JP2595524Y2 - Oil leak detection device for air conditioning system - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil leak detecting device for an air conditioning system using a plurality of heating or cooling / heating air conditioning terminals.

[0002]

2. Description of the Related Art Conventionally, this type of air conditioning system used in schools and hospitals, for example, stores a large amount of kerosene in a storage tank buried underground, and pumps kerosene from the storage tank to a rooftop by a pump. After temporarily storing the kerosene in a relay tank installed in each floor, kerosene is supplied from the relay tank to door-to-door tanks installed on each floor, and kerosene is supplied from each door tank to a plurality of heating air conditioning terminals installed on each floor. To supply. Further, inside the relay tank, there is provided a liquid level detecting means for detecting whether the liquid level of kerosene stored in the relay tank has reached an upper limit and a lower limit, respectively.
The amount of kerosene stored in the storage tank is automatically controlled by turning on and off the pump based on the detection signal from the liquid level detecting means.

[0003]

In the above-mentioned conventional air conditioning system, when the liquid level of kerosene in the relay tank reaches the upper limit, the operation of the pump is stopped by outputting a detection signal from the liquid level detecting means. However, if oil leakage due to crack breakage or the like occurs in the middle of the communication path from the storage tank to the relay tank, the liquid level of kerosene in the relay tank does not reach the upper limit, and the pump is kept operating. In other words, unless a spot where the oil is actually leaking is visually found, a large amount of oil leaks from the storage tank to the outside, causing a risk of fire and environmental destruction, as well as problems with processing costs after the oil leaks. Was a factor that caused

[0004] As a method of solving such a problem,
Japanese Utility Model Application No. 63-95012 (Japanese Utility Model Application No. 2-100040)
No.), even if the oil pump operates
Oil level rise in the storage part corresponding to the relay tank for a certain time or more
Refueling of combustion device that stops operation of refueling pump if not
A pump control device is disclosed. But in this case,
It is not possible to detect oil leaks from the oil tank to the reservoir.
The kerosene supply path from the reservoir to the previous air conditioning terminal
It cannot detect oil leaks that occur in
It can also reduce the amount of oil that leaks out of cracked roads
Can not.

Therefore, the present invention solves the above problems,
An oil leak occurs in the kerosene supply path to the air conditioning terminal
Also reduce the amount of oil that leaks out through cracks
It is an object of the present invention to provide an oil leak detection device for an air conditioning system which can be used .

[0006]

SUMMARY OF THE INVENTION The present invention provides a kerosene storage tank, a relay tank which is connected to the storage tank and temporarily stores the kerosene from the storage tank, and a kerosene supplied from the relay tank. Multiple air conditioning terminals to be fueled and front
The kerosene supply channel that supplies kerosene to the air conditioning terminal
Number of solenoid valves and the flow rate of kerosene flowing through the kerosene supply path
Flow meter for outputting a discharge detection signal and operation of the air conditioning terminal
A computation unit for calculating the kerosene supply amount from a total number, the flow
Calculate the actual kerosene supply from the detection signal output from the meter.
To the actual kerosene supply and the calculation unit.
Compare the total amount of kerosene supply calculated by
When an oil leak is detected based on the result, the plurality of electromagnetic
Electromagnetic valve control means for simultaneously closing the valves .

[0007]

