JP2012202674A - Absorption type freezer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorption type freezer capable of inexpensively detecting refrigerant leakage in an absorber at an early stage.SOLUTION: An absorption type freezer 100 includes a high temperature regenerator 5, a low temperature regenerator 6, an evaporator 1, a condenser 7, and an absorber 2, and these units are connected with pipes, thereby forming a circulation path both for absorption liquid and refrigerants. In the absorber 2, a cooling water pipe 15 is arranged for circulating cooling water whose density is smaller than that of the absorption liquid, and a leakage detector 60 is also disposed there for detecting the leakage of the cooling water based on the density variation of the absorption liquid in the absorber 2.

Description

  The present invention relates to an absorption refrigerator having a pipe for circulating a cooling refrigerant for cooling an absorbent in an absorber.

  2. Description of the Related Art Conventionally, absorption refrigerators that include a high-temperature regenerator, a low-temperature regenerator, a condenser, an evaporator, and an absorber, which are connected to each other by piping to form a circulation path for absorbing liquid and refrigerant, are known (for example, , See Patent Document 1). In this type of absorption chiller, the refrigerant vapor evaporated by the evaporator is absorbed by the absorption liquid, and the inside of the absorber is maintained in a high vacuum state, and the absorption liquid absorbs the refrigerant vapor in the absorber. A pipe through which a cooling refrigerant for cooling the heat generated in the refrigerant flows is provided.

JP 2000-283668 A

By the way, since the inside of the absorber is maintained in a high vacuum state, when the cooling refrigerant leaks in the absorber, the cooling refrigerant flows into the absorber due to a pressure difference, so that the concentration of the absorbing liquid is reduced. There is a problem that it becomes thinner than the specified value and the cooling capacity decreases.
However, in the conventional configuration, even when refrigerant leakage occurs in the absorber, the fact of this refrigerant leakage is the pressure of the high-temperature regenerator due to the fact that the interior of the absorption chiller becomes full during operation. A high-abnormality report or a maintenance call due to a decrease in cooling capacity did not detect the sight glass provided in the circulation path until an operator visually observed it, making it difficult to detect the refrigerant leak early. In this case, it is conceivable to attach a pressure sensor to the absorber. However, since the inside of the absorber is kept in a high vacuum state and high accuracy is required for the sensor to be used, the configuration with the pressure sensor is expensive. There was a problem.
This invention is made | formed in view of the situation mentioned above, and it aims at providing the absorption refrigerator which can detect a refrigerant | coolant leak in an absorber early and cheaply.

  In order to achieve the above object, the present invention comprises a high temperature regenerator, a low temperature regenerator, a condenser, an evaporator, and an absorber, and these are connected to form a circulation path for the absorbing liquid and the refrigerant, respectively. In the absorption refrigerator having a pipe for circulating a cooling refrigerant having a density lower than that of the absorbing liquid in the absorber, the cooling refrigerant leaks based on a change in density of the absorbing liquid in the absorber. A refrigerant leak detecting means for detecting is provided.

  In this case, the refrigerant leak detection means includes an arm portion that is swingably arranged around a support shaft, a float provided at one end of the arm portion, and the density of the absorbing liquid is smaller than the density of the float. In such a case, a switch portion that operates by contacting or approaching the arm portion may be provided. Furthermore, the density of the float may be set smaller than the minimum density of the absorbing liquid during normal operation.

  The switch unit may be disposed so as to protrude inward from the outside of the absorber, and a cover body that covers the switch unit may be provided in the absorber. The refrigerant leak detection means may be disposed in an absorption liquid reservoir of the absorber. Moreover, when the said refrigerant | coolant leak detection means detects the leak of the said refrigerant | coolant for cooling, you may provide the alerting | reporting means which alert | reports the leak of the said refrigerant | coolant.

  According to the present invention, when the cooling refrigerant leaks in the absorber, the refrigerant leak detection means detects a decrease in the density of the absorbing liquid due to the mixing of the cooling refrigerant into the absorbing liquid. Without providing a pressure sensor, it is possible to detect the leakage of the cooling refrigerant at a low cost and at an early stage.

