JPH0640640U - Oil leak detector for air conditioning system - Google Patents

Abstract

(57) [Summary] [Purpose] Even if an oil leak occurs in the communication passage to the relay tank, it is reliably detected and oil leakage to the outside is suppressed as much as possible. [Structure] In the pipe 3 between the underground tank 1 and the relay tank 2,
An electric pump 4 and a flow meter 9 are provided. Further, a lower limit liquid level detector 7 for detecting the liquid level of kerosene in the relay tank 2 and an upper limit liquid level detector 8 are provided. The flow meter 9 is the relay tank 2
When the preset flow rate is reached due to the rise in the liquid level of the kerosene therein, the detection signal S3 is output. At this time, if the detection signal S2 is not output from the upper limit liquid level detector 8, the operation of the electric pump 4 is stopped by the oil pump control panel 10.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an oil leak detection device for an air conditioning system using a plurality of air conditioning terminals for heating or cooling and heating.

[0002]

[Prior 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 the kerosene is installed from the storage tank to a rooftop by a pump. After being temporarily stored in a relay tank, kerosene is supplied from the relay tank to the doors for each door installed on each floor, and from each tank for tanks to supply kerosene to multiple air conditioning terminals for heating installed on each floor. I am trying to do it. Further, inside the relay tank, there is provided a liquid level detecting means for detecting whether or not the liquid level of kerosene stored in this relay tank has reached the upper limit and the lower limit, respectively. By controlling the pump on / off based on the detection signal, the amount of kerosene stored in the storage tank is automatically managed.

[0003]

[Problems to be solved by the device]

 In the above-described conventional air conditioning system, when the liquid level of kerosene in the relay tank reaches the upper limit, the pump operation stops due to the detection signal being output from the liquid level detection means, but from the storage tank to the relay tank. If an oil leak occurs due to a crack breakage in the middle of the communication passage, the liquid level of kerosene in the relay tank will not reach the upper limit, and the pump will continue to operate. In other words, unless a spot where the oil is actually leaked is visually detected, a large amount of oil leaks from the storage tank to the outside, so there is a risk of fire, environmental damage, and even treatment costs after the oil leaks. It was a factor that caused such.

Therefore, the present invention solves the above-mentioned problems, and even if an oil leak occurs in the middle of the communication path from the storage tank to the relay tank, it can be reliably detected to prevent the oil from leaking to the outside. An object of the present invention is to provide an oil leak detection device for an air conditioning system that can be suppressed as much as possible.

[0005]

[Means for Solving the Problems]

 The present invention relates to a kerosene storage tank, a relay tank connected to the storage tank for temporarily storing kerosene from the storage tank, and a plurality of air conditioning terminals that use kerosene supplied from the relay tank as fuel. A pump provided in a communication passage between the storage tank and the relay tank, liquid level detection means for respectively detecting whether or not the liquid level of kerosene stored in the relay tank has reached an upper limit and a lower limit, and the communication A flow meter that detects the flow rate of kerosene flowing through the passage and outputs a detection signal when the detected flow rate reaches or exceeds the set flow rate from the lower limit to the upper limit of the kerosene level in the relay tank; At the time when the detection signal from the meter is output, it is detected via the liquid level detection means whether or not the liquid level of kerosene in the relay tank has reached the upper limit, and based on this detection result, the pump Control movement Those having a kerosene leak detector for.

[0006]

[Action]

