CN108671448B - Centralized liquid supply system for fire fighting truck and operation method - Google Patents

Abstract

The invention discloses a gathering liquid supply system for fire trucks, comprising water supply trucks, branch roads, gathering pipelines, controllers and main pipelines; there are multiple water supply trucks, and the water supply trucks are connected in parallel through corresponding branch roads It is connected with the gathering pipeline; the branch is provided with electric regulating valve, pressure transmitter and check valve; the gathering pipeline is connected with the main pipeline, and the main pipeline is provided with pressure reducing and regulating valve, fifth pressure transmitter, electromagnetic Flowmeter, vehicle-mounted centrifugal pump and fire monitor; the controller is respectively connected with electric regulating valve, pressure transmitter, pressure reducing and regulating valve, fifth pressure transmitter and electromagnetic flowmeter. The invention can ensure the continuous and stable water consumption of the on-board pump of the fire truck, can meet various water requirements according to the size of the fire field, and is especially suitable for large-flow and high-pressure occasions required in large-scale fires. The invention makes full use of the pressure provided by the water supply vehicle, offsets part of the power of the vehicle-mounted pump for preventing the vehicle, and saves energy.

Description

A concentrated liquid supply system and operation method for fire trucks

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 vehicle-mounted pump of a fire truck.

Background technique

With the rapid development of large-scale cities in my country, population agglomeration, living quarters and high-rise buildings are increasing day by day, urban fire protection has ushered in new challenges. At present, urban fire trucks are faced with problems such as high floors and narrow roads. The vehicle-mounted fire-fighting system has a single water supply form and poor water supply capacity, which cannot meet the continuity of water supply in a limited space; nor can it meet the high pressure and large flow of large fire sites. Requirements for the continuity and stability of the liquid supply.

In the existing water supply technology, the method that multiple water supply vehicles supply water to a fire truck is through a simple storage tank, that is, the water supply truck supplies water to the simple storage tank, and the fire truck on-board pump absorbs the water in the simple storage tank to extinguish the fire. However, the existing technology is inconvenient to operate, the simple water storage tank has limited capacity, takes a certain amount of time to fill the water storage tank, wastes precious rescue time, and cannot utilize the water pressure of the water supply truck, resulting in a certain pressure waste.

SUMMARY OF THE INVENTION

Based on the problems existing in the background technology, the present invention proposes an aggregated liquid supply system for on-board pumps of fire trucks, which is used in the working condition that multiple water supply trucks supply water to one on-board pump of fire trucks, so as to ensure the stable and continuous pressure and flow of water supply. .

A gathering liquid supply system for fire trucks proposed by the present invention includes a water supply truck, a branch circuit, a gathering pipeline, a controller and a main pipeline; there are multiple water supply trucks, and the water supply trucks are connected in parallel through the corresponding branch roads. It is connected with the gathering pipeline; the branch is equipped with electric regulating valve, pressure transmitter and check valve; the gathering pipeline is to aggregate multiple water channels into one channel of water, with various structures, according to the fluid impact during the parallel process of multiple pumps As a rule, a simple detachable modular structure is selected, and the diameter of the convergence pipeline is much larger than the diameter of the branch pipeline; the gathering pipeline is connected to the main pipeline, and the main pipeline is provided with a pressure reducing valve, a fifth pressure transmitter, an electromagnetic Flowmeter, vehicle-mounted centrifugal pump and fire monitor; the controller is respectively connected with electric regulating valve, pressure transmitter, pressure reducing and regulating 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 regulating valve is constant and will not change due to changes in 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 value of the main circuit, and control the electric regulating valve to adjust the opening according to the comparison results; The outlet pressure value is input on the panel, and the pressure reducing and regulating valve is automatically adjusted.

As an improvement, the controller adopts a PID controller.

