Safe and energy-saving isolation transformer for alternating-current frequency converter

Abstract

The invention relates to the technical field of isolation transformers, and discloses a safe and energy-saving isolation transformer for an alternating current frequency converter, which comprises a box body, a base is connected to the inner bottom surface of the box body through screws, an iron core is connected to the inner side of the base through bolts, a winding is wound on the outer surface of the iron core, and a fire extinguishing assembly is connected to the top surface of the box body through bolts. The two sides of the box body are connected with dustproof plates through screws, and side plates are installed on the inner wall of the box body. The smoke sensor is arranged to monitor the interior of the box body in real time, once smoke is detected, a signal is sent to the controller, the controller controls the electric push rod to drive the curved bar to enable the hammer to break the glass tube, and carbon dioxide gas and dry powder in the pressure storage type gas cylinder are sprayed out to extinguish fire; the sprayed gas powder impacts the fire blanket, the weight of the fire blanket is increased, the fire blanket is pulled down, related parts are driven to enable the cover plate to ascend to shield the ventilation opening, smoke leakage is prevented, and the safety performance of the transformer is greatly improved through the overall structure.

Description

Technical Field

[0001] The present invention relates to the technical field of isolation transformers, and particularly to a safe and energy-saving isolation transformer for an AC frequency converter. Background Art

[0002] When an AC frequency converter is operating, it will generate a large amount of harmonics and electromagnetic interference. These will not only pollute the power grid and affect the normal operation of other electrical equipment, but may also interfere with the control circuit of the frequency converter itself, reducing its stability and reliability. An isolation transformer can effectively isolate the electrical connection between the AC frequency converter and the power grid, block the propagation path of harmonics and electromagnetic interference, and provide a relatively stable and pure power supply environment for the AC frequency converter, thereby improving the working performance and service life of the AC frequency converter. At the same time, the isolation transformer can also protect the safety of personnel and equipment to a certain extent and prevent electric shock accidents. Therefore, an AC frequency converter usually needs to be equipped with an isolation transformer.

[0003] However, the isolation transformers for AC frequency converters currently on the market have obvious shortcomings in terms of safety protection structure. During the long-term operation of the transformer, due to various faults such as winding short circuit, overload, and core heating, it is extremely easy to cause internal fires. Once a fire breaks out, if it cannot be extinguished in time, the fire will spread rapidly, not only causing devastating damage to the transformer itself, but also possibly affecting the surrounding electrical equipment and facilities. Traditional isolation transformers often rely only on external fire-fighting facilities for extinguishing fires. However, during the time difference from the occurrence of the fire to the manual discovery and activation of fire-fighting measures, the fire may have caused irreparable losses. This will not only lead to production interruption and huge economic losses, but also pose a serious threat to personnel safety due to the complexity and danger of electrical fires, greatly restricting the safe and reliable operation of AC frequency converters and related power systems. Summary of the Invention

[0004] (1) Technical Problems to be Solved

[0005] Aiming at the deficiencies of the prior art, the present invention provides a safe and energy-saving isolation transformer for an AC frequency converter, which has the function of automatically extinguishing fires after the transformer malfunctions and catches fire, greatly improving the safety performance, etc., and solving the above technical problems.

[0006] (2) Technical Solutions

[0007] To achieve the above object of automatically extinguishing fire after the transformer malfunctions and greatly improving the safety performance, the present invention provides the following technical solution: A safety and energy-saving isolation transformer for an AC frequency converter, comprising a box body. The inner bottom surface of the box body is connected to a base by screws. The inner side of the base is connected to an iron core by bolts. A winding is wound around the outer surface of the iron core. A fire extinguishing component is connected to the top surface of the box body by bolts. And dust-proof plates are connected to both sides of the box body by screws. A side plate is installed on the inner wall of the box body. A controller and a smoke sensor are connected to the outer surface of the side plate by screws. A trigger component is installed on the inner top surface of the box body;

[0008] The fire extinguishing component includes a pressure storage gas cylinder filled with carbon dioxide gas and dry powder. And the bottom of the pressure storage gas cylinder is fixedly connected to a spray pipe. The bottom end of the spray pipe is threadedly connected to a rotary cap. The center of the bottom of the rotary cap is fixedly connected to a horn nozzle. A glass tube is fixedly connected inside the horn nozzle;

[0009] The trigger component includes an ear plate. An electric push rod is rotatably connected to the outer surface of the ear plate. The output end of the electric push rod is rotatably connected to a curved rod. A suspension plate is rotatably connected to the bent portion of the curved rod. And a hammer is fixedly connected to one end of the curved rod.

