Gas-liquid composite cooling type electronic window
By using a gas-liquid hybrid cooling electronic window, the problem of insufficient heat dissipation of the electronic window is solved by combining liquid cooling and gas cooling. This improves heat dissipation efficiency and electron flow intensity, extends equipment life, and reduces maintenance costs and safety risks.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- KUNSHAN HUAQING JIA GAONENG ELECTRONIC TECHNOLOGY CO LTD
- Filing Date
- 2026-01-14
- Publication Date
- 2026-04-28
AI Technical Summary
Existing electronic windows rely on a single heat dissipation method, which makes the window panes prone to damage and limits the electron flow.
The electronic window adopts a gas-liquid composite cooling type. By simultaneously cooling the liquid and gas components and combining them with the adjustment components, the electronic window is dually cooled, the airflow exchange range is adjusted, and overcooling or overheating is avoided.
It improves the heat dissipation efficiency of electronic windows, enhances the electron flow intensity, extends equipment life, and reduces maintenance costs and safety risks.
Smart Images
Figure CN121940947A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of particle accelerator technology, and in particular to a gas-liquid composite cooling type electronic window. Background Technology
[0002] Electron windows are key components in electron accelerators for electron beam applications. In industrial and scientific fields such as radiation processing, sterilization, and material modification, the electron beam generated by the accelerator needs to be drawn from the internal high vacuum environment to the external atmosphere or a specific process cavity. The electron window is installed at the end of the accelerator tube to isolate the ultra-high vacuum from the atmospheric pressure while allowing the electron beam to pass through. Its core is the use of extremely thin window materials (such as micron-sized titanium foil or diamond film) to minimize electron beam scattering and energy loss.
[0003] In the process of intercepting and blocking high-speed electrons, the window will bear a huge concentrated heat load. If its heat dissipation capacity is insufficient, the window temperature will rise sharply, leading to a decrease in material strength, creep, oxidation, or even melting. Once the window fails, it will cause the accelerator vacuum to be destroyed, resulting in system shutdown, high maintenance costs, and safety risks. Therefore, the heat dissipation efficiency of the electron window is the bottleneck in its design and application. Improving its cooling capacity is the core technical challenge to overcome the beam intensity limit and extend the equipment life.
[0004] Currently, the mainstream cooling method for electronic windows is single-medium cooling, such as circulating water cooling. However, traditional liquid cooling channels are usually located on the periphery of the window support structure, which is a certain distance from the high heat load area in the center of the window. This results in a large thermal resistance and insufficient targeted cooling efficiency for millimeter-level hot areas. If pure air cooling is used, although it can directly blow on the surface of the window, its heat capacity is small and it cannot handle continuous high heat loads on its own. As a result, the electron flow intensity exported by the electronic window is limited. Summary of the Invention
[0005] In view of the fact that the heat dissipation methods in the above or existing technologies are relatively simple and the electronic window is easily damaged, thereby limiting the electron flow intensity led out by the electronic window, the present invention is proposed.
[0006] Therefore, the object of the present invention is to provide a gas-liquid composite cooling type electronic window.
[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution:
[0008] A gas-liquid composite cooling type electronic window includes a mounting flange and a mounting seat disposed on the upper end face of the mounting flange;
[0009] And cooling components, including liquid cooling components and air cooling components;
[0010] The liquid cooling component includes an electronic window disposed on the outside of the mounting flange, an electronic window piece integrally formed on the inner wall of the electronic window, and a coolant channel opened inside the mounting base.
[0011] Furthermore, the air-cooling component also includes a first air intake channel and a second air intake channel formed inside the mounting base;
[0012] And, the adjustment component includes a plurality of support blocks arranged in a ring on the inner wall of the electronic window and a sliding block disposed on the inner side of the support blocks;
[0013] The liquid cooling component and the air cooling component are used to achieve simultaneous liquid cooling and air cooling. The electronic window is cooled by the gas-liquid composite cooling, which also increases the electron outflow intensity. The air cooling component provides kinetic energy to the adjustment component. In conjunction with the air pressure, the airflow exchange range above the electronic window is adjusted to avoid the surface of the electronic window being too cold or too hot.
