A double plunger high pressure infusion pump for liquid chromatograph

Abstract

The utility model relates to the technical field of infusion pumps, and specifically to a double-plunger high-pressure infusion pump for a liquid chromatograph, comprising a pump body, a transmission assembly and an infusion assembly; the transmission assembly comprises a motor, a transmission shaft, a fixing seat and a cam, the motor is fixedly connected to the pump body and is located on one side of the pump body, the fixing seat is fixedly connected to the pump body and is located on a side of the pump body away from the motor, one end of the transmission shaft is connected to the motor, and the other end is connected to the fixing seat, there are two cams, the two cams are respectively fixedly connected to the transmission shaft and are respectively located inside the pump body, and the infusion assembly is connected to the pump body, so as to solve the problem that when the axial multi-plunger pulse-free high-pressure infusion pump for a liquid chromatograph is used, the control of the plungers is relatively complicated, and when one of the plungers is damaged, the equipment cannot be used any more.

Description

Technical Field

[0001] The utility model relates to the technical field of infusion pumps, in particular to a double-plunger high-pressure infusion pump for a liquid chromatograph. Background Art

[0002] Large-scale production requires large-capacity chromatographic columns, which have a capacity hundreds of times that of experimental separation columns. Therefore, large-capacity infusion pumps are needed. Due to the large flow rate per unit time, a high flow rate of the mobile phase is inevitably required, and liquid pulses need to be avoided.

[0003] The existing announcement number CN208763832U discloses an axial multi-plunger pulse-free high-pressure infusion pump for a liquid chromatograph, including a pump body and a pump head. The pump head is an annular pump head, including a central rotating shaft, a turntable and multiple piston assemblies, and the multiple piston assemblies are dispersedly arranged on the turntable. Compared with the existing technology, this utility model is simple and feasible, and overcomes the shortcomings of the current double-pump head high-pressure infusion pump matching the laboratory scale, such as small flow rate and obvious pulse, and avoids the disorder of column packing that may be caused by mobile phase pulses.

[0004] However, when the above-mentioned axial multi-plunger pulse-free high-pressure infusion pump for liquid chromatograph is in use, the control of the plungers is relatively complicated. When one of the plungers is damaged, the device cannot be used any more. Utility Model Content

[0005] The purpose of the utility model is to provide a double-plunger high-pressure infusion pump for a liquid chromatograph, which solves the problem that the control of the plungers of an axial multi-plunger pulse-free high-pressure infusion pump for a liquid chromatograph is relatively complicated during use, and when one of the plungers is damaged, the equipment cannot be used any further.

[0006] To achieve the above-mentioned purpose, the utility model provides a double-plunger high-pressure infusion pump for a liquid chromatograph, comprising a pump body, a transmission assembly and an infusion assembly; the transmission assembly comprises a motor, a transmission shaft, a fixed seat and a cam, the motor is fixedly connected to the pump body and is located on one side of the pump body, the fixed seat is fixedly connected to the pump body and is located on a side of the pump body away from the motor, one end of the transmission shaft is connected to the motor, and the other end is connected to the fixed seat, there are two cams, the two cams are respectively fixedly connected to the transmission shaft and are respectively located inside the pump body, and the infusion assembly is connected to the pump body.

[0007] Wherein, two guide grooves, two connecting grooves and two infusion cavities are arranged inside the infusion pump.

[0008] Among them, the infusion assembly includes a guide seat, a connecting column and a plunger body. The number of the guide seats is two, and the two guide seats are respectively slidably connected to the pump body and are respectively located inside the guide groove. The number of the connecting columns is two, and the two connecting columns are respectively fixedly connected to the two guide seats and are respectively located inside the connecting groove. The number of the plunger bodies is two, and the two plunger bodies are respectively fixedly connected to the two connecting columns and are respectively located inside the infusion cavity.

[0009] Among them, the infusion component also includes a return spring and a sealing ring. The number of the return springs is four, and the four return springs are respectively fixedly connected to the two guide seats and are respectively located between the guide seats and the pump body. The number of the sealing rings is four, and the four sealing rings are respectively detachably connected to the plunger bodies and are respectively located at the upper and lower ends of the two plunger bodies.

[0010] Among them, the double-plunger high-pressure infusion pump for liquid chromatograph also includes a one-way valve, a liquid tank and a connector. The number of the one-way valves is four, and the four one-way valves are respectively fixedly connected to the pump body and are respectively located on both sides of the pump body. The number of the liquid tanks is two, and the two liquid tanks are respectively fixedly connected to the pump body and are respectively located on the outside of the one-way valve. Each liquid tank is fixedly connected to a connector on the side away from the pump body.

