KR101234989B1 - Apparatus starting automatically fire extinguishing pump for controling water hammer and surging - Google Patents

Abstract

PURPOSE: An apparatus for automatically starting a fire extinguishing pump is provided to prevent the malfunction of a fire extinguishing pump. CONSTITUTION: An apparatus for automatically starting a fire extinguishing pump comprises a water pressure sensing pipe(12) which divides to form the main discharging tube of a fire extinguishing pump, two or more pressure switches(22a,22b) and check valves(16) which are installed in a water pressure sensing pipe, an orifice hole(34) which is formed on the disk of the check valve, a globe valve(14) which is mounted between the check valve and main tube, and a flowing water confirmation window(18) which is installed in a water pressure sensing pipe.

Description

Fire extinguishing pump automatic starting device for water hammer and surging control {APPARATUS STARTING AUTOMATICALLY FIRE EXTINGUISHING PUMP FOR CONTROLING WATER HAMMER AND SURGING}

The present invention relates to a fire pump automatic start device, and more particularly, to a fire pump and a fire pump automatic start device for controlling water hammer and surging to reliably start and stop the fire pump by relieving the water hammer pressure and pulsating pressure.

In general, a fire extinguishing pump is one of a pressurized water supply apparatus for an aqueous fire extinguishing facility, and is widely used because it is able to discharge the flow rate at a constant pressure without any restriction on the installation place.

Extinguishing pump acts as a fire to radiate extinguishing water and to control and suppress fire, so it is no exaggeration to say that it is directly connected to the protection of human life and property, and reliability of the function of the extinguishing pump is very important.

The fire pump is driven by a hydraulic pressure switch for starting and stopping the pump automatically by detecting the pressure in the pipe, an example of the hydraulic pressure switch for starting is a pressure chamber method.

The pressure chamber system includes a pressure chamber on the discharge side of the fire pump, a safety valve, a pressure gauge and a pressure switch on the upper part of the pressure chamber, and a drain valve on the lower part of the pressure chamber.

In addition, the water chamber was filled with water 고 and the upper space 공기 with air to absorb the water hammer pressure and pulsating pressure to protect the equipment.

When the pressure in the pressure chamber falls below the set pressure, the pressure switch starts the fire pump and sends water to the pipe.

However, in this pressure chamber method, the air in the upper space in the pressure chamber is easily leaked by the start of the safety valve, and the inner space is filled with water only, so that the pulsation pressure cannot be absorbed, which causes the pressure switch to fail and the pump starts and Incomplete stopping leads to digestive failure.

In addition, the air is distributed in several places in the digestion pipe, the air is discharged to the pressure chamber when the fire pump is started. However, it is not sufficient to cover such air with the capacity of the pressure chamber.

Therefore, in order to solve such a problem, in recent years, the pressure sensing pipe is branched from the pump discharge side main pipe to directly connect the pressure switch, and check valves are provided at regular intervals therebetween, and a 2.4 mm diameter orifice hole is provided in the disc inside the check valve. Install by drilling.

At this time, the flow direction of the check valve flows from the pressure switch to the main pipe, and when the pipe becomes instantaneously high pressure, the check valve is closed and water flows only through the orifice to buffer the instantaneous pressure increase to prevent sudden stop of the pump. Prevents water hammer and surging.

However, the orifice of such a check valve is so small that when contaminated water is used as extinguishing water or left for a long time, the orifice hole may be blocked due to the formation of a scale or the like in the pipe, thereby preventing automatic operation of the pump.

In addition, the disk of the check valve is formed thin as a thickness of about 2.7mm, it is important to maintain regularly because such a check valve is likely to be damaged by the constant pulsating pressure of water.

However, the current method is not able to check whether the orifice hole is clogged by dismantling the check valve, and the check valve is replaced only when the pump is not driven. There is a problem.

Therefore, the object of the present invention is to prevent the malfunction of the fire pump by controlling the instantaneous water hammer pressure and pulsation pressure in the pipe, and visually check the flow of water through the flow of water check window when the fire pump is started or not to block the orifice It is possible to always check, increase the reliability of the fire extinguishing equipment, easy to install and provide an automatic fire extinguishing pump automatic fire pump for water hammer and surging control.

