Threaded shaft connecting structure of stamping horizontal multi-stage centrifugal pump

Abstract

The utility model relates to a threaded shaft connecting structure of a stamping horizontal multi-stage centrifugal pump, which is positioned at the shaft extension end of a motor shaft and comprises a pump shaft thread reverse thread section arranged on the pump shaft and a motor shaft reverse thread fine thread hole section arranged at the shaft extension end of the motor shaft. And after the sealing thread glue is arranged in the motor shaft reverse thread fine thread hole section, the pump shaft thread reverse thread section is installed in the motor shaft reverse thread fine thread hole section and screwed tightly. Through the design of the fine-thread left-hand threads, a negative feedback mechanism between the pump shaft and the motor shaft is achieved, and stability and reliability of connection are improved. Anaerobic sealing thread glue is adopted, the sealing thread glue is added in the assembling process, the tightness and the sealing performance of connection are further improved, and medium leakage caused by falling of the pump shaft is prevented. According to the utility model, the assembly process is simple and reliable, and the maintenance and replacement cost caused by the assembly problem is reduced.

Description

Technical Field

[0001] The utility model relates to a threaded shaft connection structure, in particular to a threaded shaft connection structure of a stamping horizontal multi-stage centrifugal pump which realizes a negative feedback mechanism between a pump shaft and a motor shaft through the design of fine-pitch reverse threads, and improves the stability and reliability of the connection. Background Technique

[0002] In the current market, the installation method of the pump shaft of a horizontal stamping multi-stage pump mainly adopts the thermal expansion and contraction method of metal. By using a high-frequency induction heater to quickly heat the motor shaft hole to 600-700 degrees, a gap is formed and then the pump shaft is assembled. However, this method has obvious drawbacks: on the one hand, the interference fit assembly method has uncertainty under special working conditions, increasing the risk of assembly failure; on the other hand, the manufacturing accuracy requirements of parts are high, and it is easily affected by manufacturing errors, resulting in a decrease in assembly reliability. Therefore, there is an urgent need for a new and more reliable pump shaft installation method to improve the adaptability and stability of products. Summary of the Utility Model

[0003] Aiming at the above problems, the main purpose of the utility model is to provide a threaded shaft connection structure of a stamping horizontal multi-stage centrifugal pump which realizes a negative feedback mechanism between a pump shaft and a motor shaft through the design of fine-pitch reverse threads, and improves the stability and reliability of the connection.

[0004] The utility model solves the above technical problems through the following scheme: a threaded shaft connection structure of a stamping horizontal multi-stage centrifugal pump, the threaded shaft connection structure is located at the shaft extension end of the motor shaft, and the threaded shaft connection structure of the stamping horizontal multi-stage centrifugal pump includes: a reverse-thread section of the pump shaft thread provided on the pump shaft, a reverse-thread fine-pitch thread hole section of the motor shaft is provided at the shaft extension end of the motor shaft. During installation, after a sealing thread glue is arranged in the reverse-thread fine-pitch thread hole section of the motor shaft, the reverse-thread section of the pump shaft is installed in the reverse-thread fine-pitch thread hole section of the motor shaft and tightened.

[0005] In a specific embodiment of the utility model, the pump shaft is a spline shaft.

[0006] In a specific embodiment of the utility model, the spline shaft sequentially includes from the pump to the motor: a locking position section in the middle of the pump shaft, a spline shaft body section of the pump shaft, an axial positioning section of the pump shaft, a reverse-thread section of the pump shaft thread, and a positioning hole section of the pump shaft.

[0007] In a specific embodiment of the utility model, the shaft extension end of the motor shaft sequentially includes from the pump to the motor: an axial positioning hole section between the motor shaft and the pump shaft, a reverse-thread fine-pitch thread hole section of the motor shaft, and a reverse-thread fine-pitch thread hole section of the motor shaft.

[0008] In a specific embodiment of the present utility model, during installation, the axial positioning hole section of the motor shaft, the fine-pitch reverse-threaded threaded hole section of the motor shaft, and the fine-pitch reverse-threaded threaded hole section of the motor shaft respectively correspond to the axial positioning section of the pump shaft, the reverse-threaded section of the pump shaft thread, and the positioning hole section of the pump shaft.

[0009] In a specific embodiment of the present utility model, the effective thread length range of the fine-pitch reverse-threaded threaded hole is: 12 - 16 mm for M8 or 19.5 - 26 mm for M12.

