CN212700165U - Multi-medium mixing device for extra-high voltage converter transformer and fire fighting system - Google Patents

Abstract

The utility model provides a special high voltage current conversion transformer is with many medium mixing arrangement, including the compound venturi and the hybrid pipeline that connect gradually, compound venturi include with the inlayer venturi of dry powder pipeline intercommunication and with the outer venturi of foam pipeline intercommunication, inlayer venturi nestification is in outer venturi, outer venturi and hybrid pipeline intercommunication, inlayer venturi's export is in before outer venturi's outer throat. The utility model discloses the fire extinguishing system who uses this mixing arrangement has still been provided. The utility model has the advantages that: the pipeline sectional area reduces when inlayer throat after superfine dry powder gets into inlayer venturi to accelerate superfine dry powder, superfine dry powder can accelerate with higher speed the mixture with compressed air foam, accelerates through outer throat again, promotes the homogeneous mixing of two kinds of media, makes compressed air foam can carry out effectual parcel to superfine dry powder, the phenomenon of disperse distribution can not appear.

Description

Multi-medium mixing device for extra-high voltage converter transformer and fire fighting system

Technical Field

The utility model relates to an extra-high voltage trades power station fire control facility technical field, especially relates to an extra-high voltage converter transformer is with multi-medium mixing arrangement and fire extinguishing system.

Background

In long-distance power transmission, an extra-high voltage direct current transmission technology is implemented on a large scale in engineering application because of the characteristics of large transmission capacity, long transmission distance, small transmission loss and the like compared with an extra-high voltage alternating current transmission technology, however, a converter substation is required to be configured for direct current and alternating current conversion in extra-high voltage transmission; the construction and operation cost of the converter transformer substation far exceed those of an extra-high voltage alternating-current transformer substation with the same voltage class and transmission capacity, combustible transformer oil weighing hundreds of tons is filled in the converter transformer in the operation process of the converter transformer, if a fault occurs in the converter transformer, the converter transformer generates physical explosion under the action of fault electric arc, meanwhile, the converter transformer oil also generates a large amount of combustible gas, the combustible gas and the converter transformer oil are sprayed out from a weak part/notch of the converter transformer, and after the concentration of the sprayed combustible gas and the concentration of the converter transformer oil in the air reach an explosion limit, chemical explosion is generated and the converter transformer oil is combusted in an overflowing manner, so that the fire spread is caused.

The main fire extinguishing measures adopted in the ultra-high voltage converter station at present have good cooling capacity and capability of preventing fire from reburning, but the instantaneous fire control capability of the foam fire extinguishing system is relatively limited; the fire control capability of the dry powder fire-fighting system is extremely strong, and the single-prevention and re-combustion capability is relatively insufficient. Therefore, in the prior art, a suspended dry powder ball is arranged at a part which is easy to explode and ignite, such as a tap switch of an extra-high voltage converter transformer, and the like, the temperature sensing glass ball is arranged at the position of a nozzle, under the normal condition, the upper end of the glass ball props against a sealing sheet at the position of the nozzle, the environmental temperature is raised in the fire disaster, liquid in the glass ball is broken after being heated and expanded, the sealing sheet automatically falls off, dry powder medicament in a fire extinguishing device is sprayed out by a character nozzle under the action of nitrogen, the fire is extinguished, however, when the common suspended dry powder ball is subjected to thermal explosion, splashed ball fragments can damage a foam spray nozzle.

