Fluid transport device

Abstract

This application discloses a fluid conveying device, including a support frame with a through groove, a drive mechanism on the support frame, and at least two sets of conveying mechanisms arranged in parallel. The through groove contains eccentric mechanisms corresponding to the conveying mechanisms, and the drive mechanism drives the eccentric mechanisms to rotate synchronously. Each conveying mechanism includes a pump head with a cavity and a piston disposed within the cavity. A connecting portion connects each conveying mechanism to the eccentric mechanism, and the connecting portion is rotatably connected to the conveying mechanism. This application integrates the drive mechanism and the at least two parallel conveying mechanisms onto the support frame, which has a through groove for accommodating the eccentric mechanisms and connecting portions. By integrating all components onto the support frame, the overall volume and space occupied are reduced, while simultaneously achieving a large conveying flow rate and reducing pulses.

Description

Technical Field

[0001] This application relates to the field of liquid chromatography technology, specifically to a fluid delivery device. Background Technology

[0002] A liquid chromatograph (LC) is an instrument that separates a mixture by utilizing the difference in the partition ratio between a liquid and a solid or between two immiscible liquids, and then analyzes and identifies the mixture. An LC consists of a high-pressure pump, an injection system, a temperature control system, a chromatographic column, a detector, and a signal recording system.

[0003] Existing sample delivery devices typically use a single plunger pump to deliver solvent. However, when a single plunger pump is working, the reciprocating motion of the plunger and the periodic opening and closing of the valve cause the output flow rate and pressure to exhibit periodic pulse phenomena. Excessive pulses can affect system performance and equipment lifespan, and the flow rate delivered is small. On the other hand, using a multi-plunger pump would increase the overall size and occupy more space. Utility Model Content

[0004] To address the aforementioned problems, this application provides a fluid conveying device with a compact overall structure, small size and footprint, large conveying flow rate and low pulse intensity, employing the following technical solution: A fluid conveying device includes a support frame with a through groove, a drive mechanism on the support frame, and at least two sets of conveying mechanisms arranged in parallel. The through groove is provided with eccentric mechanisms corresponding to the conveying mechanism, and the driving mechanism is used to drive the eccentric mechanisms to rotate synchronously. The conveying mechanism includes a pump head with a cavity and a piston disposed within the cavity; The conveying mechanism and the eccentric mechanism are both connected by a connecting part, and the connecting part is rotatably connected to the conveying mechanism.

[0005] Preferably, the eccentric mechanism includes an eccentric shaft rotatably connected to the support frame, and a rotating component sleeved on the outside of the eccentric shaft, with the connecting portion sleeved on the outside of the rotating component.

[0006] More preferably, the rotating component is a bearing.

[0007] More preferably, the eccentric shaft includes a rotating shaft and an eccentric block, the eccentric block being detachably connected to the rotating shaft.

[0008] Preferably, the pump head is provided with an inlet hole and an outlet hole that communicate with the cavity, and a connecting pipe is provided between the inlet hole and the outlet hole in parallel.

[0009] Preferably, both the inlet and outlet are provided with check valves to restrict the flow direction of the medium.

[0010] Preferably, the driving mechanism includes a driving component, which is integrated on one side of the support frame via a mounting plate, and the driving component is connected to the eccentric mechanism for transmission.

[0011] Preferably, it also includes a detection component located on the support frame for detecting the rotational speed of the eccentric mechanism.

[0012] The beneficial effects of this application are as follows: This application integrates the drive mechanism and at least two conveying mechanisms arranged side by side onto a support frame. The support frame is provided with a through slot for placing the eccentric mechanism and the connecting part. By integrating the components onto the support frame, the overall volume and space occupied can be reduced, while the conveying flow rate is large and the pulse can be reduced. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of this application; Figure 2 This is a partial structural diagram of this application; Figure 3 This is a schematic diagram of the eccentric structure of this application; Figure 4 This is a cross-sectional view of this application; Figure 5 This is a schematic diagram of the transport path in this application.

[0014] In the picture: 1. Shell; 2. Support frame; 20. Through groove; 3. Conveying mechanism, 3A. First conveying mechanism, 3B. Second conveying mechanism, 31. Pump head, 32. Piston, 310. Chamber, 33. Liquid inlet, 34. Liquid outlet, 35. First three-way valve, 36. Second three-way valve, 37. First check valve, 38. Second check valve; 4. Eccentric mechanism; 41. Eccentric shaft; 411. Rotating shaft; 412. Eccentric block; 42. Rotating component; 5. Drive mechanism; 51. Drive component; 52. Mounting plate; 6. Connecting part; 7. Control motherboard; 8. Power board; 9. Touch panel. Detailed Implementation

[0015] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described in this application are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0016] See Figures 1 to 5 To further elaborate on this application: Combination Figure 2 A fluid conveying device includes a support frame 2 with a through groove 20, a drive mechanism 5 on the support frame 2, and at least two sets of conveying mechanisms 3, a control main board 7, and a power board 8 arranged in parallel. In this embodiment, the conveying mechanism 3 includes a first conveying mechanism 3A and a second conveying mechanism 3B, which are arranged side by side to further reduce the space occupied. The through groove 20 is provided with eccentric mechanisms 4 corresponding to the conveying mechanisms 3, and the drive mechanism 5 is used to drive the eccentric mechanisms 4 to rotate synchronously. The conveying mechanism 3 includes a pump head 31 with a cavity 310 and a piston 32 disposed in the cavity 310. The conveying mechanism 3 and the eccentric mechanism 4 are connected by a connecting part 6, which is rotatably connected to the conveying mechanism 3. By integrating all components onto the support frame 2, the overall space occupied is reduced through this arrangement. The phase difference between the at least two sets of conveying mechanisms 3 arranged in parallel ( Figure 4 The phase difference between the two sets of conveying mechanisms 3 is 180°, which can partially cancel out pulses, reduce the occurrence of pulse phenomena, and thus improve service life.