 With the above configuration, the flow meter detects the flow rate of kerosene flowing through the communication passage, and outputs a detection signal when the detected flow rate reaches or exceeds the set flow rate from the lower limit to the upper limit of the kerosene liquid level in the relay tank. To do. At this time, if the kerosene leak detection means has not reached the upper limit of the kerosene liquid level in the relay tank by the liquid level detection means, it is determined that an oil leak has occurred in the middle of the communication passage, and immediately Stop the pump operation to prevent oil leakage to the outside.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to FIG. In the figure, 1 is an underground tank that serves as a storage tank for storing a large amount of kerosene, and 2 is a relay tank that is connected to the underground tank 1 and is installed, for example, on the roof, and between the underground tank 1 and the relay tank 2. Is provided with a pipe 3 as a communication passage. Then, the kerosene from the underground tank 1 is pumped up by the electric pump 4, which is a pump provided in the middle of the pipe 3, and is temporarily stored in the relay tank 2. Further, another pipe 5 is connected between the underground tank 1 and the relay tank 2, and when the kerosene in the relay tank 2 becomes full, it is returned to the underground tank 1 through this pipe 5. . On the other hand, 6 is a liquid level detector as liquid level detection means provided inside the relay tank 2, and outputs a detection signal S1 when the liquid level of kerosene in the relay tank 2 reaches the lower limit. It is composed of a container 7 and an upper limit liquid level detector 8 which outputs a detection signal S2 when the liquid level of kerosene in the relay tank 2 reaches the upper limit. Further, a flow meter 9 for detecting the flow rate of kerosene flowing through the pipe 3 by measuring the number of pulse signals is provided between the underground tank 1 and the electric pump 4. In the flow meter 9, the flow rate of the kerosene liquid level 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. It is configured to output the detection signal S3 when it reaches. Then, the detection signal S3 from the flow meter 9 and the detection signals S1 and S2 from the liquid level detector 6 are respectively supplied to the oil pump control panel 10 having an arithmetic control unit as kerosene leak detection means, and the oil pump The control board 10 controls the operation of the electric pump 4 depending 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 informs the refueling indicator 12 provided on the central monitoring panel 11 of the completion of refueling when the relay tank 2 is fully distributed. Reference numeral 13 is an exhaust pipe provided above the relay tank 2.

The kerosene stored in the relay tank 2 is supplied to the individual tanks 16 and 17 provided for each floor via a pipe 15 provided with an emergency shutoff valve 14. Kerosene in the door-by-door tank 16 is supplied to each air conditioning terminal 21, 21a, ... Through a pipe 20 serving as a kerosene supply path provided with a flow meter 18 and a plurality of solenoid valves 19, 19a, 19b ,. It has become so. Further, the kerosene in the door-by-door tank 17 also has the same flow as the door-by-door tank 16 through the pipe 24 as a kerosene supply path provided with a flowmeter 22 and a plurality of solenoid valves 23, 23a, 23b, ... It is adapted to be supplied to the adjusting terminals 25, 25a, .... As the air conditioning terminals 21, 21a, 25, 25a, ..., There are air conditioning terminals for heating and air conditioning terminals for cooling and heating. The solenoid valves 19, 19a, 19b, ... And the solenoid valves 23, 23a, 23b, ... Are provided for each air conditioning terminal 21, 21a, 25, 25a ,. It can also be attached to a location. A pipe 26 as a return path is provided between the kerosene supply path of each air conditioning terminal 21, 21a ... Connected to the door-by-door tank 16 and the underground tank 1, and a shutoff solenoid valve 27 is provided in the middle of the pipe 26. It is arranged. Further, a pipe 28 as a return path is provided between the kerosene supply path of each air conditioning terminal 25, 25a, ... Connected to the door-by-door tank 17 and the underground tank 1, and a shutoff solenoid valve 29 is provided in the middle of the pipe 28. Is provided.

In addition to the refueling indicator 12, the central monitoring panel 11 is provided with a computing unit 31 and a communication unit 32. The communication unit 32 communicates with each of the air conditioning terminals 21, 21a, ... And each of the air conditioning terminals 25, 25a ,. Further, the arithmetic unit 31 calculates the total amount of kerosene supply from the number of operating air conditioning terminals 21, 21a, ... Based on the information from the communication unit 32, supplies the data D1 to the arithmetic unit 33, and The total amount of kerosene supply is calculated from the number of operating terminals 25, 25a, ..., And the data D 2 is supplied to the calculation unit 34. The calculation unit 33 controls opening / closing of the solenoid valves 19, 19a, 19b, ... And the solenoid valve 27 based on the comparison result of the pulse signal number of the detection signal S4 output from the flow meter 18 and the data D1. Similarly, the calculation unit 34 also determines the solenoid valves 23, 23a, 23b, ... And the solenoid valve 29 based on the comparison result between the pulse signal number of the detection signal S5 output from the flowmeter 22 and the data D2. Control the opening and closing of. When the flowmeters 18 and 22 and the flowmeter 9 have an accuracy of 10 CC / 1 pulse, for example, a flow rate of 1000 CC will generate 100 pulses.