[0014] As a preferred embodiment of the gas-liquid composite cooling type electronic window of the present invention, the liquid cooling component further includes an inlet pipe and an outlet pipe disposed on both sides of the end face of the mounting base, wherein the inlet pipe and the outlet pipe are hollow and connected to the coolant channel.
[0015] In a preferred embodiment of the gas-liquid composite cooling type electronic window of the present invention, a water jacket is provided inside the mounting base, and a cavity is also provided inside the mounting base.
[0016] In a preferred embodiment of the gas-liquid composite cooling type electronic window of the present invention, the coolant channel is connected to the cavity, and both the coolant channel and the cavity are located below the upper surface of the electronic window.
[0017] As a preferred embodiment of the gas-liquid composite cooling type electronic window of the present invention, the gas cooling component further includes an air inlet pipe disposed on one side of the end face of the mounting base, and the air inlet pipe is connected to the first air inlet channel.
[0018] As a preferred embodiment of the gas-liquid composite cooling type electronic window of the present invention, the first air intake channel and the second air intake channel are connected, the first air intake channel is a bent design, and the second air intake channel is an inclined design with its bottom facing the center of the electronic window.
[0019] As a preferred embodiment of the gas-liquid composite cooling electronic window of the present invention, an external air nozzle and an internal air nozzle are respectively provided on the upper and lower sides of the outer walls of the first air inlet channel and the second air inlet channel, and the air inlet pipe, the internal air nozzle and the external air nozzle together form a cooling circuit.
[0020] In a preferred embodiment of the gas-liquid composite cooling type electronic window of the present invention, the adjustment component further includes an inner cavity formed on the outer wall of the support block, and the sliding block can move inside the support block through the inner cavity.
[0021] In a preferred embodiment of the gas-liquid composite cooling type electronic window of the present invention, the end face of the sliding block is in contact with the inner wall of the electronic window, the inner wall of the support block is provided with a spring, and the end of the spring is disposed on the end face of the sliding block.
[0022] In a preferred embodiment of the gas-liquid composite cooling type electronic window of the present invention, a fixed block is provided on the outer wall of the support block, a movable plate is provided on the inner wall of the electronic window, and the outer wall of the movable plate is located inside the fixed block.
[0023] The beneficial effects of the gas-liquid composite cooling type electronic window of the present invention are as follows: The present invention achieves simultaneous liquid cooling and gas cooling through liquid cooling components and gas cooling components. The gas-liquid composite cooling dissipates heat from the electronic window, while increasing the electron outflow intensity. Furthermore, the gas cooling component provides kinetic energy for the adjustment component. In conjunction with the air pressure, the airflow exchange range above the electronic window is adjusted to avoid the electronic window surface from becoming too cold or too hot. Attached Figure Description
[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0025] Figure 1 This is a schematic diagram of the overall structure of a gas-liquid composite cooling type electronic window.
[0026] Figure 2 This is a schematic diagram of the cooling component structure of a gas-liquid composite cooling type electronic window.
[0027] Figure 3 This is a schematic diagram of the liquid cooling component structure of a gas-liquid composite cooling type electronic window.
[0028] Figure 4 This is a schematic diagram of the air-cooling component structure of a gas-liquid composite cooling type electronic window.
[0029] Figure 5 For a gas-liquid composite cooling type electronic window Figure 4 Enlarged structural diagram at point A in the middle.
[0030] Figure 6This is a schematic diagram of the electronic window structure of a gas-liquid composite cooling type electronic window.
[0031] Figure 7 This is a schematic diagram of the adjustment component structure of a gas-liquid composite cooling type electronic window.