The utility model patent with publication number CN203971251U discloses a mixed liquid of pneumatic type dry powder and foam mixes device of putting out a fire through making fire water and foam stoste proportional mixing then mix at the shower nozzle entrance with the dry powder, but the dry powder does not have the ability of repelling water and easily mixes with water or foam in pipeline and shower nozzle exit, can't realize the foam to the parcel of dry powder, probably erupts mud form or suspension even, is difficult to deal with the manifold fire mode of extra-high voltage converter transformer form. The utility model discloses a utility model patent for CN209392657U provides a suspension type dry powder extinguishing device linkage pneumatic system, puts the dry powder through starting drive is automatic when having the condition of a fire and puts out a fire, but suspension type dry powder quantity is limited, and probably appears repeatedly in the development of the condition of a fire, and the use strategy of dry powder and foam needs to carry out the linkage along with the demand of accuse fire or putting out a fire and switch, consequently the different fire mode of special high voltage converter transformer can't be adapted to this patent equally.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a multimedium mixing arrangement of parcel dry powder that can make the foam even is provided to and can switch fire extinguishing medium according to the intensity of a fire, accuse fire and the fire extinguishing system that the ability of putting out a fire is strong.

The utility model discloses a solve above-mentioned technical problem through following technical scheme: the utility model provides an extra-high voltage current conversion transformer is with many medium mixing arrangement, is including the compound venturi and the hybrid pipeline that connect gradually, compound venturi include with the inner venturi of dry powder pipeline intercommunication and with the outer venturi of foam pipeline intercommunication, inner venturi nestification is in outer venturi, outer venturi and hybrid pipeline intercommunication, the export of inner venturi is before outer venturi's outer throat.

The utility model discloses the pipeline sectional area reduces when well superfine dry powder gets into behind the inlayer venturi through the inlayer throat, thereby accelerate superfine dry powder, the superfine dry powder that leaves from inlayer venturi can mix with the compressed air foam in the outer venturi with higher speed, the mixed medium after mixing accelerates once more after flowing through outer throat, promote the homogeneous mixing of two kinds of media, thereby make the compressed air foam can carry out effectual parcel to superfine dry powder, the phenomenon of diffuse distribution can not appear, make the fire-fighting medium can effectually mix and put out a fire.

Preferably, the throat of the inner venturi tube and the throat of the outer venturi tube are both close to the respective outlets.

Preferably, a vortex flow passage which penetrates through the mixing pipeline along the axial direction is arranged in the mixing pipeline.

Preferably, a plurality of vortex flow channels are uniformly arranged on the mixing pipeline along the circumferential direction.

Preferably, the dry powder pipeline comprises a high-pressure gas generating device and an ultrafine dry powder container which are communicated in sequence; the high-pressure gas generating device can provide high-speed airflow and supply the airflow to the superfine dry powder container through a gas pipeline, a flow speed regulating valve is arranged on the gas pipeline, a superfine dry powder adding pipeline is arranged on the superfine dry powder container, and a dry powder pipeline electronic valve is arranged between the superfine dry powder container and the composite Venturi tube.

Preferably, the foam pipeline comprises a compressed air foam generating device, and a compressed air foam pipeline electronic valve is arranged between the compressed air foam generating device and the composite venturi tube.

Preferably, the dry powder pipeline electronic valve and the compressed air foam pipeline electronic valve can be operated remotely and manually.

Preferably, the outlet of the mixing pipeline is connected to a main fire-fighting pipeline, and a plurality of release nozzles are arranged on the main fire-fighting pipeline.

Preferably, the main fire fighting pipeline is nested in the explosion-proof pipe, the release nozzle is communicated with the main fire fighting pipeline and exposed on one side of the explosion-proof pipe facing the converter transformer, and the position where the release nozzle is connected with the main fire fighting pipeline is hidden in the explosion-proof pipe.

The utility model also provides an use special high voltage current conversion transformer use multi-media mixing arrangement's fire extinguishing system, inlayer venturi produces the device through high-pressure gas and accelerates superfine dry powder, outer venturi produces the device through compressed air foam and produces the compressed air foam, and fire extinguishing system includes the alarm system who produces device and high-pressure gas with the compressed air foam and produce device communication connection, alarm system communication connection has fire detector, and when fire detector detected to have the naked light, alarm system control compressed air foam produces device and high-pressure gas and produces the device simultaneous working, and when the fire detector signal becomes to have not the naked light by having the naked light, alarm system closed high-pressure gas and produces the device, and compressed air foam produces the device and keeps working.

