High-pressure pump with long service life and self-cleaning structure

Abstract

The utility model belongs to high pressure pump technical field, specifically provide a long life self -cleaning structure's high pressure pump, including high pressure pump body, high pressure pump body includes plunger, cleaning cavity seat and drive assembly, plunger sliding installation is in the cleaning cavity seat, drive assembly is located below the cleaning cavity seat, and with the bottom fixed connection of plunger, the both sides of cleaning cavity seat are equipped with liquid inlet and liquid outlet respectively, and the flexible import umbrella valve and export umbrella valve are equipped in liquid inlet and liquid outlet respectively, the bottom of cleaning cavity seat is equipped with flexible pump liquid diaphragm, pump liquid diaphragm is sleeved in the outside of plunger, and with drive assembly sealed connection, when pump liquid diaphragm is in the stretching state, import umbrella valve is opened, when pump liquid diaphragm is in the contraction state, export umbrella valve is opened. The utility model discloses through the setting of import umbrella valve, export umbrella valve and pump liquid diaphragm, can form the pressure difference in the cleaning cavity seat in the plunger suction and discharge liquid process, under the action of pressure difference makes the cleaning fluid to be pumped in and pumped out, to realize the cleaning of plunger.

Description

Technical Field

[0001] This utility model relates to the field of high-pressure pump technology, and specifically to a high-pressure pump with a long-life self-cleaning structure. Background Technology

[0002] High-pressure constant-flow pumps are commonly used in chromatographic instruments, primarily to provide a stable, constant-flow liquid state in the liquid circuit system. However, prolonged operation of the high-pressure pump can lead to liquid leakage and the presence of liquid carried outside the high-pressure chamber by the plunger. This leakage causes the cleaning solution to crystallize, forming salt particles. These salt crystals continuously interact with the high-pressure plug seal, damaging it.

[0003] The current mainstream method to extend service life is to add an active cleaning system to the hydraulic system and to add a plug seal within the plunger's stroke of the high-pressure pump to seal the cleaning fluid path and reduce damage to the high-pressure plug seal.

[0004] The current approach has two drawbacks: Firstly, even with water rinsing, the seals of the cleaning chamber will wear down during the continuous operation of the plunger. Once the wear causes liquid leakage, the transmission mechanism will rust and become stuck, leading to a direct shutdown. Furthermore, the seals of the cleaning chamber also require regular maintenance and replacement, causing inconvenience in use. Secondly, a separate active cleaning system needs to be added to the hydraulic system. From the electrical control to the hydraulic circuit, additional components are required, which also increases the risk of using these additional components. Utility Model Content

[0005] To address the technical problems in the prior art, this utility model provides a high-pressure pump with a long-life self-cleaning structure, including a high-pressure pump body. The high-pressure pump body includes a plunger, a cleaning chamber seat, and a drive assembly. The plunger is slidably installed in the cleaning chamber seat. The drive assembly is located below the cleaning chamber seat and is fixedly connected to the bottom end of the plunger. The plunger reciprocates under the action of the drive assembly. The cleaning chamber seat has an inlet and an outlet for the entry and exit of cleaning fluid on both sides. The inlet and outlet are respectively provided with flexible inlet umbrella valves and outlet umbrella valves. The bottom of the cleaning chamber seat is provided with a flexible pumping diaphragm. The pumping diaphragm is sleeved on the plunger and sealed to the drive assembly. The pumping diaphragm stretches or contracts under the action of the drive assembly. When the pumping diaphragm is in a stretched state, the inlet umbrella valve is opened; when the pumping diaphragm is in a contracted state, the outlet umbrella valve is opened.

[0006] Furthermore, both the inlet umbrella valve and the outlet umbrella valve include an umbrella handle and an umbrella surface fixedly connected to the umbrella handle. The inner surface of the umbrella surface near the umbrella handle matches the end face of the liquid inlet or liquid outlet. Both the liquid inlet and the liquid outlet are provided with mounting holes. The umbrella handle is fixedly installed in the mounting holes. The umbrella surface is sealed to the end face of the liquid inlet or liquid outlet. The inner surface of the umbrella surface of the inlet umbrella valve faces away from the plunger, and the inner surface of the umbrella surface of the outlet umbrella valve faces the plunger.

