is covered on the circuit board, and the air pressure detection cavity is formed between the cover plate and the circuit board.

Preferably, the plunger pump further comprises a temperature sensor arranged on the circuit board, and the temperature sensor is located in the air pressure detection cavity.

Preferably, a controller is arranged on the circuit board, the air pressure sensor is electrically connected with the controller, the plunger pump further comprises a motor for driving the plunger to move, and the controller is further electrically connected with the motor.

Preferably, the cavity is integrally formed on the plunger body.

Preferably, the plunger is a ceramic plunger.

Preferably, the plunger pump further comprises a motor for driving the plunger to move linearly, and the motor and the plunger body are respectively located at two opposite sides of the housing.

Preferably, the plunger pump further comprises a suction head removing device for removing the suction head from the suction head adapter, the suction head removing device comprises a sleeve movably sleeved on the plunger body, a through hole for the suction head adapter to pass through is formed in one end of the sleeve, and the aperture of the through hole is smaller than the outer diameter of the suction head.

Preferably, the suction head removing device further comprises an elastic member for resetting the sleeve, and the elastic member is arranged on the plunger body. Compared with the prior art, the utility model has the following advantages by adopting the scheme:

according to the plunger pump, the air pressure detection device is arranged on the shell and/or the plunger body and is communicated with the cavity in the plunger body through the air hole in the plunger body, whether the suction head is in contact with the liquid level or not can be judged according to the change of air pressure, the detection precision is high, and meanwhile, the structure is compact and the size is small.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

FIG. 1 is an assembly view of a plunger pump of an embodiment;

FIG. 2 is a cross-sectional view of FIG. 1;

FIG. 3 is an exploded schematic view of the plunger pump of the embodiment;

fig. 4 is a schematic view of a suction head removal device according to an embodiment.

Wherein:

1. a linear motor; 2. a housing; 3. a plunger body; 4. a sleeve; 5. a plunger; 6. an air pressure detecting device; 7. a suction head adapter; 8. a suction head; 9. tightening the screw; 10. a spring; 11. a suction head removal device; 12. a cavity; 13. an air pressure detection chamber; 14. air holes; 15. an air pressure sensor; 16. a circuit board; 17. and (7) a cover plate.

Detailed Description

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the utility model may be more readily understood by those skilled in the art. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

Referring to fig. 1 to 4, a plunger pump of the present embodiment includes a hollow housing 2, a plunger 5 movably disposed in the housing 2, a plunger body 3 disposed on the housing 2, and a tip adaptor 7 disposed on the plunger body 3. The housing 2 is hollow and cylindrical and has an open upper end and a lower end. The plunger has a length direction along the up-down direction, and the plunger 5 can be inserted in the shell in a way of moving up and down; in particular, the plunger is a ceramic plunger. The plunger body 3 is fixedly arranged at the lower end part of the shell 2, a cavity 12 for inserting the plunger 5 is arranged on the plunger body 3, the cavity 12 is integrally formed on the plunger body 3, and the forming process is specifically integral injection molding; specifically, in this embodiment, the plunger body 3 is formed by machining an aluminum alloy, and the cavity 12 is formed therein after the machining. The lower part of the plunger 5 is inserted into the chamber 12 so as to be slidable up and down, and positive pressure or negative pressure is generated in the chamber 12 by the up-and-down movement of the plunger 5, whereby the pipette tip 8 can suck or discharge liquid. The tip adaptor 7 is fixed to the lower end portion of the plunger body 3, the lower end portion of the tip adaptor 7 is used for loading the tip 8, and the tip adaptor 7 has a liquid passage capable of communicating the cavity 12 with the inner cavity of the tip 8. The suction head adapter 7 is also provided with a sealing ring for preventing the joint part of the suction head adapter 7 and the suction head 8 from being not tight enough to cause liquid leakage. Specifically, the suction head adapter 7 is in a column shape extending up and down, the upper end part of the suction head adapter 7 is fixedly inserted into the plunger body, and the lower end part of the suction head adapter has a shape matched with the upper inner cavity of the suction head, so that the suction head adapter can be inserted into the suction head 8 to realize suction head loading; the tip 8 can also be detached from the lower end of the tip adapter 7.

The plunger pump further comprises a motor used for driving the plunger 5 to do linear motion, the motor is a linear motor 1, the linear motor 1 is fixed at the upper end of the shell 2, an output shaft of the linear motor 1 is connected with the upper end of the plunger 5, and the plunger 5 moves in the up-and-down direction under the driving action of the linear motor 1.

The plunger pump further comprises air pressure detection means 6 for detecting the air pressure in the chamber 12. Be provided with atmospheric pressure on the plunger pump and detect chamber 13, atmospheric pressure detects chamber 13 and communicates through gas pocket 14 and the cavity 12 of seting up on the plunger body 3, and atmospheric pressure detection device 6 is located atmospheric pressure and detects chamber 13. The air pressure detecting device 6 includes an air pressure sensor 15 for outputting a control signal according to a measurement value after detecting the air pressure of the air in the air pressure detecting chamber 13. The air pressure sensor 15 is disposed on a circuit board 16. The circuit board 16 is covered with a cover plate 17, the cover plate 17 is matched with the circuit board 16 to form a cavity, and the air pressure detection cavity 13 is positioned in the cavity. The circuit board 16 is provided with a controller, and the air pressure sensor 15 is electrically connected with the controller.

The plunger pump further comprises a temperature sensor arranged on the circuit board 16, the temperature sensor is used for detecting the temperature of the gas in the gas pressure detection cavity 13, and the temperature sensor is positioned in the gas pressure detection cavity 13. Temperature sensor and controller electric connection, thereby the controller can be according to the temperature value calculation temperature compensation value that temperature sensor detected and make the liquid level detect more accurate with the application of sample volume of liquid.