The utility model provides an extra-high voltage converter transformer is with multimedium mixing arrangement and fire extinguishing system's advantage lies in: the pipeline sectional area reduces when the inlayer throat after superfine dry powder gets into inlayer venturi, thereby accelerate superfine dry powder, the superfine dry powder that leaves from inlayer venturi can mix with higher speed with the compressed air foam in the outer venturi, the mixed medium after the mixture accelerates once more after flowing through outer throat, promote the homogeneous mixing of two kinds of media, thereby make the compressed air foam carry out effectual parcel to superfine dry powder, the phenomenon of disperse distribution can not appear, make the fire control medium can effectually mix and put out a fire. The mixing pipeline is provided with the vortex flow channel, so that the fire-fighting medium can be accelerated, the mixing effect is improved, the coverage range of the spray head is increased, the flow velocity of the high-pressure gas can be regulated through the high-pressure gas generating device and the flow velocity regulating valve, the mixing pipeline is convenient to apply, and both the dry powder pipeline electronic valve and the compressed air foam pipeline electronic valve support remote control operation and manual operation; the application is convenient; the fire-fighting system can change the fire-fighting medium used according to different flexible fire conditions, thereby efficiently and safely carrying out fire-fighting operation and realizing linkage switching of dry powder and foam in fire control and fire extinguishing operation.

Drawings

Fig. 1 is a schematic diagram of a multi-media mixing device for an extra-high voltage converter transformer according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a composite venturi tube of a multi-medium mixing device for an extra-high voltage converter transformer according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a mixing pipeline of a multi-medium mixing device for an extra-high voltage converter transformer according to an embodiment of the present invention;

fig. 4 is a cross-sectional view of a mixing pipeline of the multi-media mixing device for the extra-high voltage converter transformer according to an embodiment of the present invention;

fig. 5 is a schematic diagram of a release nozzle of the multi-medium mixing device for the extra-high voltage converter transformer according to one embodiment of the present invention cooperating with a main fire pipeline;

fig. 6 is a schematic diagram of the matching between the release nozzle of the multi-medium mixing device for the extra-high voltage converter transformer and the main fire fighting pipeline according to the second embodiment of the present invention;

fig. 7 is a schematic diagram of the cooperation of the release nozzle of the multi-medium mixing device for the extra-high voltage converter transformer and the main fire-fighting pipeline provided by the third embodiment of the present invention;

fig. 8 is a schematic view of the release nozzle of the multi-medium mixing device for the extra-high voltage converter transformer according to the fourth embodiment of the present invention cooperating with the main fire pipeline;

fig. 9 is a schematic view of a multi-medium combined fire extinguishing system for an extra-high voltage converter transformer according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings.

Referring to fig. 1, the embodiment provides a multi-medium mixing device for an extra-high voltage converter transformer, which includes a composite venturi tube 1 and a mixing pipeline 2 connected in sequence; with reference to fig. 2, the composite venturi tube 1 includes an inner venturi tube 11 communicated with the dry powder pipeline 3 and an outer venturi tube 12 communicated with the foam pipeline 4, the inner venturi tube 11 is nested in the outer venturi tube 12, the outer venturi tube 12 is communicated with the mixing pipeline 2, and the outlet of the inner venturi tube 11 is located in front of the outer throat 121 of the outer venturi tube 12.

Superfine dry powder gets into behind inlayer venturi 11 in this embodiment when the pipeline sectional area reduces through inlayer throat 111, thereby accelerate superfine dry powder, the superfine dry powder that leaves from inlayer venturi 11 can mix with higher speed with the compressed air foam in outer venturi 12, the mixed medium flow through after outer throat 121 after mixing accelerates again, promote the homogeneous mixing of two kinds of media, thereby make the compressed air foam can carry out effectual parcel to superfine dry powder, the phenomenon of diffuse distribution can not appear, make the fire control medium can effectually mix and put out a fire.

