A heat dissipation structure of a deep-well pump motor assembly

Abstract

The application provides a heat dissipation structure of a deep-well pump motor assembly and belongs to the technical field of deep-well pumps. The heat dissipation structure of the deep-well pump motor assembly solves the problem of how to enhance the heat dissipation effect of the deep-well pump in a sealed state. In the heat dissipation structure of the deep-well pump motor assembly, the journal of the rotor shaft is rotatably connected to the end cover assembly, the journal of the rotor shaft is rotatably connected to the stator shield, there is a gap between the end of the stator shield and the end cover assembly, the inner wall of the motor shell between the stator shield and the end cover assembly is a heat dissipation side wall, the end of the stator shield, the end cover assembly and the heat dissipation side wall form a heat dissipation cavity, and a circulation channel for circulating the cooling liquid is formed in the heat dissipation cavity and the inner cavity of the stator shield. In the scheme, the stator shield, the end cover assembly and the heat dissipation side wall form the heat dissipation cavity in the motor shell, so that the heat dissipation area in the heat dissipation cavity is large, the cooling liquid can rapidly reduce the temperature, and the heat generated in the rotor shaft can be easily taken away.

Description

Technical Field

[0001] This invention relates to the field of deep well pump technology, and specifically to a heat dissipation structure for a deep well pump motor assembly. Background Technology

[0002] Deep well pumps mainly consist of a motor assembly and a pump. They are pumps that are immersed in underground water wells to draw and transport water. They are widely used in farmland irrigation and drainage, industrial and mining enterprises, urban water supply and drainage, and sewage treatment.

[0003] Deep well pumps operate by driving an impeller structure through a motor assembly to pump water. In shielded deep well pumps, the motor stator is fixed between the shielding sleeve and the motor housing. When the motor rotates at high speed, a large amount of heat is generated at the shielding sleeve and between the motor shaft and bearings, leading to excessively high internal operating temperatures. To address the heat dissipation problem in the motor assembly, existing technology uses coolant inside the motor. However, in actual use, the coolant temperature remains high after it rises because there is no optimal heat dissipation structure inside the motor. Therefore, it does not effectively dissipate heat from the motor's hot components, affecting the motor's performance. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a heat dissipation structure for a deep well pump motor assembly. The technical problem to be solved by this invention is: how to enhance the heat dissipation effect of a deep well pump in a sealed state.

[0005] The objective of this invention can be achieved through the following technical solution: A heat dissipation structure for a deep well pump motor assembly, comprising a motor housing, wherein a stator, a rotor, and a rotor shaft with blind holes are disposed within the motor housing, characterized in that the rotor is sleeved outside the rotor shaft, and a stator shielding sleeve is also disposed within the motor housing to isolate the stator from coolant, an end cap assembly is disposed at the end of the motor housing, a first journal of the rotor shaft is rotatably connected to the end cap assembly, a second journal of the rotor shaft is rotatably connected to the stator shielding sleeve, a gap exists between the second end of the second journal of the rotor shaft and the bottom of the stator shielding sleeve, a gap exists between the end of the stator shielding sleeve and the end cap assembly, and the inner wall of the motor housing located between the stator shielding sleeve and the end cap assembly is a heat dissipation sidewall, the end of the stator shielding sleeve, the end cap assembly, and the heat dissipation sidewall form a heat dissipation cavity, a water outlet is also disposed on the rotor shaft, the water outlet is connected to the heat dissipation cavity, and a circulation channel for circulating coolant is formed within the rotor shaft, the heat dissipation cavity, and the inner cavity of the stator shielding sleeve.

[0006] In this design, the components inside the motor housing are sealed. Coolant is installed inside the motor housing and the stator shield. Because the stator contains high-voltage coils, it is isolated from the coolant by the stator shield. During high-speed rotation, the motor generates a large amount of heat on the stator shield. Due to the limited space between the ends of the rotor shaft journal and the bottom of the stator shield, there is less coolant in these areas, leading to rapid temperature rise. Therefore, the coolant needs to circulate within the rotor shaft, the heat dissipation cavity, and the stator shield. This allows the coolant at the bottom of the stator shield to enter the heat dissipation cavity for cooling, thus reducing the temperature in the heat dissipation cavity. Low-temperature coolant circulates into the bottom of the stator shield sleeve. Within the heat dissipation cavity, the motor housing and end cover assembly are in direct contact with water. Therefore, both the heat dissipation sidewalls and end cover assembly have excellent thermal conductivity. The stator shield sleeve, end cover assembly, and heat dissipation sidewalls form a heat dissipation cavity within the motor housing, resulting in a large heat dissipation area and increased coolant flow rate. Within this cavity, the coolant rapidly lowers its temperature, easily carrying away heat generated in the stator shield sleeve and rotor shaft. This provides excellent heat dissipation for the bottom, sidewalls, and rotor shaft of the stator shield sleeve, promoting normal motor operation.

