Injection pump

Abstract

The utility model provides an injection pump, which relates to the technical field of sample introduction devices, and comprises a multi-channel selector valve and a sample injector, the multi-channel selector valve is provided with an injection channel, a liquid inlet channel and at least one liquid outlet channel; the sample injector comprises a shell and a piston matched with the shell, an outlet of the shell is communicated with the injection channel, and the piston is configured to be driven by a pushing assembly to move along a straight line; wherein the multi-channel selection valve and the pushing assembly are driven by a control piece to work in a matched mode, when the injection channel is communicated with the liquid inlet channel, the pushing assembly drives the piston to suck liquid, or when the injection channel is communicated with the liquid outlet channel, the pushing assembly drives the piston to discharge liquid. Therefore, the problem that an operator is inconvenient to use due to the fact that a pipe fitting needs to be frequently inserted and pulled in the liquid suction and drainage process of an existing injection pump is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of sample injection devices, in particular to a syringe pump. Background Art

[0002] Syringe pumps have the characteristics of high precision and smooth flow in liquid transmission, so they are widely used in the fields of biology, medicine, chemical industry, etc. The inlet and outlet of the syringe (injector) in the syringe pump are usually the same, connected to the aspiration tube when aspirating liquid and connected to the discharge tube when discharging liquid. Therefore, the inlet and outlet need to be frequently switched to connect different pipes during the process of aspirating and discharging liquid, and the pipes are frequently plugged and unplugged, which is inconvenient for operators to use. Utility Model Content

[0003] The utility model discloses a syringe pump, aiming to improve the problem that pipes need to be frequently plugged and pulled out during the liquid aspiration and liquid discharge process of the existing syringe pump, which causes inconvenience to operators.

[0004] The utility model adopts the following scheme:

[0005] A syringe pump comprises a multi-channel selection valve and an injector, wherein the multi-channel selection valve has an injection channel, an inlet channel and at least one outlet channel; the injector comprises a shell and a piston adapted to the shell, the outlet of the shell is connected to the injection channel, and the piston is configured to be driven by a pushing assembly to move in a straight line; wherein the multi-channel selection valve and the pushing assembly are driven via a control member to cooperate in operation, and when the injection channel is connected to the inlet channel, the pushing assembly drives the piston to absorb liquid, or when the injection channel is connected to the outlet channel, the pushing assembly drives the piston to discharge liquid.

[0006] As a further improvement, the pushing assembly includes a first motor, a screw rod, a nut, a slider and a slide rail. The first motor is electrically connected to the control component and is used to drive the screw rod to rotate. The nut is threadedly connected to the screw rod, and the slider is adapted to the slide rail and linked with the nut, thereby converting the circular motion of the screw rod into the linear motion of the slider.

[0007] As a further improvement, the piston is connected to the slider via a fastener so that the piston moves with the slider.

[0008] As a further improvement, a sensing bracket is disposed on one side of the slider, and when the sensing bracket moves to align with the switch on the control member, the stroke of the piston returns to zero.

[0009] As a further improvement, the two sides of the slide rail are provided with recessed slide grooves, and the sliding block is provided with convex guide portions corresponding to the slide grooves.

[0010] As a further improvement, the length of the screw rod can be adapted to a 10-25 ml injector.

[0011] As a further improvement, the multi-channel selection valve includes a rotor and an upper cover, the rotor is driven to rotate by a second motor, and the second motor is electrically connected to the control component.

[0012] By adopting the above technical solution, the utility model can achieve the following technical effects:

[0013] The outlet of the sampler is connected to the injection channel, and the control unit drives the multi-channel selection valve to cooperate with the push assembly to achieve automatic liquid aspiration and discharge. There is no need to plug and unplug pipes during the aspiration and discharge process. When aspiration is required, the control unit drives the injection channel of the multi-channel selection valve to connect with the liquid inlet channel, and the push assembly drives the piston to move to aspirate; when discharge is required, the control unit drives the injection channel of the multi-channel selection valve to connect with the liquid outlet channel, and the push assembly drives the piston to move to discharge, which is convenient for operators to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a structural schematic diagram of one embodiment of the utility model;

[0016] Figure 2 yes Figure 1 Schematic diagram of the structure from another perspective;

[0017] Figure 3 It is an exploded view of one embodiment of the utility model;

[0018] Figure 4 It is a cross-sectional view of one embodiment of the utility model.