[0010] Preferably, three windings are wound around the outer surface of the iron core. The top and bottom ends of the windings abut against wire clamping discs. Two base plates are connected to the top of the iron core by bolts. An access terminal is clamped on the top of one of the base plates. And an output terminal is clamped on the top of the other base plate.

[0011] Preferably, the base includes an L-shaped channel steel. The bottom of the L-shaped channel steel is connected to an upper pressing piece by bolts. The center of the bottom surface of the upper pressing piece is fixedly connected to a sleeve rod. And an annular air cushion is in close contact with the bottom surface of the upper pressing piece. The bottom of the annular air cushion is in close fit with a lower pressing piece. The center of the top surface of the lower pressing piece is fixedly connected to a sleeve. A compression spring is sleeved on the outer surface of the sleeve.

[0012] Preferably, the base further includes a sleeve cover threadedly connected to the top end of the sleeve. A magnetic block one is fixedly connected to the bottom end of the sleeve rod. A magnetic block two is embedded in the inner bottom surface of the sleeve. The magnetic block one and the magnetic block two repel each other magnetically.

[0013] Preferably, an L-shaped block is fixedly connected to the outer surface of the pressure storage gas cylinder. The L-shaped block is connected to the top of the box body by bolts. The controller and the smoke sensor are connected by wires. And the controller and the electric push rod are connected by wires.

[0014] Preferably, a circular hole is formed in the center of the upper surface of the box body, a spray pipe is inserted into the circular hole, and the fire extinguishing assembly further includes an inflation nozzle which is threadedly connected to the top surface of the pressure storage cylinder.

[0015] Preferably, an auxiliary assembly is further arranged inside the box body. The auxiliary assembly includes a guide plate welded to the inner wall of the box body. A guide wheel is in sliding contact with the inside of the guide plate. The shaft end of the guide wheel is rotatably connected to a cover plate, and a first steel wire thin rope is fixedly connected to the center of the top end of the cover plate.

[0016] Preferably, one end of the first steel wire thin rope is fixedly connected to an auxiliary rod, two ends of the auxiliary rod are tied with second steel wire thin ropes, one end of each second steel wire thin rope is tied with a fire extinguishing blanket, and the outer surface of the first steel wire thin rope is in sliding contact with a pulley.

[0017] Preferably, foot columns are welded to the outer surface of the guide plate. One end of each foot column is connected to a hole plate by a screw, and a fan and a temperature control switch are installed on the end surface of the hole plate.

[0018] Preferably, a box door is hinged to the front of the box body, and a handle is fixedly connected to the top surface of the box body.

[0019] Compared with the prior art, the present invention provides a safety and energy-saving isolation transformer for an AC frequency converter, and has the following beneficial effects:

[0020] 1. For the safety and energy-saving isolation transformer for an AC frequency converter provided by the present invention, by arranging a smoke sensor to monitor the inside of the box body in real time, once smoke is detected, a signal is sent to the controller. The controller controls the electric push rod to drive the curved rod to make the hammer break the glass tube, and carbon dioxide gas and dry powder in the pressure storage cylinder are sprayed out for fire extinguishing; the sprayed gas and powder impact the fire extinguishing blanket, increasing its weight and pulling it down, driving related components to raise the cover plate to block the ventilation opening, preventing smoke leakage, and the fire extinguishing blanket covers the key components for fire extinguishing, avoiding a large amount of dry powder being directly sprayed on the components, facilitating subsequent maintenance. The overall structure greatly improves the safety performance of the transformer.

[0021] 2. For the safety and energy-saving isolation transformer for an AC frequency converter provided by the present invention, in terms of shock absorption and protection, the L-shaped channel steel of the base supports components such as the iron core and winding. The annular air cushion between the upper pressing piece and the lower pressing piece utilizes the compressibility of the gas to buffer the vibration during the operation of the transformer, reducing the outward transmission of vibration; the sleeve rod and the sleeve cooperate, and the compression spring of the outer sleeve absorbs the vibration energy through elastic deformation, weakening the vibration amplitude; the first magnet at the bottom end of the sleeve rod and the second magnet in the sleeve repel each other magnetically to resist vibration. These components disperse, absorb and buffer vibration in different ways, protecting the internal components of the transformer and ensuring its stable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a three-dimensional schematic diagram of the structure of the present invention;

[0023] Figure 2 Front schematic view of the structure of the present invention;

[0024] Figure 3 For the present invention Figure 2 Schematic cross-sectional view of A-A in the present invention;

[0025] Figure 4 For the present invention Figure 3 Schematic enlarged partial view of A in the present invention;

[0026] Figure 5 Stereoscopic schematic view of components such as the iron core and winding in the structure of the present invention;

[0027] Figure 6 Schematic cross-sectional view of the base in the structure of the present invention;

[0028] Figure 7 Stereoscopic schematic view of the auxiliary component in the structure of the present invention;

[0029] Figure 8 For the present invention Figure 7 Schematic enlarged partial view of B in the present invention.

