Front end module

Abstract

The invention discloses a front-end module which comprises an installation frame and a first heat exchanger, and the installation frame is connected with the first heat exchanger. The first heat exchanger comprises a flat pipe and a first side plate, the first side plate comprises a first bottom plate part, a first turnup part and a second turnup part, the first bottom plate part and the flat pipe are arranged in the thickness direction of the flat pipe, and the two ends, opposite to the width direction, of the first bottom plate part are bent towards the mounting frame to form the first turnup part and the second turnup part; the mounting frame comprises a first connecting part, and at least one of the first bottom plate part, the first flanging part and the second flanging part is connected with the first connecting part. The connecting structures of the heat exchanger and the mounting frame are integrated to the first side plate, so that the connecting structures on the collecting pipe can be reduced, the size of the heat exchanger is reduced, and the structure of the front-end module is relatively compact.

Description

Technical Field

[0001] This application relates to the field of heat exchange technology, and more particularly to a front-end module for vehicle air conditioning. Background Technology

[0002] In related technologies, the front-end module includes a mounting frame and a heat exchanger. The heat exchanger includes a manifold, and the heat exchanger is connected to the mounting frame by a connection structure on the manifold. The manifold itself does not have a connection function; the connection between the manifold and the mounting frame requires an additional connection structure on the manifold, which increases the size of the heat exchanger and makes the front-end module less compact. Summary of the Invention

[0003] This application aims to provide a relatively compact front-end module.

[0004] An embodiment of this application provides a front-end module, including: a mounting frame and a first heat exchanger, wherein the mounting frame and the first heat exchanger are connected;

[0005] The first heat exchanger includes a flat tube and a first side plate. The first side plate includes a first base plate, a first flange, and a second flange. The first base plate and the flat tube are arranged along the thickness direction of the flat tube. The first flange and the second flange are respectively structures that are bent towards the mounting frame from opposite ends in the width direction of the first base plate.

[0006] The mounting frame includes a first connecting part, a first base plate part, a first flange part, and a second flange part, at least one of which is connected to the first connecting part.

[0007] The first side plate typically has a first flange and a second flange to improve its strength. The first flange, the first base plate, and the second flange form a "U"-shaped structure with an opening facing the mounting frame. This structure is well-suited for connecting the heat exchanger and the mounting frame. Therefore, this application integrates the connection structure between the heat exchanger and the mounting frame into the first side plate by connecting at least one of the first base plate, the first flange, and the second flange to the first connecting part. This reduces the size of the heat exchanger and makes the front-end module more compact. Attached Figure Description

[0008] Figure 1 This is a three-dimensional structural diagram of the front-end module of this application;

[0009] Figure 2 This application is Figure 1 The diagram shows the split structure of the front-end module.

[0010] Figure 3 This application is Figure 1 A schematic diagram of the split structure of the first heat exchanger of the front-end module shown;

[0011] Figure 4 This application is Figure 3 A three-dimensional structural schematic diagram of the first side plate of the first heat exchanger shown;

[0012] Figure 5 This application is Figure 1 A schematic diagram showing the connection between the first side plate and the first connecting part of the front-end module via a pin.

[0013] Figure 6 This application is Figure 5 Enlarged structural diagram at point A;

[0014] Figure 7 This application is Figure 5 Enlarged structural diagram at point B;

[0015] Figure 8 This application is Figure 5 A simplified structural diagram showing the pin connection between the first side plate and the first connecting part;

[0016] Figure 9 This application is Figure 1 The diagram shows the structure of the front-end module, where both the first and second heat exchangers are connected to the first connecting part via pins.

