JP3950309B2 - Firefighting pump and firefighting car - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention, fire pumps, and relates to a fire vehicles equipped with fire pump.
[0002]
[Prior art]
Conventional fire-fighting vehicles are equipped with a fire pump that connects the left and right water inlets of the vehicle body and the relay port for taking in pressurized water to the water intake pipe of the pump body, and connects the right and left water outlets to the discharge pipe. The engine of the fire engine is switched from running to drive the pump body, and water is discharged to the fire from the water discharge nozzle at the tip of the hose connected to the left or right water outlet of the vehicle body connected to the discharge pipe of the pump body. . When the pump body absorbs water and the water discharged from the discharge nozzle is a source of non-pressure water such as fire tanks, ponds, rivers, etc., the vacuum pump is driven by the engine of the fire engine and the inside of the pump body is evacuated. Then, the vacuum action must be used to draw non-pressure water to fill the inside of the pump body, and then the pump body must be driven to discharge water.
[0003]
[Problems to be solved by the invention]
Conventionally, since only one vacuum pump is provided in the water absorption line or the discharge line, it takes a long time to draw non-pressure water from the water source to the inside of the pump body (about 10 minutes). Since the water was discharged to the fire source by driving the pump body after that, it had to leave the fire burning until the water discharge was started.
[0004]
[Means for Solving the Problems]
In view of the above, there than was allow the water discharge to fire fighting quickly as possible moment, it comprises a water inlet and a incorporating relay port Yu-pressure water absorption line of pump body, a discharge pipe in fire pumps with outlets to the road, the first vacuum pump provided in the water line, provided with a second vacuum pump to the discharge conduit Rutotomoni, to the relay port, the first, second in vacuum pumping, characterized in that a vacuum actuated valve to break the communication between the relay port and the water conduit. Also, fire engines of the invention, characterized in that it is equipped with the above fire pump.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
In the illustrated embodiment, P has a water absorption line 11 and a discharge line 12, and is driven by switching the engine of the fire engine from running with a pump body of a fire pump mounted on the body B of the fire engine. The On the left and right sides of the vehicle body B, as is well known, water inlets 13L and 13R for non-pressure water (fire-resistant water tanks, water that does not have a water source such as rivers) opened and closed by cocks, fire hydrants and other fire engines Are provided with relay ports 14L, 14R for taking in pressurized water from a fire pump or the like, and water discharge ports 15L, 15R for connecting a water discharge pipe having a water discharge nozzle at the tip. In the illustrated embodiment, the left and right water inlets 13L and the relay port 14L, and the water inlet 13R and the relay port 14R of the vehicle body are connected in a branch shape to the left and right auxiliary water inlet channels 11L and 11R communicating with the water inlet channel 11. is doing. Of course, the auxiliary water pipe 11L, not through the 11R, vehicle body and the left and right water inlet 13L and the relay ports 14L and water inlet 13R relay port 14R in water conduit 11 may be directly connected. Further, the left and right water discharge ports 15L, 15R of the vehicle body B are plural, and the plurality of water discharge ports 15L, 15L... And the water discharge ports 15R, 15R. 12L and 12R are connected in a branch shape.
[0006]
A first vacuum pump VP ₁ that sucks non-pressure water from a water source (fire prevention water tank, river, etc.) into the water absorption pipe 11 is connected to the water absorption pipe 11 via a check valve V ₁ and a water stop valve V _2. Yes connected, also, the delivery line 12 and the second vacuum pump VP ₂ siphon non-pressure that is absorbed by the water pipe 11 in the interior of the pump body P in is likewise check valve V _1, stop It is connected via a water valve V _2.
