A wind turbine semi-direct drive generator with evaporative cooling structure

Abstract

The present invention relates to a wind power semi-direct drive generator with an evaporative cooling structure, including a base and a generator assembly, wherein the generator assembly is fixedly mounted in the inner cavity of the base, the generator assembly includes a stator component with a winding assembly and a rotor component with a generator shaft, and the stator component is fixedly mounted in the inner cavity of the base, the rotor component is rotatably arranged in the inner cavity of the base, and the stator component and the rotor component interact with each other. The technical solution of the present application has a reasonable structure, and constructs a simple, economical and reliable evaporative cooling structure, which enables the evaporative cooling technology to be applied to horizontal axis generators, while greatly reducing the cost of the cooling system. On this basis, no major changes are made to the structure of the motor itself, ensuring that the performance of the motor itself is not affected, and at the same time, it can cooperate with air cooling for double cooling, and the combination of the two ensures the reliability of the motor during operation.

Description

Technical Field

[0001] The invention relates to a generator device, in particular to a wind power semi-direct drive generator with an evaporative cooling structure. Background Art

[0002] There are three main ways to cool large or extra-large motor windings in the existing technology: direct air cooling, water cooling, and evaporative cooling. Air-cooled units are cooled by blowing air outside the winding insulation, so the cooling effect is poor, which limits the development of units to larger capacity; water-cooled units use water pumps to pressurize water to flow in the hollow conductor of the winding to take away heat, so the cooling effect is good, but once the cooling water leaks, it often causes a short circuit, forcing the unit to shut down for maintenance, causing significant economic losses. Obviously, the current air cooling and water cooling technologies cannot meet the cooling and safety requirements of large and extra-large generator sets. It is necessary to research and develop new cooling media and cooling technologies, and improve the reliability of safe operation.

[0003] The evaporative cooling technology independently developed by my country uses the principle of heat absorption by vaporization of evaporative cooling medium to cool the motor. Compared with traditional cooling methods, it has unique advantages. Evaporative cooling technology uses latent heat of vaporization to absorb heat, has high cooling efficiency, and is uniform and comprehensive in cooling. This method uses evaporative cooling medium with high insulation, suitable boiling point, non-flammable and non-explosive, safe, stable, non-toxic and environmentally friendly to ensure the safe and stable operation of the motor. Among them, the internal cooling evaporative cooling technology has been successfully applied to hydro-generators. Natural circulation can be formed by utilizing the structural characteristics of the motor (stator winding of a vertical turbine) and the pressure difference caused by the change in density after liquid vaporization. The principle of the system is as follows: the cooling medium in the hollow conductor of the winding absorbs heat, vaporizes at room temperature, and forms a gas-liquid two-phase mixture in the channel. The mixed density is less than the density of the unheated liquid in the return pipe. Under the action of gravity acceleration, the static pressure head in the two pipes is different, which produces a pressure difference. This is the power of self-circulation and becomes the flow pressure head. It uses the heat absorbed by the medium to do work and promote fluid circulation without external power. The flow head overcomes various pressure losses in the circulation loop and maintains normal circulation. The pressure head and the total resistance are balanced. As the motor load changes, the loss changes, the flow rate of the fluid changes, and the flow velocity of the working fluid changes accordingly. The flow head and the total resistance loss reach a new balance under the new conditions, which can automatically adapt to the needs of motor cooling.

[0004] However, because the hollow wire rods of horizontal motors are in a horizontal or nearly horizontal state, the evaporative cooling medium in the hollow conductor cannot generate circulating power through its own weight. Therefore, it is necessary to add a circulating pump and adopt a forced circulation cooling system. This forced circulation evaporative cooling system has been put into operation on horizontal thermal power units. However, this cooling system is very complex and cannot be economically mass-produced and reliably used. In short, although the evaporative cooling technology has good effects, it has not been applied in batch engineering in various motor products (especially horizontal motors). A very important reason for this is that the existing scheme requires many changes to the motor body (such as using hollow conductors, adding pipe joints, etc.). Although it can improve the cooling effect of the motor, it also reduces the economy and reliability of the motor product.

[0005] There have been many attempts to use evaporative cooling technology to improve the performance of motor products while minimizing changes to the motor itself and its economy and reliability, but there are problems that need to be solved. Summary of the invention

[0006] In order to solve the above technical problems, the purpose of the present invention is to provide a wind power semi-direct drive generator with an evaporative cooling structure, comprising a base and a generator assembly, the generator assembly is fixedly installed in the inner cavity of the base, the generator assembly comprises a stator component with a winding assembly and a rotor component with a generator shaft, and the stator component is fixedly installed in the inner cavity of the base, the rotor component is rotatably arranged in the inner cavity of the base, and the stator component interacts with the rotor component;

[0007] The stator component includes a number of stator core segments, which are arranged in an array from front to back along the motor axis to form a whole, and a cooling air path is provided between two adjacent stator core segments, and the winding assembly is arranged on each stator core segment;

[0008] The body of the machine base is located at the stator component and is evenly provided with an annular ventilation slot belt along the circumferential direction. The upper end of the body of the machine base is located on both sides of the annular ventilation slot belt and is fixedly provided with cooling fans through ventilation mounting seats. The cooling fans can be connected with the inner cavity of the machine base through the ventilation mounting seats. The cooling fans, cooling air paths and annular ventilation slot belts constitute a circulating cooling air belt.