The throats of the inner-layer Venturi tube 11 and the outer-layer Venturi tube 12 are both arranged close to the respective outlets, so that the fire-fighting medium cannot lose flow velocity in the composite Venturi tube 1 after being accelerated through the inner-layer throat 111 and the outer-layer throat 121.

Combine fig. 3 and fig. 4, the inside of hybrid tube 2 has along the vortex runner 21 that the axial runs through, the mixed medium of the superfine dry powder that flows out and the compressed air foam from outer throat 121 department of outer venturi tube 12 gets into vortex runner 21 back fast revolution, the compressed air foam forms the parcel to superfine dry powder, and fast flow out hybrid tube 2, prevent to form superfine dry powder dispersion phenomenon, in this embodiment, on hybrid tube 2, evenly be provided with four vortex runners 21 along circumference, thereby can give and ensure the capacity, prevent that the medium from piling up at hybrid tube 2's entrance, influence the velocity of flow.

When the composite Venturi tube 1 and the mixing pipeline 2 are connected with each other in a threaded manner through pipelines, and the inner-layer Venturi tube 11 is communicated with the dry powder pipeline 3 in a threaded manner; the outer layer Venturi tube 12 is in threaded connection with the foam pipeline 4 to communicate with the release nozzle.

Referring to fig. 1 again, the dry powder pipeline 3 includes a high-pressure gas generating device 31 and an ultrafine dry powder container 32 which are sequentially communicated; the high-pressure gas generating device 31 can provide high-speed gas flow and supply the high-speed gas flow to the superfine dry powder container 32 through a gas pipeline (not shown), the gas pipeline is provided with a flow velocity regulating valve 33, the superfine dry powder container 32 is provided with a superfine dry powder adding pipeline 34, and a dry powder pipeline electronic valve 36 is arranged between the superfine dry powder container 32 and the composite venturi tube 1; the gas flow rate that high-pressure gas generating device 31 can provide in this embodiment is 10m/s ~ 200m/s, control the gas flow rate through velocity of flow governing valve 33, high-speed gas gets into superfine dry powder container 32, superfine dry powder gets into superfine dry powder container 32 through superfine dry powder addition pipeline 34, then gets into inlayer venturi tube 11 under the impact of high-speed gas flow, high-speed gas flow produces once more behind inlayer throat 121 and accelerates the vacuum degree to superfine dry powder, compensate the velocity of flow loss in dry powder pipeline 3 and inlayer venturi tube 11.

The foam pipeline 4 comprises a compressed air foam generating device 41, and a compressed air foam pipeline electronic valve 42 is arranged between the compressed air foam generating device 41 and the composite Venturi tube 1; the compressed air foam generating means 41 generates compressed air foam and then flows toward the outer venturi tube 12.

The dry powder pipeline electronic valve 36 and the foam pipeline electronic valve 42 are respectively used for controlling the on-off of corresponding pipelines, and both the two electronic valves can be operated by remote control and manual operation in the embodiment, so that the use is convenient.

In use, the present embodiment provides that the outlet of the mixing pipe 2 is connected to a main fire fighting pipe 6, and a plurality of release nozzles 5 are arranged on the main fire fighting pipe 6.

Referring to fig. 5, in order to improve the explosion-proof performance of the main fire fighting pipeline 6, the main fire fighting pipeline 6 is nested inside the explosion-proof pipe 7, the release sprinkler 5 is screwed on the main fire fighting pipeline 6, the release sprinkler 5 is arranged towards the converter transformer, the end of the release sprinkler 5 is outside the explosion-proof pipe 7, and the connection position of the release sprinkler 5 and the main fire fighting pipeline 6 is hidden in the explosion-proof pipe 7. Thereby preventing the main fire-fighting pipeline 6 from being damaged in explosion, and the release nozzle 5 can not deal with the envelope of the fire extinguishing area due to high-temperature deformation.