It is a schematic block diagram of the absorption refrigerator concerning this embodiment. It is a figure which shows the state before a leak detection apparatus act | operates. It is a figure which shows the state which the leak detection apparatus act | operated.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of an absorption refrigerator 100 according to the present embodiment. The absorption refrigerator 100 is a double-effect absorption refrigerator that uses water as a refrigerant and a lithium bromide (LiBr) aqueous solution as an absorption liquid.
As shown in FIG. 1, the absorption refrigerator 100 includes an evaporator 1, an absorber 2 provided side by side with the evaporator 1, and an evaporator absorber body (which stores the evaporator 1 and the absorber 2). (Lower body) 3, a high-temperature regenerator 5 having a gas burner 4, a low-temperature regenerator 6, a condenser 7 juxtaposed to the low-temperature regenerator 6, and the low-temperature regenerator 6 and the condenser 7 were accommodated. Low temperature regenerator condenser cylinder (upper cylinder) 8, low temperature heat exchanger 12, high temperature heat exchanger 13, refrigerant drain heat exchanger 16, rare absorbent pump P1, concentrated absorbent pump P2, refrigerant A pump P3 is provided, and these devices are connected to each other through absorption liquid pipes 21 to 25, refrigerant pipes 31 to 36, and the like.
Reference numeral 14 denotes a cold / hot water pipe for circulatingly supplying a heat medium or brine (hereinafter referred to as brine or the like) heat-exchanged with the refrigerant in the evaporator 1 to a heat load (not shown) such as an air conditioner. A heat transfer tube 14 </ b> A formed in a part of the cold / hot water tube 14 is disposed in the evaporator 1. Reference numeral 15 denotes a cooling water pipe (pipe) for sequentially flowing cooling water (cooling refrigerant) through the absorber 2 and the condenser 7, and each heat transfer pipe 15 </ b> A, 15 </ b> B formed in a part of the cooling water pipe 15. Are arranged in the absorber 2 and the condenser 7, respectively. In the present embodiment, water having a density lower than that of the absorbing liquid is used for the cooling water.
Reference numeral 50 denotes a control device that controls the entire absorption refrigerator 100, and a buzzer (notification unit) 54 that reports an abnormality when various abnormalities occur is connected to the control device 50. Instead of the buzzer 54 or in addition to the buzzer 54, a lamp may be turned on or displayed on a screen provided on the operation panel to notify the abnormality.

  The absorber 2 has a function of absorbing the refrigerant vapor evaporated in the evaporator 1 into the absorption liquid and maintaining the pressure in the evaporator absorber body 3 in a high vacuum state. In the lower part of the absorber 2, there is formed a dilute absorption liquid reservoir (absorption liquid reservoir) 2A in which a dilute absorption liquid that has been diluted by absorbing refrigerant vapor is accumulated. The dilute absorption liquid reservoir 2A includes an absorption refrigerator. When circulating through each of the 100 devices, the absorption liquid having the lowest concentration is stored. One end of a rare absorbing liquid pipe 21 provided with a rare absorbing liquid pump P1 that is controlled by an inverter 51 so as to be variable in frequency is connected to the rare absorbing liquid reservoir 2A. The rare absorbent pipe 21 is branched into a first rare absorbent pipe 21A and a second rare absorbent pipe 21B on the downstream side of the rare absorbent pump P1, and the first rare absorbent pipe 21A is a refrigerant drain heat exchanger. 16, the second rare absorbent pipe 21 </ b> B joins again after passing through the low-temperature heat exchanger 12. The other end of the rare absorption liquid pipe 21 passes through the high-temperature heat exchanger 13 and then opens to the gas layer part 5B located above the heat exchange part 5A formed in the high-temperature regenerator 5.

The high-temperature regenerator 5 heats and regenerates the absorption liquid accumulated in the heat exchange unit 5A using the flame of the gas burner 4 as a heat source, and the heat exchange unit 5A is heated and regenerated on the side of the heat exchange unit 5A. An intermediate absorption liquid reservoir 5C is formed in which the intermediate absorption liquid is stored. The intermediate absorbing liquid reservoir 5C is provided with a liquid level sensor (liquid level detector) 52 for detecting the liquid level of the absorbing liquid accumulated in the intermediate absorbing liquid reservoir 5C (in the high temperature regenerator 5). The liquid level sensor 52 includes three electrodes A, B, and C having different lengths, and the electrode B having the longest length is a common electrode, and the liquid level of the absorbing liquid rises to increase the liquid level. When the electrode A to be detected is reached, the electrode A and the electrode B become conductive, and the control device 50 detects the liquid level high level.
Further, when the liquid level of the absorbing liquid is lower than the electrode C for detecting the liquid level low level and the electrodes B and C are in a non-conductive state, the control device 50 detects the liquid level low. For this reason, the liquid level of the absorbing liquid is not lower than the electrode C and the range not higher than the electrode A is the normal state of the absorbing liquid amount, and the controller 50 monitors whether or not this state is in effect.

