CN217587081U - Fire-resistant reliability testing device for fire-fighting pipe network of convertor station - Google Patents

Abstract

The utility model provides a converter station fire-fighting pipe network fire-resistant reliability testing device, which comprises a burner, a pipe network, a water tank and a detection system; the combustor comprises a plurality of flame throwers and an air inlet main pipe; a plurality of flame throwers are fixed into a whole, and each flame thrower is communicated with the main air inlet pipe through the air inlet branch pipe; the first pressure gauge is fixed at the water inlet end of the water inlet main pipe, and the second pressure gauge is fixed at the blind end of the water inlet main pipe; the temperature detector sends a temperature signal to the controller, when the temperature reaches a set threshold and exceeds a set time, the controller controls the water inlet valve to be started, the water inlet valve is controlled to be closed after the water supply to the pipe network is carried out for a set time, and the controller judges the leakage condition of the pipe network according to the two water pressure differences and feeds back the leakage condition. The utility model discloses a great combustion area is realized to the combustor that comprises a plurality of flame thrower combinations, satisfies the high temperature cover to the pipe network, and the air supply volume that every flame thrower is adjusted to the accessible realizes the combination in different temperature areas, and real emulation conflagration scene satisfies the experiment demand.

Description

Fire-resistant reliability testing device for fire-fighting pipe network of convertor station

Technical Field

The utility model relates to a fire control pipe network detects technical field, is a current conversion station fire control pipe network fire-resistant reliability testing arrangement particularly.

Background

The extra-high voltage converter station is a station which is established in a high-voltage direct-current transmission system in order to finish the conversion of converting alternating current into direct current or converting direct current into alternating current and meet the requirements of a power system on safety, stability and power quality. A single oil immersed transformer with the capacity of 125MV & A or more and an oil immersed transformer (reactor) with the capacity of 200Mvar or more are arranged in the fire extinguishing system, and the water spraying fire extinguishing system is one of the most commonly used fire extinguishing systems of the extra-high voltage converter station in the practical engineering.

The fire extinguishing system is in good condition to realize the fire extinguishing capability, and the existing case of the converter transformer fire accident shows that the branch pipe and the spray head of the water spray fire extinguishing system are easy to be damaged in the fire, so that the pipe network loses the fire extinguishing capability. The damage of the branch pipe or the spray head of the water spray fire extinguishing system in the case of fire accident is once thought to be caused by the explosion of the converter transformer sleeve, and in the full-size true water spray fire extinguishing test of the national power grid company organization, the condition that the branch pipe and the spray head of the water spray fire extinguishing system are also damaged by flame combustion to cause the fire extinguishing failure of the pipeline is found.

After the test, the damage conditions of the branch pipe, the spray nozzle and the pipeline are partially changed into a sagging state directly from a standing state, part of the copper spray nozzle is melted, and the pipelines on the two sides are all broken at the clamp connection part, so that the test water spray fire extinguishing system can not form spray completely. This indicates that the water-mist fire suppression system is expected to function in practice, taking into account not only the anti-knock capability of the system, but also the burn-resistance of the water-mist fire suppression system.

The ultrahigh voltage converter station is provided with an oil immersed transformer (reactor) containing combustible fuel oil, when a fire disaster occurs, the flame is an explosive jet flame, and the temperature of a pipeline can be increased to 1200 ℃ or even 1400 ℃ within 20 seconds. The fire-fighting pipe under the general state is a metal pipe, the fire-fighting pipe under the conventional state is an empty pipe, after a fire disaster happens, early warning is firstly carried out, then checking is carried out, and finally water is delivered, the whole process is generally average for 3min, at the stage, the water delivery pipeline for fire fighting completely bears dry burning from a high-temperature fire source, the fire-fighting pipe can be already melted by the instantaneous high temperature of the explosion fire, or the fire-fighting pipe is heated to a very high temperature, even if the pipeline is not melted, when the water source is delivered, cold and heat are combined, the expansion and contraction caused by strong cooling and stress change are enough to burst the pipeline, the pipeline loses the function of delivering the water source, and the fire-fighting point is not timely provided with the water source for fire fighting. The actual scene also verifies the conjecture, and when the situation is found for many times in a real fire scene, the reliability of the fire fighting pipe in a high-temperature state is greatly reduced, and the fire fighting pipe does not have a problem in a fire protection system, but the fire fighting pipe cannot resist the flame.

