JPH05133650A - Leakage liquid detector for air conditioning equipment - Google Patents

Abstract

PURPOSE:To improve reliability of detecting leakage liquid by forming an expansion tank in an open type, providing a flow sensor for detecting abnormal flowout of heat medium liquid to a circulation passage, and outputting a leakage liquid signal when the detection is continued for a predetermined time. CONSTITUTION:An expansion tank 2 is formed in an open type. A flow sensor Fs for detecting flowout of a set flow rate or more of heat medium water from the tank 2 to a circulation passage 1 is provided. Leakage liquid detecting means 6 inputs a detection signal of the medium water to be output from the sensor Fs to deciding means 7 to operate a timer. If the detection of the sensor Fs is continued for a set time of the timer, a discriminator 8 judges liquid leakage, outputs a leakage water inform signal to a monitor 11 through a leakage water informing unit 12A, and lights a warning lamp 10A. Simultaneously, it is informed as an entire checker CA to a close instruction unit 13. A supply control valve V1 is closed through a valve controller 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a heat medium liquid circulation path, and a forward path for sending the heat medium liquid from the circulation path to the air conditioner and a return path for returning the heat medium liquid from the air conditioner to the circulation path. The present invention relates to a liquid leakage detection device for an air conditioning facility, wherein a terminal path provided with is connected to the circulation path and an expansion tank is connected to the circulation path.

[0002]

2. Description of the Related Art Conventionally, in a circulation path and a terminal path, a location where leakage is considered to occur, such as between pipes or a connection between a pipe and a device (such as a heat exchanger of a pump or an air conditioner). An electrode-type or float-type liquid detection sensor for detecting the leaked liquid was provided on the outside of the to detect the liquid leak.

[0003]

However, according to the above-mentioned conventional technique, in order to increase the accuracy of the leak detection, it is necessary to install the liquid detection sensors at all the places where the leak is likely to occur. Therefore, the cost is high, and depending on the installation situation of the pipe, it may be difficult or impossible to install the liquid detection sensor at all the locations where liquid leakage is likely to occur. It is not possible to deal with leaks at locations other than where leaks are likely to occur. In short, according to the conventional technique, although the cost is high, the reliability of the leak detection is poor. An object of the present invention is to perform highly reliable leak detection at low cost.

[0004]

One of the features of the leak detecting device for an air conditioner according to the present invention is that when the presence or absence of an abnormal flow of a heat transfer liquid from the expansion tank to the circulation path is detected and detected. A leak detecting means for outputting a leak signal is provided at the point.

The second feature of the leak detection device for an air conditioner according to the present invention is the leak detection device according to the first feature, wherein an open type expansion tank is provided as the expansion tank to expand the expansion tank. A flow sensor that detects the presence or absence of outflow of the heat transfer liquid from the tank to the circulation path at a set flow rate or more, and a determination unit that outputs a leak signal when the detection state of the flow sensor is continued for a set time. Is provided.

The third feature of the leak detecting device for an air conditioner according to the present invention is the leak detecting device according to the first feature of the present invention, wherein the leak detecting means is provided with a closed type expansion tank, and the expansion tank expands. A gas pressure sensor that detects the gas pressure in the tank is provided, and a determination unit that outputs a leak signal when the gas pressure detected by the gas pressure sensor falls below the set gas pressure within a set time is provided. is there.

The fourth feature of the liquid leakage detection device for an air conditioner according to the present invention is that an on-off valve is provided in each of the forward path and the return path of the terminal path near the connection to the circulation path, and A valve detecting means is provided for detecting the pressure of the on-off valve, and a valve control means is provided for keeping the on-off valve closed and set for each set detection time for a set operation time shorter than the set detection time. In this state, there is provided a liquid leakage determining means for outputting a liquid leakage signal when the pressure detected by the pressure detecting means falls below a set pressure.

The fifth feature of the leak detecting device for an air conditioner according to the present invention is that of the leak detecting device for an air conditioner having the features of 1, 2, or 3 and the air conditioner having the feature of 4. A leak detection device is provided.

[0009]

[Operation] Normally, in an air conditioning facility equipped with a circulation path and a terminal path,
Since the expansion tank is connected to the circulation path, the heat transfer fluid moves back and forth between the expansion tank and the circulation path due to expansion and contraction of the heat transfer fluid due to heat, but this is performed very slowly. On the other hand, when liquid leakage occurs from the circulation path, terminal path, and equipment connected to them (hereinafter, these are collectively referred to as the piping system), the leakage occurs at any point in the piping system. However, the heat transfer liquid continues to flow from the expansion tank to the circulation path until it stops leaking, and it is completely different from the normal movements associated with expansion and contraction, and is clearly distinguished from it. Can cause abnormal outflow.
Then, if an abnormal outflow occurs, if the expansion tank is an open type, the flow of the heat transfer liquid from the expansion tank to the circulation path at a flow rate according to the leak flow rate occurs, while if it is a closed type, A pressure drop occurs in the expansion tank.

Therefore, according to the first feature, when there is an abnormal outflow, it is detected and a leak signal is output, so that no matter where the leak occurs in the piping system, the expansion tank The leakage liquid can be surely known by outputting the leakage signal only by monitoring the outflow situation of the heat transfer liquid from the to the circulation path at one place.