[0010] In a specific embodiment of the present utility model, the sealing thread glue is anaerobic sealing thread glue.

[0011] The positive and progressive effects of the present utility model are as follows: Compared with common similar technologies, the threaded shaft connection structure of the stamping horizontal multi-stage centrifugal pump provided by the present utility model realizes a negative feedback mechanism between the pump shaft and the motor shaft through the design of the fine-pitch reverse-threaded thread, improving the stability and reliability of the connection.

[0012] The present utility model adopts anaerobic sealing thread glue and adds the sealing thread glue during the assembly process, further increasing the tightness and sealing performance of the connection and preventing medium leakage caused by the pump shaft falling off.

[0013] The assembly process of the present utility model is simple and reliable, reducing the maintenance and replacement costs caused by assembly problems. Brief Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of the reverse-threaded shaft hole of the motor and the motor.

[0015] Figure 2 It is a schematic structural diagram of the reverse-threaded shaft of the pump provided by the present utility model.

[0016] Figure 3 It is a schematic structural diagram after the assembly of the motor shaft and the pump shaft is completed.

[0017] The following are the names corresponding to the reference numerals in the present utility model:

[0018] Motor shaft 1, shaft extension end 2, pump shaft 3, sealing thread glue 4; Axial positioning hole section 201 of the motor shaft and pump shaft, fine-pitch reverse-threaded threaded hole section 202 of the motor shaft, fine-pitch reverse-threaded threaded hole section 203 of the motor shaft; Middle section locking position section 301, spline body section 302 of the pump shaft, axial positioning section 303 of the pump shaft, reverse-threaded section 304 of the pump shaft thread, positioning hole section 305 of the pump shaft. Detailed Description of the Preferred Embodiment

[0019] The following provides a preferred embodiment of the present utility model in conjunction with the drawings to detail the technical solution of the present utility model.

[0020] Figure 1Schematic diagram of the reverse-thread shaft hole of the motor and the structure of the motor Figure 2 Schematic diagram of the structure of the reverse-thread shaft of the pump provided by the present utility model Figure 3 Schematic diagram of the structure after the motor shaft and the pump shaft are assembled. As Figures 1-3 shown: The threaded shaft connection structure of the stamping horizontal multi-stage centrifugal pump proposed by the present utility model is located at the shaft extension end 2 of the motor shaft 1. The threaded shaft connection structure of the stamping horizontal multi-stage centrifugal pump includes: a reverse-thread section 304 of the pump shaft provided on the pump shaft 3, and a reverse-thread fine-pitch threaded hole section 202 is provided at the shaft extension end 2 of the motor shaft 1. During installation, after a sealing thread glue 4 is provided in the reverse-thread fine-pitch threaded hole section 202 of the motor shaft, the reverse-thread section 304 of the pump shaft is installed in the reverse-thread fine-pitch threaded hole section 202 of the motor shaft and tightened.

[0021] In a specific embodiment of the present utility model, the pump shaft 3 is Figure 2 the spline shaft shown.

[0022] The spline shaft sequentially includes from the pump to the motor: a middle-section locking position section 301, a pump shaft spline body section 302, a pump shaft axial positioning section 303, a pump shaft reverse-thread section 304, and a pump shaft positioning hole section 305.

[0023] The shaft extension end of the motor shaft sequentially includes from the pump to the motor: an axial positioning hole section 201 of the motor shaft and the pump shaft, a reverse-thread fine-pitch threaded hole section 202 of the motor shaft, and a reverse-thread fine-pitch threaded hole section 203 of the motor shaft.

[0024] The axial positioning hole section 201 of the motor shaft and the pump shaft, the reverse-thread fine-pitch threaded hole section 202 of the motor shaft, and the reverse-thread fine-pitch threaded hole section 203 of the motor shaft respectively correspond to the pump shaft axial positioning section 303, the pump shaft reverse-thread section 304, and the pump shaft positioning hole section 305.

[0025] The effective thread length range of the fine-pitch reverse-thread threaded hole is: 12 - 16 mm for M8 or 19.5 - 26 mm for M12. (In the specific implementation process, other parameters can also be taken.)

[0026] The thread of the fine-pitch reverse-thread threaded hole is: M8x1.25 - 7H - LH / M12x1 - 7H - LH. (In the specific implementation process, other parameters can also be taken).