At present, the fire-resistant experimental device for the pipe network generally adopts a point type fire source to carry out a combustion experiment on the pipe network. The point-type fire source has a small high-temperature area, and cannot simulate the real temperature area and the heating curve of a fire scene, so that experiments show that the pipeline meets the requirements, and the pipeline cannot withstand the actual tests in practical application.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve lies in the fire-resistant test system of fire-fighting pipe network of prior art's unable high simulation conflagration scene condition, leads to the test result inaccurate, can't guarantee that the fire pipeline can accord with the on-the-spot requirement.

The utility model discloses a following technical means realizes solving above-mentioned technical problem:

the fire-resistant reliability testing device for the fire-fighting pipe network of the convertor station comprises a combustor, a pipe network, a water tank (11) and a detection system;

the combustor comprises a plurality of torches (20) and an air inlet main pipe (21); a plurality of the torches (20) are fixed into a whole, and each torch (20) is communicated with a main air inlet pipe (21) through an air inlet branch pipe (22);

the pipe network comprises a main water inlet pipe (16), a branch water inlet pipe (19), a spray head (192) and a connecting piece; a plurality of water inlet main pipes (16) are connected end to end through the connecting pieces; one end of each of the water inlet branch pipes (19) is communicated with the main pipe, and the other end of each of the water inlet branch pipes is provided with the spray head (192); the heat radiation range of the burner covers a main water inlet pipe (16), a branch water inlet pipe (19), a connecting piece and a spray head (192);

the detection system comprises a temperature detector 181, a flowmeter (14), a first pressure gauge (15), a second pressure gauge (15'), a water inlet valve (12) and a controller; the temperature detectors (181) are arranged on the periphery of the pipe network; the flowmeter (14), the pressure gauge and the water inlet valve (12) are arranged on the water inlet main pipe (16); the temperature detector (181), the flowmeter (14) and the water inlet valve (12) are respectively in communication connection with the controller; one end of the main pipe is communicated with the water tank (11), and the other end of the main pipe is a blind end; the first pressure gauge (15) is fixed at the water inlet end of the water inlet main pipe (16), and the second pressure gauge (15') is fixed at the blind end of the water inlet main pipe (16); the temperature detector (181) sends a temperature signal to the controller, when the temperature reaches a set threshold and exceeds a set time, the controller controls the water inlet valve (12) to be started, and controls the water inlet valve (12) to be closed after the water is supplied to the pipe network for the set time; the first pressure gauge (15) and the second pressure gauge (15') respectively detect the water pressure of the water inlet end and the water pressure of the blind end of the water inlet main pipe (16), and the controller judges the leakage condition of the pipe network according to the two water pressure differences and feeds back the leakage condition.

The utility model provides a fire control pipe network fire resistance test system realizes great combustion area through the combustor that constitutes by a plurality of flame thrower combinations, satisfies the high temperature cover to the pipe network, and the equal independent air feed of every flame thrower, and the air supply volume that every flame thrower was adjusted to the accessible realizes the combination in different temperature regions, and true emulation conflagration scene satisfies the experiment demand. The combustor with a large combustion area can be used for simultaneously resisting fire corresponding to a main pipe, a branch pipe, a spray head and a connecting piece, a fire source or a pipe network does not need to be moved, and the experimental process is simple and efficient. The deformation and the leakage condition of the pipe network can be judged by calculating the pressure difference of the two pressure gauges, close-range observation of personnel is not needed, and the experiment risk is reduced.

Furthermore, 9 flame thrower (20) are a set of, form the flame projecting unit of 3 x 3 array, and air inlet branch pipe (22) are the field font, the field font central point of air inlet branch pipe (22) put with air inlet main pipe (21) intercommunication, 9 the air inlet of flame thrower (20) communicates with 9 nodes of air inlet branch pipe (22) field font respectively.

