A high-speed motor for a double-oil-bladder water pump

Abstract

The present invention provides a high-speed motor with a double-oil-bag water pump, which belongs to the technical field of water pumps. It solves the problem of how to improve the sealing performance at high speed. A high-speed motor with a double-oil-bag water pump includes a motor barrel, a motor upper cover and a motor bottom shell. The motor upper cover is provided with a first oil chamber. The motor bottom shell, the motor upper cover and the motor barrel cooperate to form a second oil chamber. An output shaft with one end passing through the first oil chamber is provided in the second oil chamber. The first oil chamber and the second oil chamber are both filled with lubricating oil. Three skeleton seals are sleeved on the output shaft, one of which is an oil seal. The oil seal is located between the first oil chamber and the second oil chamber. The high-speed motor is provided with a first oil bag and a second oil bag for balancing the internal and external pressures. The first oil bag is connected to the first oil chamber, and the second oil bag is connected to the second oil chamber, so that the pressures of the two oil chambers are equal. By passing the output shaft through the skeleton seal and making the two in line contact, and filling the oil chamber with lubricating oil, wear is reduced and the sealing performance at high speed is improved.

Description

Technical Field

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

[0002] As a water-lifting machine, water pumps have long faced the core technical problem of motor seal failure. The traditional solution uses a sealing device to isolate the internal and external media of the motor, and improves the protection performance by filling anti-corrosion / lubricating media, but there is still a risk of front-end seal failure under high-pressure conditions.

[0003] The existing technology uses the structure of mechanical seals to form a viscous liquid film using an end face contact seal in conjunction with a compensation mechanism to achieve pressure adaptive sealing in dynamic sealing. However, this technology has a speed threshold limit. When the speed exceeds a certain value, the liquid film formation mechanism of the end face seal fails, resulting in leakage problems, which seriously affects the reliability and service life of 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 double-oil bag water pump high-speed motor. The technical problem to be solved by the present invention is: how to improve the sealing performance at high speed.

[0005] The objectives of the present invention can be achieved through the following technical solutions: a double oil bag water pump high-speed motor, including a motor barrel, a motor cover and a motor bottom shell, the motor cover is provided with a first oil chamber, the motor bottom shell, the motor cover and the motor barrel cooperate to form a second oil chamber, the second oil chamber is provided with an output shaft with one end passing through the first oil chamber, the first oil chamber and the second oil chamber are both filled with lubricating oil, characterized in that at least two skeleton seals are sleeved on the output shaft, one of the skeleton seals is an oil seal, the oil seal is located between the first oil chamber and the second oil chamber, the high-speed motor is provided with a first oil bag and a second oil bag for balancing the internal and external pressures, the first oil bag is connected to the first oil chamber, the second oil bag is connected to the second oil chamber, so that the pressure of the second oil chamber is equal to that of the first oil chamber.

[0006] On the basis of the existing water pump, the present application adopts an oil seal in contact with the output axis line, and forms an oil film composed of lubricating oil on the lip of the oil seal and the circumference of the output shaft. While ensuring the density effect in the rotating state, the first oil bag and the second oil bag are added to the top and the bottom of the motor, and the first oil bag and the second oil bag are connected to the first oil chamber and the second oil chamber respectively, thereby completing the real-time adjustment of the internal pressure of the motor, making the two oil chambers equal to the external pressure, reducing the influence of the pressure difference on them, and improving the sealing performance in the high-speed state.

[0007] In the above-mentioned double-oil-bag water pump high-speed motor, the motor upper cover includes an inner ring and an outer ring.

[0008] In the above-mentioned double oil bag water pump high-speed motor, there are three skeleton oil seals, and the three skeleton seals are respectively a water seal, an oil seal A and an oil seal B. The water seal and the oil seal A located between the first oil chamber and the second oil chamber cooperate with the inner ring to form the first oil chamber, and the oil seal B is located between the water seal and the oil seal A. By adding multiple skeleton seals, the sealing performance is improved, and the water outside is blocked from entering by adding a water seal, so as to prevent water from entering the oil chamber and affecting the normal use of the motor.

