A pump head assembly for a high-pressure constant flow pump in a liquid chromatograph

Abstract

This utility model discloses a pump head assembly for a high-pressure constant flow pump in a liquid chromatograph, relating to the field of liquid chromatograph technology. It includes a pump head seat and a connecting ring. The connecting ring is fixedly installed on one side of the outer surface of the pump head seat. A cylindrical groove is formed on one side of the outer surface of the pump head seat, and a plunger assembly is provided inside the pump head seat. A snap-fit ​​assembly is provided inside the connecting ring. This utility model, by setting the snap-fit ​​assembly, allows for separate disassembly of the pump head. Rotating the protective cylinder separates the protective cylinder from the threaded cylinder, pulling the connecting circular plate outward, and moving the fixing rod. The snap-fit ​​plate, fixedly connected to one end of the fixing rod, moves accordingly, disengaging from the groove on the outer surface of the pump head. The pump head is then pulled out and inserted into the connecting ring. The outer surface of the pump head presses against the snap-fit ​​plate, thereby pressing the connecting spring and the fixing rod, pushing the snap-fit ​​plate outward until it contacts the inner wall of the groove on the outer surface of the pump head for snap-fit, completing the pump head installation and improving the efficiency of pump head disassembly and maintenance.

Description

Technical Field

[0001] This utility model relates to the field of liquid chromatography technology, specifically to a pump head assembly of a high-pressure constant flow pump for a liquid chromatograph. Background Technology

[0002] The high-pressure constant flow pump is one of the most important components of a liquid chromatograph. Existing high-pressure constant flow pump assemblies include a pump head, pump head seat, plunger section, compression spring, and plunger seal. The pump head seat has a cavity within which the plunger section reciprocates along its axis. A roller is mounted at one end of the plunger section, and a fixed plunger is located at the other end. The plunger seal is an integral structure through which the plunger passes. The roller engages with the cam of the high-pressure constant flow pump. However, after prolonged use, the internal seals of existing pump head assemblies may age and become damaged, affecting the continued use of the pump head assembly. Furthermore, when not in use, the pump head is not effectively protected, and dust easily accumulates on its exterior, impacting the detection precision of the liquid chromatograph upon reuse.

[0003] As disclosed in Chinese Patent CN202007754U, the pump head assembly of a high-pressure constant flow pump for a liquid chromatograph includes a pump head, a pump head seat, a plunger section, a compression spring, and a plunger seal. The plunger section includes a sliding sleeve with a roller mounted at one end, a plunger seat, and a plunger. The sliding sleeve has a blind hole that accommodates the plunger seat, and the plunger seat has a degree of freedom. One end of the plunger seat is spherical, and the other end has a blind hole adapted to the plunger. The plunger extends into the blind hole of the plunger seat and is integrally connected to the plunger seat. This utility model's pump head assembly for a high-pressure constant flow pump for a liquid chromatograph employs a floating plunger structure, reducing the impact of the component force generated during plunger movement on the plunger seal, extending the service life of the plunger seal, and reducing maintenance costs.

[0004] However, the pump head assembly of the high-pressure constant flow pump of this liquid chromatograph is quite troublesome to disassemble and maintain. The pump head is not easy to disassemble and install. When maintenance is required, the pump head cannot be disassembled separately, but the entire assembly must be disassembled, which increases the workload.

[0005] To address this issue, a pump head assembly for a high-pressure constant flow pump in a liquid chromatograph is proposed. Utility Model Content

[0006] The purpose of this utility model is to provide a pump head assembly for a high-pressure constant flow pump for a liquid chromatograph in order to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0008] A pump head assembly for a high-pressure constant flow pump in a liquid chromatograph includes a pump head seat and a connecting ring. The connecting ring is fixedly installed on one side of the outer surface of the pump head seat. A cylindrical groove is formed on one side of the outer surface of the pump head seat. A plunger assembly is provided on one side of the inner surface of the pump head seat. A snap-fit ​​assembly is provided inside the connecting ring.