Further, a plurality of flame spraying units are arranged in an array mode to form the combustor.

Further, a plurality of the air inlet branch pipes (22) are fixed into a whole through a bracket.

Further, the flame thrower (20) comprises a cylinder (201), a connecting pipe (23), an air inlet and a nozzle; the cylinder (201) is of a structure with an open end and a closed end, a connecting pipe (23) penetrating through the inside and the outside of the cylinder (201) is fixed in the center of the closed end, one end, positioned outside the cylinder (201), of the connecting pipe (23) is fixedly communicated with the air inlet branch pipe (22), and one end, positioned inside the cylinder (201), of the connecting pipe is fixed with the nozzle (25); a plurality of air inlets are arranged at the closed end of the cylinder (201) around the connecting pipe (23).

Furthermore, the connecting pipe (23) is detachably fixed with the air inlet branch pipe (22).

Furthermore, the connecting pipe (23) is fixed with the air inlet branch pipe (22) in a threaded fit manner.

Further, the combustor also comprises a shell (26), wherein the shell (26) is a shell with the periphery enclosed and the top and the bottom plate open, and the plurality of flame sprayers (20) are fixed in the shell (26) through a support.

Furthermore, the bottom plate of the shell (26) is also provided with a support leg (28); the height of the supporting feet (28) is adjustable.

Furthermore, a metal net (29) is fixed on the top of the shell (26).

Further, the first pressure gauge (15) and the second pressure gauge (15') are located outside the combustion range of the burner.

Further, a water pump (13) is arranged on the water inlet main pipe which is positioned at the upstream of the first pressure gauge (15).

The utility model has the advantages that:

the utility model provides a fire control pipe network fire resistance test system realizes great combustion area through the combustor that constitutes by a plurality of flame thrower combinations, satisfies the high temperature cover to the pipe network, and the independent air feed of flame thrower, and the air supply capacity that every flame thrower was adjusted to the accessible realizes the combination in different temperature regions, and true emulation conflagration scene satisfies the experiment demand. The combustor with a large combustion area can be used for simultaneously resisting fire corresponding to a main pipe, a branch pipe, a spray head and a connecting piece, a fire source or a pipe network does not need to be moved, and the experimental process is simple and efficient. The deformation and the leakage condition of the pipe network can be judged by calculating the pressure difference of the two pressure meters, close-range observation of personnel is not needed, and the experiment risk is reduced.

The burners arranged in an array are adopted, so that the temperature of a combustion surface is uniform, and the controllability of the temperature regulation range is strong. The branch pipes are shaped like a Chinese character 'tian', gas is supplied from the middle of the Chinese character 'tian', and gas can be uniformly dispersed to 9 nodes of the Chinese character 'tian'. Each flaming unit supplies air independently, the high-low temperature area of the combustion surface can be adjusted by adjusting the air supply, the area range can be known, and the relation between the temperature and the deformation of the pipe network is easy to calculate.

The combustor passes through the shell and forms wholly to install the stabilizer blade of adjustable height, according to the experiment demand, through the height of adjusting the stabilizer blade, can satisfy the distance of pipe network and combustion face, the experimental range is wide.

Drawings

FIG. 1 is a schematic view of the overall structure of an experimental apparatus in an embodiment of the present invention;

FIG. 2 is a graph showing temperature contrast of an experimental apparatus in an embodiment of the present invention within 30 minutes according to a typical different temperature rise curve;

FIG. 3 is a table comparing temperature values of the experimental apparatus for the first 3 minutes of different temperature rise curves in the embodiment of the present invention;

FIG. 4 is a view of a partially enlarged installation structure of a test piece of the experimental apparatus according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a connector of the experimental apparatus according to an embodiment of the present invention;

FIG. 6 is a diagram of the arrangement and distribution of gas injection burners in the experimental apparatus according to the embodiment of the present invention;

FIG. 7 is a schematic diagram of an air supply line of a gas injection burner in an experimental apparatus according to an embodiment of the present invention;

FIG. 8 is a bottom structure view of a single torch in the experimental apparatus according to the embodiment of the present invention;

FIG. 9 is a top view of a single torch in the experimental apparatus according to an embodiment of the present invention;

FIG. 10 is a schematic view of a supporting leg structure of a burner in an experimental apparatus according to an embodiment of the present invention;

FIG. 11 is a view showing a structure of a burner housing in an experimental apparatus according to an embodiment of the present invention;

fig. 12 is a diagram illustrating an installation structure of a burner metal net in an experimental apparatus according to an embodiment of the present invention.

