A high-speed motor for a water pump

Abstract

The present invention provides a high-speed motor for a water pump, mainly solving the problem of how to improve the sealing performance at high speeds. A high-speed motor for a water pump includes a motor cylinder and a motor upper cover. An output shaft is arranged inside the motor cylinder, and two skeleton seals located inside the motor upper cover are sleeved on the output shaft. The high-speed motor is separated by the above-mentioned skeleton seals to form a first oil chamber and a second oil chamber. One end of the output shaft passes through the first oil chamber. The skeleton seal includes a water seal and an oil seal that are in line contact with the output axis. Lubricating oil is filled in both the first oil chamber and the second oil chamber. An oil bladder is arranged on the high-speed motor. The oil bladder is communicated with the second oil chamber and is used to balance the pressure between the second oil chamber and the outside. By sleeving a skeleton oil seal in line contact with the output shaft and forming an oil film therebetween for sealing, and using the oil bladder to balance the pressure between the second oil chamber and the outside, the sealing effect at high rotational speeds is improved.

Description

Technical Field

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

[0002] As a device that closely combines a pump and a motor and operates underwater together, a submersible pump plays a key role in liquid transportation. In recent years, benefiting from the progress of materials science and motor control technology, variable-frequency high-speed motors are increasingly used in submersible pumps. However, with the increase in the rotational speed of the submersible pump motor, its sealing performance faces greater challenges.

[0003] Existing water pumps use mechanical seals. When operating at high speeds, the heat generation and wear of the mechanical seals are aggravated, the sealing effect and service life are greatly reduced, and external water easily enters the motor, resulting in damage to the motor. Summary of the Invention

[0004] The purpose of the present invention is to address the above problems existing in the prior art and 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 rotational speeds.

[0005] The purpose of the present invention can be achieved by the following technical solutions: A high-speed motor for a water pump includes a motor cylinder and a motor upper cover. An output shaft is provided inside the motor cylinder. It is characterized in that two skeleton seals are sleeved on the output shaft and located inside the motor upper cover. The high-speed motor is divided into a first oil chamber and a second oil chamber by the above-mentioned skeleton seals. One end of the output shaft passes through the first oil chamber. The skeleton seal includes a water seal and an oil seal that are in contact with the output axis. Lubricating oil is filled in both the first oil chamber and the second oil chamber. An oil bladder is provided on the high-speed motor, and the oil bladder is connected to the second oil chamber and is used to balance the pressure between the second oil chamber and the outside.

[0006] Based on the fact that one end of the output shaft of the existing water pump motor passes through the motor upper cover, two skeleton seals are sleeved on the output shaft in this application. By contacting the skeleton seals with the output axis, the contact area with the output shaft is reduced. Using the lubricating oil in the first oil chamber, an oil film for sealing is formed between the lip of the skeleton seal and the output shaft, avoiding dry friction between the output shaft and the skeleton seal, and thus ensuring the sealing effect at high rotational speeds. And to reduce the influence of the internal and external pressure difference on the seal, an oil bladder is provided on this motor to make the pressure in the second oil chamber equal to that of the outside.

[0007] In the above-mentioned high-speed motor for a water pump, the motor upper cover includes an inner ring and an outer ring. The outer ring and the side wall of the motor cylinder cooperate to form the second oil chamber. The two skeleton seals and the inner wall of the inner ring cooperate to enclose the first oil chamber. By arranging the skeleton seals inside the inner ring, it is convenient to install the skeleton seals.

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

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

[0010] In the above-mentioned high-speed motor of the water pump, a certain amount of air remains in the first oil chamber. By retaining a small amount of air in the first oil chamber, the overflow of lubricating oil caused by the increase in internal temperature during operation is avoided.

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

[0012] In the above-mentioned high-speed motor of the water pump, the oil bladder is located at the bottom of the motor and cooperates with the motor cylinder and the motor upper cover to enclose the second oil chamber.

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

[0014] In the above-mentioned high-speed motor of the 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 pressures of the first oil chamber and the second oil chamber are equal. When the motor is used in 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 two sides of the above-mentioned skeleton seal to have an unbalanced pressure, prompting the skeleton seal to deform, and another part of the lubricating oil in the second oil chamber enters the first oil chamber by leakage until the pressures of the two oil chambers are balanced, 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:

[0016] 1. In this application, two skeleton seals are sleeved on the output shaft of the motor, making the lips of the skeleton seals contact the output axis, reducing the contact area, lubricating and sealing through lubricating oil. While completing the sealing at high speeds, the deformation of the oil bladder under the action of the internal and external pressure difference is utilized to adjust the internal and external pressures to make them equal, so as to improve the sealing performance of the skeleton seal at high speeds. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the three-dimensional explosion diagram of the first embodiment;