[0009] Furthermore, the snap-fit ​​assembly includes a spring groove formed in the inner wall of the connecting ring, a connecting spring fixedly connected to the inner wall of the spring groove, a snap-fit ​​plate fixedly connected to one end of the connecting spring, a circular hole penetrating one side of the inner wall of the spring groove, a fixing rod fixedly connected to one side of the outer surface of the snap-fit ​​plate, a connecting circular plate fixedly connected to one end of the fixing rod, a threaded cylinder fixedly installed on one side of the outer surface of the connecting ring, a protective cylinder engaging the outer surface of the threaded cylinder, and a pump head installed inside the protective cylinder.

[0010] Furthermore, the plunger assembly includes a connecting rod installed inside one side of the connecting ring, one end of the connecting rod is fixedly connected to a plunger, one side of the outer surface of the plunger is fixedly connected to a compression spring, and the other side of the outer surface of the plunger is fixedly connected to a sliding sleeve, the outer surface of the sliding sleeve being slidably connected to the inner wall of the cylindrical groove.

[0011] Furthermore, one end of the outer surface of the pump head contacts one side of the inner wall of the protective cylinder, and a sealing ring sleeve is fitted at the connection between one side of the outer surface of the protective cylinder and the outer surface of the connecting ring.

[0012] Furthermore, the other end of the connecting rod contacts one side of the outer surface of the pump head, and the connecting ring is hollow inside.

[0013] Furthermore, the spring grooves are distributed sequentially at equal intervals on the inner wall of the connecting ring, the circular holes are distributed sequentially at equal intervals on the outer surface of the connecting ring, the fixing rod passes through the circular hole and is fixedly connected to one side of the outer surface of the snap-fit ​​plate, and the outer surface of the pump head is provided with grooves at equal intervals corresponding to the snap-fit ​​plate, and the inner wall of the groove is snapped into the snap-fit ​​plate.

[0014] The beneficial effects of this utility model are as follows:

[0015] This invention, through the inclusion of a snap-fit ​​assembly, allows for separate disassembly of the pump head. Rotating the protective cylinder causes the threads on its inner wall to engage with the outer surface of the threaded cylinder, resulting in separation of the protective cylinder from the threaded cylinder and exposing the pump head. Simultaneously, pulling the connecting plate outwards moves the fixing rod, causing the snap-fit ​​plate, fixedly connected to one end of the fixing rod, to follow the movement and disengage from the groove on the outer surface of the pump head. The pump head is then easily pulled out. For installation, the pump head is inserted into the connecting ring, and the outer surface of the pump head presses against the snap-fit ​​plate, thereby compressing the connecting spring and the fixing rod, pushing the snap-fit ​​plate outwards until it contacts the inner wall of the groove on the outer surface of the pump head. The spring force generated by the connecting spring then pushes the snap-fit ​​plate in the opposite direction, causing it to snap into place with the inner wall of the groove, thus completing the pump head installation. This improves the efficiency of pump head disassembly and maintenance. Furthermore, a sealing ring is fitted at the connection between the protective cylinder and the connecting ring to enhance the sealing effect. Attached Figure Description

[0016] Figure 1 This is a first-view structural schematic diagram of the present invention;

[0017] Figure 2 This is a schematic diagram of the threaded cylindrical structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the internal cross-sectional structure of the pump head seat of this utility model;

[0019] Figure 4 This is a schematic diagram of the plunger assembly structure of this utility model.

[0020] Reference numerals: 1. Pump head seat; 2. Connecting ring; 3. Plunger assembly; 301. Cylinder groove; 302. Connecting rod; 303. Compression spring; 304. Plunger; 305. Sliding sleeve; 4. Snap-fit ​​assembly; 401. Spring groove; 402. Connecting spring; 403. Snap-fit ​​plate; 404. Circular hole; 405. Fixing rod; 406. Connecting circular plate; 407. Threaded cylinder; 408. Protective cylinder; 409. Pump head; 5. Sealing ring sleeve. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] All electrical components mentioned in this article are connected to an external main controller and 220V AC mains power, and the main controller can be a conventional known device such as a computer that can control it.

[0025] In the description of the embodiments of this utility model, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0026] like Figure 1-4 As shown, a pump head assembly for a high-pressure constant flow pump in a liquid chromatograph includes a pump head seat 1 and a connecting ring 2. The connecting ring 2 is fixedly installed on one side of the outer surface of the pump head seat 1. A cylindrical groove 301 is opened on one side of the outer surface of the pump head seat 1. A plunger assembly 3 is provided inside one side of the pump head seat 1. A snap-fit ​​assembly 4 is provided inside the connecting ring 2. The pump head seat 1 is connected to the connecting ring 2. The pump head assembly is installed inside the pump head seat 1 and the connecting ring 2. The plunger assembly 3 is a plunger 304 required for the constant flow pump. The snap-fit ​​assembly 4 snaps the pump head 409 into place, which facilitates the disassembly, maintenance and replacement of the pump head 409.