Referring to fig. 5, the explosion-proof pipe 7 is fixed on a firewall and/or concrete foundation beside the converter transformer in a screwing, welding or pre-embedding manner, a mounting hole 71 for the nozzle 5 to pass through is formed in the explosion-proof pipe 7, a liquid outlet pipe 61 coaxial with the mounting hole 71 is formed in the main fire fighting pipeline 6, an internal thread 62 is formed in the liquid outlet pipe 61, and an external thread 51 screwed with the internal thread 62 is formed in the nozzle 5, so that the nozzle 5 can be screwed and fixed inside the explosion-proof pipe 7. When an explosion occurs, the main fire fighting pipeline 6 may collide with the pipe wall in the explosion-proof pipe 7, in a preferred embodiment, a buffer pad 72 may be disposed in the explosion-proof pipe 7 for buffer protection, and the buffer pad 72 may be disposed inside the explosion-proof pipe 7 or outside the main fire fighting pipeline 6, and for convenience of operation, the buffer pad 72 is generally directly attached to the outside of the main fire fighting pipeline 6, and at least one side of the main fire fighting pipeline 6, which faces away from the converter transformer, is disposed with the buffer pad 72.

The spray head 5 comprises a dome-shaped release circular truncated cone 52 and a fixed pipe 53 fixedly connected with the release circular truncated cone 52, one side, connected with the fixed pipe 53, of the release circular truncated cone 52 is a flat bottom surface, an external thread 51 is arranged on the fixed pipe 53, a release hole 54 is formed in the surface of the release circular truncated cone 52, the aperture and the number of open holes of the release hole 54 are determined according to the fire extinguishing range and the coverage range of the ultra-high voltage converter transformer, the sum of the areas of the release hole 54 is not smaller than the cross-sectional area of the fixed pipe 53, and the diameter of the release hole 54 is 3-10 mm; the fire extinguishing medium is sprayed out through the arc-shaped surface of the release circular truncated cone 52 to extinguish fire in a target area, the fire extinguishing medium is uniformly released, single-point multi-directional coverage is formed, and the adaptability of the ultra-high voltage converter transformer under the condition of explosion fire is improved.

A flat gasket (not shown) and a spring gasket (not shown) are arranged between the flat bottom surface of the release circular truncated cone 52 and the explosion-proof pipe 7, so that the axial stability of the spray head 5 is improved, shaking during explosion is prevented, and in addition, because the spring gasket is in a compression state, axial stabilizing force can be provided when the spray head 5 is disassembled and assembled, and the maintenance and the replacement are convenient.

Referring to fig. 6, a mounting seat (not shown) may be further fixed to a side of the mounting hole 71 facing the converter transformer, the mounting seat is fixedly engaged with the drain pipe 61, so as to fix the drain pipe 61 and improve the stability of the main fire fighting pipeline 6, the mounting seat includes a fixing plate 81 fixedly engaged with an outer wall of the explosion-proof pipe 7, a through hole (not shown) allowing the spray head 5 to pass through is formed in the fixing plate 81, the fixing plate 81 is fixedly engaged with the drain pipe 61, so as to assist in fixing the drain pipe 61 and improve the stability of the main fire fighting pipeline 6, the shape of the fixing plate 81 is adaptively engaged with the explosion-proof pipe 7, in this embodiment, the fixing plate 81 is directly welded or screwed to the end of the drain pipe 61, at this time, the shaking range of the main fire fighting pipeline 6 is limited, and the cushion pad 72 for protecting the main fire fighting pipeline 6 may be eliminated.

Referring to fig. 7, in the embodiment, the end of the liquid outlet pipe 61 extends out of the explosion-proof pipe 7, the diameter of the through hole of the fixing plate 81 is larger than that of the liquid outlet pipe 61, the end of the fixing plate 81 is provided with a first transition plate 82 fixedly connected with the end of the liquid outlet pipe 61, the first transition plate 82 is integrally formed or welded and fixed with the fixing plate 81, and the first transition plate 82 is welded or screwed and fixed with the liquid outlet pipe 61. The first transition plate 82 forms an obtuse angle with the fixing plate 81 and an acute angle with the axial direction of the liquid outlet pipe 61.