[0009] In the above-mentioned double-oil-bag water pump high-speed motor, the first oil bag is connected with the first oil chamber through a connecting hole, and the connecting hole is located between the oil seal A and the oil seal B.

[0010] In the above-mentioned double-oil-bag water pump high-speed motor, the second oil chamber also includes a rotor, a stator and a shielding sleeve arranged on the output shaft, and the shielding sleeve cooperates with the motor barrel to form a closed space for accommodating the stator.

[0011] In the above-mentioned double-oil-bag water pump high-speed motor, the first oil bag is located on the top of the motor upper cover.

[0012] In the above-mentioned double-oil-bag water pump high-speed motor, a sealing retainer ring and a bearing are respectively provided at the upper and lower ends of the first oil chamber, and an oil sealing retainer ring is provided between the bearing and the above-mentioned oil seal.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] 1. The present application adopts a water seal and an oil seal to contact the output axis, and fills the first oil chamber with lubricating oil, so that an oil film is formed between the skeleton seal and the output shaft to complete the sealing, and a first oil bag and a second oil bag that are deformed by the external pressure are respectively arranged on the first oil chamber and the second oil chamber, so that the pressure of the first oil chamber and the second oil chamber is equal to that of the outside world, thereby improving the sealing effect under high-speed environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a three-dimensional schematic diagram of this embodiment;

[0016] Figure 2 It is an exploded stereoscopic schematic diagram of this embodiment;

[0017] Figure 3 is a cross-sectional schematic diagram of this embodiment;

[0018] Figure 4 yes Figure 3 A partial enlarged schematic diagram of

[0019] In the figure, 1, motor barrel; 2, motor upper cover; 2a, first oil chamber; 2b, first oil bag; 2c, inner ring; 2c1, sealing retainer ring; 2c2, bearing; 2c3, oil seal retainer ring; 2c4, oil hole; 2c5, connecting hole; 2d, outer ring; 3, motor bottom shell; 3a, second oil bag; 3b, motor cable; 4, second oil chamber; 4a, output shaft; 4b, stator; 4c, rotor; 4d, shielding sleeve; 5, skeleton seal; 5a, oil seal; 5a1, oil seal A; 5a2, oil seal B; 5b, water seal; DETAILED DESCRIPTION

[0020] 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.

[0021] like Figure 1 as well as Figure 2 As shown, a double-oil-bag water pump high-speed motor comprises a motor barrel 1, a motor upper cover 2 and a motor bottom shell 3. The motor upper cover 2 and the motor bottom shell 3 are respectively located at the upper and lower ends of the motor barrel 1. An output shaft 4a is arranged in the motor barrel 1. One end of the output shaft 4a can pass through the motor upper cover 2. A sealing retaining ring 2c1 and a first oil bag 2b are also arranged on the upper end surface of the motor upper cover 2. The motor upper cover 2 comprises an inner ring 2c and an outer ring 2d. The first oil bag 2b is located between the inner ring 2c and the outer ring 2d. The sealing retaining ring 2c1 is located between the inner ring 2c and the output shaft 4a.

[0022] It is worth mentioning that Figure 2 As shown, an oil seal 5a, an oil seal retaining ring 2c3 and a bearing 2c2 are also provided in the inner ring 2c of the motor upper cover 2. The oil seal 5a, the oil seal retaining ring 2c3 and the bearing 2c2 are arranged in sequence from bottom to top along the insertion direction of the output shaft 4a. A motor cable 3b and a second oil bag 3a are provided in the motor bottom shell 3. The second oil bag 3a can be connected with the motor barrel 1. A shielding sleeve 4d is provided in the motor barrel 1, and the output shaft 4a is located in the shielding sleeve 4d.