[0017] Figure 10 This application is Figure 1 A schematic diagram of the snap-fit ​​structure between the first side plate and the first connecting part of the front-end module shown;

[0018] Figure 11 This application is Figure 10 Enlarged structural diagram at point C;

[0019] Figure 12 This application is Figure 10 A simplified structural diagram showing the snap-fit ​​connection between the first side plate and the first connecting part;

[0020] Figure 13 This application is Figure 10 The diagram shown is a simplified structural diagram when the first connecting part is an elastic element;

[0021] Figure 14 This application is Figure 1 A schematic diagram showing the location of the first connection part of the front-end module;

[0022] Figure 15 This application is Figure 1 The diagram shows the positional relationship between the first and second connecting parts of the front-end module. Detailed Implementation

[0023] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0024] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0025] It should be understood that the terms "first," "second," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, "a" or "one," and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one; "multiple" indicates two or more. Unless otherwise stated, terms such as "front," "rear," "lower," and / or "upper" are for illustrative purposes only and are not limited to a location or spatial orientation. Terms such as "comprising" or "including" indicate that the elements or objects preceding "comprising" encompass the elements or objects listed following "comprising" or "including" and their equivalents, but do not exclude other elements or objects.

[0026] The front-end module of an exemplary embodiment of this application will now be described in detail with reference to the accompanying drawings. Unless otherwise specified, the features of the following embodiments and implementations can complement or combine with each other.

[0027] According to a specific embodiment of the front-end module of this application, such as Figure 1 and Figure 2 As shown, the front-end module includes a mounting frame 1 and a first heat exchanger 2, which are connected. The first heat exchanger 2 can be based on the structure of microchannel heat exchangers such as condensers, low-temperature water tanks, and intercoolers. The mounting frame 1 may include a fan cover, etc., and components such as the fan and the first heat exchanger 2 are mounted on the mounting frame 1.

[0028] like Figure 2 and Figure 3 As shown, the first heat exchanger 2 includes a manifold 21, a flat tube 22, and a side plate 23. The manifold 21, the flat tube 22, and the side plate 23 are all fixed relative to each other. That is, the manifold 21, the flat tube 22, and the side plate 23 can be directly fixedly connected, or they can be indirectly fixedly connected through other components.

[0029] like Figure 2 and Figure 3 As shown, there are at least two flat tubes 22, which are stacked along their respective thickness directions. The length direction of each flat tube 22 is substantially perpendicular to the length direction of the manifold 21. The manifold 21 includes a first manifold 211 and a second manifold 212. One end of each flat tube 22 along its length is connected to the first manifold 211, and the other end of each flat tube 22 along its length is connected to the second manifold 212. The first manifold 211 has a first manifold cavity 2111, the second manifold 212 has a second manifold cavity 2121, and the flat tube 22 has a flat tube cavity 221. Both the first manifold cavity 2111 and the second manifold cavity 2121 are connected to the flat tube cavity 221. When the first heat exchanger 2 is in operation, a working medium flows inside the first heat exchanger 2. The working medium is distributed into each flat tube cavity 221 by one of the first manifold cavity 2111 and the second manifold cavity 2121. When the working medium flows in the flat tube cavity 221, it can exchange heat with air, etc. Then, the working medium in each flat tube cavity 221 flows into the other of the first manifold cavity 2111 and the second manifold cavity 2121 and flows out of the first heat exchanger 2.

[0030] like Figure 3 and Figure 4 As shown, the side plate 23 includes a first side plate 24 and a second side plate 25. The flat tube 22, the first side plate 24, and the second side plate 25 are arranged along the thickness direction of the flat tube 22. The first side plate 24 and the second side plate 25 are located on opposite sides of all the flat tubes 22 along the thickness direction of the flat tube 22. The side plate 23 can protect the flat tube 22.

[0031] In related technologies, the manifold 21 is equipped with a connecting structure, and the first heat exchanger 2 is connected to the mounting frame 1 through the connecting structure on the manifold 21. It is understood that the manifold 21 is a pipe for the flow of the working medium; the manifold 21 itself does not have a connecting function, and its structure does not include a suitable connection structure. Connecting the first heat exchanger 2 to the mounting frame 1 via the connecting structure on the manifold 21 requires an additional connecting structure on the manifold 21, which increases the size of the first heat exchanger 2 and makes the front-end module less compact. Furthermore, for some types of heat exchangers, the manifold 21 can be manufactured using materials such as plastic. Adding a connecting structure to the manifold 21 inevitably has a negative impact on its strength, leading to a higher risk of damage and potential leakage of the working medium.

