Injection pump

Abstract

The utility model belongs to the field of fluid transfer, and discloses an injection pump which comprises a valve body, a valve element, a cylinder body and a piston assembly. The valve element is movably arranged in a cavity of the valve body, an inlet, an outlet and a third opening which are communicated with the cavity are formed in the valve body, the valve element is switched between a first position and a second position, when the valve element is located at the first position, the inlet is communicated with the third opening, and when the valve element is located at the second position, the outlet is communicated with the third opening; the third opening is detachably connected with the cylinder body, and the piston assembly penetrates through the valve body from the side where the valve body is located and then penetrates into the cylinder body so as to be in sliding fit with the cylinder body. According to the utility model, the purpose of easy disassembly can be achieved, thereby realizing convenient cleaning and facilitating replacement and maintenance of accessories.

Description

Technical Field

[0001] This utility model belongs to the field of fluid transport, and in particular relates to an injection pump. Background Technology

[0002] In the transportation of some fluid materials, it is necessary to quantitatively control the output of fluid in certain scenarios. Therefore, with the development of technology, some manufacturers have designed and manufactured injection pumps. Through intelligent control, accurate quantitative output of fluid can be achieved. Although the current injection pumps have a high degree of integration, there are still problems such as difficulty in disassembly and inconvenience in cleaning. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model discloses an injection pump that is easy to disassemble, thereby facilitating cleaning and replacement and maintenance of parts.

[0004] The specific technical solution of this utility model is as follows:

[0005] An injection pump includes a valve body, a valve core, a cylinder, and a piston assembly;

[0006] The valve core is movably disposed within the cavity of the valve body. The valve body is provided with an inlet, an outlet, and a third port communicating with the cavity. The valve core switches between position one and position two. When the valve core is in position one, the inlet and the third port are connected. When the valve core is in position two, the outlet and the third port are connected.

[0007] The cylinder is detachably connected to the third port, and the piston assembly passes through the valve body from the side where the valve body is located and then enters the cylinder to slide with the cylinder.

[0008] In existing technologies, piston assemblies typically extend into the cylinder from the end furthest from the valve body. Fluid is drawn in and discharged through the axial movement of the piston assembly within the cylinder, thus satisfying the quantitative delivery of fluid. While this structure is relatively compact, it creates difficulties for cleaning and replacing components such as the cylinder. In other words, if periodic maintenance of components is required, the corresponding parts of the piston assembly must be disassembled first before the cylinder can be disassembled and maintained. This significantly prolongs downtime and is detrimental to process progress. Therefore, this application connects the cylinder separately to one end of the valve body, allowing for direct disassembly of the cylinder for periodic maintenance, while simultaneously maintaining the piston assembly. This approach is convenient and practical.

[0009] Preferably, the valve core has a power source for driving its rotation or translation, the fixing part of the power source is detachably connected to the valve body on the side away from the third port, the driving part of the power source is connected to the valve core, and the piston assembly passes through the driving part of the power source.

[0010] This structure improves the compactness of the injection pump in this application.

[0011] Preferably, the power source drives the valve core to rotate, and the drive unit of the power source and the valve core are connected by multiple pins.

[0012] This structure saves on assembly processes, as the fit can be completed by directly aligning the pin with its mating pin hole, thus enabling the valve core to rotate once the power source is started.

[0013] Preferably, a bearing is provided between the valve core and the valve body.

[0014] This structure is reliable and can effectively ensure the rotation efficiency of the valve core.

[0015] Preferably, the piston assembly includes a piston rod and a piston, wherein the piston rod passes through the valve body from the side where the valve body is located and then enters the cylinder body to slide in cooperation with the cylinder body;

[0016] The piston and piston rod are detachably connected.

[0017] This structure facilitates the assembly and disassembly of the piston and the overall structure.

[0018] Preferably, the piston assembly further includes an extension rod, one end of which is detachably connected to the piston and the other end of which is detachably connected to the piston rod.

[0019] This structure ensures that the piston has sufficient displacement path, thus allowing for quick matching with cylinders of different volumes.

