CN216625451U

CN216625451U - New energy automobile motor waterway structure

Info

Publication number: CN216625451U
Application number: CN202122476479.4U
Authority: CN
Inventors: 张境方; 三浦一夫
Original assignee: Chery Anchuan Electric Drive System Co ltd
Current assignee: Chery Anchuan Electric Drive System Co ltd
Priority date: 2021-10-14
Filing date: 2021-10-14
Publication date: 2022-05-27
Anticipated expiration: 2031-10-14

Abstract

The utility model provides a new energy automobile motor waterway structure applied to the technical field of new energy automobile motors, wherein one end of each shell assembly (2) of the new energy automobile motor waterway structure is provided with a cooling water channel assembly (3), the shell assembly outer layer (4) and the shell assembly inner layer (5) of each shell assembly (2) are connected through a connecting strip (6), the shell assembly outer layer (4) at one side of the connecting strip (6) is provided with a water inlet (7), the shell assembly outer layer (7) at the other side of the connecting strip (6) is provided with a water outlet (8), and the shell assemblies (1) are arranged into an integrally cast structure. The water leakage fault probability is reduced, welding is cancelled, air holes are avoided, and the overall quality and the use safety of the motor are improved.

Description

New energy automobile motor waterway structure

Technical Field

The utility model belongs to the technical field of new energy automobile motors, and particularly relates to a waterway structure of a new energy automobile motor.

Background

On a new energy automobile, a motor is one of core components, and a cooling water circuit of the motor is an indispensable component. The cooling water path is arranged on the motor shell. In the prior art, a cooling water path of a motor shell needs to be matched by three or four parts to form a complete cooling loop. Meanwhile, the motor shell and the end covers on two sides are fixedly connected, a complete cooling water path can be formed, the sealing points are multiple, the parts need to be connected in a bolt connection mode, and part of the parts need to be connected in a welding mode.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is as follows: the novel energy automobile motor waterway structure is simple in structure, changes through structure and machining process, effectively reduces machining difficulty of the motor shell, reduces procedures, enables only one cooling waterway of the motor shell to be sealed through a sealing gasket, reduces sealing failure points, reduces water leakage fault probability, cancels welding process, avoids air holes from appearing, and improves overall quality of the motor and use safety.

To solve the technical problems, the technical scheme adopted by the utility model is as follows:

the utility model relates to a new energy automobile motor waterway structure which comprises a motor shell, wherein the motor shell comprises two shell components, the two shell components are fixedly connected through connecting bolts, one end of each shell component is provided with a cooling water channel component extending towards the interior of the shell component, the section of each cooling water channel component is in a U-shaped structure, each shell component is divided into an outer shell component layer and an inner shell component layer by the cooling water channel component, the outer shell component layer and the inner shell component layer of each shell component are connected through a connecting strip arranged along the axial direction of the motor shell, the outer shell component layer on one side of the connecting strip is provided with a water inlet, the outer shell component layer on the other side of the connecting strip is provided with a water outlet, and the shell components are in an integrally cast structure.

Motor casing 1 include casing subassembly I and casing subassembly II, I one end of casing subassembly set up to the inside cooling water course subassembly I that extends of casing subassembly, cooling water course subassembly I divide into casing subassembly I skin and the I inlayer of casing subassembly with casing subassembly I, the I skin of casing subassembly and the I inlayer of casing subassembly are connected through axial arrangement's connecting strip I, II one end of casing subassembly set up to the inside cooling water course subassembly II that extends of casing subassembly II, cooling water course subassembly II divide into casing subassembly II skin and the II inlayer of casing subassembly with casing subassembly II, II skins of casing subassembly and the II inlayer of casing subassembly are connected through axial arrangement's connecting strip II.

New energy automobile motor waterway structure's I skin of casing assembly on one side of the connecting strip of casing assembly I set up the water inlet, set up the delivery port on the I skin of casing assembly on the I opposite side of connecting strip.

The water inlet is formed in the outer layer of the shell assembly II on one side of the connecting strip II of the shell assembly II of the new energy automobile motor waterway structure, and the water outlet is formed in the outer layer of the shell assembly II on the other side of the connecting strip II.

New energy automobile motor waterway structure's casing assembly I go up to set up the air flue I that pierces through connecting strip I, I one end port of air flue is close to the water inlet, I other end port of air flue is close to the delivery port.