[0023] like Figure 3 As shown, the motor cover 2 and the motor bottom shell 3 are respectively located at the upper and lower ends of the motor barrel 1, and cooperate with the motor barrel 1 to form a closed second oil chamber 4, in which a stator 4b, a rotor 4c and a shielding sleeve 4d are provided, the rotor 4c is fixed on the output shaft 4a, and the shielding sleeve 4d cooperates with the inner wall of the motor barrel 1 to form a closed space, the stator 4b is located in the closed space, and the stator 4b and the rotor 4c are separated by the shielding sleeve 4d, in addition, one end of the output shaft 4a provided with the rotor 4c passes through the first oil chamber 2a of the inner ring 2c of the motor cover 2, the first oil bag 2b located at the top of the motor cover 2 is connected to the first oil chamber 2a, and the second oil bag 3a located in the motor bottom shell 3 is connected to the second oil chamber 4 provided with the rotor 4c and the output shaft 4a.

[0024] More importantly, if Figure 4 As shown, the motor cover 2 is divided into an inner ring 2c and an outer ring 2d. Three skeleton seals 5 are arranged in the inner ring 2c of the motor cover 2. The three skeleton seals 5 are respectively located at the top water seal 5b, oil seal A5a1 and oil seal B5a2, and the first oil chamber 2a is formed by the cooperation of the water seal 5b, the oil seal A5a1 and the inner wall of the inner ring 2c. There is a certain distance between the outer wall of the inner ring 2c and the inner wall of the outer ring 2d. The first oil bag 2b is located in the above distance, and two connecting holes 2c5 are opened on the side wall of the inner ring 2c, so that the first oil chamber 2a is connected with the above distance, wherein the connecting hole 2c5 is opened between the oil seal A5a1 and the oil seal B5a2.

[0025] It is worth mentioning that a sealing retaining ring 2c1 is provided on the top of the motor upper cover 2, and a bearing 2c2 is provided at the other end. An oil sealing retaining ring 2c3 is provided above the bearing 2c2. An oil hole 2c4 is provided at the bottom of the cavity wall of the first oil chamber 2a. The oil holes 2c4 are evenly arranged along the circumference of the bearing 2c2, and a connecting groove corresponding to the oil hole 2c4 is opened on the oil sealing retaining ring 2c3. The first oil chamber 2a and the second oil chamber 4 are separated by an oil seal A5a1 located at the bottom.

[0026] In summary, the double-oil bag water pump high-speed motor of the present application is based on the existing pump motor, and the existing mechanical seal is replaced by a first oil chamber 2a composed of multiple skeleton seals 5, and the multiple skeleton seals 5 are sleeved on the output shaft 4a, so that the lip of the skeleton seal 5 is in line contact with the output shaft 4a, and by filling the first oil chamber 2a with lubricating oil, while reducing the contact area with the output shaft 4a, the wear of the output shaft 4a and the skeleton seal 5 is reduced by the lubricating oil, and the viscosity and liquid tension of the lubricating oil are used to form an oil film between the two, so as to improve the sealing performance of the output shaft 4a under high-speed rotation. Compared with the situation where mechanical seals will accelerate wear and then leak when sealing high-speed rotating equipment, the present application ensures sealing through the skeleton seal 5, and uses lubricating oil as a sealing medium to reduce the wear of the output shaft 4a and the skeleton seal 5 during rotation.

[0027] It is worth mentioning that the present application is a high-speed motor for a water pump, and is mainly used in immersed pump bodies such as submersible pumps or deep-water pumps. In this use environment, as the depth below the water pump changes, a certain pressure difference will be generated between the outside and the inside of the motor. Since the skeleton seal 5 is easily affected by the external pressure and leaks, in order to avoid the above problems, a first oil bag 2b is provided on the motor cover 2, and the first oil bag 2b is connected with the first oil chamber 2a for sealing, so that the first oil chamber 2a where the skeleton seal 5 is placed is kept equal to the external pressure to avoid leakage. In order to reduce the damage caused by the internal and external pressure difference to the connection between the motor barrel 1 and the motor cover 2 and the motor bottom shell 3, a second oil bag 3a is provided on the motor bottom shell 3. Through the deformation of the second oil bag 3a, and the second oil bag 3a is connected with the second oil chamber 4, the second oil chamber 4 can be deformed accordingly during use to adjust the internal pressure of the second oil chamber 4 and reduce the risk of damage due to excessive internal pressure.

