Stator structure, water box cover and stator bar

Abstract

The invention provides a stator structure, a water box cover and a stator bar, which can improve the reliability of the connection position of the end part of the stator bar and is beneficial to the safe operation of a generator set. The stator structure provided by the invention comprises a plurality of winding units, wherein each winding unit comprises two stator bars which are connected with each other; the winding unit further comprises an elastic connecting piece, and the ends of the two stator bars of the winding unit are connected through the elastic connecting piece.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and in particular to a stator structure, a water box cover and a stator wire rod. Background Art

[0002] The stator structure of the generator set includes a plurality of stator bars, which are embedded in the stator slots of the stator in a single form, and then the ends of two paired stator bars are electrically connected in the radial direction to form the entire winding of the stator structure.

[0003] With the widespread promotion of renewable energy power generation technology, generator sets (such as large steam turbine generator sets) will frequently operate in peak load regulation in order to cooperate with other renewable energy power generation devices. Due to the high electromagnetic load of the generator set, when it is frequently started and stopped, its stator wire bars will be subjected to large electric forces and vibrations in the stator slots. At this time, the connection at the end of the stator wire bar is relatively weak, and the received electric forces and vibrations will cause poor connection and affect the passage of current. In severe cases, it will cause the generator set to burn out, affecting the safe operation of the generator set. Summary of the invention

[0004] The purpose of the present application is to provide a stator structure, a water box cover and a stator wire bar, which can improve the reliability of the connection position of the stator wire bar end and facilitate the safe operation of the generator set.

[0005] In order to solve the above technical problems, the present application provides a stator structure, including multiple winding units, each of which includes two stator wire bars connected to each other; the winding unit also includes an elastic connecting member, and the ends of the two stator wire bars of the winding unit are connected by the elastic connecting member.

[0006] Optionally, the stator wire rod comprises a wire rod body and a water box, and both ends of the wire rod body are connected to the water box; the water box comprises a water box cover and a water box body, and the water box body is connected to the end of the wire rod body, and the water box cover comprises a base part and a connecting part, and the base part covers the water box body; the two connecting parts at the same end of the winding unit are connected by the elastic connecting piece;

[0007] The two connecting parts at the same end of the winding unit are distributed along a first direction, and the connecting part has a connecting part first side and a connecting part second side distributed along the first direction, and the base part has a base part first side and a base part second side distributed along the first direction; the connecting part second sides of the two connecting parts at the same end of the winding unit are arranged opposite to each other, and the two base part second sides are arranged opposite to each other;

[0008] Projected along a direction perpendicular to the base portion and perpendicular to the first direction, the projection of the first side of the connecting portion is located outside the projection of the first side of the base portion, and the projection of the second side of the connecting portion is located inside the projection of the second side of the base portion.

[0009] Optionally, the elastic connecting member includes two groups of spring sheets, each group has at least one spring sheet, and the two groups of spring sheets are stacked; the middle part of the spring sheet is a raised portion raised from one side to the other side, the raised directions of the raised portions of each group of spring sheets are the same, and the raised directions of the raised portions of the two groups of spring sheets are opposite.

[0010] Optionally, the winding unit includes a connecting component, which includes a fastener, two groups of elastic connecting members, and two groups of pressure plates; one group of the elastic connecting members and one group of the pressure plates are arranged on both sides of the connecting part, and the elastic connecting member is located between the connecting part and the pressure plate; the winding unit also includes a fastener, which passes through the two groups of pressure plates, the two groups of elastic connecting members and the connecting part to fix the elastic connecting member and the connecting part.

[0011] Optionally, the elastic connecting member is made of metal.

[0012] Optionally, the water box body and the wire rod body are welded and connected, and / or the stator wire rod further includes a joint portion, the joint portion and the connecting portion are welded and connected and communicate with the cooling channel of the water box.

[0013] In this application, the two stator bars of the winding unit are connected by an elastic connector. On the premise of meeting the connection strength, based on the elastic deformation characteristics, it can adapt to the dimensional deviation of the two stator bars and has the ability to absorb electromagnetic vibrations, thereby improving the reliability of the end connection of the stator bar and facilitating the safe operation of the generator set.

