JP2002274600A - Centralized supply system for kerosene - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a centralized supply system for kerosene, wherein possibilities of causing damages to devices and generating kerosene leakage are low, neither tank nor pump, both having a large capacity, is required to be used, the kerosene leakage is easily detected to quickly cope with it when generated, and safety can be improved. SOLUTION: A kerosene supply pipeline for supplying kerosene to a plurality of kerosene users has a common pipe 32 and pipes which are provided to respective floors of a building and are connected to the common pipe 32. The common pipe 32 is connected a kerosene tank 12 for common use through a pump, and the pipe provided to each floor is connected to respective indoor pipe arrangements for a kerosene user through a flow meter for each user. A kerosene tank provided on each floor is interposed between the common pipe 32 and the pipe provided to each floor. A flow meter for checking a flow rate is interposed between bypass pipe passages provided to the common pipe 32. The common pipe 32 has a first valve 1 which is interposed between portions where respective ends of the bypass pipe passages are connected to the common pipe 32, and a second valve is interposed between the kerosene tank provided on each floor and the common pipe 32. The on-off operation of each of the first and second valves is controlled by a main CPU on a pump control board.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a kerosene supply system, and more particularly to a system for centrally supplying kerosene from a kerosene tank to kerosene consumers living on each floor of a multi-storey building.

[0002]

2. Description of the Related Art
The supply of kerosene used as fuel in ordinary households,
This is done by each kerosene consumer (each household, etc.) individually purchasing small quantities from kerosene suppliers in portable tanks and the like. In this case, kerosene is injected into each kerosene-burning device at each home, for example, a device tank of a kerosene water heater or a kerosene heater.

In recent years, however, kerosene tanks have been installed in advance outdoors, for example, on the ground or underground, for each kerosene consumer or for a group of a plurality of kerosene consumers (such as an apartment house). Systems for supplying kerosene to equipment via kerosene piping have begun to spread. Although such a kerosene supply system requires an initial investment, once the system has been constructed, the kerosene supply company supplies kerosene to each kerosene consumer and the associated charges from each kerosene consumer. There is an advantage that collection and supply of kerosene to kerosene combustion equipment by each kerosene consumer can be facilitated.

In particular, in the case of an apartment house where kerosene users reside on each floor of a multi-storey building, a kerosene tank shared by a large number of kerosene consumers is installed, and a large number of kerosene demands are supplied from the common kerosene tank. The advantage of a kerosene centralized supply system that supplies kerosene to consumers is great. In the case of an apartment house in which a large number of kerosene consumers live, a common kerosene tank having a large capacity is required accordingly, and the common kerosene tank is generally buried underground.

Conventionally, in the case of a multi-story apartment house, kerosene is temporarily lifted from a common kerosene tank buried underground to a rooftop tank, and the height difference is used from the rooftop tank in order to supply kerosene to each kerosene consumer. And distribute it to each kerosene consumer on each floor. For this reason, it is necessary to install a tank having a relatively large capacity on the roof of the building. Further, once the remaining amount of kerosene in the roof tank reaches the minimum allowable level, the required amount (for example, the maximum allowable level) is detected. The amount of kerosene supplied to the roof tank is limited to a minimum amount, so a pump with a relatively large capacity is required.

[0006] Kerosene is always stored in the rooftop tank, and the natural environment of the rooftop of the building changes greatly. For example, the temperature difference between the rooftop tank of daytime and nighttime often exceeds 50 ° C. In addition, cracks, gaps, or looseness may occur in the roof tank or a connection portion between the roof tank and the kerosene pipe connected thereto, and kerosene may leak therefrom.

Accordingly, an object of the present invention is to provide a kerosene supply system which has a low possibility of breakage of equipment such as pipes and tanks used in a kerosene supply system and a low possibility of kerosene leakage from the kerosene supply system. Is to provide. Still another object of the present invention is to provide a kerosene centralized supply system that does not require a large-capacity tank or a large-capacity pump other than a common kerosene tank.

Further, if a kerosene leak occurs once in the kerosene supply system, it is important from the viewpoint of disaster prevention to immediately detect it and take prompt action.

Therefore, the present invention also provides a kerosene centralized supply system capable of easily detecting a kerosene leak in a kerosene supply system and further improving the safety by quickly coping with the leakage. It is the purpose.