According to the second characteristic, although the flow sensor is normally in a non-detection state because there is no flow of the heat transfer liquid from the expansion tank to the circulation path, when the above-mentioned abnormal outflow occurs, When the flow sensor is in the detection state due to the flow above the set flow rate, and the detection state continues for the set time, a leak signal is output, so the leak sensor can be detected anywhere in the piping system. Even if occurs, the leakage can be surely known by the output of the leakage signal only by monitoring the flow of the heat transfer liquid from the expansion tank to the circulation path with one flow sensor.

According to the third feature, the gas pressure sensor is normally in the non-detection state because there is no decrease in the pressure in the expansion tank due to no outflow of the heat transfer liquid from the expansion tank to the circulation path. If there is an abnormal outflow, the gas pressure detected by the gas pressure sensor will drop below the set gas pressure within the set time, and a leak signal will be output. Even if liquid leakage occurs, it is possible to know the liquid leakage surely by outputting the liquid leakage signal only by monitoring the outflow state of the heat transfer liquid from the expansion tank to the circulation path with one gas pressure sensor. Moreover, even if the amount of the heat transfer liquid flowing from the expansion tank to the circulation path is small, the pressure inside the expansion tank is sensitively decreased, so that a slight leak can be detected.

According to the fourth feature, the on-off valves provided on each of the forward path and the return path are kept closed to keep the pressure in the terminal path low when there is no liquid leakage. However, if liquid leakage occurs, a pressure drop will occur.Therefore, by setting the set detection time and set operating time appropriately, it is only necessary to monitor the pressure in the terminal line and Leakage can be detected. According to the fifth feature, it is possible to detect the leak of the entire piping system and the leak of each terminal line.

[0014]

As described above, according to the present invention, a leak detecting device, which is an open type leak detecting device, which can detect the leak of a highly reliable whole piping system at low cost, for an air conditioning facility provided with an expansion tank, is provided. Highly reliable targeting air conditioners with expansion tanks Leakage detectors that can detect leaks in the entire piping system at low cost, and reliable targeting air conditioners with closed expansion tanks Liquid leakage detection device that can detect liquid leakage of the entire piping system at low cost, liquid leakage detection device that can perform liquid leakage detection of individual terminal lines with high reliability, high reliability It has become possible to provide a liquid leakage detection device that can perform liquid leakage detection of the entire piping system and individual terminal paths at low cost.

[0015]