Detailed Description

To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are clearly and completely described below in combination with the technical solution of the embodiments of the present invention, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1 and 4: according to the fire-resistant reliability testing device for the fire-fighting pipe network of the convertor station, a water tank 11, a water inlet valve 12, a water pump 13, a first pressure gauge 15, a flowmeter 14 and a second pressure gauge 15' are sequentially connected onto a water inlet main pipe 16 in series according to the water supply direction, and the tail end of the water inlet main pipe 16 is sealed through a plug; the water inlet main pipe 16 is connected by a plurality of short pipes through a first connecting piece 161, the side wall of the water inlet main pipe 16 is connected with a plurality of water inlet branch pipes 19 in parallel, the water inlet branch pipes 19 are connected with the water inlet main pipe 16 through a second connecting piece 191, and the tail ends of the water inlet branch pipes 19 are connected with spray heads 192; the combustor 2 simulating the high-temperature fire source is arranged below the water inlet main pipe 16, and the test piece comprises the water inlet main pipe 16, a first connecting piece 161, a second connecting piece 191, a water inlet branch pipe 19 and a spray head 192; a temperature detector 181 is disposed around the main pipe 16, and in this embodiment, the temperature detector 181 is a thermocouple. The thermocouples are installed at different heights of the column 180, and the column is fixed at the periphery of the test area, so that the thermocouples at different heights can measure the temperatures of the test area at different heights, including the problems of the burner and the temperature of the environment where the test piece to be tested is located.

The first pressure gauge 15, the second pressure gauge 15', the flowmeter 14 and the temperature detector 181 are all in communication connection with the controller. The temperature detector sends a temperature signal to the controller, when the temperature reaches a set threshold and exceeds a set time, the controller controls the water inlet valve to be started, and controls the water inlet valve to be closed after the water is supplied to the pipe network for a set time; the first pressure gauge and the second pressure gauge respectively detect the water pressure of the water inlet end and the water pressure of the blind end of the water inlet main pipe, and the controller judges the leakage condition of the pipe network according to the two water pressure differences and feeds back the leakage condition.

In this embodiment, the horizontal height of the test piece from the burner 2 was 200mm, and the burner had a height of not less than 1m ² The combustion surface of (1).

The method for testing the fire-resistant reliability of the fire-fighting pipe network of the convertor station comprises the following steps:

(1) Before dry burning, all pipelines are subjected to tightness tests to ensure that each connecting part has no leakage, and after the tests are finished, water is drained;

(2) Starting a burner to dry the corresponding test piece, wherein the dry burning time is not less than 3min;

(3) The appearance performance of the test piece is recorded after 3min, then a water pump and a valve are started to generate water flow with the pressure not less than 0.4Mpa, the water flow is introduced for not less than 3min, and the bursting and leakage conditions of the test piece are recorded after water is introduced (the process can be obtained through manual observation and pressure difference calculation of a second pressure gauge of a first pressure gauge).

The main pipe, the first connecting piece, the second connecting piece, the branch pipe and the spray head are all detected test pieces, and the quality conditions of the main pipe, the connecting pieces and the spray head are mainly detected, whether requirements are met or not is judged, and the like. In the case of simulating a fire scene of the converter station, whether each test piece can tolerate high temperature in the scene or not is determined. Under the set high-temperature environment, the test that can withstand high-temperature conditions is qualified, and if the damage occurs, the test is not qualified. In this embodiment, as shown in fig. 5, the first connecting element and the second connecting element are both common connecting elements in a consumption pipe network, and are not described in detail herein.

