A welded pump cover with cooling chamber
The welded pump cover with a cooling cavity addresses high-temperature issues by maintaining the mechanical seal cavity below 70°C, improving sealing performance and extending its life, ensuring safer and more reliable pump operation.
Patent Information
- Application Number
- CN201811310967.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2018-11-06
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2038-11-06
AI Technical Summary
Existing pumps transporting high-temperature media face issues with mechanical seal performance degradation due to high temperatures, leading to vaporization and reduced service life, primarily because the pump cover temperature exceeds 70°C, affecting the sealing performance and durability of the mechanical seal.
A welded pump cover with an integrated cooling cavity, featuring a labyrinth structure and connected cooling water channels, reduces heat transfer and maintains the mechanical seal cavity temperature below 70°C through efficient cooling, using U-shaped or V-shaped groove welding and heat treatment processes.
The solution effectively prevents vaporization at the mechanical seal friction pair, enhances sealing performance, and extends the mechanical seal's service life, making the pump operation safer and more reliable.
Smart Images
Figure CN111140540B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a pump cover on a pump casing, and more particularly to a welded pump cover with a cooling cavity. Background Art
[0002] Some existing pumps need to transport high-temperature media, such as Figure 1 As shown, a medium with a temperature of about 150-180°C is transported in the high-temperature cavity 2 of the pump housing 1. This type of pump shaft seal generally adopts a mechanical seal. The mechanical seal is in a sealing cavity 6 composed of a pump cover 3, a bearing cavity 4, and a pump shaft 5. A cooling water inlet and outlet interface 7 is arranged in the sealing cavity 6 of the pump cover 3, and the mechanical sealing components are cooled by connecting the cooling water.
[0003] Since the high-temperature cavity 2 and the sealing cavity 6 are separated only by the pump cover 3, the temperature of the pump cover 3 is very high due to the high temperature of the conveying medium, which causes the temperature of the sealing cavity 6 near the pump cover 3 to be high, and the temperature of the static ring of the mechanical seal to be relatively high. When the temperature in the mechanical seal cavity exceeds 70°C, vaporization occurs at the friction pair between the static ring and the dynamic ring, thereby affecting the sealing performance. In addition, the rubber seal on the mechanical seal is prone to aging, affecting the service life of the mechanical seal. Summary of the invention
[0004] In view of the above-mentioned defects existing in the prior art, the object of the present invention is to provide a welded pump cover with a cooling chamber, which improves the sealing performance of the mechanical seal and at the same time increases the service life of the mechanical seal, making the pump safer and more reliable to use.
[0005] To achieve the above object, the present invention adopts the following technical solution:
[0006] A welded pump cover with a cooling cavity comprises: a pump cover body and a mechanical sealing cavity, wherein a cooling cavity is provided between the pump cover body and the mechanical sealing cavity, and the cooling cavity is provided on the pump cover body;
[0007] The pump cover body comprises: a pump cover body and a sealing body, the cooling cavity is arranged on the pump cover body, the cooling cavity is arranged in a labyrinth structure, the sealing body is provided with a cooling water to mechanical sealing cavity inlet and outlet interface, and a cooling water to labyrinth cooling cavity inlet and outlet interface, the cooling water to labyrinth cooling cavity inlet and outlet interface are both connected with the cooling cavity through a cooling water flow channel, and the cooling water to labyrinth cooling cavity inlet interface is also connected with external cooling water, the cooling water to mechanical sealing cavity inlet and outlet interface are both connected with the mechanical sealing cavity, the external cooling water enters from the cooling water to labyrinth cooling cavity inlet interface, and enters the sealing cavity along the cooling water flow channel for cooling operation;
[0008] The pump cover body and the sealing cavity body are connected by welding.
[0009] The welding connection adopts U-shaped groove welding, V-shaped groove welding, or welding process and heat treatment process parameters.
[0010] The labyrinth structure comprises: two concentrically arranged outer cavities and inner cavities, the rear ends of the outer cavities and the inner cavities are connected, a water outlet is provided on the front end of the outer cavity, and the water outlet is communicated with the water outlet interface of the cooling water to the labyrinth cooling cavity, and a water inlet is provided on the front end of the inner cavity, and the water inlet is communicated with the water inlet interface of the cooling water to the labyrinth cooling cavity.
[0011] In the above technical scheme, the welded pump cover with a cooling cavity provided by the present invention can greatly reduce the heat transferred through the pump cover, and reduce the temperature in the mechanical seal cavity to below 70°C, thereby avoiding vaporization at the friction pair between the static ring and the dynamic ring in the sealing cavity, improving the sealing of the mechanical seal, and at the same time increasing the service life of the mechanical seal, making the use of the pump safer and more reliable. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a structural schematic diagram of an existing pump cover;
[0013] Figure 2 It is a structural schematic diagram of the welded pump cover of the present invention;
[0014] Figure 3 It is a schematic structural diagram of the sealing cavity in the welded pump cover of the present invention;
[0015] Figure 4 It is a schematic diagram of the labyrinth structure of the cooling cavity in the welded pump cover of the present invention;
[0016] Figure 5 It is a schematic diagram of the interface from cooling water to the mechanical seal cavity in the welded pump cover of the present invention;
[0017] Figure 6 It is a schematic diagram of the interface from cooling water to the cooling cavity in the welded pump cover of the present invention;
[0018] Figure 7 yes Figure 2 An enlarged schematic diagram of the position A of the welded pump cover of the present invention;
[0019] Figure 8 yes Figure 2 An enlarged schematic diagram of the position B of the welded pump cover of the present invention. DETAILED DESCRIPTION
[0020] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.
