Transformer for electric power capital construction

Abstract

The invention relates to the technical field of power infrastructure transformers, in particular to a power infrastructure transformer which comprises an outer cabinet set, a first iron core frame, a second iron core frame, a bottom frame, an adjusting frame, a coil set and a fixing frame, a framework mechanism is arranged between the lower side of the coil set and the upper side of the adjusting frame, and an auxiliary mechanism is arranged on the inner side of the framework mechanism. The framework mechanism comprises a mounting plate, a supporting rod is arranged on the lower side of the mounting plate, a linkage gear is arranged on the side face of the supporting rod, and an adjusting plate is arranged in the mounting plate. By arranging the framework mechanism and the auxiliary mechanism, on the premise of ensuring that the transformer is free of leakage pollution, temperature reduction during high-voltage use of the transformer can be met, auxiliary liquid cooling is conducted through cooling liquid, the transformer can work at the stable temperature, the working efficiency is ensured, and the service life of the transformer is prolonged. In addition, fire extinguishing operation can be carried out through the cooling liquid when the transformer is on fire, and the safety of the transformer is further guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of power infrastructure transformers, and particularly to a transformer for power infrastructure. Background Art

[0002] Intelligent large transformers are power equipment integrating advanced intelligent technologies, playing a key role in power infrastructure, performing voltage transformation and supply operations to meet power supply requirements in various places, including dry-type transformers, oil-immersed transformers, etc.

[0003] Existing transformers still have the following disadvantages: Dry-type transformers are cooled by air cooling, and it is difficult to stably cool the transformers during continuous high-efficiency operation; oil-immersed transformers have the problem of liquid leakage polluting the environment; in addition, existing transformers support and fix the coils through a skeleton, and the existing skeleton is generally of a fixed structure. When it is necessary to replace coils of different specifications, the skeleton needs to be removed and replaced, which is inconvenient to use. Therefore, we propose a transformer for power infrastructure. Summary of the Invention

[0004] In order to overcome the technical problems existing in the above-mentioned prior art, the present invention provides a transformer for power infrastructure.

[0005] To solve the above technical problems, the present invention provides the following technical solutions: It includes an outer cabinet group, a first iron core frame, a second iron core frame, a bottom frame, an adjustment frame, a coil group, and a fixing frame. A skeleton mechanism is arranged at the middle position between the lower side of the coil group and the upper side of the adjustment frame, and an auxiliary mechanism is arranged inside the skeleton mechanism.

[0006] The skeleton mechanism includes a mounting plate. A support rod is arranged on the lower side of the mounting plate, a linkage gear is arranged on the side of the support rod, an adjustment plate is arranged inside the mounting plate, a restraint rod is arranged on the side of the adjustment plate, and a sliding rod is arranged on the upper side of the restraint rod.

[0007] The auxiliary mechanism includes an opening cavity. An activity block and three elastic plates are arranged inside the opening cavity. A diversion groove is formed on the side of the activity block and the diversion groove penetrates through the activity block, the adjustment plate, and the sliding rod. A pressure relief valve is arranged on the side of the activity block, and a first diversion ring and a second diversion ring are respectively arranged inside the mounting plate.

[0008] Furthermore, a transformer group is arranged inside the outer cabinet group. The transformer group includes a first iron core frame arranged inside the outer cabinet group, a second iron core frame is snap-fitted and installed on the upper side of the first iron core frame, a bottom frame is fixedly installed on the lower side of the first iron core frame and is fixedly installed on the bottom side inside the outer cabinet group, an adjustment frame is arranged on the upper side of the bottom frame and is arranged on both sides of the first iron core frame, the coil group is movably sleeved on the side of the first iron core frame and is arranged on the upper side of the adjustment frame, and a fixing frame is arranged on the upper side of the coil group and is arranged on both sides of the second iron core frame.

[0009] Further, the mounting plate is arranged between the coil group and the adjusting frame. The support rods are staggered and arranged on the lower side of the mounting plate. An inner cavity is formed at a position close to the upper part inside the mounting plate. The adjusting plate is movably installed inside the inner cavity. A constraint groove is formed on the side surface of the adjusting plate, and the constraint rod is movably installed inside the constraint groove.

