Multi-channel fluid control injection pump

Abstract

The utility model belongs to the technical field of injection pumps, and particularly relates to a multi-channel fluid control injection pump which comprises a shell, an injector, a lead screw, a stepping motor, a multi-channel selector valve and a transmission assembly, and the stepping motor is fixed inside the shell and fixedly connected with the upper end of the lead screw extending in the longitudinal direction. The multi-channel selection valve is transversely arranged on the shell above the stepping motor in a penetrating mode, a valve head of the multi-channel selection valve is located on the outer side of a panel of the shell, a common port of the valve head of the multi-channel selection valve is communicated with the liquid outlet end of the injector, the transmission assembly comprises a sliding rail and a U-shaped block, the sliding rail is fixed to the inner side of the lower portion of the panel of the shell and extends in the longitudinal direction, and the U-shaped block is fixed to the sliding rail. A receding groove extending in the longitudinal direction is formed in the edge of the lower portion of a panel of the shell, the U-shaped block penetrates through the receding groove, one supporting leg, located on the outer side of the shell, of the U-shaped block is detachably connected with the piston rod end of the injector, a threaded hole is formed in the other supporting leg of the U-shaped block and is in threaded connection with the lead screw, and a sliding block is arranged in an opening of the U-shaped block and is in sliding connection with the sliding rail.

Description

Technical Field

[0001] The utility model belongs to the technical field of injection pumps, and particularly relates to a multi-channel fluid control injection pump. Background Art

[0002] An injection pump is used to drive a syringe to achieve automatic injection of liquid. It can not only greatly reduce the labor intensity of staff, but also accurately control the usage amount of various reagents. Therefore, it is widely used in industries such as fine chemical industry, medicine, related laboratories, chemical synthesis, and emerging flow chemistry for precise transfer of various liquids.

[0003] Currently, common injection pumps on the market usually have a housing, a syringe, a stepper motor, a lead screw, and a nut. The syringe is installed outside the housing panel through a clamping block. The lead screw is arranged inside the housing and is driven by the stepper motor to move reciprocally. The nut is threadedly connected to the lead screw and is connected to the piston rod end of the syringe through a pushing block. The syringe contains liquid to achieve high-precision and smooth pulsation-free liquid transmission. However, when the existing injection pump is used for multi-channel fluid control in combination with a multi-way valve, it is often necessary to replace syringes of different lengths according to actual needs. However, due to the installation limitation of the clamping block on the syringe, there is a problem that syringes of different lengths cannot be adaptively installed on the existing housing of the injection pump. Therefore, there is an urgent need to improve the existing injection pump to provide a multi-channel fluid control injection pump with a simple structure, good stability, and compatibility. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a multi-channel fluid control injection pump with reasonable design, simple structure, good stability, and compatibility for solving the problems existing in the prior art.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A multi-channel fluid control injection pump includes a housing, a syringe, a lead screw, and a stepper motor. The stepper motor is fixed inside the housing and is fixedly connected to the upper end of the longitudinally extending lead screw. It further includes a multi-way selection valve and a transmission assembly. The multi-way selection valve is transversely arranged through the housing above the stepper motor. The valve head of the multi-way selection valve is located outside the housing panel. The common port of the valve head of the multi-way selection valve is communicated with the liquid outlet end of the syringe. The transmission assembly includes a slide rail and a U-shaped block. The slide rail is fixed inside the lower part of the housing panel and extends longitudinally. A longitudinally extending relief groove is opened at the lower edge of the housing panel. The U-shaped block passes through the relief groove. One leg of the U-shaped block located outside the housing is detachably connected to the piston rod end of the syringe. A threaded hole is provided on the other leg of the U-shaped block and is threadedly connected to the lead screw. A slider is arranged inside the opening of the U-shaped block and is slidably connected to the slide rail.

[0007] Further, it further includes a control circuit board, and the control circuit board is electrically connected to the stepping motor and the multi-channel selection valve respectively.

[0008] Preferably, the transmission assembly further includes a tightening screw. One leg of the U-shaped block and the piston rod end of the syringe are correspondingly provided with connecting holes, and the tightening screw is threadedly connected in the connecting holes for detachably connecting one leg of the U-shaped block and the piston rod end of the syringe into one body.

[0009] Preferably, the housing includes a panel and a rear cover. The panel is formed by connecting a front plate and a left plate to form an L-shaped structure. The cross-section of the rear cover is in a U-shape with two unequal legs, and the rear cover is detachably connected to the panel by screws to form a box structure.