【Example】

[Embodiment 1] As shown in FIG. 2, the air conditioning equipment is provided with a circulation passage 1 of a heat medium water which is an example of a heat medium liquid, and the circulation passage 1 is provided with
The expansion tank 2 and a plurality of terminal paths 3 are connected to each other, and a total water leakage (liquid) detection device A for the entire piping system including the circulation path 1 and the terminal paths 3 and each terminal path 3 are targeted. And a water leakage (liquid) detection device B for the terminal. The circulation path 1 includes a circulation pump 1P and a heat source 1S that cools and heats heat transfer water. The terminal path 3 is a forward path 3A that sends the heat transfer water from the circulation outward path 1A to the air conditioner 4 in the circulation path 1, and a return path that sends the heat transfer water from the air conditioner 4 to the circulation return path 1B in the circulation path 1. 3B and. The air conditioner 4 is a fan coil unit or an air handling unit that heats heat transfer water and air for air conditioning to generate cold air or warm air. A plurality of air conditioners are connected in parallel to one terminal path 3. There is. Reference numeral 5 is a valve that controls the supply of heat transfer water to each air conditioner 4. The air conditioner 4 is
A heat pump using heat transfer water as a heat source may be provided. Therefore, the air conditioning equipment is configured to perform cooling by cooling the heat transfer water with the heat source 1S and to perform heating by heating. As shown in FIG. 1, the water leakage detection device A for the whole detects the presence or absence of an outflow abnormality of the heat transfer water from the expansion tank 2 to the circulation path 1 and outputs a water leakage signal when it is detected. The water leak detection means 6 is provided. The water leakage detection means 6 is provided with an open type as the expansion tank 2, and a flow sensor FS for detecting the presence or absence of outflow of the heat transfer water from the expansion tank 2 to the circulation path 1 at a set flow rate or more, and The flow sensor FS is configured to include a determination unit 7 that outputs a water leak signal when the presence state of the flow sensor FS is continued for the set time T0. A water supply passage 2B is connected to the expansion tank 2 via a ball tap valve 2A for controlling water supply so as to maintain a constant water level in the tank, and the flow sensor FS supplies a replenishment from the expansion tank 2 to the circulation passage 1. Outflow of heat transfer water through the passage 2C, that is,
It is provided in the water supply passage 2B, paying attention to the fact that water is supplied from the water supply passage 2B to the expansion tank 2 in response to the water supply and the water supply is compatible with the supply water. It consists of a flow switch that turns on. The determination means 7 is provided with a timer TM0 which starts time counting when the flow switch FS is detected (ON) and stops time counting when the flow switch FS is turned off, and the time counting time t0 by the timer TM0 is the set time T0. When it becomes, the determination unit 8 that outputs a water leak signal is provided. Examples of specific numerical values of the set time T0 include 0 to 30 minutes. And the leak detector A for the whole
Is a valve control unit 9 that closes the replenishment control valve V1 provided in the replenishment path 2C when a water leakage signal from the determination unit 8 is input, and an alarm lamp that operates based on the water leakage signal from the determination unit 8. 10A and a water leakage notification unit 12A that outputs a water leakage notification signal to the monitoring panel 11 based on the water leakage signal from the determination unit 8
And a valve closing command unit 13 that outputs a valve closing signal to the water leakage detection device B for the terminal based on the water leakage signal from the determination unit 8. The timer TM0, the determination unit 8, the valve control unit 9, the alarm lamp 10A, the water leakage notification unit 12A, and the valve closing instruction unit 13 are configured as one whole checker CA. An example of the specific configuration and operation of the water leakage detection device A for the whole will be described below with reference to the sequence circuits and flowcharts shown in FIGS. The replenishment control valve V1
Is a motor-operated valve that opens when current is applied between Ro and closes when current is applied between Rc. The reset relay X0 is energized by turning on any of the reset external terminal ROT, the device on / off switch SS, and the reset switch RS, and the normally closed contact x0 of the reset relay X0 is turned off, so that the timer TM
When 0 is reset, the first relay X1 is de-energized, and the normally open contact x1 of the first relay X1 is turned off, so that the second relay X2 is de-energized and the second relay X2 is de-energized.
When the normally open contact x2 of the relay X2 is turned off, the alarm lamp 1
0A, the water leakage notification unit 12A, the valve closing command unit 13 are reset, and the normally closed contact x2 of the second relay X2 is turned on, so that R-
Power is supplied between o and the supply control valve V1 is opened. While waiting in the above state, if water leakage occurs,
The flow switch FS turns on, and this flow switch FS
Is turned on, the timer TM0 starts counting time. Then, when the measured time t0 of the timer TM0 reaches the set time T0, the contact tm0 of the timer TM0 is turned on, and the contact tm0 is turned on so that the first relay X1 is energized and the normally open contact of the first relay X1 is turned on. By turning on x1,
While the first relay X1 maintains its own energized state, the second relay X2 is energized, and the normally open contact x2 of the second relay X2 is turned on to energize between R and C to close the replenishment control valve V1. At the same time, the alarm lamp 10A, the water leak notification unit 12A, and the valve closing command unit 13 are activated. In the flow chart, the alarm lamp 10A, the water leak notification unit 12A,
The operation of the valve closing command unit 13 is referred to as a water leak notification. As shown in FIG. 5, the water leak detection device B for the terminal is provided with opening / closing valves VA and VB in the forward path 3A and the return path 3B of the terminal path 3 near the connection to the circulation path 1, respectively. , A valve control for providing pressure detecting means 14 for detecting the pressure in the terminal passage 3 and for closing and holding the on-off valves VA and VB for each set detection time T1 for a set operating time T2 shorter than the set detection time T1. Means 15 are provided for the on-off valves VA, VB
When the pressure is detected by the pressure detecting means 14 drops below the set pressure P in the closed state, the water leak determining means 16 outputs a leak signal. Examples of specific numerical values of the set detection time T1 are 1 to 12 hours, and set operating time T2 is 0 to 30 minutes. And the water leakage detection device B for the terminal is