In accordance with the above object, the present invention, in the fire pump automatic starter, branching the hydraulic pressure sensing pipe from the discharge side main pipe of the fire pump, and at least two check valves and the starting pressure switch in a line in the hydraulic pressure sensing pipe The spacing between check valves is 1.5 ~ 2m, and the flow direction of check valve is installed to flow in the direction of main pipe from the pressure switch for starting, and the orifice hole of 2-3mm diameter is formed in the disc inside the check valve. A globe valve is installed between the check valve and the main pipe, and a water flow confirmation window is installed in the hydraulic pressure sensing pipe between the check valve and the starting pressure switch.

In addition, the present invention, in the automatic fire pump automatic branching device, the pressure sensing pipe branched from the discharge side main pipe of the fire pump, and at least two orifice holes and the starting pressure switch in the hydraulic pressure sensing pipe in a row, The spacing is 1.5 ~ 2m, and the orifice hole is penetrated to the inside of the orifice with a diameter of 2-3mm. A globe valve is provided between the orifice port and the main pipe, and the hydraulic pressure sensing pipe between the orifice port and the pressure switch for starting is provided. It is characterized by installing a water flow confirmation window.

The present invention prevents the pump malfunction by controlling the momentary water hammer and pulsating pressure in the pipe, and visually check the flow of water through the water flow confirmation window when the fire pump is started to determine whether the orifice is blocked without disassembling the device. It is possible to confirm, increase the reliability of the fire extinguishing equipment, increase the space utilization by not installing the pressure chamber, and easy to install and economical.

1 is a block diagram of an automatic fire pump automatic starting device according to an embodiment of the present invention,
2 is an operation of the globe valve according to an embodiment of the present invention,
3 is an operation of the check valve according to an embodiment of the present invention,
4 is a block diagram of an automatic fire pump automatic starting device according to another embodiment of the present invention,
5 and 6 are a perspective view and a side cross-sectional view of a flow control device according to another embodiment of the present invention,
7 is an operation of the flow regulating device according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention directly connects the hydraulic pressure sensing pipe equipped with a pressure switch to the discharge side main pipe of the fire pump, and by using the orifice principle to reduce the instantaneous water hammer pressure and pulsating pressure of the fluid flowing from the main pipe to the hydraulic pressure sensing pipe, Constant flow rate control prevents the fire pump from malfunctioning.

In addition, in order to facilitate the operation of the orifice, the hydraulic pressure sensing pipe is further equipped with a globe valve and a flow check window to further increase the reliability of the fire pump.

1 is a block diagram of a fire pump automatic starting device according to an embodiment of the present invention, Figure 2 is an operation of the globe valve according to an embodiment of the present invention, Figure 3 is a check valve according to an embodiment of the present invention It is also working.

The automatic fire extinguishing pump 10 according to the embodiment of the present invention shown in FIG. 1 has a globe valve 14 and an orifice hole in the hydraulic pressure sensing pipe 12 branched from the discharge side main pipe 4 of the fire pump 2. The check valve 16, the water flow confirmation window 18, and the starting pressure switches 22a and 22b provided with the 34 are provided.

The automatic fire extinguishing pump 10 according to the embodiment of the present invention is used to control the starting of the main pump and the auxiliary pump by being installed in the discharge side main pipe 4 of the fire pump 2 instead of installing the pressure chamber.

In the discharge-side main pipe 4 of the fire pump 2, a main check valve 6 for preventing backflow and a main opening / closing valve 8 for opening and closing the flow of running water are provided in this order from the discharge side of the fire pump 2.

The hydraulic pressure sensing pipe 12 of the automatic fire pump 10 is branched between the main check valve 6 and the main open / close valve 8 of the discharge side main pipe 4 of the fire pump.

Hydraulic pressure sensing pipe 12 may be installed in a stainless material to prevent corrosion. In addition, the diameter can be formed to 15 to 25mm to minimize the clogging phenomenon due to foreign matter.

On the inlet side of the hydraulic pressure sensing pipe 12, a globe valve 14 for adjusting the instantaneous hydraulic pressure in one step is provided as shown in FIG.

The globe valve 14 is a valve in which the seat orifice 26 is provided in the valve body 24, and the disk 28 controls the flow rate while moving up and down with respect to the seat orifice 26.

The globe valve 14 serves to relieve the water hammer pressure and pulsating pressure of the fluid by flowing only a predetermined amount of the flow rate flowing from the main pipe 4 at the inlet side of the hydraulic pressure sensing pipe 12 to the check valve 16.