[0010]

According to the present invention, as a means for achieving the above objects, kerosene is supplied to a plurality of kerosene consumers on a plurality of floors from a common kerosene tank by a pump via a kerosene supply pipe. A kerosene centralized supply system for supplying, wherein the kerosene supply pipe has a common pipe and each floor pipe connected to the common pipe, and the common pipe is connected to the common kerosene tank via the pump. The floor pipes are connected to respective indoor pipes of the kerosene consumer via a customer flow meter, and each floor kerosene tank is interposed between the common pipe and the floor pipes. A kerosene centralized supply system is provided.

In one embodiment of the present invention, the pump comprises a plurality of small pumps connected in parallel. In one embodiment of the present invention, two sets of the pumps are provided, one for normal operation and one for spare, which are connected in parallel with each other. In one embodiment of the present invention, a return pipe is provided for collecting overflow kerosene from each of the floor kerosene tanks into the common kerosene tank.

In one embodiment of the present invention, a control means for controlling the operation of the pump is provided, and a monitor signal of the amount of kerosene stored in each of the kerosene tanks is input to the control means. The means operates the pump based on the monitor signal. In one embodiment of the present invention,
The detected flow signal of the consumer flow meter is input to the control means.

In one embodiment of the present invention, the common pipe is provided with a bypass pipe, a flow meter for checking is interposed in the bypass pipe, and the bypass pipe is provided in the common pipe. A first valve is interposed between a portion to which one end is connected and a portion to which the other end is connected, and a second valve is provided between each of the floor kerosene tanks and the common pipe.
The opening and closing of the first valve and the second valve are controlled by the control means, and the detected flow signal of the check flow meter is input to the control means. In one aspect of the present invention, between the connection part of the common pipe closer to the floor pipe than the first valve and the bypass pipe and the check flow meter, One end of a return pipe for returning kerosene to the common kerosene tank is connected via a direction switching valve, and the operation of the direction switching valve is controlled by the control means.

In one embodiment of the present invention, a third valve is interposed between each floor kerosene tank and each floor pipe, and the opening and closing of the third valve is controlled by the control means.

In one embodiment of the present invention, the detected flow signal of the customer flow meter is also input to a centralized meter reading board.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a schematic configuration of a kerosene centralized supply system according to the present invention. Residential floor No. of apartment house 1 to No. Each of n (n is 10, for example) has a plurality of kerosene consumer homes. The number of kerosene consumers belonging to each residential floor is, for example, ten. In apartment houses,
One common kerosene tank 12 buried underground, 1 pump room underground
4 and a management room 16 are provided. The common kerosene tank 12 is provided with an oil level meter, and when the level meter reaches the minimum allowable level, kerosene is supplied to the tank 12.

As will be described later, a pump is disposed in the underground pump chamber 14. By operating this pump, kerosene is sucked from the common kerosene tank 12 and the kerosene is passed through the common pipe 32 to each of them. Supply to living floor. The kerosene that overflows at each residential floor is collected in the common kerosene tank 12 via the return pipe 34.

A main control device for controlling a kerosene supply pump and a system is arranged in the underground pump room 14, and a customer flow meter is arranged at each customer house on each living floor. In the management room 16, a centralized meter reading board for intensively metering the kerosene consumption of each kerosene consumer detected by a customer flow meter in all customer homes is arranged. The main controller, centralized meter reader and each customer flow meter are connected to signal wiring (for example, RS-4).
85).

FIG. 2 is a block diagram showing the configuration of the underground pump room 14 and the connection between the underground pump room 14 and the common kerosene tank 12.

A pump control panel having a pump section and a control section (control means) is arranged in the underground pump room 14. In the pump section, three electromagnetic pumps (with built-in check valves) a, b, and c for normal operation and three electromagnetic pumps (with built-in check valves) d, e, and f for standby are arranged. As these electromagnetic pumps, those having a relatively small discharge rate of about 16 l / h can be used. The electromagnetic pumps a to f are connected in parallel with each other, the suction port is connected to the common kerosene tank 12, and the discharge port is connected to the common pipe 32. The solenoid valve 1 is interposed in the common pipe 32, and a bypass pipe 36 connecting an upstream portion and a downstream portion thereof is provided. A check flow meter is interposed in the bypass line 36.

A bypass pipe 3 is provided between the connection part of the common pipe 32 downstream of the solenoid valve 1 (closer to each floor pipe) and the check flow meter.
6, one end of a return pipe 38 for returning kerosene to the common kerosene tank 12 via a three-port solenoid valve (direction switching valve) is connected. The three-port solenoid valve selects communication with the check flow meter side from the common pipe 32 side and the return pipe 38 side.