[0007]
Therefore, when discharging non-pressure water from the water discharge nozzle at the tip of the hose (not shown) connected to the water discharge ports 15L and 15R (cock opening) toward the fire, the water absorption pipe 13 is connected to the water absorption port 13L or the water absorption port 13R. '(The water inlet 13L or the cock of the water inlet 13R is opened), the strainer at the tip of the water inlet pipe 13' is immersed in the water source, and the first and second vacuum pumps VP ₁ and VP ₂ are simultaneously connected to the fire engine. The first vacuum pump VP ₁ absorbs non-pressure water from the water source to the water absorption pipe 11 and the second vacuum pump VP ₂ sucks water from the water absorption pipe 11 into the pump body P. Thus, the non-pressure water is sucked up by the water absorption relay system using the first and second vacuum pumps VP ₁ and VP ₂ . At that time, each of the vacuum pumps VP ₁ and VP ₂ shuts off the water with the stop valve V ₂ and sucks and exhausts only the air. When the inside of the pump body P is full and the expiration is completed, the pump body P is driven by the engine of the fire engine and the operation of each vacuum pump VP ₁ , VP ₂ is stopped and the water is discharged to the discharge line 12, Water is discharged from the water discharge nozzle through a hose connected to the water discharge port 15L or the water discharge port 15R.
[0008]
The relay ports 14L and 14R for taking in pressurized water from a fire hydrant and the like are provided between the relay ports 14L and 14R and the water intake pipe 11 during the operation of the first and second vacuum pumps VP ₁ and VP ₂ . A negative pressure operating valve 20 for disconnecting communication is provided. As a result , during the operation of the first and second vacuum pumps VP ₁ and VP ₂ , the communication between the relay port 14L and the water inlet 13L, and the relay port 14R and the water inlet 13R is cut off by the negative pressure operating valve 20 by the vacuum action. . Therefore, when the first vacuum pump VP ₁ sucks air from the water suction port 13L and the water suction port 13R and sucks the non-pressure water into the water suction pipe 11, the first vacuum pump VP ₁ connects from the negative pressure operating valve 20 to the relay port. 14L, working with even need not to suck out air in the relay pipe 14 to 14R, when even if priming is completed to the pump body P remaining air in the relay pipe 14, the pump body P Even if the water discharge is started, the air remaining in the relay pipe 14 enters the pump body P , so that the water cannot be discharged until the air is completely discharged from the nozzle at the tip of the hose . After the operation of the vacuum pump VP ₁ of ₁ is started, the time required to discharge the non-pressure water is shortened.
[0009]
2 and 3, the negative pressure operating valve 20 includes a hollow housing 21 and a valve body 24 that can move up and down inside the hollow housing 21 , and the hollow housing 21 is connected to the relay ports 14L and 14R. The valve body 24 has a connection port 22 and a communication port 23 to the water absorption pipe 11, and the valve body 24 is based on the difference in pressure receiving area and is connected to the relay port when the first and second vacuum pumps VP ₁ and VP ₂ are operated. 14L, the connection port 22 and the water conduit 11 and 14R, in the illustrated embodiment by disconnecting the communication port 23 of the auxiliary water line 11L, 11R, when the relay port 14L, 14R is incorporated Yu-pressure is On the contrary, the connection port 22 and the communication port 23 are communicated with each other by moving. Specifically, the connection port 22 connected to the left and right relay ports 14L and 14R by the relay tube 14 and the water absorption pipe 11 , and the connection port connected to the left and right auxiliary water absorption pipes 11L and 11R in the illustrated embodiment by pipes. 23 is provided in the hollow housing 21 at a phase of 90 °, the connection port 22 is opened downward, and the connection port 23 is opened sideways. Inside the hollow housing 21 , a lower valve seat 26 is provided above the connection port 22, and an upper valve seat 27 is provided above the communication port 23. The valve body 24 includes a lower valve 28 and an upper valve 29 which are provided on a valve shaft 25 movable in the vertical direction and open and close the lower valve seat 26 and the upper valve seat 27 from above. The diameter of the upper valve 29 is larger than that of the lower valve seat 26 and the lower valve 28, and the pressure receiving area of the upper valve 29 is larger than that of the lower valve 28. The lower valve seat 26 and the upper valve seat 27 are respectively provided with guide cylinders 26 ' and 27' for guiding the vertical movement of the valve shaft 25 supported by radial arms. Further, the hollow housing 21 has a port 30 that communicates a space below the lower valve seat 26 of the connection port 22 and a space 21 ′ above the upper valve seat 27 inside the hollow housing 21 .
