CN108671448A - It is a kind of to gather liquid-supplying system and operating method for fire fighting truck - Google Patents

Abstract

The invention discloses an accumulating liquid supply system for a fire engine, which includes a water supply vehicle, a branch circuit, an accumulation pipeline, a controller and a main pipeline; there are multiple water supply vehicles, and the water supply vehicles are connected in parallel through the corresponding branch circuits It is connected with the accumulation pipeline; there are electric regulating valves, pressure transmitters and check valves on the branch road; The flow meter, the vehicle centrifugal pump and the fire monitor; the controller is respectively connected with the electric control valve, the pressure transmitter, the pressure reducing and stabilizing valve, the fifth pressure transmitter and the electromagnetic flow meter. The invention can ensure the continuous and stable water consumption of the on-board pump of the fire truck, meet various water demands according to the size of the fire scene, and is especially suitable for large flow and high pressure occasions required in large-scale fires. The present invention makes full use of the pressure provided by the water supply vehicle to counteract a part of the power of the fire truck's vehicle-mounted pump, thereby saving energy.

Description

An accumulating liquid supply system for fire trucks and its operating method

technical field

The invention relates to the field of fire-fighting water supply systems, in particular to an accumulation liquid-supply system and an operation method of a fire truck vehicle-mounted pump.

Background technique

With the rapid development of large-scale cities in our country, population agglomeration, living quarters and high-rise buildings are increasing, urban fire protection has ushered in new challenges. At present, urban fire trucks are facing problems such as high floors and narrow roads. The water supply form of the vehicle fire protection system is single and the water supply capacity is poor. Requirements for continuity and stability of liquid supply.

In the existing water supply technology, a plurality of water supply trucks supply water to a fire truck through a simple storage tank, that is, the water supply truck supplies water to the simple storage tank, and the fire truck's on-board pump absorbs the water in the simple storage tank to put out the fire. However, the existing technology is inconvenient to operate, and the capacity of the simple water storage tank is limited. It takes a certain amount of time to fill the water storage tank, wasting precious rescue time, and there is no way to use the water pressure of the water supply truck, resulting in a certain waste of pressure.

Contents of the invention

Based on the problems existing in the background technology, the present invention proposes an accumulation liquid supply system for a fire truck on-board pump, which is used in the working condition of multiple water supply trucks supplying water to one fire truck on-board pump, ensuring the stability and continuity of the pressure and flow of water supply .

The present invention proposes an accumulation liquid supply system for fire trucks, including water supply vehicles, branch roads, accumulation pipelines, controllers and main pipelines; there are multiple water supply vehicles, and the water supply vehicles adopt a parallel connection through corresponding branch roads It is connected with the accumulation pipeline; there are electric regulating valves, pressure transmitters and check valves on the branch road; the accumulation pipeline is to collect multiple channels of water into one channel of water, with various structures, according to the fluid impact during the process of multi-pump parallel connection Regularity, choose a simple detachable modular structure, and at the same time the diameter of the converging pipeline is much larger than the diameter of the branch; Flow meter, on-board centrifugal pump and fire monitor; the controller is respectively connected with electric regulating valve, pressure transmitter, pressure reducing and stabilizing valve, fifth pressure transmitter and electromagnetic flowmeter;

The electric regulating valve can adjust the valve opening according to the input signal; the electromagnetic flowmeter and pressure transmitter can output pressure and flow signals; the pressure at the outlet of the pressure reducing and stabilizing valve is constant and will not change due to the change of the inlet pressure and flow , the outlet pressure can be adjusted within a certain range;

The main function of the controller is to compare the flow and pressure of the branch circuit with the flow and pressure of the main circuit, and control the opening of the electric regulating valve according to the comparison result; Input the outlet pressure value on the panel, and the pressure reducing and stabilizing valve will be automatically adjusted.

As an improvement, the controller adopts PID controller.

As an improvement, the pressure reducing and stabilizing valve is provided with a pilot valve, and the controller is connected with the pilot valve through an electromagnetic control device.

