Anti-seismic noise reduction structure of transformer in booster station

Abstract

The utility model provides an anti-seismic noise reduction structure of a transformer in a booster station, which comprises a transformer main body and a support shell, and further comprises a damping structure arranged in the support shell. By rotating a third rotating plate, two clamping plates are driven to be clamped into two first clamping grooves, damping cannot be affected while the transformer is conveniently and well installed and fixed, and by clamping a clamping frame into a second clamping groove, the situation that the third rotating plate rotates, the clamping plates are disengaged from the first clamping grooves, and consequently a transformer body is not firmly fixed is conveniently avoided. Vibration of the transformer body is reduced and buffered through the damping springs and the damping dampers, working noise of the transformer is well reduced due to reduction of the vibration, meanwhile, collision noise can be reduced through the second buffer silencing pad, the third buffer silencing pad and the second buffer silencing pad, the vibration of the transformer can be well reduced, and the service life of the transformer is prolonged. And the noise of the transformer can be well reduced while the transformer can be well damped.

Description

Technical Field

[0001] This utility model relates to the field of secondary equipment technology, and in particular to the anti-vibration and noise reduction structure of transformers in step-up substations. Background Technology

[0002] Secondary equipment refers to auxiliary equipment used for monitoring, controlling, regulating, and protecting primary equipment in a power system. It does not directly participate in the generation and distribution of electrical energy. These devices are typically low-voltage electrical equipment, not directly connected to the main power circuit, but connected to the primary equipment through secondary circuits to achieve monitoring, control, regulation, and protection functions. An example is the transformer in a step-up substation.

[0003] Transformers in substations generate significant vibrations during operation, leading to considerable noise pollution that can cause discomfort to nearby residents. Therefore, effectively mitigating transformer vibration and reducing noise is a crucial issue that needs to be addressed in the seismic and noise reduction structural design of transformers in substations. Utility Model Content

[0004] This invention addresses the problem that large-scale vibration reduction in transformers generates significant noise and causes noise pollution, by providing a vibration-resistant and noise-reducing structure for transformers in step-up substations.

[0005] This utility model solves the above-mentioned technical problems through the following technical solutions:

[0006] This utility model provides a vibration-resistant and noise-reducing structure for transformers in substations, including a transformer body and a supporting shell, and further comprising:

[0007] A shock-absorbing structure is disposed within a supporting housing.

[0008] A snap-fit ​​fixing structure is provided on the shock-absorbing structure;

[0009] A snap-fit ​​limiting structure is provided on a snap-fit ​​fixing structure, and the snap-fit ​​limiting structure fixes and restricts the snap-fit ​​fixing structure.

[0010] Preferably, a mounting bracket is fixedly connected to the bottom side wall of the transformer body, and two mounting plates are fixedly connected to the bottom side wall of the mounting bracket. A snap-fit ​​groove is formed on the side walls of the two mounting plates on opposite sides.

[0011] In this technical solution, during installation, the mounting plate is inserted into the first and second insertion slots, and the mounting plate is snapped onto the first support plate. At this time, the first snap-fit ​​slot on the mounting plate is directly opposite the snap-fit ​​plate.

[0012] Preferably, a second buffer noise-absorbing pad is fixedly connected to the top outer side wall of the support housing, a third buffer noise-absorbing pad is fixedly connected to the top inner side wall of the support housing, and a first buffer noise-absorbing pad is fixedly connected to the bottom inner side wall of the support housing. Two rotating through grooves and a second insertion groove are provided on the side walls of the support housing, the second buffer noise-absorbing pad, and the third buffer noise-absorbing pad. The second insertion groove cooperates with the mounting plate.

[0013] In this technical solution, the second buffer noise reduction pad can reduce the noise from the collision between the support housing and the first support plate, the third buffer noise reduction pad can reduce the noise from the collision between the support housing and the second support plate, and the second buffer noise reduction pad can reduce the noise from the collision between the support housing and the mounting plate.

[0014] Preferably, the shock-absorbing structure includes a first support plate, a first rotating plate, a second rotating plate, a sliding connecting block, a support rod, the second support plate, and a first sliding groove. The support rod is fixedly connected to the inner sidewalls of the two rotating through grooves. The first rotating plate and the second rotating plate are rotatably connected to the support rod. The two ends of the first rotating plate and the second rotating plate are rotatably connected to the sliding connecting block. The first sliding groove is formed on the sidewalls of the first support plate and the second support plate, and the sliding connecting block is slidably connected in the first sliding groove.