In the control section of the pump control panel, a main CPU as a main control device of the present system, a power supply section and a 10-key / display are arranged. The detected flow signal of the check flow meter is input to the main CPU, and the operations of the electromagnetic pumps a to f, the electromagnetic valve 1, and the 3-port electromagnetic valve are controlled by the main CPU. The main CPU is connected to an emergency stop button that is operated when it is desired to stop the supply of kerosene for all living floors. Power supply unit is 100V AC
It is converted to C12V and supplied to the check flow meter.

FIG. 3 is a block diagram showing the configuration of each residence floor.

Each floor kerosene tank 18 is interposed between each floor pipe 20 and the common pipe 32. Each floor kerosene tank 1
Numeral 8 temporarily stores kerosene for kerosene consumers belonging to the residential floor, and its capacity does not need to be so large, for example, about 20 liters is sufficient. The solenoid valve 2 is interposed between each floor kerosene tank 18 and the common pipe 32, and the solenoid valve 3 is interposed between each floor kerosene tank 18 and each floor pipe 20. Also, overflow kerosene from each floor kerosene tank 18 is returned to the pipe 34.
Supplied to.

Although not shown, each floor kerosene tank 18 has a built-in oil level meter such as a float type, and a monitor signal of the amount of kerosene (for example, a signal indicating that the oil level has reached an allowable minimum level). (A detection signal and a detection signal indicating that the maximum allowable level has been reached). Kerosene tank 1 on each floor
8, a communication terminal and a power supply unit are arranged.

Each floor piping 20 is connected to the indoor piping of all kerosene consumers belonging to the floor via a customer flow meter. 100V AC by power supply of kerosene tank 18 on each floor
Is supplied to the flow meter of each kerosene consumer, and the detected flow signal of the flow meter is transmitted to the communication terminal of each kerosene tank 18 via a signal line. The indoor piping of each kerosene consumer is connected via an electromagnetic valve 4 to kerosene combustion equipment such as a water heater.

The detected flow signal of the customer flow meter is transferred to the communication terminal of each kerosene tank 18 on the floor as described above, and further input to the main CPU. The operation of the solenoid valves 2, 3, and 4 is controlled by the main CPU via the communication terminal of each kerosene tank 18 (and, in the case of the solenoid valve 4, via the customer flow meter). . The communication terminal is connected with an emergency stop button operated when it is desired to stop supplying kerosene to the floor.

FIG. 4 is a block diagram showing the configuration of the management room 16. In the management room 16, a centralized meter reading board and a disaster prevention monitoring board are arranged. The centralized meter reading board has a function of managing items related to kerosene supply to each customer's home, and has a display touch panel, a printer, and a power supply unit,
In addition, a kerosene supply monitoring panel having a function of monitoring kerosene supply to each customer's home is provided. An emergency stop button that is operated when it is desired to stop the supply of kerosene for all floors or a desired floor is connected to the centralized meter reading board. The centralized meter reader is connected to the main CPU and the communication terminals of the kerosene tanks 18 on each floor. The centralized meter reading board is connected to a kerosene supply company via a telephone line.

The disaster prevention monitor panel is connected to the management company of the apartment house via a telephone line. When the kerosene supply monitor panel detects an abnormality in kerosene supply, it receives a signal to notify the management company. report.

FIG. 5 is a schematic diagram showing the entire configuration of the above-mentioned customer flow meter, particularly a flow rate detection system. These flowmeters are, for example, indirectly heated thermal flowmeters described in Japanese Patent Application Laid-Open No. H11-118566, and measure the instantaneous flow rate or integrated flow rate of kerosene flowing in a kerosene flow passage (pipe). The corresponding electric signal is output.

The ends of the fin plates 24 and 24 ′ of the flow rate detection unit 4 and the fluid temperature detection unit 6 extend into the fluid flow passage 3 formed in the flow passage member 2. The fin plates 24, 24 'extend through the center of the cross section in the fluid flow passage 3 having a substantially circular cross section. The fin plates 24, 24 'are arranged along the flow direction of the fluid in the fluid (kerosene) flow passage 3, so that the fin plates 24, 24' do not greatly affect the fluid flow, and the flow rate detection unit 22 and the fluid temperature detection unit are not affected. Good heat transfer between 22 'and the fluid is possible. The direction of fluid flow in the fluid flow passage 3 is indicated by an arrow.