[0014] The present application also provides a water box cover, comprising a base portion and a connecting portion, wherein the base portion is used to connect to a water box body of a stator wire rod, and the connecting portion is used to connect to a connecting portion of the water box of another stator wire rod through an elastic connecting piece;

[0015] The connecting portion has a first connecting portion side and a second connecting portion side distributed along a first direction, and the base portion has a first base portion side and a second base portion side distributed along the first direction; projected along a direction perpendicular to the base portion and perpendicular to the first direction, the projection of the first side of the connecting portion is located outside the projection of the first side of the base portion, and the projection of the second side of the connecting portion is located inside the projection of the second side of the base portion.

[0016] Optionally, the water box cover has a cooling channel, the cooling channel includes a first channel section and a second channel section, the second channel section is located at the connecting portion, at least part of the first channel section is located at the base portion; the second channel section is inclined relative to the first channel section.

[0017] Optionally, the connecting portion is provided with a first connecting through hole for connecting with the elastic connecting member.

[0018] Optionally, a recessed portion is provided at a location where the connecting portion and the base portion are connected.

[0019] The present application also provides a stator wire rod, including a wire rod body and a water box, the water box including a water box body and a water box cover, the water box body and the end of the wire rod body are connected, and the water box body has an opening, the water box cover is any one of the water box covers described above, and the water box cover covers the opening.

[0020] The stator wire rod and its water box cover in the application scheme have the following technical effects: the two mutually connected stator wire rods of the generator set have limited radial space, and the connecting part of the water box cover in the application scheme is eccentrically arranged to maximize the spacing between the two connecting parts of the water box cover within the limited space. On the premise of ensuring the area for connection with the elastic connecting part, the length of the elastic connecting part can be lengthened, so that the function of the elastic connecting part can be effectively exerted. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the stator structure in the embodiment of the present application;

[0022] Figure 2 for Figure 1 A schematic diagram of the structure of a pair of stator bars;

[0023] Figure 3 for Figure 2 A schematic diagram of the structure of the ends of a pair of stator bars;

[0024] Figure 4 for Figure 3 A schematic diagram of the structure from another angle;

[0025] Figure 5 for Figure 3 A schematic diagram of the structure of a pair of stator bars after removing the connecting components from the ends thereof;

[0026] Figure 6 for Figure 5 Schematic diagram of the structure of the grey water box cover;

[0027] Figure 7 for Figure 6 Top view of the grey water box cover;

[0028] Figure 8 for Figure 6 AA section view of the grey water box cover.

[0029] The following are the descriptions of the reference numerals:

[0030] 100- stator structure;

[0031] 10-winding unit; 101-first wire rod; 102-second wire rod;

[0032] 11-stator bar; 111-bar body; 112-water box; 1121-water box body; 1122-water box cover; 11221-base; 11221a-first port; 11221A-first side of base; 11221B-second side of base; 11222-connection; 11222A-first side of connection; 11222B-second side of connection; 11222C-first connection side; 11222D-second connection side; 11222a-first connection through hole; 11222b-second port; 11222c-recess; 1122a-cooling channel; 1122a1-first channel section; 1122a2-second channel section; 113-joint;

[0033] 103-connecting assembly; 1031-elastic connecting member; 10311-spring; 10311a-protrusion; 1032-pressing plate; 1033-fastener; 1034-shim; 1035-nut;

[0034] 20- stator core. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0036] In the embodiments of the present application, the terms "first", "second", etc. are only used to distinguish components with similar or identical structures, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0037] Please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic structural diagram of a stator structure 100 in an embodiment of the present application; Figure 2 for Figure 1 Schematic diagram of the structure of a pair of stator bars 11.