When the nozzle 5 is subjected to an axial explosion impact force, a part of the pressure can be released by the deformation of the first transition plate 82, preventing the nozzle 5 from being damaged.

For the solutions shown in fig. 6 and 7, since the end of the liquid outlet pipe 61 is finally flush with the explosion-proof pipe 7 or extends out of the explosion-proof pipe 7, the diameter of the explosion-proof pipe 7 needs to be larger than that of the main fire-fighting pipe 6, so as to ensure that the main fire-fighting pipe 6 with the liquid outlet pipe 61 fixed thereon can move axially in the explosion-proof pipe 7 for nested fit, and at the same time, the main fire-fighting pipe 6 can be radially adjusted after the main fire-fighting pipe 6 is matched with the explosion-proof pipe 7 in place, so that the liquid outlet pipe 61 extends out of the mounting hole 71.

Referring to fig. 8, the mounting base further comprises an annular connecting plate 83 fixedly engaged with the outer tube wall of the liquid outlet tube 61, the axial direction of the connecting plate 83 is parallel to the axial direction of the liquid outlet tube 61, and the connecting plate 83 is fixedly engaged with the fixing plate 81.

When the fire fighting pipe 6 is used, the main fire fighting pipeline 6 is sleeved in the explosion-proof pipe 7, the liquid outlet pipe 61 is aligned to the mounting hole 71, then the mounting seat is clamped in the mounting hole 71, the fixing plate 81 can be fixedly connected with the explosion-proof pipe 7 through welding or screwing, and the connecting plate 83 can also be fixedly connected with the liquid outlet pipe 61 through welding or screwing, but only one end close to the converter transformer can be welded during welding and fixing, preferably, bolts (not shown) are used for radially connecting the liquid outlet pipe 61 and the connecting plate 83 in the liquid outlet pipe 61, the end parts of the bolts can be hidden under the pipe wall of the liquid outlet pipe 61, and the bolts can be fixed by using tools such as sleeves and wre; this allows for multiple positions to be fixed axially.

When the fixing plate 81 and the connecting plate 83 are perpendicular to each other, and the fixing plate 81 and the connecting plate 83 are directly connected, the shower head 5 is the same as that shown in fig. 6 and 7, and the fitting state of the drain pipe 61 and the mounting base after mounting is substantially the same as that shown in fig. 6 and 7.

In this embodiment, a second transition plate 84 is further provided to connect the fixing plate 81 and the connecting plate 83, the second transition plate 84 is obliquely arranged toward the inside of the explosion-proof pipe 7, at this time, one surface of the release circular truncated cone 52 connected with the fixing pipe 53 is obliquely arranged on the second transition plate 84 to be adapted and matched, after the fixing is completed, besides the spring gasket, the fixing effect of the spray head 5 on the spray head 5 can be improved by wrapping the spray head 5 by the second transition plate 84, and the spray head 5 is protected.

Referring to fig. 9, the present embodiment further provides a multimedia combination fire fighting system using the multimedia mixing apparatus, including an alarm system communicatively connected to the compressed air foam generating apparatus 41 and the high pressure gas generating apparatus 31, the alarm system communicatively connected to a fire detector, when the fire detector detects that open fire exists, the alarm system controls the compressed air foam generating device 41 and the high-pressure gas generating device 31 to work simultaneously, mixed fire-fighting medium is used for extinguishing fire, when the open fire is extinguished, namely, when the fire monitor signal changes from the existence of open fire to the nonexistence of open fire, the alarm system closes the high-pressure gas generating device 31, only the compressed air foam generating device 41 is used for spraying compressed air foam to prevent flame from reigniting, and the compressed air foam generating device 41 is set to be closed after working for a period of time to stop working or is manually closed by an operator. The fire detector can be purchased directly, and can use a point type ultraviolet flame detector, a point type infrared flame detector and the like, and the embodiment uses a dual-wavelength red and ultraviolet composite flame detector of a type of a foil wave A710/UVIR 2.