[0009] Each stator core segment includes a number of core segment ring bodies, each core segment ring body has an evaporative cooling segment flow channel, a number of core segment ring bodies are stacked in an array from front to back along the axial direction of the motor to form a stator core segment, and the evaporative cooling segment flow channels of two adjacent core segment ring bodies are connected to each other to form an evaporative cooling annular flow channel of each stator core segment, a number of ventilation slot pads are provided between the two adjacent stator core segments, and the ventilation slot pads are arranged in an annular array along the circumferential direction, and the evaporative cooling annular flow channels of the two adjacent stator core segments can be connected through the ventilation slot pads, and when a number of stator core segments are arranged in an array from front to back along the axial direction of the motor to form a whole, the evaporative cooling annular flow channels can be connected to each other to form an evaporative cooling circuit;

[0010] The circulating cooling air belt works together with the evaporative cooling circuit to cool the inner cavity of the machine base.

[0011] Preferably, each core segmented ring body is composed of a plurality of segmented ring blocks spliced ​​in an array along the circumferential direction, each segmented ring block is composed of a plurality of sidewall punchings and a plurality of cooling punchings stacked front and back, the cooling punchings are clamped front and back by the sidewall punchings, and the cooling punchings and the sidewall punchings together constitute part of the evaporative cooling segmented flow channel;

[0012] Each stator core segment is assembled and matched with the ventilation slot pad through the retaining edge punching sheet of the core segment ring body, that is, the evaporative cooling segment flow channels of the front and rear adjacent core segment ring bodies can be connected through the ventilation slot pad.

[0013] Preferably, the outer contour structure and size of the side guard punching sheet are the same and the side guard punching sheet are both fan ring structures. The side guard punching sheet and the side guard punching sheet are both provided with an embedded full groove and a liquid-passing hole at the upper end of the sheet body, and the side guard punching sheet and the side guard punching sheet are symmetrically provided with an embedded half groove and a single liquid-passing hole at the left and right ends of the sheet body. One side of the side guard punching sheet is located at the tooth part and has a plurality of tooth cooling grooves, and one side of the side guard punching sheet is located above the tooth part and has a choke cooling groove. While the choke cooling groove is connected to the tooth cooling groove, its two ends extend to the liquid-passing hole and the single liquid-passing hole respectively, that is, one side of the side guard punching sheet constitutes a cooling surface A, and the other side constitutes a sealing surface B.

[0014] Preferably, the stator component further comprises an iron core mounting ring, through which a number of stator iron core segments can be arranged in an array from front to back along the axial direction of the motor to form a whole, and are fixedly mounted at the inner cavity annular ventilation slot belt of the base, the iron core mounting ring comprises a front pressure ring and a rear pressure ring, a number of embedding strips are evenly arranged between the front pressure ring and the rear pressure ring along the circumferential direction, and the embedding strips cooperate with the embedded full slot and the embedded half slot, a number of stator iron core segments are arranged in an array from front to back along the axial direction of the motor between the front pressure ring and the rear pressure ring, and are spaced apart by ventilation slot pads to form a cooling air path;

[0015] The front pressure ring and the rear pressure ring both have a contact surface that fits with the retaining edge punching sheet, and the front pressure ring and the rear pressure ring are both provided with an annular sealing groove group that matches with the liquid-passing counter hole and the liquid-passing single hole on the contact surface, and the ring body of the front pressure ring is also provided with an inlet and an outlet, and the inlet and the outlet are respectively connected with the corresponding annular sealing groove group, that is, the inlet and the outlet can be connected with the corresponding liquid-passing counter hole and the liquid-passing single hole;

[0016] Each segmented ring block includes two side guard punches and two cooling punches, the two side guard punches are respectively arranged at the outermost sides front and back and the outer contours of the two side guard punches overlap front and back, the two cooling punches are rotated 18° front and back and overlapped, that is, the outer contour of the embedded half groove of one cooling punch partially overlaps with the outer contour of the embedded full groove of the other cooling punch, and the outer contours of the other cooling punch and the two side guard punches overlap front and back, and the two side guard punches and the two cooling punches are overlapped front and back to form a whole.

[0017] Preferably, the front and rear end surfaces of the ventilation groove gasket are both in contact with the retaining edge punching plate, the block body of the ventilation groove gasket is provided with a connecting oil passage which is connected with the liquid-passing hole and the liquid-passing single hole, and the block body of the ventilation groove gasket is provided with a sealing ring placement groove located on the outer periphery of the connecting oil passage.

[0018] Preferably, the side edge punching sheet and the two cooling punching sheets have an included angle α between their side edge extension lines, α is 36°, and the peripheries of the side edge punching sheet and the cooling punching sheet are coated with an insulating coating.

[0019] Preferably, the inlet and the outlet are respectively located below and above the front pressure ring, and the two are arranged opposite to each other.