[0010] Further, a sliding groove is formed on the top wall of the inner cavity. The sliding rod is movably installed inside the sliding groove. The linkage gear is meshed and arranged on the side surface of the support rod, and the linkage gear is rotatably installed at the position of the top wall of the inner cavity.

[0011] Further, the mounting plate is movably sleeved on the side surface of the first iron core frame. The support rods are fixedly installed on the upper side of the adjusting frame through bolts. The sliding rod is fixedly installed at the upper side position of the inner cavity. The linkage gear penetrates through the mounting plate to the inside of the inner cavity and meshes with the adjusting plate.

[0012] Further, an opening cavity is formed on the bottom wall of the inner cavity. The movable block is movably installed inside the opening cavity. Both sides of the movable block are attached to the wall surface of the opening cavity. Three elastic plates are fixedly installed between the side surface of the movable block and the wall surface of the opening cavity.

[0013] Further, the first flow guiding ring and the second flow guiding ring are respectively fixedly connected to the inside of the opening cavity through round tubes. An opening hole is formed on the wall surface of the opening cavity, and the pressure relief valve is arranged on the wall surface of the flow guiding groove.

[0014] Further, the opening cavity corresponds to the sliding groove position. The movable block is fixedly installed at the lower side position of the constraint rod. Both sides of the elastic plate are attached to the wall surface of the opening cavity. The pressure relief valve penetrates and is fixed on the side surface of the movable block.

[0015] Compared with the prior art, the beneficial effects that the present invention can achieve are as follows:

[0016] 1. By setting the skeleton mechanism and the auxiliary mechanism, the present invention can meet the temperature reduction of the transformer during high-voltage use on the premise of ensuring no leakage and pollution of the transformer. The coolant is used for auxiliary liquid cooling to enable the transformer to work at a stable temperature, ensuring the working efficiency. In addition, the coolant can be used for fire extinguishing when the transformer catches fire, further ensuring the safety of the transformer.

[0017] 2. By setting the skeleton mechanism, the sliding rod for supporting the coil group can be adjusted, supported and fixed adaptively, so as to meet the support use of coil groups of different specifications. It is not necessary to replace the skeleton to change transformers of different specifications, and the supporting sliding rod can cooperate with the coil group for heat dissipation and temperature reduction operations.

[0018] 3. By providing an auxiliary mechanism, the present invention can cool the coil group through liquid cooling, ensuring the high efficiency of heat dissipation of the coil group. Moreover, by using coolant, it avoids the disadvantages of insulation oil leakage polluting the environment and excessive fire risk.

[0019] 4. By providing a support rod and a linkage gear, the support rod can support the mounting plate, enabling the mounting plate to support the coil group. The support rod is fixed to the side of the adjustment frame and can be driven by it to engage with the linkage gear. Through the linkage gear, the adjustment plate can be engaged and driven to rotate, for driving the position adjustment of the sliding rod, making the position adjustment of the sliding rod more convenient.

[0020] 5. By providing a first diversion ring and a second diversion ring, the first diversion ring and the second diversion ring can conduct centralized liquid supply and liquid return operations for the coolant. In this way, the coolant is respectively guided to the diversion grooves to drive the heat on the side of the sliding rod. And since the first diversion ring and the second diversion ring are arranged inside the mounting plate, the blower of the outer cabinet group can be used to cool the coolant, making multi-functional use of the blower and reducing the equipment setting cost.

[0021] 6. By providing a pressure relief valve and an opening, in case of a fire, the pressure relief valve can be opened and connected through increased water pressure, enabling the coolant to flow into the open cavity and be discharged from the sliding groove. Additionally, the provided opening can also discharge the coolant. The coolant can be used to spray water on the transformer for fire extinguishing operations, ensuring the safety of transformer use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is the overall structural schematic diagram of the present invention;

[0023] Figure 2 is the partial schematic diagram of the transformer group of the present invention;

[0024] Figure 3 is the partial peripheral structural schematic diagram of the first iron core frame of the present invention;

[0025] Figure 4 is the partial schematic diagram of the present invention;

[0026] Figure 5 is the cross-sectional structural schematic diagram of the inner cavity of the present invention;

[0027] Figure 6 is the present invention Figure 5 is the enlarged structural schematic diagram at A of the present invention;

[0028] Figure 7 is the partial structural schematic diagram of the adjustment plate of the present invention;

[0029] Figure 8 is the partial structural schematic diagram of the auxiliary mechanism of the present invention.