The outer surface of the shell assembly I of the motor shell 1 is provided with a connecting seat I which is flush with the sealing surface of the shell assembly I, a screw hole I is formed in the connecting seat I, the outer layer of the shell assembly II of the motor shell is provided with a connecting seat II which is flush with the sealing surface of the shell assembly II, a screw hole II is formed in the connecting seat II, and a connecting bolt penetrates through the screw hole I and the screw hole II to fixedly connect the shell assembly I with the shell assembly II.

And a sealing gasket is arranged between the sealing surface of the shell component I and the sealing surface of the shell component II.

The connecting strip II of the shell assembly II of the new energy automobile motor waterway structure is provided with an air passage II penetrating through the connecting strip II, one end port of the air passage II is close to the water inlet, and the other end port of the air passage II is close to the water outlet.

The I other end of casing subassembly set up I connection face of end cover, end cover I passes through I connecting bolt of end cover and is connected fixed connection with I connection face of end cover.

The other end of the shell component II is provided with an end cover II connecting surface, and the end cover II is fixedly connected with the end cover II connecting surface through an end cover II connecting bolt.

By adopting the technical scheme of the utility model, the following beneficial effects can be obtained:

according to the new energy automobile motor waterway structure, a brand new design idea is adopted to arrange the cooling waterway of the motor shell, the motor shell is divided into two shell components to be processed, and the two shell components are respectively formed by integral casting, so that the process is simplified. And the casing subassembly of integral type casting processing, one end terminal surface extend to casing subassembly in has the cooling water course subassembly, and the casing subassembly other end is the enclosed construction, like this, sets up seal gasket between two casing subassemblies, and then the lock is in the same place, connects through connecting bolt. Therefore, the cooling water channel is formed, and only one sealing gasket is used for sealing the cooling water channel, unlike the prior art that the motor shell and the two end covers are processed respectively and then connected to form the cooling water channel. Compared with the two structures, the structure of the utility model not only simplifies the processing technology of the shell assembly, but also reduces the sealing difficulty of the cooling water channel, improves the sealing effect and has obvious advantages. Meanwhile, a welding process is not needed, and the problem that potential safety hazards exist due to air holes in welding parts does not exist naturally. And motor casing forms the motor with other part equipment after, and cooling water gets into from the water inlet, because the existence of connecting strip, the cooling water that gets into can not flow to delivery port direction directly, but flows around the cooling water course that shell assembly skin and shell assembly inlayer formed, just can follow the delivery port and flow around motor casing a week back. Like this, the shell assembly skin passes through the connecting strip with the shell assembly inlayer and realizes both reliable connections, and the connecting strip has the effect of realizing the cooling water isolation, ensures that the cooling water flows just can flow a week. And the housing assembly outer layer, the housing assembly inner layer and the connecting strips are actually integrally cast. The water path structure of the motor of the new energy automobile is simple in structure, the processing difficulty and the working procedures of the motor shell are reduced through the change of the structure and the processing technology, only one cooling water path of the motor shell is sealed by the sealing gasket, sealing failure points are reduced, the probability of water leakage faults is reduced, welding is omitted, air holes are avoided, and the overall quality and the use safety of the motor are improved.

Drawings

The contents of the description and the references in the drawings are briefly described as follows:

fig. 1 is a schematic cross-sectional structural view of a waterway structure of a motor of a new energy automobile according to the present invention;

fig. 2 is a schematic structural diagram of a shell assembly I of the waterway structure of the motor of the new energy automobile;

in the drawings, the reference numbers are respectively: 1. a motor housing; 2. a housing assembly; 3. a cooling water channel assembly; 4. a housing assembly outer layer; 5. a housing assembly inner layer; 6. a connecting strip; 7. a water inlet; 8. a water outlet; 9. a shell component I; 10. a housing assembly II; 11. a cooling water channel assembly I; 12. an outer layer of the shell component I; 13. the shell component I comprises an inner layer; 15. a cooling water channel component II; 16. an outer layer of the shell component II; 17. the shell component II is an inner layer; 20. a sealing surface of the shell component I; 21. a connecting seat I; 22. a sealing surface of the shell component II; 23. a connecting seat II; 26. connecting the end cover I with a joint face; 28. and the end cover II is connected with the surface.