[0027] The snap-fit ​​assembly 4 includes a spring groove 401 formed in the inner wall of the connecting ring 2. A connecting spring 402 is fixedly connected to the inner wall of the spring groove 401. A snap-fit ​​plate 403 is fixedly connected to one end of the connecting spring 402. A circular hole 404 passes through one side of the inner wall of the spring groove 401. A fixing rod 405 is fixedly connected to one side of the outer surface of the snap-fit ​​plate 403. A connecting circular plate 406 is fixedly connected to one end of the fixing rod 405. A threaded cylinder 407 is fixedly installed on one side of the outer surface of the connecting ring 2. The outer surface of the threaded cylinder 407... A protective sleeve 408 is engaged with the pump head 409 inside the protective sleeve 408. A connecting spring 402 is installed on the inner wall of the spring groove 401. One end of the connecting spring 402 is connected to the outer surface of the snap-fit ​​plate 403, which is connected to the fixing rod 405. When the snap-fit ​​plate 403 is engaged with the inner wall of the groove on the outer surface of the pump head 409, the fixing rod 405 is pulled. The fixing rod 405 drives the snap-fit ​​plate 403 to move outward, so that the snap-fit ​​plate 403 is disengaged from the pump head 409, and the pump head 409 can be removed.

[0028] The plunger assembly 3 includes a connecting rod 302 installed inside one side of the connecting ring 2. One end of the connecting rod 302 is fixedly connected to a plunger 304. A compression spring 303 is fixedly connected to one side of the outer surface of the plunger 304, and a sliding sleeve 305 is fixedly connected to the other side of the outer surface of the plunger 304. The outer surface of the sliding sleeve 305 is slidably connected to the inner wall of the cylindrical groove 301. The sliding sleeve 305 pushes the plunger 304 to slide on the inner wall of the cylindrical groove 301, compressing the compression spring 303. When the compression spring 303 is compressed, the restoring elastic force generated pushes the plunger 304 in the opposite direction, pushing the sliding sleeve 305 to move on the inner wall of the cylindrical groove 301, and performing repeated motion.

[0029] One end of the outer surface of the pump head 409 contacts one side of the inner wall of the protective cylinder 408. A sealing ring sleeve 5 is fitted at the connection between one side of the outer surface of the protective cylinder 408 and the outer surface of the connecting ring 2. The sealing ring sleeve 5 is fitted onto the outer surface of the gap between the contact surface of the protective cylinder 408 and the connecting ring 2 to seal the contact point, so that the connection between the protective cylinder 408 and the connecting ring 2 forms an overall sealed space, preventing external dust from falling into the gap and affecting the pump head 409.

[0030] The other end of the connecting rod 302 contacts one side of the outer surface of the pump head 409, and the inside of the connecting ring 2 is hollow; the hollow design of the connecting ring 2 facilitates the installation of the pump head 409 and the disassembly and replacement of the pump head 409.

[0031] Spring grooves 401 are distributed at equal intervals on the inner wall of the connecting ring 2, and round holes 404 are distributed at equal intervals on the outer surface of the connecting ring 2. The fixing rod 405 passes through the round holes 404 and is fixedly connected to one side of the outer surface of the snap-fit ​​plate 403. The outer surface of the pump head 409 has grooves at equal intervals corresponding to the snap-fit ​​plate 403, and the inner wall of the groove is snapped into the snap-fit ​​plate 403. The pump head 409 is snapped into the connecting ring 2 by multiple snap-fit ​​plates 403. The multiple snap-fit ​​plates 403 snap-fit ​​and fix the pump head 409, so that the pump head 409 is more stably installed inside the connecting ring 2.