[0010] Preferably, a plurality of first heat dissipation holes are correspondingly provided on the side wall of the rear cover for the stepping motor.

[0011] Preferably, a plurality of second heat dissipation holes are correspondingly provided on the side wall of the rear cover for the multi-channel selection valve.

[0012] Preferably, a support bar for supporting the multi-channel selection valve is fixedly connected to the inner side of the left plate of the panel.

[0013] Preferably, a support cross plate for supporting the stepping motor is fixedly connected to the inner side of the front plate of the panel.

[0014] Preferably, a support vertical plate is connected to the rear end of the support cross plate, and the support vertical plate is fixedly connected to the inner side of the left plate of the panel.

[0015] Preferably, an installation groove for installing a sensor is correspondingly provided on the support vertical plate for the lead screw.

[0016] The utility model adopts the above technical solutions and has the following technical effects:

[0017] With the multi-channel selection valve provided in the present utility model, the liquid sample in the syringe can be selected and switched through the multi-channel selection valve to distribute the flow path, realizing the precise transfer of the liquid sample. With the transmission assembly provided in the present utility model, not only can a simpler structure be adopted to drive the piston rod of the syringe to move, but also the slider and the slide rail can be used to guide and restrict the movement of the U-shaped block, so that when the stepping motor drives the lead screw to rotate in the forward and reverse directions, the U-shaped block and the piston rod of the syringe can be driven to lift longitudinally to realize the transfer of the liquid sample. This structure can make the lifting of the U-shaped block and the piston rod of the syringe more stable. In addition, since the two ends of the syringe are directly connected to the valve head common port of the multi-channel selection valve and a leg of the U-shaped block located outside the housing respectively, the syringe is not restricted by the installation position of the traditional clamping block, and the housing can be compatible with the installation of syringes from different manufacturers and with different lengths, so that different-length syringes can be replaced more conveniently and flexibly according to actual needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. The following is the description of the drawings:

[0019] Figure 1 Schematic three-dimensional structure diagram of the present utility model;

[0020] Figure 2 Exploded view of the present utility model from one perspective;

[0021] Figure 3 Exploded view of the present utility model from another perspective;

[0022] Figure 4 Schematic structure diagram of the transmission assembly of the present utility model;

[0023] Figure 5 Schematic three-dimensional structure diagram of the U-shaped block of the present utility model.

[0024] In the figure:

[0025] 100, housing; 110, panel; 120, rear cover; 130, relief groove; 140, first heat dissipation hole; 150, second heat dissipation hole; 160, support bar; 170, support cross plate; 180, support vertical plate; 181, installation groove; 190, storage groove; 200, syringe; 300, lead screw; 400, stepping motor; 500, control circuit board; 600, multi-channel selection valve; 700, transmission assembly; 710, slide rail; 720, U-shaped block; 721, threaded hole; 722, connection hole; 730, slider; 740, tightening screw. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The embodiments described below are only a part of the embodiments of the present utility model and do not represent all embodiments consistent with the present utility model. Now, in conjunction with the accompanying drawings, the exemplary embodiments are described as follows:

[0027] Referring to Figures 1-5 As shown in one of them, the multi-channel fluid control injection pump of the present utility model includes a housing 100, a syringe 200, a lead screw 300, and a stepper motor 400. The stepper motor 400 is fixed inside the housing 100 and fixedly connected to the upper end of the lead screw 300 extending longitudinally. It further includes a multi-channel selection valve 600 and a transmission assembly 700. The multi-channel selection valve 600 is horizontally disposed through the housing 100 above the stepper motor 400. The valve head of the multi-channel selection valve 600 is located outside the panel 110 of the housing 100. The common port of the valve head of the multi-channel selection valve 600 is communicated with the liquid outlet end of the syringe 200, so that the liquid sample in the syringe 200 can be selected and switched through the multi-channel selection valve 600 to distribute the flow path, thereby realizing the precise transfer of the liquid sample; the transmission assembly 700 includes a slide rail 710 and a U-shaped block 720. The slide rail 710 is fixed inside the lower part of the panel 110 of the housing 100 and extends longitudinally. A relief groove 130 extending longitudinally is formed at the lower edge of the panel 110 of the housing 100. The U-shaped block 720 is disposed through the relief groove 130. One leg of the U-shaped block 720 located outside the housing 100 is detachably connected to the piston rod end of the syringe 200. A threaded hole 721 is provided on the other leg of the U-shaped block 720 and is threadedly connected to the lead screw 300. A slider 730 is disposed inside the opening of the U-shaped block 720 and is slidably connected to the slide rail 710.