As an improvement, the pressure reducing and regulating 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 gathering liquid supply system, comprising the following steps:

a. Keep the opening of the electric regulating valve to a minimum, and turn on the fire pump of the water supply truck 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 on the premise of ensuring the flow;

c. At the same time, the controller automatically adjusts the set pressure value according to the value of the pressure transmitter on the branch circuit and the fifth pressure transmitter on the main circuit, so that the pressure difference between the front and rear of the pressure reducing and regulating valve is within a certain range, and will not cause Large flow loss;

d. When the flow of the main line is insufficient, the controller reduces the pressure difference of the pressure reducing and regulator valve by increasing the opening of the electric regulating valve to increase the flow of the main line. When the flow of the main line is too large, the electric Regulating valve and pressure reducing valve;

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

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

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

Beneficial effects: The agglomeration liquid supply system for fire trucks provided by the present invention can ensure the continuous and stable water consumption of the on-board pumps of fire trucks, and can meet various water requirements according to the size of the fire field, and is especially suitable for large-scale fires. high flow and high pressure occasions. Compared with the existing technical solution, it occupies a small area, does not require preparation time, can be put into use in real time, and prolongs 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 anti-vehicle on-board pump, saving energy.

Description of drawings

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

In the picture: A1, the first water supply truck, A2, the second water supply truck, A3, the third water supply truck, A4, the fourth water supply truck, 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 gathering pipeline, 5, the pressure reducing valve, 6, the fifth pressure transmitter, 7, the electromagnetic flowmeter, 8, the vehicle centrifugal pump, 9, the fire monitor, 10 , controller, 11, main circuit.

Detailed ways

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

As shown in FIG. 1 , the system for gathering liquid supply for fire trucks proposed by the present invention includes four water supply trucks (A1, A2, A3, A4), four branch circuits (B1, B2, B3, B4), agglomeration The pipeline 4, the controller 10 and the main pipeline 11; the four water supply vehicles (A1, A2, A3, A4) are connected in parallel with the gathering pipeline 4 through the corresponding branches (B1, B2, B3, B4); There are 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 valve 5, a fifth pressure transmitter 6, an electromagnetic flowmeter 7. Vehicle-mounted centrifugal pump 8 and fire monitor 9; controller 10 adopts PID controller, and controller 10 is connected with electric regulating valve (C1, C2, C3, C4), pressure transmitter (D1, D2, D3, D4 respectively) ), the fifth pressure transmitter 6 and the electromagnetic flowmeter 7 are connected; the pressure reducing and regulating 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) are normally powered on to supply water, which is used to meet the water consumption of the on-board centrifugal pump 8 of the fire truck; When the water volume of one set is exhausted, the water supply truck A4 is used to replace the water supply to ensure the water volume 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 to the minimum, turn on the fire pump of the water supply truck in sequence, and the check valve E is used to prevent water from flowing back to the branch B of the fire pump of the water supply truck opened subsequently; The pressure water is transported to the gathering pipeline 4, and the water coming from different branches B in the gathering pipeline 4 reaches the inlet of the pressure reducing and regulating valve 5 after being converged; The transmitter 6 and the electromagnetic flowmeter 7 measure the pressure and flow of the water for feedback to the controller 10; then it reaches the inlet of the on-board pump 8 of the fire truck, and is pumped into the fire monitor 9 through the on-board centrifugal pump 8 to spray out the fire.

In this embodiment, due to the different lengths of the water belts in the branch circuit B and the different pipelines in the water supply vehicle A, the liquid resistance is different. The opening adjustment, on the premise of ensuring the flow, keeps the pressure difference in the branch B small, and will not cause reverse flow.

In this embodiment, the outlet pressure of the decompression and stabilizer valve 5 will not change due to the change of the inlet pressure. When the pilot valve of the decompression and stabilizer valve 5 is adjusted to set a certain pressure value, the outlet pressure will maintain a constant pressure. In order to reduce the flow change caused by voltage stabilization, the controller 10 needs to adjust the set pressure value according to the value of the pressure transmitter D on the branch circuit B and the fifth pressure transmitter 6 on the main circuit 11, The pressure difference between the front and rear of the pressure reducing and regulating valve 5 is kept within a certain range, so that a large flow loss will not be caused. The electromagnetic flowmeter 7 is used to measure the flow of the main line 11. When the flow of the main line 11 is insufficient, the controller 10 reduces the pressure difference of the pressure reducing and regulating valve 5 by increasing the opening of the electric regulating valve C to increase the The flow of the main line 11, when the flow of the main line 11 is too large, the electric regulating valve C and the pressure reducing and regulating valve 5 are reversely operated.