[0007] Furthermore, a boss is provided at the end of the umbrella handle away from the umbrella surface. The size of the boss is larger than the size of the mounting hole. The boss and the umbrella surface are located at opposite ends of the mounting hole, and the umbrella surface is sealed and abutted against the liquid inlet and liquid outlet under the elastic action of the boss.

[0008] Furthermore, both the inlet umbrella valve and the outlet umbrella valve are made of rubber.

[0009] Furthermore, the drive assembly includes a drive shaft, a camshaft, and a motor. The top end of the drive shaft is fixedly connected to a plunger and sealed to a pump diaphragm via a nut. The bottom end of the drive shaft is connected to the camshaft, which is driven by the motor. The drive shaft moves up and down under the drive of the motor.

[0010] Beneficial effects: 1. In this utility model, by setting up an inlet umbrella valve, an outlet umbrella valve and a pumping diaphragm, a pressure difference can be formed in the cleaning chamber seat during the plunger's suction and discharge process. Under the action of the pressure difference, the cleaning fluid is pumped in and out, thereby realizing the cleaning of the plunger.

[0011] 2. In this utility model, the design of the umbrella handle, umbrella surface, and mounting hole facilitates the installation and fixation of the inlet and outlet umbrella valves. It also ensures a sealing effect when the internal and external pressure difference of the cleaning chamber seat is equal. The arrangement of the back of the inlet umbrella valve's umbrella surface facing the plunger and the inner surface of the outlet umbrella valve's umbrella surface facing the plunger ensures unidirectional flow of the cleaning fluid. The protrusion prevents the inlet and outlet umbrella valves from detaching from the mounting hole and improves the sealing effect when the internal and external pressure difference of the cleaning chamber seat is equal. The rubber material allows the inlet and outlet umbrella valves to deform under negative or positive pressure, thereby opening the inlet or outlet.

[0012] 3. In this utility model, by setting up a transmission shaft, a camshaft and a motor, the motor can drive the camshaft to rotate, and the rotation of the camshaft can realize the up-and-down reciprocating motion of the transmission shaft and the plunger. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a cross-sectional view of the overall structure of this utility model; Figure 2 This is a sectional view of the installation structure of the inlet umbrella valve, outlet umbrella valve, and cleaning chamber seat of this utility model; Figure 3 This is a schematic diagram of the liquid absorption process of this utility model; Figure 4 This is a schematic diagram of the liquid discharge process of this utility model.

[0015] Explanation of reference numerals in the attached figures: 1. Plunger; 2. Pump diaphragm; 3. Outlet umbrella valve; 4. Inlet umbrella valve; 5. Motor; 6. Camshaft; 7. Drive shaft; 8. Nut; 9. Cleaning chamber seat. Detailed Implementation

[0016] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0017] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0018] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0019] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0020] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0021] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0022] This utility model provides a high-pressure pump with a long-life self-cleaning structure, such as... Figures 1 to 4As shown, the system includes a high-pressure pump body, which comprises a plunger 1, a cleaning chamber seat 9, and a drive assembly. The plunger 1 is slidably mounted within the cleaning chamber seat 9. The drive assembly is located below the cleaning chamber seat 9 and is fixedly connected to the bottom end of the plunger 1. The plunger 1 reciprocates under the action of the drive assembly. The cleaning chamber seat 9 has an inlet and an outlet for the cleaning fluid on both sides. Flexible inlet umbrella valves 4 and 3 are respectively installed in the inlet and outlet. A flexible... The pumping diaphragm 2 is sleeved outside the plunger 1 and is sealed to the drive assembly. The pumping diaphragm 2 is stretched or contracted under the action of the drive assembly. When the pumping diaphragm 2 is in the stretched state, the inlet umbrella valve 4 is opened. When the pumping diaphragm 2 is in the contracted state, the outlet umbrella valve 3 is opened. Specifically, the pumping diaphragm 2 is made of rubber material and designed as a flanged cup-shaped structure. The external leakage seal is achieved by pressing the flange edge with the cleaning chamber seat 9. The inner ring passes through the plunger 1 and is pressed onto the drive assembly by the nut 8 to achieve the internal leakage seal.