According to the above construction, the flow meter flows through the kerosene supply passage.
Detects the flow rate of kerosene and outputs a detection signal.
The total kerosene supply is calculated from the number of operating terminals. this
When the arithmetic and control means detects the detection signal output from the flow meter
The actual kerosene supply is calculated from
Corresponds to the total kerosene supply amount calculated by the calculation unit.
If there is more than a certain level, oil leaks in the middle of the kerosene supply path
Is determined to have occurred, and
Closed multiple solenoid valves to prevent oil leakage to the outside.
Stop.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In the figure, 1 is an underground tank as a storage tank storing a large amount of kerosene, 2 is a relay tank installed on a roof, for example, connected to the underground tank 1, and between the underground tank 1 and the relay tank 2 , A pipe 3 serving as a communication passage is provided. Then, kerosene from the underground tank 1 is pumped by an electric pump 4 which is a pump provided in the middle of the pipe 3, and is temporarily stored in the relay tank 2. Another pipe 5 is connected between the underground tank 1 and the relay tank 2, and when the kerosene of the relay tank 2 becomes full, the underground tank 1 is connected through the pipe 5.
Is to be returned to. On the other hand, 6 is relay tank 2
A lower limit liquid level detector 7 that outputs a detection signal S1 when the liquid level of kerosene in the relay tank 2 reaches a lower limit; And an upper limit liquid level detector 8 that outputs a detection signal S2 when the liquid level of the kerosene inside reaches the upper limit. A flow meter 9 is provided between the underground tank 1 and the electric pump 4 to detect the flow rate of kerosene flowing through the pipe 3 by measuring the number of pulse signals.
Is provided. In the flow meter 9, the flow rate of the kerosene in the relay tank 2 is set in advance from the lower limit to the upper limit, and the flow rate of the kerosene flowing through the pipe 3 is equal to or higher than the set flow rate. When the detection signal S
3 is output. The detection signal S3 from the flow meter 9 and the detection signals S1 and S2 from the liquid level detector 6 are supplied to an oil pump control panel 10 having an arithmetic control unit serving as a kerosene leak detecting means. The control panel 10 controls the operation of the electric pump 4 based on the presence or absence of the detection signal S2 at the time when the detection signal S3 is output. Further, the oil pump control panel 10 notifies the refueling indicator 12 provided on the central monitoring panel 11 of the completion of refueling when the relay tank 2 is fully charged. Reference numeral 13 denotes an exhaust pipe provided above the relay tank 2.

The kerosene stored in the relay tank 2 is supplied to door-to-door tanks 16 and 17 provided for each floor via a pipe 15 provided with an emergency shutoff valve 14. The kerosene in the door-to-door tank 16 is supplied with a flow meter 18 and a plurality of solenoid valves 19, 19a, 19
are supplied to the air conditioning terminals 21, 21a,... through a pipe 20 as a kerosene supply path provided with b,.
Also, kerosene in the door-to-door tank 17 is similar to the door-to-door tank 16,
On the way, a flow meter 22 and a plurality of solenoid valves 23, 23a, 23b,.
Are supplied to the air conditioning terminals 25, 25a,. In addition,
The air conditioning terminals 21, 21a, 25, 25a,... Include an air conditioning terminal for heating and an air conditioning terminal for cooling and heating. The solenoid valve
19, 19a, 19b, ... and solenoid valves 23, 23a, 23b, ...
Are provided for each of the air conditioning terminals 21, 21 a, 25, 25 a,..., But can be attached to arbitrary locations of the pipes 20, 24. In addition, each air conditioning terminal 2 connected to the door-to-door tank 16
A pipe 26 as a return path is provided between the kerosene supply path of 1, 21a.
A shutoff solenoid valve 27 is provided in the middle of 26. Further, a pipe 28 as a return path is also provided between the kerosene supply path of each of the air conditioning terminals 25, 25a, ... connected to the door-to-door tank 17 and the underground tank 1, and a shut-off solenoid valve 29 is provided in the middle of the pipe 28.
Is arranged.

The central monitoring panel 11 is provided with a calculation unit 31 and a communication unit 32 in addition to the refueling indicator 12. The communication unit 32 includes the air conditioning terminals 21, 21a,.
25a,... To detect which air conditioning terminal is operating. Moreover, the the information from the operation unit 31 is a communication unit 32, the air-conditioning device 21, 21a, calculates ... kerosene supply amount of the total from the operation number of the solenoid valve system the data D1
In addition to supplying the data to the arithmetic unit 33,
The total kerosene supply amount is calculated from the number of operating units 5, 25a,... And the data D2 is supplied to the calculation unit 34. The calculating unit 33 determines whether the solenoid valves 19 and 19 based on the comparison result between the number of pulse signals of the detection signal S4 output from the flow meter 18 and the data D1.
, And the opening and closing of the solenoid valve 27 are controlled. Similarly, the arithmetic unit 34 as the solenoid valve control means also has the flow meter
Based on a comparison result between the number of pulse signals of the detection signal S5 outputted from 22 and the data D2, the solenoid valves 23, 23a, 23
, and the opening and closing of the solenoid valve 29 are controlled. This flow meter 1
For example, when the flowmeters 8 and 22 and the flowmeter 9 have an accuracy of 10 CC / 1 pulse, if the flow rate is 1000 CC,
00 pulses will be generated.

