Water pump high-speed motor

Abstract

The invention provides a high-speed motor of a water pump. The high-speed motor mainly solves the problem of how to improve the sealing performance at a high speed. A high-speed motor of a water pump comprises a motor cylinder and a motor upper cover, an output shaft is arranged in the motor cylinder and sleeved with two framework sealing pieces located in the motor upper cover, the high-speed motor is divided into a first oil cavity and a second oil cavity through the framework sealing pieces, one end of the output shaft penetrates through the first oil cavity, and the other end of the output shaft penetrates through the second oil cavity. The framework sealing piece comprises a water sealing piece and an oil sealing piece which are in contact with the output axis, the first oil cavity and the second oil cavity are both filled with lubricating oil, an oil bag is arranged on the high-speed motor, and the oil bag is communicated with the second oil cavity and used for balancing pressure between the second oil cavity and the outside. The framework oil sealing piece in linear contact with the output shaft is arranged on the output shaft in a sleeving mode, the oil film is formed between the framework oil sealing piece and the output shaft for sealing, the second oil cavity and the external pressure are balanced through the oil bag, and the sealing effect at the high rotating speed is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of submersible pumps, and in particular relates to a high-speed motor for a water pump. Background Art

[0002] Submersible pumps, as a device that closely combines pumps and motors into one and operates submersibly, play a key role in liquid transportation. In recent years, thanks to the progress in materials science and motor control technology, variable frequency high-speed motors are increasingly used in submersible pumps. However, as the speed of submersible pump motors increases, their sealing performance faces greater challenges.

[0003] Existing water pumps use mechanical seals. When running at high speeds, the heat and wear of the mechanical seals increase, the sealing effect and service life are greatly reduced, and external water can easily enter the motor, causing damage to the motor. Summary of the invention

[0004] The purpose of the present invention is to address the above-mentioned problems in the prior art and to propose a high-speed motor for a water pump. The technical problem to be solved by the present invention is: how to improve the sealing performance at high speed.

[0005] The objective of the present invention can be achieved through the following technical solutions: a high-speed motor for a water pump, comprising a motor barrel and a motor cover, wherein an output shaft is arranged in the motor barrel, and wherein two skeleton seals located in the motor cover are sleeved on the output shaft, and wherein the high-speed motor is divided by the skeleton seals to form a first oil chamber and a second oil chamber, wherein one end of the output shaft passes through the first oil chamber, and wherein the skeleton seal comprises a water seal and an oil seal in contact with the output axis line, wherein the first oil chamber and the second oil chamber are both filled with lubricating oil, and wherein an oil bag is arranged on the high-speed motor, wherein the oil bag is connected with the second oil chamber and is used to balance the pressure of the second oil chamber with the outside world.

[0006] In the present application, based on the fact that one end of the output shaft on the existing water pump motor passes through the motor cover, two skeleton seals are sleeved on the output shaft, and the skeleton seals are in contact with the output axis to reduce the contact area with the output shaft. The lubricating oil in the first oil chamber is used to form an oil film for sealing between the lip of the skeleton seal and the output shaft, thereby avoiding dry friction between the output shaft and the skeleton seal, thereby ensuring the sealing effect at high speed. In order to reduce the influence of the internal and external pressure difference on the seal, an oil bag is provided on the motor, and the oil bag is used to make the second oil chamber equal to the external pressure.

[0007] In the above-mentioned high-speed motor for water pump, the motor upper cover comprises an inner ring and an outer ring, the outer ring cooperates with the side wall of the motor barrel to form a second oil chamber, and the two skeleton seals cooperate with the inner wall of the inner ring to enclose the first oil chamber. By arranging the skeleton seal in the inner ring, it is easy to install the skeleton seal.

[0008] In the above-mentioned high-speed water pump motor, an output shaft capable of passing through the motor cover from top to bottom is provided in the second oil chamber, and the two skeleton seals are sleeved on the output shaft. The skeleton seal deformed by pressure is located at the lower end, and the other skeleton seal is located at the upper end of the motor cover.

[0009] In the above-mentioned high-speed motor for water pump, a sealing ring is provided above one of the skeleton seals located at the top of the motor cover, and a wear-resistant coating is provided on the inner side of the sealing ring, and the wear-resistant coating is in direct contact with the output shaft. By providing the wear-resistant coating on the sealing ring, while preventing foreign impurities from entering from the front end of the motor cover, the influence of the output shaft on the sealing ring during the rotation process is reduced, thereby ensuring the sealing performance.

[0010] In the above-mentioned high-speed motor for the water pump, a certain amount of air is retained in the first oil chamber. By retaining a small amount of air in the first oil chamber, the lubricating oil is prevented from overflowing due to the increase of the internal temperature during operation.