[0019] icon:

[0020] 1-multi-channel selection valve; 11-injection channel; 12-liquid outlet channel; 13-rotor; 14-upper cover; 15-second motor;

[0021] 2-injector; 21-housing; 22-piston;

[0022] 31-first motor; 32-screw rod; 33-nut; 34-slider; 341-sensing bracket; 35-slide rail; 36-fastener;

[0023] 4- Control parts;

[0024] 5- base;

[0025] 6- Shell. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0027] Example

[0028] Combination Figures 1 to 4 The present embodiment provides a syringe pump, comprising a multi-channel selection valve 1 and an injector 2, wherein the multi-channel selection valve 1 has an injection channel 11, a liquid inlet channel and at least one liquid outlet channel 12; the injector 2 comprises a shell 21 and a piston 22 adapted to the shell 21, the outlet of the shell 21 is connected to the injection channel 11, and the piston 22 is configured to be driven by a pushing assembly to move along a straight line; wherein the multi-channel selection valve 1 and the pushing assembly are driven via a control member 4 to cooperate in operation, when the injection channel 11 is connected to the liquid inlet channel, the pushing assembly drives the piston 22 to absorb liquid, or when the injection channel 11 is connected to the liquid outlet channel 12, the pushing assembly drives the piston 22 to discharge liquid.

[0029] It should be noted that, in this embodiment, the outlet of the sample injector 2 is connected to the injection channel 11, and the control component 4 drives the multi-channel selection valve 1 to cooperate with the push component, so as to automatically realize the aspiration and discharge of liquid. There is no need to plug and unplug the pipes during the aspiration and discharge process. When aspiration is required, the control component 4 drives the injection channel 11 of the multi-channel selection valve 1 to be connected to the liquid inlet channel, and the push component drives the piston 22 to move to aspirate liquid; when discharge is required, the control component 4 drives the injection channel 11 of the multi-channel selection valve 1 to be connected to the liquid outlet channel 12, and the push component drives the piston 22 to move to discharge liquid, which is convenient for operators to use.

[0030] In a preferred embodiment, the injection pump includes a base 5 and a housing 6, the housing 6 is arranged outside the base 5, and the multi-channel selection valve 1, the injector 2, the control member 4, and the push assembly are all arranged on the base 5. The push assembly includes a first motor 31, a screw rod 32, a nut 33, a slider 34, and a slide rail 35. The first motor 31 is electrically connected to the control member 4 and is used to drive the screw rod 32 to rotate. The nut 33 is screwed to the screw rod 32. The slider 34 is adapted to the slide rail 35 and is linked with the nut 33, so as to convert the circular motion of the screw rod 32 into the linear motion of the slider 34. The piston 22 and the slider 34 are connected via a fastener 36 so that the piston 22 moves with the slider 34. The fastener 36 can be a screw, a bolt, a pin, etc. Further, the two sides of the slide rail 35 are concavely provided with a slide groove, and the slider 34 is convexly provided with a guide portion corresponding to the slide groove, and the guide portion is adapted to the slide groove. The cross section of the slide groove can be semicircular, but is not limited thereto. In this embodiment, the configuration of the screw rod 32 and the slide rail 35 can ensure the smooth movement of the piston 22, thereby ensuring the accuracy of liquid suction and discharge.

[0031] In other embodiments, the length of the screw rod 32 can be adapted to a 10-25 ml injector, thereby being compatible with injectors of different capacities or lengths, and avoiding the problem of being unable to assemble due to length errors caused by different suppliers. Of course, the length of the screw rod 32 can be set to other lengths to be compatible with more models or capacities of injectors, so as to improve the versatility of the syringe pump and save equipment costs.