[0032] like Figure 3 and Figure 4As shown, the side plate 23 is typically provided with a flanged structure to improve its strength. Specifically, the first side plate 24 includes a first base plate portion 241, which is a long strip-shaped plate structure. The first base plate portion 241 and the flat tube 22 are arranged along the thickness direction of the flat tube 22. The thickness direction of the first base plate portion 241 and the thickness direction of the flat tube 22 are substantially parallel or substantially coincident. The length direction of the first base plate portion 241 and the length direction of the flat tube 22 are substantially parallel or substantially coincident. The first side plate 24 further includes a first flange 242 and a second flange 243. The first base plate 241 has a first end 2411 and a second end 2412, which are opposite ends in the width direction of the first base plate 241. The first base plate 241 is bent towards the mounting frame 1 at the first end 2411 to form the first flange 242, and the second base plate 241 is bent towards the mounting frame 1 at the second end 2412 to form the second flange 243. Wherein, as Figure 4 As shown, the width direction of the first base plate portion 241 is perpendicular to the length direction of the first base plate portion 241, and the width direction of the first base plate portion 241 is perpendicular to the thickness direction of the first base plate portion 241. The first side plate 24 can be a stamped part, that is, pressure is applied to the first side plate 24 of the sheet-like raw material to bend the first end 2411 of the first base plate portion 241 to form a first flange portion 242, and the first side plate 24 is bent at the second end 2412 of the first base plate portion 241 to form a second flange portion 243.

[0033] like Figures 5 to 8As shown, the inventors discovered through long-term research and development and practice that the first flange 242, the first base plate 241, and the second flange 243 form a "U"-shaped structure with an opening facing the mounting frame 1. This structure is very suitable as a connection structure between the first heat exchanger 2 and the mounting frame 1. Therefore, in this embodiment, the mounting frame 1 includes a first connecting part 11. At least one of the first base plate 241, the first flange 242, and the second flange 243 is connected to the first connecting part 11, so that the first heat exchanger 2 can be installed onto the mounting frame 1 through the first connecting part 11 and at least one of the first base plate 241, the first flange 242, and the second flange 243 connected to the first connecting part 11. The connection between at least one of the first base plate 241, the first flange 242, and the second flange 243 and the first connecting part 11 can be a fixed connection or a limiting connection using methods such as bolt connection, snap-fit ​​connection, or tongue-and-groove fit connection. This structure integrates the connection structure between the first heat exchanger 2 and the mounting frame 1 into the first side plate 24. Compared with related technologies, this structure reduces the number of connection structures on the manifold 21, thereby reducing the size of the first heat exchanger 2 and making the front-end module more compact. At the same time, the structure of the first side plate 24 is simpler than that of the manifold 21, and its functionality is also simpler. Compared to setting connection structures on the manifold 21, setting connection structures on the first side plate 24 has less impact on the first heat exchanger 2, and the process of setting connection structures on the first side plate 24 is simple and the manufacturing cost is lower. Furthermore, all end faces of the first side plate 24 are relatively flat. For example, the end faces at both ends of the first base plate 241 in the opposite thickness direction, the end faces at both ends of the first flange 242 in the opposite thickness direction, and the end faces at both ends of the second flange 243 in the opposite thickness direction are all relatively flat and have a large area, making them suitable as connection end faces between the first heat exchanger 2 and the mounting frame 1, and ensuring the connection strength between the first heat exchanger 2 and the mounting frame 1. Moreover, the first side plate 24 is usually made of metal materials such as aluminum and / or aluminum alloy. Compared with the plastic manifold 21, the connection strength between the first heat exchanger 2 and the mounting frame 1 through the first side plate 24 is higher, improving the reliability of the front-end module.

