CN115443007B

CN115443007B - A power supply device

Info

Publication number: CN115443007B
Application number: CN202211150302.8A
Authority: CN
Inventors: 申万增; 高大庆; 燕宏斌; 吴凤军; 黄玉珍; 陈万杰; 王晓俊; 王洁; 郭宏亮; 田海媚
Original assignee: Institute of Modern Physics of CAS
Current assignee: Institute of Modern Physics of CAS
Priority date: 2022-09-21
Filing date: 2022-09-21
Publication date: 2024-11-22
Anticipated expiration: 2042-09-21
Also published as: CN115443007A

Abstract

The present invention discloses a power supply device for powering a particle accelerator, the power supply device comprising: a cabinet, the cabinet is provided with a first installation compartment and a second installation compartment for wiring, the first installation compartment forms a first compartment, a second compartment and a third compartment adjacent to each other, the first compartment, the second compartment and the third compartment are all connected to the second installation compartment; an H-bridge module, the H-bridge module is installed in the first compartment and connected to the particle accelerator, and is used to switch the voltage polarity applied to the particle accelerator; a power supply module or a rectifier module, the power supply module or the rectifier module is installed in the second compartment and is electrically connected to the H-bridge module, the power supply module is used to provide energy, and the rectifier module is used to convert the input alternating current into direct current; and a controller module installed in the third compartment, which is used to control the working state of the H-bridge module. The technical solution of the present invention aims to realize the integrated arrangement of the particle accelerator power supply device, thereby realizing miniaturization and improving the convenience of use.

Description

Power supply device

Technical Field

The invention relates to the technical field of charging of particle accelerators, in particular to a power supply device.

Background

Power supply devices are commonly used to power devices, with different power attributes required by the devices. Some devices require direct current, some require alternating current, some require pulsed power, some require switching power attributes when in use, and often require more related components when configuring such power.

The accelerator power supply is an important device in the particle accelerator, and has the characteristics of high power, high current, higher current precision, higher stability and the like. Most accelerator power supply devices are nonstandard devices due to different working modes, internal structures, cooling modes and the like of the accelerator power supply.

At present, most of domestic and foreign high-power accelerator power supplies adopt distributed structures, so that the internal structure of the equipment is large in difference and large in size, and the operation and maintenance and the preparation of spare parts are inconvenient. The power supply device with a distributed structure has large volume and low power density, and the occupied area of equipment is large, so that the device is contradictory with the viewpoint of equipment miniaturization in the practical occasions of accelerators such as heavy ion cancer treatment. Meanwhile, along with the development of electronic science and technology and power electronic technology, accelerator power supplies also start to develop towards high power density, and the problems of heating, electromagnetic compatibility, poor reliability and the like of the power supplies are found in the operation process of the existing accelerator power supplies.

Disclosure of Invention

The invention aims to provide a power supply device which aims to realize integrated arrangement of a particle accelerator power supply device, thereby realizing miniaturization and improving convenience in use.

In order to achieve the above object, the present invention provides a power supply device for supplying power to a particle accelerator, the power supply device comprising:

the cabinet is provided with a first installation bin and a second installation bin for wiring, the first installation bin forms a first compartment, a second compartment and a third compartment which are mutually adjacent, and the first compartment, the second compartment and the third compartment are communicated with the second installation bin;

an H-bridge module mounted to the first compartment and electrically connected to the particle accelerator for switching a polarity of a voltage applied to the particle accelerator;

the power supply module or the rectifier module is arranged in the second compartment and is electrically connected with the H-bridge module, the power supply module is used for providing electric energy, and the rectifier module is used for converting input alternating current into direct current; and

And the controller module is arranged in the third compartment, is electrically connected with the H-bridge module and is used for controlling the working state of the H-bridge module.