An alarm lamp 10B that operates based on a water leak signal from the water leak determination unit 16 and a water leak notification unit 12B are provided. In the water leakage notification unit 12B, a water leakage notification signal is output to the monitoring panel 11 based on the water leakage signal from the water leakage determination means 16, and a water leakage notification signal is output based on the water leakage signal from the water leakage determination means 16. There is. The pressure detecting means 14 is configured by providing pressure switches PA and PB at a location downstream of the on-off valve VA in the forward path 3A and at a location upstream of the on-off valve VB in the return path 3B. .. The valve control means 15 outputs a valve closing signal every time the measured time t1 reaches the set detection time T1.
The valve control unit 15A includes M1, a second timer TM2 that outputs a valve opening signal when the measured time t2 reaches the set operation time T2. The valve control unit 15A activates the second timer TM2 when the valve closing signal from the first timer TM1 is input, and
When the opening / closing valves VA and VB are closed and the valve opening signal from the second timer TM2 is input, the opening / closing valves VA and VB are opened and the valve closing signal from the water leakage determining means 16 is input. In addition, the opening / closing valves VA and VB are closed prior to the valve opening signal from the second timer TM2, and the closing notification signal is output when the opening / closing valves VA and VB are closed. The water leakage determination means 16 is operated under the condition that the valve closing notification signal from the valve control means 15 is input.
When the detected pressure p of either A or PB drops below the set pressure P, a water leakage signal is output and a valve closing signal is output to the valve control means 15, so that the overall water leakage detection device A outputs The valve control means 1 when a valve closing signal is input
A valve closing signal is output to 5. Further, the valve control means 15, the water leak determination means 16, the alarm lamp 10B, and the water leak notification section 12B are configured as one terminal checker CB. An example of the specific configuration and operation of the water leakage detection device B for this terminal will be described below based on the sequence circuits and flowcharts shown in FIGS. 6, 7 and 8. The on-off valves VA and VB are opened by energization between Ro and R, respectively.
It is a motor-operated valve that closes when electricity is applied between -c.
The open / close valve VA of the first valve and the open / close valve VB of the return path 3B
Are referred to as second valves, respectively. Reset external terminal ROT,
When either the device on / off switch SS or the reset switch RS is turned on, the reset relay X0 is energized,
By turning off the normally closed contact x0 of the reset relay X0,
The first timer TM1 and the timing timer TX are reset, and the first relay X1, the second relay X2, and the fourth relay X4 are turned off. When the normally closed contact x1 of the first relay X1 is turned on, the second valve VB is energized by energizing the second valve VB between Ro and the normally closed contact x2 of the second relay X2 is turned on. As a result, the first valve VA is energized between Ro and the first valve VA is opened, and the normally open contact x2 of the second relay X2 is turned off, whereby the second timer TM2 is reset and the first timer TM2 is reset. When the normally open contacts x1 and x2 of the relay X1 and the second relay X2 are turned off, the fourth relay X4 becomes non-energized, and the fourth relay X4.
The alarm lamp 10B and the water leak notification unit 12B are reset by turning off the normally open contact x4. After resetting in the above state, the measured time t1 of the first timer TM1 is the set detection time T
When it becomes 1, the contact tm1 of the first timer TM1 is turned on, and by the contact tm1 being turned on, the first relay X1 is energized, and the first timer TX starts timing, and the first relay X1 is turned on. When the normally open contact x1 is turned on, the first
While the relay X1 maintains the energized state by itself, the R-c of the second valve VB is energized to close the second valve VB, while
When the measured time xt of the first timer TX reaches the set time XT, the contact tx turns on and the second relay X2 is energized,
By turning on the normally open contact x2 of the second relay X2,
The relay X2 maintains the energized state by itself, the Rc of the first valve VA is energized to close the first valve VA, and
The second timer TM2 starts measuring the time, and the first relay X1,
When one of the pressure switches PA and PB is turned on by turning on the normally open contacts x1 and x2 of the second relay X2, a fourth
The relay X4 is ready to be energized. That is, the second
The first valve VA is adapted to be closed after the set time XT has elapsed since the valve VB was closed. Then, when water leakage does not occur in the terminal path 3, in the above-described state, that is, the time t2 of the second timer TM2 is the set time T.
When the contact tm2 becomes 2 and the contact tm2 is turned on, the third contact
The relay X3 is energized, and its normally closed contact x3 is turned off, so that the first relay X1 and the second relay X2 are de-energized, and the normally closed contact x1 of the first relay X1 is turned on. When the timer TM1 of the second valve VB is reset, the second valve VB is energized to open the second valve VB, and the normally-closed contact x2 of the second relay X2 is turned on.
The valve VA is energized between Ro and the first valve VA opens, and the second valve VA opens.
When the normally open contact x2 of the relay X2 is turned off, the second timer TM2 is reset and the above-mentioned state is released. On the other hand, when water leakage occurs in the terminal path 3, at least one of the pressure switches PA and PB is turned on before the time t2 of the second timer TM2 reaches the set time T2, and the pressure switch PA, When PB turns on, the 4th relay X4
Is energized, and the normally open contact x4 of the fourth relay X4
Is turned on, the fourth relay X4 keeps the energized state by itself, the alarm lamp 10B and the water leak notifying section 12B are activated, and the set time T2 has passed and the third relay X3 is energized. Regardless of the closing contact x3 being turned off, the energized state of the first relay X1 and the second relay X2 is maintained, and the closed state of the first valve VA and the second valve VB is maintained. Moreover, when the valve closing signal is input from the water leakage detection device A for the whole after resetting, the contact x is turned on by the input, and the fifth relay X5 is energized.
When the normally open contact x5 is turned on, the first relay X1 and the second relay X2 are energized in priority to the others, and when the normally open contacts x1 and x2 are turned on, the first valve VA and the second valve V are turned on.
Each of B and R-c is energized to simultaneously close the first valve VA and the second valve VB. In the flowchart, the operations of the alarm lamp 10B and the water leak notification unit 12B are described as water leak notification.