[0028] In this embodiment, by providing the transmission assembly 700, not only can a simpler structure be used to drive the piston rod of the syringe 200 to move, but also the slider 730 and the slide rail 710 can be used to guide and restrict the movement of the U-shaped block 720, so that when the stepper motor 400 drives the lead screw 300 to rotate in the forward and reverse directions, the U-shaped block 720 and the piston rod of the syringe 200 can be driven to move up and down longitudinally to realize the transfer of the liquid sample. This structure can make the up and down movement of the U-shaped block 720 and the piston rod of the syringe 200 more stable; in addition, since the two ends of the syringe 200 are directly connected to the common port of the valve head of the multi-channel selection valve 600 and one leg of the U-shaped block 720 located outside the housing 100 respectively, the syringe 200 can be unrestricted by the installation position of the traditional clamping block, and the housing 100 can be compatible with installing syringes 200 from different manufacturers and with different lengths, so that the syringe 200 with different lengths can be replaced more conveniently and flexibly according to actual needs.

[0029] As a preferred embodiment, based on the above structure, further, it further includes a control circuit board 500, and the control circuit board 500 is electrically connected to the stepper motor 400 and the multi-channel selection valve 600 respectively.

[0030] In this embodiment, by setting the control circuit board 500, the stepper motor 400 can be controlled to rotate forward and backward, so as to drive the piston rod of the syringe 200 to lift through the lead screw 300 and the U-shaped block 720. The running accuracy of the U-shaped block 720 on the lead screw 300 is better controlled. Also, according to the existing technology in the art, a control pulse signal can be sent to the drive motor of the multi-channel selection valve 600 to control the drive motor of the multi-channel selection valve 600 to drive the rotor inside the valve head to rotate, so as to selectively change the channel connected to the common port, thereby achieving the purpose of selecting and switching to allocate the flow path. It should be noted that the control circuit board 500, the multi-channel selection valve 600, and the syringe 200 of the present utility model are all conventional existing technologies in the art. For example, the control circuit board 500 can be a single-chip microcomputer of STM32F401CCU6, the specification of the syringe 200 can be 10 - 25 ml; the number of channels of the multi-channel selection valve 600 can be 3, 6, 8, 10, or 12, so details are not described herein again.

[0031] As a preferred embodiment, based on the above structure, further, the transmission assembly 700 further includes a tightening screw 740. A connection hole 722 is correspondingly opened at one leg of the U-shaped block 720 and the piston rod end of the syringe 200. The tightening screw 740 is threadedly connected in the connection hole 722 for detachably connecting one leg of the U-shaped block 720 and the piston rod end of the syringe 200 into one body.

[0032] As a preferred embodiment, based on the above structure, preferably, the housing 100 includes a front panel 110 and a rear cover 120. The front panel 110 is formed by connecting a front plate and a left plate to form an L-shaped structure. The cross-section of the rear cover 120 is in a U shape with two unequal legs. The rear cover 120 is detachably connected to the front panel 110 by screws to form a box structure.

[0033] As a preferred embodiment, based on the above structure, further, a plurality of first heat dissipation holes 140 are correspondingly opened on the side wall of the rear cover 120 for the stepper motor 400, so as to improve the heat dissipation effect of the stepper motor 400.

[0034] As a preferred embodiment, based on the above structure, further, a plurality of second heat dissipation holes 150 are correspondingly opened on the side wall of the rear cover 120 for the multi-channel selection valve 600, so as to improve the heat dissipation effect of the drive motor of the multi-channel selection valve 600.

[0035] As a preferred embodiment, on the basis of the above structure, further, a support bar 160 for supporting the multi-channel selection valve 600 is fixedly connected to the inner side of the left plate of the panel 110, so as to support the drive motor of the multi-channel selection valve 600.

[0036] As a preferred embodiment, on the basis of the above structure, further, a support cross plate 170 for supporting the stepping motor 400 is fixedly connected to the inner side of the front plate of the panel 110, so as to facilitate the installation of the output shaft of the stepping motor 400 vertically downward, so that the upper end of the lead screw 300 is fixedly connected to the output shaft of the stepping motor 400 and extends longitudinally.

[0037] As a preferred embodiment, on the basis of the above structure, further, a support vertical plate 180 is connected to the rear end of the support cross plate 170, and the support vertical plate 180 is fixedly connected to the inner side of the left plate of the panel 110, so as to support the rear end of the support cross plate 170 by using the support vertical plate 180 and improve the support stability of the support cross plate 170 for the stepping motor 400.