[0038] This embodiment provides a stator structure 100 of a generator set, the stator structure 100 includes a stator core 20 and a winding, the winding includes a plurality of stator bars 11, the stator bars 11 are grouped in pairs, that is, include a plurality of pairs of stator bars 11, the stator bars 11 can be embedded in corresponding stator slots of the stator core 20, and the two ends of each pair of stator bars 11 are connected to each other to form a winding unit 10. Figure 2 As shown, a pair of stator bars 11 connected to each other can be defined as a first bar 101 and a second bar 102, respectively. After assembly, along the radial direction of the stator structure 100, compared with the second bar 102, the end of the first bar 101 is farther away from the central axis of the stator structure 100 in the radial direction, that is, the end of the first bar 101 is located radially outside the end of the second bar 102, and the ends of the two are arranged opposite to each other in the radial direction, as shown in FIG. Figure 1 shown.

[0039] You can continue to refer to Figure 3 and Figure 4 understand, Figure 3 for Figure 2 A schematic structural diagram of the ends of a pair of stator bars 11, illustrating the connection between the first bar 101 and the second bar 102; Figure 4 for Figure 3 Schematic diagram of the structure from another angle.

[0040] The stator structure 100 in this embodiment includes a plurality of connection components 103, and the corresponding ends of a pair of stator bars 11 are connected through the connection components 103, that is, the end of the first bar 101 and the corresponding end of the second bar 102 are both connected through the connection components 103. The connection components 103 include an elastic connector 1031, which is a metal component. On the one hand, the elastic connector 1031 is in direct or indirect contact with the first bar 101 and the second bar 102 to achieve electrical connection between the first bar 101 and the second bar 102; on the other hand, the elastic connector 1031 made of metal is conducive to having a certain elastic deformation ability. The elastic connector 1031 in this embodiment is, for example, a metal component of a sheet structure with good elastic deformation ability. It can be seen that the elastic connector 1031 is not limited to a sheet structure, and can be, for example, a relatively thin columnar structure, etc., as long as it has a certain elastic deformation ability and can conduct electricity.

[0041] In this application embodiment, the first wire bar 101 and the second wire bar 102 are connected by an elastic connector 1031. On the premise of meeting the strength of the connection, based on the elastic deformation characteristics, it can adapt to the dimensional deviation between the first wire bar 101 and the second wire bar 102, and has the ability to absorb electromagnetic vibrations, thereby improving the reliability of the end connection of the stator wire bar 11 and facilitating the safe operation of the generator set.

[0042] Specifically, each stator wire bar 11 includes a wire bar body 111 and a water box 112. The two ends of the wire bar body 111 are respectively connected to a water box 112. Along the axial direction of the stator structure 100, in each pair of stator wire bars 11, the water box 112 at one end of the first wire bar 101 along the axial direction and the water box 112 at the corresponding end of the second wire bar 102 are connected through a connecting component 103, and the water box 112 at the other end of the first wire bar 101 along the axial direction and the water box 112 at the corresponding end of the second wire bar 102 are connected through another connecting component 103. At this time, the water box 112 is also a metal part, such as oxygen-free copper with good conductivity. The elastic connecting part 1031 is in direct or indirect contact with the water box 112, and the water box 112 is in direct or indirect contact with the wire bar body 111, so as to realize the electrical connection between the two stator wire bars 11.

[0043] In this embodiment, both ends of each wire rod body 111 are connected to a water box 112, and the water box 112 includes a water box body 1121 and a water box cover 1122. One end of the water box body 1121 is connected to the end of the wire rod body 111, and can be separately set in connection with the wire rod body 111, or can be set in an integral manner. The other end of the water box body 1121 has an opening, and the water box cover 1122 covers the opening of the water box body 1121 to form a relatively closed box cavity to prevent cooling water leakage. The wire rod body 111 in the embodiment of the present application is a hollow tubular structure. Cooling water can enter the wire rod body 111 from the water box 112 at one end to cool the stator wire rod 11, and then flow out from the water box 112 at the other end to form a circulation of the cooling water circuit.

[0044] At this point, you can continue to refer to Figure 5 and Figure 6 , Figure 5 for Figure 3 A schematic structural diagram of a pair of stator bars 11 with the connection assembly 103 removed from the ends thereof; Figure 6 for Figure 5 A schematic structural diagram of the reclaimed water box cover 1122.