Detailed Description

The following detailed description of the embodiments of the present invention, such as the shapes and structures of the components, the mutual positions and connection relations among the components, the functions and operation principles of the components, will be made by referring to the accompanying drawings and the description of the embodiments:

as shown in the attached drawings 1-2, the utility model relates to a waterway structure of a motor of a new energy automobile, new energy automobile motor waterway structure include motor casing 1, motor casing 1 includes two casing subassemblies 2, two casing subassemblies 2 are through connecting bolt fixed connection, 2 one end settings of every casing subassembly are to the inside cooling water course subassembly 3 that extends of this casing subassembly 2, cooling water course subassembly 3 sets up to be the U font structure for the cross-section, cooling water course subassembly 3 divide into casing subassembly 2 outer 4 and casing subassembly inlayer 5, the outer 4 of casing subassembly and the casing subassembly inlayer 5 of every casing subassembly 2 are connected through the connecting strip 6 of arranging along motor casing 1 axial, set up water inlet 7 on the outer 4 of casing subassembly of connecting strip 6 one side, set up delivery port 8 on the outer 4 of casing subassembly of connecting strip 6 opposite side, casing subassembly 2 sets up to integrated casting's structure. Above-mentioned structure adopts brand-new design to carry out arranging of motor casing's cooling water route, divide into two casing subassemblies with motor casing and process, adopts integral type casting machine-shaping respectively, simplifies the process. And the casing subassembly of integral type casting processing, one end terminal surface extend to casing subassembly in has the cooling water course subassembly, and the casing subassembly other end is the enclosed construction, like this, sets up seal gasket between two casing subassemblies, and then the lock is in the same place, connects through connecting bolt. In this way, a cooling water channel (cooling water channel) is formed, and the cooling water channel is sealed by only one sealing gasket, unlike the prior art in which the cooling water channel is formed by separately processing the motor shell and the two end covers and then connecting the two end covers. Compared with the two structures, the structure of the utility model not only simplifies the processing technology of the shell assembly, but also reduces the sealing difficulty of the cooling water channel, improves the sealing effect and has obvious advantages. Meanwhile, a welding process is not needed, and the problem that potential safety hazards exist due to air holes in welding parts does not exist naturally. And motor casing forms the motor with other part equipment after, and cooling water gets into from the water inlet, because the existence of connecting strip, the cooling water of entering can not flow to delivery port direction directly, but flows around the cooling water course that shell assembly skin 4 and shell assembly inlayer 5 formed, just can follow the delivery port and flow around motor casing a week back. Like this, casing assembly skin 4 and casing assembly inlayer 5 realize both reliable connections through the connecting strip, and the connecting strip has the effect of realizing the cooling water isolation, ensures that the cooling water flows just can flow a week. While the housing assembly outer layer 4, the housing assembly inner layer 5 and the connecting strips are in fact cast in one piece. The water path structure of the motor of the new energy automobile is simple in structure, the processing difficulty and the working procedures of the motor shell are effectively reduced through the change of the structure and the processing technology, only one cooling water path of the motor shell is sealed by the sealing gasket, sealing failure points are reduced, the probability of water leakage faults is reduced, welding is cancelled, air holes are avoided, and the overall quality and the use safety of the motor are improved.

Motor casing 1 include housing assembly I9 and housing assembly II 10, housing assembly I9 one end set up to the inside cooling water course subassembly I11 that extends of housing assembly I9, cooling water course subassembly I11 divide into housing assembly I skin 12 and housing assembly I inlayer 13 with housing assembly I9, connect through I connecting strip I that the axial was arranged between I skin 12 of housing assembly and the I inlayer 13 of housing assembly, connecting strip I plays divided effect, make the cooling water get into the back from water inlet 7, be kept apart by connecting strip I, then flow to the direction opposite with connecting strip I, until after flowing a week to another direction, get back to the opposite side that is close to connecting strip I again, flow from delivery port 8, realize a circulation. Casing subassembly II 10 one end sets up the cooling water course subassembly II 15 to the inside extension of casing subassembly II 10, and cooling water course subassembly II 15 divides casing subassembly II 10 into II outer 16 of casing subassembly and II inlayer 17 of casing subassembly, and II outer 16 of casing subassembly and II inlayer 17 of casing subassembly are connected through II connecting strips of axial arrangement. The connecting strip II plays a role in separation, so that cooling water is isolated by the connecting strip II after entering from the water inlet 7, then flows in the direction opposite to the connecting strip II until flowing in the other direction for a circle, returns to the other side close to the connecting strip II, and flows out from the water outlet 8, and circulation is achieved. Casing subassembly I9 and casing subassembly II 10 carry out the integral type casting respectively and process, then set up seal gasket, the lock is in the same place again, realizes reliably connecting through the bolt, and sealing reliability is high.