[0027] In the specific implementation process, the sealing thread glue in the present utility model is anaerobic sealing thread glue.

[0028] The technical solution of the present utility model mainly includes the following steps: Design and process a fine-thread reverse-thread shaft and a fine-thread reverse-thread shaft hole to ensure that the two can be precisely matched (the motor shaft thread and the axial positioning hole of the pump shaft need to be accurately concentric). Use a torque wrench to tighten the pump shaft and the motor shaft through the thread, and at the same time add a special anaerobic sealant thread glue to increase the tightness and sealing performance of the connection. The tightening force reaches a preset value (such as 10 N·M to 40 N·M, and the appropriate torque can be selected according to the thread size) to ensure a firm connection between the pump shaft and the motor shaft. After the sealant thread glue is completely cured, a stable and high-strength connection is formed between the pump shaft and the motor shaft, effectively resisting the reverse force generated during the operation of the water pump.

[0029] Through the design of the fine-thread reverse-thread, the present utility model realizes a negative feedback mechanism between the pump shaft and the motor shaft, improving the stability and reliability of the connection.

[0030] The present utility model adopts an anaerobic sealant thread glue and adds the sealant thread glue during the assembly process to further increase the tightness and sealing performance of the connection and prevent the medium from leaking due to the pump shaft falling off.

[0031] The present utility model applies a preset high-strength tightening force through a torque wrench to ensure a firm and reliable connection between the pump shaft and the motor shaft.

[0032] Through precise thread matching and high-strength tightening force, the present utility model ensures a firm and reliable connection between the pump shaft and the motor shaft, reducing the risk of assembly failure.

[0033] The present utility model is applicable to various non-general conventional operating conditions, improving the adaptability and market competitiveness of the product.

[0034] The assembly process of the present utility model is simple and reliable, reducing the maintenance and replacement costs caused by assembly problems.

[0035] The above shows and describes the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A threaded shaft connection structure for a stamping horizontal multi-stage centrifugal pump, characterized in that: The threaded shaft connection structure is located at the shaft extension end of the motor shaft. The threaded shaft connection structure of the stamping horizontal multistage centrifugal pump includes: a reverse-thread section of the pump shaft thread provided on the pump shaft, and a reverse-thread fine-pitch threaded hole section of the motor shaft is provided at the shaft extension end of the motor shaft. During installation, after applying sealing thread glue in the reverse-thread fine-pitch threaded hole section of the motor shaft, the reverse-thread section of the pump shaft is installed in the reverse-thread fine-pitch threaded hole section of the motor shaft and tightened.

2. The threaded shaft connection structure of the stamping horizontal multistage centrifugal pump according to claim 1, characterized in that: The pump shaft is a spline shaft.

3. The threaded shaft connection structure of the stamping horizontal multistage centrifugal pump according to claim 2, characterized in that: The spline shaft sequentially includes, from the pump to the motor direction: a locking position section in the middle of the pump shaft, a spline body section of the pump shaft, an axial positioning section of the pump shaft, a reverse-thread section of the pump shaft thread, and a positioning hole section of the pump shaft.

4. The threaded shaft connection structure of the stamping horizontal multistage centrifugal pump according to claim 3, wherein: The shaft extension end of the motor shaft sequentially includes, from the pump to the motor direction: an axial positioning hole section of the motor shaft and the pump shaft, and a reverse-thread fine-pitch threaded hole section of the motor shaft.

5. The threaded shaft connection structure of the stamping horizontal multistage centrifugal pump according to claim 4, characterized in that: During installation, the axial positioning hole section of the motor shaft and the pump shaft, the reverse-thread fine-pitch threaded hole section of the motor shaft, and the reverse-thread fine-pitch threaded hole section of the motor shaft respectively correspond to the axial positioning section of the pump shaft, the reverse-thread section of the pump shaft thread, and the positioning hole section of the pump shaft.

6. The threaded shaft connection structure of the stamping horizontal multi-stage centrifugal pump according to claim 1, characterized in that: The effective thread length range of the fine-pitch reverse-thread threaded hole is: 12 - 16 mm for M8 or 19.5 - 26 mm for M12.

7. The threaded shaft connection structure of the stamping horizontal multi-stage centrifugal pump according to claim 1, characterized in that: The sealing thread glue is anaerobic sealing thread glue.

Images