[0015] In this technical solution, when the transformer body vibrates, rotating plate one and rotating plate two will rotate under the action of vibration. The rotation of rotating plate one and rotating plate two will drive the sliding connecting block to slide in sliding groove one, and support plate one will move downward.

[0016] Preferably, the first rotating plate and the second rotating plate are arranged in a cross configuration.

[0017] Preferably, shock-absorbing springs are fixedly connected at equal distances between the second support plate and the bottom inner wall of the support housing. The first support plate has two insertion slots, which cooperate with the mounting plate and the mounting bracket.

[0018] Preferably, the support plate one and the buffer sound-absorbing pad two are fixedly connected at equal distances to the shock absorber damper.

[0019] In this technical solution, the damper is compressed, the support plates move upward, and the damping spring is stretched. The damping spring and the damper reduce and buffer the vibration of the transformer body.

[0020] Preferably, the snap-fit ​​fixing structure includes a snap-fit ​​plate, a threaded rod, a rotating gear one, and a sliding groove two. The sliding groove two is provided on the side wall of the support plate one. Two snap-fit ​​plates are slidably connected in the sliding groove two. Threaded rods are threadedly connected to the side walls of the two snap-fit ​​plates. The rotating gear one is fixedly connected to the opposite ends of the two threaded rods. The threads on the threaded rods on the two snap-fit ​​plates are arranged opposite to each other.

[0021] In this technical solution, the rotating gear drives the threaded rod to rotate, and the threaded rod drives the two snap-fit ​​plates to move outward and snap into the two snap-fit ​​slots to fix the mounting plate.

[0022] Preferably, the snap-fit ​​fixing structure includes a second rotating gear, a rotating rod, a third rotating plate, and a second snap-fit ​​groove. One end of the rotating rod is rotatably connected to the inner side wall of the second sliding groove, and the other end of the rotating rod extends out of the side wall of the first support plate and is fixedly connected to the third rotating plate. The side wall of the third rotating plate is provided with snap-fit ​​grooves at equal intervals. Two second rotating gears are fixedly connected to the side wall of the rotating rod, and the second rotating gear and the first rotating gear mesh with each other.

[0023] In this technical solution, rotating plate three drives rotating rod to rotate, rotating rod drives rotating gear two to rotate, and rotating gear two drives rotating gear one to rotate.

[0024] Preferably, the snap-fit ​​limiting structure includes a fixing frame, a snap-fit ​​bracket, a fixing rod, and a spring. The fixing frame is fixedly connected to the front side wall of the support plate one. The fixing frame is located on both sides of the rotating plate three. A fixing rod is fixedly connected between the fixing frames. Two snap-fit ​​brackets are slidably connected to the fixing rod. The side wall of the other end of the snap-fit ​​bracket is slidably connected to the side wall of the fixing frame. The end of the snap-fit ​​bracket and the snap-fit ​​groove two cooperate with each other. A spring is fixedly connected between the snap-fit ​​bracket and the fixing frame.

[0025] In this technical solution, the two snap-fit ​​brackets are pushed outward, causing them to disengage from the snap-fit ​​slot two. The springs are compressed, and the rotation of the rotating plate three is no longer restricted.

[0026] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this utility model.

[0027] The positive and progressive effects of this utility model are as follows:

[0028] 1. By inserting the mounting plate into the first and second insertion slots, the mounting plate is snapped onto the first support plate. The first snap-fit ​​slot on the mounting plate is directly opposite the snap-fit ​​plate. Pushing the two snap-fit ​​brackets outward causes them to disengage from the second snap-fit ​​slot, thus no longer restricting the rotation of the third rotating plate. Rotating the third rotating plate causes the two snap-fit ​​plates to move outward and snap into the two first snap-fit ​​slots, fixing the mounting plate in place. This ensures that the transformer body is fixedly installed on the vibration damping structure, facilitating better installation and fixation of the transformer without affecting the vibration damping.