New energy automobile motor waterway structure's I skin 12 of casing assembly I one side of the connecting strip of casing assembly I9 on set up water inlet 7, set up delivery port 8 on the I skin 12 of casing assembly of I opposite side of connecting strip. Above-mentioned structure, water inlet and delivery port can set up on casing subassembly I9, and water inlet and delivery port are located I both sides of connecting strip respectively, and like this, the cooling water that the water inlet of being convenient for got into gets into behind the cooling water course, under the pressure effect, flows along motor casing a week, realizes that motor casing effectively cools off the cover, improves cooling efficiency.

A water inlet 7 is formed in the shell assembly II outer layer 16 on one side of the connecting strip II of the shell assembly II 10 of the new energy automobile motor waterway structure, and a water outlet 8 is formed in the shell assembly II outer layer 16 on the other side of the connecting strip II. Above-mentioned structure, water inlet and delivery port also can set up on II 10 of casing assembly, and water inlet and delivery port are located II both sides of connecting strip respectively, and like this, the cooling water that the water inlet of being convenient for got into gets into behind the cooling water course, under the pressure effect, flows along motor casing a week, realizes that motor casing effectively cools off the cover, improves cooling efficiency.

New energy automobile motor waterway structure's casing assembly I9 on set up the air flue I that pierces through connecting strip I, I one end port of air flue is close to water inlet 7, I other end port of air flue is close to delivery port 8. Above-mentioned structure, the selection of position is arranged to setting up and the air flue I of air flue I because when cooling water carries out cooling cycle, contain gas in the cooling water that gets into the cooling water course, gaseous resistance to cooling water production influences the reliable circulation that flows of cooling water. And I setting up of air flue after, the cooling water passes through the water inlet and gets into behind the cooling water course, because the resistance effect of connecting strip, the cooling water flows to connecting strip reverse direction, because this direction resistance is little, realize that the cooling water flows along motor casing a week, the gas in the cooling water, under the pressure effect, then get into air flue I, then directly communicate the delivery port, discharge from the delivery port, thereby effectively clear away the gas in the cooling water, gas can not flow along motor casing a week along with the cooling water, reduce the harmful effects of gas to the cooling water, and the cooling effect is improved. And air flue I is pore column structure, consequently, can realize gaseous the flowing through, but the cooling water is rarely flowed through to guarantee that the overwhelming majority cooling water can all flow along motor casing a week.

The I outer 12 surface of casing assembly I9 of motor casing 1 set up with the connecting seat I21 of the sealed face 20 parallel and level of the I sealed face of casing assembly, set up screw I on the connecting seat I21, II outer 16 of the casing assembly of casing assembly II 10 of motor casing 1 on set up the connecting seat II 23 with the sealed face 22 parallel and level of II sealed faces of casing assembly, set up screw II on the connecting seat II 23, connecting bolt passes screw I and screw II with casing assembly I9 and casing assembly II 10 fixed connection. And a sealing gasket is arranged between the sealing surface 20 of the shell assembly I9 and the sealing surface 22 of the shell assembly II 10. Above-mentioned structure, connecting seat I21 and connecting seat II 23 set up a plurality ofly respectively, and a plurality of connecting seats II 23 are arranged according to the clearance along motor casing a week, and a plurality of connecting seats I21 are arranged according to the clearance along motor casing a week, and the atress is even when being convenient for even a casing subassembly is connected. And the sealing performance between the two shell assemblies is reliably realized by the arrangement of the sealing gasket, water leakage is avoided, and only one sealing gasket is needed.