[0028] In order to ensure the rotation center of the output shaft 4a and avoid impact on the water seal 5b during use, a bearing 2c2 is added at the bottom end of the inner ring 2c to ensure the rotation center of the output shaft through the bearing so that it can work normally.

[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 the following terms are used more frequently in this article, such as 1, motor barrel; 2, motor upper cover; 2a, first oil chamber; 2b, first oil bag; 2c, inner ring; 2c1, sealing ring; 2c2, bearing; 2c3, oil seal ring; 2c4, oil hole; 2c5, connecting hole; 2d, outer ring; 3, motor bottom shell; 3a, second oil bag; 3b, motor cable; 4, second oil chamber; 4a, output shaft; 4b, stator; 4c, rotor; 4d, shielding sleeve; 5, skeleton seal; 5a, oil seal; 5a1, oil seal A; 5a2, oil seal B; 5b, water seal, etc., the possibility of using other terms is not excluded. 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 double-oil-bag water pump, comprising a motor barrel (1), a motor upper cover (2) and a motor bottom shell (3), wherein the motor upper cover (2) is provided with a first oil chamber (2a), and the motor bottom shell (3), the motor upper cover (2) and the motor barrel (1) cooperate to form a second oil chamber (4), wherein the second oil chamber (4) is provided with an output shaft (4a) having one end passing through the first oil chamber (2a), and the first oil chamber (2a) and the second oil chamber (4) are both filled with lubricating oil, characterized in that: The output shaft (4a) is sleeved with at least two skeleton seals (5) in line contact with the output shaft (4a), one of the skeleton seals (5) being an oil seal (5a), the oil seal (5a) being located between the first oil chamber (2a) and the second oil chamber (4), the high-speed motor being provided with a first oil bag (2b) and a second oil bag (3a) for balancing internal and external pressures, the first oil bag (2b) being connected to the first oil chamber (2a), the second oil bag (3a) being connected to the second oil chamber (4), so that the pressure of the second oil chamber (4) is equal to that of the first oil chamber (2a).

2. The double oil bag water pump high-speed motor according to claim 1 is characterized in that: The motor upper cover (2) comprises an inner ring (2c) and an outer ring (2d).

3. The double oil bag water pump high-speed motor according to claim 1 is characterized in that: There are three skeleton seals (5), which are respectively a water seal (5b), an oil seal A (5a1) and an oil seal B (5a2). The water seal (5b) and the oil seal A (5a1) located between the first oil chamber (2a) and the second oil chamber (4) cooperate with the inner ring (2c) to form the first oil chamber (2a). The oil seal B (5a2) is located between the water seal (5b) and the oil seal A (5a1).

4. The double oil bag water pump high-speed motor according to claim 3 is characterized in that: The first oil bag (2b) is connected to the first oil chamber (2a) via a connecting hole (2c5), and the connecting hole (2c5) is located between the oil seal A (5a1) and the oil seal B (5a2).

5. The double oil bag water pump high-speed motor according to claim 3 is characterized in that: The second oil chamber (4) also includes a rotor (4c) arranged on the output shaft (4a), a stator (4b) and a shielding sleeve (4d); the shielding sleeve (4d) cooperates with the motor barrel (1) to form a closed space for accommodating the stator (4b).

6. The double oil bag water pump high-speed motor according to any one of claims 1 to 4, characterized in that: The first oil bag (2b) is located on the top of the motor upper cover (2).

7. The double oil bag water pump high-speed motor according to claim 1 is characterized in that: A sealing retaining ring (2c1) and a bearing (2c2) are respectively provided at the upper and lower ends of the first oil chamber (2a), and an oil sealing retaining ring (2c3) is provided between the bearing (2c2) and the oil seal (5a).

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