[0029] 2. The clamping bracket is inserted into the clamping slot two to fix and restrict the rotating plate three, so as to prevent the rotating plate three from rotating and causing the clamping plate to detach from the clamping slot one, which would make the transformer body not securely fixed.

[0030] 3. When the transformer body vibrates, rotating plate one and rotating plate two will rotate under the action of vibration. Support plate one moves downward, and the damping damper is compressed. Support plate two moves upward, and the damping spring is stretched. The damping spring and damping damper reduce and buffer the vibration of the transformer body. The reduction of vibration effectively reduces the noise of the transformer operation. At the same time, buffer sound-absorbing pad two, buffer sound-absorbing pad three and buffer sound-absorbing pad two can reduce the noise of collision, which facilitates the reduction of transformer vibration. It is convenient to effectively reduce transformer noise while effectively damping the transformer. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model.

[0032] Figure 2 This is a schematic diagram of the overall internal structure of this utility model.

[0033] Figure 3 This is a side view of the internal structure of the present invention.

[0034] Figure 4 This is a top view of the internal structure of the present invention.

[0035] Figure 5 The whole of this utility model Figure 2 A magnified schematic diagram of the structure at point A.

[0036] Figure 6 The whole of this utility model Figure 4 Schematic diagram of the enlarged structure at point B

[0037] Explanation of reference numerals in the attached figures

[0038] 1. Transformer body; 2. Mounting frame; 3. Vibration damping structure; 301. Support plate one; 302. Rotating plate one; 303. Rotating plate two; 304. Sliding connecting block; 305. Support rod; 306. Support plate two; 307. Sliding groove one; 311. Vibration damping spring; 4. Buffer noise reduction pad one; 5. Buffer noise reduction pad two; 6. Buffer noise reduction pad three; 7. Vibration damper; 8. Mounting plate; 9. Snap-fit ​​groove one; 10. Insertion groove one; 11. Snap-fit... 1101. Fixed structure; 1102. Threaded rod; 1103. Rotating gear one; 1104. Sliding groove two; 1111. Rotating gear two; 1112. Rotating rod; 1113. Rotating plate three; 1114. Snap-fit ​​groove two; 12. Snap-fit ​​limiting structure; 1201. Fixed frame; 1202. Snap-fit ​​frame; 1203. Fixed rod; 1204. Spring; 13. Support housing; 14. Rotating through groove; 15. Insertion groove two. Detailed Implementation

[0039] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0040] like Figure 1-6 As shown, the anti-vibration and noise reduction structure of the transformer in the substation includes the transformer body 1 and the supporting shell 13, and also includes:

[0041] The shock-absorbing structure 3 is disposed inside the support housing 13;

[0042] A snap-fit ​​fixing structure 11 is provided on the shock-absorbing structure 3;

[0043] A snap-fit ​​limiting structure 12 is provided on the snap-fit ​​fixing structure 11, and the snap-fit ​​limiting structure 12 fixes and restricts the snap-fit ​​fixing structure 11.

[0044] A mounting bracket 2 is fixedly connected to the bottom side wall of the transformer body 1. Two mounting plates 8 are fixedly connected to the bottom side wall of the mounting bracket 2. The two mounting plates 8 have snap-fit ​​grooves 9 on their opposite sides.

[0045] During installation, insert the mounting plate 8 into the first insertion slot 10 and the second insertion slot 15. The mounting plate 8 is then snapped onto the first support plate 301. At this time, the first snap-fit ​​slot 9 on the mounting plate 8 is directly opposite the snap-fit ​​plate 1101.

[0046] A second buffer noise-absorbing pad 5 is fixedly connected to the top outer side wall of the support housing 13, a third buffer noise-absorbing pad 6 is fixedly connected to the top inner side wall of the support housing 13, and a first buffer noise-absorbing pad 4 is fixedly connected to the bottom inner side wall of the support housing 13. Two rotating through grooves 14 and a second insertion groove 15 are opened on the side walls of the support housing 13, the second buffer noise-absorbing pad 5 and the third buffer noise-absorbing pad 6. The second insertion groove 15 and the mounting plate 8 cooperate with each other.