In this embodiment, when the water storage capacity of the water supply truck A3 is about to be exhausted, the pressure in the branch B3 decreases, the controller 10 controls the electric regulating valve C3 on the B3 branch to reduce the opening degree until it is closed, and controls the remaining branches B1 and B2. The opening of the electric regulating valves C1 and C2 increases, and the water supply vehicle A4 is opened synchronously, so that the water supply vehicle A3 and the water supply vehicle A4 can be switched synchronously. 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 circuit 11, so that the pressure reducing and regulating valve 5 can be adjusted before and after the pressure reducing 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 rate of the main line is too large, the controller 10 controls the opening of the electric regulating valve C on each branch to decrease, so that the flow rate of the main line 11 is reduced to the demand value of the on-board centrifugal pump 8 .

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

a. Keep the opening of the electric regulating valve (C1, C2, C3) to a minimum, and turn on the fire pump of the water supply truck (A1, A2, A3) in turn;

b. The controller 10 adjusts the opening of the electric regulating valve (C1, C2, C3) according to the value of the branch pressure transmitter (D1, D2, D3), and keeps the pressure difference in the branch small under the premise of ensuring the flow. ;

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

d. When the flow rate of the main line 11 is insufficient, the controller 10 reduces the pressure difference of the pressure reducing regulator valve 5 by increasing the opening of the electric regulating valves (C1, C2, C3), so as to increase the flow rate of the main line 11. When When the flow of the main line 11 is too large, reversely operate the electric regulating valve (C1, C2, C3) and the pressure reducing and regulating valve 5;

e. When the water storage capacity of the water supply truck A3 is about to be exhausted, the pressure in the branch B3 decreases, and the controller 10 controls the electric regulating valve C3 on the B3 branch to reduce the opening until it is closed, and controls the electric control valve on the other branch (B1, B2) pipelines. The opening of the regulating valves (C1, C2) is increased, and the water supply truck A4 is opened synchronously, so that the water supply truck A3 and the water supply truck A4 can be switched synchronously;

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, and is not intended to be exhaustive or to limit the invention to the form disclosed. Many modifications and variations 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 for various embodiments with various modifications as are suited to the particular use.

Claims (1)

1. an operation method for the accumulation liquid supply system of fire truck, it is characterized in that: comprise the accumulation liquid supply system for fire truck; Described for the accumulation liquid supply system of fire truck comprises water supply vehicle (A), Branch (B), gathering pipeline (4), controller (10) and main pipeline (11); there are multiple water supply trucks (A), and the water supply truck (A) adopts the corresponding branch (B) It is connected with the gathering pipeline (4) in parallel; the branch pipeline (B) is provided with an electric regulating valve (C), a pressure transmitter (D) and a check valve (E); the gathering pipeline ( 4) It is connected to the main pipeline (11), and the main pipeline (11) is sequentially provided with a pressure reducing and regulating valve (5), a fifth pressure transmitter (6), an electromagnetic flowmeter (7), and a vehicle-mounted centrifugal pump (8). ) and a fire monitor (9); the controller (10) is respectively connected with the electric regulating valve (C), the pressure transmitter (D), the pressure reducing and regulating valve (5), and the fifth pressure transmitter (6) and electromagnetic flowmeter (7) connection; The operation method of the accumulating liquid supply system for a fire truck further comprises the following steps: a. Keep the minimum opening of the electric regulating valve (C1, C2, C3), and turn on the fire pump of the water supply vehicle (A1, A2, A3) in turn; 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 maintains the pressure difference in the branch on the premise of ensuring the flow. smaller; 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 branch circuit and the fifth pressure transmitter (6) on the main circuit (11), so as to reduce the pressure The pressure difference between the front and rear of the pressure regulator valve (5) is within a certain range, which will not cause a large flow loss; d. When the flow of the main pipeline (11) is insufficient, the controller (10) reduces the pressure difference of the pressure reducing and regulating valve (5) by increasing the opening of the electric regulating valves (C1, C2, C3), so as to increase the main pipeline When the flow of the main line (11) is too large, reversely operate the electric regulating valve (C1, C2, C3) and the pressure reducing and regulating valve (5); e. When the water supply truck (A3) is about to run out of water, the pressure in the branch (B3) decreases, and the controller (10) controls the electric regulating valve (C3) on the branch (B3) to reduce the opening until it is closed, and controls the remaining branches. The opening of the electric regulating valves (C1, C2) on the road (B1, B2) pipeline increases, and the water supply truck (A4) is opened synchronously, so that the water supply truck (A3) and the water supply truck (A4) can be switched synchronously; f. The controller (10) performs steps b, c and d.

Images