[0032] On the basis of the above embodiments, in an optional embodiment of the utility model, the multi-channel selector valve 1 includes a rotor 13 and an upper cover 14, the rotor 13 is driven to rotate by a second motor 15, and the second motor 15 is electrically connected to the control member 4. Among them, a connecting groove is provided on the rotor 13, and an injection channel 11, a liquid inlet channel and a liquid outlet channel 12 are provided on the upper cover 14. The connecting groove is arranged to always be connected to the injection channel 11, and is driven by the second motor 15 to communicate with the liquid inlet channel or the liquid outlet channel 12. In other embodiments, the embodiment can be provided with 3, 6, 8, 10 or 12 liquid outlet channels 12, but is not limited thereto and is not specifically limited. In one embodiment, the liquid inlet channel and the liquid outlet channel 12 are arranged equidistantly around the circumferential direction of the multi-channel selector valve 1. In another embodiment, the working principle of the multi-channel selector valve 1 can refer to a selector valve head and a selector valve with an injection channel disclosed in Chinese patent CN217842790U.

[0033] It should be mentioned that the control component 4 includes a control panel and a circuit board. The circuit board is triggered by buttons on the control panel or other human-machine interaction interfaces. The circuit board is electrically connected to the first motor 31 and the second motor 15. The circuit principle of the circuit board is existing technology and will not be repeated here.

[0034] In other embodiments, a sensing bracket 341 is disposed on one side of the slider 34, and when the sensing bracket 341 moves to align with the switch on the control member 4, the stroke of the piston 22 returns to zero. For example, the starting position of the piston 22 sucking liquid is the "zero position", and the sensing bracket 341 moves synchronously during the movement of the piston 22, and moves in a direction away from the "zero position"; when the piston 22 discharges liquid, it moves from the current position toward the "zero position", and when the sensing bracket 341 moves to align with the switch on the control member 4, the piston 22 returns to the initial position, that is, the "zero position", so as to accurately control the suction and discharge of liquid.

[0035] The above are only preferred implementations of the present utility model. The protection scope of the present utility model is not limited to the above embodiments. All technical solutions under the concept of the present utility model belong to the protection scope of the present utility model.

Claims

1. A syringe pump, characterized in that: include: A multi-channel selection valve having an injection channel, a liquid inlet channel and at least one liquid outlet channel; An injector, comprising a housing and a piston adapted to the housing, wherein an outlet of the housing is communicated with the injection channel, and the piston is configured to be driven by a pushing assembly to move in a straight line; The multi-channel selection valve and the pushing assembly are driven by a control member to cooperate in operation. When the injection channel is connected to the liquid inlet channel, the pushing assembly drives the piston to absorb liquid, or when the injection channel is connected to the liquid outlet channel, the pushing assembly drives the piston to discharge liquid.

2. The injection pump according to claim 1, characterized in that The pushing assembly includes a first motor, a screw rod, a nut, a slider and a slide rail. The first motor is electrically connected to the control component and is used to drive the screw rod to rotate. The nut is threadedly connected to the screw rod, and the slider is adapted to the slide rail and linked with the nut, thereby converting the circular motion of the screw rod into the linear motion of the slider.

3. The injection pump according to claim 2, characterized in that: The piston is connected to the slider via a fastener so that the piston moves with the slider.

4. The injection pump according to claim 2, characterized in that: A sensing bracket is disposed on one side of the sliding block. When the sensing bracket moves to align with the switch on the control member, the stroke of the piston returns to zero.

5. The injection pump according to claim 2, characterized in that: Slide grooves are concavely arranged on both sides of the slide rail, and guide portions are convexly arranged on the sliding block corresponding to the slide grooves.

6. The injection pump according to claim 2, characterized in that: The length of the screw rod can be adapted to a 10-25 ml injector.

7. The injection pump according to claim 1, characterized in that The multi-channel selection valve includes a rotor and an upper cover. The rotor is driven to rotate by a second motor, and the second motor is electrically connected to the control element.

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