Pump head structure of plunger pump

Abstract

The utility model discloses a pump head structure of a plunger pump, which comprises the following components: a pump head which is provided with a pump head stepped hole at the front end and is fixed with a mounting threaded hole at the front end of a pump head seat, and is provided with a pump head circular mounting groove and a pump head circular groove at the rear end; the high-pressure sealing ring assembly is provided with a high-pressure sealing ring assembly center hole; the pump head seat is provided with a pump head seat center hole, the front end face of the pump head seat is provided with a pump head seat boss and a pump head seat front end mounting threaded hole, and the rear end of the pump head seat is provided with a pump head seat rear end circular mounting groove and a pump head seat rear end mounting threaded hole; the low-pressure sealing ring assembly is provided with a low-pressure sealing ring assembly center hole; spring assembly connecting support column threads are arranged on two connecting support columns of the spring assembly, and the spring assembly is matched with the pump head seat; a plunger assembly. The service life of the high-pressure sealing ring can be effectively guaranteed, liquid suction and drainage of the pump head can be improved, liquid in the cavity can be rapidly replaced, and meanwhile the sealing ring can be rapidly detached when needing to be cleaned and replaced.

Description

Technical Field

[0001] The utility model relates to a pump head structure of a plunger pump, which is applied to a liquid phase plunger pump and specifically belongs to the application field of liquid chromatography. Background Art

[0002] There are two ways to install the high-pressure sealing ring of the existing plunger pumps of various manufacturers. One is to use a fixed installation, that is, the position of the high-pressure sealing ring is fixed relative to the pump head and cannot be adjusted. The disadvantage of this structure is that the coaxiality of the plunger and the high-pressure sealing ring is not easy to ensure, which easily causes uneven radial force between the plunger and the high-pressure sealing ring. As the plunger reciprocates, the side of the high-pressure sealing ring that is subjected to greater force is severely worn, which reduces the sealing of the overall structure of the pump head, resulting in leakage of the pump head structure; the other is to use a floating installation, that is, the high-pressure sealing ring is fixed between the high-pressure sealing seat and the high-pressure sealing sleeve to form a high-pressure sealing ring assembly, which is installed in the circular installation groove of the pump head. The inner diameter of the circular installation groove of the pump head is slightly larger than the outer diameter of the high-pressure sealing ring assembly. This structure can improve the coaxiality of the plunger and the high-pressure sealing ring and increase the life of the high-pressure sealing ring, but it adds too many parts and makes the volume of the pump head cavity too large. Utility Model Content

[0003] The purpose of the utility model is to provide a pump head structure of a plunger pump, which can improve the concentricity of high-pressure and low-pressure sealing rings and ensure the service life of the sealing rings. At the same time, the pump head part can be quickly disassembled to facilitate the replacement of the high-pressure sealing ring, and the volume of the pump head cavity can be reduced to quickly replace the liquid in the pump head cavity.

[0004] The utility model structure comprises:

[0005] The pump head has a pump head stepped hole at its front end, which is fixed to the front end mounting threaded hole of the pump head seat by screws, and a pump head circular mounting groove for mounting a high-pressure sealing ring assembly and a pump head circular groove matching the pump head seat at its rear end;

[0006] A high pressure sealing ring assembly is provided with a high pressure sealing ring assembly center hole;

[0007] The pump head seat is provided with a pump head seat center hole, and the front end surface of the pump head seat is provided with a pump head seat boss that matches the circular groove of the pump head, and a pump head seat front end mounting threaded hole for fixing with the pump head, and the rear end of the pump head seat is provided with a pump head seat rear end circular mounting groove for installing a low-pressure sealing ring assembly, and a pump head seat rear end mounting threaded hole for fixing a spring assembly;

[0008] A low-pressure sealing ring assembly is provided with a low-pressure sealing ring assembly center hole;

[0009] The spring assembly has two connecting pillars provided with spring assembly connecting pillar threads, which match with the pump head seat;

[0010] Plunger assembly;

[0011] The high-pressure sealing ring assembly is installed in the circular mounting groove of the pump head, the low-pressure sealing ring assembly is installed in the circular mounting groove at the rear end of the pump head seat, and then the spring assembly is installed on the mounting threaded hole at the rear end of the pump head seat. After the pump head and the pump head seat are fixed together, the plunger assembly is inserted from the rear end of the spring assembly.

[0012] The pump head structure of the plunger pump of the utility model can effectively ensure the life of the high-pressure sealing ring and improve the suction and discharge of the pump head to quickly replace the cavity liquid. At the same time, the sealing ring can be quickly disassembled when it needs to be cleaned and replaced. The details are as follows:

[0013] Firstly, by setting a concentric structure between the pump head and the pump head seat (i.e., a circular groove of the pump head and a boss of the pump head seat), the concentricity of the high-pressure sealing ring and the low-pressure sealing ring is ensured, thereby increasing the service life of the high-pressure sealing ring;

[0014] Secondly, with regard to the method of directly fixing the high-pressure sealing ring on the pump head, the pump head is generally fixed to the pump head seat in the prior art, and the direction of the mounting screws faces the direction of the pump housing. If the pump head is to be removed, the pump head and the pump head seat need to be removed, which is not conducive to later maintenance; therefore, the structure of the utility model installs the pump head and the high-pressure sealing ring assembly as one part on the pump head seat, and the direction of the mounting screws faces the opposite direction of the pump housing, which is convenient for disassembly;

[0015] Secondly, milling the upper and lower sides of the pump head flat can also minimize the volume of the pump head cavity, so as to achieve the purpose of quickly replacing the liquid in the pump head, including a certain amount of bubbles in the pump head, which can also be discharged relatively quickly; BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are included in this specification to provide a further understanding of the utility model, and are incorporated into this specification and constitute a part of this specification. The accompanying drawings express the implementation of the utility model and are used together with the specification to explain the principle of the utility model. In the accompanying drawings:

[0017] Figure 1 It is a front and side view of the overall structure explosion diagram of the utility model.