The controller is also electrically connected with the linear motor 1. So as to correspondingly control the operation (such as rotation direction, start and stop) of the linear motor 1 according to the detection values of the air pressure sensor 15 and the temperature sensor.

The plunger pump further comprises a suction head removing device 11 for removing the suction head 8 from the suction head adapter 7, wherein the suction head removing device 11 comprises a sleeve 4 which is sleeved on the plunger body 3 in a vertically movable mode, a through hole for the suction head adapter 7 to pass through is formed in the lower end portion of the sleeve 4, the aperture of the through hole is smaller than the outer diameter of the suction head 8, namely, the suction head 8 can be pushed to be removed from the suction head adapter 7 in the downward moving process through the movable sleeve 4, and other components (such as sheet metal parts on a detection instrument) can be used for completing the operation.

As shown in fig. 4, the pipette tip removing device 11 further includes an elastic member for restoring the sleeve 4, and the elastic member is fixed to the plunger pump through a jackscrew for restoring the sleeve 4 after the pipette tip removing is completed. As shown in fig. 1, the elastic member is fixed to the plunger body 3 by a set screw 9, and the set screw 9 is fixed to the plunger body 3 as a jack screw, and the elastic member is specifically a spring 10.

When the plunger pump enters the working state, the plunger pump is moved to the tip storage area, the tip adapter 7 is moved down to load the tip 8, and then the tip adapter 7 is moved away from the tip storage area together with the loaded tip 8. Before the plunger pump takes out the target liquid, the air pressure inside the air pressure detection chamber 13 is detected by the air pressure detection means 6 as a reference value. Thereafter, the plunger pump is moved to a position above the target liquid surface, and the pipette tip 8 is moved downward toward the target liquid surface until it contacts the target liquid surface. The air pressure detection device 6 detects the change of the air pressure value in the air pressure detection cavity 13, after the suction head 8 is judged to reach the liquid level of the target liquid, a control signal is sent to the controller through the air pressure sensor 15, the controller responds to the linear motor 1 after receiving the control signal, the linear motor drives the plunger 5 to move upwards through the output shaft, and negative pressure is formed in the inner cavity in the process that the plunger 5 moves upwards, so that the suction head 8 can suck liquid. The target liquid enters the pipette tip 8, by which the pipetting by the plunger pump is completed. In this process, the controller can also calculate a temperature compensation value according to the temperature value detected by the temperature sensor to more accurately detect the liquid level and the amount of the compensation liquid to be added.

As shown in fig. 3, the plunger body 3 may be a plunger cavity 12, the sleeve 4 may be a TIP removal device, and the circuit board 16 may be a sensor board. In addition, optional assemblies include a 3-axis stepper motor control card, which can better control the motor; the suction head seat can be adapted to suction heads with different sizes according to requirements; the XY linear motor motion mechanism, the Z-axis motion mechanism and the suction head removing device matched with the Z-axis motion mechanism can meet the use requirements of different directions.

The plunger pump of this embodiment has the atmospheric pressure detection device who locates on the plunger pump casing to through the gas pocket on the plunger body and the internal cavity intercommunication of plunger, this atmospheric pressure detection device can detect the atmospheric pressure in the atmospheric pressure detection intracavity that is linked together with the plunger pump inner chamber, thereby judges whether the suction head contacts with the liquid level according to the change of atmospheric pressure. This plunger pump formula plunger pump as an organic whole, cavity integrated into one piece are on the plunger pump. The detection performed by the embodiment has high-precision accuracy and repeatability, and meanwhile, the liquid level sensing has high sensitivity, the result is reliable, and the service life is long; besides, the size is small, the structure is compact, meanwhile, various customized configurations are selectable, and actual requirements under different conditions can be met.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are preferred embodiments, which are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A plunger pump comprising:

a housing, which is hollow;

a plunger movably disposed within the housing;

characterized in that, the plunger pump still includes:

2. The plunger pump of claim 1, wherein: the air pressure detection device comprises an air pressure sensor.

3. The plunger pump of claim 2, wherein: the air pressure sensor is arranged on a circuit board, a cover plate is arranged on the circuit board in a covering mode, and the air pressure detection cavity is formed between the cover plate and the circuit board.

4. The plunger pump of claim 3, wherein: the plunger pump further comprises a temperature sensor arranged on the circuit board, and the temperature sensor is located in the air pressure detection cavity.

5. The plunger pump of claim 3, wherein: the air pressure sensor is arranged on the circuit board, the air pressure sensor is electrically connected with the controller, the plunger pump further comprises a motor used for driving the plunger to move, and the controller is electrically connected with the motor.

6. The plunger pump of claim 1, wherein: the cavity is integrally formed on the plunger body.

7. The plunger pump of claim 1, wherein: the plunger is a ceramic plunger.

8. The plunger pump of claim 1, wherein: the plunger pump also comprises a motor for driving the plunger to move linearly, and the motor and the plunger body are respectively positioned at two opposite sides of the shell.

9. The plunger pump of claim 1, wherein: the plunger pump further comprises a suction head removing device used for enabling the suction head to be separated from the suction head adapter, the suction head removing device comprises a sleeve which is movably sleeved on the plunger body, a through hole for the suction head adapter to penetrate through is formed in one end portion of the sleeve, and the aperture of the through hole is smaller than the outer diameter of the suction head.

10. The plunger pump of claim 9, wherein: the sucker removing device further comprises an elastic piece used for enabling the sleeve to reset, and the elastic piece is arranged on the plunger body.