Based on above fire extinguishing system, the fire-fighting medium that this application can be used according to the different nimble changes of condition of a fire to the high-efficient safe fire control operation of carrying out has realized the linkage switching of dry powder and foam in accuse fire and the operation of putting out a fire.

Claims (10)

1. The utility model provides an extra-high voltage converter is multimedium mixing arrangement for transformer which characterized in that: including the compound venturi and the hybrid pipeline that connect gradually, compound venturi includes the inlayer venturi with dry powder pipeline intercommunication and the outer venturi with the foam pipeline intercommunication, and inlayer venturi nests in outer venturi, outer venturi and hybrid pipeline intercommunication, the export of inlayer venturi is in before outer venturi's the outer throat.

2. The multi-medium mixing device for the extra-high voltage converter transformer according to claim 1, wherein: the throat of the inner-layer Venturi tube and the throat of the outer-layer Venturi tube are both close to the respective outlets.

3. The multi-medium mixing device for the extra-high voltage converter transformer according to claim 1, wherein: and a vortex flow passage which is communicated along the axial direction is arranged in the mixing pipeline.

4. The multi-medium mixing device for the extra-high voltage converter transformer according to claim 3, wherein: four vortex flow passages are uniformly arranged on the mixing pipeline along the circumferential direction.

5. The multi-medium mixing device for the extra-high voltage converter transformer according to any one of claims 1-2, wherein: the dry powder pipeline comprises a high-pressure gas generating device and an ultrafine dry powder container which are sequentially communicated; the high-pressure gas generating device can provide high-speed airflow and supply the airflow to the superfine dry powder container through a gas pipeline, a flow speed regulating valve is arranged on the gas pipeline, a superfine dry powder adding pipeline is arranged on the superfine dry powder container, and a dry powder pipeline electronic valve is arranged between the superfine dry powder container and the composite Venturi tube.

6. The multi-medium mixing device for the extra-high voltage converter transformer according to claim 5, wherein: the foam pipeline comprises a compressed air foam generating device, and a compressed air foam pipeline electronic valve is arranged between the compressed air foam generating device and the composite Venturi tube.

7. The multi-medium mixing device for the extra-high voltage converter transformer according to claim 6, wherein: the dry powder pipeline electronic valve and the compressed air foam pipeline electronic valve can be operated remotely and manually.

8. The multi-medium mixing device for the extra-high voltage converter transformer according to claim 1, wherein: the outlet of the mixing pipeline is connected into a main fire-fighting pipeline, and a plurality of release nozzles are arranged on the main fire-fighting pipeline.

9. The multi-medium mixing device for the extra-high voltage converter transformer according to claim 8, wherein: the main fire fighting pipeline is nested in the explosion-proof pipe, the release nozzle is communicated with the main fire fighting pipeline and exposed on one side of the explosion-proof pipe facing the converter transformer, and the position where the release nozzle is connected with the main fire fighting pipeline is hidden in the explosion-proof pipe.

10. A fire fighting system using the multi-medium mixing device for the extra-high voltage converter transformer as recited in any one of claims 1 to 9, characterized in that: the inner-layer Venturi tube accelerates superfine dry powder through the high-pressure gas generating device, the outer-layer Venturi tube generates compressed air foam through the compressed air foam generating device, the fire fighting system comprises an alarm system in communication connection with the compressed air foam generating device and the high-pressure gas generating device, the alarm system is in communication connection with a fire detector, when the fire detector detects that open fire exists, the alarm system controls the compressed air foam generating device and the high-pressure gas generating device to work simultaneously, when the fire detector changes the signal from the existence of the open fire into the nonexistence of the open fire, the alarm system closes the high-pressure gas generating device, and the compressed air foam generating device keeps working.

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