[0011] The utility model discloses a double-plunger high-pressure infusion pump for a liquid chromatograph, wherein the motor provides power for infusion, and the two cams are oppositely placed on the outside of the transmission shaft, and the transmission shaft is driven to rotate by the rotation of the motor, and the two cams are driven to rotate respectively, and the guide seats are driven to move downward along the direction of the guide groove respectively, so as to achieve pulse-free infusion of the liquid in the infusion cavity, and at the same time, the two cams respectively control a set of infusion components, and when one of the cams or the plunger body is damaged, the pump body can still operate, thus solving the problem that the control of the plunger of the axial multi-plunger pulse-free high-pressure infusion pump for a liquid chromatograph is relatively complicated when in use, and when one of the plungers is damaged, the device cannot be used any more. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0013] Figure 1 It is a schematic diagram of the overall structure of a double-plunger high-pressure infusion pump for a liquid chromatograph according to the first embodiment of the utility model.

[0014] Figure 2It is a structural schematic diagram of a transmission assembly of the first embodiment of the utility model.

[0015] Figure 3 It is a structural schematic diagram of the infusion assembly of the first embodiment of the utility model.

[0016] Figure 4 It is a cross-sectional schematic diagram of the pump body of the first embodiment of the utility model.

[0017] Figure 5 It is a schematic diagram of the overall structure of a double-plunger high-pressure infusion pump for a liquid chromatograph according to the second embodiment of the utility model.

[0018] Figure 6 It is a structural schematic diagram of a one-way valve, a liquid tank and a joint according to a second embodiment of the utility model.

[0019] In the figure: 101-pump body, 102-motor, 103-transmission shaft, 104-fixed seat, 105-cam, 106-guide groove, 107-connecting groove, 108-infusion cavity, 109-guide seat, 110-connecting column, 111-plunger body, 112-reset spring, 113-sealing ring, 201-check valve, 202-liquid tank, 203-connector. DETAILED DESCRIPTION

[0020] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0021] The first embodiment of the present application is:

[0022] See also Figures 1 to 4 ,in, Figure 1 This is a schematic diagram of the overall structure of a double-plunger high-pressure infusion pump for a liquid chromatograph according to the first embodiment of the utility model. Figure 2 is a schematic structural diagram of a transmission assembly of the first embodiment of the utility model, Figure 3 is a schematic structural diagram of an infusion assembly according to a first embodiment of the utility model, Figure 4It is a cross-sectional schematic diagram of the pump body of the first embodiment of the utility model. The utility model provides a double-plunger high-pressure infusion pump for a liquid chromatograph, including a pump body 101, a transmission assembly and an infusion assembly, the transmission assembly including a motor 102, a transmission shaft 103, a fixing seat 104 and a cam 105, and the infusion assembly including a guide seat 109, a connecting column 110, a plunger body 111, a reset spring 112 and a sealing ring 113; the aforementioned scheme solves the problem that the control of the plunger of the axial multi-plunger pulse-free high-pressure infusion pump for a liquid chromatograph is relatively complicated during use, and when one of the plungers is damaged, the device cannot be used any further. It can be understood that the aforementioned scheme can be used in the scenario of high-pressure infusion of a liquid chromatograph, and can also be used to solve the problem of cavity sealing during infusion.

[0023] According to the present specific embodiment, the motor 102 is fixedly connected to the pump body 101 and is located on one side of the pump body 101. The fixing seat 104 is fixedly connected to the pump body 101 and is located on a side of the pump body 101 away from the motor 102. One end of the transmission shaft 103 is connected to the motor 102, and the other end is connected to the fixing seat 104. There are two cams 105, and the two cams 105 are respectively fixedly connected to the transmission shaft 103 and are respectively located inside the pump body 101. The infusion assembly is connected to the pump body 101. The motor 102 provides power for infusion, and the two cams 105 are placed oppositely on the outside of the transmission shaft 103. The transmission shaft 103 is driven to rotate by the rotation of the motor 102, and the two cams 105 are driven to rotate at the same time, and the guide seat 109 is driven to move downward along the direction of the guide groove 106, so as to achieve pulse-free infusion of the liquid in the infusion cavity 108. At the same time, the two cams 105 respectively control a set of the infusion components. When one of the cams 105 or the plunger body 111 is damaged, the pump body 101 can still operate.

[0024] Among them, the interior of the infusion pump is provided with two guide grooves 106, two connecting grooves 107 and two infusion cavities 108, the guide groove 106 provides guidance and limiting functions for the guide seat 109, the connecting groove 107 is used to provide guidance and limiting functions for the connecting column 110, and the infusion cavity 108 provides a cavity for infusion.

[0025] Secondly, there are two guide seats 109, which are slidably connected to the pump body 101 and are respectively located inside the guide groove 106. There are two connecting posts 110, which are fixedly connected to the two guide seats 109 and are respectively located inside the connecting groove 107. There are two plunger bodies 111, which are fixedly connected to the two connecting posts 110 and are respectively located inside the infusion cavity 108. The rotation of the cam 105 drives the two guide seats 109 to move up and down respectively. When the plunger body 111 moves up, the liquid outside the pump body 101 is sucked into the infusion cavity 108, and then the plunger body 111 moves down to pressurize the liquid in the infusion cavity 108 and push it out of the infusion cavity 108, thereby achieving the purpose of pressurized infusion.