The present invention also provides an operation method of the accumulation liquid supply system, comprising the following steps:

a. Keep the opening of the electric control valve at the minimum, and turn on the fire pumps of the water supply trucks in turn;

b. The controller adjusts the opening of the electric control valve according to the value of the branch pressure transmitter, and keeps the pressure difference in the branch small under the premise of ensuring the flow rate;

c. At the same time, the controller automatically adjusts the set pressure value according to the values of the pressure transmitter on the branch line and the fifth pressure transmitter on the main line, so that the pressure difference between the front and rear of the pressure reducing and stabilizing valve is within a certain range without causing Large flow loss;

d. When the flow of the main pipeline is insufficient, the controller increases the opening of the electric regulating valve to reduce the pressure difference of the pressure reducing and stabilizing valve to increase the flow of the main pipeline. When the flow of the main pipeline is too large, the controller reversely operates the electric Regulating valve and pressure reducing and stabilizing valve;

e. When the water storage of the water supply truck is about to be exhausted, the pressure in the branch circuit decreases, the controller controls the opening of the electric regulating valve on the branch circuit to decrease until it is closed, and controls the opening degree of the electric regulating valve on the other branch circuits to increase and open synchronously Water supply truck, so that the water supply truck and the water supply truck can be switched synchronously;

f. The controller performs steps b, c and d.

In the present invention, firstly, the electric control valves of each branch are opened to a minimum opening degree; then, according to the pressure and flow rate on the converging main road, the opening degree of the electric regulating valve is controlled by the controller, and then the pressure and flow rate on the converging main road are adjusted; When the water volume of a certain water supply truck is close to the bottom limit, the flow and pressure on the branch road will gradually decrease. In order to ensure the flow on the convergent main road, a new water supply truck needs to be added at this time to ensure the pressure and flow of the main pipe. During the switching process of the water supply vehicle, in order to ensure the flow stability of the main pipeline, the opening of the electric control valve can be further opened, and the valve of the newly added branch circuit of the water supply vehicle can be opened synchronously to fill the water supply vehicle that is about to be exhausted. the amount of water provided;

Beneficial effects: The present invention provides an accumulation liquid supply system for fire trucks, which can ensure the continuous and stable water consumption of the fire truck's on-board pumps, and can meet various water needs according to the size of the fire scene, and is especially suitable for large-scale fires. Large flow, high pressure occasions. Compared with the existing technical solutions, it occupies a small area, does not require preparation time, and can be put into use in real time, prolonging the rescue time; at the same time, the pressure provided by the water supply truck is fully utilized to offset part of the power of the fire truck's on-board pump, saving energy.

Description of drawings

Fig. 1 is a structural representation of the present invention;

In the figure: A1, the first water supply vehicle, A2, the second water supply vehicle, A3, the third water supply vehicle, A4, the fourth water supply vehicle, B1, the first branch, B2, the second branch, B3, the third branch Road, B4, the fourth branch, C1, the first electric control valve, C2, the second electric control valve, C3, the third electric control valve, C4, the fourth electric control valve, D1, the first pressure transmitter, D2, the second pressure transmitter, D3, the third pressure transmitter, D4, the fourth pressure transmitter, E1, the first check valve, E2, the second check valve, E3, the third check valve , E4, the fourth check valve, 4, the accumulation pipeline, 5, the pressure reducing and stabilizing valve, 6, the fifth pressure transmitter, 7, the electromagnetic flowmeter, 8, the vehicle centrifugal pump, 9, the fire monitor, 10 , controller, 11, the main road.

Detailed ways

Now take the water supply vehicle A of the same type and model as an example, the performance of each water supply vehicle A is rated flow rate 15L/s, rated pressure 1MPa, and the rated flow rate of the on-board centrifugal pump 8 of the fire truck is 40L/s, rated pressure 2.5MPa .

As shown in Figure 1, the system proposed by the present invention for fire truck accumulation and supply includes four water supply trucks (A1, A2, A3, A4), four branches (B1, B2, B3, B4), the accumulation Pipeline 4, controller 10 and main pipe 11; four water supply trucks (A1, A2, A3, A4) are connected to the accumulation pipeline 4 in parallel through corresponding branches (B1, B2, B3, B4); Four electric regulating valves (C1, C2, C3, C4), four pressure transmitters (D1, D2, D3, D4) and four Check valves (E1, E2, E3, E4); the accumulation pipeline 4 is connected to the main pipeline 11, and the main pipeline 11 is sequentially provided with a pressure reducing and stabilizing valve 5, a fifth pressure transmitter 6, and an electromagnetic flowmeter 7. Vehicle-mounted centrifugal pump 8 and fire monitor 9; controller 10 adopts PID controller, and controller 10 is respectively connected with electric control valve (C 1, C2, C3, C4), pressure transmitter (D1, D2, D3, D4) ), the fifth pressure transmitter 6 and the electromagnetic flowmeter 7 are connected; the pressure reducing and stabilizing valve 5 is provided with a pilot valve, and the controller 10 is connected with the pilot valve through an electromagnetic control device.