In some embodiments of the invention, the H-bridge module comprises:

The shell is provided with a containing cavity, and the cavity wall of the containing cavity is provided with a through hole;

the laminated busbar is arranged in the accommodating cavity, is electrically connected with the power supply module or the rectifier module and is electrically connected with the controller module, and an interface of the laminated busbar is exposed out of the through hole;

The power module is electrically connected to the laminated busbar and used for power control;

The output filter inductance capacitor is electrically connected with the laminated busbar; and

And the power support capacitor is electrically connected with the laminated busbar.

In some embodiments of the invention, the cabinet comprises:

the main body of the cabinet, the cabinet body is provided with an accommodating space;

the first partition piece is connected to the cabinet body and divides the accommodating space into the first mounting bin and the second mounting bin; and

The second partition pieces are arranged on the first installation bin and divide the first installation bin into a first compartment, a second compartment and a third compartment.

In some embodiments of the invention, the first divider is removably connected to the cabinet body;

the second partition members are detachably arranged in the first mounting bin.

In some embodiments of the invention, the cabinet body has a plurality of first mounting locations, the first dividers being removably mounted to the first mounting locations;

The first installation bin is internally provided with a plurality of second installation positions, and each second partition piece is respectively installed at one second installation position.

In some embodiments of the invention, the first separator comprises:

the two ends of the support column are connected with the cabinet body; and

The support beams are uniformly distributed along the length direction of the support columns, one end of each support beam is connected with the cabinet body, and the other end of each support beam is connected with the support column;

each second partition piece is fixedly connected with one supporting beam.

In some embodiments of the invention, the support post and the plurality of support beams are further provided with a plurality of lightening holes.

In some embodiments of the present invention, a plurality of metal plates are detachably mounted on the outer side of the cabinet body, and the plurality of metal plates seal the accommodating space to avoid external electromagnetic interference.

In some embodiments of the invention, the power supply device further comprises a cooling system, wherein the cooling system is arranged at the upper part of the cabinet body and is used for cooling the accommodating space.

In some embodiments of the present invention, the cabinet further includes a door body, one side of the door body is rotatably connected to a side wall of the storage space opening, and the door body covers or opens the storage space during rotation.

According to the power supply device, the first installation bin and the second installation bin for wiring are arranged, the first compartment, the second compartment and the third compartment are further formed in the first installation cavity, the controller module, the power supply module and the H-bridge module are respectively arranged in the first compartment, the second compartment and the third compartment, and when the power supply device needs to be used, the controller module is electrically connected with the H-bridge module, so that the controller module controls the working state of the H-bridge module; the output of the power supply module or the rectifying module is connected to the input of the H bridge module through the copper bars, when the power supply module is adopted, the power supply module can be direct current or alternating current, or the rectifier module rectifies the current to form alternating current or direct current, so that the whole system is provided with energy. The H-bridge module is connected to the particle accelerator through a cable, so that a high-precision current waveform is output for the particle accelerator. Due to the adoption of the integrated arrangement mode, the distributed structure is prevented from being bloated, and the convenience of use is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view showing the structure of an embodiment in which a first mounting bin of a power supply device of a particle accelerator is located on the right side;

FIG. 2 is a schematic view of a first mounting bin of the power supply device of the present invention;

FIG. 3 is a schematic diagram of the power supply device of FIG. 2 from another perspective;

fig. 4 is a schematic view of a partial structure at a in fig. 3.

Reference numerals illustrate:

The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that all the directional indicators in the embodiments of the present invention are only used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture, and if the specific posture is changed, the directional indicators are correspondingly changed.

Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, the technical solutions of the embodiments of the present invention may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present invention.

The power supply device of the invention further forms a first compartment, a second compartment and a third compartment in the first installation cavity by arranging the first installation cabin and the second installation cabin for wiring, and then installs the controller module, the power supply module and the H-bridge module in the first compartment, the second compartment and the third compartment respectively, and when the power supply device is required to be used, the controller module is electrically connected with the H-bridge module, so that the controller module controls the working state of the H-bridge module; the output of the power supply module or the rectifying module is connected to the input of the H bridge module through the copper bars, when the power supply module is adopted, the power supply module can be direct current or alternating current, or the rectifier module rectifies the current to form alternating current or direct current, so that the whole system is provided with energy. The H-bridge module is connected to the particle accelerator through a cable, so that a high-precision current waveform is output for the particle accelerator. Due to the adoption of the integrated arrangement mode, the distributed structure is prevented from being bloated, and the convenience of use is improved.