[0021] Please combine Figures 2 to 8As shown, a welded pump cover with a cooling cavity provided by the present invention comprises: a pump cover body 10, and a mechanical sealing cavity, wherein a cooling cavity is provided between the pump cover body 10 and the mechanical sealing cavity, and the cooling cavity is provided on the pump cover body 10. Since the pump cover has to withstand high temperature and high pressure, the pump cover is a forging, but the forging cannot form a cooling cavity.
[0022] Therefore, the original pump cover is disassembled, and the pump cover body 10, including: a pump cover body 11 and a sealing body 12, is convenient for processing to form a cooling chamber 20. The cooling chamber 20 is arranged on the pump cover body 11, and the cooling chamber 20 is arranged in a labyrinth structure. The sealing body 12 is provided with a cooling water to mechanical sealing chamber water inlet interface 13, a water outlet interface, and a cooling water to labyrinth cooling chamber water inlet interface 14, a water outlet interface. The cooling water to the labyrinth cooling chamber water inlet and outlet interfaces are both connected to the cooling chamber 20 through the cooling water flow channel 17, and the cooling water to the labyrinth cooling chamber water inlet interface 13 is also connected to the external cooling water. The cooling water to the mechanical sealing chamber water inlet and outlet interfaces are both connected to the mechanical sealing chamber. The external cooling water enters from the cooling water to the labyrinth cooling chamber water inlet interface 13, and enters the sealing chamber 20 along the cooling water flow channel 17 for cooling operation. Due to the limited space size of the pump cover body 10, the cooling chamber 20 cannot be too large. In order to improve the cooling effect and reduce the impact on the strength of the pump cover body 10, the cooling chamber 20 is set in a maze structure, and the water flows in the direction of the arrow (such as Figure 4 In addition, when designing the inlet and outlet interfaces of cooling water to the mechanical seal cavity and the inlet and outlet interfaces of cooling water to the cooling cavity, it is also necessary to prevent interference with the original mechanical seal cooling water inlet and outlet.
[0023] Preferably, the pump cover 11 and the sealing cavity 12 are connected by welding, and the welding connection adopts U-groove welding, V-groove welding, or welding process and heat treatment process parameters. In order to ensure welding strength and facilitate welding. Welding process assessment is required during welding, and suitable welding rods, welding parameters, and post-weld heat treatment process parameters are selected to determine the welding process and post-weld heat treatment process. After welding, pre-processing is carried out, and the cavity is subjected to a 2.5Ma pressure test. If the pressure test is qualified, PT non-destructive testing is performed on the two welding parts.
[0024] After installation, connect the cooling water and select the appropriate cooling water pressure P, flow Q and temperature T values to cool the cooling cavity according to the temperature of the medium transported by the pump.
[0025] Better, such as Figure 4As shown, the labyrinth structure comprises: two concentrically arranged outer cavities 18 and inner cavities 19, the rear ends of the outer cavities 18 and the inner cavities 19 are connected, a water outlet 15 is provided on the front end of the outer cavities 18, and the water outlet 15 is communicated with the water outlet interface 13 of the cooling water to the labyrinth cooling cavity, and a water inlet 16 is provided on the front end of the inner cavities 19, and the water inlet 16 is communicated with the water inlet interface of the cooling water to the labyrinth cooling cavity, and the water flows in the direction of the arrow, thereby increasing the water path flow length and the heat dissipation area, and also reducing the occupied space.
[0026] In summary, the pump cover of the present invention can greatly reduce the heat transferred through the pump cover, reduce the temperature in the mechanical seal cavity to below 70°C, avoid vaporization at the friction pair between the static ring and the dynamic ring in the seal cavity, improve the sealing performance of the mechanical seal, and at the same time increase the service life of the mechanical seal, making the use of the pump safer and more reliable.
[0027] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, any changes or modifications to the above embodiments will fall within the scope of the claims of the present invention.
Claims
1. A welded pump cover with a cooling chamber, comprising: A pump cover body and a mechanical seal cavity, characterized in that: a cooling cavity is provided between the pump cover body and the mechanical seal cavity, and the cooling cavity is provided on the pump cover body; The pump cover body comprises: a pump cover body and a sealing body, the cooling cavity is arranged on the pump cover body, the cooling cavity is arranged in a labyrinth structure, the sealing body is provided with a cooling water to mechanical sealing cavity inlet and outlet interface, and a cooling water to labyrinth cooling cavity inlet and outlet interface, the cooling water to labyrinth cooling cavity inlet and outlet interface are both connected with the cooling cavity through a cooling water flow channel, and the cooling water to labyrinth cooling cavity inlet interface is also connected with external cooling water, the cooling water to mechanical sealing cavity inlet and outlet interface are both connected with the mechanical sealing cavity, the external cooling water enters from the cooling water to labyrinth cooling cavity inlet interface, and enters the sealing cavity along the cooling water flow channel for cooling operation; The pump cover and the sealing cavity are connected by welding. The welding connection adopts U-shaped groove welding and V-shaped groove welding. The labyrinth structure comprises: two concentrically arranged outer cavities and inner cavities, the rear ends of the outer cavities and the inner cavities are connected, a water outlet is provided on the front end of the outer cavity, and the water outlet is communicated with the water outlet interface of the cooling water to the labyrinth cooling cavity, and a water inlet is provided on the front end of the inner cavity, and the water inlet is communicated with the water inlet interface of the cooling water to the labyrinth cooling cavity.