Water pipe connecting device of permanent magnet roller motor stator water cooling structure
By using flexible water pipe connection device of expansion joint corrugated pipe in permanent magnet drum motor, the water sealing problem caused by stress deformation of the stator bracket is solved, and higher safety and reliability are achieved, and potential failures and accidents are avoided.
Patent Information
- Application Number
- CN202421954140.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-13
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-08-13
AI Technical Summary
When operating, the permanent magnet drum motor stator bracket causes stress deformation due to magnetic tension and shear stress, resulting in relative displacement and gaps at the connection with the motor shaft, destroying the waterway sealing, which may lead to cooling water leakage and more serious motor failures.
A flexible water pipe connection device including expansion joint corrugated pipe is adopted to replace the traditional middle section of stainless steel pipe. Through the elastic compensation of expansion joint corrugated pipe, it adapts to the displacement and deformation of the stator bracket and the motor shaft to maintain the water sealing.
It effectively avoids water leakage in the waterway, improves the safety performance and operating reliability of the permanent magnet drum motor, prevents faults or accidents that may be caused by connection failure, and ensures the stable operation of the motor.
Smart Images
Figure CN222798452U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of motor water cooling, in particular to a water pipe connecting device of a permanent magnet drum motor stator water cooling structure. Background Art
[0002] The permanent magnet drum motor is characterized by a fixed inner ring and a rotating outer ring. The inner ring components usually include the motor shaft, stator bracket, stator punching, etc., and the outer ring components usually include the drum skin, end cover, bearing cover, magnetic steel (permanent magnet), etc. In order to reduce the heat generated when the motor is running, the stator needs to be water-cooled. The water is introduced from the motor shaft, then transferred to the stator bracket to take away the heat, and then led out from the motor shaft to achieve the effect of cooling the motor.
[0003] like Figure 1 As shown, the stator bracket is a rigid structure as a whole. The motor shaft and the stator bracket are connected by a key. A stainless steel pipe is welded between the motor shaft and the stator bracket to form a cooling passage. When the motor is running, the stator bracket is subjected to magnetic tension and shear stress in the circumferential direction. The stator bracket will produce stress deformation after being subjected to force. Since both ends of the motor shaft are firmly fixed on the shaft seat and its position is relatively fixed, the deformation of the stator bracket will inevitably produce relative displacement with the motor shaft. Due to the rigid characteristics of welding, when the stainless steel pipe is subjected to tension or shear force caused by deformation, the weld may crack and form gaps. These gaps not only destroy the sealing of the waterway, causing cooling water leakage, but may also cause more serious motor failures and even threaten the safety of operators and property. Utility Model Content
[0004] The purpose of the utility model is to provide a water pipe connection device for the water cooling structure of the stator of a permanent magnet drum motor, which changes the rigid connection into a flexible connection, can compensate for the displacement and deformation generated by the stator bracket and the motor shaft, and avoid water leakage in the water channel.
[0005] To achieve the above-mentioned purpose, the present application proposes a water pipe connection device for a permanent magnet drum motor stator water cooling structure, comprising:
[0006] A water inlet pipe, the water inlet pipe having a first water inlet stainless steel pipe, a first expansion joint bellows and a second water inlet stainless steel pipe connected in sequence, wherein the first water inlet stainless steel pipe is connected to the water inlet channel of the motor shaft, and the second water inlet stainless steel pipe is connected to the cooling water inlet of the stator bracket;
[0007] The water outlet pipe comprises a first water outlet stainless steel pipe, a second expansion joint bellows and a second water outlet stainless steel pipe which are connected in sequence, wherein the first water outlet stainless steel pipe is connected to the water outlet channel of the motor shaft, and the second water outlet stainless steel pipe is connected to the cooling water outlet of the stator bracket.
[0008] Furthermore, the first expansion joint bellows is welded between the first water inlet stainless steel pipe and the second water inlet stainless steel pipe.
[0009] Furthermore, the second expansion joint bellows is welded between the first water outlet stainless steel pipe and the second water outlet stainless steel pipe.