The present invention proposes a power supply device 100 for supplying power to a particle accelerator.

Referring to fig. 1 to 4, the power supply apparatus 100 includes: a cabinet 10, the cabinet 10 being provided with a first mounting bin 11 and a second mounting bin 12 for wiring, the first mounting bin 11 forming a first compartment 111, a second compartment 112 and a third compartment 113 adjacent to each other, the first compartment 111, the second compartment 112 and the third compartment 113 being in communication with the second mounting bin 12; an H-bridge module 40, the H-bridge module 40 being mounted to the first compartment 111 and electrically connected to the particle accelerator for switching the polarity of the voltage applied to the particle accelerator; a power module 30 or a rectifier module, the power module 30 or the rectifier module being mounted in the second compartment 112 and being electrically connected to the H-bridge module 40; and a controller module 20, the controller module 20 being mounted to the third compartment 113 and electrically connected to the H-bridge module 40; for controlling the operating state of the H-bridge module 40.

The cabinet 10 is generally rectangular and is generally made of a sheet metal plate, and the cabinet 10 is provided with an electrical plug for electrically connecting with a power supply, and the electrical plug is generally led out from the bottom of the cabinet 10 so as to be conveniently plugged into the power supply. The cabinet 10 adopts a left-right sub-bin structure, namely a 600mm first installation bin 11 and a 200mm second installation bin 12, wherein the first installation bin 11 is used for arranging power parts such as an AC/DC module (namely a direct current/alternating current power supply module 30), an H-bridge module 40 and the like, and the second installation bin 12 is used for placing components such as an AC cable, a water collector and the like. The left and right bin dividing positions can be flexibly adjusted according to factors such as field conditions.

The H-bridge module 40 includes devices such as a supporting capacitor, a laminated busbar, a power IGBT and an output filter inductance capacitor. The H-bridge module 40 is a 4U height 19 inch standard chassis placed inside the 600mm first mounting bin 11 of the power cabinet 10. An H-bridge is a relatively simple circuit that typically includes four independently controlled switching elements (e.g., MOS-FETs) that are typically used to drive a load of relatively large current, by controlling the switching elements to be turned on and off differently to reverse the voltage across the load or output to which they are connected. The modules are divided into different current power class modules according to the accelerator power supply output current or power class. The modules with different levels are provided with the same external interface, have the characteristics of relative independence, universality and interchangeability, and the power supplies with different specifications are selected by the modules with different specifications, so that the design period of the accelerator power supply can be greatly reduced, the power density of the power supply is increased, and the like.

The AC/DC modules are 3U or 4U in height and can be placed inside a standard 19 inch cabinet, i.e., 600mm compartment of cabinet 10. This module is used to provide the required voltage for the supporting capacitor inside the accelerator power supply H-bridge. The module external interface is consistent with the H bridge module 40 interface, and is convenient to connect. The FPGA digital controller (i.e., the controller module 20) is used for controlling the operating state of the IGBTs in the H-bridge module 40, the failure state of the power supply, etc. The controller has complete communication function and good man-machine interface, the external interface is consistent with the H bridge or AC/DC module interface, and the external interface is directly connected by a straight line of DB 9. And, the dimensions of the first compartment 111, the second compartment 112 and the third compartment 113 may be set to be adjustable, so as to adapt to the increase or decrease of different functional modules and improve the adaptability of the power supply device 100.