In particular, the check valve 16 is thinly formed to a thickness of about 2.7 mm and may be damaged by the pulsating pressure and the water hammer pressure. The globe valve 14 has a fluid flowing from the main pipe 4 into the check valve 16. It serves to protect the check valve 16 by controlling the instantaneous water pressure to some extent before flowing.

At the back of the globe valve 14, at least two or more check valves 16 are provided at regular intervals to adjust the instantaneous water pressure in two stages.

The check valve 16 is originally used to limit the flow direction of the fluid in one direction and to prevent backflow.

The check valve 16 shown in FIG. 3 is configured such that the disk 32 is hinged in the valve body 30 to swing and to open and close the valve.

In the disk 32 of the check valve 16, an orifice hole 34 having a diameter of 2-3 mm is formed. The length of the orifice hole 34 can be formed to be 2.7 mm, which is the thickness of the disk 32 of the check valve 16.

Orifice hole 34 serves to reduce the pressure energy due to the difference in the velocity energy of the fluid by narrowing the diameter in the valve in accordance with the Bernoulli equation which is the law of energy conservation of fluid.

 The check valve 16 is installed so that the opening and closing direction of the disk 32 opens in the direction of the main pipe 4 from the starting pressure switches 22a and 22b, and is installed in the opposite direction to the flow direction of the fluid.

When the disk 32 of the check valve 16 has a high water pressure of the fluid flowing in the main pipe 4, the water flows only through the narrow orifice hole 34 in a closed state to alleviate the instantaneous pressure increase. The starting pressure switches 22a and 22b can be operated at the correct setting of the fire pump 2.

When the water pressure of the fluid flowing in the main pipe 4 is low, the disk 32 is opened, and the pressure switch 22a, 22b for starting quickly senses the water pressure to start the fire pump 2. To help.

The check valve 16 as described above is installed at least two, so as to be able to absorb the pulsating pressure and water hammer pressure step by step spaced apart from each other by more than 1.5m.

On the other hand, the orifice hole 34 of the check valve 16 is formed to be narrow to about 2 to 3 mm and may be easily clogged by foreign matters.

In particular, since the water-based fire-extinguishing equipment is not always used always, there is a greater risk of depositing foreign substances due to unused for a long time in the water tank 3 or the main pipe 4.

Such foreign matter may flow into the hydraulic pressure sensing pipe 12 along the main pipe 4 and block the orifice hole 34, thereby preventing the operation of the starting pressure switches 22a and 22b.

Therefore, in the embodiment of the present invention, the water flow confirmation window 18 may be further installed in the rear hydraulic pressure sensing pipe 12 of the check valve 16.

Water flow confirmation window 18 may be formed of a transparent sight glass. The water flow confirmation window 18 starts the fire pump 2 without disassembling the check valve 16 and checks the flow of water in the hydraulic pressure sensing pipe 12 from the outside to replace the check valve 16. Make sure you know when to clean.

Starting pressure switches 22a and 22b are provided in the rear pressure sensing pipe 12 of the water flow confirmation window 18.

The starting pressure switches 22a and 22b may be formed of pressure switches for starting the charging pump and the main pump, respectively.

4 is a block diagram of a fire pump automatic starting device according to another embodiment of the present invention, Figures 5 and 6 are a perspective view and a side cross-sectional view of a flow control device according to another embodiment of the present invention, Figure 7 is a view of the present invention Operation of the flow control device according to another embodiment.

Now, an automatic fire pump 10a according to another embodiment of the present invention will be described. Hereinafter, the same configuration as the embodiment of the present invention uses the same reference numerals and will not be described in detail.

As shown in FIG. 4, the automatic fire extinguishing pump 10a according to another embodiment of the present invention has a globe valve 14 in the hydraulic pressure sensing pipe 12 branched from the discharge side main pipe 4 of the fire pump 2. ), An orifice port 20, a water flow confirmation window 18, and starting pressure switches 22a and 22b are provided.

The orifice sphere 20 shown in FIGS. 5 and 6 is formed by forming an orifice hole 42 in the flow direction in the cylindrical body 36.

Orifice sphere 20 may be formed of a stainless steel resistant to corrosion.

On both sides of the cylindrical body 36 of the orifice sphere 20, a joining portion 38 having an inner thread is formed to be mounted on the hydraulic pressure sensing pipe 12. At this time, the connecting portion 38 is formed in a polygon may be configured to facilitate disassembly using a device such as a spanner.