[0032] In summary, the pump head assembly of the high-pressure constant flow pump in this liquid chromatograph, with the pump head 409 installed inside the connecting ring 2 mounted on one side of the outer surface of the pump head seat 1, allows for disassembly by removing the sealing ring sleeve 5, rotating the protective cylinder 408 to separate the protective cylinder 408 from the threaded cylinder 407, exposing the pump head 409 protected inside the protective cylinder 408, and simultaneously pulling the four connecting circular plates 406 outwards, causing the fixing rod 405 to move. The fixing rod 405 then moves the locking plate 403, causing the locking plate 403 to engage and disengage from the inner wall of the groove on the outer surface of the pump head 409, thereby allowing the pump head 409 to be extracted. 09. During maintenance and installation of pump head 409, insert pump head 409 into the connecting ring 2. The outer surface of pump head 409 presses against the snap-fit ​​plate 403, causing the snap-fit ​​plate 403 and the fixing rod 405 to move outward from the connecting ring 2. When pump head 409 moves to the point where snap-fit ​​plate 403 contacts the groove on the outer surface of pump head 409, the spring force generated by the compressed connecting spring 402 pushes snap-fit ​​plate 403 to move in the opposite direction, so that snap-fit ​​plate 403 engages with the groove on the outer surface of pump head 409. Rotate the protective cylinder 408 so that the threads of the protective cylinder 408 and the threaded cylinder 407 engage, completing the installation of pump head 409.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A pump head assembly for a high-pressure constant flow pump in a liquid chromatograph, comprising a pump head seat (1) and a connecting ring (2), wherein the connecting ring (2) is fixedly installed on one side of the outer surface of the pump head seat (1), and a cylindrical groove (301) is formed on one side of the outer surface of the pump head seat (1), characterized in that: A plunger assembly (3) is provided on one side inside the pump head seat (1), and a snap-fit ​​assembly (4) is provided inside the connecting ring (2).

2. The pump head assembly of a high-pressure constant flow pump for a liquid chromatograph according to claim 1, characterized in that: The snap-fit ​​assembly (4) includes a spring groove (401) formed on the inner wall of the connecting ring (2). A connecting spring (402) is fixedly connected to the inner wall of the spring groove (401). A snap-fit ​​plate (403) is fixedly connected to one end of the connecting spring (402). A circular hole (404) is passed through one side of the inner wall of the spring groove (401). A fixing rod (405) is fixedly connected to one side of the outer surface of the snap-fit ​​plate (403). A connecting circular plate (406) is fixedly connected to one end of the fixing rod (405). A threaded cylinder (407) is fixedly installed on one side of the outer surface of the connecting ring (2). A protective cylinder (408) engages with the outer surface of the threaded cylinder (407). A pump head (409) is installed inside the protective cylinder (408).

3. The pump head assembly of a high-pressure constant flow pump for a liquid chromatograph according to claim 1, characterized in that: The plunger assembly (3) includes a connecting rod (302) installed inside one side of the connecting ring (2). One end of the connecting rod (302) is fixedly connected to a plunger (304). One side of the outer surface of the plunger (304) is fixedly connected to a compression spring (303). The other side of the outer surface of the plunger (304) is fixedly connected to a sliding sleeve (305). The outer surface of the sliding sleeve (305) is slidably connected to the inner wall of the cylindrical groove (301).

4. The pump head assembly of a high-pressure constant flow pump for a liquid chromatograph according to claim 2, characterized in that: One end of the outer surface of the pump head (409) contacts one side of the inner wall of the protective cylinder (408), and a sealing ring sleeve (5) is fitted at the connection between one side of the outer surface of the protective cylinder (408) and the outer surface of the connecting ring (2).

5. The pump head assembly of a high-pressure constant flow pump for a liquid chromatograph according to claim 3, characterized in that: The other end of the connecting rod (302) contacts one side of the outer surface of the pump head (409), and the connecting ring (2) is hollow inside.

6. The pump head assembly of a high-pressure constant flow pump for a liquid chromatograph according to claim 2, characterized in that: The spring grooves (401) are distributed at equal intervals on the inner wall of the connecting ring (2), the round holes (404) are distributed at equal intervals on the outer surface of the connecting ring (2), the fixing rod (405) passes through the round hole (404) and is fixedly connected to one side of the outer surface of the snap-fit ​​plate (403), and the outer surface of the pump head (409) is provided with grooves at equal intervals corresponding to the snap-fit ​​plate (403), and the inner wall of the groove is snapped into the snap-fit ​​plate (403).

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