[0030] Wherein: 1, box body; 2, base; 201, L-shaped channel steel; 202, upper pressing plate; 203, sleeve rod; 204, annular air cushion; 205, lower pressing plate; 206, sleeve; 207, compression spring; 208, sleeve cover; 209, magnet one; 210, magnet two; 3, iron core; 4, winding; 5, fire extinguishing component; 51, pressure storage gas cylinder; 52, ejection pipe; 53, screw cap; 54, horn nozzle; 55, glass tube; 56, L-shaped block; 57, inflation nozzle; 6, dust-proof plate; 7, side plate; 8, controller; 9, smoke sensor; 10, triggering component; 101, ear plate; 102, electric push rod; 103, curved rod; 104, hanging plate; 105, hammer; 11, wire clamping disc; 12, base plate; 13, access terminal; 14, output terminal; 15, auxiliary component; 151, guide plate; 152, guide wheel; 153, cover plate; 154, steel wire thin rope one; 155, auxiliary rod; 156, steel wire thin rope two; 157, fire blanket; 158, pulley; 16, foot post; 17, hole plate; 18, fan; 19, temperature control switch; 20, box door; 21, handle. Specific embodiments

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] Please refer to Figures 1-8 Figures 1-8 , a safety and energy-saving isolation transformer for an AC frequency converter, including a box body 1, a base 2 is connected to the inner bottom surface of the box body 1 by screws, an iron core 3 is connected to the inner side of the base 2 by bolts, a winding 4 is wound around the outer surface of the iron core 3, a fire extinguishing component 5 is connected to the top surface of the box body 1 by bolts, and dust-proof plates 6 are connected to both sides of the box body 1 by screws. A side plate 7 is installed on the inner wall of the box body 1, and a controller 8 and a smoke sensor 9 are connected to the outer surface of the side plate 7 by screws. A trigger component 10 is installed on the inner top surface of the box body 1;

[0033] The fire extinguishing component 5 includes a pressure storage gas cylinder 51 filled with carbon dioxide gas and dry powder, and a spray pipe 52 is fixedly connected to the bottom of the pressure storage gas cylinder 51. The bottom end of the spray pipe 52 is threadedly connected with a rotary cover 53, and a horn nozzle 54 is fixedly connected to the center of the bottom of the rotary cover 53. A glass tube 55 is fixedly connected inside the horn nozzle 54;

[0034] The trigger component 10 includes an ear plate 101, an electric push rod 102 is rotatably connected to the outer surface of the ear plate 101, the output end of the electric push rod 102 is rotatably connected to a curved rod 103, a hanging plate 104 is rotatably connected to the bent part of the curved rod 103, and a hammer 105 is fixedly connected to one end of the curved rod 103.

[0035] Specifically, three groups of windings 4 are wound around the outer surface of the iron core 3. The top and bottom ends of the windings 4 abut against a wire clamping disc 11. Two base plates 12 are connected to the top of the iron core 3 by bolts. An access terminal 13 is clamped to the top of one of the base plates 12, and an output terminal 14 is clamped to the top of the other base plate 12.

[0036] The advantages are that the iron core 3, as the core component of the transformer, provides a magnetic circuit for the winding 4, can enhance the magnetic field and concentrate the magnetic lines of force, enabling efficient transfer of electrical energy between the windings 4. The winding 4 is wound around the outer surface of the iron core 3. Through the principle of electromagnetic induction, the electrical energy introduced through the access terminal 13 is converted into magnetic energy, and then the magnetic energy is converted back into electrical energy and output from the output terminal 14. The access terminal 13 is used to connect to an external power supply, and the output terminal 14 outputs the electrical energy that has been transformed and isolated by the transformer to supply the AC frequency converter, ensuring its stable operation.