Next, the operation of the above configuration will be described. First, the electric pump 4 is operated by operating the oil pump control panel 10 to pump kerosene stored in the underground tank 1 into the relay tank 2. When the detection signal S1 is output from the lower limit liquid level detector 7 with the rise of the liquid level of kerosene in the relay tank 2 by this series of operations, the oil pump control panel 10 flows through the pipe 3 with respect to the flow meter 9. Start detection of kerosene flow rate. The flow meter 9 previously sets the flow rate of the kerosene in the relay tank 2 from the lower limit to the upper limit, and
The actual flow rate of the kerosene flowing through the pipe 3 is compared with the actual flow rate of the kerosene, and when the flow rate of the kerosene in the pipe 3 reaches or exceeds the set flow rate, the detection signal S is sent to the oil pump control panel 10.
3, the oil pump control panel 10 immediately determines whether or not the kerosene liquid level in the relay tank 2 has reached the upper limit via the upper limit liquid level detector 8 based on the presence or absence of the detection signal S2. Detect based on At this time, when the liquid level of the kerosene in the relay tank 2 has already reached the upper limit and the detection signal S2 is output from the upper limit liquid level detector 8, the kerosene pumping operation to the electric pump 4 is performed. To continue. On the other hand, when the liquid level of kerosene in the relay tank 2 has not reached the upper limit and the detection signal S2 is not output from the upper limit liquid level detector 8, the oil pump control panel 10 Judging that cracks etc. occurred in the middle of the pipe 3,
The operation of the electric pump 4 is immediately stopped. That is, the oil pump control panel 10 automatically monitors oil leaks in the pipe 3 and minimizes the flow of kerosene to the outside.

When the kerosene is supplied to the relay tank 2, the solenoid valves 27, 29 are normally closed, and the solenoid valves 19, 19a, 19b,... And the solenoid valves 23, 23a, 23b,.
… Is opened, and kerosene in door-to-door tanks 16 and 17 is
, Flows into the pipes 20, 24 via the solenoid valves 19, 19a, 19b, 23, 23a, 23b,.
a, 25, 25a,... At this time, the central monitoring panel
In 11 , the communication unit 32 controls the air conditioning terminals 21, 21a, 25, 25a,.
Communicates with any of the air conditioning terminals 21, 21a, 25, 25a,.
Is operating. And this communication part
Based on the information from 32, the operation unit 31
The total amount of kerosene supplied is calculated from the number of operating units a,..., and the data D1 is supplied to the arithmetic unit 33.
The total kerosene supply amount is calculated from the number of operating units 25, 25a,... And the data D2 is supplied to the calculation unit 34.

The calculation unit 33 measures the number of pulse signals of the detection signal S4 output from the flow meter 18 and calculates the actual supply amount of kerosene flowing through the pipe 20. Then, the calculated supply amount is compared with the supply amount of kerosene given by data D1, and the actual supply amount of kerosene measured by flow meter 18 is compared with the supply amount of kerosene given by data D1. If there is more than a certain level, it is determined that an oil leak has occurred in the middle of the pipe 20, and the solenoid valves 19, 19a, 19b,.
The solenoid valve 27 provided on 26 is opened. The operation unit 34
, The detection signal S4 output from the flow meter 22
The actual supply amount of kerosene flowing through the pipe 24 is calculated by measuring the number of pulse signals. Then, the calculated supply amount is compared with the supply amount of kerosene given by the data D2, and the actual supply amount of kerosene measured by the flow meter 22 is compared with the supply amount of kerosene given by the data D2. If there is more than a certain level, it is determined that an oil leak has occurred in the middle of the pipe 24, and each solenoid valve 2
... are closed, and the solenoid valve 29 provided in the pipe 28 is opened. Thus, pipes 20, 24
In the case where an oil leak occurs, the oil leakage is immediately detected and the solenoid valves 19, 19a, 19b,.
At the same time, the solenoid valves 27 and 29 are opened and the kerosene remaining in the pipes 20 and 24 is drained from the underground tank 1.
To minimize oil leakage to the outside.