[Embodiment 2] In Embodiment 1, the water leakage detecting means 6 of the water leakage detecting device A for the whole is constructed as follows. As shown in FIGS. 9 and 10, the water leakage detecting means 6 is provided with a closed type as the expansion tank 2, and a gas pressure sensor GP for detecting the gas pressure in the expansion tank 2 is provided. GP detection gas pressure gp
Is provided with a determination means 17 which outputs a water leak signal when the pressure falls below the set gas pressure gP within the set time gT. Moreover, the gas supply path 1 with the on-off valve V2 for supplying gas so as to pressurize the inside of the expansion tank 2 to the set gas pressure gP.
Eight. The gas pressure sensor GP is a pressure switch that is turned on when the detected gas pressure gp drops below the set gas pressure gP. The determination means 17 measures the time t1.
First outputs a detection signal every time the set detection time T1 is reached
Of the timer TM1, a second timer TM2 for starting time measurement when a detection signal is input from the timer TM1, and a determination unit 19. The determination unit 19 closes the opening / closing valve V2 when the detection signal from the first timer TM1 is input, and the pressure switch G2 is closed when the opening / closing valve V2 is closed.
When P turns on, a water leak signal is output and the second timer T
The opening / closing valve V2 is opened when the measured time t2 of M2 reaches the set operation time T2. Specific numerical examples of the set detection time T1 and the set operating time T2 include 1 to 12 hours and 0 to 30 minutes, respectively.
In addition, the water leakage detection device A for the whole of the alarm lamp 10 similarly operates based on the water leakage signal from the determination unit 19.
A and the monitoring board 11 based on the leak signal from the determination unit 19
A water leakage notification unit 12A that outputs a water leakage notification signal, and a valve closing command unit 13 that outputs a valve closing signal to the water leakage detection device A for the terminal based on the water leakage signal from the determination unit 19. An example of the specific configuration and operation of the water leakage detection apparatus A for the whole will be described below based on the sequence circuits and flowcharts shown in FIGS. The on-off valve V2 is
It is a motor-operated valve that opens by energizing between Ro and o and closes by energizing between R and c. The reset relay X0 is energized by turning on any of the reset external terminal ROT, the device on / off switch SS, and the reset switch RS, and the normally-closed contact x0 of the reset relay X0 is turned off, whereby the first relay X1 is turned on.
Is de-energized and the normally open contact x of the first relay X1
When 1 is turned off, the first timer TM1 is reset,
When the contact tm1 of the first timer TM1 is turned off, the second relay X2 is turned off, and the second timer TM2 is reset. When the normally closed contact x0 of the reset relay X0 is turned off, the third relay X3 is turned off. Is de-energized and the normally open contact x3 of the third relay X3 is turned off,
Alarm lamp 10A, water leak notification unit 12A, valve closing command unit 13
Is reset and the normally closed contact x2 of the second relay X2 is turned on to energize between Ro and open / close the valve V2. After resetting in the above state, the time t of the first timer TM1 is counted.
1 becomes the set detection time T1, the first timer TM
When the contact tm1 of No. 1 is turned on and the contact tm1 is turned on, the second relay X2 is energized, and the second timer TM2 starts timing, and the normally open contact x2 of the second relay X2 is turned on. When the on-off valve V2 is closed by energizing between the R-c of the on-off valve V2 and water leakage occurs and the pressure switch GP is turned on, the third relay X3 is in a state of being energized. Then, when the water leakage does not occur, the first relay X1 operates in the above-described state, that is, the time t2 of the second timer TM2 becomes the set operation time T2 and the contact tm2 is turned off. When the normally open contact x1 is turned off, the first timer T
M1 is reset, and similarly to the above, the contact tm1 of the first timer TM1 is turned off, so that the second relay X2 is de-energized and the second timer TM2 is reset and the second relay X2 is reset. When the normally-closed contact x2 is turned on, a current is applied between Ro and the on-off valve V2 is opened. On the other hand,
If water leakage has occurred, the pressure switch GP is set before the time t2 of the second timer TM2 reaches the set time T2.
When the pressure switch GP is turned on, the third relay X3 is energized. When the normally open contact x3 of the third relay X3 is turned on, the third relay X3 keeps the energized state by itself and the alarm lamp 10A, water leak notification unit 1
2A, the valve closing command unit 13 operates.