[0037] Specifically, the base 2 includes an L-shaped channel steel 201, an upper pressing piece 202 is connected to the bottom of the L-shaped channel steel 201 by bolts, a sleeve rod 203 is fixedly connected to the center of the bottom surface of the upper pressing piece 202, and an annular air cushion 204 is in close contact with the bottom surface of the upper pressing piece 202. A lower pressing piece 205 is closely attached to the bottom of the annular air cushion 204, and a sleeve 206 is fixedly connected to the center of the top surface of the lower pressing piece 205. A compression spring 207 is sleeved on the outer surface of the sleeve 206.

[0038] Specifically, the base 2 further includes a sleeve cap 208 which is threadedly connected to the top end of the sleeve 206. A first magnet 209 is fixedly connected to the bottom end of the sleeve rod 203, and a second magnet 210 is embedded in the inner bottom surface of the sleeve 206. The first magnet 209 and the second magnet 210 repel each other magnetically.

[0039] The advantages are as follows: The L-shaped channel steel 201 serves as the basic structure of the base 2 and can support components such as the iron core 3 and the winding 4. The annular air cushion 204 provided between the upper pressing piece 202 and the lower pressing piece 205 can effectively buffer the vibration generated during the operation of the transformer by utilizing the compressibility of the gas, reducing the transmission of vibration to the box body 1 and the outside. At the same time, the sleeve rod 203 cooperates with the sleeve 206, and the compression spring 207 sleeved outside the sleeve 206 can absorb the vibration energy through elastic deformation when subjected to vibration, further weakening the vibration amplitude. In addition, the first magnet 209 at the bottom end of the sleeve rod 203 and the second magnet 210 embedded in the inner bottom surface of the sleeve 206 repel each other magnetically, and the generated repulsive force can also resist vibration to a certain extent. When the base 2 bears vibration, these components disperse, absorb and buffer the vibration in different ways, achieving a good shock absorption effect, thereby protecting components such as the iron core 3 and the winding 4 inside the transformer from the influence of vibration and ensuring the stable operation of the transformer.

[0040] Specifically, an L-shaped block 56 is fixedly connected to the outer surface of the pressure storage gas cylinder 51, and the L-shaped block 56 is connected to the top of the box body 1 by bolts. The controller 8 and the smoke sensor 9 are connected by wires, and the controller 8 and the electric push rod 102 are connected by wires.

[0041] Specifically, a circular hole is opened at the center of the upper surface of the box body 1, and a spray pipe 52 is inserted into the circular hole. The fire extinguishing assembly 5 further includes an inflation nozzle 57 which is threadedly connected to the top surface of the pressure storage gas cylinder 51.

[0042] The advantages are as follows. By setting up the smoke sensor 9, it can detect in real time whether there is smoke inside the box body 1. Once smoke appears, it indicates that the transformer is working abnormally and a fire is about to break out. When the smoke sensor 9 detects smoke, it will immediately send a signal to the controller 8. The controller 8 then turns on the electric push rod 102, causing its push rod end to extend and drive the curved rod 103 to rotate around the axis where it is connected to the hanging plate 104. In this way, the curved rod 103 drives the hammer 105 to move upward and break the glass tube 55. After the glass tube 55 is broken, the carbon dioxide gas and dry powder injected into the pressure storage cylinder 51 will be ejected from the spray pipe 52 and then sprayed out from the horn nozzle 54. In this way, the fire can be extinguished in time. When the carbon dioxide gas and dry powder inside the pressure storage cylinder 51 are exhausted, the rotary cover 53 can be rotated to separate it from the spray pipe 52. In this way, the pressure storage cylinder 51 can be refilled with dry powder. Then, the rotary cover 53 is tightened again and a new glass tube 55 is reinstalled. The pressure storage cylinder 51 can be refilled with carbon dioxide gas again through the inflation equipment cooperating with the inflation nozzle 57. In this way, the fire extinguishing component 5 can be reused.

[0043] Specifically, an auxiliary component 15 is also arranged inside the box body 1. The auxiliary component 15 includes a guide plate 151 welded to the inner wall of the box body 1. A guide wheel 152 is in sliding contact inside the guide plate 151. The shaft end of the guide wheel 152 is rotatably connected to a cover plate 153. A first steel wire thin rope 154 is fixedly connected to the center of the top end of the cover plate 153.

[0044] Specifically, one end of the first steel wire thin rope 154 is fixedly connected to an auxiliary rod 155. Two second steel wire thin ropes 156 are tied to both ends of the auxiliary rod 155. One end of the second steel wire thin rope 156 is tied to a fire extinguishing blanket 157. The outer surface of the first steel wire thin rope 154 is in sliding contact with a pulley 158.