A DC voltage V1 is supplied from a power supply section of each floor kerosene tank 18 to a bridge circuit (detection circuit) 40. The bridge circuit 40 includes a thin film temperature sensing element 41 for flow rate detection of the flow rate detection unit 4, a thin film temperature sensing element 41 ′ for temperature compensation of the fluid temperature detection unit 6, and resistors 43 and 44. The potentials Va and Vb at points a and b of the bridge circuit 40 are input to the differential amplification / integration circuit 46.

On the other hand, the DC voltage V2 supplied from the power supply of each kerosene tank 18 is supplied to the thin film heating element via a transistor 50 for controlling the current supplied to the thin film heating element 48 of the flow rate detection unit 4. 48.
That is, in the flow rate detecting section 22, based on the heat generated by the thin film heating element 48, the thin film temperature sensing element 41 performs temperature sensing under the influence of heat absorption by the fluid to be detected via the fin plate 24. Then, as a result of the temperature sensing, a difference between the potentials Va and Vb at points a and b of the bridge circuit 40 is obtained.

The value of (Va-Vb) changes when the temperature of the flow sensing element 41 changes according to the flow rate of the fluid. By appropriately setting the resistance values of the resistors 43 and 44 of the bridge circuit 40 in advance, the value of (Va-Vb) can be set to zero in the case of a desired fluid flow rate as a reference. At this reference flow rate, the output of the differential amplification / integration circuit 46 is constant (a value corresponding to the reference flow rate), and the resistance value of the transistor 50 is also constant. In this case, the partial pressure applied to the thin-film heating element 48 is also constant, and the voltage at the point P at this time indicates the reference flow rate.

When the fluid flow rate increases or decreases, the output of the differential amplification / integration circuit 46 has a polarity (depending on the positive or negative of the resistance-temperature characteristic of the flow rate sensing element 41) according to the value (Va-Vb). And the output of the differential amplifying / integrating circuit 46 changes accordingly.

When the fluid flow rate increases, the temperature of the flow rate detecting temperature sensing element 41 decreases, so that the differential amplification / integration is performed so as to increase the calorific value of the thin film heating element 48 (that is, increase the power). From the circuit 46, a control input to the base of the transistor 50 is made so as to reduce the resistance value of the transistor 50.

On the other hand, when the fluid flow rate decreases, the temperature of the flow rate detecting temperature sensing element 41 rises, so that the thin-film heating element 4
In order to reduce the heat value of the transistor 8 (that is, reduce the power), the differential amplification / integration circuit 46 provides a control input to the base of the transistor 50 so as to increase the resistance value of the transistor 50.

As described above, the heat generation of the thin film heating element 48 is feedback-controlled so that the temperature detected by the flow rate detecting temperature sensing element 41 always becomes the target value regardless of the change in the fluid flow rate. At this time, the thin film heating element 48
(Voltage at point P) corresponds to the fluid flow rate, and is taken out as a flow rate output. This flow rate output is A / D converted by the A / D converter 52,
After being accumulated by the PU 54, the accumulated flow is displayed by the accumulated flow rate display unit 56.

A control circuit 57 for controlling the opening and closing of the solenoid valve 4 is connected to the CPU 54. In addition, CPU
The 54 and the respective floor kerosene tanks 18 transmit and receive various signals such as an electric signal related to a flow rate such as an integrated flow rate and a signal related to solenoid valve control.

The customer flow meter has been described above.
The check flow meter also has basically the same configuration.

Hereinafter, the operation of the kerosene centralized supply system of this embodiment, in particular, the operation of the main CPU will be described in detail.

First, in a normal kerosene use state, the solenoid valve 1, the solenoid valve 3, and the solenoid valve 4 are all open, the solenoid valve 2 is closed, and the three-port solenoid valve is opened to the common pipe 32 side. I have.

The supply of kerosene to the kerosene tank 18 on each floor : With the consumption of kerosene at each kerosene consumer's home, the kerosene tank 18 on each floor
When the oil level in the inside falls and eventually reaches the permissible minimum level, a detection signal is input from the communication terminal to the main CPU via a signal line. Based on this signal input, the main CPU determines whether the solenoid valve 2 of the floor corresponding to the signal input is
Is opened, and one of the electromagnetic pumps a to c is driven to supply the kerosene in the common kerosene tank 12 to each floor kerosene tank 18 of the floor related to the signal input. Eventually, when the oil level in each of the floor kerosene tanks 18 rises and reaches the maximum allowable level, a detection signal is input from the communication terminal to the main CPU via a signal line. Based on this signal input, the main CPU stops driving the electromagnetic pumps a to c and closes the electromagnetic valve 2 of the floor corresponding to the signal input.