[0020] Preferably, a universal joint is provided between the piston and the piston rod.

[0021] The universal joint ensures the smooth movement of the piston, thereby guaranteeing the stability of fluid suction and discharge within the cylinder.

[0022] Preferably, a seal is provided between the piston assembly and the cylinder, and / or between the cylinder and the valve core, and / or between the valve core and the valve body, and / or between the piston assembly and the valve core.

[0023] The seal effectively prevents fluid leakage.

[0024] Compared with the prior art, this utility model can achieve convenient and quick disassembly of the cylinder block without replacing the corresponding parts of the piston assembly during the disassembly process. Therefore, it can well meet the requirements of timely cleaning of cylinder blocks and other accessories, and can provide convenience for maintenance and replacement of parts. Attached Figure Description

[0025] Figure 1 This is a cross-sectional view of one embodiment of the present utility model;

[0026] Figure 2 for Figure 1 A cross-sectional view from another direction;

[0027] Figure 3 This is another cross-sectional view of an embodiment of the present utility model;

[0028] Figure 4 This is a schematic diagram of the valve body in an embodiment of the present utility model;

[0029] Figure 5 This is a schematic diagram of the valve core in an embodiment of this utility model;

[0030] Figure 6 This is a schematic diagram of valve core control according to another embodiment of the present invention;

[0031] Figure 7 This is a schematic diagram of valve core control according to another embodiment of the present invention.

[0032] In the diagram: 1-Valve body; 2-Valve core; 3-Cylinder body; 4-Inlet; 5-Outlet; 6-Third port; 7-Piston rod; 8-Piston; 9-Cavity 1; 10-Cavity 2; 11-Power source 1; 12-Pin; 13-Extension rod; 14-Power source 2; 15-Universal joint; 16-Seal; 17-Port 1; 18-Port 2; 19-Feed pipe; 20-Discharge pipe; 21-Baffle; 22-Inclined surface 1; 23-Contact part. Detailed Implementation

[0033] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to specific embodiments.

[0034] like Figures 1-5 As shown, an injection pump includes a valve body 1, a valve core 2, a cylinder 3, and a piston 8 assembly. The valve core 2 is movably disposed within the chamber of the valve body 1. The valve body 1 is provided with an inlet 4, an outlet 5, and a third port 6 communicating with the chamber. The valve core 2 switches between a first position and a second position. When the valve core 2 is in the first position, the inlet 4 is connected to the third port 6. When the valve core 2 is in the second position, the outlet 5 is connected to the third port 6. The cylinder 3 is detachably connected to the third port 6. The piston 8 assembly passes through the valve body 1 from the side where the valve body 1 is located and then enters the cylinder 3 to slide in cooperation with the cylinder 3.

[0035] In this embodiment, the piston 8 assembly includes a piston rod 7 and a piston 8. The piston rod 7 passes through the valve body 1 from the side where the valve body 1 is located and then enters the cylinder 3 to slide in cooperation with the cylinder 3. Figures 1-5As shown, the cylinder 3 is divided into chamber 9 and chamber 10 by piston 8. Chamber 10 is connected to the third port 6 of valve core 2. When valve core 2 is in position 1, with inlet 4 connected to the third port 6, as piston 8 moves to the left, the volume of chamber 9 gradually decreases, and the volume of chamber 10 gradually increases, achieving suction. At this time, fluid enters valve core 2 through inlet 4 and then enters chamber 10. Maintaining this state allows fluid to remain in the injection pump. Then, valve core 2 can be moved to position 2, where outlet 5 and the third port 6 are connected. Therefore, when piston 8 moves to the right, the volume of chamber 9 gradually increases, and the volume of chamber 10 gradually decreases, achieving discharge. At this time, fluid enters valve core 2 from chamber 10 and exits the injection pump from outlet 5, thus achieving quantitative fluid transfer. During the above process, when the valve core 2 moves between position one and position two, the volume of the fluid space in the injection pump remains unchanged. In other words, there is no fluid leakage during this process, thus maintaining a metering level.