[0020] Preferably, a heat exchanger is fixedly installed on the upper end of the base body between the cooling fans, and the base also has an annular sealing plate that matches the base. The annular sealing plate is fixedly installed on the outer periphery of the base and located on the outer periphery of the annular ventilation groove belt. A radial air outlet cavity connected to the heat exchanger is formed between the annular sealing plate and the base.

[0021] Preferably, the base body of the machine base has annular wing plates matched with the annular sealing plates on both sides of the annular ventilation slot belt.

[0022] By means of the above scheme, the present invention has at least the following advantages:

[0023] The technical solution of this application constructs a simple, economical and reliable evaporative cooling structure, which enables the evaporative cooling technology to be applied to the horizontal axis generator, while greatly reducing the cost of the cooling system. On this basis, no major changes are made to the structure of the motor itself, ensuring that the performance of the motor itself is not affected. Specifically:

[0024] 1. The evaporative cooling structure of the horizontal motor is realized in a relatively simple and economical way.

[0025] 2. The evaporative cooling circuit and the circulating cooling wind belt work together to cool the inner cavity of the base, effectively control the motor temperature, and thus improve the reliability of the motor operation. Through the above structure, the horizontal motor allows the use of a larger electrical density, which can further reduce the size and weight of the motor.

[0026] 3. The technical solution of the present application adopts a retaining punching sheet and a cooling punching sheet to form the final stator component, so that the special punching sheet directly forms an evaporative cooling structure in the iron core, which can effectively reduce the amount of cooling medium used, thereby effectively reducing the system cost. In addition, the technical solution of the present application realizes a mature and simple self-circulating system, avoiding the use of expensive and complex immersion and forced circulation systems. Instead, it changes the structure of the punching sheet itself and uses the front and back stacking of the retaining punching sheet and the cooling punching sheet to directly form an evaporative cooling passage for cooling inside the stator component. Not only is there no addition or use of external devices inside the motor, but only the structural improvements are made to the two types of punching sheets, which minimizes the manufacturing time and manufacturing cost, thereby effectively reducing the cost of the entire motor cooling system.

[0027] 4. The internal part of the stator core section can achieve comprehensive cooling while meeting the requirements of electromagnetic performance. By reasonably selecting a certain number of rib punching sheets (used as ribs, pipeline connections and normal magnetic conductivity) and refrigeration punching sheets (used for cooling), multiple punching sheets are staggered and stacked. Similar to the traditional self-adhesive sheet core manufacturing process, the external pressing process route is preferred. After the stacking is completed, the section enters the heating furnace for heating and curing, making the section a structural whole;

[0028] The outer diameter, inner diameter, slot size, and axial connecting hole of the retaining punching sheet and the cooling punching sheet in the technical solution of the present application are the same. At the same time, the structure of the two is consistent with the fan-shaped sheet used in the traditional iron core, and the upper and lower layers are staggered and stacked. In each stator core segment, the interior of the retaining punching sheet layers on both sides can be based on the cooling requirements and electromagnetic performance requirements. Finally, it is necessary to select which axial laminated layers to use the cooling punching sheets. It is only necessary to finally form a flow channel for the evaporative coolant between the multiple punching sheets.

[0029] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only show a certain embodiment of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 It is a three-dimensional structural schematic diagram of a wind power semi-direct drive unit generator with an evaporative cooling structure in the present application;

[0032] Figure 2 This is another three-dimensional structural schematic diagram of a wind power semi-direct drive unit generator with an evaporative cooling structure of the present application;

[0033] Figure 3 It is a three-dimensional structural schematic diagram of the machine base of this application;

[0034] Figure 4 It is a schematic diagram of the structural relationship between the machine base and the annular sealing plate of the present application;

[0035] Figure 5 It is a schematic diagram of the structural relationship between the core mounting ring and the stator core segment of the present application;

[0036] Figure 6 It is a schematic diagram of the structural relationship between the yoke and the end plate of the present application;

[0037] Figure 7 It is a schematic diagram of the structural relationship between the stator core segments and the ventilation slot pads of the present application;

[0038] Figure 8 It is a schematic diagram of the structural relationship between the cooling air duct, stator core segments and embedded strips of the present application;

[0039] Fig. 9 It is a three-dimensional structural schematic diagram of the stator core segment of the present application;

[0040] Fig.10 It is a schematic diagram of the three-dimensional structure of the segmented ring body of the iron core of the present application;

[0041] Fig.11 It is a three-dimensional structural schematic diagram of the segmented ring block of the present application;

[0042] Fig.12 yes Fig.11A partial enlarged schematic diagram of

[0043] Fig.13 It is a schematic diagram of the structure of the edge-retaining punching piece of the present application;

[0044] Fig.14 It is a schematic diagram of the structure of the cooling punch of the present application;

[0045] Fig.15 It is a schematic diagram of the three-dimensional structure of two cooling punches arranged alternately in the present application;

[0046] Fig.16 It is a schematic diagram of the three-dimensional structure of a ring body formed by circumferentially arranging a plurality of cooling punching sheets of the present application;

[0047] Fig.17 It is a schematic diagram of the three-dimensional structure of the front pressure ring of the present application;

[0048] Fig.18 It is another three-dimensional structural schematic diagram of the front pressure ring of the present application;

[0049] Fig.19 It is a three-dimensional structural schematic diagram of the ventilation slot pad of the present application.