[0045] The water box cover 1122 of the stator wire rod 11 in this embodiment includes a base portion 11221 and a connecting portion 11222 connected to each other. The base portion 11221 and the connecting portion 11222 can be an integrated structure, and of course the two can also be processed separately and then fixedly connected. The base portion 11221 is used to connect the water box body 1121. The base portion 11221 is specifically a plate-like structure in this embodiment, which is adapted to the opening of the water box body 1121. The water box body 1121 can be a square shell structure with an opening on one side, and the base portion 11221 is correspondingly a square plate-like structure to just cover the opening of the water box body 1121. The base portion 11221 and the water box body 1121 are fixed, for example, by welding. Of course, other connection and fixing methods can also be used, and it is only necessary to ensure the sealing between the base portion 11221 and the water box body 1121.

[0046] like Figure 3 As shown, the two water box covers 1122 at the same end of each pair of stator wire bars 11 are connected through the connecting assembly 103, and the connecting portion 11222 of the water box cover 1122 is used to connect with the elastic connecting member 1031 of the connecting assembly 103. One end of the elastic connecting member 1031 is connected to the water box cover 1122 at one end of one stator wire bar 11 in the winding unit 10, and the other end of the elastic connecting member 1031 is connected to the water box cover 1122 of another stator wire bar 11 located at the same end.

[0047] It is worth noting that in this embodiment, one end of the connection portion 11222 of the water box cover 1122 is connected to the base portion 11221. When the two are integrally arranged, a chamfer can be provided at the connection position to reduce stress concentration. The connection portion 11222 and the base portion 11221 both have two side portions arranged opposite to each other along a first direction, which are respectively defined as the first side portion 11222A of the connection portion and the second side portion 11222B of the connection portion, and the first side portion 11221A of the base portion and the second side portion 11221B of the base portion. The first direction is the distribution direction of the two water box covers 1122 of a pair of stator wire rods 11 during assembly, and is also the radial direction of the stator structure 100, as shown in FIG. Figure 5 As shown, the first direction is also the width direction of the wire rod body 111 . The wire rod body 111 has two ends distributed along the axial direction of the stator structure 100 , and the direction from one end to the other end is the length direction of the wire rod body 111 .

[0048] You can continue to refer to Figure 7 , Figure 7 for Figure 6 A top view of the grey water box cover 1122.

[0049] At this time, the projection along the direction perpendicular to the base portion 11221 and perpendicular to the first direction, that is, along the third direction (shown in Figure 5), the projection of the first side portion 11222A of the connection portion is located outside the projection of the first side portion 11221A of the base portion, and the projection of the second side portion 11222B of the connection portion is located inside the projection of the second side portion 11221B of the base portion. It can be seen that the water box cover 1122 in this embodiment is eccentrically designed, and the geometric center line of the connection portion 11222 of the water box cover 1122 and the geometric center line of the base portion 11221 are not collinear, but staggered in the first direction.

[0050] With this setting, you can continue to refer to Figure 5 It is understood that when the first wire rod 101 and the second wire rod 102 are assembled into a winding unit 10, the first side portion 11222A of the connection portion of the water box cover 1122 of the first wire rod 101 and the first side portion 11222A of the connection portion of the water box cover 1122 of the second wire rod 102 can be arranged back to back, and the second side portions 11222B of the connection portions of the two connection portions 11222 are arranged opposite to each other, that is, the ends of the first wire rod 101 and the second wire rod 102 are mirror images of each other, and the offset directions of the water box covers 1122 of the two are opposite. Figure 5 In the embodiment, the connection part 11222 of the water box cover 1122 of the first wire rod 101 on the upper side is biased upward, and the connection part 11222 of the water box cover 1122 of the second wire rod 102 on the lower side is biased downward. In this way, while ensuring that the connection part 11222 has a sufficient area to establish a connection with the elastic connector 1031, the distance h between the connection parts 11222 of the two water box covers 1122 can be increased, so that the length of the elastic connector 1031 can be set to be longer, and the elastic connector 1031 can be strengthened to adapt to the size deviation between the two stator wire rods 11 and absorb vibration, thereby further ensuring that the generator set can operate safely and stably for a long time.