[0018] Figure 2 is the half-section three-dimensional diagram of the first embodiment;

[0019] Figure 3 is the explosion sectional view of the upper cover of the motor in the first embodiment;

[0020] Figure 4 is the sectional view of the upper cover of the motor in the first embodiment;

[0021] Figure 5 is the sectional view of the second embodiment;

[0022] In the figure, 1, motor cylinder; 1a, stator; 1b, rotor; 1b1, output shaft; 1c, shielding sleeve; 2, upper cover of the motor; 2a, inner ring; 2a1, oil through hole; 2a2, skeleton seal; 2a2a, water seal; 2a2b, oil seal; 2b, outer ring; 2c, interval; 2d, connecting part; 3, first oil cavity; 4, lower cover of the motor; 5, second oil cavity; 6, oil bladder; 6a, balancing rubber; 6a1, compressed space; 6b, locking ring; 6c, pressing ring; 6d, communication hole; 7, sealing retaining ring; 8, bearing; Detailed implementation manners

[0023] The following are specific embodiments of the present invention and in combination with the attached drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments. Embodiment

[0024] As Figure 1 and Figure 2 shown, a high-speed motor for a water pump includes an upper cover 2 of the motor, a motor cylinder 1 and a lower cover 4 of the motor, and the upper cover 2 of the motor, the motor cylinder 1 and the lower cover 4 of the motor are cooperated to form the high-speed motor for the pump. Among them, a shielding sleeve 1c and an output shaft 1b1 are arranged in the motor cylinder 1, one end of the output shaft 1b1 can pass through the upper cover 2 of the motor, the upper cover 2 of the motor includes an inner ring 2a and an outer ring 2b, an oil bladder 6 is arranged between the inner ring 2a and the outer ring 2b, the oil bladder 6 includes a locking ring 6b, a pressing ring 6c and a balancing rubber 6a, the locking ring 6b and the pressing ring 6c are communicated with the oil bladder 6 through an oil through hole 2a1, and a sealing retaining ring 7 is arranged on the inner ring 2a and is cooperated with the upper cover 2 of the motor to form a first oil cavity 3.

[0025] It is worth mentioning that, as Figure 2As shown, a stator 1a, a rotor 1b, and an output shaft 1b1 are provided inside the motor cylinder 1. The output shaft 1b1 is provided 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 upper cover 2 cooperates with the shielding sleeve 1c inside the motor cylinder 1 to form a second oil chamber 5. And in the first oil chamber 3, a sealing retaining ring 7, two skeleton seals 2a2, and a bearing 8 are sequentially arranged from top to bottom. The sealing retaining ring 7 and the bearing 8 cooperate with the inner ring 2a of the motor upper cover 2 to form the first oil chamber 3. The two skeleton seals 2a2 are located in the first oil chamber 3 and are arranged at intervals.

[0026] As Figure 3 and Figure 4 shown, the sealing retaining 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 retaining ring 7 to form a relatively enclosed first oil chamber 3. An oil passing hole 2a1 is provided at one end of the inner ring 2a where the bearing 8 is installed. The oil passing hole 2a1 is used to communicate the first oil chamber 3 and the second oil chamber 5. The second oil chamber 5 is formed by the cooperation of the motor upper cover 2 and the shielding sleeve 1c inside the motor cylinder 1. Among them, the second oil chamber 5 and the first oil chamber 3 are filled with lubricating oil.

[0027] More importantly, as Figure 4 shown, the inner ring 2a and the outer ring 2b are integrally connected through a connecting portion 2d to form the motor upper cover 2. An oil bladder 6 is provided in the space 2c between the inner ring 2a and the outer ring 2b of the motor upper cover 2. The oil bladder 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 communication holes 6d on the locking ring 6b and the pressing ring 6c to form a pressure-receiving space 6a1 and is connected to the outside. And a sealing retaining ring 7 is provided at the top of the inner ring 2a. The side of the sealing retaining ring 7 in contact with the output shaft 1b1 has a wear-resistant coating.

[0028] In summary, on the basis of the existing pump motor, the high-speed motor of the present application replaces the existing mechanical seal with the first oil chamber 3 composed of multiple skeleton seals 2a2, and fills lubricating oil in the first oil chamber 3 and the second oil chamber 5. The lubricating oil is used to lubricate the contact position between the skeleton seal 2a2 and the output shaft 1b1, reduce the wear generated during high-speed rotation, and form an oil film between the skeleton seal 2a2 and the output shaft 1b1 through the viscosity and tension of the lubricating oil to improve the high-speed sealing performance of the skeleton seal 2a2 for the output shaft 1b1. Compared with the situation where the mechanical seal will accelerate wear when sealing a high-speed rotating device, the present application lubricates the part of the lip of the skeleton seal 2a2 in contact with the output shaft by means of line contact and filling with lubricating oil, further reducing the possibility of wear.