As described above, when one solenoid valve 19, 23 is provided near the base end of each pipe 20, 24,
If an oil leak occurs in the middle of 24, kerosene remaining between the air conditioning terminals 21, 21a, 25, 25a, ... from the solenoid valves 19, 23 leaks out of the cracks in the pipes 20, 24. In the present embodiment, since a plurality of solenoid valves 19, 19a, 19b, 23, 23a, 23b,... Parts 33, 34
Control signals from the solenoid valves 19, 19a, 19b, 23, 23
a, 23b,... can be simultaneously closed to reduce the amount of oil leaking from the cracked portions of the pipes 20, 24 to the outside. That is, n solenoid valves 19, 19a, 19b,.
Is installed, the amount of oil leaking from the pipe 20 depends on the solenoid valve
19 is reduced to 1 / n that of a single installation. further,
As an effect on the embodiment, each air conditioning terminal 21, 21a, 25, 25
Since the pipes 26 and 28 are provided as return paths between the kerosene supply path a and the underground tank 1 via solenoid valves 27 and 29, oil leaks occur in the pipes 20 and 24. In this case, the oil remaining in the pipes 20, 24 can be quickly returned to the underground tank 1 by opening the solenoid valves 27, 29. These plural solenoid valves 19, 19a, 19b, 23, 23a, 23b,...
And pipes 26 and 28 provided with solenoid valves 27 and 29,
It is possible to minimize the amount of oil leaking from 0 and 24 to the outside.

[0015] According to the embodiment, whether the oil pump control panel 10, when the detection signal S3 from the flow meter 9 is output, and is immediately output the detection signal S2 from the upper liquid level detector 8 By judging this, it is possible to reliably detect oil leakage from the pipe 3. Therefore, even if an oil leak occurs due to a crack or the like in the pipe 3 from the storage tank 1 to the relay tank 2, the oil pump control panel 10 immediately stops the operation of the electric pump 4,
It is possible to minimize the leakage of kerosene from the pipe 3 to the outside.

The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention. For example, the flow meter 9 may be appropriately selected in consideration of the flow rate of kerosene flowing through the pipe 3 and the like. Further, the oil leak detection device according to the present invention can be applied to various facilities as well as schools and hospitals.

[0017]

According to the present invention, a kerosene storage tank, a relay tank which is connected to the storage tank and temporarily stores the kerosene from the storage tank, and a plurality of fuel oil fueled by the kerosene supplied from the relay tank are provided. Air- conditioning terminal and lights to the air-conditioning terminal
A plurality of solenoid valves provided in a kerosene supply path for supplying oil,
Detects the flow rate of kerosene flowing through the kerosene supply path and generates a detection signal.
From the output flow meter and the number of operating air conditioning terminals, the total
A calculation unit for calculating the amount of kerosene supplied;
The actual kerosene supply from the detected signal
The actual amount of kerosene supplied and the calculated value
With the total amount of kerosene supplied, and based on this comparison result
When a leak is detected, the solenoid valves are closed all at once.
Electromagnetic valve control means for closing, even if an oil leak occurs in the middle of the kerosene supply path to the air conditioning terminal, an air conditioning system capable of reducing the amount of oil leaking from the cracked portion to the outside. An oil leak detection device can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

[Explanation of symbols]

1 Underground tank (storage tank) 2 Relay tank 4 Electric pump (pump) 18, 24 Flow meter 19, 19a, 19b, 23, 23a, 23b Solenoid valve 20, 24 Piping (kerosene supply path) 21, 21a, 25, 25a Air-conditioning terminal 31 Computing units 33, 34 Computing unit (electromagnetic valve control means)

────────────────────────────────────────────────── ─── Continued from the front page (56) References JP-A-3-217708 (JP, A) JP-A-3-13708 (JP, A) JP-A-2-100040 (JP, U) (58) Field (Int.Cl. ⁶ , DB name) F23K 5/04 F23K 5/06 F23N 5/24 102

Claims (1)

(57) [Scope of request for utility model registration] 1. A storage tank for kerosene, a relay tank communicated with the storage tank and temporarily storing kerosene from the storage tank, and a plurality of air conditioning terminals using kerosene supplied from the relay tank as fuel. Supply kerosene to the air conditioning terminal
A plurality of solenoid valves provided in a kerosene supply passage,
A flow that detects the flow rate of kerosene flowing through the feed line and outputs a detection signal
Meter and the total number of kerosene supplied from the number of operating air conditioning terminals
And a detection signal output from the flow meter.
The actual amount of kerosene supplied is calculated from the
Kerosene supply amount and the total kerosene calculated by the calculation unit
Compare the amount supplied and check for oil leaks based on the comparison result.
A solenoid valve for closing the plurality of solenoid valves at the same time
An oil leak detection device for an air conditioning system, comprising: a control unit .