The power supply device 100 of the present invention further forms a first compartment 111, a second compartment 112 and a third compartment 113 in the first installation cavity by providing the first installation cavity 11 and the second installation cavity 12 for wiring, and then installs the controller module 20, the power supply module 30 and the H-bridge module 40 in the first compartment 111, the second compartment 112 and the third compartment 113, respectively, and when in use, electrically connects the controller module 20 with the H-bridge module 40, thereby enabling the controller module 20 to control the working state of the H-bridge module 40; the output of the power module 30 or the rectifying module is connected to the input of the H-bridge module 40 through copper bars, and when the power module 30 is adopted, the power module 30 can be direct current or alternating current, or the current (including a battery power supply or industrial 380V or 10 KV) is rectified through the rectifier module to form alternating current or direct current, so that the whole system is provided with energy. The H-bridge module 40 is connected to the particle accelerator through a cable, so that the particle accelerator can be powered by the power supply device 100, and the distributed structure is prevented from being bulked due to the integrated arrangement mode, so that the convenience of use is improved. In this way, the power supply device 100 unifies, modularizes, and increases the power density of the distributed non-target accelerator power supply device 100.

In some embodiments of the present invention, the H-bridge module 40 includes: the shell is provided with a containing cavity, and the cavity wall of the containing cavity is provided with a through hole; the laminated busbar is arranged in the accommodating cavity, is electrically connected with the power module 30 or the rectifier module and is electrically connected with the controller module 20, and an interface of the laminated busbar is exposed to the through hole; the power module is electrically connected to the laminated busbar and used for power control; the output filter inductance capacitor is electrically connected to the laminated busbar; and the support capacitor is electrically connected to the laminated busbar. The H-bridge module 40, i.e., the control circuit having a circuit shape similar to the letter H, is called an "H-bridge". The laminated busbar is also called as a composite busbar, and is also called as a laminated busbar, a composite copper bar and English LAMINATED BUSBAR. The highway is a multilayer composite structure connection row and a highway of a power distribution system. The use of composite bus bars can provide modern, easily designed, quickly installed, and structurally sound power distribution systems, as compared to traditional, cumbersome, time consuming, and cumbersome wiring methods. Providing the H-bridge module 40 may better provide functional assistance for powering the particle accelerator.

Referring to fig. 2 and 3, in some embodiments of the invention, the cabinet 10 includes: the cabinet body 13, the cabinet body 13 forms the accommodation space; a first partition 14, the first partition 14 being connected to the cabinet body 13 to partition the accommodation space into a first mounting bin 11 and a second mounting bin 12; and a plurality of second partition members 15, the plurality of second partition members 15 being provided to the first mounting chamber 11 and partitioning the first mounting chamber 11 to form a first compartment 111, a second compartment 112, and a third compartment 113. The cabinet body 13 has a substantially rectangular parallelepiped structure, and is hollow, and has a housing space with one side open. The first separator 14 and the second separator 15 of the present embodiment may each be provided as a partition plate, and may specifically be a blind plate. The fixing mode of the sheet pile structure can be screw fixing, buckle fixing or other reasonable and effective fixing modes, so that the partition of the installation bin and the partition is realized. Through setting up first separator 14 and second separator 15 and rationally dividing the inner space of cabinet body 13 for power supply unit 100's part can be concentrated and settle, has avoided the occupation space of distributed arrangement big, has improved the convenience of use.

In some embodiments of the invention, the first divider 14 is detachably connected to the cabinet body 13; the mode of detachable connection is convenient for the user to set up first installation storehouse 11 and second installation storehouse 12 according to actual demand on the one hand, improves the suitability of rack 10 arrangement functional parts, and on the other hand is convenient for the transportation of power supply unit 100. The detachable connection mode can be threaded connection, clamping connection and the like. It will be appreciated that the cabinet body 13 includes a base, a side portion extending from a side of the base, and a top portion connected to the side portion and opposite to the base, the side portion, and the top portion being integrally formed, thus facilitating the manufacturing process at a lower cost. Or the base, the side part and the top can be arranged in a split way, so that the device is convenient to transport and use.