The outer surface of the inner cylindrical body 36 inside the mating portion 38 is formed as a differential pressure wall 40 which relieves the water hammer pressure and the pulsating pressure of the fluid.

In the center of the differential pressure wall 40, an orifice hole 42 is formed to penetrate the inside of the orifice sphere 20.

The orifice hole 42 is formed with a diameter of 2 to 3 mm in the same manner as the orifice hole 34 of the check valve 16 according to the embodiment of the present invention.

The orifice hole 42 is formed to have a length of 15 to 25 mm along the flow direction. The length of the orifice hole 42 is formed to be 5 to 8 times longer than the length of the orifice hole 34 formed in the disk 32 of the check valve 16 according to the embodiment of the present invention, so that the flow rate of the orifice hole While passing (42), the effect of relieving the instantaneous water pressure and adjusting the fluctuation flow rate to the static flow rate is great.

As shown in FIG. 7, the fluctuating flow rate with the rapid pressure introduced from the main pipe 4 passes through the connection part 38 and strikes the differential pressure wall 40 to reduce the water hammer pressure and the pulsating pressure, and then the orifice sphere ( It passes through the orifice hole 42 formed long in 20, and it adjusts to a fixed flow volume and flows to the starting pressure switches 22a and 22b.

Orifice sphere 20 as described above is provided with at least two, so as to be able to absorb the pulsating pressure step by step at least 1.5m apart from each other.

Reference numeral '3' is a water tank, and '46' is a drain valve.

By the above configuration, the automatic fire pump 10 (10a) according to the embodiments of the present invention to prevent the malfunction of the fire pump (2) by relieving the instantaneous water hammer pressure and pulsating pressure in the pipe, It is possible to improve the reliability of the fire extinguishing system by starting and stopping at the correct setting of the fire pump 2.

In the above description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be defined by the described embodiments, but should be defined by the claims and equivalents of the claims.

2: fire pump 4: main pipe
16: check valve 8: main opening and closing valve
10,10a: automatic fire extinguishing pump 12: hydraulic pressure sensing pipe
14: globe valve 18: water flow confirmation window
20: Orifice 28,32: disc
34, 42: orifice hole 22a, 22b: starting pressure switch
38: connection part 40: differential pressure wall

Claims (4)

In the fire pump automatic starting device,
The hydraulic pressure sensing pipe 12 is branched from the discharge side main pipe 4 of the fire pump 2, and at least two check valves 16 and starting pressure switches 22a and 22b are connected to the hydraulic pressure sensing pipe 12. Installed in a row, the spacing between the check valve 16 is 1.5 to 2m, the flow direction of the check valve 16 is installed so as to flow from the starting pressure switch (22a) (22b) toward the main pipe (4). In the disk 32 inside the check valve 16, an orifice hole 34 having a diameter of 2 to 3 mm is formed, and a globe valve 14 is provided between the check valve 16 and the main pipe 4 and checked. A hydraulic pump automatic starting device for water hammer and surging control, characterized in that a water flow confirmation window (18) is installed between the valve (16) and the starting pressure switch (22a, 22b).
In the fire pump automatic starting device,
The hydraulic pressure sensing pipe 12 is branched from the discharge side main pipe 4 of the fire pump 2, and at least two orifice holes 20 and the starting pressure switches 22a and 22b are connected to the hydraulic pressure sensing pipe 12. Arranged in a row, the spacing between the orifice holes 20 is 1.5-2m, and the orifice hole 42 is formed to penetrate the orifice hole 20 to a diameter of 2-3 mm inside the orifice hole 20, and A globe valve 14 is provided between the main pipe 4, and a water flow confirmation window 18 is provided in the hydraulic pressure sensing pipe 12 between the orifice port 20 and the starting pressure switches 22a and 22b. Fire fighting pump automatic start device for water hammer and surging control.
The method of claim 2,
The orifice hole 42 is formed in the orifice hole 20 in a length of 15 to 25 mm along the flow direction to induce a variable flow rate flowing from the main pipe 4 to a fixed flow rate. Starting device.
The method of claim 2,
Orifice sphere (20) forms a joining portion (38) having inner threads on both sides of the cylindrical body (36) made of stainless material, and the outer surface of the cylindrical body (36) located inside the joining portion (38) is a pulsating pressure. Fire fighting pump automatic start device for water hammer and surging control, characterized in that formed by the differential pressure wall 40 to mitigate.

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