CN216669867U

CN216669867U - High-precision high-pressure injection pump

Info

Publication number: CN216669867U
Application number: CN202220013673.0U
Authority: CN
Inventors: 辛珍阳; 赵琳; 张福祥
Original assignee: Qingdao Zhongchuang Science Apparatus Public Research And Development Service Platform Co ltd
Current assignee: Qingdao Zhongchuang Science Apparatus Public Research And Development Service Platform Co ltd
Priority date: 2022-01-04
Filing date: 2022-01-04
Publication date: 2022-06-03
Anticipated expiration: 2032-01-04

Abstract

The utility model relates to the field of analytical detection instruments, in particular to a high-precision high-pressure injection pump which comprises a fixed frame, a fixed plate, a valve head, an injection mechanism and a slide block, wherein the valve head is fixedly arranged on the fixed frame; fixed plate and injection mechanism parallel arrangement and with mount fixed connection, slider and fixed plate butt and along the reciprocal sliding of fixed plate, fixed connection installation pole on the slider, installation pole run through the fixed plate, the fixed connecting block that sets up of plunger rod tip, fixed connecting block cup joints on the installation pole, fixed connecting block sets up the elastic connection piece respectively along the both sides of installation pole axis direction. According to the utility model, the floating positioning block and the elastic connecting block are used for compensating or eliminating action noises such as shaking generated in the moving process of the sliding block, so that the stable movement of the plunger rod is kept, and the structural sealing performance of the sample injector is ensured.

Description

High-precision high-pressure injection pump

Technical Field

The utility model relates to the field of analytical detection instruments, in particular to a high-precision high-pressure injection pump.

Background

The chromatographic analysis technology is widely applied to the fields of medicine and health, disease monitoring, livestock and poultry quarantine inspection and the like, and the sample injector is used as an important component of the chromatographic analysis device and is used for delivering a sample into a mobile phase of a high-pressure liquid flow or washing different components or switching among a plurality of separation systems. The existing sample injector has the problems of liquid leakage, liquid leakage or sample injection failure and the like due to unreasonable structure, poor sealing performance and the like.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problems and provides a high-precision high-pressure injection pump, which adopts the following technical scheme:

a high-precision high-pressure injection pump comprises a fixed frame, a fixed plate, a valve head, an injection mechanism and a sliding block, wherein the valve head is fixedly arranged on the fixed frame, a plurality of valve ports are formed in the valve head, the injection mechanism is communicated with one valve port, a rotating sheet is arranged on one side of the valve head, the rotating sheet is driven by a first motor and rotates relative to the valve head, and the flow path switching of the valve head is realized through rotation; fixed plate and injection mechanism parallel arrangement and with mount fixed connection, the slider with the fixed plate butt and along the reciprocal sliding of fixed plate, fixed connection installation pole on the slider, the installation pole runs through the fixed plate, the fixed connection piece that sets up of plunger rod tip, fixed connection piece cup joints on the installation pole, fixed connection piece sets up the elastic connection piece respectively along the both sides of installation pole axis direction.

On the basis of the scheme, the fixing frame is provided with the lead screw and the second motor, the lead screw is rotatably arranged on the fixing frame and is parallel to the injection mechanism, the sliding block is in threaded connection with the lead screw, and the second motor drives the lead screw to rotate through the belt conveying mechanism.

Preferably, a sliding positioning block is arranged on the sliding block, and a position sensor is arranged on the fixing frame and corresponds to the position of the sliding positioning block.

Preferably, the fixed plate is provided with a chute, the slide block is fixedly provided with an installation block, the installation block is clamped in the chute and slides relative to the chute, and the installation rod is fixedly connected to the installation block; the one side that the slider set up the installation piece and fixed plate butt.

On the basis of the scheme, the positioning blocks are arranged on the surfaces, provided with the mounting blocks, of the sliding blocks, and the positioning blocks are multiple in number and are respectively abutted to the fixing plates.

On the basis of above-mentioned scheme, the quantity of locating piece is 3, and is triangular distribution, and the locating piece includes 2 fixed positioning piece and 1 locating piece that floats, and the locating piece that floats can joint in the mounting hole of slider with sliding, and the butt floating spring between locating piece one end and the mounting hole bottom that floats.

Preferably, the injection mechanism comprises a plunger rod and an injection pump pipe, an end sealing ring is arranged on the inner side of the lower end of the injection pump pipe, and the inner ring of the end sealing ring is abutted to the outer side wall of the plunger rod.

The utility model has the beneficial effects that: the sliding block is provided with a plurality of positioning blocks, and surface contact is replaced by point contact, so that the machining precision and difficulty are reduced while the stability of the moving track of the sliding block is ensured; the floating positioning block and the elastic connecting block compensate or eliminate the shaking and other motion noises generated in the moving process of the sliding block, so that the stable movement of the plunger rod is kept, and the structural tightness of the sample injector is ensured.