Referring to fig. 2 and 3, in some embodiments of the present invention, a plurality of second dividers 15 are removably disposed within the first mounting bin 11. Likewise, the detachable connection facilitates the user to set the first compartment 111, the second compartment 112 and the third compartment 113 according to actual demands, improves the suitability of the functional components of the cabinet 10 for placement, and facilitates the transportation of the power supply device 100. The detachable connection mode can be threaded connection, clamping connection and the like.

In some embodiments of the present invention, the cabinet body 13 has a plurality of first mounting locations, and the first partition 14 is detachably mounted at the first mounting locations; and/or, a plurality of second installation positions are arranged in the first installation bin 11, and each second partition piece 15 is respectively installed at one second installation position.

Referring to fig. 2 and 3, in some embodiments of the present invention, the first separator 14 includes: the support column 141, two ends of the support column 141 are connected with the cabinet body; the plurality of support beams 142 are uniformly distributed along the length direction of the support column 141, one end of each support beam 142 is connected to the cabinet body 13, and the other end of each support beam 142 is connected to the support column 141; each second partition 15 is fixedly connected to a support beam 142. The support columns 141 and the support beams 142 are arranged to separate the storage spaces, so that the functional devices of the particle accelerator power supply device 100 are well arranged. And the structure is stable, and the weight is lighter than that of the plate-shaped structure. In some embodiments, reinforcing ribs are further provided at both ends of the support column 141 and the support beam 142, and connect the support column 141 and the support beam 142. This can strengthen the overall stability of the first separator 14, thereby ensuring the stability of the power supply device 100 during charging and the reliability of the charging operation thereof. Optionally, two reinforcing ribs are provided, respectively located at two ends of the supporting beam 142/the supporting column 141 along the length direction, so as to further enhance the overall stability of the first partition 14, and further ensure the stability of the power supply device 100 during the charging process and the reliability of the charging operation thereof. In some embodiments of the present invention, the number of the supporting columns 141 may be plural, and the plurality of supporting columns 141 are spaced apart along the length direction of the supporting beam 142, thereby providing a good supporting effect for the supporting beam 142.

Further, the cabinet 10 further includes a door (not shown), one side of which is rotatably connected to the side wall of the opening of the storage space, and the door covers or opens the storage space during the rotation process. The setting of the door body can protect the functional element in the cabinet 10 effectively from the external environment, protect it, when the charging operation is needed or the taking-out operation is full, the door body is only required to be opened, and the door body is closed under normal state to close the storage space. In order to facilitate the opening and closing of the door body, a handle portion (not shown) may be provided on the surface of the door body facing away from the storage space. In order to be able to observe the charging operation inside, a display opening may be provided in the door body.

The power supply device 100 may further include at least one battery, which is a rechargeable battery, and the power supply can continuously supply power to the particle accelerator for a certain period of time without an external input power, so as to maintain the normal operation of the particle accelerator.

Further, universal wheels (not shown) are further disposed at the bottom of the cabinet 10, so that the power supply device 100 can be moved according to actual requirements, and the requirements of different areas can be met.

In some embodiments of the present invention, a plurality of lightening holes 1411 are also provided on the support post 141 and the plurality of support beams 142. By providing the lightening holes 1411, the mass of the first separator 14 can be made lighter, thereby facilitating assembly and use by a user.

In some embodiments of the present invention, a plurality of metal plates are detachably mounted on the outer side of the cabinet body 13, and the plurality of metal plates seal the accommodating space to avoid external electromagnetic interference. Electromagnetic shielding (electromagnetic shield) is the isolation of metal between two spatial regions to control the induction and radiation of electric, magnetic and electromagnetic waves from one region to another. Specifically, a shielding body is used for surrounding a component, a circuit, an assembly, a cable or an interference source of the whole system to prevent an interference electromagnetic field from diffusing outwards; the receiving circuit, device or system is surrounded by a shield to protect it from external electromagnetic fields. By isolating the inside of the cabinet body 13 from the outside, the functional period of the inside is not interfered by external electromagnetic waves, and the stability of the operation of the power supply device 100 is ensured.