[0030] Wherein: 1. Outer cabinet group; 2. First iron core frame; 21. Second iron core frame; 22. Base frame; 23. Adjusting frame; 24. Coil group; 25. Fixing frame; 3. Skeleton mechanism; 31. Mounting plate; 32. Support rod; 33. Inner cavity; 331. Adjusting plate; 332. Constraint groove; 333. Constraint rod; 34. Slide groove; 341. Slide bar; 35. Linkage gear; 4. Auxiliary mechanism; 41. Opening cavity; 411. Opening hole; 42. Movable block; 43. Flow guiding groove; 431. Pressure relief valve; 44. Elastic plate; 45. First flow guiding ring; 46. Second flow guiding ring. Detailed implementation manners

[0031] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments. However, the following embodiments are only the preferred embodiments of the present invention and not all of them. Based on the embodiments in the implementation manners, other embodiments obtained by those skilled in the art without creative efforts all fall within the protection scope of the present invention. The experimental methods in the following embodiments are all conventional methods unless otherwise specified, and the materials, reagents, etc. used in the following embodiments can all be obtained from commercial channels unless otherwise specified.

[0032] Embodiment: As Figure 1 and Figure 2As shown in the figure, a transformer for electric power infrastructure construction includes an outer cabinet group 1. The outer cabinet group 1 is an integrated electric control cabinet with a controller, and a heat dissipation fan, a water pump, a liquid supply tank, etc. are arranged inside it, which can be used for subsequent multi-state heat dissipation operations. A transformer group is arranged inside the outer cabinet group 1. The transformer group includes a first iron core frame 2 arranged inside the outer cabinet group 1. The first iron core frame 2 is an "E"-shaped frame. A second iron core frame 21 is clamped and installed on the upper side of the first iron core frame 2. The second iron core frame 21 is a rectangular frame. The first iron core frame 2 and the second iron core frame 21 are made of silicon steel sheets and are stepped to form a cylindrical cross-section. Bottom frames 22 are symmetrically and fixedly installed on the lower side of the first iron core frame 2, and the bottom frames 22 are fixedly installed on the bottom side inside the outer cabinet group 1. Corresponding to the position of the heat dissipation fan, the bottom frames 22 are "J"-shaped frames. Adjusting frames 23 are mirror-symmetrically arranged on the upper side of the bottom frames 22 and the adjusting frames 23 are arranged on both sides of the first iron core frame 2. The adjusting frames 23 are "C"-shaped frames. The adjusting frames 23 can be adjusted in position and locked on the side of the bottom frames 22 through bolts. A coil group 24 is movably sleeved on the side of the first iron core frame 2, and the coil group 24 is arranged above the adjusting frames 23. The adjusting frames 23 are electromagnetic coil groups 24 and are electrically connected through conductive aluminum plates. A fixing frame 25 is arranged above the coil group 24 and the fixing frame 25 is arranged on both sides of the second iron core frame 21. The fixing frame 25 is fixed above the coil group 24 through bolts. The fixing frame 25 is an "L"-shaped frame. A skeleton mechanism 3 for supporting the coil group 24 is arranged at the middle position between the lower side of the coil group 24 and the upper side of the adjusting frames 23. An auxiliary mechanism 4 for assisting in heat dissipation is arranged inside the skeleton mechanism 3;

[0033] The provided skeleton mechanism 3 can adapt and fix coil groups 24 of different specifications, and the adjustment method is simple. Adjustment can be completed without disassembling a variety of components;

