Condensate pump motor

Abstract

The utility model provides a condensate pump motor, which relates to the technical field of power production and comprises a rotor shaft, an upper end cover and a lower end cover. The upper end cover is arranged at the upper end of the rotor shaft and is rotationally connected with the rotor shaft through an upper bearing mechanism; the lower end cover is arranged at the lower end of the rotor shaft and is rotationally connected with the rotor shaft through a lower bearing mechanism; wherein the upper bearing mechanism is arranged between the rotor shaft and the upper end cover and comprises 73-series upper bearings and 63-series upper bearings which are sequentially arranged in the axial direction; an insulating bearing sleeve is sleeved outside the upper bearing mechanism; the lower bearing mechanism is arranged between the rotor shaft and the lower end cover and comprises an NU series lower bearing. According to the utility model, the defect of large vibration of the motor unit of the vertical condensate pump is effectively overcome; through the design of the upper bearing mechanism and the lower bearing mechanism, the vibration of the condensate pump motor in the operation process is effectively reduced, and the condensate pump motor is simple in structure and convenient to overhaul and maintain.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power production, in particular to a condensate pump motor. Background Art

[0002] In the core power systems of thermal power plants, vertical condensate pumps and motor units serve as key equipment for energy conversion and media transport. While their unique long-shaft combination design meets the operational requirements of high lift and high flow, it also poses a potential vibration risk. During long-term, continuous load operation, the equipment is prone to excessive vibration amplitude due to the combined effects of mechanical stress, fluid excitation, and electromagnetic interference. Especially in variable-frequency operation using inverter power, the unit often resonates at specific frequencies due to issues such as output current harmonic distortion and the matching of speed with the system's natural frequency. This causes vibration levels to surge several times, triggering a chain reaction of abnormal bearing wear, loose couplings, or shaft misalignment, seriously threatening the unit's safe and stable operation.

[0003] This situation not only results in massive power generation losses but also significantly increases operational and maintenance costs. For decades, this technical challenge has been a major obstacle to safe production at domestic thermal power plants. Traditional, localized improvement measures, such as dynamic balancing and bearing replacement, only provide short-term relief but fail to fundamentally eliminate the root cause of the vibration. Coupled with the industry's lack of a systematic solution, this issue has long remained unresolved, becoming a key technical bottleneck hindering the efficient and stable operation of thermal power units. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a condensate pump motor to compensate for the defects of the prior art condensate pump motor, such as frequent vibration and large amplitude.

[0005] In view of this, the condensate pump motor of the present invention includes a rotor shaft, an upper end cover and a lower end cover; the upper end cover is arranged at the upper end of the rotor shaft and is rotatably connected to the rotor shaft through an upper bearing mechanism, and the lower end cover is arranged at the lower end of the rotor shaft and is rotatably connected to the rotor shaft through a lower bearing mechanism; wherein,

[0006] The upper bearing mechanism is provided between the rotor shaft and the upper end cover, and includes a 73 series upper bearing and a 63 series upper bearing arranged in sequence along the axial direction of the rotor shaft; an insulating bearing sleeve is provided on the outer shell of the upper bearing mechanism;

[0007] The lower bearing mechanism is provided between the rotor shaft and the lower end cover and includes a NU series lower bearing.

[0008] The condensate pump motor according to the embodiment of the utility model has at least the following technical effects: The improvement of the condensate pump motor structure of the utility model is to solve the problem that has been plaguing the safe operation of domestic thermal power plants for decades: the problem of large vibration of the vertical condensate pump and motor unit, and the lack of effective systematic technical solutions in the domestic industry. After decades of engineering experience, the condensate pump motor has effectively compensated for the large vibration defect of the vertical condensate pump motor unit; by adopting the upper bearing mechanism of the 73 series upper bearings and the 63 series upper bearings arranged in sequence along the axial direction of the rotor shaft, and the lower bearing mechanism using the NU series lower bearings, and providing an insulating bearing sleeve outside the upper bearing mechanism, not only the vibration of the condensate pump motor during operation is effectively reduced, but also the structure of the condensate pump motor is simple and easy to repair and maintain.