In this embodiment, the water supply trucks (A1, A2, A3) normally start up and supply water to meet the water consumption of the on-board centrifugal pump 8 of the fire truck; When one set of water was exhausted, the water supply truck A4 was used to replace the water supply to ensure the water consumption of the on-board pump 8 of the fire truck.

The specific process is as follows: keep the opening of the electric regulating valve C at the minimum, turn on the fire pumps of the water supply trucks in turn, and the check valve E is used to prevent the water from flowing back to the branch B of the fire pumps of the water supply trucks that are opened later; The pressure water is delivered to the accumulation pipeline 4, and the incoming water from different branches B in the accumulation pipeline 4 reaches the inlet of the pressure reducing and stabilizing valve 5 after converging; through the outlet of the pressure reducing and stabilizing valve 5, the fifth pressure variable Water transmitter 6 and electromagnetic flowmeter 7 measure the pressure and flow of water for feedback to the controller 10; then it reaches the entrance of the on-board pump 8 of the fire truck, and is pumped by the on-board centrifugal pump 8 into the fire monitor 9 to spray out the fire.

In this embodiment, due to the different lengths of the hoses in the branch B and the different pipelines in the water supply truck A, resulting in different liquid resistance, it is necessary to control the electric control valve C through the controller 10 according to the pressure measured by the pressure transmitter D in the branch. Opening adjustment, under the premise of ensuring the flow, keep the pressure difference in branch B small, and will not cause reverse flow.

In this embodiment, the outlet pressure of the pressure reducing and stabilizing valve 5 will not change due to changes in the inlet pressure. When the pilot valve of the pressure reducing and stabilizing valve 5 is adjusted to set a certain pressure value, the outlet pressure will remain constant. In order to reduce the flow change caused by pressure stabilization, the controller 10 needs to adjust the set pressure value according to the values of the pressure transmitter D on the branch circuit B and the fifth pressure transmitter 6 on the main pipeline 11, Make the pressure difference between the front and back of the pressure reducing and stabilizing valve 5 within a certain range, so as not to cause a large flow loss. The electromagnetic flowmeter 7 is used to measure the flow of the main pipeline 11. When the flow of the main pipeline 11 is insufficient, the controller 10 increases the opening of the electric regulating valve C to reduce the pressure difference of the pressure reducing and stabilizing valve 5 to increase The flow rate of the main line 11, when the flow rate of the main line 11 is too large, reversely operate the electric regulating valve C and the pressure reducing and stabilizing valve 5.

In this embodiment, when the water storage capacity of the water supply vehicle A3 is about to be exhausted, the pressure in the branch B3 decreases, and the controller 10 controls the opening of the electric regulating valve C3 on the B3 branch to decrease until it is closed, and controls the remaining branch B1 and B2 pipelines The electric control valves C1 and C2 of the electric control valves are opened more, and the water supply truck A4 is turned on synchronously, so that the water supply truck A3 and the water supply truck A4 can realize synchronous switching. During this switching process, the controller 10 adjusts the set pressure value according to the values of the pressure transmitter D on each branch B and the fifth pressure transmitter 6 of the main pipeline 11, so that the front and back of the pressure reducing and stabilizing valve 5 The pressure difference is within a certain range and will not cause a large flow loss. According to the measured value of the electromagnetic flowmeter 7, when the flow of the main pipeline is too large, the controller 10 controls the opening of the electric regulating valve C on each branch to decrease, so that the flow of the main pipeline 11 is reduced to the demand value of the on-board centrifugal pump 8.