[0050] In the figure: 1 base, 2 stator core segment, 3 cooling air path, 4 annular ventilation slot belt, 5 ventilation mounting seat, 6 cooling fan, 7 core segment ring body, 8 ventilation slot pad, 9 segment ring block, 10 retaining edge punching sheet, 11 cooling punching sheet, 12 embedded full slot, 13 liquid through hole, 14 embedded half slot, 15 liquid through single hole, 16 tooth cooling groove, 17 choke cooling groove, 18 core mounting ring, 19 front pressure ring, 20 rear pressure ring, 21 embedded strip, 22 contact surface, 23 annular sealing groove group, 24 inlet, 25 outlet, 26 connecting oil channel, 27 sealing ring placement groove, 28 heat exchanger, 29 annular sealing plate, 30 radial air outlet cavity, 31 annular wing plate, 32 yoke, 33 end plate, 34 air through hole. DETAILED DESCRIPTION

[0051] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0052] See also Figures 1 to 19 A wind power semi-direct drive generator with an evaporative cooling structure according to a preferred embodiment of the present invention comprises a base 1 and a generator assembly, wherein the generator assembly is fixedly mounted in the inner cavity of the base 1, the generator assembly comprises a stator component having a winding assembly and a rotor component having a generator shaft, and the stator component is fixedly mounted in the inner cavity of the base 1, the rotor component is rotatably arranged in the inner cavity of the base 1, and the stator component interacts with the rotor component;

[0053] The stator component includes a number of stator core segments 2, which are arranged in an array from front to back along the motor axis to form a whole, and a cooling air path 3 is provided between two adjacent stator core segments 2, and the winding assembly is wound around each stator core segment 2;

[0054] By utilizing the cooling air path 3 , all the stator core segments 2 can be directly cooled by air, thereby reducing the temperature of the stator core segments 2 and the windings.

[0055] The body of the machine base 1 is located at the stator component and is evenly provided with an annular ventilation slot belt 4 along the circumferential direction. The upper end of the body of the machine base 1 is located on both sides of the annular ventilation slot belt 4 and is fixedly provided with cooling fans 6 through ventilation mounting seats 5. The cooling fans 6 can be connected with the inner cavity of the machine base 1 through the ventilation mounting seats 5. The cooling fans 6, the cooling air path 3 and the annular ventilation slot belt 4 constitute a circulating cooling air belt.

[0056] The circulating cooling air belt can directly cool the stator and rotor components inside the motor, reducing the temperature of the motor when in use.

[0057] Each stator core segment 2 includes a number of core segment ring bodies 7, each of which has an evaporative cooling segment flow channel. A number of core segment ring bodies 7 are stacked in an array from front to back along the axial direction of the motor to form the stator core segment 2. The evaporative cooling segment flow channels of two adjacent core segment ring bodies 7 are interconnected to form an evaporative cooling annular flow channel of each stator core segment 2. A number of ventilation slot pads 8 are provided between the two adjacent stator core segments 2. The ventilation slot pads 8 are arranged in an annular array along the circumferential direction, and the evaporative cooling annular flow channels of the two adjacent stator core segments 2 can be connected through the ventilation slot pads 8. When a number of stator core segments 2 are arranged in an array from front to back along the axial direction of the motor to form a whole, the evaporative cooling annular flow channels can be connected front to back to form an evaporative cooling circuit.

[0058] A plurality of core segment ring bodies 7 are stacked front and back to form a stator core segment 2, and the stator core segments 2 are stacked front and back to form a stator component. Each core segment ring body 7 itself has an evaporative cooling segment flow channel that can circulate in the circumferential direction of the ring body. In the process of stacking the plurality of core segment ring bodies 7 front and back, the evaporative cooling segment flow channel is connected front and back (through the liquid-passing hole 13 and the liquid-passing single hole 15), thus forming the evaporative cooling annular flow channel of the stator core segment 2. In the process of stacking the plurality of stator core segments 2 front and back, the ventilation slot pad 8 can be used to realize The front and rear intervals constitute a cooling air path 3, and the ventilation slot pad 8 can also make the two adjacent evaporative cooling annular flow channels in the front and rear connected. Through the above principle, all the stator core segments 2 from front to back are connected, and finally the evaporative cooling circuit of the stator component is formed. In this way, the entire evaporative cooling system can be realized inside the motor: the condenser is connected to the evaporative cooling circuit of the stator component through a pipeline, and the evaporative cooling circuit is connected to the liquid collecting pipe through a pipeline, and the liquid collecting pipe is connected to the condenser through the return pipe, and finally a closed reflux is formed, thereby achieving the purpose of evaporative cooling.

[0059] The circulating cooling air belt and the evaporative cooling circuit work together to achieve cooling of the inner cavity of the base 1.

[0060] The two systems do not interfere with each other and can act independently. Compared with the traditional cooling method, the cooling effect of the technical solution of the present application is obviously better.