[Third Embodiment] In the first embodiment, as shown in FIG. 13, the whole checkers CA are not individually provided and the terminal checkers CB are not provided in each of the terminal paths 3, but they are integrated into one. It is configured as a checker C. The integrated checker C determines whether or not there is water leakage in each of a plurality (n) of terminal paths 3 at every set detection time T1.
The inspection is performed in order from the second item to the nth item, and includes an overall check unit and a terminal check unit. As shown in FIGS. 14 and 15, the overall check unit has a function similar to that of the overall checker CA, and the terminal check unit performs the setting detection time T1 as shown in FIGS. Each time, it consists of a check request unit that requests a terminal leak check, a check unit that performs a leak check in response to the request, and a monitoring / display unit that monitors them and displays the results thereof. An example of those specific configurations and operations will be described below based on the sequence circuits and flowcharts shown in FIGS. The replenishment control valve V1 is an electric valve that opens by energizing between Ro and closes by energizing between Rc, as in the first embodiment, and is the first valve of each terminal passage 3. VA, second valve VB
Is a motor-operated valve that opens by energizing between R _{0 and} o and closes by energizing between R _{0 and} c, and when it is necessary to distinguish each terminal path 3 and its associated components such as the first valve VA. In order to make the distinction easy, for example, in the case of the first valve VA, 1
The first 1st valve VA is 1VA, the 2nd second valve VA is 2V
Symbols 1 to n are added to indicate that the A-th and n-th first valves VA are nVA. [Overall Check Unit] Reset The reset relay X0 is energized by turning on any of the external terminal ROT, the checker ON / OFF switch CS, and the reset switch RS, and the timer TM0 is reset by turning off the normally closed contact x0 of the reset relay X0. At the same time, the first relay X1 is turned off, and the normally open contact x1 of the first relay X1 is turned on.
Is turned off, the second relay X2 is turned off, and the normally open contact x2 of the second relay X2 is turned off to reset the main alarm lamp 10 and the water leakage notification unit 12, and the normally closed contact x1 of the first relay X1. By turning on, the supply control valve V1 is opened by energizing between Ro and o, and the first valve VA and the second valve VB are all opened by energizing during _R0- o. While waiting in the above-described state, when water leaks in the areas other than the terminal path 3, the flow switch FS is turned on, and the timer TM0 starts counting time when the flow switch FS is turned on. Then, when the measured time t0 of the timer TM0 reaches the set time T0, the contact tm0 of the timer TM0 is turned on,
When the contact tm0 is turned on, the first relay X1 is energized, and when the normally open contact x1 of the first relay X1 is turned on, the first relay X1 maintains the energized state by itself, and the relays R-c and R _0. -C is energized, the replenishment control valve V and all the first valves VA and the second valves VB are closed, and the second valve
When the relay X2 is energized and the normally-open contact x2 of the second relay X2 is turned on, the main alarm lamp 10 and the water leak notification unit 12 are activated. [Terminal Check Unit] [Reset] Reset Either the external terminal ROT or the reset switch RS is turned on to turn on the reset relay X00, and the normally-closed contact x00 of the reset relay X00 is turned off to correspond to each terminal path 3. When the second relays 1X2 to nX2 are in the non-energized state and the normally closed contacts 1x2 to nx2 of the second relays 1X2 to nX2 are turned on, all of the first valve VA and the second valve VB between R _{0 and} o are connected. All the first valves VA and the second valves VB are opened by energization, and the normally-open contacts 1x2 to nx2 of the second relays 1X2 to nX2 are turned off, so that all the terminal warning lamps 10B and the water leak notification unit 12B.
Is reset. After that, when the measured time t1 of the first timer TT1 reaches the set detection time T1, the normally closed contact tt1 of the first timer TT1 is temporarily turned off, and the normally closed contact tt1 is temporarily turned off. First timer T
T1 and the second timer TT2 are reset to start time measurement, and the normally-closed contact tt1 of the first timer TT1 is temporarily turned on, whereby the counters 1C to nC are reset and the normally-closed contacts of the counters 1C to nC are reset. 1c to nc are turned off, and the normally-closed contacts 1c to nc are turned off, so that the first relays 1X1 to nX1 corresponding to each terminal path 3 are de-energized,
By temporarily turning off the normally closed contact tt2 of the second timer TT2, the first timer TX1 for timing is reset to start timing, and at the same time, the terminal second relay X02.
Is de-energized and the normally open contact x02 of the terminal second relay X02 is turned off, so that the second timer T for timing is turned on.
X2 is reset. [Actuation request] Then, by turning on the normally open contact tx1 of the first timer TX1 for a preset time (about 1 second),
The 1st Cow Uta 1C is set and its counter 1C
When the normally closed contact 1c is turned on, the first relay 1X1 is energized, and the normally open contact 1x of the first relay 1X1 is turned on.
When 1 is turned on, the first pressure switch 1PA, 1PB
The terminal fifth relay X05 can be energized only when is turned on, and the normally open contact 1x1 of the first relay 1X1 and the normally open contact tx1 of the first timer TX1 are turned on to turn on the terminal first relay. X01 is energized, and the check unit is required to perform a check operation for the first terminal path 3. [Check] By a check operation request, that is, when the normally open contact x01 of the first terminal relay X01 is turned on, the second terminal relay X02 is turned on, and the normally open contact x02 of the second terminal relay X02 is turned on. When the third terminal relay X03 is energized, the second timer TX2 for timing starts timing, and the normally open contact 1x1 of the first relay 1X1 and the normally open contact x of the third terminal relay X03 x
When 03 is turned on, the first second valve 1VB is energized between R _{0 and} c to close the first second valve 1VB, and the set time (20) of the normally open contact tx2 of the second timer TX2 is set. After the time is turned on, the terminal fourth relay X04 is energized, and its normally open contact x04 and the first relay 1X are turned on.
When the normally open contact 1x1 of 1 is turned on, the first first valve 1V
A current is applied between R _{0 and} c of A, and the first first valve 1VA is closed. When there is no water leakage in the terminal path 3, when neither the pressure switch 1PA or 1PB is turned on in that state and the time t2 of the second timer TT2 reaches the set operation time T2, the second Normally closed contact t of timer TT2
Due to the temporary turning off of t2, the second timer TT2, the first timer
The timer TX1 is reset to start clocking, the terminal second relay X02 is de-energized and the second timer TX2 is reset, and the normally open contact tx2 of the second timer TX2 is turned off as described above. R ₀ of the first valve 1VA of
The first first valve 1VA is opened by energizing between o and the normally closed contact tt2 of the second timer TT2 is temporarily turned off, so that the terminal third relay X03 becomes non-energized and its normally open state. When the contact point x03 is turned off, the first second valve 1VB is energized between R _{0 and} o, the first second valve 1VB is opened, and the check operation for the second terminal line 3 is required. That is, the following [1] and [2] are repeated until i = n, and the process waits until the timed time tt1 of the first timer TT1 reaches the set detection time TT1. [1] When the normally open contact tx1 of the first timer TX1 is turned on, the i-th cowout iC is set, and when the normally closed contact ic of the counter iC is turned on, the first relay iX1 is turned on.
Is energized, and the normally open contact ix1 of the first relay iX1 is turned on, so that the i-th pressure switch iPA, i
Only when the PB is turned on, the terminal fifth relay X05 can be energized, and the normally open contact ix1 of the first relay iX1 and the normally open contact tx1 of the first timer TX1 are turned on to turn the terminal first relay X05 on. Relay X01 is energized,
The check unit is required to perform a check operation for the i-th terminal path 3. [2] When the normally open contact x01 of the terminal first relay X01 is turned on, the terminal second relay X02 is energized, and when the normally open contact x02 of the terminal second relay X02 is turned on, the terminal third relay X03 is energized. At the same time, the second timing timer TX2 starts timing, and the normally open contact ix1 of the first relay iX1 and the normally open contact x03 of the terminal third relay X03 are turned on, so that the i-th second valve iVB is turned on. _R0- c is energized to close the i-th second valve iVB, and the normally open contact tx2 of the second timer TX2 is turned on to bring the terminal fourth relay X04 into the energized state. When x04 and the normally open contact ix1 of the first relay iX1 are turned on, current is applied between R _{0 and} c of the i-th first valve iVA to close the i-th first valve iVA, and the first timer TX1 normally open contact The on by setting time (about one second) timing of tx1, the following counters (i + 1) C is set. Then, assuming that water leakage has occurred in the j-th terminal path 3, before the second timer TT2 measures the set operating time T2, the j-th pressure switch jPA or jP.
One of the terminals B is turned on, and by turning it on, the terminal fifth relay X05 is energized, and the terminal fifth relay X05 is turned on.
When the normally open contact x05 is turned on, the terminal sixth relay X06
Is energized and the normally-open contact jx1 of the j-th first relay jX1 is already turned on. Therefore, when the normally-open contact x06 of the terminal sixth relay X06 is turned on, only the j-th second relay jX2 is turned on. Is energized, and the normally open contact jx2 of the second relay jX2 is turned on to maintain its self-energized state, and the terminal first relay X01 is deenergized, and the j-th first valve jVA and 2 valves j
VB is energized between R _{0 and} c and the j-th first valve jVA
Also, the closed state of the second valve jVB is maintained, and the j-th terminal alarm lamp j10B and the water leakage notification section j12B are activated.
Further, when a water leak signal is output from the overall check unit at the time of checking and at other times, that is, when the second relay X2 of the overall check unit is energized, the normally open contact x2 of the second relay X2 is turned on. When the relay X is turned on, the relay X is energized, and when the normally open contact x of the relay X is turned on,
The terminal third relay X03 and the terminal fourth relay X04 are in the non-energized state, and R ₀ − of all the first valves VA and the second valves VB
All of the first valve VA and the second valve VB are energized between c
Closes. The set detection time T1 and the set operation time T
2. The number n (natural number) of the terminal path 3 is determined so as to satisfy 1 ≦ n <T1 / T2.