[0009] According to some embodiments of the present invention, the 73 series upper bearing is a tapered roller bearing; the 63 series upper bearing is a deep groove ball bearing; and the 73 series upper bearing is located below the 63 series upper bearing.

[0010] According to some embodiments of the present invention, there are symmetrically welded ribs and a stop and an inner circle that are processed by one clamping inside the upper end cover; there are symmetrically welded ribs and a stop and an inner circle that are processed by one clamping inside the lower end cover.

[0011] According to some embodiments of the present invention, the ribs in the upper end cover are distributed in a grid shape; the ribs in the lower end cover are distributed in a grid shape.

[0012] According to some embodiments of the present invention, a machine base is further included, which is arranged between the upper end cover and the lower end cover. Cross-arranged support beams are provided on the side of the machine base, and triangular support ribs are provided on the support beams and are symmetrically arranged.

[0013] According to some embodiments of the present invention, the angle formed by the inclined surface of the triangular supporting rib and the horizontal plane is 45°-60°.

[0014] According to some embodiments of the present invention, a balancing disk is provided at the upper end of the rotor shaft, and a surface of the balancing disk is provided with a plurality of evenly arranged counterweight mounting holes.

[0015] According to some embodiments of the present invention, a mounting support is fixedly installed at the lower end of the machine base, and reinforcing ribs are symmetrically welded inside the mounting support.

[0016] According to some embodiments of the present invention, the surface roughness of the raceways and rolling elements of the 73 series upper bearing, the 63 series upper bearing, and the NU series lower bearing is no greater than 0.4 μm.

[0017] According to some embodiments of the present invention, the inner wall of the insulating bearing sleeve is provided with a friction-reducing coating, and the thickness of the friction-reducing coating is 0.01 mm-0.02 mm.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present drawings or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present drawings. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0020] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the utility model;

[0021] Figure 2 This is the front view of the condensate pump motor of the present utility model;

[0022] Figure 3 This is a schematic diagram of the upper end cover structure of the condensate pump motor of the present utility model;

[0023] Figure 4 This is a schematic diagram of the mounting support structure in the condensate pump motor of the present utility model.

[0024] Description of Figure Numbers:

[0025] 100, rotor shaft; 101, upper end cover; 1011, rib plate; 102, lower end cover; 103, stator; 104, rotor; 105, balancing disc;

[0026] 200, housing; 201, mounting device; 202, detachable device;

[0027] 300, machine base; 301, triangular support ribs;

[0028] 400, install the support; 401, strengthen the rib;

[0029] 500. Condensate pump.

[0030] The purpose, features and advantages of this drawing will be further described with reference to the accompanying drawings in conjunction with the embodiments. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0032] Obviously, the drawings described below are merely examples or embodiments of the present invention. A person skilled in the art can apply the present invention to other similar scenarios based on these drawings without inventive effort. Furthermore, it is understood that, although the effort involved in such a development process may be complex and lengthy, for a person skilled in the art related to the disclosure of the present invention, any design, manufacturing, or production changes based on the technical content disclosed in the present invention are merely conventional technical means and should not be construed as an insufficiency of the disclosure of the present invention.

[0033] However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters and repetitive descriptions of substantially identical structures may be omitted. This is to avoid unnecessary redundancy in the following description and to facilitate understanding by those skilled in the art. Furthermore, the drawings and the following description are provided to facilitate a thorough understanding of the present invention by those skilled in the art and are not intended to limit the subject matter of the claims.

[0034] See also Figure 1 and Figure 2 As shown, the condensate pump motor of the present invention includes a rotor shaft 100, an upper end cover 101 and a lower end cover 102; the upper end cover 101 is provided at the upper end of the rotor shaft 100 and is rotatably connected to the rotor shaft 100 through an upper bearing mechanism, and the lower end cover 102 is provided at the lower end of the rotor shaft 100 and is rotatably connected to the rotor shaft 100 through a lower bearing mechanism; wherein the upper bearing mechanism is provided between the rotor shaft 100 and the upper end cover 101, and includes a 73 series upper bearing and a 63 series upper bearing arranged in sequence along the axial direction; an insulating bearing sleeve is provided on the outer shell of the upper bearing mechanism; the lower bearing mechanism is provided between the rotor shaft 100 and the lower end cover 102, and includes a NU series lower bearing.

