CN211215084U - Two-stage mixing type foam proportion mixing system of oil-immersed transformer foam spraying system - Google Patents
Two-stage mixing type foam proportion mixing system of oil-immersed transformer foam spraying system Download PDFInfo
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- CN211215084U CN211215084U CN201921341972.1U CN201921341972U CN211215084U CN 211215084 U CN211215084 U CN 211215084U CN 201921341972 U CN201921341972 U CN 201921341972U CN 211215084 U CN211215084 U CN 211215084U
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Abstract
The utility model discloses a two-stage hybrid foam proportion mixing system of oil-immersed transformer foam spraying system, including foam mixer, foam liquid case, fire water tank and fire pump, the delivery port of fire water tank communicates with the inlet of fire pump through the first pipeline, and the liquid outlet of fire pump communicates second pipeline and third pipeline simultaneously, and wherein the second pipeline is used for communicating the major network of system, and the third pipeline communicates the inlet of foam mixer, and the material suction mouth of foam mixer communicates with the foam liquid case through the fourth pipeline, and the discharge gate of foam mixer communicates with the first pipeline; the liquid pressure in the second line is higher than the liquid pressure in the third line. The utility model discloses can reduce because of the too big loss of pressure that the blender caused, can improve the stability of system's mixing ratio, can make the foam stoste in the pipeline and water intensive mixing.
Description
Technical Field
The utility model relates to an oil-immersed transformer foam water-spraying system's two-stage hybrid foam proportion hybrid system belongs to public safety-fire control technique.
Background
In areas with relative water shortage or in the occasions where building fire-fighting water pools and pump rooms are not economical, the foam mixed liquid of the foam spraying system of the oil-immersed transformer is provided in two main ways: the premix type and the field hybrid type are more commonly used because the field hybrid type is more scalable than the premix type.
Foam mixes of the in situ mix type are typically prepared using an in-line foam proportioner, which has the following problems: (1) in order to work normally, the pipeline foam proportioner must fully convert potential energy and kinetic energy, and the conversion of the energy causes great pressure loss (generally more than 35 percent), thereby reducing the load capacity of the fire pump; (2) the change of the system pipe network or the tail end injection equipment can cause the change of the back pressure of the mixer, the change of the back pressure can have obvious influence on the vacuum degree of the foam suction inlet of the mixer, the foam stock solution enters the mixer under the combined action of the atmospheric pressure and the vacuum condition, the atmospheric pressure can be set to be constant, and then the change of the vacuum degree can directly determine the suction amount of the foam stock solution, namely directly influence the mixing ratio of the system, and the mixing ratio of the system is an important influence factor of the relevant performance of the foam system; (3) in order to reduce the on-way pressure loss of a system pipe network, the flow velocity of fluid in the pipeline is generally not large, the stirring of injected foam stock solution by water is insufficient, so that the mixing between the foam stock solution and the water is insufficient, the insufficiently-mixed liquid is not beneficial to foam foaming, the formed foam is also unstable and the like, and finally the influence is caused on the fire extinguishing performance of the system.
SUMMERY OF THE UTILITY MODEL
The purpose of the invention is as follows: in order to overcome the not enough of existence among the prior art, the utility model provides an oil-immersed transformer foam spraying system's two-stage hybrid foam proportion hybrid system can reduce because of the too big loss of pressure that the blender caused, can improve the stability of system mixing ratio, can make foam stoste and the water intensive mixing in the pipeline.
The technical scheme is as follows: in order to achieve the above object, the utility model adopts the following technical scheme:
a two-stage mixing type foam proportion mixing system of an oil immersed transformer foam spraying system comprises a foam mixer, a foam liquid tank, a fire water tank and a fire pump, wherein a water outlet of the fire water tank is communicated with a liquid inlet of the fire pump through a first pipeline, a liquid outlet of the fire pump is simultaneously communicated with a second pipeline and a third pipeline, the second pipeline is used for being communicated with a system main network, the third pipeline is communicated with a liquid inlet of the foam mixer, a material suction port of the foam mixer is communicated with the foam liquid tank through a fourth pipeline, and a material discharge port of the foam mixer is communicated with the first pipeline; the liquid pressure in the second line is higher than the liquid pressure in the third line.