[0051] It can be seen that the radial space between the two interconnected stator bars 11 of the generator set is limited. In this embodiment, the connecting portion 11222 of the water box cover 1122 is eccentrically designed to increase the distance between the two connecting portions 11222 as much as possible within the limited space, so as to lengthen the length of the elastic connecting member 1031 and enable the elastic connecting member 1031 to function effectively.

[0052] like Figure 5 , 6 As shown, in some embodiments, the connecting portion 11222 may be provided with a first connecting through hole 11222a, and the connecting assembly 103 includes a fastener 1033, and the fastener 1033 is, for example, Figure 3 The fastening screw shown in the figure may also be a fastening pin, a fastening bolt, etc. The end of the elastic connecting member 1031 is provided with a second connecting through hole ( Figure 3 , 4The second connecting through hole in the connecting portion 11222 is blocked by the fastener 1033), the fastener 1033 can be inserted into the corresponding first connecting through hole 11222a and the second connecting through hole to fix the water box 112 and the elastic connecting member 1031. The connecting portion 11222 can be provided with a plurality of first connecting through holes 11222a, and the elastic connecting member 1031 can be provided with a corresponding number of second connecting through holes, so that the elastic connecting member 1031 and the water box 112 can be fixed more reliably.

[0053] Please continue to combine Figure 8 understand, Figure 8 for Figure 6 AA sectional view of the water box cover 1122.

[0054] The water box cover 1122 in this embodiment has a cooling channel 1122a, one end of the cooling channel 1122a passes through the first end of the water box cover 1122 to form a second port 11222b, and the second port 11222b can be used to connect to the joint part 113 of cooling water, and the joint part 113 is connected to the circulation pipeline of cooling water, for example. The other end of the cooling channel 1122a passes through the other end of the water box cover 1122 to form a first port 11221a, and the first port 11221a is used to communicate with the inner cavity of the water box body 1121.

[0055] Due to the eccentric setting of the water box cover 1122, as Figure 8 As shown, the cooling channel 1122a includes a first channel section 1122a1 and a second channel section 1122a2, the second channel section 1122a2 is located at the connecting portion 11222, at least part of the first channel section 1122a1 is located at the base portion 11221, one end of the first channel section 1122a1 is a first port 11221a, and one end of the second channel section 1122a2 is a second port 11222b. The end of the wire rod body 111 of the first wire rod 101 and the end of the wire rod body 111 of the second wire rod 102 are substantially parallel, the second channel section 1122a2 and the ends of the wire rod bodies 111 of the first wire rod 101 and the second wire rod 102 are substantially parallel, and the first channel section 1122a1 is tilted relative to the second channel section 1122a2, and the tilt angle is , when the size of the connecting portion 11222 remains unchanged, the inclination angle The size of will affect the eccentricity of the connecting portion 11222 relative to the base portion 11221, and will also affect the distance between the two oppositely disposed connecting portions 11222.

[0056] Figure 8In the embodiment, the eccentricity of the connecting portion 11222 relative to the base portion 11221 is H, the first port 11221a is located in the middle of the base portion 11221, and the second port 11222b is located in the middle of the connecting portion 11222. Compared with the geometric center lines of the connecting portion 11222 and the base portion 11221 coinciding with each other, the distance between the two connecting portions 11222 in this embodiment is increased by 2H. Define the length of the first channel section 1122a1 as B, then ), which can be adjusted by and The distance D between the connecting portion 11222 of the first wire rod 101 and the second wire rod 102 is adjusted by Figure 5 ).