The operation method of the accumulation liquid supply system provided by the present invention comprises the following steps:

a. Keep the opening of the electric regulating valve (C1, C2, C3) at the minimum, and turn on the fire pumps of the water supply trucks (A1, A2, A3) in sequence;

b. The controller 10 adjusts the opening of the electric control valves (C1, C2, C3) according to the values of the branch pressure transmitters (D1, D2, D3), and keeps the pressure difference in the branches small under the premise of ensuring the flow rate ;

c. At the same time, the controller 10 automatically adjusts the set pressure value according to the values of the pressure transmitters (D1, D2, D3) on the branches and the fifth pressure transmitter 6 on the main pipeline 11, so that the pressure reducing and stabilizing valve 5 The pressure difference between front and back is within a certain range, which will not cause a large flow loss;

d. When the flow rate of the main pipeline 11 is insufficient, the controller 10 increases the opening of the electric regulating valves (C1, C2, C3) to reduce the pressure difference of the pressure reducing and stabilizing valve 5 to increase the flow rate of the main pipeline 11. When the flow rate of the main pipeline 11 is too large, reversely operate the electric regulating valves (C1, C2, C3) and pressure reducing and stabilizing valve 5;

e. When the water storage capacity of the water supply truck A3 is about to run out, the pressure in the branch B3 decreases, and the controller 10 controls the opening of the electric regulating valve C3 on the B3 branch to decrease until it is closed, and controls the electric control valve C3 on the other branch (B1, B2) pipelines. The opening of the regulating valve (C1, C2) is increased, and the water supply truck A4 is turned on synchronously, so that the water supply truck A3 and the water supply truck A4 can realize synchronous switching;

f. The controller 10 performs steps b, c and d.

The description of the present invention has been presented for purposes of illustration and description, but is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and changes will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to better explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention and design various embodiments with various modifications as are suited to the particular use.

Claims (4)

1. a kind of gathering liquid-supplying system, including water tender for fire fighting truck（A）, branch（B）, gather pipeline（4）, controller （10）And main line（11）；It is characterized in that：The water tender（A）There is multiple, water tender（A）Pass through corresponding branch（B）It adopts With mode in parallel and gather pipeline（4）Connection；The branch（B）It is equipped with electric control valve（C）, pressure transmitter（D）And Non-return valve（E）；It is described to gather pipeline（4）With main line（11）Connection, main line（11）On successively be equipped with decompression venting valve（5）、 5th pressure transmitter（6）, electromagnetic flowmeter（7）, vehicle-mounted centrifugal pump（8）And fire monitor（9）；The controller（10）Respectively with Electric control valve（C）, pressure transmitter（D）, decompression venting valve（5）, the 5th pressure transmitter（6）And electromagnetic flowmeter（7）Even It connects.

2. according to claim 1 gather liquid-supplying system for fire fighting truck, it is characterised in that：The controller（10）It adopts Use PID controller.

3. gathering liquid-supplying system as described in claim 1, it is characterised in that：The decompression venting valve（5）Equipped with pilot valve, control Device（10）It is connect with pilot valve by electromagnetic control apparatus.

4. a kind of based on the operating method for gathering liquid-supplying system described in claim 1, feature includes the following steps：

A. electric control valve is kept（C1、C2、C3）Minimum aperture, open water tender successively（A1、A2、A3）Fire pump;

B. controller（10）According to branch pressure transmitter（D1、D2、D3）Value is to electric control valve（C1、C2、C3）Carry out aperture It adjusts, under the premise of ensureing flow, keeps the differing pressure in branch smaller;

C. simultaneously controller（10）According to the pressure transmitter of branch road（D1、D2、D3）And main line（11）On the 5th pressure Transmitter（6）Numerical value, adjust automatically setup pressure value makes decompression venting valve（5）Front and back pressure difference in a certain range, It will not lead to larger flow loss；

D. work as main line（11）When underfed, controller（10）By increasing electric control valve（C1、C2、C3）Aperture, subtract Small decompression venting valve（5）Pressure difference, for increasing main line（11）Flow, work as main line（11）It is reversed to grasp when flow is excessive Make electric control valve（C1、C2、C3）And decompression venting valve（5）;

E. water tender（A3）When water-holding quantity will exhaust, branch（B3）In pressure reduction, controller（10）Control（B3）Branch On electric control valve（C3）Aperture reduces until closing, controls remaining branch（B1、B2）Electric control valve on pipeline（C1、 C2）Aperture increases, and synchronous unlatching water tender（A4）, make water tender（A3）And water tender（A4）It can realize synchronism switching；

F. controller（10）The step of carrying out b, c and d carries out.