[0047] The second sound-absorbing pad 5 can reduce the noise from the collision between the support housing 13 and the support plate 301, the third sound-absorbing pad 6 can reduce the noise from the collision between the support housing 13 and the support plate 306, and the second sound-absorbing pad 5 can reduce the noise from the collision between the support housing 13 and the mounting plate 8.

[0048] The shock-absorbing structure 3 includes a support plate 301, a rotating plate 302, a rotating plate 303, a sliding connecting block 304, a support rod 305, a support plate 306, and a sliding groove 307. The support rod 305 is fixedly connected to the inner sidewalls of the two rotating through grooves 14. The rotating plate 302 and the rotating plate 303 are rotatably connected to the support rod 305. The two ends of the rotating plate 302 and the rotating plate 303 are rotatably connected to the sliding connecting block 304. The sidewalls of the support plate 301 and the support plate 306 are provided with the sliding groove 307, and the sliding connecting block 304 is slidably connected in the sliding groove 307.

[0049] When the transformer body 1 vibrates, rotating plate 1 302 and rotating plate 2 303 will rotate under the action of vibration. The rotation of rotating plate 1 302 and rotating plate 2 303 will drive the sliding connecting block 304 to slide in sliding groove 1 307, and support plate 1 301 will move downward.

[0050] The rotating plate 302 and the rotating plate 303 are arranged in a cross configuration.

[0051] Shock-absorbing springs 311 are fixedly connected at equal distances between the second support plate 306 and the bottom inner wall of the support housing 13. The first support plate 301 has two insertion slots 10. The insertion slots 10 and the mounting plate 8 cooperate with each other. The first support plate 301 and the mounting bracket 2 cooperate with each other.

[0052] The shock absorber 7 is fixedly connected at equal distances between the support plate 301 and the buffer sound-absorbing pad 5.

[0053] The damper 7 is compressed, the support plate 306 moves upward, and the damping spring 311 is stretched. The damping spring 311 and the damper 7 reduce and buffer the vibration of the transformer body 1.

[0054] The snap-fit ​​fixing structure 11 includes a snap-fit ​​plate 1101, a threaded rod 1102, a rotating gear 1103, and a sliding groove 1104. The sliding groove 1104 is provided on the side wall of the support plate 301. Two snap-fit ​​plates 1101 are slidably connected in the sliding groove 1104. Threaded rods 1102 are threadedly connected to the side walls of the two snap-fit ​​plates 1101. The rotating gear 1103 is fixedly connected to the opposite ends of the two threaded rods 1102. The threads on the threaded rods 1102 on the two snap-fit ​​plates 1101 are arranged opposite to each other.

[0055] Rotating gear 1103 drives threaded rod 1102 to rotate, and threaded rod 1102 drives two snap-fit ​​plates 1101 to move outward and snap into two snap-fit ​​grooves 9 to fix the mounting plate 8.

[0056] The snap-fit ​​fixing structure 11 includes a second rotating gear 1111, a rotating rod 1112, a third rotating plate 1113, and a second snap-fit ​​groove 1114. One end of the rotating rod 1112 is rotatably connected to the inner side wall of the second sliding groove 1104, and the other end of the rotating rod 1112 extends out of the side wall of the first support plate 301 and is fixedly connected to the third rotating plate 1113. The second snap-fit ​​groove 1114 is provided at equal intervals on the side wall of the third rotating plate 1113. Two rotating gears 1111 are fixedly connected to the side wall of the rotating rod 1112, and the second rotating gear 1111 and the first rotating gear 1103 mesh with each other.

[0057] Rotate rotating plate 3 1113, which drives rotating rod 1112 to rotate, rotating rod 1112 drives rotating gear 2 1111 to rotate, and rotating gear 2 1111 drives rotating gear 1 1103 to rotate.

[0058] The snap-fit ​​limiting structure 12 includes a fixing frame 1201, a snap-fit ​​bracket 1202, a fixing rod 1203, and a spring 1204. The fixing frame 1201 is fixedly connected to the front side wall of the support plate 301. The fixing frame 1201 is located on both sides of the rotating plate 3113. The fixing rod 1203 is fixedly connected between the fixing frames 1201. Two snap-fit ​​brackets 1202 are slidably connected to the fixing rod 1203. The side wall of the other end of the snap-fit ​​bracket 1202 is slidably connected to the side wall of the fixing frame 1201. The end of the snap-fit ​​bracket 1202 and the snap-fit ​​groove 2114 cooperate with each other. The spring 1204 is fixedly connected between the snap-fit ​​bracket 1202 and the fixing frame 1201.