[0032] In the diagram, 1. Mounting flange; 2. Mounting base; 3. Cooling assembly; 31. Liquid cooling component; 311. Electronic window; 312. Water inlet pipe; 313. Water outlet pipe; 314. Coolant channel; 315. Water jacket; 316. Cavity; 317. Electronic window; 32. Air cooling component; 321. Air inlet pipe; 322. First air inlet channel; 323. Second air inlet channel; 324. Inner air nozzle; 325. Outer air nozzle; 4. Adjustment assembly; 41. Support block; 42. Inner cavity; 43. Spring; 44. Sliding block; 45. Fixed block; 46. Movable plate. Detailed Implementation
[0033] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0034] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.
[0035] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.
[0036] Example 1
[0037] Reference Figures 1 to 7 This is the first embodiment of the present invention, which provides a gas-liquid composite cooling type electronic window that can achieve the effect of cooling the electronic window by the coolant.
[0038] Specifically, a gas-liquid composite cooling type electronic window includes a mounting flange 1 and a mounting base 2 fixedly connected to the upper end face of the mounting flange 1; wherein, the mounting flange 1 and the mounting base 2 together provide a support platform for the cooling component 3 and the adjustment component 4. The mounting flange 1 is a welded structure or a detachable standard vacuum flange, while the mounting base 2 is cylindrical in shape to ensure the normal operation of the cooling structure.
[0039] In addition, the cooling component 3 includes a liquid cooling component 31 and an air cooling component 32; wherein the liquid cooling component 31 and the air cooling component 32 together form an air-cooled composite cooling channel to achieve dual cooling of the electronic window.
[0040] The liquid cooling component 31 includes an electronic window 311 disposed on the outside of the mounting flange 1, an electronic window plate 317 integrally formed on the inner wall of the electronic window 311, and a coolant channel 314 opened inside the mounting base 2. The electronic window 311 is circular in appearance and has an H-shaped cross-section with the electronic window plate 317. Electrons need to pass through the electronic window plate 317. The material of the electronic window plate 317 is not limited to titanium, but also includes materials such as ceramic, diamond, and sapphire.
[0041] Furthermore, the air-cooled component 32 also includes a first air intake channel 322 and a second air intake channel 323 opened inside the mounting base 2; wherein, the first air intake channel 322 and the second air intake channel 323 are connected. Since the air-cooled component 32 is designed on one side and the air intake channel inside the air-cooled component 32 does not contact the coolant channel 314 of the liquid-cooled component 31, the two interfere with each other.
[0042] And, the adjustment component 4 includes multiple support blocks 41 arranged in a ring on the inner wall of the electronic window 311 and sliding blocks 44 slidably connected to the inner side of the support blocks 41; wherein, the adjustment component 4 should be located above the electronic window 317, and the support blocks 41 are designed in multiple groups. When the rotation angle of the movable plate 46 is the lowest, the distance between each group of support blocks 41 and sliding blocks 44 is the farthest, and the opening range formed by multiple support blocks 41 is also the largest at this time, thereby minimizing the airflow rate above the electronic window 317.
[0043] The liquid cooling component 31 and the air cooling component 32 are used to achieve simultaneous liquid cooling and air cooling. The electronic window is cooled by the gas-liquid composite cooling, which also increases the electron outflow intensity. The air cooling component 32 provides kinetic energy to the adjustment component 4. In conjunction with the air pressure, the airflow exchange range above the electronic window 317 is adjusted to avoid the surface of the electronic window 317 from being too cold or too hot.
[0044] Furthermore, the liquid cooling component 31 also includes an inlet pipe 312 and an outlet pipe 313 connected to both sides of the end face of the mounting base 2. Both the inlet pipe 312 and the outlet pipe 313 are hollow and connected to the coolant channel 314. The inlet pipe 312 and the outlet pipe 313 are symmetrically distributed and located at both ends of the outer wall of the mounting base 2. The coolant channel 314 penetrates the mounting base 2 and is connected to the inlet pipe 312 and the outlet pipe 313 at both ends, so that the inlet pipe 312, the coolant channel 314, the cavity 316 and the outlet pipe 313 together form the coolant flow path to achieve liquid cooling.