[0035] Specifically, the condensate pump motor includes a rotor shaft 100, a stator 103, a rotor 104, an upper end cap 101, and a lower end cap 102. The rotor 104 is disposed within the stator 103, and the rotor shaft 100 is disposed vertically within the rotor 104. One end of the rotor shaft 100 is connected to the condensate pump main shaft of the condensate pump 500 (the condensate pump 500 and the condensate pump main shaft are prior art and are not described here). The upper end cap 101 is disposed at the upper end of the rotor shaft 100 and is rotationally connected to the rotor shaft 100 via an upper bearing mechanism. The lower end cap 102 is disposed at the lower end of the rotor shaft 100 and is rotationally connected to the rotor shaft 100 via a lower bearing mechanism.

[0036] The upper bearing mechanism is located between the upper end cap 101 and the rotor shaft 100. It includes a 73-series upper bearing and a 63-series upper bearing, arranged axially along the rotor shaft 100. The 73-series upper bearing is located near the load-bearing section, while the 63-series upper bearing and the 73-series upper bearing cooperate to jointly bear radial forces and assist in bearing the remaining axial forces. Furthermore, the 73-series upper bearing is located near the condensate pump 500, while the 63-series upper bearing is located away from the condensate pump 500. The 73-series upper bearing is used to bear axial thrust, while the 63-series upper bearing is used for axial limiting. The 73-series bearing utilizes a tapered roller bearing structure to accommodate the large axial forces and certain radial forces generated during the operation of the vertical condensate pump motor. The 63-series bearing utilizes a deep groove ball bearing, which offers excellent rotational accuracy and stability, ensuring the axial position of the motor shaft remains stable during operation and primarily bearing radial forces. An insulating bearing sleeve is arranged outside the upper bearing mechanism. The insulating bearing sleeve is made of high-strength insulating material. A multi-layer insulating structure is arranged inside the insulating bearing sleeve to block the flow path of the shaft current, prevent the generation of shaft current, and avoid damage to the upper bearing mechanism due to corrosion caused by shaft current.

[0037] The lower bearing mechanism, located between rotor shaft 100 and lower end cap 102, includes a NU series lower bearing, designed to withstand radial forces. The design of the upper and lower bearing mechanisms not only effectively reduces vibration during operation of the condensate pump motor, but also offers a simple structure and easy maintenance.

[0038] Furthermore, a housing 200 is provided outside the condensate pump motor to protect it. Housing 200 also includes a mounting device 201 for a control system, which connects to the condensate pump motor to automate its operation. Housing 200 also includes a removable device 202 with a movable opening to facilitate inspection and maintenance of the condensate pump motor.

[0039] In this embodiment, improvements to the condensate pump motor structure are intended to address a decades-long problem plaguing the safe operation of domestic thermal power plants: the high vibration of vertical condensate pumps and motor units, a problem that the domestic industry lacks an effective, systematic technical solution. Through decades of accumulated engineering experience and structural improvements, this condensate pump motor has effectively addressed the high vibration defects of existing vertical condensate pump motor units, fully meeting power plant operating requirements. By employing an upper bearing mechanism comprising 73 series upper bearings and 63 series upper bearings arranged axially along the rotor shaft 100, and a lower bearing mechanism comprising NU series lower bearings, and providing an insulating bearing sleeve outside the upper bearing mechanism, the condensate pump motor not only effectively reduces vibration during operation but also boasts a simple structure and easy maintenance.