[0034] Similarly, the second side plate 25 includes a second bottom plate portion 251, which is a long strip-shaped plate structure. The second bottom plate portion 251 and the flat tube 22 are arranged along the thickness direction of the flat tube 22. The first bottom plate portion 241 and the second bottom plate portion 251 are located on opposite sides of the thickness direction of the flat tube 22, respectively. The thickness direction of the second bottom plate portion 251 is basically parallel or basically coincident with the thickness direction of the flat tube 22, and the length direction of the second bottom plate portion 251 is basically parallel or basically coincident with the length direction of the flat tube 22. The second side plate 25 further includes a third flange 252 and a fourth flange 253. The second bottom plate 251 has a third end 2511 and a fourth end 2512, which are opposite sides of the width direction of the second bottom plate 251. The second bottom plate 251 is bent towards the mounting frame 1 at the third end 2511 to form the third flange 252, and the second bottom plate 251 is bent towards the mounting frame 1 at the fourth end 2512 to form the fourth flange 253. The mounting frame 1 includes a second connecting part 13, and at least one of the second bottom plate 251, the third flange 252, and the fourth flange 253 is connected to the second connecting part 13. The width direction of the second bottom plate 251 is perpendicular to the length direction of the second bottom plate 251, and the width direction of the second bottom plate 251 is perpendicular to the thickness direction of the second bottom plate 251. The second side plate 25 can be a stamped part, that is, pressure is applied to the second side plate 25 of the sheet-like raw material, causing the second side plate 25 to bend at the third end 2511 of the second base plate 251 to form a third flange 252, and the second side plate 25 to bend at the fourth end 2512 of the second base plate 251 to form a fourth flange 253. In this embodiment, the first side plate 24 is used as an example for explanation. The structure, performance and effect of the second side plate 25 can be referred to the first side plate 24, and will not be repeated here. Of course, the mounting frame 1 can also be connected to only one of the first side plate 24 and the second side plate 25, which can also reduce the additional connection structure, reduce the size of the first heat exchanger 2 and make the front-end module more compact.

[0035] like Figures 10 to 13As shown, in a first alternative embodiment, the first connecting portion 11 and the first side plate 24 are snapped together, providing good connection strength and ensuring the reliability of the connection between the first heat exchanger 2 and the mounting frame 1. The first side plate 24 has a first groove 244 located between the first bottom plate portion 241, the first flange portion 242, and the second flange portion 243. The first groove 244 extends along the length of the first side plate 24. The first bottom plate portion 241 forms the groove wall at the bottom of the first groove 244, and the first flange portion 242 and the second flange portion 243 are the groove walls on both sides of the first groove 244, respectively. The mounting frame 1 includes a first wall portion 12 located at the position where the mounting frame 1 faces the opening of the first groove 244. The first connecting portion 11 is connected to the first wall portion 12, and the first connecting portion 11 is at least partially located in the first groove 244. The first connecting portion 11 is connected to the first flange portion 242, and the first connecting portion 11 is connected to the second flange portion 243. The first flange portion 242 and the second flange portion 243 can restrict the movement of the first connecting portion 11 along the thickness direction of the first flange portion 242, thereby restricting the relative movement of the first heat exchanger 2 and the mounting frame 1 along the thickness direction of the first flange portion 242. The first connecting portion 11 is connected to the first base plate portion 241, and the first connecting portion 11 can restrict the movement of the first base plate portion 241 along the thickness direction of the first base plate portion 241, thereby restricting the movement of the first heat exchanger 2 and the mounting frame 1 along the thickness direction of the first base plate portion 241. Alternatively, the first flange 242 is connected to the first wall 12, and the second flange 243 is also connected to the first wall 12. The first wall 12 can restrict the movement of the first flange 242 and the second flange 243 along the thickness direction of the first base plate 241, thereby restricting the movement of the first heat exchanger 2 and the mounting frame 1 along the thickness direction of the first base plate 241. The mounting frame 1 is typically made of plastic. The first connecting part 11 and the first wall 12 can be integrally injection molded to facilitate the formation of the first connecting part 11 on the first wall 12. The first groove 244 has a first groove cavity 2441 located between the first connecting part 11 and the first wall 12. The first connecting part 11 can be an elastic element, such as an elastic buckle, to facilitate the connection between the first heat exchanger 2 and the mounting frame 1. Furthermore, the elastic connection between the first heat exchanger 2 and the mounting frame 1 reduces the risk of damage.