[0045] The advantages are as follows. When the carbon dioxide gas carrying dry powder is sprayed out from the horn nozzle 54, it will impact on the fire extinguishing blanket 157. In this way, the increased weight of the fire extinguishing blanket 157 will cause it to move downward, thereby pulling the second steel wire thin rope 156. The second steel wire thin rope 156 drives the auxiliary rod 155, the auxiliary rod 155 drives the first steel wire thin rope 154, and the first steel wire thin rope 154 can pull the cover plate 153 to rise with the assistance of the pulley 158. Since the two sides of the cover plate 153 are rotatably connected to the guide wheels 152 and the guide wheels 152 are in sliding contact with the guide plate 151, the cover plate 153 has little resistance during the rising process. When the cover plate 153 rises to the height of the dust-proof plate 6, it can block the ventilation opening of the box body 1, thus preventing smoke from leaking out of the box body 1. And by spraying dry powder on the fire extinguishing blanket 157, the fire extinguishing blanket 157 covers key components of the transformer such as the winding 4 under the action of gravity. On the one hand, it can play a role in extinguishing the fire, and on the other hand, it can also prevent a large amount of dry powder from being directly sprayed on components such as the winding 4, providing convenience for subsequent maintenance of these components.

[0046] Specifically, a foot post 16 is welded to the outer surface of the guide plate 151. One end of the foot post 16 is connected to a hole plate 17 by a screw. A fan 18 and a temperature control switch 19 are installed on the end face of the hole plate 17.

[0047] Specifically, a box door 20 is hinged to the front of the box body 1, and a handle 21 is fixedly connected to the top surface of the box body 1.

[0048] The advantage is that the installed temperature control switch 19 can detect the temperature change inside the box body 1. When the temperature reaches the set threshold, it connects the circuit of the fan 18 to turn on the fan 18, so as to dissipate heat from components such as the winding 4. The provided handle 21 can facilitate lifting the whole component, and together with the moving wheels at the bottom of the box body 1, it can conveniently move the whole transformer.

[0049] During use, first connect the terminal 13 to an external power supply. Electric energy is converted through electromagnetic induction by the winding 4 under the action of the iron core 3 and output from the output terminal 14 to an AC frequency converter. During operation, the base 2 works together with components such as the annular air cushion 204, the compression spring 207, and the repulsive force between the first magnetic block 209 and the second magnetic block 210 to buffer and absorb the vibration generated during the operation of the transformer and protect the internal components. The smoke sensor 9 monitors the smoke inside the box body 1 in real time. When smoke is detected, it sends a signal to the controller 8. The controller 8 controls the electric push rod 102 to act, drives the curved rod 103 to make the hammer 105 break the glass tube 55. The carbon dioxide gas and dry powder in the pressure storage gas cylinder 51 are ejected through the ejection pipe 52 and the horn nozzle 54 to impact the fire extinguishing blanket 157. The fire extinguishing blanket 157 pulls the second steel wire thin rope 156, drives the auxiliary rod 155 and the first steel wire thin rope 154, so that the cover plate 153 rises to block the ventilation opening of the box body 1 to prevent smoke leakage. At the same time, the fire extinguishing blanket 157 covers components such as the winding 4 to extinguish the fire and avoid a large amount of dry powder being sprayed on the components. The temperature control switch 19 detects the temperature inside the box body 1. When the set threshold is reached, it connects the circuit of the fan 18 to dissipate heat from components such as the winding 4. When the gas and dry powder in the pressure storage gas cylinder 51 are exhausted, the rotary cover 53 can be rotated to fill the dry powder, replace the glass tube 55, and refill the carbon dioxide gas through the inflation nozzle 57.

[0050] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A safety and energy-saving isolation transformer for an AC frequency converter, comprising a box body (1), characterized in that: The inner bottom surface of the box body (1) is connected with a base (2) by screws. The inner side of the base (2) is connected with an iron core (3) by bolts. A winding (4) is wound around the outer surface of the iron core (3). The top surface of the box body (1) is connected with a fire extinguishing component (5) by bolts. And both sides of the box body (1) are connected with dust-proof plates (6) by screws. A side plate (7) is installed on the inner wall of the box body (1). A controller (8) and a smoke sensor (9) are connected to the outer surface of the side plate (7) by screws. A trigger component (10) is installed on the inner top surface of the box body (1). The fire extinguishing component (5) includes a pressure storage gas cylinder (51). Carbon dioxide gas and dry powder are filled in the pressure storage gas cylinder (51). And the bottom of the pressure storage gas cylinder (51) is fixedly connected with a spray pipe (52). The bottom end of the spray pipe (52) is threadedly connected with a rotary cap (53). The center of the bottom of the rotary cap (53) is fixedly connected with a horn nozzle (54). A glass tube (55) is fixedly connected inside the horn nozzle (54). The trigger component (10) includes an ear plate (101). An electric push rod (102) is rotatably connected to the outer surface of the ear plate (101). The output end of the electric push rod (102) is rotatably connected with a curved rod (103). A suspension plate (104) is rotatably connected to the bent part of the curved rod (103). And a hammer (105) is fixedly connected to one end of the curved rod (103).