[0010]
When the first and second vacuum pumps VP ₁ , VP ₂ are operated and vacuum is applied to the hollow housing 21 through the auxiliary water intake pipes 11R, 11L and the communication port 23, the upper valve 29 having a large pressure receiving area is moved to the upper valve seat 27. Closely closed from above, the lower valve 28 also closes closely to the lower valve seat 26 from above, whereby the inside of the atmospheric pressure relay pipe 14 from the connection port 22 to the relay ports 14L and 14R is shut off. The air in the relay pipe 14 is not sucked by the first and second vacuum pumps VP ₁ and VP ₂ . Therefore, the first, second vacuum pump VP _1, VP ₂ suction amount of air by evacuation, the relay port 14L, 14R is reduced than in the case in communication with the intake water conduit 11, intake early that much The inside of the water pipe 11 can be evacuated to draw non-pressure water into the pump body P. When the operation of the first and second vacuum pumps VP ₁ and VP ₂ is stopped for water discharge, the pump body P is operated, and the vacuum does not act from the communication port 23 to the inside of the hollow housing 21, the valve body Since the valve element 24 is closed by the action of its own weight and the coil spring 31 described later, the air inside the relay pipe 14 from the connection port 22 to the relay ports 14L and 14R does not flow out to the water absorption pipe 11, Water discharge does not start until the air is discharged from the water discharge nozzle through the hose, and water discharge starts immediately when the pump body P is driven.
[0011]
Further, the relay ports 14L and 14R are connected to a fire hydrant, and pressurized water having a pressure P ₁ acts on the lower valve 28 from below through the relay ports 14L and 14R (cock open), the relay pipe 14 and the connection port 22. In this case, a part of the pressurized water acts on the upper valve 29 having a large pressure receiving area through the port 30 from above. In this case, chromatic-pressure becomes smaller than the pressure P ₂ is the pressure P ₁ of the chromatic-pressure acting from above on the upper valve 29 because through a narrow port 30. Opening the force Fβ pushing the lower valve 28 upwardly, the force Fα pushes the upper valve 29 downward at a pressure P _2, the lower valve 28, the lower valve seat 26 by the area ratio between the upper valve 29 by this time the pressure P ₁ The opening degree of the lower valve 28 is controlled, and the pressure of the pressurized water flowing through the lower valve seat 26 to the communication port 23 is kept at a constant P ₃ . Therefore, since the pressurized water having the pressure P ₃ enters the inside of the pump body P from the communication port 23 through the water absorption pipe 11, the nozzle of the hose connected to the water discharge ports 15 L and 15 R by operating the pump body P. Can be discharged immediately. And if the flow of the pressurized water which flows from the connection port 22 to the connection port 23 is stabilized, the inside of the hollow housing 21 will be filled with water.
[0012]
Incidentally, upward of the valve body 24, or to the initial move downward, since the valve body 24 by the water flow is prevented from moving shake transiently, the flange 25 'provided on the upper portion of the valve shaft 25, the valve shaft 25 It is preferable that a coil spring 31 is fitted from above, and the elasticity of the coil spring 31 is applied between the flange 25 'and the upper wall of the hollow housing 21 to prevent the valve element 24 from swinging.
[0013]
Incidentally, the discharge pipe 12 to the branch portion between the left and right auxiliary discharge conduit 12L and the auxiliary discharge conduit 12R, although not Figure is provided with a well-known outlets self-closing valve 32. When the first and second vacuum pumps VP ₁ and VP ₂ are evacuated and non-pressure water is drawn into the pump main body P by the vacuum action, the water outlet is used to prevent air from entering from the water outlets 15L and 15R. The 15L and 15R cocks must be closed. However, if the water outlet automatic shut-off valve 32 is provided at the above position, the pump main body P is activated by the operation of the first and second vacuum pumps VP ₁ and VP ₂ regardless of the opening and closing of the cocks of the water outlets 15L and 15R. When the inside of the pump becomes negative pressure, the automatic outlet valve 32 is automatically closed due to the difference from the atmospheric pressure to prevent the intrusion of air from the outlets 15L and 15R, and the inside of the pump body P becomes full. It opens automatically with the water pressure, allowing water to flow into the outlets 15L, 15R . Therefore, it is only necessary to connect a water discharge hose to the water discharge ports 15L, 15R , open the cocks of the water discharge ports 15L, 15R , start the water discharge by operating the pump body P. In addition, the work of checking the outlets 15L, 15R can be omitted.