[0040] Furthermore, the vibration values ​​of the improved condensate pump motor of the present invention during actual project operation achieved a vibration speed of less than 2 mm / s and a vibration amplitude of less than 0.07 mm. The above vibration values ​​are the results of measurements in accordance with the National Standard of the People's Republic of China GB10068.1-88 "Method for Determining Vibration of Rotating Electric Machines and Limit Vibration Determination Methods." Moreover, the vibration speed of the motor unit of a vertical condensate pump in the prior art is 3 mm / s-10 mm / s, and the vibration amplitude is 0.1 mm-0.3 mm. Obviously, the vibration speed and vibration amplitude of the present condensate pump motor during operation are smaller. Table 1 below shows the vibration values ​​of the present condensate pump motor during operation in some projects. The vibration values ​​include the vibration speed and vibration amplitude of the condensate pump motor. The vibration values ​​are the results of measurements in accordance with the measurement method specified in the National Standard of the People's Republic of China GB10068.1-88 "Method for Determining Vibration of Rotating Electric Machines and Limit Vibration Determination Methods."

[0041] Table 1 Vibration values ​​of the condensing pump motor in some projects

[0042]

[0043] In some specific embodiments of the present invention, see Figure 3 As shown, the upper end cover 101 has symmetrically welded ribs 1011 and a stopper and inner circle that are processed by one clamping process; the lower end cover 102 has symmetrically welded ribs 1011 and a stopper and inner circle that are processed by one clamping process.

[0044] Specifically, both the upper end cover 101 and the lower end cover 102 are made of high-strength cast iron and are thickened to a thickness of 100mm-300mm to ensure sufficient strength and rigidity. Ribs 1011 are symmetrically welded within the upper end cover 101. The material of ribs 1011 is the same as that of the upper end cover 101, thereby ensuring the consistency and stability of the overall structure. By rationally arranging the welding sequence and direction, deformation during the welding process is reduced, preventing cracks in the upper end cover 101 due to stress concentration during subsequent use. The thickness of ribs 1011 is 0.6-0.8 times the thickness of the upper end cover 101, thereby improving the structural strength and rigidity of the upper end cover 101. Similarly, ribs 1011 are symmetrically welded inside lower end cap 102. Ribs 1011 are made of the same material as lower end cap 102, and deformation during welding is reduced by rationally arranging the welding sequence and direction. Ribs 1011 are 0.6 to 0.8 times thicker than upper end cap 101, enhancing the structural strength and rigidity of lower end cap 102. Furthermore, stoppers and inner circles are integrally formed within both upper and lower end caps 101, 102 to prevent cracks, breakage, and vibration caused by stress concentration during subsequent use.

[0045] In some specific embodiments of the present invention, the ribs 1011 within the upper end cover 101 are arranged in a grid pattern; the ribs 1011 within the lower end cover 102 are also arranged in a grid pattern. This maximizes the structural strength and rigidity of the upper and lower end covers 101, 102 without adding excessive weight. The connections between the ribs 1011 utilize smooth transitions to avoid stress concentration and further enhance the overall reliability of the upper and lower end covers 101, 102.

[0046] In some specific embodiments of the present invention, see Figure 2 As shown, the condensate pump motor also includes a base 300, which is arranged between the upper end cover 101 and the lower end cover 102, and is used to protect the rotor shaft 100, the rotor 104, the stator 103, the upper bearing mechanism and the lower bearing mechanism; cross-arranged support beams are provided on the side of the base 300, and triangular support ribs 301 are provided on the support beams and are arranged symmetrically.

[0047] In this embodiment, the base 300 is located between the upper end cover 101 and the lower end cover 102, with the upper end cover 101 located at the top of the base 300 and the lower end cover 102 located at the bottom. The rotor shaft 100, rotor 104, and stator 103 are arranged vertically within the base 300. One end of the rotor shaft 100 extends beyond the bottom of the base 300 and connects to the condensate pump main shaft of the condensate pump 500. The other end of the rotor shaft 100 extends beyond the top of the base 300. The base 300 is constructed of welded steel plates. Several support beams are installed on the sides of the base 300. These support beams include transverse and longitudinal beams. Every two adjacent transverse and longitudinal beams form a frame. Within each frame, triangular support ribs 301 are installed, with their ends connected at the intersection of the frames. The triangular support ribs 301 are welded symmetrically along the centerline of the side of the base 300 to increase the support strength of the base 300 and reduce the probability of resonance. When welding the support ribs 1011 to the side of the base 300, symmetry is required. After welding the support ribs 1011, the stator 103 is remounted and installed on the dedicated base 300 used by the school bus. The stoppers, flat surfaces, inner circles, and inner circles of the core are installed on the upper and lower end covers 101 and 102 of the base 300 to ensure that the geometric tolerances meet the requirements of the drawings, thereby ensuring uniform air flow and helping to reduce the vibration amplitude of the condensing pump motor during operation.