[0007] In the aforementioned heat dissipation structure of the deep well pump motor assembly, the end cover assembly includes a base and a base end cover mounted on the base. The base is located at the end of the motor housing and is fixedly connected to it. The journal of the rotor shaft is rotatably connected to the base end cover. The water outlet is located inside the base end cover, and the base end cover has a water passage hole. The water outlet communicates with the heat dissipation cavity through the water passage hole. When the rotor shaft rotates, it can throw the coolant from the water outlet and through the water passage hole into the heat dissipation cavity. The water passage hole being located inside the base end cover allows for more thorough contact between the coolant, the base end cover, and the heat dissipation sidewall, increasing the heat dissipation effect of the coolant within the heat dissipation cavity.

[0008] In the heat dissipation structure of the aforementioned deep well pump motor assembly, water permeable holes are also provided on the shaft wall of the rotor shaft. These water permeable holes increase the flow rate of the coolant, thereby improving the cooling efficiency of the coolant on the rotor shaft.

[0009] In the heat dissipation structure of the aforementioned deep well pump motor assembly, a sealing element and a one-way valve are provided on the end cover of the base. The sealing element is sleeved on the rotor shaft. The sealing element seals the coolant inside the motor housing. When the coolant inside the motor housing becomes too hot due to increased temperature, the coolant can pass through the sealing element into the water, thus protecting the deep well pump motor. The one-way valve filters the water to remove impurities.

[0010] In the aforementioned heat dissipation structure of the deep well pump motor assembly, the base and base end cover are made of plastic or metal. Making the base and base end cover of plastic reduces the cost of the deep well pump. However, when the base and base end cover are made of plastic, the heat dissipation effect of the base end cover is reduced, while the heat dissipation sidewall ensures the heat dissipation effect of the heat dissipation cavity.

[0011] In the heat dissipation structure of the deep well pump motor assembly described above, a bearing housing is provided inside the stator shield sleeve, and a sliding bearing and a rolling bearing I are provided inside the bearing housing. The rotor shaft journal II is mounted on the sliding bearing and the rolling bearing I, and a rolling bearing II is mounted on the end cover of the housing. The rotor shaft journal I is mounted on the rolling bearing II. When the deep well pump is running, it is in a vertical position, with the rotor shaft journal I located above and the rotor shaft journal II located below. The rotor shaft will move vertically. The sliding bearing reduces friction loss and surface wear during rotor shaft movement. Since the sliding bearing and the rolling bearing I are in contact, heat is generated between the sliding bearing and the rolling bearing I when the rotor shaft rotates at high speed. Furthermore, due to the low pressure of the coolant at the outlet hole caused by rotation, the coolant in the rotor shaft journal II moves towards the rotor shaft journal I. The higher-temperature coolant enters the heat dissipation cavity after passing through the outlet hole. After cooling down, the coolant in the heat dissipation cavity returns to the end of the rotor shaft journal II, thus cooling the sliding bearing, the rolling bearing I, and the bottom of the stator shield sleeve.

[0012] In the heat dissipation structure of the aforementioned deep well pump motor assembly, a plastic sleeve is also provided on the rotor shaft. The plastic sleeve prevents the protruding part of the rotor shaft from impacting the sliding bearing two when the rotor shaft moves axially, thus providing a buffering effect for the sliding bearing two.

[0013] In the heat dissipation structure of the deep well pump motor assembly described above, the stator shielding sleeve includes stator shielding sleeve one and stator shielding sleeve two. The stator shielding sleeve one and stator shielding sleeve two are connected by welding. The stator shielding sleeve one is located at the end of the stator shielding sleeve and is fixedly connected to the inner wall of the motor housing.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1. This solution involves welding the shielding sleeve to the inner wall of the motor housing, forming a heat dissipation cavity at the end of the stator shielding sleeve, the end cover of the base, and the heat dissipation side wall. This allows the inner wall of the motor housing and the end cover of the base to both play a role in heat conduction, increasing the heat dissipation area of ​​the heat dissipation cavity and improving its heat dissipation effect.

[0016] 2. This solution uses a hollow rotor shaft and water outlet holes on the rotor shaft to form a circulation channel inside the motor housing, allowing the coolant to circulate within the circulation channel, thus providing a cooling effect for the flat bearings and rolling bearings. Attached Figure Description

[0017] Figure 1 This is a cross-sectional structural diagram of the present invention.