The connecting strip II of the shell assembly II 10 of the new energy automobile motor waterway structure is provided with an air passage II penetrating through the connecting strip II, one end port of the air passage II is close to the water inlet 7, and the other end port of the air passage II is close to the water outlet 8. Above-mentioned structure, when water inlet and delivery port set up at II 10 of casing subassembly, set up air flue II on connecting strip II. After II settings of air flue, the cooling water passes through the water inlet and gets into behind the cooling water course, because the resistance effect of connecting strip, the cooling water that gets into in the cooling water course flows to connecting strip reverse direction, because this direction resistance is little, thereby realize that the cooling water flows along motor casing a week usually, the gas in the cooling water, under the pressure effect, then get into air flue II, then directly communicate the delivery port, discharge from the delivery port, thereby effectively clear away the gas in the cooling water, gas can not flow along motor casing a week along with the cooling water, reduce the harmful effects of gas to the cooling water, and the cooling effect is improved. And the air channel II is of a fine-pore structure, so that the normal flow can be realized, and the cooling water rarely flows, thereby ensuring that most of the cooling water can flow along the circumference of the motor shell.

In the structure of the utility model, when the water inlet and the water outlet are close to the shell component sealing surface of the corresponding shell component, the connecting strip of each shell component can be respectively provided with an air passage, so that the two air passages are close to the water inlet, the air can conveniently pass through, and then the air is directly discharged from the water outlet. This structure improves the gas discharge efficiency without affecting the flow of the cooling water.

The other end of the shell assembly I9 is provided with an end cover I connecting surface 26, and the end cover I is fixedly connected with the end cover I connecting surface 26 through an end cover I connecting bolt. The other end of the shell assembly II 10 is provided with an end cover II connecting surface 28, and the end cover II is fixedly connected with the end cover II connecting surface 28 through an end cover II connecting bolt. Above-mentioned structure, cooling water course and end cover I and end cover II are kept apart, do not need motor casing and two end cover cooperations to form the cooling water course, and two end covers are connected respectively for the relevant part of installation does not have the sealed problem of end cover and motor casing joint portion. Therefore, only a single sealing gasket is used for water path sealing, and sealing failure points are reduced.

According to the new energy automobile motor waterway structure, a brand new design idea is adopted to arrange the cooling waterway of the motor shell, the motor shell is divided into two shell components to be processed, and the two shell components are respectively formed by integral casting, so that the process is simplified. And the casing subassembly of integral type casting processing, one end terminal surface extend to casing subassembly in has the cooling water course subassembly, and the casing subassembly other end is the enclosed construction, like this, sets up seal gasket between two casing subassemblies, and then the lock is in the same place, connects through connecting bolt. Therefore, the cooling water channel is formed, and only one sealing gasket is used for sealing the cooling water channel, unlike the prior art that the cooling water channel is formed by processing the motor shell and the two end covers respectively and then connecting the two end covers. Compared with the two structures, the structure of the utility model not only simplifies the processing technology of the shell assembly, but also reduces the sealing difficulty of the cooling water channel, improves the sealing effect and has obvious advantages. Meanwhile, a welding process is not needed, and the problem that potential safety hazards exist due to air holes in welding parts does not exist naturally. And motor casing forms the motor with other part equipment after, and cooling water gets into from the water inlet, because the existence of connecting strip, the cooling water that gets into can not flow to delivery port direction directly, but flows around the cooling water course that shell assembly skin and shell assembly inlayer formed, just can follow the delivery port and flow around motor casing a week back. Like this, the shell assembly skin passes through the connecting strip with the shell assembly inlayer and realizes both reliable connections, and the connecting strip has the effect of realizing the cooling water isolation, ensures that the cooling water flows just can flow a week. And the housing assembly outer layer, the housing assembly inner layer and the connecting strips are actually integrally cast. The water path structure of the motor of the new energy automobile is simple in structure, the processing difficulty and the working procedures of the motor shell are reduced through the change of the structure and the processing technology, only one cooling water path of the motor shell is sealed by the sealing gasket, sealing failure points are reduced, the probability of water leakage faults is reduced, welding is omitted, air holes are avoided, and the overall quality and the use safety of the motor are improved.

The present invention has been described in connection with the accompanying drawings, and it is to be understood that the utility model is not limited to the specific embodiments disclosed, but is intended to cover various modifications, changes and equivalents of the embodiments of the utility model, and its application to other applications without departing from the spirit and scope of the utility model.