[0023] In this embodiment, by setting up the inlet umbrella valve 4, the outlet umbrella valve 3 and the pumping diaphragm 2, a pressure difference can be formed in the cleaning chamber seat 9 during the plunger 1's suction and discharge process. Under the action of the pressure difference, the cleaning fluid is pumped in and out, thereby realizing the cleaning of the plunger 1. When the pressure difference disappears, the inlet umbrella valve 4 and the outlet umbrella valve 3 return to a sealed connection with the inlet and outlet.

[0024] In this utility model, preferably, such as Figure 1 and Figure 2 As shown, both the inlet umbrella valve 4 and the outlet umbrella valve 3 include an umbrella handle and an umbrella surface fixedly connected to the umbrella handle. The inner surface of the umbrella surface near the umbrella handle matches the end face of the liquid inlet or liquid outlet. Both the liquid inlet and the liquid outlet are provided with mounting holes. The umbrella handle is fixedly installed in the mounting holes. The umbrella surface is sealed to the end face of the liquid inlet or liquid outlet. The inner surface of the umbrella surface of the inlet umbrella valve 4 faces away from the plunger 1, and the inner surface of the umbrella surface of the outlet umbrella valve 3 faces the plunger 1.

[0025] In this embodiment, the umbrella handle, umbrella surface, and mounting hole facilitate the installation and fixation of the inlet umbrella valve 4 and the outlet umbrella valve 3. At the same time, the sealing effect can be ensured when the internal and external pressure difference of the cleaning chamber seat 9 is equal. Combined with the setting that the back of the umbrella surface of the inlet umbrella valve 4 faces the plunger 1 and the inner surface of the umbrella surface of the outlet umbrella valve 3 faces the plunger 1, the unidirectional flow of the cleaning fluid can be ensured.

[0026] In this utility model, preferably, such as Figure 2As shown, the umbrella handle has a boss at the end away from the umbrella surface. The size of the boss is larger than the size of the mounting hole. The boss and the umbrella surface are located at the two ends of the mounting hole, and the umbrella surface is sealed and abutted against the liquid inlet and liquid outlet under the elastic action of the boss. The materials of the inlet umbrella valve 4 and the outlet umbrella valve 3 are both rubber.

[0027] In this embodiment, the protrusion prevents the inlet umbrella valve 4 and outlet umbrella valve 3 from falling off the mounting hole, and improves the sealing effect when the internal and external pressure difference of the cleaning chamber seat 9 is equal. Combined with the rubber material, the inlet umbrella valve 4 and outlet umbrella valve 3 can easily deform under negative or positive pressure, thereby opening the liquid inlet or liquid outlet.

[0028] In this utility model, preferably, such as Figure 1 As shown, the drive assembly includes a drive shaft 7, a camshaft 6, and a motor 5. The top end of the drive shaft 7 is fixedly connected to the plunger 1 and sealed to the pump diaphragm 2 by a nut 8. The bottom end of the drive shaft 7 is connected to the camshaft 6. The camshaft 6 is connected to the motor 5. The drive shaft 7 moves up and down under the drive of the motor 5.

[0029] In this embodiment, by setting up the transmission shaft 7, the camshaft 6 and the motor 5, the motor 5 can drive the camshaft 6 to rotate, and the rotation of the camshaft 6 can realize the up-and-down reciprocating motion of the transmission shaft 7 and the plunger 1.