[0018] In the diagram, 1. Motor housing; 1a. Heat dissipation sidewall; 2. Base; 3. Base end cover; 3a. One-way valve; 3b. Seal; 3c. Water passage hole; 3d. Sliding bearing II; 4. Stator shielding sleeve; 4a. Stator shielding sleeve I; 4b. Stator shielding sleeve II; 4b1. Bearing housing; 4b2. Sliding bearing; 4b3. Surface bearing I; 5. Heat dissipation cavity; 6. Rotor shaft; 6a. Journal I; 6b. Journal II; 6c. Water outlet hole; 6d. Water permeable hole; 7. Rotor; 8. Stator; 9. Plastic sleeve. Detailed Implementation

[0019] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0020] In this embodiment, the deep well pump is used to pump and transport water when immersed in water at a depth of about 100m underground. The deep well pump using this solution can enable the motor shaft to reach a speed of 10,000 r / min.

[0021] like Figure 1 As shown, the deep well pump includes a motor housing 1 made of metal. A base 2 is located at the end of the motor housing 1, and a base end cover 3 is mounted on the base 2. Both the base 2 and the base end cover 3 are made of plastic; alternatively, they can also be made of metal. The base 2 rests against the end face of the motor housing 1 and is fixed to the motor housing 1 by welding. A stator shielding sleeve 4 is installed inside the motor housing 1. The base 2, base end cover 3, motor housing 1, and stator shielding sleeve 4 form a sealed cavity filled with coolant. The motor housing 1 also contains a stator 8, a rotor 7, and a rotor shaft 6. The stator 8 is mounted on the inner wall of the motor housing 1, and the rotor 7 is mounted on the rotor shaft 6, which is a hollow structure. The stator shielding sleeve 4 includes stator shielding sleeve two 4b and stator shielding sleeve one 4a. One end of stator shielding sleeve one 4a is fixed to the inner wall of the motor housing 1 by welding, and the other end of stator shielding sleeve one 4a is connected to stator shielding sleeve two 4b. The stator 8 is located outside stator shielding sleeve two 4b, and the rotor 7 is located inside stator shielding sleeve two 4b. Stator shielding sleeve one 4a and stator shielding sleeve two 4b work together to isolate the stator 8 from the coolant.

[0022] A bearing seat 4b1 is provided at the end of the stator shielding sleeve 4b. A sliding bearing 4b2 and a plane bearing 4b3 are provided in the bearing seat 4b1. The journal 6b of the rotor shaft 6 is located inside the sliding bearing 4b2 and the plane bearing 4b3. There is a gap between the end of the journal 6b of the rotor shaft 6 and the bottom of the stator shielding sleeve 4b. A sliding bearing 3d is provided on the end cover 3 of the seat body. The journal 6a of the rotor shaft 6 is located inside the sliding bearing 3d. The shaft head of the rotor shaft 6 is located outside the motor housing 1. A toothed block is provided on the shaft head. The shaft head is used to connect with the pump shaft (not shown in the figure). A plastic sleeve 9 is also provided on the rotor shaft 6. The plastic sleeve 9 can prevent the protruding part of the rotor shaft 6 from hitting the sliding bearing 3d when the rotor shaft 6 moves axially. It can buffer the sliding bearing 3d.

[0023] A sealing element 3b and a one-way valve 3a are also provided on the end cover 3 of the base body. The sealing element 3b is sleeved on the rotor shaft 6. The sealing element 3b plays a sealing role for the coolant in the motor housing 1. When the temperature of the coolant in the motor housing 1 is too high, causing the pressure in the motor housing 1 to be too high, the coolant can enter the water through the sealing element 3b, and the water will enter the motor housing 1 through the one-way valve 3a.

[0024] In this design, there is a gap between the stator shielding sleeve 4a and the base 2. A heat dissipation sidewall 1a is also formed on the motor housing 1, located between the stator shielding sleeve 4a and the base 2. The stator shielding sleeve 4a, the base end cover 3, and the heat dissipation sidewall 1a form a heat dissipation cavity 5. A water outlet hole 6c and a water permeation hole 6d are provided on the shaft wall of the rotor shaft 6. A water passage hole 3c is provided on the base end cover 3. The water outlet hole 6c is located above the sliding bearing 3d and is connected to the heat dissipation cavity 5 through the water passage hole 3c. The water permeation hole 6d is located inside the stator shielding sleeve 4b. A circulation channel for coolant circulation is formed within the heat dissipation cavity 5 and the inner cavity of the stator shielding sleeve 4. The direction of coolant movement within the sealed cavity is shown by the arrow in the figure.