[0034] Such as Figures 3 to 8As shown, the skeleton mechanism 3 includes a mounting plate 31 disposed between the coil group 24 and the adjusting frame 23, and the mounting plate 31 is movably sleeved on the side position of the first iron core frame 2. The mounting plate 31 is an annular plate with a rectangular groove opened on the lower side. Support rods 32 are arranged in a mirror-image staggered manner on the lower side of the mounting plate 31, and the support rods 32 are fixedly installed on the upper side position of the adjusting frame 23 through bolts. The support rods 32 are rectangular rods with serrated sides. An inner cavity 33 is opened at a position near the upper part inside the mounting plate 31. The inner cavity 33 is an annular cavity. An adjusting plate 331 is movably installed inside the inner cavity 33. The adjusting plate 331 is an annular toothed plate. Constraint grooves 332 penetrating through it are equidistantly opened on the side of the adjusting plate 331. The constraint grooves 332 are arc-shaped grooves. Constraint rods 333 are movably installed inside the constraint grooves 332. The constraint rods 333 are cylindrical blocks. Through grooves 34 penetrating through it are equidistantly opened on the top wall of the inner cavity 33 corresponding to the constraint grooves 332. The through grooves 34 are rectangular grooves. Slide rods 341 are movably installed inside the through grooves 34, and the slide rods 341 are fixedly installed on the upper side position of the inner cavity 33. The slide rods 341 are attached to the inner side of the coil group 24. The slide rods 341 are convex-shaped rods made of a heat-conductive material with an arc-shaped side. A linkage gear 35 is meshed on the side of the support rod 32, and the linkage gear 35 penetrates through the mounting plate 31 into the inner cavity 33 and meshes with the adjusting plate 331. The linkage gear 35 is rotatably installed at the top wall of the inner cavity 33 and can be rotationally constrained and meshed with the adjusting plate 331 and the support rod 32 for driving; specifically, when the bolts on the side of the adjusting frame 23 are loosened and the adjusting frame 23 is pushed to slide on the side of the chassis 22, the support rod 32 can be driven to engage with the linkage gear 35. The adjusting plate 331 is driven to rotate through the transmission and engagement of the linkage gear 35. At this time, the constraint rod 333 is constrained inside the constraint groove 332, and the position is adjusted by cooperating with the constrained sliding of the slide rod 341 inside the through groove 34. Subsequently, the bolts are tightened to fix the adjusting frame 23 on the side of the chassis 22, and the position of the slide rod 341 on the upper side of the mounting plate 31 can be adjusted to adapt to the installation of coil groups 24 of different specifications;

[0035] Through the provided auxiliary mechanism 4, the heat dissipation operation of the coil group 24 can be assisted, and fire extinguishing operation can be carried out in case of emergency to ensure the safety of the transformer operation;

[0036] Such as Figures 3 to 8As shown in the figure, the auxiliary mechanism 4 includes an opening cavity 41 equidistantly opened on the bottom wall of the inner cavity 33, and the opening cavity 41 corresponds to the position of the sliding groove 34. The opening cavity 41 is a convex-shaped cavity. An active block 42 is movably installed inside the opening cavity 41, and the active block 42 is fixedly installed at the lower side position of the constraint rod 333. Both sides of the active block 42 are attached to the wall surface of the opening cavity 41. The active block 42 is a convex-shaped block made of wear-resistant rubber. A diversion groove 43 is opened on the side surface of the active block 42, and the diversion groove 43 penetrates through the active block 42, the adjusting plate 331 and the sliding rod 341. The diversion groove 43 is a cylindrical groove with a "U"-shaped path. Three groups of elastic plates 44 are equidistantly and fixedly installed between the side surface of the active block 42 and the wall surface of the opening cavity 41, and both sides of the elastic plates 44 are attached to the wall surface of the opening cavity 41. The positions of the elastic plates 44 correspond to the water inlet and outlet of the diversion groove 43 for isolation operation. The opening cavity 41 is a rectangular plate made of wear-resistant rubber with a continuously "W"-shaped cross-section. A first diversion ring 45 and a second diversion ring 46 are respectively arranged on the inner side of the mounting plate 31 corresponding to the water inlet and outlet of the diversion groove 43, and the first diversion ring 45 and the second diversion ring 46 are respectively fixedly connected to the inside of the opening cavity 41 through round tubes. The first diversion ring 45 and the second diversion ring 46 are hollow rings inside. The first diversion ring 45 and the second diversion ring 46 are respectively connected to the water outlet of the water pump inside the outer cabinet group 1 and the water inlet of the liquid supply tank through pipes. Circular holes 411 penetrating the mounting plate 31 are equidistantly opened on the wall surface of the opening cavity 41 far from the first iron core frame 2. The circular holes 411 are circular holes. A pressure relief valve 431 is arranged on the wall surface of the diversion groove 43, and the pressure relief valve 431 is fixedly penetrated on the side surface of the active block 42. The pressure relief valve 431 is a valve that can be connected when the pressure reaches a certain value. Specifically, when the sliding rod 341 adjusts its position, the constraint rod 333 will drive the active block 42 to slide inside the opening cavity 41 accordingly. The active block 42 pulls the elastic plate 44 to deform accordingly. The internal space of the opening cavity 41 is isolated by the active block 42 and the elastic plate 44. The external water pump supplies water to the first diversion ring 45 through a pipe, and then the water is conveyed from the first diversion ring 45 to the inside of the opening cavity 41 and enters the diversion groove 43. The sliding rod 341 is cooled through the diversion groove 43. After circulating inside the sliding rod 341, the constraint rod 333 and the active block 42, it is discharged from the other end of the diversion groove 43 and gathered inside the second diversion ring 46, and flows back to the liquid supply tank through a pipe. The heat dissipation operation of the inside of the coil group 24 is assisted through the sliding rod 341. In addition, when the water pump water pressure increases to a certain value, the pressure relief valve 431 is opened under pressure, and the water flows into the opening cavity 41 to be filled, and then can be discharged from the circular holes 411 and the sliding groove 34 for fire extinguishing operation.