Claims

1. The utility model provides a new energy automobile motor waterway structure which characterized in that: the water channel structure of the new energy automobile motor comprises a motor shell (1), wherein the motor shell (1) comprises two shell assemblies (2), the two shell assemblies (2) are fixedly connected through a connecting bolt, one end of each shell assembly (2) is provided with a cooling water channel assembly (3) extending towards the inside of the shell assembly (2), the cooling water channel assembly (3) is arranged to be of a U-shaped structure in cross section, the shell assemblies (2) are divided into a shell assembly outer layer (4) and a shell assembly inner layer (5) by the cooling water channel assembly (3), the shell assembly outer layer (4) and the shell assembly inner layer (5) of each shell assembly (2) are connected through a connecting strip (6) axially arranged along the motor shell (1), a water inlet (7) is formed in the shell assembly outer layer (4) on one side of the connecting strip (6), and a water outlet (8) is formed in the shell assembly outer layer (4) on the other side of the connecting strip (6), the shell component (2) is of an integrally cast structure.

2. The new energy automobile motor waterway structure of claim 1, wherein: the motor shell (1) comprises a shell component I (9) and a shell component II (10), one end of the shell component I (9) is provided with a cooling water channel component I (11) extending towards the interior of the shell component I (9), the cooling water channel component I (11) divides the shell component I (9) into an outer layer (12) of the shell component I and an inner layer (13) of the shell component I, the outer layer (12) of the shell component I and the inner layer (13) of the shell component I are connected through a connecting strip I which is axially arranged, casing assembly II (10) one end set up to casing assembly II (10) inside cooling water course subassembly II (15) that extend, cooling water course subassembly II (15) divide into casing assembly II (10) outer layer (16) and casing assembly II inlayer (17), casing assembly II outer layer (16) and casing assembly II inlayer (17) are connected through the II connecting strips that the axial was arranged.

3. The new energy automobile motor waterway structure of claim 2, wherein: new energy automobile motor waterway structure's I skin (12) of casing assembly of I one side of connecting strip of casing assembly I (9) on set up water inlet (7), set up delivery port (8) on I skin (12) of casing assembly of I opposite side of connecting strip.

4. The new energy automobile motor waterway structure of claim 2, wherein: a water inlet (7) is formed in the shell assembly II outer layer (16) on one side of the connecting strip II of the shell assembly II (10) of the new energy automobile motor waterway structure, and a water outlet (8) is formed in the shell assembly II outer layer (16) on the other side of the connecting strip II.

5. The new energy automobile motor waterway structure of claim 2 or 3, wherein: new energy automobile motor waterway structure's connecting strip I of casing subassembly I (9) on set up the air flue I that pierces through connecting strip I, I one end port of air flue is close to water inlet (7), I other end port of air flue is close to delivery port (8).

6. The new energy automobile motor waterway structure of claim 2, wherein: the outer surface of the I outer layer (12) of the shell assembly of the I (9) of the shell assembly of the motor shell (1) is provided with a connecting seat I (21) which is parallel and level to the I sealing surface (20) of the shell assembly, a screw hole I is arranged on the connecting seat I (21), a connecting seat II (23) which is parallel and level to the II sealing surface (22) of the shell assembly is arranged on the II outer layer (16) of the shell assembly of the II (10) of the motor shell (1), a screw hole II is arranged on the connecting seat II (23), and a connecting bolt penetrates through the screw hole I and the screw hole II to fixedly connect the shell assembly I (9) and the shell assembly II (10).

7. The new energy automobile motor waterway structure of claim 6, wherein: and a sealing gasket is arranged between the sealing surface (20) of the shell assembly I (9) and the sealing surface (22) of the shell assembly II (10).

8. The new energy automobile motor waterway structure of claim 4, wherein: the connecting strip II of the shell assembly II (10) of the new energy automobile motor waterway structure is provided with an air passage II penetrating through the connecting strip II, one end port of the air passage II is close to the water inlet (7), and the other end port of the air passage II is close to the water outlet (8).

9. The new energy automobile motor waterway structure of claim 2, wherein: the other end of the shell assembly I (9) is provided with an end cover I connecting surface (26), and the end cover I is fixedly connected with the end cover I connecting surface (26) through an end cover I connecting bolt.

10. The new energy automobile motor waterway structure of claim 2 or 9, wherein: the other end of the shell component II (10) is provided with an end cover II connecting surface (28), and the end cover II is fixedly connected with the end cover II connecting surface (28) through an end cover II connecting bolt.