[0030] Working principle: like Figure 1 and Figure 3 As shown, the liquid suction process is as follows: the motor 5 drives the camshaft 6 to rotate. The camshaft 6 runs from the top dead center to the bottom dead center, the plunger 1 retracts, and the pump diaphragm 2 is straightened at the same time. At this time, a negative pressure is formed in the cavity. Under the action of atmospheric pressure, the inlet umbrella valve is opened. At this time, the cleaning liquid in the pipeline is sucked into the cavity. When the pressure difference between the inside and outside is equal, the inlet umbrella valve 4 returns to the initial closed state. like Figure 1 and Figure 4 As shown, the drainage process is as follows: Motor 5 drives camshaft 6 to rotate. Camshaft 6 runs from bottom dead center to top dead center, and plunger 1 pushes forward, simultaneously restoring the pump diaphragm 2 from a stretched state to a contracted or folded state. At this time, positive pressure is formed in the cavity, and the pressure in the cavity is greater than atmospheric pressure. Under the pump pressure, the outlet umbrella valve is opened, and the cleaning fluid in the cavity is pumped out of the cavity. When the pressure difference between the inside and outside is equal, the outlet umbrella valve 3 returns to the initial closed state.

[0031] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0032] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A high-pressure pump with a long-life self-cleaning structure, comprising a high-pressure pump body, the high-pressure pump body including a plunger (1), a cleaning chamber seat (9) and a drive assembly, wherein the plunger (1) is slidably installed in the cleaning chamber seat (9), the drive assembly is located below the cleaning chamber seat (9) and fixedly connected to the bottom end of the plunger (1), and the plunger (1) reciprocates under the action of the drive assembly, characterized in that, The cleaning chamber seat (9) is provided with an inlet and an outlet for the cleaning fluid on both sides. The inlet and outlet are provided with flexible inlet umbrella valves (4) and outlet umbrella valves (3), respectively. The bottom of the cleaning chamber seat (9) is provided with a flexible pumping diaphragm (2). The pumping diaphragm (2) is sleeved on the plunger (1) and sealed to the drive assembly. The pumping diaphragm (2) is stretched or contracted under the action of the drive assembly. When the pumping diaphragm (2) is in the stretched state, the inlet umbrella valve (4) is opened. When the pumping diaphragm (2) is in the contracted state, the outlet umbrella valve (3) is opened.

2. The high-pressure pump with a long-life self-cleaning structure according to claim 1, characterized in that, Both the inlet umbrella valve (4) and the outlet umbrella valve (3) include an umbrella handle and an umbrella surface fixedly connected to the umbrella handle. The inner surface of the umbrella surface near the umbrella handle matches the end face of the liquid inlet or liquid outlet. Both the liquid inlet and the liquid outlet are provided with mounting holes. The umbrella handle is fixedly installed in the mounting holes. The umbrella surface is sealed to the end face of the liquid inlet or liquid outlet. The inner surface of the umbrella surface of the inlet umbrella valve (4) is away from the plunger (1), and the inner surface of the umbrella surface of the outlet umbrella valve (3) faces the plunger (1).

3. The high-pressure pump with a long-life self-cleaning structure according to claim 2, characterized in that, The umbrella handle has a protrusion at the end away from the umbrella surface. The size of the protrusion is larger than the size of the mounting hole. The protrusion and the umbrella surface are located at opposite ends of the mounting hole, and the umbrella surface is sealed against the liquid inlet and liquid outlet under the elastic action of the protrusion.

4. The high-pressure pump with a long-life self-cleaning structure according to claim 3, characterized in that, Both the inlet umbrella valve (4) and the outlet umbrella valve (3) are made of rubber.

5. A high-pressure pump with a long-life self-cleaning structure according to any one of claims 1 to 4, characterized in that, The drive assembly includes a drive shaft (7), a camshaft (6) and a motor (5). The top end of the drive shaft (7) is fixedly connected to the plunger (1) and sealed to the pump diaphragm (2) by a nut (8). The bottom end of the drive shaft (7) is connected to the camshaft (6). The camshaft (6) is connected to the motor (5) in a drive connection. The drive shaft (7) moves up and down under the drive of the motor (5).

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