[0048] In some specific embodiments of the present invention, the angle formed between the inclined surface of the triangular support rib 301 and the horizontal plane is 45°-60°.

[0049] In this embodiment, the angle formed by the inclined surface of the triangular support rib 301 and the horizontal plane is 45°-60°, which enables the triangular support rib 301 to exert the best supporting effect; and the welding area of ​​the triangular support rib 301 covers more than 3 / 4 of the side of the base 300, ensuring that the base 300 has sufficient strength and stability, and helping to reduce the vibration amplitude of the condensing pump motor during operation.

[0050] In some specific embodiments of the present invention, see Figure 2 and Figure 4 As shown, a mounting support 400 is fixedly mounted on the lower end of the machine base 300 , and reinforcing ribs 401 are symmetrically welded inside the mounting support 400 .

[0051] In this embodiment, the mounting bracket 400 is made of cast steel, and reinforcement ribs 401 are welded on the inner sidewalls of the mounting bracket 400. The reinforcement ribs 401 are symmetrically welded and evenly distributed to ensure uniform force on the mounting bracket 400. The mounting bracket 400 is disposed between the base 300 and the condensate pump 500.

[0052] In some specific embodiments of the present invention, a balancing disk 105 is provided at the upper end of the rotor shaft 100 for dynamic balancing of the condensing pump motor when it is running under load on site; a plurality of evenly arranged counterweight mounting holes are provided on the surface of the balancing disk 105 for adding or reducing counterweight blocks.

[0053] In this embodiment, a balancing disc 105 is provided at the upper end of the rotor shaft 100 of the condensing pump motor, which is used to perform dynamic balancing when the condensing pump motor is under load on site, eliminate the imbalance caused by the shaft system, and facilitate the adjustment of the low-frequency resonance peak. A protective cover is provided on the outside of the balancing disc 105 to protect the balancing disc 105, and the protective cover is fixed to the upper surface of the upper end cover 101 by screws. In a specific embodiment, when the condensing pump motor is under load operation, the vibration data of the shaft system is collected by a high-precision dynamic balancing test instrument, and according to the spectrum analysis results, the counterweight blocks are accurately added or reduced at the counterweight installation holes reserved in the balancing disc 105. The counterweight blocks are made of tungsten alloy material with uniform density, and their mass accuracy can reach ±0.1g. Through this dynamic balancing adjustment mechanism, the imbalance of the shaft system caused by manufacturing and assembly factors is effectively eliminated, the vibration amplitude of the rotor shaft 100 is reduced by more than 30%, and the low-frequency resonance peak of the condensing pump motor is optimized and adjusted, significantly improving the smoothness and long-term operation reliability of the condensing pump motor.

[0054] Moreover, the surface of the balancing disc 105 is provided with a number of evenly distributed counterweight mounting holes. The number of the counterweight mounting holes is determined according to the diameter of the balancing disc 105 and the dynamic balancing accuracy requirements, and is generally 8-12. The aperture of the counterweight mounting hole is adapted to the size of commonly used counterweight blocks to ensure that the counterweight blocks can be firmly installed on the balancing disc 105. The processing accuracy of the counterweight mounting holes is high, and the roundness error of the counterweight mounting holes is controlled within ±0.01mm to ensure the balance of the counterweight blocks after installation.

[0055] In some specific embodiments of the present invention, the 73 series upper bearing, the 63 series upper bearing and the NU series lower bearing are all bearings manufactured with high precision grades. The surfaces of the raceways and rolling elements of the 73 series upper bearing, the 63 series upper bearing and the NU series lower bearing are all precision ground and polished, and the surface roughness of the raceways and rolling elements is not greater than 0.4μm; they are used to reduce the friction resistance and noise during the operation of the bearings and improve the service life and operating performance of the bearings.