[0025] The working principle of this scheme is as follows: When the deep well pump is running, it is in a vertical position. The first journal 6a of the rotor shaft 6 is located above, and the second journal 6b of the rotor shaft 6 is located below. The rotor shaft 6 will move vertically. The sliding bearing reduces the friction loss and surface wear of the rotor shaft 6 during movement. Since the sliding bearing 4b2 and the first plane bearing 4b3 are in contact, a large amount of heat is generated between the stator shield sleeve 4, the sliding bearing 4b2 and the first plane bearing 4b3 when the rotor shaft 6 rotates at high speed. In addition, the coolant at the outlet hole 6c has a lower pressure due to rotation. At this time, the coolant in the second journal 6b of the rotor shaft 6 moves towards the first journal 6a of the rotor shaft 6. The higher temperature coolant enters the heat dissipation cavity 5 after passing through the outlet hole 6c. The coolant in the heat dissipation cavity 5 comes into contact with the inner wall of the motor housing 1 and reduces its temperature. After the coolant is cooled, it returns to the second journal 6b of the rotor shaft 6 in the second stator shield sleeve 4b, which has a cooling effect on the sliding bearing 4b2 and the first plane bearing 4b3.

[0026] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0027] Although this document frequently uses terms such as 1. motor housing; 1a. heat dissipation sidewall; 2. base; 3. base end cover; 3a. one-way valve; 3b. seal; 3c. water passage hole; 3d. sliding bearing two; 4. stator shielding sleeve; 4a. stator shielding sleeve one; 4b. stator shielding sleeve two; 4b1. bearing housing; 4b2. sliding bearing; 4b3. flat bearing one; 5. heat dissipation cavity; 6. rotor shaft; 6a. journal one; 6b. journal two; 6c. water outlet hole; 6d. water permeable hole; 7. rotor; 8. stator; 9. plastic sleeve, etc., the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this invention; interpreting them as any additional limitation would contradict the spirit of this invention.

Claims

1. A heat dissipation structure for a deep well pump motor assembly, comprising a motor housing (1), wherein a stator (8), a rotor (7), and a rotor shaft (6) with blind holes are disposed within the motor housing (1), characterized in that, The rotor (7) is sleeved outside the rotor shaft (6). The motor housing (1) is also provided with a stator shield (4) that isolates the stator (8) from the coolant. The motor housing (1) is provided with an end cover assembly. The first journal (6a) of the rotor shaft (6) is rotatably connected to the end cover assembly. The second journal (6b) of the rotor shaft (6) is rotatably connected to the stator shield (4). There is a gap between the end of the second journal (6b) of the rotor shaft (6) and the bottom of the stator shield (4). There is a gap between the end of the stator shield (4) and the end cover assembly. The inner wall of the motor housing (1) located between the stator shield (4) and the end cover assembly is a heat dissipation sidewall (1a). The end of the stator shield (4), the end cover assembly and the heat dissipation sidewall (1a) form a heat dissipation cavity (5). The rotor shaft (6) is also provided with a water outlet hole (6c), which is connected to the heat dissipation cavity (5). A circulation channel for circulating coolant is formed in the inner cavity of the rotor shaft (6), the heat dissipation cavity (5) and the stator shield sleeve (4). The end cover assembly includes a seat end cover (3). The journal (6a) of the rotor shaft (6) is rotatably connected to the seat end cover (3). The water outlet hole (6c) is located inside the seat end cover (3). The seat end cover (3) is provided with a water passage hole (3c). The water outlet hole (6c) is connected to the heat dissipation cavity (5) through the water passage hole (3c). The seat end cover (3) is provided with a sealing element (3b) and a one-way valve (3a). The sealing element (3b) is sleeved on the rotor shaft (6).

2. The heat dissipation structure of a deep well pump motor assembly according to claim 1, characterized in that, The end cap assembly includes a base (2), which is located at the end of the motor housing (1) and is fixedly connected to the motor housing (1).

3. The heat dissipation structure of a deep well pump motor assembly according to claim 1 or 2, characterized in that, The rotor shaft (6) is also provided with a water-permeable hole (6d) on its shaft wall.

4. The heat dissipation structure of a deep well pump motor assembly according to claim 3, characterized in that, The seat (2) and the seat end cap (3) are made of plastic or metal.

5. The heat dissipation structure of a deep well pump motor assembly according to claim 4, characterized in that, The stator shield sleeve (4) is provided with a bearing seat (4b1), the bearing seat (4b1) is provided with a sliding bearing (4b2) and a first flat bearing (4b3), the second journal (6b) of the rotor shaft (6) is provided on the sliding bearing (4b2) and the first flat bearing (4b3), the second sliding bearing (3d) is provided on the end cover (3), and the first journal (6a) of the rotor shaft (6) is provided on the second sliding bearing (3d).

6. The heat dissipation structure of a deep well pump motor assembly according to claim 5, characterized in that, A plastic sleeve (9) is also provided on the rotor shaft (6).

7. The heat dissipation structure of a deep well pump motor assembly according to claim 6, characterized in that, The stator shielding sleeve (4) includes a first stator shielding sleeve (4a) and a second stator shielding sleeve (4b). The first stator shielding sleeve (4a) and the second stator shielding sleeve (4b) are connected by welding. The first stator shielding sleeve (4a) is located at the end of the stator shielding sleeve (4) and is fixedly connected to the inner wall of the motor housing (1).

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