[0036] like Figures 5 to 8As shown, in a second alternative embodiment, the first connecting portion 11 and the first side plate 24 are connected by a pin. Specifically, the first side plate 24 has a first through hole 245, which extends through at least one of the first flange portion 242 and the second flange portion 243 along the width direction of the first bottom plate portion 241. The first connecting portion 11 is an elongated pin-shaped structure, at least partially located in the first through hole 245, and the sidewalls of the first connecting portion 11 and the first through hole 245 provide a limiting connection. The pin connection method, by inserting the first connecting portion 11 into the first through hole 245, completes the connection between the first connecting portion 11 and the first side plate 24, simplifying the assembly of the first heat exchanger 2 and the mounting frame 1.

[0037] like Figure 9 As shown, at least two heat exchangers are typically mounted on the mounting frame 1, meaning the front-end module includes a second heat exchanger 3. Since the dimensions of the first heat exchanger 2 along the length and thickness of the first base plate 241 are significantly larger than its width, the first heat exchanger 2 and the second heat exchanger 3 are typically arranged along the width of the first base plate 241 to ensure a more reasonable overall size and facilitate installation on the mounting frame 1. The second heat exchanger 3 has a second through-hole 31, the extension direction of which substantially coincides with the extension direction of the first through-hole 245. The first connecting portion 11 is also at least partially located within the second through-hole 31, and the sidewalls of the first connecting portion 11 and the second through-hole 31 provide a limiting fit. This structure allows both the first heat exchanger 2 and the second heat exchanger 3 to be connected to the mounting frame 1 using the same first connecting portion 11, thereby further improving the integration of the front-end module and simplifying its structure. It is understandable that the first heat exchanger 2 and the second heat exchanger 3 can be of the same or different types. For example, when the first heat exchanger 2 is a condenser, the second heat exchanger 3 can be a condenser for flowing refrigerant or a tank for flowing coolant. However, the side plates 23 of the first heat exchanger 2 and the second heat exchanger 3 generally overlap in position. That is, the first plane 4 is defined, and the width direction of the first plane 4 is perpendicular to that of the first base plate 241. The projections of the side plates 23 of the first heat exchanger 2 and the second heat exchanger 3 onto the first plane 4 at least partially overlap. Therefore, the second through hole 31 can also be located on the side plate 23 of the second heat exchanger 3. Of course, the second through hole 31 can also be located on other parts of the second heat exchanger 3.

[0038] like Figure 14As shown, in one alternative embodiment, the number of first connecting parts 11 is N, and the N first connecting parts 11 are respectively located at positions that divide the first side plate 24 approximately N+1 times along its length. For example, when the number of first connecting parts 11 is 2, the first side plate 24 includes a first part 246, a second part 247, and a third part 248, and the first connecting parts 11 include a first first connecting part 111 and a second first connecting part 112. The first part 246, the second part 247, and the third part 248 are arranged along the length direction of the first side plate 24. The first part 246 and the second part 247 are respectively connected to the two ends of the first first connecting part 111 opposite to the two ends of the first side plate 24 along its length direction, and the second part 247 and the third part 248 are respectively connected to the two ends of the second first connecting part 112 opposite to the two ends of the first side plate 24 along its length direction. The dimensions of the first part 246, the second part 247, and the third part 248 along the length direction of the first side plate 24 are all substantially the same to each other. The structure provides a more uniform stress distribution at the connection between the first heat exchanger 2 and the mounting frame 1, which can reduce the vibration of the heat exchanger 2 and give it better balance. It can also reduce the risk of damage to the heat exchanger 2 and / or the mounting frame 1 due to stress concentration.

[0039] The number of second connecting parts 13 can be the same as or different from the number of first connecting parts 11; the position of the second connecting parts 13 can be located at the corresponding position of the first connecting parts 11, or it can be located at other positions. For example... Figure 15 As shown, optionally, the number of first connecting parts 11 is at least two, that is, the first connecting parts 11 include at least a first first connecting part 111 and a second first connecting part 112, the position of the first first connecting part 111 is the first position, and the position of the second first connecting part 112 is the second position. The number of second connecting parts 13 is at least one, and the position of at least one second connecting part 13 is the third position. The figure formed by the lines connecting the first position, the second position and the third position is a triangle, preferably an isosceles triangle or an equilateral triangle, so as to give the first heat exchanger 2 better stability after installation.