[0061] Preferably, each core segmented ring body 7 is composed of a plurality of segmented ring blocks 9 spliced ​​in an array along the circumferential direction, each segmented ring block 9 is composed of a plurality of sidewall punchings 10 and a plurality of cooling punchings 11 stacked front and back, the cooling punchings 11 are clamped front and back by the sidewall punchings 10, and the cooling punchings 11 and the sidewall punchings 10 together constitute a part of the evaporative cooling segmented flow channel;

[0062] The core segmented ring body 7 itself is also a circular ring structure, and by arranging a plurality of segmented ring blocks 9 in an array along the circumferential direction, a circular ring can be finally formed. It can be seen that the core segmented ring body 7 is formed by splicing a plurality of segmented ring blocks 9 in a circular shape.

[0063] Each stator core segment 2 is assembled and matched with the ventilation slot pad 8 through the retaining edge punching sheet 10 of the core segment ring body 7, that is, the evaporative cooling segment flow channels of the front and rear adjacent core segment ring bodies 7 can be connected through the ventilation slot pad 8.

[0064] Preferably, the outer contour structure and size of the side guard punch 10 and the side guard punch 10 are the same, and the side guard punch 10 and the side guard punch 10 are both fan-ring structures. The side guard punch 10 and the side guard punch 10 are both provided with an embedded full groove 12 and a liquid-passing hole 13 at the upper end of the sheet body, and the side guard punch 10 and the side guard punch 10 are symmetrically provided with an embedded half groove 14 and a liquid-passing single hole 15 at the left and right ends of the sheet body. One side of the side guard punch 10 is located at the tooth portion and has a plurality of tooth cooling grooves 16. One side of the side guard punch 10 is located above the tooth portion and has a choke cooling groove 17. The choke cooling groove 17 is connected to the tooth cooling groove 16, and its two ends extend to the liquid-passing hole 13 and the liquid-passing single hole 15 respectively, that is, one side of the side guard punch 10 constitutes a cooling surface A, and the other side constitutes a sealing surface B.

[0065] Preferably, the stator component also includes an iron core mounting ring 18, and a number of stator core segments 2 can be arranged in an array from front to back along the axial direction of the motor through the iron core mounting ring 18 to form a whole, and are fixedly installed at the inner cavity annular ventilation groove belt 4 of the base 1, the iron core mounting ring 18 includes a front pressure ring 19 and a rear pressure ring 20, and a number of embedding strips 21 are evenly arranged between the front pressure ring 19 and the rear pressure ring 20 along the circumferential direction, and the embedding strips 21 cooperate with the embedded full slot 12 and the embedded half slot 14, and a number of stator core segments 2 are arranged in an array from front to back along the axial direction of the motor between the front pressure ring 19 and the rear pressure ring 20, and are arranged at intervals through the ventilation slot pad 8 to form a cooling air path 3;

[0066] The front pressure ring 19 and the rear pressure ring 20 both have a contact surface 22 that fits with the retaining edge punching sheet 10. The front pressure ring 19 and the rear pressure ring 20 are both provided with an annular sealing groove group 23 that matches with the liquid-passing counter hole 13 and the liquid-passing single hole 15 on the contact surface 22. The ring body of the front pressure ring 19 also has an inlet 24 and an outlet 25. The inlet 24 and the outlet 25 are respectively connected with the corresponding annular sealing groove group 23, that is, the inlet 24 and the outlet 25 can be connected with the corresponding liquid-passing counter hole 13 and the liquid-passing single hole 15.

[0067] Each segmented ring block 9 includes two side guard punches 10 and two cooling punches 11. The two side guard punches 10 are respectively arranged at the outermost sides front and back and the outer contours of the two side guard punches 10 overlap front and back. The two cooling punches 11 are rotated 18° in the front and back direction and overlapped alternately, that is, the outer contour of the embedded half groove 14 of one cooling punch 11 partially overlaps with the outer contour of the embedded full groove 12 of the other cooling punch 11, and the outer contours of the other cooling punch 11 and the two side guard punches 10 overlap front and back. The two side guard punches 10 and the two cooling punches 11 are overlapped front and back to form a whole.

[0068] In general, each core segmented ring body 7 is ultimately a ring body structure composed of a plurality of segmented ring blocks 9. In the present embodiment, each segmented ring block 9 includes two sidewall punchings 10 and two cooling punchings 11. Therefore, each core segmented ring body 7 is ultimately composed of four circular rings with the same inner diameter and outer diameter, wherein the sidewall punchings 10 constitute two circular rings, and the cooling punchings 11 constitute two circular rings. The four circular rings are stacked front and back, and the two circular rings constituted by the sidewall punchings 10 are located at the front and rear ends. The order can be understood as the sidewall punchings 10, the cooling punchings 11, the cooling punchings 11, and the sidewall punchings 10.