In the case where a request for kerosene replenishment to the kerosene tank 18 on each floor as described above occurs simultaneously for a plurality of residential floors, two or three of the electromagnetic pumps a to c are simultaneously driven to quickly perform the operation. The kerosene replenishment for one residential floor can be completed and then the kerosene replenishment for the other residential floor can be performed.

On the other hand, kerosene replenishment to the kerosene tanks 18 on each floor as described above can be executed in parallel for a plurality of residential floors. In this case, when the number of residential floors for which kerosene is supplied at the same time is large, two or three of the electromagnetic pumps a to c can be driven simultaneously. Then, after the supply of kerosene for all the residential floors is completed, the driving of all the electromagnetic pumps a to c is stopped.

The amount of kerosene supplied to each floor kerosene tank 18 as described above is a capacity corresponding to the difference between the allowable minimum level and the allowable maximum level of each floor kerosene tank 18. However, when kerosene is consumed on the living floor at the time of kerosene replenishment, it is a value obtained by adding the consumed amount. Since the kerosene consumption during kerosene replenishment can be grasped by the main CPU,
The main CPU can add the amount and store it as one kerosene supply amount.

As described above, in this embodiment, the kerosene tanks 18 having relatively small capacities are arranged on each of the dwelling floors, and the remaining amount of kerosene is detected. Therefore, although the number of times of kerosene replenishment is more frequent than in the past, it is not necessary to replenish a large amount of kerosene at a time, and therefore, pumps a to f having relatively small capacities can be used. There is an advantage that a method of appropriately setting the number of small pumps to be driven according to the number of living floors to be simultaneously replenished by using a combination of a plurality of small pumps is possible.

Further, in this embodiment, it is not necessary to install a relatively large roof tank, so that kerosene leakage frequently occurring in the roof tank and its surroundings can be prevented.

Detection of kerosene leakage in the kerosene supply system : This operation is executed at appropriate times, for example, periodically, for each of the following route sections.

(1) From the electromagnetic pump to the kerosene tank 18 on each floor
In accordance with a command from the main CPU, the solenoid valves 2 of all the living floors were closed (or confirmed to be closed), the solenoid valves 1 were closed, and the three-port solenoid valves were opened to the common pipe 32 side. After that (or confirming that it is closed), one of the electromagnetic pumps a to f is driven, and the flow rate of kerosene in the bypass pipe 36 is detected by the check flow meter. When the detected flow rate value is equal to or more than the allowable error range, it can be estimated that there is kerosene leakage in the route from the electromagnetic pump to each floor kerosene tank 18 of any of the dwellings.

By making the inner diameter of the bypass pipe 36 sufficiently smaller than that of the common pipe 32, the accuracy of flow rate detection by the check flow meter can be sufficiently increased (for example, detection of 20 cm ³ / h is possible). .

(2) Flow from the kerosene tank 18 to the customer
For each living floor on the route to the total , the kerosene tank 18
Kerosene consumption of all kerosene consumers on the living floor from the amount of kerosene replenished to the building (integrated flow rate detected using the customer flow meter)
If the value obtained by subtracting the sum is equal to or larger than the allowable error range, it can be estimated that there is kerosene leakage on the route from each floor kerosene tank 18 to any of the customer flow meters.

(3) From consumer flow meter to kerosene combustion equipment
If the instantaneous flow rate detected by each customer flow meter continues to be lower than the minimum flow rate value (which can be known in advance) when the kerosene-burning device with the minimum kerosene consumption is used, the customer flow rate It can be estimated that there is kerosene leakage in the path from the meter to any of the kerosene-burning appliances.

Operation check of electromagnetic pump : After closing the electromagnetic valve 1 and opening the 3-port electromagnetic valve to the return pipe 38 side,
One of the electromagnetic pumps a to f is driven, and the flow rate of kerosene in the bypass pipe 36 is detected by a check flow meter.
When the difference between the detected flow rate value and the set flow rate value of the electromagnetic pump is equal to or larger than the allowable error range, it can be estimated that the electromagnetic pump has functional deterioration. All electromagnetic pumps a to f
Check the operation individually.

When the emergency stop button is operated, the main CPU closes the solenoid valves 3 of the required living floor (or all living floors).

The integrating flow meter in the present invention is not limited to the one described in the above embodiment, and is not limited to the one using a thermal flow sensor.