[0036] As is known, in existing technologies, traditional syringe pumps typically connect the drive mechanism to the pump body. When cleaning or maintaining the pump body, it is usually necessary to disassemble the drive mechanism and other components first, which is cumbersome and inefficient. However, this embodiment allows for quick disassembly. In this embodiment, the valve body 1 and cylinder 3 are directly connected, eliminating the need to disassemble the piston 8 assembly. Therefore, maintenance is very convenient. Furthermore, since the piston 8 and piston rod 7 are detachably connected in this embodiment, the piston 8 can also be disassembled after removing the cylinder 3, allowing for convenient maintenance of the piston 8 without affecting the cleaning of the valve core 2.

[0037] In this embodiment, the valve core 2 has a power source 11 for driving its rotation. The fixing part of the power source 11 is detachably connected to the side of the valve body 1 away from the third port 6. The driving part of the power source 11 is connected to the valve core 2, and the piston 8 assembly passes through the driving part of the power source 11. Furthermore, in this embodiment, the driving part of the power source 11 and the valve core 2 are connected by multiple pins 12. Further, this embodiment also includes an extension rod 13, one end of which is detachably connected to the piston 8, and the other end is detachably connected to the piston rod 7. It is understood that the piston 8 assembly can be driven by a second power source 14 such as an air pump, electric push rod, or hydraulic cylinder. Although the extension rod 13 increases the distance between the second power source 14 and the cylinder 3, it correspondingly extends the stroke of the piston 8, thus ensuring the stability of fluid suction and discharge, and can be matched with cylinders 3 of different capacities, thereby expanding the application range of the injection pump. During assembly, the fixing part of the power source 11 is connected to the side of the valve body 1 away from the third port 6. Then, the pin 12 is installed on the drive part of the power source 11. Next, the valve core 2 is placed into the valve body 1 and aligned with the pin 12. It should be noted that the fixing part of the power source 11 is the main body connected to the valve body 1. Its drive part is rotatably mounted on the fixing part. The shaft of the drive part has a through hole for the piston rod 7 to pass through. The through hole of the shaft of the drive part is rotatably engaged with the piston rod 7. A gear can be set on the outer periphery of the drive part to drive the drive part to rotate through the drive source.

[0038] In this embodiment, the extension rod 13 is detachably connected to the piston 8, and also detachably connected to the piston rod 7. Therefore, after the above assembly process is completed, the extension rod 13 can be passed through the drive unit of the power source 11, then the valve core 2 can be aligned with the extension rod 13 and the pin 12, and then inserted into the valve body 1. The piston 8 and the extension rod 13 can then be connected, thus completing the installation of this part. Finally, the cylinder 3 and the valve body 1 are connected at the piston 8, and the extension rod 13 and the piston rod 7 are connected away from the piston 8. It is understood that the above assembly process is only one relatively convenient assembly method, and the actual assembly is not limited to the above steps. In other embodiments, the valve core 2 is a device sealed inside the valve body 1. Therefore, a gear mechanism or belt mechanism can be set in the valve body 1 to drive the valve core 2 to rotate. For example, a motor can be set inside the valve body 1, with a gear one at the motor's driving end and a gear two meshing with the gear one on the valve core 2. Thus, when the motor starts, it can drive the rotation of the valve core 2.

[0039] In this embodiment, a stepped portion one is provided on the outer periphery of the valve core 2, and a stepped portion two is provided on the inner side of the valve body 1. A bearing is provided between the stepped portion one and the stepped portion two. The stepped portion one and the stepped portion two can axially limit the bearing, thereby supporting the valve core 2 while effectively improving the rotational efficiency of the valve core 2.

[0040] To ensure the smooth movement of the piston 8, a universal joint 15 is provided between the piston rod 7 and the piston 8. It should be noted that in this embodiment, when an extension rod 13 is provided, the universal joint 15 is located between the extension rod 13 and the piston 8. If the movement of the piston rod 7 is not perfectly straight, the universal joint 15 ensures the smooth movement of the piston 8, preventing insufficient levelness from affecting the efficiency of the injection pump.