[0057] As mentioned above, the water box cover 1122 and the water box body 1121 can be welded and fixed to ensure reliable connection. At this time, the connection part 11222 can be provided with a recessed part 11222c, and the recessed part 11222c is located at the position where the connection part 11222 and the base part 11221 meet. In this way, the wall thickness of the connection part 11222 at the position of the recessed part 11222c is relatively thin, and ultrasonic flaw detection can be performed on the recessed part 11222c after welding to check the welding quality. Figure 5 , 8 As shown, the recessed portion 11222c is disposed on an eccentric side of the connecting portion 11222, namely, on the first side 11222A of the connecting portion, so that it is not easy to communicate with the first channel section 1122a1, thereby preventing leakage.

[0058] Look again Figure 8 , the length of the second channel section 1122a2 is L, the connecting portion 11222 is provided with two groups of first connecting through holes 11222a, each group includes two first connecting through holes 11222a, wherein one group of first connecting through holes 11222a is located on one side of the second channel section 1122a2 along the first direction, and the other group of first connecting through holes 11222a is located on the other side of the second channel section 1122a2 along the first direction. A part of the first channel section 1122a1 is located on the connecting portion 11222, and a part is located on the base portion 11221. Obviously, and The value of should be moderate. If the value of is too large (L value is relatively small), it is easy to cause the first channel section 1122a1 to penetrate the first connecting through hole 11222a and cause water leakage. If the value is too large, it may cause the first channel section 1122a1 to penetrate the recessed portion 11222c, resulting in water leakage.

[0059] like Figure 3As shown, the connection portion 11222 of the water box cover 1122 also has a first connection side portion 11222C and a second connection side portion 11222D distributed along a second direction, and the second direction is perpendicular to the first direction. The first connection side portions 11222C of a pair of connection portions 11222 at one end of each winding unit 10 are connected by a connection component 103, and the two second connection side portions 11222D at the other end are connected by another connection component 103, that is, each end of the winding unit 10 has two connection components 103.

[0060] Each connection assembly 103 further includes a pressing plate 1032, and the elastic connection member 1031 is located between the first connection side portion 11222C (or the second connection side portion 11222D) of the connection portion 11222 of the water box cover 1122 and the pressing plate 1032. The above-mentioned fastener 1033 passes through the two groups of connection assemblies 103 and the first connection through hole 11222a at the same time to fix the elastic connection member 1031 and the connection portion 11222 of the water box cover 1122. The pressing plate 1032 is conducive to protecting the elastic connection member 1031 and preventing it from being crushed by the fastener 1033. Figure 4 As shown, a pad 1034 may also be provided. One end of the fastener 1033 passes through the connection assembly 103 and then passes through the pad 1034 and is locked by a nut 1035 . The pad 1034 also serves to protect the pressure plate 1032 .

[0061] The elastic connecting member 1031 in this embodiment includes two groups of spring pieces 10311, which are metal spring pieces. The two groups of spring pieces 10311 are stacked together, and the number of spring pieces 10311 in each group is at least one. In this embodiment, the number of spring pieces 10311 in each group is one, which can be set according to the actual connection strength and elastic deformation capacity requirements. The middle part of each spring piece 10311 protrudes from one side to the other side to form a protruding portion 10311a, that is, the middle part of the spring piece 10311 is protruded relative to the two end portions. The spring pieces 10311 in the same group have the same protruding direction, while the protruding directions of the protruding portions 10311a of the two groups of spring pieces 10311 are opposite. After the two groups of spring pieces 10311 are stacked, a bulging portion is formed in the middle part of the elastic connector 1031 along the third direction, which passes through the elastic connector 1031. The third direction is perpendicular to the first direction and the second direction mentioned above, and the third direction is also the distribution direction of the base portion 11221 and the connecting portion 11222.

[0062] In this way, the elastic connector 1031 has a structure with small ends and large middle. When the elastic connector 1031 is deformed, the position of the bulge can limit the deformation direction. The bulge contracts, that is, the two protrusions 10311a are close to each other, and the entire elastic connector 1031 is elongated. The bulge expands, that is, the two protrusions 10311a are away from each other, and the entire elastic connector 1031 is shortened, so that the deformation of the elastic connector 1031 can be better controlled. Moreover, the setting of the bulge is also conducive to ensuring the connection strength of the elastic connector 1031. Specifically, except for the parts connected to the two ends and the two connecting parts 11222 of the elastic connector 1031, the rest is basically the bulge, which has a thicker thickness to ensure strength.