Drawings

FIG. 1: the utility model has a schematic structure;

FIG. 2: another view structure diagram of the present invention;

FIG. 3: the utility model discloses a schematic diagram of a belt transmission mechanism mounting structure;

FIG. 4: the end part structure of the plunger rod is schematic;

FIG. 5: the utility model is a schematic structural diagram of a sliding block;

FIG. 6: the valve head and the injection mechanism are connected in a schematic view;

FIG. 7: the valve head and the injection mechanism of the utility model have structural section;

FIG. 8: the valve head structure of the utility model is shown schematically;

FIG. 9: the structure of the rotating sheet is schematically shown.

Detailed Description

The utility model is further illustrated by the following examples in conjunction with the accompanying drawings:

in the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, it is to be understood that the terms "center", "length", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

As shown in fig. 1 and 2, a high-precision high-pressure injection pump includes a fixing frame 12, a fixing plate 54, a valve head 21, an injection mechanism and a slider 61, wherein the valve head 21 is fixedly mounted on the fixing frame 12, a plurality of valve ports 22 are arranged on the valve head 21, the injection mechanism is communicated with one valve port 22, a rotary piece 41 is arranged on one side of the valve head 21, the rotary piece 41 is driven by a first motor 11 and rotates relative to the valve head 21, and the flow path switching of the valve head 21 is realized through the rotation. Specifically, as shown in fig. 6 to 9, the side of the valve head 21 close to the rotary plate 41 is provided with a plurality of communicating ports 23 respectively communicating with the valve ports 22, the side of the rotary plate 41 close to the valve head 21 is provided with a liquid passing channel 42, when the relative angles of the rotary plate 41 and the valve head 21 are different, the liquid passing channel 42 communicates with two different communicating ports 23, so that when the rotary plate 41 is driven by the first motor 11 to rotate, the valve ports connected with the injection mechanism communicate with different valve ports, and the liquid inlet and outlet at different valve ports can be completed through the reciprocating action of the plunger rod 71 of the injection mechanism in the injection pump pipe 81.

Fixed plate 54 and injection mechanism parallel arrangement and with mount 12 fixed connection, slider 61 and fixed plate 54 butt and along fixed plate 54 reciprocating sliding, fixed connection installation pole on the slider 61, the installation pole runs through fixed plate 54, as shown in fig. 4, plunger rod 71 end fixing sets up fixed connection piece 72, fixed connection piece 72 cup joints on the installation pole, for eliminating slider 61 and removing the rocking of the horizontal direction that the in-process caused plunger rod 71, fixed connection piece 72 sets up elastic connection piece 73 respectively along the both sides of installation pole axial direction, the rocking of plunger rod 71 is offset through the deformation of elastic connection piece 73, thereby guarantee the leakproofness between plunger rod 71 and injection pump pipe 81. Alternatively, the elastic connection block 73 is not necessarily made of an elastic material, but a material capable of achieving some elastic deformation in this structure.

As shown in fig. 3, a lead screw 53 and a second motor 51 are disposed on the fixing frame 12, the lead screw 53 is rotatably mounted on the fixing frame 12 and is parallel to the injection mechanism, a slider 61 is in threaded connection with the lead screw 53, and the second motor 51 drives the lead screw 53 to rotate through a belt transmission mechanism 52. The slide block 61 is provided with a slide positioning block 65, the fixing frame 12 is provided with a position sensor 56, and the position sensor 56 is arranged corresponding to the position of the slide positioning block 65. The position sensor 56 may be a photoelectric sensor, an infrared sensor, or another type of sensor. Alternatively, when the slide positioning block 65 is moved to the position sensor 56, the plunger rod 71 is moved to the top, the tapping is completed, and the position sensor 56 sends a signal to the control system indicating that the plunger rod 71 is returned to the start position. Because the pressure in the sample injector is high, the requirement on the precision of components in the moving process is high, in order to stabilize the movement track of the sliding block 61, the fixing frame 12 is fixedly provided with the fixing plate 54, the fixing plate 54 is provided with the strip-shaped sliding groove 55, as shown in fig. 5, the sliding block 61 is fixedly provided with the mounting block 64, the mounting block 64 is clamped in the sliding groove 55 and slides relative to the sliding groove 55, the mounting rod is fixedly connected to the mounting block 64, and the movement of the sliding block 61 is limited through the matching of the mounting block 64 and the sliding groove 55. At the same time, the surface of the slider 61 on which the mounting block 64 is provided abuts against the fixed plate 54 to restrict the horizontal position of the slider 61 when it moves. For reducing the requirement of butt in the face of machining precision and the degree of difficulty, slider 61 sets up the locating piece near fixed plate 54 one side, and the quantity of locating piece is a plurality of, and respectively with fixed plate 54 butt to the mode of multiple spot butt replaces the face contact, and for guaranteeing slider 61's position accuracy, a plurality of locating pieces should not be on same straight line simultaneously. Preferably, the quantity of locating piece is 3, and be triangular distribution, the locating piece includes 2 fixed positioning piece 62 and 1 locating piece 63 that floats, locating piece 63 that floats can joint in the mounting hole of slider 61 with sliding, and the butt floating spring between locating piece 63 one end that floats and the mounting hole bottom, locating piece 63 that floats can be under floating spring's effect, according to the processing flaw suitable adjustment position on fixed plate 54 surface, cooperation fixed positioning piece 62, it is stable, accurate to guarantee the position orbit of slider 61, and then guarantee that the action of plunger rod 71 is stable.