[0011] In the above-mentioned high-speed motor for the water pump, the oil bag is located on the upper end surface of the motor upper cover and is embedded between the inner ring and the outer ring.

[0012] In the above-mentioned high-speed motor for the water pump, the oil bag is located at the bottom of the motor and cooperates with the motor barrel and the motor upper cover to form a second oil chamber.

[0013] In the above-mentioned high-speed water pump motor, the oil bag is located at the bottom of the motor.

[0014] In the above-mentioned high-speed motor for water pump, when there is a pressure difference between the first oil chamber and the second oil chamber, the lubricating oil in the second oil chamber leaks into the first oil chamber through the oil seal until the pressure of the first oil chamber and the second oil chamber are equal. When the motor is used for a submersible pump and the submersible pump is placed in a deep well, part of the lubricating oil in the second oil chamber causes the pressure on both sides of the above-mentioned skeleton seal to be unbalanced, causing the skeleton seal to deform, and part of the lubricating oil in the second oil chamber leaks into the first oil chamber until the pressure of the two oil chambers is balanced, thereby avoiding leakage caused by the internal and external pressure difference.

[0015] Compared with the prior art, the present invention has the following advantages: Compared with the prior art, the present invention has the following advantages: 1. In the present application, two skeleton seals are sleeved on the output shaft of the motor so that the lip of the skeleton seal contacts the output axis to reduce the contact area. Lubrication and sealing are performed by lubricating oil. While completing the sealing at high speed, the deformation of the oil bag under the action of the internal and external pressure difference is utilized to adjust the internal and external pressures so that the two are equal, thereby improving the sealing performance of the skeleton seal at high speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is an exploded stereoscopic schematic diagram of the first embodiment; Figure 2 is a half-cutaway perspective schematic diagram of the first embodiment; Figure 3 is an exploded cross-sectional schematic diagram of the motor upper cover of the first embodiment; Figure 4 is a cross-sectional schematic diagram of the motor upper cover of the first embodiment; Figure 5 is a cross-sectional schematic diagram of embodiment 2; In the figure, 1, motor barrel; 1a, stator; 1b, rotor; 1b1, output shaft; 1c, shielding sleeve; 2, motor upper cover; 2a, inner ring; 2a1, oil hole; 2a2, skeleton seal; 2a2a, water seal; 2a2b, oil seal; 2b, outer ring; 2c, interval; 2d, connecting part; 3, first oil chamber; 4, motor lower cover; 5, second oil chamber; 6, oil bag; 6a, balance rubber; 6a1, pressurized space; 6b, locking ring; 6c, pressing ring; 6d, connecting hole; 7, sealing retainer ring; 8, bearing; DETAILED DESCRIPTION

[0017] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments. Example

[0018] like Figure 1 as well as Figure 2 As shown, a high-speed motor for a water pump comprises a motor upper cover 2, a motor barrel 1 and a motor lower cover 4, and the motor upper cover 2, the motor barrel 1 and the motor lower cover 4 are matched to form the high-speed motor for the pump, wherein a shielding sleeve 1c and an output shaft 1b1 are arranged in the motor barrel 1, one end of the output shaft 1b1 can pass through the motor upper cover 2, the motor upper cover 2 comprises an inner ring 2a and an outer ring 2b, an oil bag 6 is arranged between the inner ring 2a and the outer ring 2b, the oil bag 6 comprises a locking ring 6b, a clamping ring 6c and a balancing rubber 6a, the locking ring 6b and the clamping ring 6c are connected with the oil bag 6 through an oil hole 2a1, the inner ring 2a is provided with a sealing retaining ring 7, and cooperates with the motor upper cover 2 to form a first oil chamber 3.

[0019] It is worth mentioning that Figure 2As shown, a stator 1a, a rotor 1b and an output shaft 1b1 are arranged in the motor barrel 1, and the output shaft 1b1 is arranged on the rotor 1b. A shielding cover is provided between the stator 1a and the rotor 1b, and the stator 1a and the rotor 1b are separated by the shielding cover. The motor cover 2 cooperates with the shielding sleeve 1c in the motor barrel 1 to form a second oil chamber 5, and a sealing ring 7, two skeleton seals 2a2 and a bearing 8 are arranged in the first oil chamber 3 from top to bottom. The sealing ring 7 and the bearing 8 cooperate with the inner ring 2a of the motor cover 2 to form the first oil chamber 3, and the two skeleton seals 2a2 are located in the first oil chamber 3 and are arranged at intervals.