[0018] Figure 2 It is a rear side view of the overall structure explosion diagram of the utility model.

[0019] The specific numbers in the figure are as follows:

[0020] 1.1 Pump head 1.2 High pressure sealing ring assembly

[0021] 1.3 Pump head seat 1.4 Low pressure sealing ring assembly

[0022] 1.5 Spring assembly 1.6 Plunger assembly

[0023] 1.1.1 Pump head stepped hole 1.1.2 Pump head circular installation groove

[0024] 1.1.3 Circular groove of pump head 1.2.1 Center hole of high pressure sealing ring assembly

[0025] 1.3.1 Pump head seat center hole 1.3.2 Pump head seat boss

[0026] 1.3.3 Threaded hole at the front end of the pump head seat 1.3.4 Circular mounting groove at the rear end of the pump head seat

[0027] 1.3.5 Mounting threaded hole at the rear end of the pump head seat

[0028] 1.4.1 Center hole of low pressure sealing ring assembly 1.5.1 Thread of spring assembly connecting support DETAILED DESCRIPTION

[0029] The structure of the utility model is further described below in conjunction with the accompanying drawings of the specification.

[0030] The terms "front", "rear", "upper", "lower" and the like in the specification and claims are generally used for descriptive purposes and do not necessarily fully describe exclusive relative positions. Here, for convenience, the side close to the pump head is defined as the front, and the side close to the pump head seat is defined as the rear.

[0031] The utility model discloses a pump head structure of a plunger pump, such as Figure 1 , 2 As shown, the details are as follows:

[0032] The pump head 1.1 has a pump head stepped hole 1.1.1 at its front end, which matches with the mounting threaded hole 1.3.3 at the front end of the pump head seat, and a pump head circular mounting groove 1.1.2 for mounting a high-pressure sealing ring assembly and a pump head circular groove 1.1.3 matching with the pump head seat at its rear end;

[0033] The high pressure sealing ring assembly 1.2 is provided with a high pressure sealing ring assembly center hole 1.2.1;

[0034] The pump head seat 1.3 is provided with a pump head seat center hole 1.3.1, and the front end surface of the pump head seat is provided with a pump head seat boss 1.3.2 matched with the circular groove of the pump head, and a pump head seat front end mounting threaded hole 1.3.3 for fixing the pump head, and the rear end of the pump head seat is provided with a pump head seat rear end circular mounting groove 1.3.4 for mounting a low-pressure sealing ring assembly, and a pump head seat rear end mounting threaded hole 1.3.5 for fixing a spring assembly;

[0035] The low-pressure sealing ring assembly 1.4 is provided with a low-pressure sealing ring assembly center hole 1.4.1;

[0036] The spring assembly 1.5 has two connecting pillars provided with spring assembly connecting pillar threads 1.5.1, which match with the pump head seat;

[0037] Plunger assembly 1.6;

[0038] The high-pressure sealing ring assembly 1.2 is installed in the circular mounting groove 1.1.2 of the pump head, the low-pressure sealing ring assembly 1.4 is installed in the circular mounting groove 1.3.4 at the rear end of the pump head seat, and then the spring assembly connecting pillar thread 1.5.1 of the spring assembly 1.5 is installed in the mounting threaded hole 1.3.5 at the rear end of the pump head seat, and then the circular groove 1.1.3 of the pump head is aligned with the boss 1.3.2 of the pump head seat, and then the screws are passed through the pump head stepped hole 1.1.1 and connected with the mounting threaded hole 1.3.3 at the front end of the pump head seat, and after ensuring that the center holes of each component are concentric, the pump head and the pump head seat are fixed together, and finally the plunger assembly 1.6 is inserted from the rear end of the spring assembly to complete the assembly of the entire pump head structure.

Claims

1. A pump head structure of a plunger pump, characterized in that: The pump head structure includes: The pump head has a pump head stepped hole at its front end, which is fixed to the mounting threaded hole at the front end of the pump head seat, and a pump head circular mounting groove and a pump head circular groove matching the pump head seat at its rear end; A high pressure sealing ring assembly is provided with a high pressure sealing ring assembly center hole; The pump head seat is provided with a pump head seat center hole, and the front end surface of the pump head seat is provided with a pump head seat boss and a pump head seat front end mounting threaded hole, and the rear end of the pump head seat is provided with a pump head seat rear end circular mounting groove and a pump head seat rear end mounting threaded hole; A low-pressure sealing ring assembly is provided with a low-pressure sealing ring assembly center hole; The spring assembly has two connecting pillars provided with spring assembly connecting pillar threads, which match with the pump head seat; Plunger assembly.

2. A pump head structure of a plunger pump according to claim 1, characterized in that: The high-pressure sealing ring assembly is installed in the circular installation groove of the pump head.

3. The pump head structure of a plunger pump according to claim 1, characterized in that: The low-pressure sealing ring assembly is installed in the circular installation groove at the rear end of the pump head seat.

4. The pump head structure of a plunger pump according to claim 1, characterized in that: The spring assembly is installed on the mounting threaded hole at the rear end of the pump head seat, and the pump head is fixed together with the pump head seat.

Images