[0045] It should be noted that the mounting base 2 has a water jacket 315 inside, and a cavity 316 is also provided inside the mounting base 2. The coolant channel 314 is connected to the cavity 316, and both the coolant channel 314 and the cavity 316 are located below the upper surface of the electronic window 311. The water jacket 315 is designed in two sets, located at the bottom of both sides of the electronic window 311, and the water jacket 315 is used to wrap the coolant. The cavity 316 is located on the outside of the electronic window 311, so that the electronic window structure is completely immersed in the coolant. At the same time, the two are close to each other, so the cooling is fast and sufficient. It should be noted that the coolant channel 314 and the cavity 316 need to be located below the electronic window 311 to prevent the coolant from entering the surface of the electronic window plate 317.
[0046] In use, the mounting base 2 is fixedly installed on the upper end face of the mounting flange 1. When the electronic window 311 needs to be cooled, the coolant is sent into the cavity 316 through the inlet pipe 312 using a corresponding water pump or other power equipment. Since the cavity 316 is distributed around the electronic window 311, when the coolant enters the cavity 316, it comes into contact with the outer wall of the electronic window 311, thereby achieving a liquid cooling effect on the electronic window. The outlet pipe 313 on the other side is also connected to the coolant channel 314. The flowing coolant carries away the heat energy attached to the outer wall of the electronic window, achieving a certain degree of cooling and heat dissipation.
[0047] In summary, by utilizing the inlet pipe 312 and outlet pipe 313 designed in the same direction, and combining them with the coolant channel 314 and cavity 316 to form a liquid cooling channel, liquid cooling heat dissipation is achieved, forming the first layer of heat dissipation for the electronic window.
[0048] Example 2
[0049] Reference Figures 1-5 This is the second embodiment of the present invention. Unlike the previous embodiment, this embodiment provides an air-cooling structure for a gas-liquid composite cooling type electronic window, which constitutes a composite cooling structure in which air cooling and liquid cooling are performed simultaneously.
[0050] Specifically, the air-cooled component 32 also includes an air inlet pipe 321 connected to one side of the end face of the mounting base 2, and the air inlet pipe 321 is connected to the first air inlet channel 322. The air inlet pipe 321 is a set design and is staggered from the water inlet pipe 312 and the water outlet pipe 313 to avoid interference between the air-cooling channel and the liquid-cooling channel.
[0051] Furthermore, the first air intake channel 322 and the second air intake channel 323 are connected. The first air intake channel 322 has a bent design, and the second air intake channel 323 has an inclined design with its bottom facing the center of the electronic window 317. The bent design of the first air intake channel 322 connects the air intake pipe 321 to the second air intake channel 323, so that the airflow entering through the air intake pipe 321 can be blown from the end of the second air intake channel 323 onto the surface of the electronic window 317.
[0052] Preferably, the outer walls of the first air intake channel 322 and the second air intake channel 323 are respectively provided with an outer air nozzle 325 and an inner air nozzle 324, which together form a cooling circuit using the air intake pipe 321, the inner air nozzle 324 and the outer air nozzle 325. The second air intake channel 323 is generally flat-topped and conical in shape, and its internal passage is relatively narrow. The top of the second air intake channel 323 is located on the side away from the electronic window 311, and the bottom of the second air intake channel 323 is located on the side closer to the electronic window 311.
[0053] The rest of the structure is the same as in Example 1.
[0054] During use, while liquid cooling is in progress, the air pump is activated to send airflow through the intake pipe 321. The intake pipe 321 is located on one side of the end face of the mounting base 2. After the airflow is sent through the intake pipe 321, it enters the first intake channel 322. Since the installation height of the intake pipe 321 is lower than the top of the second intake channel 323, the airflow first passes through the first intake channel 322 with a bend design to the highest point before entering the second intake channel 323. The upper and lower sides of the intake channel are respectively equipped with an inner air nozzle 324 and an outer air nozzle 325. The intake pipe 321, the inner air nozzle 324, and the outer air nozzle 325 together form a cooling air path, forming a ring airflow at a certain angle at the air nozzles, which blows onto the surface of the electronic window 317 to cool the window, thereby achieving air cooling. Together with liquid cooling, it achieves a gas-liquid composite cooling structure, and the airflow of the air cooling can be controlled by an external pump source.