[0020] like Figure 3 and Figure 4 As shown, the sealing ring 7 is located at the top of the inner ring 2a, and the bearing 8 is located at the bottom of the inner ring 2a, and cooperates with the sealing ring 7 to form a relatively closed first oil chamber 3. One end of the inner ring 2a where the bearing 8 is installed is provided with an oil hole 2a1, and the oil hole 2a1 is used to connect the first oil chamber 3 and the second oil chamber 5. The second oil chamber 5 is formed by the motor upper cover 2 and the shielding sleeve 1c in the motor barrel 1, wherein the second oil chamber 5 and the first oil chamber 3 are filled with lubricating oil.

[0021] More importantly, if Figure 4 As shown, the inner ring 2a and the outer ring 2b are integrally connected through the connecting portion 2d to form the motor cover 2. The motor cover 2 is provided with an oil bag 6 located in the interval 2c between the inner ring 2a and the outer ring 2b. The oil bag 6 includes a locking ring 6b, a pressing ring 6c and a balancing rubber 6a. The balancing rubber 6a is bent inside to form a groove, which cooperates with the connecting hole 6d on the locking ring 6b and the pressing ring 6c to form a pressurized space 6a1 and is connected to the outside. A sealing ring 7 is provided on the top of the inner ring 2a, and the side of the sealing ring 7 in contact with the output shaft 1b1 has a wear-resistant coating.

[0022] In summary, the high-speed motor for the water pump of the present application, based on the existing pump motor, replaces the existing mechanical seal with a first oil chamber 3 composed of multiple skeleton seals 2a2, and fills the first oil chamber 3 and the second oil chamber 5 with lubricating oil. The lubricating oil is used to lubricate the contact position between the skeleton seal 2a2 and the output shaft 1b1, thereby reducing the wear caused by high-speed rotation, and through the viscosity and tension of the lubricating oil, an oil film is formed between the skeleton seal 2a2 and the output shaft 1b1 to improve the high-speed sealing performance of the skeleton seal 2a2 on the output shaft 1b1. Compared with the situation where mechanical seals will accelerate wear when sealing high-speed rotating equipment, the present application lubricates the part where the lip on the skeleton seal 2a2 contacts the output shaft by line contact and filling with lubricating oil, thereby further reducing the possibility of wear.

[0023] Among them, since the skeleton seal 2a2 uses line contact and lubricating oil to form an oil film to seal the output shaft, it is easily affected by the internal and external pressure difference during use, causing the position in contact with the output shaft 1b1 to deform. In order to avoid leakage caused by deformation, an oil bag 6 is arranged between the first oil chamber 3 and the motor cover 2, and a connecting hole 6d is arranged through the upper end surface of the locking ring 6b and the clamping ring 6c to allow external water or other liquids to enter the pressurized space 6a1 formed by the bend in the balancing rubber 6a, and force the pressurized space 6a1 to deform, and then the external water pressure is caused to deform the balancing rubber 6a, so that the pressure inside the motor is equal to that of the outside.

[0024] More importantly, when the motor is initially operated, in order to avoid the problem of imbalance in internal and external pressures due to heating of the motor during operation, the present application sets an oil bag 6 for adjusting the pressure of the second oil chamber 5. When the temperature of the lubricating oil in the second oil chamber 5 rises, the pressure difference between the second oil chamber 5 and the outside is adjusted by the oil bag 6. Since a certain amount of air is retained in the first oil chamber 3, the pressure in the first oil chamber 3 increases during the high-speed movement of the motor. At this time, since the internal pressure is greater than the external pressure, the air in the above space will be discharged to the outside, and the external liquid cannot enter through the discharge position until the internal and external pressures are equal, thereby completing the dynamic adjustment of the internal pressure of the motor.

[0025] It is worth mentioning that when the motor is used in a submersible pump and the submersible pump is placed in a deep well, the second oil chamber is equal to the external pressure, and the pressure in the second oil chamber is higher than the first oil chamber formed by the inner ring and the two skeleton seals. Since the lower end of the inner ring is provided with an oil hole that allows the lubricating oil to bypass the bearing, the lubricating oil in the second oil chamber can enter between the bearing and the oil seal 2a2b through the oil hole 2a1. By utilizing the characteristic that the pressure difference on both sides of the skeleton seal 2a2 will cause deformation, part of the lubricating oil in the second oil chamber 5 can enter the first oil chamber 3 by a small amount of leakage until the pressure of the two oil chambers is equal. Among them, by providing the oil hole 2a1 at one end of the inner ring, the contact area between the lubricating oil and the oil seal 2a2b is increased.

[0026] In addition, the first oil chamber 3 is formed by the cooperation of the sealing retaining ring 7 and the bearing 8 with the inner ring 2a, and the first oil chamber 3 is connected to the second oil chamber 5 only through the oil hole 2a1 on the side wall of the inner ring 2a. While the rotation center of the output shaft 1b1 is ensured by the bearing 8, it is sealed by the multiple skeleton seals 2a2 to prevent the external liquid from entering the second oil chamber 5, thereby improving the service life.

