Product Introduction of Plunger Copper Sleeve
The copper sleeve of the plunger is a sleeve type accessory part in the plunger sealing system of the plunger pump. It is usually installed inside the plunger packing box and fitted on the outer side of the plunger. Together with the plunger cap, packing seal assembly and packing box, it forms the sealing structure at the end of the plunger.
In the typical hydraulic end structure of a plunger pump, after the plunger cap is screwed into the packing box, it exerts an axial force on the plunger copper sleeve, which then forms a corresponding compression and positioning relationship with the internal sealing assembly. Therefore, the plunger copper sleeve is not merely a common shaft sleeve, but an important structural component in the plunger packing assembly that participates in the positioning and clamping of the sealing assembly.
Depending on the design of different plunger pumps, the plunger copper sleeve may also serve to support, guide or isolate the position through which the plunger passes. Its inner diameter, outer diameter, length, end face and assembly dimensions with the packing all need to match the diameter of the plunger, the packing box and the sealing assembly.
The main function of the plunger copper sleeve
1. Transmit axial clamping force: After the plunger cap is tightened, it acts on the plunger copper sleeve. The copper sleeve transmits the corresponding axial force to the packing or sealing assembly, keeping the sealing parts in the specified assembly state.
2. Positioning sealing assembly: It forms an axial limit for the plunger packing, sealing ring or related internal parts to prevent abnormal movement of the sealing assembly during the reciprocating operation of the plunger.
3. Form a passage for the plunger: The center of the plunger copper sleeve fits with the outer diameter of the plunger, reserving a stable passage space for the reciprocating motion of the plunger and maintaining a coaxial relationship with the internal structure of the packing box.
4. Auxiliary support and guidance: Depending on the specific structure of the pump type, the copper sleeve can play a certain supporting or guiding role in the plunger seal assembly, which helps maintain a reasonable working position between the plunger and the packing assembly.
5. Protecting adjacent structures: Sleeve parts can concentrate some direct contact, compression or friction positions on replaceable parts, which is conducive to the later maintenance and part replacement of the plunger seal system.
The fit relationship with the plunger cap and the packing box
The plunger packing box is the main installation body of the entire plunger sealing assembly, containing packing, sealing rings, plunger copper sleeves and related parts inside. The plunger copper sleeve is installed inside the packing box. After the plunger cap is screwed in from the outer end or installed, the copper sleeve is pressed tightly.
It can be simply understood as follows: The packing box is responsible for providing the installation cavity, the plunger copper sleeve is responsible for the internal compression transmission and positioning, the plunger cap is responsible for generating and maintaining the compression force, and the plunger packing or sealing assembly is responsible for the main dynamic sealing of the plunger's reciprocating position.
Structural features
Sleeve structure: The product usually has a central through hole, and the inner diameter needs to be coordinated with the plunger and the overall sealing structure.
The end face participates in compression: The end face of the copper sleeve needs to form a stable contact with the plunger cap or the internal sealing assembly. Therefore, the length and end face size have a direct impact on the assembly state.
The size matching requirements are high: there are fit relationships between the outer diameter and the inner hole of the packing box, the inner diameter and the plunger, and the length and the compression space of the packing combination. It is not advisable to replace them merely based on appearance.
The material is targeted: The term "copper sleeve" in the name usually indicates that the part is made of copper or copper alloy materials. However, the specific material grade, hardness and performance should be determined according to the original accessory and equipment technical requirements. It is not advisable to uniformly specify them without drawings.
The difference from ordinary bushings
Although the copper sleeve of the plunger has a sleeve shape, it is usually not used alone as a rotating bearing in a plunger pump. It is located in the area of the plunger packing box and sealing assembly. Its more important function is to participate in the positioning, compression and plunger channel fit of the packing assembly.
Therefore, when selecting the model, in addition to paying attention to the inner diameter and outer diameter, it is also necessary to verify the total length, end face position, packing combination, plunger cap, and the size of the steps inside the packing box.
Common examination areas
When overhauling the plunger sealing system, the inner hole, outer circle and both end compression surfaces of the plunger copper sleeve should be inspected to observe whether there is obvious wear, scratches, uneven wear, deformation, cracks or abnormal corrosion.
If the end face of the copper sleeve is worn or its length changes significantly, it may affect the pressing state of the plunger cap on the internal sealing assembly. If the inner hole shows severe off-center wear, the coaxiality and installation status of the plunger, packing box and sealing assembly should be further inspected.
Key points for selection
The copper sleeve of the plunger is a dimensional fit part of the plunger sealing assembly. When purchasing, it is recommended to focus on confirming the following information:
1. Brand, series and specific model of plunger pump;
2. Plunger diameter;
3. Inner and outer diameters of the plunger copper sleeve;
4. Total length and end face structure of the copper sleeve;
5. Internal installation dimensions of the packing box;
6. Structure and clamping position of the matching plunger cap;
7. The combined dimensions of the matching packing or sealing components;
8. Requirements for copper sleeve material or original accessory material;
9. Original part number, physical sample or technical drawing.
Installation and Maintenance
Before installation, the inner hole, outer circle and contact surfaces at both ends of the copper sleeve of the plunger should be cleaned. At the same time, check whether there are burrs, foreign objects or obvious damages inside the packing box and on the surface of the plunger.
When the copper sleeve is inserted into the packing box, it should be kept in the correct direction and coaxial state to avoid tilting or forced knocking. After the plunger cap is installed, it should be tightened in accordance with the technical requirements of the corresponding pump type to prevent the sealing components from loosening due to insufficient tightening or abnormal working condition of the packing due to excessive tightening.
If it is found that the copper sleeve has shown obvious wear when replacing the plunger packing, it should be replaced simultaneously according to the actual situation to avoid the old copper sleeve affecting the assembly and usage state of the new sealing component.
Before disassembling the plunger cap, copper sleeve or packing assembly of the high-pressure plunger pump, the shutdown, pressure relief and medium isolation should be completed in accordance with the equipment operation procedures. Maintenance can only be carried out after confirming that there is no residual pressure in the system.
Procurement Instructions
Juli Petroleum Drilling and Production Equipment Co., Ltd. provides copper sleeves for plungers and related accessories for plunger pump plunger sealing systems. The copper sleeves of the plungers of different pump types may vary in inner diameter, outer diameter, length, end face and material. When purchasing, it is recommended to provide the pump model, plunger diameter, packing box specification, original part number, physical size or technical drawing for verification of the corresponding products.