In the scheme, liquid output by the fire pump is divided into two paths with different sizes according to a certain flow proportion, the path with the large flow directly moves forwards along a main network of the system, and the path with the small flow passes through a bypass of a foam mixer and then flows back to a liquid inlet of the fire pump; knowing that the pressure of the water outlet of the fire pump is higher than the pressure of the water inlet, the pressure of the third pipeline (the pressure of the second pipeline is the same as that of the third pipeline) is higher than that of the first pipeline necessarily, that is, knowing that the pressure of the liquid inlet of the foam mixer is higher than that of the material outlet of the foam mixer, the liquid can be flushed into the first pipeline through the bypass of the foam mixer, in the process, the foam stock solution in the foam tank (the internal pressure of the foam tank is different according to the structural design of the foam tank and is generally in an unclosed structure, the internal pressure of the foam tank is normal atmospheric pressure and is necessarily lower than that of the third pipeline) communicated with the bypass is sucked into the foam mixer, the foam stock solution and the liquid in the bypass are mixed to form a primary foam mixed solution, the mixed solution is far larger than the required system mixed solution, and the primary foam mixed solution can enter the fire pump again, after the fire pump is vigorously stirred, the secondary foam mixed liquid is fully mixed to form secondary foam mixed liquid (which is beneficial to the stability of foaming and foaming foam and the improvement of fire extinguishing efficiency), the mixing ratio at the moment meets the requirement of the mixing ratio of the system, and then the main network of the system at the downstream of the fire pump always conveys the secondary foam mixed liquid to a protection area to extinguish the foam.
The scheme is characterized in that a foam mixer causing larger system pressure loss is arranged beside the foam mixer, only a small part of water flow has obvious pressure loss, and the total pressure loss of the system is obviously reduced. The working condition of the foam mixer is not influenced or is slightly influenced by the system pipe network and the spraying equipment at the tail end of the system, the back pressure is constant, and the mixing ratio (namely, the first-stage mixing ratio) of the foam mixer is constant. The system mixing ratio (i.e., the secondary mixing ratio) will remain relatively constant when there is a slight change in the operating flow or operating back pressure of the system. The scheme also effectively utilizes the stirring effect of the fire pump impeller to ensure the uniform mixing of water and foam.
In the process of multiple tests of our, such as making certain adjustment to the running length of the system pipeline and adding one or more spray heads to the system, the finally measured change amount of the system mixing ratio (namely the secondary mixing ratio) is generally not more than 10%. For example, the system mixing ratio is required to be 3%, the allowable system mixing ratio ranges from 3% to 3.9%, and the actual system mixing ratio is 3.5% at the beginning: when the system flow is increased by 10%, the system mixing ratio becomes 3.3%; when the system flow rate was reduced by 10%, the system mix ratio became 3.9%.
Preferably, be provided with check valve and filter on the first pipeline, prevent through the check valve that liquid refluences to the fire water tank in, reduce the damage of fire pump through the filter. An isolation valve is arranged on the third pipeline, and the on-off of the bypass of the foam mixer can be controlled through the isolation valve: when the isolation valve is closed, the bypass of the foam mixer is closed, the foam liquid tank does not provide foam stock solution for the system any more, and the system can only provide water source; when the isolation valve is opened, the foam mixer bypass is opened, the foam liquid tank provides foam stock solution for the system, and the system provides foam mixed liquid required by the mixing ratio of the system. And a check valve is arranged on the fourth pipeline, and the foam stock solution or the liquid in the foam mixer is prevented from flowing back to the foam solution tank through the check valve.
Preferably, the discharge port of the foam mixer is communicated with a pipeline between the check valve and the filter on the first pipeline, and the filter is positioned between the check valve and the fire pump; all liquid entering the fire pump is filtered, and any liquid cannot flow back into the fire water tank.
Preferably, the foam mixer includes the one-level hybrid chamber, and the one-level hybrid chamber passes through the inlet intercommunication of bypass and foam mixer, and the one-level hybrid chamber communicates with the discharge gate of inhaling material mouth and foam mixer of foam mixer simultaneously.
Specifically, the system mixing ratio of the two-stage mixing type foam proportional mixing system is adjusted by adjusting the flow ratio of the second pipeline and the third pipeline. When the system works normally, the pressure difference between the two ends of the fire pump is stable, and the change can be ignored; therefore, the larger the flow ratio between the second line and the third line, the larger the amount of foam raw liquid sucked and the higher the system mixing ratio, and the correspondence between the flow ratio and the system mixing ratio can be learned by a learning method such as a neural network.
Has the advantages that: the utility model provides an oil-immersed transformer foam spraying system's two-stage hybrid foam proportioner, relative and prior art, have following advantage: 1. the excessive pressure loss caused by the mixer can be reduced, so that the fire extinguishing system has longer conveying distance; 2. the stability of the mixing ratio of the system can be improved, and the design index of the continuous supply time of the system is indirectly ensured; 3. the foam stock solution in the pipeline can be fully mixed with water to form foam mixed solution which is uniformly mixed, so that the foam mixing liquid is favorable for the stability of foaming and foaming foam and the improvement of fire extinguishing efficiency.