[0055] In summary, by utilizing the air-cooling component 32, which does not interfere with the liquid-cooling component 31, the airflow passes through the air intake pipe 321, the first air intake channel 322, and the second air intake channel 323 in sequence to form an annular airflow to cool the electronic window 317. Together with the liquid cooling, they form a dual cooling structure and provide driving force for the adjustment component 4.
[0056] Example 3
[0057] Reference Figure 6 and Figure 7 This is the third embodiment of the present invention. Unlike the previous embodiment, this embodiment provides a method for adjusting the heat exchange space range above the electronic window 317.
[0058] Specifically, the adjustment component 4 also includes an inner cavity 42 formed on the outer wall of the support block 41, through which the sliding block 44 can move inside the support block 41. The sliding block 44 has a two-part design: one part slides inside the support block 41, while the other, wider part, always fits against the inner wall of the electronic window 311. It should be noted that the two ends of the part sliding inside the support block 41 need to be parallel to the movable plate 46. Correspondingly, the design of the inner cavity 42 is adapted to the sliding part of the support block 41 to ensure stable sliding of the support block 41.
[0059] Furthermore, the end face of the slider 44 is in contact with the inner wall of the electronic window 311, and a spring 43 is fixedly installed on the inner wall of the support block 41, with the end of the spring 43 fixedly connected to the end face of the slider 44. The spring 43 connects the support block 41 and the slider 44, and the elastic force of the spring 43 ensures that the slider 44 remains in contact with the inner wall of the electronic window 311 regardless of the position of the support block 41 within its travel range.
[0060] Preferably, a fixed block 45 is fixedly connected to the bottom wall of the support block 41, and a movable plate 46 is rotatably connected to the inner wall of the electronic window 311. The outer wall of the movable plate 46 is rotatably connected to the inner side of the fixed block 45. The fixed block 45 is located on the lower end face of the support block 41, and the two ends of the movable plate 46 are rotatably connected to the support block 41 and the fixed block 45, respectively. The airflow of the air-cooling component 32 blows the support block 41 to move, and the rotation of the movable plate 46 can realize the relative movement between the support block 41 and the sliding block 44, thereby changing the opening range formed by the multiple support blocks 41 and realizing adaptive adjustment of the opening range according to the airflow.
[0061] The rest of the structure is the same as in Example 2.
[0062] In use, when there is no wind blowing on the support block 41, the movable plate 46 is in a horizontal state, and the distance between the support block 41 and the sliding block 44 is at its farthest. At this time, the space formed by the multiple support blocks 41 is the smallest. When air enters the air intake pipe 321, the airflow blows towards the electronic window 317 through the air intake channel. Subsequently, the wind rebounds, giving the support block 41 an upward blowing force. When the support block 41 has an upward tendency, the support block 41 drives the movable plate 46 to rotate. The height of the connection between the movable plate 46 and the electronic window 311 remains unchanged. When the movable plate 46 starts to rotate, the support block 41 not only rises but also moves closer to the electronic window 317. The sliding block 44 moves to one side, gradually reducing the distance between the two. Since the sliding block 44 only moves up and down, during the lifting and lowering of the support block 41, the spring 43 installed on the inner wall of the support block 41 keeps the sliding block 44 moving along the inner wall of the electronic window 311, ensuring that the distance between the two is adjusted stably. As the support block 41 moves synchronously to the side closer to the sliding block 44, the opening channel formed by the support block 41 gradually becomes larger, thereby increasing the exchange rate between the upper part of the electronic window 317 and the outside space, thus quickly carrying away the hot air generated by the electronic window. Conversely, the exchange rate between the hot air and the outside cold air slows down.