[0063] The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A stator structure, characterized in that: It comprises a plurality of winding units, each of which comprises two stator bars connected to each other; the winding unit further comprises an elastic connector, and ends of the two stator bars of the winding unit are connected by the elastic connector.

2. The stator structure according to claim 1, characterized in that: The stator wire rod comprises a wire rod body and a water box, and the two ends of the wire rod body are connected to the water box; the water box comprises a water box cover and a water box body, and the water box body is connected to the end of the wire rod body, and the water box cover comprises a base part and a connecting part, and the base part covers the water box body; the two connecting parts at the same end of the winding unit are connected by the elastic connecting piece; The two connecting parts at the same end of the winding unit are distributed along a first direction, and the connecting part has a connecting part first side and a connecting part second side distributed along the first direction, and the base part has a base part first side and a base part second side distributed along the first direction; the connecting part second sides of the two connecting parts at the same end of the winding unit are arranged opposite to each other, and the two base part second sides are arranged opposite to each other; Projected along a direction perpendicular to the base portion and perpendicular to the first direction, the projection of the first side of the connecting portion is located outside the projection of the first side of the base portion, and the projection of the second side of the connecting portion is located inside the projection of the second side of the base portion.

3. The stator structure according to claim 1 or 2, characterized in that: The elastic connecting member includes two groups of spring sheets, each group has at least one spring sheet, and the two groups of spring sheets are stacked; the middle part of the spring sheet is a raised portion raised from one side to the other side, the raised directions of the raised portions of each group of spring sheets are the same, and the raised directions of the raised portions of the two groups of spring sheets are opposite.

4. The stator structure according to claim 3, characterized in that: The winding unit includes a connecting component, which includes a fastener, two groups of elastic connecting members, and two groups of pressure plates; one group of the elastic connecting members and one group of the pressure plates are arranged on both sides of the connecting portion, and the elastic connecting member is located between the connecting portion and the pressure plate; the winding unit also includes a fastener, which passes through the two groups of pressure plates, the two groups of elastic connecting members, and the connecting portion to fix the elastic connecting member and the connecting portion.

5. The stator structure according to claim 1 or 2, characterized in that: The elastic connecting piece is made of metal.

6. The stator structure according to claim 1 or 2, characterized in that: The water box body and the wire rod body are welded and connected, and / or the stator wire rod further includes a joint portion, the joint portion and the connection portion are welded and connected and communicate with the cooling channel of the water box.

7. The water box cover is characterized in that: It comprises a base part and a connecting part, wherein the base part is used to connect the water box body of the stator wire rod, and the connecting part is used to connect with the connecting part of the water box of another stator wire rod through an elastic connecting piece; The connecting portion has a first connecting portion side and a second connecting portion side distributed along a first direction, and the base portion has a first base portion side and a second base portion side distributed along the first direction; projected along a direction perpendicular to the base portion and perpendicular to the first direction, the projection of the first side of the connecting portion is located outside the projection of the first side of the base portion, and the projection of the second side of the connecting portion is located inside the projection of the second side of the base portion.

8. The water box cover according to claim 7, characterized in that: The water box cover has a cooling channel, which includes a first channel section and a second channel section, wherein the second channel section is located at the connecting portion, and at least part of the first channel section is located at the base portion; the second channel section is arranged obliquely relative to the first channel section.

9. The water box cover according to claim 7 or 8, characterized in that: The connecting portion is provided with a first connecting through hole for connecting with the elastic connecting member.

10. The water box cover according to claim 7 or 8, characterized in that: A recessed portion is provided at a location where the connecting portion and the base portion are connected.

11. The stator bar is characterized in that: It includes a wire rod body and a water box, wherein the water box includes a water box body and a water box cover, the ends of the water box body and the wire rod body are connected, and the water box body has an opening, and the water box cover is the water box cover according to any one of claims 7 to 10, and the water box cover covers the opening.

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