[0037] Working principle:

[0038] During normal use: The transformer bank is placed at the internal position of the outer cabinet group 1 and dissipates heat through the internal fan of the outer cabinet group 1. The air flow blows downward from the bottom side of the chassis 22, and is guided by the mounting plate 31 to concentrate the air flow to the inner side position of the coil group 24 for air-cooled heat dissipation. The remaining air flow passes through the outside of the coil group 24, so that the heat dissipation operation during normal use can be satisfied.

[0039] When the temperature is too high: At this time, the internal fan of the outer cabinet group 1 cannot meet the heat dissipation operation of the coil group 24. The water pump works to pump the coolant in the liquid supply tank into the first guide ring 45, and then flows through the first guide ring 45 into each cavity 41. Constrained and isolated by the movable block 42 and the elastic plate 44, the coolant flows through the inside of the slide bar 341, the restraint bar 333 and the movable block 42 from the inside of the flow guide groove 43, and finally converges into the second guide ring 46 and is discharged back to the liquid supply tank. The heat in the coil group 24 is absorbed through the slide bar 341, and the coolant takes away the heat, further cooling the coil group 24 to meet the normal use of the transformer.

[0040] In addition, the internal fan of the outer cabinet group 1 works at the same time. When the air flow passes through the inside of the mounting plate 31, it can also cool the first guide ring 45 and the second guide ring 46, completing the air-cooling of the coolant. It can meet the use without adding subsequent cooling modules, reducing the setting cost.

[0041] When replacing the electromagnetic coil: Open the external movable door of the outer cabinet group 1. First, remove the fixing frame 25 with tools, then unplug the second iron core frame 21 to separate it from the first iron core frame 2. After disassembling the external connection wire of the coil group 24, directly pull out the coil group 24 to the side position of the slide bar 341. Then loosen the bolt connecting the adjusting frame 23 and the chassis 22, and pull the adjusting frame 23 to slide on the side of the chassis 22. The adjusting frame 23 can drive the support rod 32 to move synchronously. The support rod 32 meshes with the linkage gear 35 to drive the adjusting plate 331 to rotate synchronously, so as to constrain the slide bar 341 to adjust the position, meet the inner support and fixation operation of the coil group 24 of different specifications, and then tighten the bolt to fix the adjusting frame 23 to complete the position fixation of the slide bar 341. This is convenient for the replacement and modification of the transformer coil group 24, and is easy to use.

[0042] In case of fire: When a fire is detected by the internal sensor of the outer cabinet group 1, the controller controls the water pump to supply high-pressure water. After the water flow pressure becomes larger, the pressure relief valve 431 is pressure-relieved and connected. The coolant is discharged from the pressure relief valve 431 into the cavity 41, and the coolant is discharged from the opening 411 and the chute 34, completing the water spraying fire extinguishing operation on the side of the transformer to ensure the safe use of the transformer.

[0043] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited thereto, and various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those skilled in the relevant art.