[0059] Push the two snap-fit ​​brackets 1202 outward so that the snap-fit ​​brackets 1202 disengage from the snap-fit ​​groove 1114, and the spring 1204 is compressed, no longer restricting the rotation of the rotating plate 1113.

[0060] In use, all electrical components described in this application are externally connected to a power supply and control switch. During installation, the mounting plate 8 is inserted into the first insertion slot 10 and the second insertion slot 15. The mounting plate 8 is then snapped onto the support plate 301. At this time, the first snap-fit ​​slot 9 on the mounting plate 8 is directly opposite the snap-fit ​​plate 1101. Pushing the two snap-fit ​​brackets 1202 outward causes them to disengage from the second snap-fit ​​slot 1114, thus no longer restricting the rotation of the rotating plate 3113. The rotating plate 1113 drives the rotating rod 1112 to rotate, which in turn drives the rotating gear 1111 to rotate. The rotating gear 1111 drives the rotating gear 1103 to rotate, which in turn drives the threaded rod 1102 to rotate. The threaded rod 1102 drives the two snap-fit ​​plates 1101 to move outward and snap into the two snap-fit ​​slots 9, thus fixing the mounting plate 8. This allows the transformer body 1 to be fixedly mounted on the shock-absorbing structure 3.

[0061] Then release the snap-fit ​​bracket 1202, and the spring 1204 unfolds and pushes the snap-fit ​​bracket 1202 to snap back into the snap-fit ​​groove 1114, which fixes and restricts the rotating plate 1113 to prevent the rotating plate 1113 from rotating and causing the snap-fit ​​plate 1101 to fall out of the snap-fit ​​groove 9, so that the transformer body 1 is not firmly fixed.

[0062] When the transformer body 1 vibrates, rotating plate 1 302 and rotating plate 2 303 will rotate under the action of vibration. The rotation of rotating plate 1 302 and rotating plate 2 303 will drive the sliding connecting block 304 to slide in sliding groove 1 307. Support plate 1 301 moves downward, the damping damper 7 is compressed, and support plate 2 306 moves upward, the damping spring 311 is stretched. The damping spring 311 and the damping damper 7 reduce and buffer the vibration of the transformer body 1. The second buffer sound-absorbing pad 5 can reduce the noise of the collision between the support shell 13 and the support plate 1 301. The third buffer sound-absorbing pad 6 can reduce the noise of the collision between the support shell 13 and the support plate 2 306. The second buffer sound-absorbing pad 5 can reduce the noise of the collision between the support shell 13 and the mounting plate 8, thereby effectively reducing the vibration of the transformer and thus reducing the noise of the transformer operation.

[0063] This utility model is not limited to the above-described embodiments. Any changes in its shape or structure fall within the protection scope of this utility model. The protection scope of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the protection scope of this utility model.

Claims

1. A seismic and noise-reducing structure for a transformer in a substation, comprising a transformer body (1) and a supporting shell (13), characterized in that, Also includes: The shock-absorbing structure (3) is disposed inside the supporting shell (13); A snap-fit ​​fixing structure (11) is provided on the shock-absorbing structure (3); A snap-fit ​​limiting structure (12) is provided on a snap-fit ​​fixing structure (11) to fix and limit the snap-fit ​​fixing structure (11).

2. The anti-vibration and noise reduction structure for transformers in a substation as described in claim 1, characterized in that: A mounting bracket (2) is fixedly connected to the bottom side wall of the transformer body (1), and two mounting plates (8) are fixedly connected to the bottom side wall of the mounting bracket (2). A snap-fit ​​groove (9) is opened on the side wall of the two mounting plates (8) on opposite sides.

3. The anti-vibration and noise reduction structure for transformers in a substation as described in claim 1, characterized in that: A second buffer noise-absorbing pad (5) is fixedly connected to the top outer side wall of the support housing (13), a third buffer noise-absorbing pad (6) is fixedly connected to the top inner side wall of the support housing (13), and a first buffer noise-absorbing pad (4) is fixedly connected to the bottom inner side wall of the support housing (13). Two rotating through slots (14) and a second insertion slot (15) are opened on the side walls of the support housing (13), the second buffer noise-absorbing pad (5) and the third buffer noise-absorbing pad (6). The second insertion slot (15) and the mounting plate (8) cooperate with each other.