The test is carried out on 32 groups of different test pieces, and the test result shows that:

1. even if the clamp connecting piece meets the regulation, the clamp connecting piece is not suitable for the harsher transformer oil fire scene.

2. Aiming at the characteristics of the fire disaster of the converter station, a test fire source is designed by utilizing the principle of a gas burner, and the actual possible heating condition can be better met by carrying out the test.

3. When the spraying thickness of the expansion type fireproof coating is less than 1.1mm, the expansion type fireproof coating is not obvious in foaming and is easy to fall off after water is introduced.

4. When the thickness of the non-fireproof coating or the fireproof coating is less than 1.5mm, the rubber gasket in the clamp connection mode is easy to be damaged by high temperature to cause serious water leakage, and an aluminum or copper spray head can be directly melted at high temperature to lose the spraying function.

5. When the thickness of the intumescent fire-retardant coating is not less than 2mm, the intumescent fire-retardant coating has good protection effect on pipelines, spray heads and joints and can bear 1200 ℃ high-temperature dry burning for at least 3 minutes.

6. The fireproof paint is directly sprayed on the pipeline finish paint, and no obvious influence on the foaming heat-insulating property of the fireproof material is found.

As shown in fig. 6 and 7: the burner 2 is a gas injection type burner and comprises a plurality of torches 20, wherein each torch 20 comprises a cylinder 201, a connecting pipe 23, an air inlet 24 and a nozzle 25; the cylinder 201 is of a structure with an open end and a closed end, a connecting pipe 23 penetrating through the inside and the outside of the cylinder 201 is fixed at the center of the closed end, one end of the connecting pipe 23 positioned outside the cylinder 201 is fixedly communicated with the air inlet branch pipe 22, and one end positioned inside the cylinder 201 is fixed with the nozzle 25; a plurality of air inlet holes 24 are opened at the closed end of the cylinder 201 around the connection pipe 23. In this embodiment, the connecting pipe is fixed with air inlet branch pipe screw-thread fit, convenient to detach. The air intake holes 24 are uniformly arranged around the connection pipe 23 in this embodiment.

As shown in fig. 8, the bore of the cylinder 201 is 10-15cm, the distance between the gas injection burners is 3-6cm, every nine gas injection burners 2 are in one group, a gas inlet branch pipe 22 is arranged below each group of gas injection burners 2, the gas inlet branch pipe 22 is shaped like a Chinese character tian, the center of one side of the gas inlet branch pipe 22 is communicated with a gas inlet main pipe 21, the communication position of the gas inlet main pipe and the gas inlet branch pipe is located at the central intersection of the Chinese character tian, and the other side of the gas inlet branch pipe 22 is respectively communicated with the center of the bottom of the gas injection burner 2; the gas injection burner is used for uniformly feeding gas which is combustion gas and can be coal gas, gas and the like, one gas feeding main pipe simultaneously supplies a group of gas injection burners, the connecting end of the gas feeding main pipe 21 is positioned in the center of the gas feeding branch pipe 22, simultaneously, the gas feeding to each gas injection burner is uniform, nine groups of gas injection burners are formed by the conventional arrangement mode of a plurality of groups of gas injection burners, and each group of nine gas injection burners is square after being combined.

As shown in fig. 1, in this embodiment, in order to enlarge the combustion area, 9 flame sprayers 20 are used as a group to form a 3 × 3 array of flame spraying units, an intake branch pipe 22 is shaped like a Chinese character 'tian', the central position of the Chinese character 'tian' shape of the intake branch pipe 22 is communicated with the intake main pipe 21, and the intake ports of the 9 flame sprayers are respectively communicated with 9 nodes of the Chinese character 'tian' shape of the intake branch pipe. A plurality of the flaming units are arrayed to form the burner 2. And the plurality of air inlet branch pipes are fixed into a whole through a bracket.