[0010] Furthermore, when the motor shaft and the stator bracket generate relative displacement, the first expansion joint bellows and the second expansion joint bellows compensate for the displacement.
[0011] Furthermore, a serpentine water channel is provided on the stator bracket, and two ends of the serpentine water channel are respectively a cooling water inlet and a cooling water outlet.
[0012] Furthermore, the number of layers of the first expansion joint bellows and the second expansion joint bellows is greater than or equal to 2, and the thickness of a single-layer pipe wall is greater than or equal to 0.3 mm.
[0013] Furthermore, the water inlet channel and the water outlet channel of the motor shaft are both L-shaped.
[0014] Furthermore, the first water inlet stainless steel pipe is connected to the water inlet channel of the motor shaft by welding, and the first water outlet stainless steel pipe is connected to the water outlet channel of the motor shaft by welding.
[0015] Furthermore, the second water inlet stainless steel pipe is connected to the cooling water inlet of the stator bracket by welding, and the second water outlet stainless steel pipe is connected to the cooling water outlet of the stator bracket by welding.
[0016] Furthermore, the motor shaft and the stator bracket are connected by a key.
[0017] Compared with the prior art, the above technical solution adopted by the utility model has the following advantages: the present application adopts an expansion joint bellows to replace the middle section of the stainless steel pipe, realizing the transformation of the waterway from a rigid connection to a flexible connection. This transformation can effectively deal with the displacement and deformation of the stator bracket and the motor shaft caused by operation, and avoid waterway leakage problems through elastic compensation of the expansion joint bellows. Therefore, the safety performance and operating reliability of the permanent magnet drum motor are significantly improved, and the failure or accident that may be caused by connection failure is effectively prevented, ensuring the stable operation of the motor. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a cross-sectional view and an end view of the water pipe connection position in the prior art;
[0019] Figure 2 This is a cross-sectional and end view of the water pipe connection device of this application;
[0020] Figure 3 This is a partial enlarged view of the water pipe connection device of this application;
[0021] Among them: 1. the first expansion joint bellows, 2. the second expansion joint bellows, 3. the motor shaft, 4. the serpentine waterway, 5. the stator bracket, 6. the second water inlet stainless steel pipe, 7. the first water inlet stainless steel pipe, 8. the water inlet channel. DETAILED DESCRIPTION
[0022] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.
[0023] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.
[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined. "Several" means one or more, unless otherwise clearly and specifically defined.
[0025] In the description of the present application, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0026] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0027] See also Figure 2-3This embodiment provides a water pipe connection device for a permanent magnet drum motor stator water cooling structure, including:
[0028] A water inlet pipe, the water inlet pipe having a first water inlet stainless steel pipe, a first expansion joint bellows and a second water inlet stainless steel pipe connected in sequence, wherein the first water inlet stainless steel pipe is connected to the water inlet channel of the motor shaft, and the second water inlet stainless steel pipe is connected to the cooling water inlet of the stator bracket;
[0029] The water outlet pipe comprises a first water outlet stainless steel pipe, a second expansion joint bellows and a second water outlet stainless steel pipe which are connected in sequence, wherein the first water outlet stainless steel pipe is connected to the water outlet channel of the motor shaft, and the second water outlet stainless steel pipe is connected to the cooling water outlet of the stator bracket.
[0030] As a preferred implementation scheme provided in this embodiment, the first expansion joint bellows is welded between the first water inlet stainless steel pipe and the second water inlet stainless steel pipe; the second expansion joint bellows is welded between the first water outlet stainless steel pipe and the second water outlet stainless steel pipe; and the number of layers of the first expansion joint bellows and the second expansion joint bellows is greater than or equal to 2, and the thickness of the single-layer pipe wall is greater than or equal to 0.3 mm. When the motor shaft and the stator bracket produce relative displacement, the first expansion joint bellows and the second expansion joint bellows compensate for the displacement.
[0031] As a preferred implementation provided by this embodiment, the first water inlet stainless steel pipe is welded to the water inlet channel of the motor shaft, and the first water outlet stainless steel pipe is welded to the water outlet channel of the motor shaft. The second water inlet stainless steel pipe is welded to the cooling water inlet of the stator bracket, and the second water outlet stainless steel pipe is welded to the cooling water outlet of the stator bracket. The motor shaft and the stator bracket are connected by a key.