[Embodiment 4] FIG.
As shown in FIG. 4, the water leakage detection device A for the whole shown in the second embodiment is provided. More specifically, the overall check unit is provided with the configuration of the sequence circuit shown in FIG. 25 and the one for performing the operation of the flowchart shown in FIG. 26. The configuration and operation are as follows. When any one of the reset external terminal ROT, the checker ON / OFF switch CS, and the reset switch RS is turned on, the reset relay X0 is energized, and when the normally-closed contact x0 of the reset relay X0 is turned off, the first timer TM1 is reset. At the same time, the second relay X2 is turned off, and the contact tm1 of the first timer TM1 is turned off.
1 is de-energized and the second timer TM2 is reset. Then, as in the case of the third embodiment, when the normally closed contact x1 of the first relay X1 is turned on, electricity is applied between Ro and the on-off valve V2 is opened, and the normally open contact x2 of the second relay X2 is opened.
When the switch is turned off, the whole alarm lamp 10 and the water leak notification unit 12 are reset. After the resetting in the above state, when the measured time t1 of the first timer TM1 reaches the set detection time T1, the contact tm1 of the first timer TM1 is turned on, and the contact tm1 is turned on so that the first relay X1 is in the energized state. At the same time, the second timer TM2 starts measuring time, and the normally open contact x1 of the first relay X1 is turned on to turn the opening / closing valve V2 to R.
When the pressure switch GP is turned on and the second relay X2 is energized, the second relay X2 is in a state of being energized. When no water leakage has occurred, the normally closed contact point tm is set in the above-described state, that is, the measured time t2 of the second timer TM2 becomes the set operation time T2.
2 is temporarily turned off, so that the first timer TM1
Is reset and, as before, its first timer TM
When the first contact tm1 is turned off, the first relay X1 is turned off and the second timer TM2 is reset. On the other hand, when water leakage occurs, the pressure switch GP is turned on before the time t2 of the second timer TM2 reaches the set time T2, and the second relay X2 is energized by turning on the pressure switch GP. When the normally open contact x2 of the second relay X2 is turned on, the second relay X2 keeps the energized state by itself and the whole alarm lamp 1
0, the leak notification unit 12 is activated. Although the on-off valve V2, the general warning lamp 10, and the water leakage notification unit 12 are not shown in the sequence circuit, the on-off valve V2 is provided similarly to the replenishment control valve V1 of the third embodiment, and the general warning lamp 10 and the water leakage notification unit are provided. 12 is the same as that of the third embodiment. In the above-described embodiment, the combination of the water leakage detection device A for the whole and the water leakage detection device B for the terminal is shown, but each may be provided independently. In the above embodiment, the pressure switches PA and PB are shown as the pressure detecting means 14, but a water level gauge may be used, and the pressures of the outward path 3A and the return path 3B are detected, but the valve 5 is not provided. When the outward path 3A and the return path 3B are always in communication, the pressure of only one of the outward path 3A and the return path 3B may be detected. Also,
Although the sequence control is performed in the above embodiment, the present invention is
It may be controlled using a microcomputer.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a block diagram of an overall leakage detection device according to a first embodiment.