[0069] Furthermore, when the two circular rings formed by the retaining punches 10 and one of the circular rings formed by the cooling punches 11 are stacked front and back in the same center, the circumferential direction of the two circular rings is ensured to be consistent, that is, the embedded full grooves 12 and the liquid-passing holes 13 of the three circular rings are overlapped front and back, and the other circular ring formed by the cooling punches 11 is stacked front and back in the same center with the other three circular rings, and the other circular ring is rotated 18° in the circumferential direction, so that the two circular rings formed by the cooling punches 11 are staggered, as shown in the attached figure. Fig.15 As shown, when the two rings are fitted together, due to the circumferential rotation of 18°, the cooling surfaces A and the sealing surfaces B of the two cooling punches 11 at the front and rear are fitted together at the front and rear. Such a structure can form a partial evaporative cooling segmented flow channel between the cooling punches 11 and the retaining edge punches 10 at the front and rear (each cooling surface A can achieve the sealing of the choke cooling groove 17 and the tooth cooling groove 16 through the sealing surface B and the retaining edge punch 10 at the front and rear, and finally form a closed liquid-passing cavity, and the inlet and outlet of the cooling liquid can be achieved through the liquid-passing hole 13, the liquid-passing single hole 15 and the ventilation groove pad 8, so that the four rings constitute the evaporative cooling segmented flow channel of the core segmented ring body 7);

[0070] The annular sealing groove group 23 of the front pressure ring 19 and the rear pressure ring 20 is provided with a sealing ring, so that the liquid-passing hole 13 and the liquid-passing single hole 15 can be blocked by the annular sealing groove group 23. Furthermore, the rear pressure ring 20 mainly plays the role of blocking the entire evaporative cooling circuit, and the front pressure ring 19 will reserve an inlet 24 and an outlet 25 for the entry and exit of the coolant (the pipeline is connected to the inlet 24 and the outlet 25). Specifically, the contour, size spacing and position of the inlet 24 and the outlet 25 are matched with the liquid-passing hole 13 and the liquid-passing single hole 15. The coolant can be injected into the segmented ring block 9 of the iron core segmented ring body 7 that fits the front pressure ring 19 through the inlet 24. Through the action of the liquid-passing hole 13, the liquid-passing single hole 15 and the ventilation groove pad 8, the coolant can eventually flow through the entire evaporative cooling circuit and finally flow out from the outlet 25;

[0071] Since the technical solution of the present application adopts the principle of self-circulating evaporative cooling, the inlet 24 is arranged at the bottom, and the coolant flows by itself and circulates from bottom to top without any fluid auxiliary device.

[0072] Preferably, the front and rear end surfaces of the ventilation groove gasket 8 are both in contact with the retaining edge punching plate 10, and the body of the ventilation groove gasket 8 is provided with a connecting oil passage 26 which is connected with the liquid-passing hole 13 and the single liquid-passing hole 15, and the body of the ventilation groove gasket 8 is provided with a sealing ring placement groove 27 located on the outer periphery of the connecting oil passage 26.

[0073] The ventilation slot pad 8 can make the two adjacent single liquid holes 15 realize oil circuit communication, so as to realize the communication between the two adjacent segmented ring blocks 9 on the left and right and front and back, and can also directly allow the coolant to enter the segmented ring block 9 through the liquid pair hole 13;

[0074] The structures and sizes of the rib punching sheet 10 and the cooling punching sheet 11 (excluding the cooling groove 17 of the choke part and the cooling groove 16 of the tooth part) are consistent, and both can realize the fan ring structure of left-right symmetry along the symmetry axis. When the two adjacent rib punching sheets 10 on the left and right and the two adjacent cooling punching sheets 11 on the left and right are fitted, the two embedded half slots 14 are fitted on the left and right to form an embedded full slot 12 (with the same profile, size spacing and position). Such a structure can ensure that even if the front and rear cooling punching sheets 11 are circumferentially staggered, they can be used in conjunction with the embedded strip 21 to achieve the fixation of the stator component;

[0075] Similarly, the two left and right liquid-passing single holes 15 can be fitted together to form the liquid-passing paired holes 13 (with the same outline, size spacing and position). Such a structure enables the two left and right adjacent sidewall punching sheets 10 and the two left and right adjacent cooling punching sheets 11 to be fitted together, and the two left and right liquid-passing single holes 15 can be connected by cooperating with the ventilation slot pad 8, so that the two adjacent segmented ring blocks 9 are connected. At the same time, when the sidewall punching sheets 10 and the cooling punching sheets 11 are stacked front and back, the connection between the liquid-passing single holes 15 and the liquid-passing paired holes 13 will not be affected, because the front and back overlap can be guaranteed, and the coolant can flow from front to back without obstacles.

[0076] In summary, each stator core segment 2 is composed of a plurality of core segment ring bodies 7 stacked front to back, and each core segment ring body 7 includes two circular rings formed by retaining edge punching sheets 10 and two circular rings formed by cooling punching sheets 11, and the four circular rings are stacked front to back. Since the liquid-passing single hole 15 and the liquid-passing pair hole 13 are both arranged in an overlapping manner front to back, the coolant can flow through the front to back, and then through the connection and coordination of the ventilation groove pad 8 with the liquid-passing pair hole 13 and the two adjacent liquid-passing single holes 15, the connection can be achieved from small to large, from point to surface: first, the left and right evaporative cooling segmented flow channels are connected, then the evaporative cooling annular flow channel is connected, and finally the evaporative cooling circuit is connected.

[0077] Preferably, the side extension lines of the sidewall punching sheet 10 and the two cooling punching sheets 11 have an angle α, and α is 36°. The outer peripheries of the sidewall punching sheet 10 and the cooling punching sheet 11 are coated with an insulating coating.