[0040] As an alternative embodiment, the first connecting part 11 and the first side plate 24 are connected by a pin, and the second connecting part 13 and the second side plate 25 are snapped together. This allows for a high degree of integration of the front-end module while ensuring a more reliable connection between the first heat exchanger 2 and the mounting frame 1.

[0041] In this application, at least one of the first base plate 241, the first flange 242, and the second flange 243 is connected to the first connecting part 11, and the connection structure of the first heat exchanger 2 and the mounting frame 1 is integrated into the first side plate 24. Compared with related technologies, the connection structure on the manifold 21 can be reduced, thereby reducing the size of the first heat exchanger 2 and making the structure of the front-end module more compact.

[0042] The above description is merely a typical embodiment of this application and is not intended to limit this application in any way. Although this application has been disclosed above with typical embodiments, it is not intended to limit this application. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the technical solution of this application. Any simple modifications, equivalent changes and alterations made to the above technical solution based on the technical essence of this application without departing from the content of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A front end module characterized by, The front end module comprises: a mounting frame and a first heat exchanger, the mounting frame and the first heat exchanger being connected; the first heat exchanger comprises a flat tube and a first side plate, the first side plate comprises a first bottom plate part, a first flange part and a second flange part, the first bottom plate part and the flat tube are arranged along the thickness direction of the flat tube, the first flange part and the second flange part are respectively structures bent towards the mounting frame from two ends of the first bottom plate part in the width direction; the mounting frame comprises a first connecting part, at least one of the first bottom plate part, the first flange part and the second flange part is connected with the first connecting part.

2. The front end module of claim 1, wherein, The first connecting part and the first side plate are connected by a pin. The first side plate has a first through hole, the first through hole penetrates at least one of the first flange part and the second flange part along the width direction of the first bottom plate part, the first connecting part is at least partially located in the first through hole, and the first connecting part and the side wall of the first through hole are limitingly connected.

3. The front end module of claim 2, wherein, The front end module comprises a second heat exchanger, the first heat exchanger and the second heat exchanger are arranged along the width direction of the first bottom plate part, the second heat exchanger has a second through hole, the first connecting part is also at least partially located in the second through hole, and the first connecting part and the side wall of the second through hole are limitingly connected.

4. The front end module of claim 1, wherein, The first connecting part and the first side plate are connected by a clamping. The first side plate has a first slot, the first bottom plate part is the bottom wall of the first slot, and the first flange part and the second flange part are the side walls of the first slot. The mounting frame comprises a first wall part, the first wall part is located at the position of the mounting frame towards the first slot, the first connecting part is connected with the first wall part, the first connecting part is at least partially located in the first slot, and the first connecting part is connected with at least one of the first flange part and the second flange part.

5. The front end module of claim 4, wherein, The first connecting part and the first bottom plate part are connected. Or, at least one of the first flange part and the second flange part is connected with the first wall part.

6. The front end module of claim 4 or 5, the mounting frame has a deformation cavity, the first connecting part, the deformation cavity and the first wall part are arranged along the thickness direction of the first bottom plate part, and the first connecting part is an elastic member.

7. Front end module according to any of claims 1 to 6, characterized in that The number of the first connecting parts is N, and N first connecting parts are respectively located at positions equally dividing the first side plate along the length direction.

8. The front end module of claim 1, wherein, The first heat exchanger comprises a second side plate, the second side plate comprises a second bottom plate part, a third flange part and a fourth flange part, the second bottom plate part and the flat tube are arranged along the thickness direction of the flat tube, the first bottom plate part and the second bottom plate part are respectively located on two sides of the flat tube in the thickness direction, the third flange part and the fourth flange part are respectively structures bent towards the mounting frame from two ends of the first bottom plate part in the width direction, and the mounting frame comprises a second connecting part, at least one of the second bottom plate part, the third flange part and the fourth flange part is connected with the second connecting part.

9. The front end module of claim 8, wherein, The first connecting part is connected with the first side plate by insertion, and the second connecting part is connected with the second side plate by clamping.

10. The front end module of claim 8, wherein, The first connecting part comprises a first first connecting part and a second first connecting part, the first first connecting part is located at a first position, the second first connecting part is located at a second position, the second connecting part is located at a third position, and the first position, the second position and the third position form a triangle.

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