Drawings
Fig. 1 is a schematic structural view of the present invention;
the figure includes: 1-a first pipeline; 2-a second pipeline; 3-a third pipeline; 4-fourth pipeline.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
Fig. 1 shows a two-stage hybrid foam proportioner of a foam spraying system of an oil-immersed transformer, which comprises a foam mixer, a foam liquid tank, a fire water tank and a fire pump, wherein a water outlet of the fire water tank is communicated with a liquid inlet of the fire pump through a first pipeline 1, a liquid outlet of the fire pump is simultaneously communicated with a second pipeline 2 and a third pipeline 3, the second pipeline 2 is used for communicating a main network of the system, the third pipeline 3 is communicated with a liquid inlet of the foam mixer, a suction port of the foam mixer is communicated with the foam liquid tank through a fourth pipeline 4, and a discharge port of the foam mixer is communicated with the first pipeline 1; the liquid pressure in the second line 2 is higher than the liquid pressure in the third line 3.
A check valve and a filter are arranged on the first pipeline 1, an isolation valve is arranged on the third pipeline 3, and a check valve is arranged on the fourth pipeline 4; the discharge gate of foam mixer and first pipeline 1 go up the pipeline intercommunication between check valve and the filter, and the filter is located between check valve and the fire pump.
The above description is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.
Claims (5)
1. The utility model provides an oil-immersed transformer foam spraying system's two-stage hybrid foam proportion hybrid system which characterized in that: the fire-fighting water tank is communicated with a liquid inlet of the fire-fighting pump through a first pipeline, a liquid outlet of the fire-fighting pump is simultaneously communicated with a second pipeline and a third pipeline, the second pipeline is used for being communicated with a main network of the system, the third pipeline is communicated with the liquid inlet of the foam mixer, a suction port of the foam mixer is communicated with the foam liquid tank through a fourth pipeline, and a discharge port of the foam mixer is communicated with the first pipeline; the liquid pressure in the second line is higher than the liquid pressure in the third line.
2. The two-stage hybrid foam proportioning system of an oil transformer foam misting system of claim 1, wherein: be provided with check valve and filter on the first pipeline, be provided with the isolating valve on the third pipeline, be provided with the check valve on the fourth pipeline.
3. The two-stage hybrid foam proportioning system of the oil transformer foam spraying system of claim 2, wherein: the discharge gate of foam mixer and the pipeline intercommunication between stop-return valve and the filter on the first pipeline, and the filter is located between check valve and the fire pump.
4. The two-stage hybrid foam proportioning system of an oil transformer foam misting system of claim 1, wherein: the foam mixer comprises a first-stage mixing cavity, the first-stage mixing cavity is communicated with a liquid inlet of the foam mixer through a bypass, and the first-stage mixing cavity is communicated with a material suction port of the foam mixer and a material discharge port of the foam mixer.
5. The two-stage hybrid foam proportioning system of an oil transformer foam misting system of claim 1, wherein: and the system mixing ratio of the two-stage mixing type foam proportional mixing system is adjusted by adjusting the flow ratio of the second pipeline and the third pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921341972.1U CN211215084U (en) | 2019-08-16 | 2019-08-16 | Two-stage mixing type foam proportion mixing system of oil-immersed transformer foam spraying system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921341972.1U CN211215084U (en) | 2019-08-16 | 2019-08-16 | Two-stage mixing type foam proportion mixing system of oil-immersed transformer foam spraying system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110523029A (en) * | 2019-08-16 | 2019-12-03 | 国网江苏省电力有限公司 | The hybrid foam proportioning system of two-stage of oil-immersed transformer foam spray system |
| CN112807597A (en) * | 2020-12-29 | 2021-05-18 | 国网江苏省电力有限公司 | Converter transformer fire foam-water mist fire extinguishing experimental system |
-
2019
- 2019-08-16 CN CN201921341972.1U patent/CN211215084U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110523029A (en) * | 2019-08-16 | 2019-12-03 | 国网江苏省电力有限公司 | The hybrid foam proportioning system of two-stage of oil-immersed transformer foam spray system |
| CN112807597A (en) * | 2020-12-29 | 2021-05-18 | 国网江苏省电力有限公司 | Converter transformer fire foam-water mist fire extinguishing experimental system |
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