[0014]
Furthermore, in order to detect the water level (falling position) in the water-falling state where water is not discharged even if the pump body P is driven and the cocks of the water outlets 15L and 15R are opened, the water absorption pipe 11 has a capacitance type. A water level switch 34 is provided. Conventionally, a float switch is provided to detect the falling water position. The float switch accurately detects the water level when the water in the water absorption pipe 11 is stationary. However, when the flow occurs in the water, the float moves up and down, so the water level cannot be accurately detected. In addition, when dirty water is sucked and discharged, there is a drawback that it does not operate correctly if dirt in the water adheres to the movable part of the switch such as a float. However, if the capacitive water level switch 34 is used, the water falling position can be accurately detected without being affected by the flow of water or foreign matter in the water. The switch 33 provided in the discharge pipe 12 is a pressure switch, and is a switch for detecting the pressure at the completion of pumping.
[0015]
【The invention's effect】
As can be seen from the above description, when fire pump of the present invention is to discharge water-free pressure water, the priming be filled with water inside the pump body, a first vacuum pump provided in the water pipe, the discharge pipe It is performed by two second vacuum pump provided in, that halves the time required for priming which has been conventionally one of the vacuum pump, to reduce the accident fire performed sooner water discharge it can. In addition, since a negative pressure operation valve is provided at the relay port for taking in the pressurized water, the air inside the relay port piping is sucked out and exhausted when exhaling non-pressure water with the first and second vacuum pumps. Since there is no need, exhalation can be completed as much as that, and air inside the relay port piping does not flow out to the discharge pipe prior to water discharge. Therefore, there is no delay in the water discharge due to the air in the pipe of the relay port, and it is possible to reduce the arrow disaster.
Furthermore, since it is such a fire pump, it is most appropriate to mount it on a fire engine.
Then, when the water discharge-free pressure water, the first and second operating vacuum pump at the same time, it is sufficient to stop the operation at the same time After completing the priming handle, the operation is easy.
[Brief description of the drawings]
FIG. 1 is a plan view showing a main part of a fire engine equipped with a fire pump of the present invention.
2A is a longitudinal sectional view of a negative pressure operating valve in a closed state, FIG. 2B is a plan view of an upper valve seat taken along the line BB of the above, and FIG. 2C is an arrow CC The top view of the lower valve seat in a line.
FIG. 3 is a longitudinal sectional view of a negative pressure operating valve in an open state.
[Explanation of symbols]
B Fire engine body P Pump body VP ₁ , VP ₂ Vacuum pump V ₁ Check valve V ₂ Water stop valve 11 Water intake pipe 11L , 11R Left and right auxiliary water intake pipe 12 Discharge pipe 12L , 12R Left and right auxiliary discharge pipe Roads 13L and 13R Left and right water inlets 14L and 14R of the vehicle body Left and right relay ports 15L and 15R Left and right water outlets of the vehicle body 20 Negative pressure operating valve 21 Hollow housing of the negative pressure operating valve 24 Valve body 32 of the negative pressure operating valve Water outlet automatic shut-off valve 34 Capacitance pressure switch

Claims (2)

In the fire pump with a water intake port in the pump main body and a relay port for taking in pressurized water, and a water discharge port in the discharge line,
A first vacuum pump is provided in the water absorption line;
Rutotomoni providing the second vacuum pump to the discharge conduit,
The relay port is provided with a negative pressure operating valve that cuts off communication between the relay port and the water suction pipe during operation of the first and second vacuum pumps.
Fire pump characterized by that. Fire vehicles, characterized in that mounting the fire pump according to claim 1.

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