[0032] When the motor is running, the stator bracket is subjected to magnetic pulling force and shear stress in the circumferential direction, so the stator bracket will produce stress deformation after being stressed. Since both ends of the motor shaft are fixed on the shaft seat, a relative displacement occurs between the motor shaft and the stator bracket. Since the first expansion joint bellows and the second expansion joint bellows can compensate for a certain amount of displacement, the stainless steel pipe weld is prevented from being stressed, ensuring that there is no water leakage here. A serpentine waterway is used inside the stator bracket, and the water inlet and outlet channels of the motor shaft are L-shaped. After being connected to the expansion joint bellows through a stainless steel pipe, a closed waterway is formed inside the motor to achieve the purpose of heat dissipation.
[0033] The effect of this embodiment is that, compared with the traditional water pipe connection, the use of the bellows expansion joint can improve the safety and reliability of the drum motor and avoid the occurrence of failures or accidents.
[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims
1. A water pipe connection device for a permanent magnet drum motor stator water cooling structure, characterized in that: include: A water inlet pipe, the water inlet pipe having a first water inlet stainless steel pipe, a first expansion joint bellows and a second water inlet stainless steel pipe connected in sequence, wherein the first water inlet stainless steel pipe is connected to the water inlet channel of the motor shaft, and the second water inlet stainless steel pipe is connected to the cooling water inlet of the stator bracket; The water outlet pipe comprises a first water outlet stainless steel pipe, a second expansion joint bellows and a second water outlet stainless steel pipe which are connected in sequence, wherein the first water outlet stainless steel pipe is connected to the water outlet channel of the motor shaft, and the second water outlet stainless steel pipe is connected to the cooling water outlet of the stator bracket.
2. According to claim 1, a water pipe connection device for a permanent magnet drum motor stator water cooling structure is characterized in that: The first expansion joint bellows is welded between the first water inlet stainless steel pipe and the second water inlet stainless steel pipe.
3. According to claim 1, a water pipe connection device for a permanent magnet drum motor stator water cooling structure is characterized in that: The second expansion joint bellows is welded between the first water outlet stainless steel pipe and the second water outlet stainless steel pipe.
4. The water pipe connection device of the permanent magnet drum motor stator water cooling structure according to claim 1, characterized in that: When the motor shaft and the stator bracket generate relative displacement, the first expansion joint bellows and the second expansion joint bellows compensate for the displacement.
5. The water pipe connection device of the permanent magnet drum motor stator water cooling structure according to claim 1, characterized in that: The stator bracket is provided with a serpentine water channel, and two ends of the serpentine water channel are respectively a cooling water inlet and a cooling water outlet.
6. The water pipe connection device of the permanent magnet drum motor stator water cooling structure according to claim 1, characterized in that: The number of layers of the first expansion joint bellows and the second expansion joint bellows is greater than or equal to 2, and the thickness of a single-layer pipe wall is greater than or equal to 0.3 mm.
7. The water pipe connection device of the permanent magnet drum motor stator water cooling structure according to claim 1, characterized in that: The water inlet channel and the water outlet channel of the motor shaft are both L-shaped.
8. The water pipe connection device of the permanent magnet drum motor stator water cooling structure according to claim 1, characterized in that: The first water inlet stainless steel pipe is connected to the water inlet channel of the motor shaft by welding, and the first water outlet stainless steel pipe is connected to the water outlet channel of the motor shaft by welding.
9. The water pipe connection device of the permanent magnet drum motor stator water cooling structure according to claim 1, characterized in that: The second water inlet stainless steel pipe is connected to the cooling water inlet of the stator bracket by welding, and the second water outlet stainless steel pipe is connected to the cooling water outlet of the stator bracket by welding.
10. The water pipe connection device of the permanent magnet drum motor stator water cooling structure according to claim 1, characterized in that: The motor shaft and the stator bracket are connected by a key.