[0026] Again, the number of the return springs 112 is four, and the four return springs 112 are respectively fixedly connected to the two guide seats 109, and are respectively located between the guide seats 109 and the pump body 101. The number of the sealing rings 113 is four, and the four sealing rings 113 are respectively detachably connected to the plunger bodies 111, and are respectively located at the upper and lower ends of the two plunger bodies 111. The return spring 112 provides a return function for the guide seat 109, and the sealing ring 113 seals the gap between the plunger body 111 and the inner wall of the infusion cavity 108.

[0027] A double-plunger high-pressure infusion pump for a liquid chromatograph according to the present embodiment is used, wherein the motor 102 provides power for infusion, and the two cams 105 are oppositely placed on the outside of the transmission shaft 103. The rotation of the motor 102 drives the transmission shaft 103 to rotate, and at the same time drives the two cams 105 to rotate respectively, and drives the guide seat 109 to move downward along the direction of the guide groove 106 respectively, so as to achieve pulse-free infusion of the liquid in the infusion cavity 108. At the same time, the two cams 105 respectively control a set of infusion components. When one of the cams 105 or the plunger body 111 is damaged, the pump body 101 can still operate, thereby solving the problem that the control of the plunger of the axial multi-plunger pulse-free high-pressure infusion pump for a liquid chromatograph is relatively complicated when in use, and the problem that the device cannot be used when one of the plungers is damaged is solved.

[0028] The second embodiment of the present application is:

[0029] Based on the first embodiment, please refer to Figure 5 and Figure 6 ,in, Figure 5 This is a schematic diagram of the overall structure of a double-plunger high-pressure infusion pump for a liquid chromatograph according to the second embodiment of the utility model. Figure 6 It is a structural schematic diagram of a one-way valve, a liquid tank and a joint according to a second embodiment of the utility model.

[0030] The double-plunger high-pressure infusion pump for liquid chromatograph of this embodiment further includes a one-way valve 201 , a liquid tank 202 and a connector 203 .

[0031] With respect to this specific embodiment, the number of the one-way valves 201 is four, and the four one-way valves 201 are fixedly connected to the pump body 101, and are respectively located on both sides of the pump body 101. The number of the liquid tanks 202 is two, and the two liquid tanks 202 are fixedly connected to the pump body 101, and are respectively located on the outside of the one-way valves 201. A connector 203 is fixedly connected to a side of each liquid tank 202 away from the pump body 101. The pressure in the infusion cavity 108 changes, and the liquid is sucked into the infusion cavity 108 through the one-way valve 201 or is pressurized and pushed out of the infusion cavity 108. The liquid tank 202 provides a buffering effect for the liquid during the infusion of the device, and the connector 203 facilitates the connection of the device with the outside world.

[0032] A double-plunger high-pressure infusion pump for a liquid chromatograph according to the present embodiment is used. The pressure in the infusion chamber 108 changes, and the liquid is sucked into the infusion chamber 108 through the one-way valve 201 or is pushed out of the infusion chamber 108 under pressure. The liquid tank 202 provides a buffering effect for the liquid during the infusion of the device, and the connector 203 facilitates the connection of the device to the outside world.

[0033] What is disclosed above is only one or more preferred embodiments of the present application, and cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiments and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A double-plunger high-pressure infusion pump for a liquid chromatograph, comprising a pump body, characterized in that: Also includes a transmission component and an infusion component; The transmission assembly includes a motor, a transmission shaft, a fixed seat and a cam. The motor is fixedly connected to the pump body and is located on one side of the pump body. The fixed seat is fixedly connected to the pump body and is located on a side of the pump body away from the motor. One end of the transmission shaft is connected to the motor, and the other end is connected to the fixed seat. There are two cams, and the two cams are respectively fixedly connected to the transmission shaft and are respectively located inside the pump body. The infusion assembly includes a guide seat, a connecting column and a plunger body. There are two guide seats, and the two guide seats are respectively slidably connected to the pump body and are respectively located inside the guide groove. There are two connecting columns, and the two connecting columns are respectively fixedly connected to the two guide seats and are respectively located inside the connecting groove. There are two plunger bodies, and the two plunger bodies are respectively fixedly connected to the two connecting columns and are respectively located inside the infusion cavity.

2. A double-plunger high-pressure infusion pump for liquid chromatograph according to claim 1, characterized in that: Two guide grooves, two connecting grooves and two infusion cavities are arranged inside the pump body.

3. A double-plunger high-pressure infusion pump for liquid chromatograph according to claim 1, characterized in that: The infusion assembly also includes a return spring and a sealing ring. There are four return springs, which are fixedly connected to the two guide seats and located between the guide seats and the pump body respectively. There are four sealing rings, which are detachably connected to the plunger bodies and located at the upper and lower ends of the two plunger bodies respectively.

4. A double-plunger high-pressure infusion pump for liquid chromatograph according to claim 1, characterized in that: The double-plunger high-pressure infusion pump for liquid chromatograph also includes a one-way valve, a liquid tank and a connector. There are four one-way valves, which are fixedly connected to the pump body and located on both sides of the pump body. There are two liquid tanks, which are fixedly connected to the pump body and located on the outside of the one-way valve. Each liquid tank is fixedly connected to a connector on one side away from the pump body.

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