The utility model discloses in, the upside of flame thrower 20 is the bocca, and the downside is the connecting pipe intercommunication for admit air. It should be noted that: the bottom of the flame thrower 20 is used for admitting air except that the communicating connecting pipe, a plurality of air holes are arranged at the same time, the air is used for entering, the effect of premixed combustion is generated, the entering gas enters the flame thrower 20 and is premixed with the air entering from the air holes, then the gas is ignited and is sprayed out under the pressure action of the gas, the internal combustion gas of the air inlet main pipe has a certain pressure value, the gas sprayed from the connecting pipe has a certain initial speed, the stable temperature reaches 1200-1300 ℃ when the gas is sprayed out of the bottom of the flame thrower 20, the negative pressure action is generated together with the flame thrower 20, the air is actively sucked through the air holes and is premixed with the combustion gas, and high-temperature and stable flame is generated instantly, the characteristic that the transformer explodes to fire under the natural condition in the actual process is simulated, and the effective fire resistance test is performed on the fire extinguishing pipeline at the part of the position.

In this embodiment, the burner 2 is composed of a plurality of torches 20, and each torch 20 is supplied with air independently. During the actual experiment, can realize different temperature region changes through the air supply volume of adjusting a plurality of flame throwers 20 according to on-the-spot high temperature demand, and the intensification curve, demonstrate different conflagration scenes, adjust randomness strong, satisfy the fire-resistant experimental demand of pipe network of different requirements.

Here, there is a gap between the torch 20 and the torch 20 for air supplement from bottom to top during combustion, providing a sufficient amount of oxygen.

As shown in fig. 8: the flame thrower 20 is detachably mounted to the intake manifold 22. The flame thrower 20 is convenient to mount and dismount, and replacement is facilitated.

As shown in fig. 8: the connection pipe 23 is screwed with the intake manifold 22. The torch 20 can be easily removed by rotating the torch 20, and the threaded connection is sleeved.

As shown in fig. 8: the connecting pipe 23 is provided with a nozzle 25 corresponding to the position of the flame thrower 202, and the nozzle 25 is conical. Used for improving the pressure when the fuel gas is sprayed out.

As shown in fig. 10: the device comprises a shell 26 arranged outside, and the bottom of the shell 26 is hollowed out correspondingly. The shell is used for playing the guard action, and the bottom fretwork is used for gas exchange, and the shell is square.

As shown in fig. 9: a bracket 27 is provided between the housing 26 and the intake manifold 22. For supporting the torch 20 to prevent heat transfer and to prevent workers from being scalded.

As shown in fig. 9 and 10: the bottom of the housing 26 is provided with feet 28, the feet 28 being provided with threaded rods 281 of a threadably telescopic height. The device is used for adjusting the height of the whole device, the temperature of the flame is divided into inner flame and outer flame, the temperature is distinguished by grades, and the whole device is properly lifted to enable the test pipeline to be in the optimal test position.

As shown in fig. 11: the upper side of the shell 26 is provided with a detachable metal mesh 29. The metal mesh can make the air current more stable, and the burning is more stable, also prevents simultaneously that the thing that burns and melt from down falling.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims (12)

1. The device for testing the fire-resistant reliability of the fire-fighting pipe network of the convertor station is characterized by comprising a combustor, a pipe network, a water tank (11) and a detection system;

the combustor comprises a plurality of flame sprayers (20) and an air inlet main pipe (21); a plurality of the flame sprayers (20) are fixed into a whole, and each flame sprayer (20) is communicated with the main air inlet pipe (21) through the air inlet branch pipe (22);

the pipe network comprises a main water inlet pipe (16), a branch water inlet pipe (19), a spray head (192) and a connecting piece; a plurality of water inlet main pipes (16) are connected end to end through the connecting pieces; one end of each of the water inlet branch pipes (19) is communicated with the main pipe, and the other end of each of the water inlet branch pipes is provided with the spray head (192); the heat radiation range of the burner covers a main water inlet pipe (16), a branch water inlet pipe (19), a connecting piece and a spray head (192);