[0041] In this embodiment, a seal 16 is provided between the piston 8 assembly and the cylinder 3, and / or between the cylinder 3 and the valve core 2, and / or between the valve core 2 and the valve body 1, and / or between the piston 8 assembly and the valve core 2. Specifically, as shown... Figure 1 As shown, in this embodiment, a sealing element 16 is provided on the circumferential contact surface between the piston 8 and the cylinder 3, the end face contact surface between the cylinder 3 and the valve core 2, the circumferential contact surface between the valve core 2 and the valve body 1, and the circumferential contact surface between the piston rod 7 and the valve core 2.

[0042] It should be noted that in this embodiment, the valve core 2 has a first port 17 and a second port 18. The first port 17 cooperates with the third port 6 to maintain communication with the cylinder body 3. The first port 17 is used to connect to the inlet 4 or the opening when the valve core 2 switches between position one and position two. This realizes the valve movement control of the valve core 2. In addition, it is known that, besides driving the valve core 2 to rotate by a mechanical structure as described above, it can also be achieved by electromagnetic means, which will not be elaborated here.

[0043] In this embodiment, the inlet 4 of the valve body 1 is connected to an inlet pipe 19, and the outlet 5 is connected to an outlet pipe 20. The inlet pipe 19 and the outlet pipe 20 are configured to provide a preset flow path for the fluid, so that the injection pump can effectively transfer fluid and facilitate use.

[0044] In other embodiments, the valve core 2 has a power source 11 for driving its translational motion. For example... Figure 6 and Figure 7As shown, a movable valve core 2 is provided on the piston rod 7. The valve core 2 is a rod-shaped structure with baffles 21 at both ends. The baffles 21 have inclined surfaces 22. A contact part 23 that cooperates with the inclined surfaces 22 is provided on the valve body 1. Therefore, during the up and down movement of the piston rod 7, the translation rod is translated by the cooperation of the inclined surfaces 22 and the contact part 23 on the same side, thereby realizing the connection between the inlet 4 and the outlet 5 to the third port 6 at different times, thus realizing valve movement control.

[0045] The above are merely preferred embodiments of this utility model. It should be noted that the above preferred embodiments should not be considered as limitations on this utility model, and the scope of protection of this utility model should be determined by the scope defined in the claims. For those skilled in the art, several improvements and modifications can be made without departing from the spirit and scope of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. An injection pump, characterized in that, This includes the valve body, valve core, cylinder, and piston assembly; The valve core is movably disposed within the cavity of the valve body. The valve body is provided with an inlet, an outlet, and a third port communicating with the cavity. The valve core switches between position one and position two. When the valve core is in position one, the inlet and the third port are connected. When the valve core is in position two, the outlet and the third port are connected. The cylinder is detachably connected to the third port, and the piston assembly passes through the valve body from the side where the valve body is located and then enters the cylinder to slide with the cylinder.

2. The syringe pump as described in claim 1, characterized in that, The valve core has a power source for driving its rotation or translation. The fixed part of the power source is detachably connected to the valve body on the side away from the third port. The drive part of the power source is connected to the valve core, and the piston assembly passes through the drive part of the power source.

3. The syringe pump as described in claim 2, characterized in that, The power source drives the valve core to rotate, and the drive unit of the power source and the valve core are connected by multiple pins.

4. The syringe pump as described in claim 3, characterized in that, A bearing is provided between the valve core and the valve body.

5. The syringe pump as described in claim 1, characterized in that, The piston assembly includes a piston rod and a piston. The piston rod passes through the valve body from the side where the valve body is located and then enters the cylinder body to slide with the cylinder body. The piston and piston rod are detachably connected.

6. The syringe pump as described in claim 5, characterized in that, The piston assembly also includes an extension rod, one end of which is detachably connected to the piston and the other end of which is detachably connected to the piston rod.

7. An injection pump as described in claim 5, characterized in that, A universal joint is provided between the piston and the piston rod.

8. The syringe pump as described in claim 1, characterized in that, A seal is provided between the piston assembly and the cylinder, and / or between the cylinder and the valve core, and / or between the valve core and the valve body, and / or between the piston assembly and the valve core.

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