[0058]

As described above, according to the present invention,
The kerosene supply piping is composed of common piping and each floor piping, and each floor kerosene tank is interposed between each floor piping and the common piping.Therefore, the roof tank and related piping are unnecessary, and it is used for the kerosene supply system. The possibility of breakage of equipment such as piping and tanks is low, the possibility of kerosene leakage from the kerosene supply system is low, and a large-capacity kerosene supply pump is not required.

Further, by interposing a check flow meter in the bypass pipe attached to the common pipe, it is possible to easily detect kerosene leakage in the kerosene supply system, and to deal with it promptly to improve safety. It is possible to do.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a kerosene centralized supply system according to the present invention.

FIG. 2 is a block diagram showing a configuration of an underground pump room and a connection relationship between the underground pump room and a common kerosene tank.

FIG. 3 is a block diagram showing a configuration of each residence floor.

FIG. 4 is a block diagram showing a configuration of a management room.

FIG. 5 is a schematic diagram showing an entire configuration of a customer flow meter, particularly a flow detection system.

[Explanation of symbols]

 2 Flow path member 3 Fluid flow path 4 Flow rate detection unit 6 Fluid temperature detection unit 12 Common kerosene tank 14 Underground pump room 16 Manager's room 18 Kerosene tank on each floor 20 Pipe on each floor 22 Flow rate detection unit 22 'Fluid temperature detection unit 24, 24' Fin plate 32 Common pipe 34 Return pipe 36 Bypass line 38 Return pipe 40 Bridge circuit (detection circuit) 41 Thin film temperature sensing element for flow rate detection 41 'Thin film temperature sensing element for temperature compensation 43, 44 Resistor 46 Differential amplification / integration Circuit 48 Thin film heating element 50 Transistor

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F23K 5/04 F23K 5/04 C

Claims (10)

[Claims] 1. A kerosene centralized supply system for supplying kerosene to a plurality of kerosene consumers on a plurality of floors via a kerosene supply pipe from a common kerosene tank by a pump, wherein the kerosene supply pipe is a common pipe and the common pipe. Each floor pipe connected to a pipe, the common pipe is connected to the common kerosene tank via the pump,
The pipes on each floor are connected to respective indoor pipes of the kerosene consumer via a customer flow meter, and a kerosene tank on each floor is interposed between the common pipe and the pipes on each floor. Kerosene centralized supply system. 2. The kerosene centralized supply system according to claim 1, wherein the pump comprises a plurality of small pumps connected in parallel. 3. The pump according to claim 1, wherein two sets of the pump are provided, one for normal operation and the other for pumping, and these are connected in parallel with each other. The described kerosene centralized supply system. 4. The kerosene centralized supply system according to claim 1, further comprising a return pipe for collecting overflow kerosene from each floor kerosene tank to the common kerosene tank. 5. A control unit for controlling an operation of the pump, wherein a monitor signal of an amount of kerosene stored in each of the floor kerosene tanks is input to the control unit, and the control unit transmits the monitor signal to the monitor signal. The kerosene centralized supply system according to any one of claims 1 to 4, wherein the pump is operated based on the operation. 6. The kerosene centralized supply system according to claim 5, wherein the detected flow rate signal of the customer flow meter is input to the control means. 7. The common pipe is provided with a bypass pipe, a flow meter for checking is interposed in the bypass pipe, and one end of the bypass pipe is connected to the common pipe. A first valve is interposed between the portion where the other end is connected and a portion where the other end is connected, and a second valve is interposed between each floor kerosene tank and the common pipe, The opening and closing of the first valve and the second valve are controlled by the control means, and a detected flow signal of the check flow meter is input to the control means.
The kerosene centralized supply system according to any one of the above. 8. The common kerosene is provided in the bypass line between a connection part of the common line closer to the floor line than the first valve with the bypass line and the check flow meter. 8. The method according to claim 7, wherein one end of a return pipe for returning kerosene to the tank is connected via a directional control valve, and the operation of the directional control valve is controlled by the control means. Kerosene centralized supply system. 9. A third valve is interposed between each floor kerosene tank and each floor pipe, and the opening and closing of the third valve is controlled by the control means. Item 9. A kerosene centralized supply system according to any one of Items 5 to 8. 10. The sensor according to claim 6, wherein the detected flow signal of the customer flow meter is also inputted to a centralized meter reading board.
10. The kerosene centralized supply system according to any one of 9.