[0063] In summary, when the airflow increases, the surface temperature of the electronic window is higher, requiring improved heat dissipation. The opening channel formed by the support block 41 becomes larger, increasing the space for hot and cold air exchange, and the hot air is quickly carried away. When the airflow decreases, the surface temperature of the electronic window is lower than the above, and the heat dissipation speed does not need to be too fast to avoid the surface of the electronic window slat 317 becoming too cold. The opening channel formed by the support block 41 becomes smaller, decreasing the space for hot and cold air exchange, and the hot air is slowly carried away, allowing the adjustment component 4 to adaptively adjust the opening range according to the airflow of the air-cooling component 32.
[0064] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.
Claims
1. A gas-liquid composite cooling type electronic window, characterized in that: include, Mounting flange (1) and mounting seat (2) disposed on the upper end face of said mounting flange (1); and, The cooling assembly (3) includes a liquid cooling component (31) and an air cooling component (32); wherein, The liquid cooling component (31) includes an electronic window (311) disposed on the outside of the mounting flange (1), an electronic window piece (317) integrally formed on the inner wall of the electronic window (311), and a coolant channel (314) opened inside the mounting base (2); and, The air-cooled component (32) further includes a first air intake channel (322) and a second air intake channel (323) formed inside the mounting base (2); and, The adjustment component (4) includes multiple support blocks (41) arranged in a ring on the inner wall of the electronic window (311) and sliding blocks (44) disposed on the inner side of the support blocks (41); wherein, The liquid cooling component (31) and the air cooling component (32) are used to achieve simultaneous liquid cooling and air cooling. The electronic window is cooled by gas-liquid composite cooling, which also increases the electron outflow intensity. The air cooling component (32) is used to provide kinetic energy to the adjustment component (4). In conjunction with the air pressure, the airflow exchange range above the electronic window (317) is adjusted to avoid the surface of the electronic window (317) from being too cold or too hot.
2. The gas-liquid composite cooling type electronic window as described in claim 1, characterized in that: The liquid cooling component (31) also includes an inlet pipe (312) and an outlet pipe (313) disposed on both sides of the end face of the mounting base (2). The inlet pipe (312) and the outlet pipe (313) are both hollow and connected to the coolant channel (314).
3. The gas-liquid composite cooling type electronic window as described in claim 2, characterized in that: The mounting base (2) is provided with a water jacket (315) inside, and a cavity (316) is also provided inside the mounting base (2).
4. The gas-liquid composite cooling type electronic window as described in claim 3, characterized in that: The coolant channel (314) is connected to the cavity (316), and both the coolant channel (314) and the cavity (316) are located below the upper surface of the electronic window (311).
5. The gas-liquid composite cooling type electronic window as described in claim 4, characterized in that: The air-cooling component (32) also includes an air inlet pipe (321) disposed on one side of the end face of the mounting base (2), and the air inlet pipe (321) is connected to the first air inlet channel (322).
6. The gas-liquid composite cooling type electronic window as described in claim 5, characterized in that: The first air intake channel (322) and the second air intake channel (323) are connected. The first air intake channel (322) is a bent design, and the second air intake channel (323) is an inclined design with its bottom facing the center of the electronic window (317).
7. The gas-liquid composite cooling type electronic window as described in claim 6, characterized in that: The outer walls of the first air intake channel (322) and the second air intake channel (323) are respectively provided with an outer air nozzle (325) and an inner air nozzle (324), and the air intake pipe (321), the inner air nozzle (324) and the outer air nozzle (325) together form a cooling circuit.
8. The gas-liquid composite cooling type electronic window as described in claim 7, characterized in that: The adjustment component (4) also includes an inner cavity (42) formed on the outer wall of the support block (41), through which the sliding block (44) can move inside the support block (41).
9. The gas-liquid composite cooling type electronic window as described in claim 8, characterized in that: The end face of the sliding block (44) is in contact with the inner wall of the electronic window (311), and the inner wall of the support block (41) is provided with a spring (43), the end of the spring (43) is provided on the end face of the sliding block (44).
10. The gas-liquid composite cooling type electronic window as described in claim 9, characterized in that: The outer wall of the support block (41) is provided with a fixing block (45), and the inner wall of the electronic window (311) is provided with a movable plate (46), the outer wall of the movable plate (46) is located inside the fixing block (45).