[0078] Since α is 36°, 10 segmented ring blocks 9 constitute an iron core segmented ring body 7. Furthermore, α being 36° makes each cooling punch 11 and the retaining edge punch 10 have a certain elevation angle, that is, there is an angle between the motor axis and the horizontal plane. In this way, the combination of the choke cooling groove 17 and the tooth cooling groove 16 is conducive to the evaporative cooling medium to establish a gravity pressure difference at different positions of the motor core ring, thereby forming a circulating cooling power and a better refrigeration effect. In the technical solution of the present application, the groove body of the choke cooling groove 17 is arc-shaped and concentric with the cooling punch 11, and the extension direction of the tooth cooling groove 16 is consistent with the extension direction of the tooth. Such a structure can better establish a gravity pressure difference.

[0079] Preferably, the inlet 24 and the outlet 25 are respectively located below and above the front pressure ring 19, and the two are arranged opposite to each other.

[0080] Preferably, a heat exchanger 28 is fixedly installed on the upper end of the base 1 between the cooling fans 6, and the base 1 also has an annular sealing plate 29 that matches the base 1. The annular sealing plate 29 is fixedly installed on the outer periphery of the base 1 and is located on the outer periphery of the annular ventilation groove band 4. A radial air outlet cavity 30 connected to the heat exchanger 28 is formed between the annular sealing plate 29 and the base 1.

[0081] Preferably, the base 1 has annular wing plates 31 on both sides of the annular ventilation slot 4 that match the annular sealing plate 29 .

[0082] The hot air discharged from the radial air outlet cavity 30 can be cooled by the heat exchanger 28, and then continued to be sent into the inner cavity of the base 1 through the cooling fan 6 for circulation cooling. In order to achieve a better cooling effect, an air path can also be opened at the rotor bracket of the rotor component. Specifically, air holes 34 are also opened on the yoke 32 and the end plate 33, and when the magnetic pole modules of the rotor component are arranged, gaps are also left between the front and rear adjacent magnetic pole modules. Such a structure can enable both the stator component and the rotor component to obtain sufficient circulating air cooling. After the cooling air is sent in by the cooling fan 6, it can reach the magnetic pole module through the air holes 34 of the yoke 32 and the end plate 33 for cooling, and the air path can continue to pass through the magnetic pole module to reach the stator component to cool the stator component until it enters the heat exchanger 28.

[0083] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A wind power semi-direct drive generator with an evaporative cooling structure, comprising a base (1) and a generator assembly, wherein the generator assembly is fixedly mounted in an inner cavity of the base (1), the generator assembly comprises a stator component having a winding assembly and a rotor component having a generator shaft, and the stator component is fixedly mounted in the inner cavity of the base (1), the rotor component is rotatably arranged in the inner cavity of the base (1), and the stator component interacts with the rotor component. Features: The stator component comprises a plurality of stator core segments (2), the plurality of stator core segments (2) being arranged in an array from front to back along the axial direction of the motor to form a whole, and a cooling air path (3) is provided between two adjacent stator core segments (2) at the front and rear, and a winding assembly is rotatably arranged on each stator core segment (2); The body of the machine base (1) is located at the stator component and is evenly provided with an annular ventilation groove belt (4) along the circumferential direction. The upper end of the body of the machine base (1) is located on both sides of the annular ventilation groove belt (4) and is fixedly provided with cooling fans (6) through ventilation mounting seats (5). The cooling fans (6) can be connected to the inner cavity of the machine base (1) through the ventilation mounting seats (5). The cooling fans (6), the cooling air path (3) and the annular ventilation groove belt (4) constitute a circulating cooling air belt. Each stator core segment (2) comprises a plurality of core segment ring bodies (7), each core segment ring body (7) having an evaporative cooling segment flow channel, a plurality of core segment ring bodies (7) are stacked in an array from front to back along the axial direction of the motor to form the stator core segment (2), the evaporative cooling segment flow channels of two adjacent core segment ring bodies (7) are interconnected, thereby forming an evaporative cooling annular flow channel of each stator core segment (2), a plurality of ventilation slot pads (8) are provided between two adjacent stator core segments (2), the plurality of ventilation slot pads (8) are arranged in an annular array along the circumferential direction, and the evaporative cooling annular flow channels of the two adjacent stator core segments (2) can be connected through the plurality of ventilation slot pads (8), and while the plurality of stator core segments (2) are arranged in an array from front to back along the axial direction of the motor to form a whole, the plurality of evaporative cooling annular flow channels can be connected front to back to form an evaporative cooling circuit; The circulating cooling air belt and the evaporative cooling circuit work together to cool the inner cavity of the machine base (1); The stator component also includes an iron core mounting ring (18), and a plurality of stator iron core segments (2) can be arranged in an array from front to back along the axial direction of the motor through the iron core mounting ring (18) to form a whole, and are fixedly mounted at the inner cavity annular ventilation groove belt (4) of the machine base (1). The iron core mounting ring (18) includes a front pressure ring (19) and a rear pressure ring (20), and a plurality of embedding strips (21) are evenly arranged between the front pressure ring (19) and the rear pressure ring (20) along the circumferential direction. The embedding strips (21) cooperate with the embedded full groove (12) and the embedded half groove (14), and a plurality of stator iron core segments (2) are arranged in an array from front to back along the axial direction of the motor between the front pressure ring (19) and the rear pressure ring (20), and are spaced apart by the ventilation groove pad (8) to form a cooling air path (3).