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 the kerosene stored in the underground tank 1 to the relay tank 2. When the detection signal S1 is output from the lower limit liquid level detector 7 as the liquid level of kerosene in the relay tank 2 rises due to this series of operations, the oil pump control panel 10 connects the flow meter 9 to the pipe 3 The detection of the flow rate of kerosene flowing through is started. The flow meter 9 compares the preset flow rate of the kerosene liquid level in the relay tank 2 from the lower limit to the upper limit in advance with the actual kerosene flow rate flowing through the pipe 3 to determine that the kerosene flow rate in the pipe 3 is When the flow rate is equal to or more than the set flow rate, a detection signal S3 is output to the oil pump control panel 10, which causes the oil pump control panel 10 to immediately transmit the relay tank via the upper limit liquid level detector 8. Whether or not the liquid level of kerosene in 2 has reached the upper limit is detected based on the presence or absence of the detection signal S2. At this time, if the liquid level of 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 for 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 causes some cause. Therefore, it is determined that cracks and damage have occurred in the middle of the pipe 3, and the operation of the electric pump 4 is immediately stopped. That is, the oil pump control panel 10 automatically monitors the oil leakage in the pipe 3 to minimize the outflow of kerosene to the outside.

With the operation of supplying kerosene to the relay tank 2, normally, the solenoid valves 27, 29 are closed and the solenoid valves 19, 19a, 19b, ... And the solenoid valves 23, 23a, 23b ,. The kerosene in the individual tanks 16 and 17 flows into the pipes 20 and 24 through the flowmeters 18 and 22 and the solenoid valves 19, 19a, 19b, 23, 23a, 23b, ... , 21a, 25, 25a, ... At this time, in the central monitoring panel 8, the communication unit 32 communicates with each of the air conditioning terminals 21, 21a, 25, 25a, ... And detects which of the air conditioning terminals 21, 21a, 25, 25a ,. is doing. Then, based on the information from the communication unit 32, the calculation unit 31 calculates the total kerosene supply amount from the number of operating air-conditioning terminals 21, 21a, ... And supplies the data D1 to the calculation unit 33. The total amount of kerosene supply is calculated from the number of operating air conditioning terminals 25, 25a, ... And the data D2 is supplied to the arithmetic unit 34.

The arithmetic unit 33 measures the number of pulse signals of the detection signal S 4 output from the flow meter 18 to calculate the actual supply amount of kerosene flowing through the pipe 20. Then, the calculated supply amount and the supply amount of kerosene given by the data D1 are compared, and the actual supply amount of kerosene measured by the flowmeter 18 becomes the supply amount of kerosene given by the data D1. If there is more than a certain level, it is judged that oil has leaked in the middle of the pipe 20, and the solenoid valves 19, 19a, 19b, ... Then, the solenoid valve 27 provided in the pipe 26 is opened. The arithmetic unit 34 also counts the number of pulse signals of the detection signal S4 output from the flowmeter 22 to calculate the actual supply amount of kerosene flowing through the pipe 24. 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 flowmeter 22 is the supply amount of kerosene given by the data D2. On the other hand, if there is more than a certain level, it is judged that oil leakage has occurred in the middle of the pipe 24, and the solenoid valves 23, 23a, 23b, ... , Open the solenoid valve 29 installed in the pipe 28. In this way, when an oil leak occurs in the pipes 20 and 24, it is immediately detected and the solenoid valves 19, 19a, 19b, ... Or the solenoid valves 23, 23a, 23b ,. By opening the valves 27 and 29 and returning the kerosene remaining in the pipes 20 and 24 to the underground tank 1, the leakage of oil to the outside is minimized.

As described above, according to the above-described embodiment, the oil pump control panel 10 immediately outputs the detection signal S2 from the upper limit liquid level detector 8 when the detection signal S3 is output from the flowmeter 9. By determining whether or not the oil is leaked, it is possible to reliably detect the oil leak in the pipe 3. Therefore, even if an oil leak occurs due to crack breakage or the like in the middle of 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, so that the pipe 3 It is possible to minimize the leakage of kerosene from the outside.