FIG. 2 is an air conditioning circuit diagram in the first embodiment.

FIG. 3 is a sequence circuit diagram of the overall leakage detection device in the first embodiment.

FIG. 4 is a flowchart of the overall leakage detection device in the first embodiment.

FIG. 5 is a block diagram of a water leakage detection device for a terminal according to the first embodiment.

FIG. 6 is a sequence circuit diagram of a main part of the water leakage detection device for a terminal in the first embodiment.

FIG. 7 is a sequence circuit diagram of a main part of the water leakage detection device for a terminal in the first embodiment.

FIG. 8 is a flowchart of a water leak detection device for a terminal according to the first embodiment.

FIG. 9 is a block diagram of an overall leakage detection device according to a second embodiment.

FIG. 10 is an air conditioning circuit diagram in the second embodiment.

FIG. 11 is a sequence circuit diagram of the overall leakage detection device according to the second embodiment.

FIG. 12 is a flowchart of an overall water leak detection device according to a second embodiment.

FIG. 13 is an air conditioning circuit diagram in the third embodiment.

FIG. 14 is a sequence circuit diagram of the main part of the integrated checker in the third embodiment.

FIG. 15 is a sequence circuit diagram of the main part of the integrated checker in the third embodiment.

FIG. 16 is a sequence circuit diagram of the main part of the integrated checker in the third embodiment.

FIG. 17 is a sequence circuit diagram of the main part of the integrated checker in the third embodiment.

FIG. 18 is a sequence circuit diagram of the main part of the integrated checker in the third embodiment.

FIG. 19 is a sequence circuit diagram of the main part of the integrated checker in the third embodiment.

FIG. 20 is a flowchart of the overall check unit according to the third embodiment.

FIG. 21 is a flowchart of the terminal check unit according to the third embodiment.

FIG. 22 is a flowchart of the terminal check unit in the third embodiment.

FIG. 23 is a flowchart of the terminal check unit in the third embodiment.

FIG. 24 is an air conditioning circuit diagram in the fourth embodiment.

FIG. 25 is a sequence circuit diagram of the main part of the integrated checker in the fourth embodiment.

FIG. 26 is a flowchart of the overall checking unit according to the fourth embodiment.

[Explanation of symbols]

 1 circulation path 4 air conditioner 3A outward path 3B return path 3 terminal path 2 expansion tank 6 leak detection means FS flow sensor 7 determination means GP gas pressure sensor 17 determination means VA opening / closing valve VB opening / closing valve 14 pressure detection means 15 valve control means 16 leakage Liquid determination means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshio Sakai 4-1-1 Honmachi, Chuo-ku, Osaka City, Osaka Prefecture Takenaka Corporation, Osaka Main Store (72) Inventor Kazuo Asada, Honmachi, Chuo-ku, Osaka City, Osaka Prefecture 1-13 No. 13 Takenaka Corporation Osaka Main Store (72) Inventor Isao Hayashi 3-1, Mibugayo Goshocho, Nakagyo-ku, Kyoto-shi, Kyoto Asahi Kikai Co., Ltd. (72) Inventor Takeshi Inoue Toyota, Aichi Prefecture 3-15 Akebono-cho, Ichi, Japan Asahi Equipment Co., Ltd. Toyota Branch

Claims (5)

[Claims] 1. A circulation path (1) for a heat medium liquid is provided, and a forward path (3A) for sending the heat medium liquid from the circulation path (1) to the air conditioner (4) and the air conditioner (4) from the forward path (3A). A terminal path (3) having a return path (3B) for returning the heat transfer medium to the circulation path (1) is connected to the circulation path (1), and an expansion tank (2) is connected to the circulation path (1). In the air-conditioning equipment, the liquid leakage detection means (6) which outputs a liquid leakage signal when detecting the presence or absence of an outflow abnormality of the heat medium liquid from the expansion tank (2) to the circulation path (1). A leak detection device for air conditioning equipment. 2. The liquid leakage detection means (6) comprises:
An open type expansion tank (2) is provided as the expansion tank (2), and a flow sensor (FS) for detecting the presence or absence of outflow of the heat transfer liquid from the expansion tank (2) to the circulation path (1) at a flow rate higher than a set flow rate.
2. The leak detecting device for air conditioning equipment according to claim 1, further comprising a determining means (7) for outputting a leak signal when the presence state of the flow sensor (FS) is continued for a set time. 3. The liquid leakage detection means (6) comprises:
A closed type is provided as the expansion tank (2), a gas pressure sensor (GP) for detecting the gas pressure in the expansion tank (2) is provided, and the detected gas pressure of the gas pressure sensor (GP) is set for a set time. A judging means (17) for outputting a liquid leakage signal when the gas pressure drops below a set gas pressure is provided inside.
The leak detection device for the air conditioning equipment described. 4. A heat transfer medium circulation path (1) is provided, and a forward path (3A) for sending the heat transfer fluid from the circulation path (1) to the air conditioner (4) and the air conditioner (4) from the forward path (3A). A terminal path (3) having a return path (3B) for returning the heat transfer medium to the circulation path (1) is connected to the circulation path (1), and an expansion tank (2) is connected to the circulation path (1). In the air conditioning equipment, the opening / closing valve (VA) is provided near each of the forward path (3A) and the return path (3B) of the terminal path (3) near the connection to the circulation path (1).
(VB) is provided, pressure detection means (14) for detecting the pressure in the terminal passage (3) is provided, and the on-off valves (VA) (V
Valve control means (15) for keeping B) closed for each set detection time for a set operating time shorter than the set detection time.
And a liquid leakage determination unit (1) that outputs a liquid leakage signal when the pressure detected by the pressure detection unit falls below a set pressure in a state where the opening / closing valves (VA) (VB) are closed.
6) A leak detection device for air conditioning equipment provided with. 5. A leak detecting device for an air conditioner, comprising the leak detecting device for an air conditioner according to claim 1, 2, or 3 and the leak detecting device for an air conditioner according to claim 4.