the detection system comprises a temperature detector (181), a flowmeter (14), a first pressure gauge (15), a second pressure gauge (15'), a water inlet valve (12) and a controller; the temperature detector (181) is arranged on the periphery of the pipe network; the flowmeter (14), the pressure gauge and the water inlet valve (12) are arranged on the water inlet main pipe (16); the temperature detector (181), the flowmeter (14) and the water inlet valve (12) are respectively in communication connection with the controller; one end of the main pipe is communicated with the water tank (11), and the other end of the main pipe is a blind end; the first pressure gauge (15) is fixed at the water inlet end of the water inlet main pipe (16), and the second pressure gauge (15') is fixed at the blind end of the water inlet main pipe (16); the temperature detector (181) sends a temperature signal to the controller, when the temperature reaches a set threshold and exceeds a set time, the controller controls the water inlet valve (12) to be started, and controls the water inlet valve (12) to be closed after the water is supplied to the pipe network for the set time; the first pressure gauge (15) and the second pressure gauge (15') respectively detect the water pressure of the water inlet end and the water pressure of the blind end of the water inlet main pipe (16), and the controller judges the leakage condition of the pipe network according to the two water pressure differences and feeds back the leakage condition.

2. The fire-resistant reliability testing device for the fire-fighting pipe network of the convertor station as claimed in claim 1, wherein 9 flame sprayers (20) are grouped to form a 3 x 3 array of flame spraying units, the air inlet branch pipes (22) are shaped like a Chinese character tian, the central positions of the Chinese character tian-shaped air inlet branch pipes (22) are communicated with the air inlet main pipe (21), and the air inlets of the 9 flame sprayers (20) are respectively communicated with 9 nodes of the Chinese character tian-shaped air inlet branch pipes (22).

3. The converter station fire pipe network fire-resistant reliability testing device of claim 2, wherein a plurality of the flaming units are arrayed to form the burner.

4. The fire-resistant reliability testing device for the fire-fighting pipe network of the convertor station as claimed in claim 3, wherein the plurality of air inlet branch pipes (22) are fixed into a whole through a bracket.

5. The fire-resistant reliability testing device for the fire-fighting pipe network of the convertor station as claimed in any one of claims 1 to 4, wherein the flame thrower (20) comprises a barrel (201), a connecting pipe (23), an air inlet, and a nozzle; the cylinder (201) is of a structure with an open end and a closed end, a connecting pipe (23) penetrating through the inside and the outside of the cylinder (201) is fixed in the center of the closed end, one end, positioned outside the cylinder (201), of the connecting pipe (23) is fixedly communicated with the air inlet branch pipe (22), and one end, positioned inside the cylinder (201), of the connecting pipe is fixed with the nozzle (25); a plurality of air inlets are arranged at the closed end of the cylinder (201) around the connecting pipe (23).

6. The fire-resistant reliability testing device for the fire-fighting pipe network of the convertor station as claimed in claim 5, wherein the connecting pipe (23) is detachably fixed with the air inlet branch pipe (22).

7. The fire-resistant reliability testing device for the fire-fighting pipe network of the convertor station as claimed in claim 6, wherein the connecting pipe (23) is fixed with the air inlet branch pipe (22) in a threaded fit manner.

8. The fire-resistant reliability testing device of the fire-fighting pipe network of the converter station according to claim 5, characterized in that the combustor further comprises a housing (26), the housing (26) is a shell with a surrounding and an open top and a bottom, and the plurality of torches (20) are fixed in the housing (26) through supports.

9. The fire-resistant reliability testing device for the fire-fighting pipe network of the converter station according to claim 8, characterized in that a support leg (28) is further arranged on the bottom plate of the housing (26); the height of the supporting feet (28) is adjustable.

10. The fire-resistant reliability testing device for the fire-fighting pipe network of the converter station according to claim 8, characterized in that a metal mesh (29) is further fixed on the top of the housing (26).

11. The fire-resistant reliability testing device of the fire-fighting pipe network of the converter station according to claim 1, characterized in that the first pressure gauge (15) and the second pressure gauge (15') are located outside the combustion range of the burner.

12. The fire-resistant reliability testing device for the fire-fighting pipe network of the convertor station as claimed in claim 1, wherein a water pump (13) is further installed on the main water inlet pipe located at the upstream of the first pressure gauge (15).

Images