2. A wind power semi-direct drive generator with an evaporative cooling structure according to claim 1, Features: Each iron core segmented ring body (7) is composed of a plurality of segmented ring blocks (9) spliced ​​in an array along a circumferential direction, each segmented ring block (9) is composed of a plurality of side guard punches (10) and a plurality of cooling punches (11) stacked front and back, the cooling punches (11) are clamped front and back by the side guard punches (10), and the cooling punches (11) and the side guard punches (10) together constitute a portion of the evaporative cooling segmented flow channel; Each stator core segment (2) is assembled and matched with the ventilation slot pad (8) via the retaining edge punching sheet (10) of the core segment ring body (7), that is, the evaporative cooling segment flow channels of the front and rear adjacent core segment ring bodies (7) can be connected via the ventilation slot pad (8).

3. A wind power semi-direct drive generator with an evaporative cooling structure according to claim 2, Features: The outer contour structure and size of the side rib punching sheet (10) and the side rib punching sheet (10) are the same, and the side rib punching sheet (10) and the side rib punching sheet (10) are both fan ring structures. The upper ends of the side rib punching sheet (10) and the side rib punching sheet (10) are both provided with an embedded full groove (12) and a liquid passing hole (13). The left and right ends of the side rib punching sheet (10) and the side rib punching sheet (10) are both symmetrically provided with an embedded half groove (14) and a liquid passing single hole (15). A plurality of tooth cooling grooves (16) are formed on one side of the retaining plate (10) located at the tooth portion, and a choke cooling groove (17) is formed on one side of the retaining plate (10) located above the tooth portion. The choke cooling groove (17) is connected to the tooth cooling groove (16), and both ends thereof extend to the liquid-passing pair hole (13) and the liquid-passing single hole (15), respectively, that is, one side of the retaining plate (10) constitutes a cooling surface A, and the other side constitutes a blocking surface B.

4. A wind power semi-direct drive generator with an evaporative cooling structure according to claim 1, 2 or 3, Features: The front pressure ring (19) and the rear pressure ring (20) both have a contact surface (22) that fits the retaining edge punching sheet (10); the front pressure ring (19) and the rear pressure ring (20) both have an annular sealing groove group (23) that matches the liquid-passing counter hole (13) and the liquid-passing single hole (15) formed on the contact surface (22); the ring body of the front pressure ring (19) also has an inlet (24) and an outlet (25); the inlet (24) and the outlet (25) are respectively connected to the corresponding annular sealing groove group (23), that is, the inlet (24) and the outlet (25) can be connected to the corresponding liquid-passing counter hole (13) and the liquid-passing single hole (15); Each segmented ring block (9) comprises two side guard punches (10) and two cooling punches (11), the two side guard punches (10) are respectively arranged at the outermost sides in front and back and the outer contours of the two side guard punches (10) overlap in front and back, and the two cooling punches (11) are rotated 18 degrees in the front and back circumferential direction and are staggered and stacked, that is, the outer contour of the embedded half groove (14) of one cooling punch (11) partially overlaps with the outer contour of the embedded full groove (12) of the other cooling punch (11), and the outer contours of the other cooling punch (11) and the two side guard punches (10) overlap in front and back, and the two side guard punches (10) and the two cooling punches (11) are stacked in front and back to form a whole.

5. A wind power semi-direct drive generator with an evaporative cooling structure according to claim 1, Features: The front and rear end surfaces of the ventilation groove pad (8) are both in contact with the retaining edge punching sheet (10), the block body of the ventilation groove pad (8) is provided with a connecting oil passage (26) communicating with the liquid-passing hole (13) and the liquid-passing single hole (15), and the block body of the ventilation groove pad (8) is provided with a sealing ring placement groove (27) at the periphery of the connecting oil passage (26).

6. A wind power semi-direct drive generator with an evaporative cooling structure according to claim 1, Features: The side edge extension lines of the side guard punch (10) and the two cooling punches (11) have an included angle α, and α is 36 degrees. The outer peripheries of the side guard punch (10) and the cooling punch (11) are coated with an insulating coating.

7. A wind power semi-direct drive generator with an evaporative cooling structure according to claim 6, Features: The inlet (24) and the outlet (25) are respectively located below and above the front pressure ring (19), and the two are arranged opposite to each other.

8. A wind power semi-direct drive generator with an evaporative cooling structure according to claim 1, Features: The upper end of the base body of the machine base (1) is located between the cooling fan (6) and is fixedly provided with a heat exchanger (28). The machine base (1) also has an annular sealing plate (29) that matches the machine base (1). The annular sealing plate (29) is fixedly installed on the outer periphery of the machine base (1) and is located on the outer periphery of the annular ventilation groove belt (4). A radial air outlet cavity (30) that is connected to the heat exchanger (28) is formed between the annular sealing plate (29) and the machine base (1).

9. A wind power semi-direct drive generator with an evaporative cooling structure according to claim 8, Features: The base body of the machine base (1) is provided with annular wing plates (31) matched with the annular sealing plates (29) on both sides of the annular ventilation slot belt (4).

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