As shown in fig. 7, the injection mechanism includes a plunger rod 71 and an injection pump tube 81, an end seal 82 is provided inside the lower end of the injection pump tube 81, the inner ring of the end seal 82 is in contact with the outer side wall of the plunger rod 71, and the end seal 82 is held by the above structure, so that the sealing performance between the outer peripheral surface of the plunger rod 71 and the end seal 82 under a high pressure environment is ensured, instead of the conventional structure in which a seal is provided at the end of the plunger rod 71.

The present invention has been described above by way of example, but the present invention is not limited to the above-described specific embodiments, and any modification or variation made based on the present invention is within the scope of the present invention as claimed.

Claims

1. A high-precision high-pressure injection pump is characterized by comprising a fixed frame (12), a fixed plate (54), a valve head (21), an injection mechanism and a sliding block (61), wherein the valve head (21) is fixedly arranged on the fixed frame (12), the valve head (21) is provided with a plurality of valve ports (22), the injection mechanism is communicated with one valve port (22), one side of the valve head (21) is provided with a rotating sheet (41), the rotating sheet (41) is driven by a first motor (11) and rotates relative to the valve head (21), and the flow path switching of the valve head (21) is realized through rotation; fixed plate (54) and injection mechanism parallel arrangement and with mount (12) fixed connection, slider (61) and fixed plate (54) butt and along fixed plate (54) reciprocating sliding, fixed connection installation pole on slider (61), the installation pole runs through fixed plate (54), plunger rod (71) end fixing sets up fixed connection piece (72), fixed connection piece (72) cup joint on the installation pole, fixed connection piece (72) set up elastic connection piece (73) respectively along the both sides of installation pole axis direction.

2. A high precision high pressure injection pump according to claim 1, characterized in that the fixing frame (12) is provided with a lead screw (53) and a second motor (51), the lead screw (53) is rotatably installed on the fixing frame (12) and is parallel to the injection mechanism, the slide block (61) is in threaded connection with the lead screw (53), and the second motor (51) drives the lead screw (53) to rotate through a belt transmission mechanism (52).

3. A high-precision high-pressure injection pump according to claim 1, wherein a sliding positioning block (65) is provided on the sliding block (61), and a position sensor (56) is provided on the fixing frame (12), wherein the position sensor (56) is provided corresponding to the position of the sliding positioning block (65).

4. A high-precision high-pressure injection pump according to claim 1, wherein the fixing plate (54) is provided with a strip-shaped chute (55), the slide block (61) is fixedly provided with a mounting block (64), the mounting block (64) is clamped in the chute (55) and slides relative to the chute, and the mounting rod is fixedly connected to the mounting block (64); one surface of the slider (61) provided with the mounting block (64) is abutted against the fixed plate (54).

5. A high-precision high-pressure injection pump according to claim 4, characterized in that a plurality of positioning blocks are arranged on one surface of the slide block (61) provided with the mounting block (64) and are respectively abutted against the fixing plate (54).

6. A high accuracy high pressure syringe pump as claimed in claim 5, characterized in that, the number of the locating pieces is 3, and the locating pieces are distributed triangularly, the locating pieces include 2 fixed locating pieces (62) and 1 floating locating piece (63), the floating locating piece (63) can be slidingly clamped in the mounting hole of the slider (61), and a floating spring is abutted between one end of the floating locating piece (63) and the bottom of the mounting hole.

7. A high precision high pressure injection pump according to claim 1, characterized in that the injection mechanism comprises a plunger rod (71) and an injection pump tube (81), an end sealing ring (82) is arranged inside the lower end of the injection pump tube (81), and the inner ring of the end sealing ring (82) is abutted with the outer side wall of the plunger rod (71).