4. The anti-vibration and noise reduction structure for transformers in a substation as described in claim 1, characterized in that: The shock-absorbing structure (3) includes a support plate (301), a rotating plate (302), a rotating plate (303), a sliding connecting block (304), a support rod (305), a support plate (306), and a sliding groove (307). The support rod (305) is fixedly connected to the inner sidewalls of two rotating through grooves (14). The rotating plate (302) and the rotating plate (303) are rotatably connected to the support rod (305). The two ends of the rotating plate (302) and the rotating plate (303) are rotatably connected to the sliding connecting block (304). The sidewalls of the support plate (301) and the support plate (306) are provided with the sliding groove (307). The sliding connecting block (304) is slidably connected in the sliding groove (307).

5. The anti-vibration and noise reduction structure for transformers in a step-up substation as described in claim 4, characterized in that: The rotating plate one (302) and rotating plate two (303) are arranged in a cross configuration.

6. The anti-vibration and noise reduction structure for transformers in a step-up substation as described in claim 4, characterized in that: Shock-absorbing springs (311) are fixedly connected at equal distances between the bottom inner wall of the second support plate (306) and the support shell (13). The first support plate (301) has two insertion slots (10). The insertion slots (10) and the mounting plate (8) cooperate with each other. The first support plate (301) and the mounting bracket (2) cooperate with each other.

7. The anti-vibration and noise reduction structure for transformers in a substation as described in claim 4, characterized in that: The shock absorber (7) is fixedly connected at equal distances between the support plate 1 (301) and the buffer sound-absorbing pad 2 (5).

8. The anti-vibration and noise reduction structure for transformers in a step-up substation as described in claim 1, characterized in that: The snap-fit ​​fixing structure (11) includes a snap-fit ​​plate (1101), a threaded rod (1102), a rotating gear (1103), and a sliding groove (1104). The sliding groove (1104) has a side wall on which a support plate (301) is located. Two snap-fit ​​plates (1101) are slidably connected in the sliding groove (1104). Threaded rods (1102) are threadedly connected to the side walls of the two snap-fit ​​plates (1101). Rotating gear (1103) is fixedly connected to the opposite ends of the two threaded rods (1102). The threads on the threaded rods (1102) on the two snap-fit ​​plates (1101) are arranged opposite to each other.

9. The anti-vibration and noise reduction structure for transformers in a substation as described in claim 1, characterized in that: The snap-fit ​​fixing structure (11) includes a second rotating gear (1111), a rotating rod (1112), a third rotating plate (1113), and a second snap-fit ​​groove (1114). One end of the rotating rod (1112) is rotatably connected to the inner side wall of the second sliding groove (1104), and the other end of the rotating rod (1112) extends out of the side wall of the first support plate (301) and is fixedly connected to the third rotating plate (1113). The second snap-fit ​​groove (1114) is provided at equal intervals on the side wall of the third rotating plate (1113). Two second rotating gears (1111) are fixedly connected to the side wall of the rotating rod (1112), and the second rotating gear (1111) and the first rotating gear (1103) mesh with each other.

10. The anti-vibration and noise reduction structure for transformers in a step-up substation as described in claim 9, characterized in that: The snap-fit ​​limiting structure (12) includes a fixed frame (1201), a snap-fit ​​frame (1202), a fixed rod (1203), and a spring (1204). The fixed frame (1201) is fixedly connected to the front side wall of the support plate (301). The fixed frame (1201) is located on both sides of the rotating plate (1113). The fixed rod (1203) is fixedly connected between the fixed frames (1201). Two snap-fit ​​frames (1202) are slidably connected on the fixed rod (1203). The side wall of the other end of the snap-fit ​​frame (1202) is slidably connected to the side wall of the fixed frame (1201). The end of the snap-fit ​​frame (1202) and the snap-fit ​​groove (1114) cooperate with each other. The spring (1204) is fixedly connected between the snap-fit ​​frame (1202) and the fixed frame (1201).

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