Further, as an effect of the embodiment, when one electromagnetic valve 19 and 23 are provided near the base ends of the pipes 20 and 24, respectively, when oil leak occurs in the middle of the pipes 20 and 24, The kerosene remaining between the valves 19 and 23 and the respective air conditioning terminals 21, 21a, 25, 25a, ... Has the drawback that all of the kerosene leaks out from the cracked portions of the pipes 20 and 24. However, in the present embodiment, Since a plurality of solenoid valves 19, 19a, 19b, 23, 23a, 23b, ... Are arranged in each of the pipes 20 and 24, when oil leaks in the pipes 20 and 24, each of them is controlled by a control signal from the arithmetic units 33 and 34. The solenoid valves 19, 19a, 19b, 23, 23a, 23b, ... Can be closed at once to reduce the amount of oil leaking from the cracked portions of the pipes 20, 24 to the outside. That is, when n solenoid valves 19, 19a, 19b, ... Are attached to the pipe 20, the amount of oil leaking from the pipe 20 is reduced to 1 / n of the case where a single solenoid valve 19 is attached. To do. Further, since the kerosene supply paths of the air conditioning terminals 21, 21a, 25, 25a, ... And the underground tank 1 are provided with pipes 26, 28 as return paths via electromagnetic valves 27, 29, respectively. When oil leaks occur in the pipes 20 and 24, the solenoid valves 27 and 29 can be opened to quickly return the oil remaining in the pipes 20 and 24 to the underground tank 1 side. These plural solenoid valves 19, 19a, 19b, 23, 23a, 23b, ... And the pipes 26, 28 equipped with the solenoid valves 27, 29 minimize the amount of oil leaking from the pipes 20, 24 to the outside. Can be reduced to.

The present invention is not limited to the above 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. Further, the oil leakage detection device according to the present invention can be applied not only to schools and hospitals but also to various facilities.

[0016]

[Effect of device]

 The present invention relates to a kerosene storage tank, a relay tank that communicates with the storage tank and temporarily stores the kerosene from the storage tank, and a plurality of air conditioning terminals that use kerosene supplied from the relay tank as fuel. A pump provided in a communication passage between the storage tank and the relay tank, liquid level detection means for respectively detecting whether or not the liquid level of kerosene stored in the relay tank has reached an upper limit and a lower limit, and the communication A flow meter that detects the flow rate of kerosene flowing through the passage and outputs a detection signal when the detected flow rate reaches or exceeds the set flow rate from the lower limit to the upper limit of the kerosene level in the relay tank; At the time when the detection signal from the meter is output, it is detected via the liquid level detection means whether or not the liquid level of kerosene in the relay tank has reached the upper limit, and based on this detection result, the pump Control movement Even if an oil leak occurs in the communication path from the storage tank to the relay tank, it will be reliably detected and the leakage of oil to the outside will be suppressed as much as possible. It is possible to provide an oil leak detection device for an air conditioning system that is capable of doing so.

[Brief description of 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) 6 Liquid level detector (liquid level detection means) 9 Flowmeter 10 Oil pump control panel (kerosene leak detection means) 21, 21a, 25, 25a Air conditioning terminal

Claims (1)

[Scope of utility model registration request] 1. A kerosene storage tank, a relay tank communicating with the storage tank for temporarily storing kerosene from the storage tank, and a plurality of air conditioning terminals using kerosene supplied from the relay tank as fuel. A pump provided in a communication passage between the storage tank and the relay tank, liquid level detection means for detecting whether or not the liquid level of kerosene stored in the relay tank has reached an upper limit and a lower limit, respectively, A flow meter that detects the flow rate of kerosene flowing through the communication passage and outputs a detection signal when the detected flow rate reaches or exceeds the set flow rate from the lower limit to the upper limit of the liquid level of kerosene in the relay tank, and Detecting whether or not the liquid level of kerosene in the relay tank has reached the upper limit via the liquid level detecting means at the time when the detection signal from the flow meter is output, and based on this detection result, the pump Control movement An oil leak detection device for an air conditioning system, comprising: kerosene leak detection means.