2. The safety and energy-saving isolation transformer for an AC frequency converter according to claim 1, wherein: Three windings (4) are wound around the outer surface of the iron core (3). The top end and the bottom end of the winding (4) abut against a wire clamping disc (11). Two base plates (12) are connected to the top end of the iron core (3) by bolts. An access terminal (13) is clamped on the top of one of the base plates (12). And an output terminal (14) is clamped on the top of the other base plate (12).

3. A safety and energy-saving isolation transformer for an AC frequency converter according to claim 1, characterized in that: The base (2) includes an L-shaped channel steel (201). An upper pressing piece (202) is connected to the bottom of the L-shaped channel steel (201) by bolts. A sleeve rod (203) is fixedly connected to the center of the bottom surface of the upper pressing piece (202). And an annular air cushion (204) is in close contact with the bottom surface of the upper pressing piece (202). The bottom of the annular air cushion (204) is closely attached to a lower pressing piece (205). A sleeve (206) is fixedly connected to the center of the top surface of the lower pressing piece (205). A compression spring (207) is sleeved on the outer surface of the sleeve (206).

4. A safety and energy-saving isolation transformer for an AC frequency converter according to claim 3, characterized in that: The base (2) further includes a sleeve cover (208). The sleeve cover (208) is threadedly connected to the top end of the sleeve (206). A magnet one (209) is fixedly connected to the bottom end of the sleeve rod (203). A magnet two (210) is embedded in the inner bottom surface of the sleeve (206). The magnet one (209) and the magnet two (210) repel each other magnetically.

5. A safety and energy-saving isolation transformer for an AC frequency converter according to claim 1, characterized in that: The outer surface of the pressure storage gas cylinder (51) is fixedly connected with an L-shaped block (56), and the L-shaped block (56) is connected to the top of the box body (1) through bolts. The controller (8) is connected with the smoke sensor (9) through a wire, and the controller (8) is connected with the electric push rod (102) through a wire.

6. The safety and energy-saving isolation transformer for an AC frequency converter according to claim 1, wherein: A circular hole is formed in the center of the upper surface of the box body (1), and a spray pipe (52) is inserted into the circular hole. The fire extinguishing assembly (5) further includes an inflation nozzle (57), and the inflation nozzle (57) is threadedly connected to the top surface of the pressure storage gas cylinder (51).

7. A safety and energy-saving isolation transformer for an AC frequency converter according to claim 1, characterized in that: An auxiliary assembly (15) is further arranged inside the box body (1). The auxiliary assembly (15) includes a guide plate (151) welded to the inner wall of the box body (1). A guide wheel (152) is in sliding contact with the inside of the guide plate (151). The shaft end of the guide wheel (152) is rotatably connected to a cover plate (153), and a first steel wire thin rope (154) is fixedly connected to the center of the top end of the cover plate (153).

8. A safety and energy-saving isolation transformer for an AC frequency converter according to claim 7, characterized in that: One end of the first steel wire thin rope (154) is fixedly connected with an auxiliary rod (155). Two second steel wire thin ropes (156) are tied to both ends of the auxiliary rod (155). One end of each second steel wire thin rope (156) is tied to a fire extinguishing blanket (157). The outer surface of the first steel wire thin rope (154) is in sliding contact with a pulley (158).

9. A safety and energy-saving isolation transformer for an AC frequency converter according to claim 7, characterized in that: Foot columns (16) are welded to the outer surface of the guide plate (151). One end of each foot column (16) is connected with a hole plate (17) through a screw. A fan (18) and a temperature control switch (19) are installed on the end face of the hole plate (17).

10. A safety and energy-saving isolation transformer for an AC frequency converter according to claim 1, characterized in that: A box door (20) is hinged to the front of the box body (1), and a handle (21) is fixedly connected to the top surface of the box body (1).

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