[0027] In order to extend the service life of the skeleton seal 2a2, fluororubber material is used to improve the heat resistance and wear resistance, and a special coating is sprayed on the lip of the skeleton seal 2a2 to reduce the friction coefficient. In addition, ceramic spraying or tungsten carbide spraying and other processes are used on the output shaft to improve the hardness and wear resistance, and the surface is polished to improve the roughness, reduce the friction coefficient, and thus reduce the heat generation. It is worth mentioning that the skeleton seal 2a2 located at the front end of the first oil chamber 3 adopts a multi-lip edge setting, and lubricating oil is applied to the lip to isolate water. Due to the presence of grease and lubricating oil in the first cavity, the lubrication effect is good and the heat generation is small. Example

[0028] like Figure 5 As shown, the working principle of this embodiment is the same as that of the first embodiment, and both use an oil bag 6 to balance the internal and external pressures. The difference is that in this embodiment, the oil bag 6 is arranged at the bottom of the motor, and the shielding sleeve 1c is omitted between the stator 1a and the rotor 1b. The motor barrel is filled with lubricating oil, and the stator 1a and the rotor 1b are immersed in the lubricating oil.

[0029] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0030] Although this article uses more terms such as 1, motor barrel; 1a, stator; 1b, rotor; 1b1, output shaft; 1c, shielding sleeve; 2, motor upper cover; 2a, inner ring; 2a1, oil hole; 2a2, skeleton seal; 2a2a, water seal; 2a2b, oil seal; 2b, outer ring; 2c, interval; 2d, connecting part; 3, first oil chamber; 4, motor lower cover; 5, second oil chamber; 6, oil bag; 6a, balance rubber; 6a1, pressurized space; 6b, locking ring; 6c, clamping ring; 6d, connecting hole; 7, sealing ring; 8, bearing, etc., it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A high-speed motor for a water pump, comprising a motor barrel (1) and a motor upper cover (2), wherein an output shaft (1b1) is arranged in the motor barrel (1), characterized in that: The output shaft (1b1) is sleeved with two skeleton seals (2a2) located in the motor upper cover (2); the high-speed motor is divided into a first oil chamber (3) and a second oil chamber (5) by the skeleton seals (2a2); one end of the output shaft (1b1) passes through the first oil chamber (3); the skeleton seal (2a2) comprises a water seal (2a2a) and an oil seal (2a2b) in line contact with the output shaft (1b1); the first oil chamber (3) and the second oil chamber (5) are both filled with lubricating oil; the high-speed motor is provided with an oil sac (6); the oil sac (6) is connected to the second oil chamber (5) and is used to balance the pressure of the second oil chamber (5) and the outside.

2. The high-speed water pump motor according to claim 1, characterized in that: The motor upper cover (2) comprises an inner ring (2a) and an outer ring (2b), wherein the outer ring (2b) cooperates with the side wall of the motor barrel (1) to form a second oil chamber (5), and the two skeleton seals (2a2) cooperate with the inner wall of the inner ring (2a) to enclose a first oil chamber (3).

3. The high-speed water pump motor according to claim 2, characterized in that: An output shaft (1b1) capable of passing through the motor cover (2) from top to bottom is arranged in the second oil chamber (5); the two skeleton seals (2a2) are sleeved on the output shaft (1b1); the oil seal is located at the lower end, and the water seal is located at the upper end of the motor cover (2).

4. The high-speed water pump motor according to any one of claims 1 to 3, characterized in that: A sealing retaining ring (7) is provided above one of the skeleton sealing members (2a2) located at the top of the motor upper cover (2), and a wear-resistant coating is provided on the inner side of the sealing retaining ring (7), and the wear-resistant coating is in direct contact with the output shaft (1b1).

5. The high-speed water pump motor according to claim 4, characterized in that: A certain amount of air remains in the first oil chamber (3).

6. The high-speed water pump motor according to claim 5, characterized in that: The oil bag (6) is located on the upper end surface of the motor upper cover (2) and is embedded between the inner ring (2a) and the outer ring (2b).

7. The high-speed water pump motor according to claim 5, characterized in that: The oil bag (6) is located at the bottom of the motor, and cooperates with the motor barrel (1) and the motor upper cover (2) to form a second oil chamber (5).

8. The high-speed water pump motor according to claim 1, characterized in that: When a pressure difference exists between the first oil chamber (3) and the second oil chamber (5), the lubricating oil in the second oil chamber (5) leaks into the first oil chamber (3) through the oil seal (2a2b) until the pressures in the first oil chamber (3) and the second oil chamber (5) are equal.

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