Claims

1. A transformer for electric power infrastructure construction, comprising an outer cabinet group (1), a first iron core frame (2), a second iron core frame (21), a bottom frame (22), an adjustment frame (23), a coil group (24) and a fixing frame (25). There is a skeleton mechanism (3) provided at the middle position between the lower side of the coil group (24) and the upper side of the adjustment frame (23), and an auxiliary mechanism (4) is provided inside the skeleton mechanism (3). It is characterized in that: The skeleton mechanism (3) includes a mounting plate (31). A support rod (32) is provided on the lower side of the mounting plate (31). A linkage gear (35) is provided on the side of the support rod (32). An adjustment plate (331) is provided inside the mounting plate (31). A restraint rod (333) is provided on the side of the adjustment plate (331). A sliding rod (341) is provided on the upper side of the restraint rod (333). The auxiliary mechanism (4) includes a cavity (41). An active block (42) and three elastic plates (44) are provided inside the cavity (41). A diversion groove (43) is provided on the side of the active block (42) and the diversion groove (43) penetrates through the active block (42), the adjustment plate (331) and the sliding rod (341). A pressure relief valve (431) is provided on the side of the active block (42). A first diversion ring (45) and a second diversion ring (46) are respectively provided on the inner side of the mounting plate (31).

2. The transformer for electric power infrastructure according to claim 1, characterized in that: A transformer group is provided inside the outer cabinet group (1). The transformer group includes the first iron core frame (2) provided inside the outer cabinet group (1). The second iron core frame (21) is snap-fitted and installed on the upper side of the first iron core frame (2). The bottom frame (22) is fixedly installed on the lower side of the first iron core frame (2) and is fixedly installed on the inner bottom side of the outer cabinet group (1). The adjustment frame (23) is provided on the upper side of the bottom frame (22) and is provided on both sides of the first iron core frame (2). The coil group (24) is movably sleeved on the side of the first iron core frame (2) and is provided on the upper side of the adjustment frame (23). The fixing frame (25) is provided on the upper side of the coil group (24) and is provided on both sides of the second iron core frame (21).

3. The transformer for power infrastructure according to claim 2, characterized in that: The mounting plate (31) is provided between the coil group (24) and the adjustment frame (23). The support rods (32) are staggeredly arranged on the lower side of the mounting plate (31). An inner cavity (33) is provided at the upper position inside the mounting plate (31). The adjustment plate (331) is movably installed inside the inner cavity (33). A restraint groove (332) is provided on the side of the adjustment plate (331). The restraint rod (333) is movably installed inside the restraint groove (332).

4. A transformer for power infrastructure according to claim 3, characterized in that: A sliding groove (34) is provided on the top wall of the inner cavity (33). The sliding rod (341) is movably installed inside the sliding groove (34). The linkage gear (35) is meshed and provided on the side of the support rod (32). The linkage gear (35) is rotatably installed at the position of the top wall of the inner cavity (33).

5. A transformer for electric power infrastructure according to claim 4, characterized in that: The installation plate (31) is movably sleeved on the side of the first iron core frame (2). The support rod (32) is fixedly installed on the upper side of the adjustment frame (23) through bolts. The sliding rod (341) is fixedly installed on the upper side of the inner cavity (33). The linkage gear (35) penetrates through the installation plate (31) into the inner cavity (33) and meshes with the adjustment plate (331).

6. A transformer for electric power infrastructure according to claim 5, characterized in that: The cavity (41) is opened on the bottom wall of the inner cavity (33). The movable block (42) is movably installed inside the cavity (41). Both sides of the movable block (42) are attached to the wall surface of the cavity (41). Three elastic plates (44) are fixedly installed between the side surface of the movable block (42) and the wall surface of the cavity (41).

7. A transformer for power infrastructure according to claim 6, characterized in that: The first flow guiding ring (45) and the second flow guiding ring (46) are respectively fixedly connected to the inside of the cavity (41) through round tubes. The wall surface of the cavity (41) is provided with an opening (411). The pressure relief valve (431) is arranged on the wall surface of the flow guiding groove (43).

8. A transformer for power infrastructure according to claim 7, characterized in that: The cavity (41) corresponds to the position of the sliding groove (34). The movable block (42) is fixedly installed on the lower side of the restraining rod (333). Both sides of the elastic plate (44) are attached to the wall surface of the cavity (41). The pressure relief valve (431) penetrates and is fixed on the side surface of the movable block (42).

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