[0029] Among them, since the skeleton seal 2a2 seals the output shaft by the way of line contact and lubricating oil to form an oil film, it is easy to be affected by the internal and external pressure difference during use, resulting in deformation at the position in contact with the output shaft 1b1. To avoid leakage caused by deformation, an oil bladder 6 is provided between the first oil chamber 3 and the motor upper cover 2. A communication hole 6d is provided on the upper end surfaces of the locking ring 6b and the pressing ring 6c, so that external water or other liquids enter the pressure-receiving space 6a1 formed by bending in the balance rubber 6a, and force the pressure-receiving space 6a1 to deform. Furthermore, the water pressure outside is used to make the pressure inside the motor equal to the outside by promoting the deformation of the balance rubber 6a.

[0030] More importantly, when the motor runs for the first time, to avoid the problem of imbalance between the internal and external pressures caused by the temperature rise of the motor during operation, this application sets an oil bladder 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 oil bladder 6 is used to adjust the pressure difference between the second oil chamber 5 and the outside. Since a certain amount of air is retained in the first oil chamber 3, during the high-speed movement of the motor, the pressure in the first oil chamber 3 is driven to rise. 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 with the discharged position until the internal and external pressures are equal, completing the dynamic adjustment of the internal pressure of the motor.

[0031] 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 pressure in the second oil chamber is equal to the outside pressure, and the pressure in the second oil chamber is higher than that in the first oil chamber formed by the cooperation of the inner ring and the two skeleton seals. Since an oil through-hole 2a1 is provided at the lower end of the inner ring to allow 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 through-hole 2a1. Utilizing the characteristic that the skeleton seal 2a2 will deform due to the pressure difference on both sides, part of the lubricating oil in the second oil chamber 5 can enter the first oil chamber 3 through a small amount of leakage until the pressures in the two oil chambers are equal. Among them, by providing an oil through-hole 2a1 at one end of the inner ring, the contact area between the lubricating oil and the oil seal 2a2b is increased.

[0032] 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. Only the oil through-hole 2a1 on the side wall of the inner ring 2a connects the first oil chamber 3 with the second oil chamber 5. While ensuring the rotation center of the output shaft 1b1 through the bearing 8, multiple skeleton seals 2a2 are used to seal it, preventing the liquid infiltrated from the outside from entering the second oil chamber 5 and improving the service life.

[0033] Among them, to improve the service life of the skeleton seal 2a2, a fluororubber material is used to improve the temperature resistance and wear resistance. A special coating is sprayed on the lip of the skeleton seal 2a2 to reduce the friction coefficient. Moreover, processes such as spraying ceramics or tungsten carbide are adopted on the output shaft to improve the hardness and wear resistance, and the surface is polished to improve the roughness and reduce the friction coefficient, thereby reducing the heat generation. It is worth mentioning that the skeleton seal 2a2 located at the front end of the first oil chamber 3 is provided with multiple lips, and lubricating oil is applied to the lips to isolate water. Due to the presence of the grease and the lubricating oil in the first chamber, the lubrication effect is good and the heat generation is small. Embodiment

[0034] As Figure 5 shown, the working principle of this embodiment is the same as that of the first embodiment, and both use the oil bladder 6 to balance the internal and external pressures. The difference is that in this embodiment, the oil bladder 6 is arranged at the bottom of the motor, and the shield sleeve 1c is omitted between the stator 1a and the rotor 1b. The motor cylinder is filled with lubricating oil, and the stator 1a and the rotor 1b are immersed in this lubricating oil.

[0035] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0036] Although terms such as 1, motor cylinder; 1a, stator; 1b, rotor; 1b1, output shaft; 1c, shield sleeve; 2, motor upper cover; 2a, inner ring; 2a1, oil passage hole; 2a2, skeleton seal; 2a2a, water seal; 2a2b, oil seal; 2b, outer ring; 2c, spacer; 2d, connecting part; 3, first oil chamber; 4, motor lower cover; 5, second oil chamber; 6, oil bladder; 6a, balancing rubber; 6a1, pressurized space; 6b, locking ring; 6c, pressing ring; 6d, communication hole; 7, sealing ring; 8, bearing are used more frequently in this article, the possibility of using other terms is not excluded. Using these terms is only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation 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 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). The first oil chamber (3) and the second oil chamber (5) are connected through an oil hole (2a1). One end of the output shaft (1b1) passes through the first oil chamber (3). The skeleton seal (2a2) includes 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 bag (6). The oil bag (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 cover (2) comprises an inner ring (2a) and an outer ring (2b), wherein the outer ring (2b) cooperates with a shielding sleeve (1c) in 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 form 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 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 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 there is a pressure difference 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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