[0056] In some specific embodiments of the utility model, the inner wall of the insulating bearing sleeve is provided with a friction-reducing coating, and the thickness of the friction-reducing coating is 0.01 mm-0.02 mm.

[0057] In this embodiment, the insulation resistance of the insulating bearing sleeve is not less than 100MΩ under the test conditions of 25°C and 500V. By adopting advanced insulating materials and manufacturing processes, the insulating bearing sleeve is ensured to have excellent insulation performance; and its inner wall is provided with a friction-reducing coating. The friction-reducing coating adopts a special polymer material and has good wear resistance and self-lubricating properties. The thickness of the friction-reducing coating is 0.01mm-0.02mm, which can effectively reduce the friction coefficient between the upper bearing mechanism and the insulating bearing sleeve, reduce friction loss, and improve the operating efficiency of the condensing pump motor.

[0058] It should be noted that the present invention is not limited to the above-described embodiments. The above-described embodiments are merely examples, and any embodiments having substantially the same structure and effect as the technical concept within the scope of the present invention are included within the technical scope of the present invention. Furthermore, within the scope of the present invention, various modifications that can be conceived by those skilled in the art to the embodiments, and other configurations constructed by combining some of the components of the embodiments are also included within the scope of the present invention.

Claims

1. A condensate pump motor, characterized in that: The invention comprises a rotor shaft (100), an upper end cover (101) and a lower end cover (102); the upper end cover (101) is arranged at the upper end of the rotor shaft (100) and is rotatably connected to the rotor shaft (100) via an upper bearing mechanism, and the lower end cover (102) is arranged at the lower end of the rotor shaft (100) and is rotatably connected to the rotor shaft (100) via a lower bearing mechanism; wherein, The upper bearing mechanism is provided between the rotor shaft (100) and the upper end cover (101), and comprises a 73 series upper bearing and a 63 series upper bearing sequentially arranged along the axial direction of the rotor shaft (100); an insulating bearing sleeve is provided on the outer shell of the upper bearing mechanism; The lower bearing mechanism is provided between the rotor shaft (100) and the lower end cover (102), and comprises a NU series lower bearing.

2. The condensate pump motor according to claim 1, characterized in that: The 73 series upper bearing is a tapered roller bearing; the 63 series upper bearing is a deep groove ball bearing; the 73 series upper bearing is located below the 63 series upper bearing.

3. The condensate pump motor according to claim 1, characterized in that: The upper end cover (101) includes symmetrically welded ribs (1011) and a stopper and an inner circle that are processed by one clamping process; the lower end cover (102) includes symmetrically welded ribs (1011) and a stopper and an inner circle that are processed by one clamping process.

4. The condensate pump motor according to claim 3, characterized in that: The ribs (1011) in the upper end cover (101) are distributed in a grid pattern; and the ribs (1011) in the lower end cover (102) are distributed in a grid pattern.

5. The condensate pump motor according to claim 1, characterized in that: The machine base (300) is provided between the upper end cover (101) and the lower end cover (102), and cross-arranged support beams are provided on the side of the machine base (300). Triangular support ribs (301) are provided on the support beams and are symmetrically arranged.

6. The condensate pump motor according to claim 5, characterized in that: The angle formed between the inclined surface of the triangular support rib (301) and the horizontal plane is 45°-60°.

7. The condensate pump motor according to claim 5, characterized in that: A mounting support (400) is fixedly mounted on the lower end of the machine base (300), and reinforcing ribs (401) are symmetrically welded inside the mounting support (400).

8. The condensate pump motor according to claim 1, characterized in that: A balancing disc (105) is provided at the upper end of the rotor shaft (100), and a plurality of evenly arranged counterweight mounting holes are provided on the disc surface of the balancing disc (105).

9. The condensate pump motor according to claim 2, characterized in that: The surface roughness of the raceways and rolling elements of the 73 series upper bearing, the 63 series upper bearing and the NU series lower bearing is no greater than 0.4 μm.

10. The condensate pump motor according to claim 1, characterized in that: The inner wall of the insulating bearing sleeve is provided with a friction-reducing coating, and the thickness of the friction-reducing coating is 0.01 mm-0.02 mm.

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