[0038] On the basis of the above structure, preferably, the upper and lower ends of the control circuit board 500 are respectively fixed to the support bar 160 and the support vertical plate 180 by screws.

[0039] As a preferred embodiment, on the basis of the above structure, further, an installation groove 181 for installing a sensor is provided on the support vertical plate 180 corresponding to the lead screw 300, so as to facilitate the installation of an inductive switch such as a position sensor in the installation groove 181 for signal acquisition.

[0040] As a preferred embodiment, on the basis of the above structure, further, a receiving groove 190 protruding backward is provided at the upper part of the rear cover 120 corresponding to the rear end of the multi-channel selection valve 600, so as to facilitate the support and storage of the rear end of the multi-channel selection valve 600.

[0041] The above are only the preferred specific embodiments of the present invention and are not intended to limit the protection scope of the present invention; all equivalent changes, modifications, substitutions and variations made by those skilled in the art in this technical field based on the concept of the present invention on the basis of the prior art through logical analysis, reasoning or limited experiments shall fall within the protection scope determined by the claims.

Claims

1. A multi-channel fluid control injection pump, comprising a housing (100), a syringe (200), a lead screw (300) and a stepper motor (400), wherein the stepper motor (400) is fixed inside the housing (100) and fixedly connected to the upper end of the longitudinally extending lead screw (300), and is characterized in that: It further includes a multi-channel selection valve (600) and a transmission assembly (700). The multi-channel selection valve (600) is horizontally penetrated through a housing (100) above the stepping motor (400). The valve head of the multi-channel selection valve (600) is located outside the panel (110) of the housing (100). The common port of the valve head of the multi-channel selection valve (600) is communicated with the liquid outlet end of the syringe (200). The transmission assembly (700) includes a slide rail (710) and a U-shaped block (720). The slide rail (710) is fixed to the inner side of the lower part of the panel (110) of the housing (100) and extends longitudinally. A relief groove (130) extending longitudinally is formed at the lower edge of the panel (110) of the housing (100). The U-shaped block (720) is penetrated through the relief groove (130). One leg of the U-shaped block (720) located outside the housing (100) is detachably connected to the piston rod end of the syringe (200). A threaded hole (721) is provided on the other leg of the U-shaped block (720) and is threadedly connected to the lead screw (300). A slider (730) is provided inside the opening of the U-shaped block (720) and is slidably connected to the slide rail (710).

2. The multi-channel fluid control injection pump according to claim 1, characterized in that: It further includes a control circuit board (500). The control circuit board (500) is electrically connected to the stepping motor (400) and the multi-channel selection valve (600) respectively.

3. The multi-channel fluid control injection pump according to claim 1, wherein: The transmission assembly (700) further includes a tightening screw (740). Corresponding connection holes (722) are formed in one leg of the U-shaped block (720) and the piston rod end of the syringe (200). The tightening screw (740) is threadedly connected in the connection hole (722) for detachably connecting one leg of the U-shaped block (720) and the piston rod end of the syringe (200) into one body.

4. The multi-channel fluid control injection pump according to claim 1, wherein: The housing (100) includes a panel (110) and a rear cover (120). The panel (110) is formed by connecting a front plate and a left plate to form an L-shaped structure. The cross-section of the rear cover (120) is in a U-shape with two unequal legs. The rear cover (120) is detachably connected to the panel (110) by screws to form a box structure.

5. The multi-channel fluid control injection pump according to claim 4, wherein: A plurality of first heat dissipation holes (140) are formed in the side wall of the rear cover (120) corresponding to the stepping motor (400).

6. The multi-channel fluid control injection pump according to claim 4, wherein: A plurality of second heat dissipation holes (150) are formed in the side wall of the rear cover (120) corresponding to the multi-channel selection valve (600).

7. The multi-channel fluid control injection pump according to claim 4, characterized in that: A support bar (160) for supporting the multi-channel selection valve (600) is fixedly connected to the inner side of the left plate of the panel (110).

8. The multi-channel fluid control injection pump according to claim 4, characterized in that: A support cross plate (170) for supporting the stepping motor (400) is fixedly connected to the inner side of the front plate of the panel (110).

9. The multi-channel fluid control injection pump according to claim 8, wherein: A support vertical plate (180) is connected to the rear end of the support cross plate (170). The support vertical plate (180) is fixedly connected to the inner side of the left plate of the panel (110).

10. The multi-channel fluid control injection pump according to claim 9, wherein: An installation groove (181) for installing a sensor is formed in the support vertical plate (180) corresponding to the lead screw (300).

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