Referring to fig. 1 to 3, in some embodiments of the present invention, the power supply apparatus 100 further includes a cooling system 50, and the cooling system 50 is disposed at an upper portion of the cabinet body 13 and is used for cooling the accommodating space. The cooling system 50 may be provided as an air conditioner. Since the power supply unit generally generates a certain amount of heat due to the electrothermal effect, the cooling system 50 is provided to cool down well, thereby improving the stability of the power supply device 100.

In an embodiment of the present invention, the cabinet 10 is provided with a heat dissipation port for dissipating heat generated during operation of the electrical components in the cabinet 10.

Specifically, the panel or the side portion of the cabinet body 13 is provided with a heat dissipation opening communicated with the storage space so as to dissipate heat generated by the electric element in the storage space, and the shape of the heat dissipation opening can be square, round, triangular or a grid structure, which is not limited herein.

In order to more effectively dissipate the heat generated by the electric element in the storage space, a heat dissipation fan may be further provided on an inner wall surface of the storage space, and the heat dissipation fan is provided adjacent to the heat dissipation opening. This allows the power supply device 100 to dissipate heat quickly, thereby ensuring its lifetime.

In some embodiments of the present invention, the power supply apparatus further includes a rectifier module 60, and the rectifier module 60 is disposed in electrical connection with the controller module 20, the power supply module 30, and the H-bridge module 40. By providing the rectifier module 60, the power supply can be rectified, facilitating the delivery of electrical energy. It will be appreciated that the rectifier module 60 may be positioned by further providing a fourth compartment to effect the positioning of the rectifier module.

The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.

Claims

1. A power supply device for supplying power to a particle accelerator, the power supply device comprising:

The controller module is arranged in the third compartment, is electrically connected with the H-bridge module and is used for controlling the working state of the H-bridge module;

the cabinet comprises:

The second partition pieces are arranged in the first installation bin and divide the first installation bin into a first compartment, a second compartment and a third compartment;

The first partition piece is detachably connected with the cabinet body; the plurality of second partition pieces are detachably arranged in the first mounting bin;

the cabinet body is provided with a plurality of first installation positions, and the first partition piece is detachably installed at the first installation positions; a plurality of second installation positions are arranged in the first installation bin, and each second partition piece is respectively installed at one second installation position;

The first compartment, the second compartment, and the third compartment are sized to be adjustable;

The integrated arrangement mode is adopted, and when the integrated arrangement device is used, the controller module is electrically connected with the H-bridge module, so that the controller module controls the working state of the H-bridge module; the output of the power supply module or the rectifying module is connected to the input of the H bridge module through a copper bar, when the power supply module is adopted, the power supply module is direct current or alternating current, or the current is rectified through the rectifier module to form alternating current or direct current, so that energy is provided for the whole system; the H-bridge module is connected to the particle accelerator through a cable, so that a high-precision current waveform is output for the particle accelerator.

2. The power supply apparatus of claim 1, wherein the H-bridge module comprises:

And the supporting capacitor is electrically connected with the laminated busbar.

3. The power supply device according to claim 1, wherein the first partition includes:

the two ends of the support column are connected with the cabinet body; and

each second partition piece is fixedly connected with one supporting beam.

4. A power supply device as claimed in claim 3, wherein said support post and a plurality of said support beams are further provided with a plurality of lightening holes.

5. A power supply device according to claim 3, wherein a plurality of metal plates are detachably mounted on the outside of the cabinet body, and the plurality of metal plates seal the accommodation space to prevent external electromagnetic interference.

6. The power supply device according to claim 5, further comprising a cooling system provided at an upper portion of the cabinet body for cooling the accommodating space.

7. The power supply device of claim 1, wherein the cabinet further comprises a door body, one side of the door body is rotatably connected to a side wall of the accommodating space opening, and the door body covers or opens the accommodating space during rotation.