[0017] Combination Figure 3 and Figure 4 In this embodiment, the eccentric mechanism 4 includes an eccentric shaft 41 rotatably connected to the support frame 2, and a rotating component 42 sleeved on the outside of the eccentric shaft 41. The connecting part 6 is sleeved on the outside of the rotating component 42. The eccentric shaft 41 includes a rotating shaft 411 and an eccentric block 412, which is detachably connected to the rotating shaft 411. This facilitates disassembly and replacement, and allows for the replacement of different eccentric blocks 412 as needed to adjust the working stroke L of the piston 32. This simplifies replacement and maintenance, reducing costs. The rotating component 42 can be a bearing. In some embodiments, the rotating component 42 can also be a bushing, etc.

[0018] In one embodiment, the eccentric block 412 is provided with a through hole along the axial direction for placing the rotating shaft 411; the rotating shaft 411 and the side of the eccentric block 412 may be provided with corresponding limiting holes, and a pin is inserted into the limiting hole to achieve disassembly and connection.

[0019] Combination Figure 4 and Figure 5The pump head 31 is provided with an inlet hole 33 and an outlet hole 34 communicating with the cavity 310. A connecting pipe is provided in parallel between the inlet hole 33 and the outlet hole 34. Both the inlet hole 33 and the outlet hole 34 are also provided with check valve components to restrict the flow direction of the medium. The check valve components include a first one-way valve 37 located at the inlet hole 33 and a second one-way valve 38 located at the outlet hole 34. The first one-way valve 37 prevents the conveying mechanism 3 from backflowing the solution in the cavity 310 through the inlet hole 33, and the second one-way valve 38 prevents the conveying mechanism 3 from sucking the solution discharged through the outlet hole 34 back into the cavity 310. An inlet pipe is provided between the inlet holes 33 to connect to any two ports of a first three-way valve 35, and an outlet pipe is provided between the outlet holes 34 to connect to any two ports of a second three-way valve 36.

[0020] During operation, the solvent is drawn in and sequentially enters the cavity 310 through the first three-way valve 35, the inlet pipe, the first one-way valve 37, and the inlet hole 33. After being compressed by the piston 32, it is delivered out through the outlet hole 34, the second one-way valve 38, and the second three-way valve 36.

[0021] Combination Figure 4 The drive mechanism 5 includes a drive component 51, which is integrated into one side of the support frame 2 via a mounting plate 52. The drive component 51 is connected to the eccentric mechanism 4 via a transmission connection. The drive component 51 is a motor, and each eccentric shaft 41 has a driven component. The drive shaft of the motor has a driving component, and a transmission component connects the driving component and the driven component. The driving component and the driven component can be synchronous pulleys, and the transmission component can be a synchronous belt. A single motor can drive the conveying mechanism 3 synchronously, reducing costs; alternatively, the conveying mechanism 3 can be driven by independent motors.

[0022] In some embodiments, a detection component located on the support frame 2 is further included for detecting the rotational speed of the eccentric mechanism 4. The detection component includes a counting sensor and a baffle disposed on the eccentric shaft 41. The counting sensor detects the rotational speed of the eccentric shaft 41 through the baffle. The volume of solvent discharged by the conveying mechanism 3 in one revolution of the eccentric shaft 41 is a constant value. By controlling the rotational speed of the eccentric shaft 41, the conveying volume can be precisely controlled.

[0023] Combination Figure 1In some embodiments, the device also includes a housing 1 for housing the support frame 2 and providing protection. The housing is equipped with a touch panel 9. The touch panel 9, the conveying mechanism 3, the driving mechanism 5, the power board 8, and the control main board 7 are electrically connected. The housing 1 is equipped with a handheld component for moving the entire conveying device.

[0024] The fluid transport device described in this application is also applicable to fluid transport in the petrochemical field.

Claims

1. Fluid delivery device, characterized in that: It includes a support frame with a through groove, a drive mechanism on the support frame, and at least two sets of conveying mechanisms arranged in parallel; The through groove is provided with eccentric mechanisms corresponding to the conveying mechanism, and the driving mechanism is used to drive the eccentric mechanisms to rotate synchronously. The conveying mechanism includes a pump head with a cavity and a piston disposed within the cavity; The conveying mechanism and the eccentric mechanism are both connected by a connecting part, and the connecting part is rotatably connected to the conveying mechanism.

2. The fluid delivery device of claim 1, wherein: The eccentric mechanism includes an eccentric shaft rotatably connected to the support frame, and a rotating component sleeved on the outside of the eccentric shaft, with the connecting part sleeved on the outside of the rotating component.

3. The fluid delivery device of claim 2, wherein: The rotating component is a bearing.

4. The fluid delivery device of claim 2, wherein: The eccentric shaft includes a rotating shaft and an eccentric block, and the eccentric block is detachably connected to the rotating shaft.

5. The fluid delivery device of claim 1, wherein: The pump head is provided with an inlet hole and an outlet hole that connect to the cavity, and a connecting pipe is provided between the inlet hole and the outlet hole in parallel.

6. The fluid delivery device of claim 5, wherein: Both the inlet and outlet are equipped with check valves to restrict the flow direction of the medium.

7. The fluid delivery device of claim 1, wherein: The drive mechanism includes a drive component, which is integrated on one side of the support frame via a mounting plate. The drive component is connected to the eccentric mechanism for transmission.

8. The fluid delivery device of claim 1, wherein: It also includes a detection component located on the support frame for detecting the rotational speed of the eccentric mechanism.

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