One end of the intermediate absorption liquid pipe 22 is connected to the lower end of the intermediate absorption liquid reservoir 5C, and the other end of the intermediate absorption liquid pipe 22 is formed in the upper part of the low temperature regenerator 6 via the high temperature heat exchanger 13. The gas layer 6A is opened. The high temperature heat exchanger 13 heats the absorption liquid flowing through the rare absorption liquid pipe 21 with the high temperature of the high temperature absorption liquid flowing out from the intermediate absorption liquid reservoir 5C, and the fuel consumption of the gas burner 4 in the high temperature regenerator 5 is increased. We are trying to reduce it.
In the present embodiment, the intermediate absorption liquid pipe 22 includes a solution adjustment valve 53 that adjusts the flow rate of the absorption liquid flowing through the intermediate absorption liquid pipe 22 between the high temperature heat exchanger 13 and the low temperature regenerator 6. The solution adjustment valve 53 is adjusted in opening degree according to the liquid level detected by the liquid level sensor 52 under the control of the control device 50, and the liquid level of the absorbing liquid is in a normal state. In this case, the opening degree is held in a half-open state. Further, the upstream side of the high-temperature heat exchanger 13 of the intermediate absorption liquid pipe 22 and the absorber 2 are connected by an absorption liquid pipe 23 with an on-off valve V1 interposed therebetween.

The low-temperature regenerator 6 uses the refrigerant vapor separated by the high-temperature regenerator 5 as a heat source to heat and regenerate the absorption liquid stored in the absorption liquid reservoir 6B formed below the gas layer portion 6A. In 6B, a heat transfer tube 31A formed in a part of the refrigerant tube 31 extending from the upper end of the high temperature regenerator 5 to the bottom of the condenser 7 is disposed. By circulating the refrigerant vapor through the refrigerant pipe 31, the heat of the refrigerant vapor is transmitted to the absorption liquid stored in the absorption liquid reservoir 6B via the heat transfer pipe 31A, and the absorption liquid is further concentrated.
One end of a concentrated absorption liquid pipe 24 is connected to the lower end of the absorption liquid reservoir 6B of the low temperature regenerator 6, and the other end of the concentrated absorption liquid pipe 24 is connected via the concentrated absorption liquid pump P2 and the low temperature heat exchanger 12. The absorber 2 is connected to a concentrated liquid spreader 2C provided on the upper part of the gas layer 2B. The low-temperature heat exchanger 12 heats the rare absorbent flowing through the second rare absorbent pipe 21B with the warm heat of the concentrated absorbent flowing out from the absorbent pool 6B of the low-temperature regenerator 6. Further, a bypass pipe 25 that bypasses the concentrated absorbent pump P2 and the low-temperature heat exchanger 12 is provided upstream of the concentrated absorbent pump P2, and the operation of the concentrated absorbent pump P2 is stopped. In this case, the absorption liquid flowing out from the absorption liquid reservoir 6B of the low-temperature regenerator 6 is supplied into the absorber 2 through the bypass pipe 25 without passing through the low-temperature heat exchanger 12.

  As described above, the gas layer 5B of the high-temperature regenerator 5 and the bottom of the condenser 7 are the refrigerant that passes through the heat transfer pipe 31A and the refrigerant drain heat exchanger 16 that are piped to the absorption liquid reservoir 6B of the low-temperature regenerator 6. The refrigerant pipe 31 is connected to the upstream side of the heat transfer pipe 31A and the gas layer 2B of the absorber 2 by a refrigerant pipe 32 having an on-off valve V2. Further, the bottom of the condenser 7 and the gas layer part 1A of the evaporator 1 are connected by a refrigerant pipe 33 with a U seal part 33A interposed therebetween. A refrigerant liquid reservoir 1B in which liquefied refrigerant accumulates is formed below the evaporator 1, and the refrigerant liquid reservoir 1B and the spreader 1C disposed above the gas layer portion 1A of the evaporator 1 are refrigerant pumps P3. Are connected by a refrigerant pipe 34. The refrigerant pipe 34 downstream side of the refrigerant pump P3 and the absorbing liquid reservoir 2A of the absorber 2 are connected by a refrigerant pipe 35 having an on-off valve V3 interposed therebetween. Further, the outlet side of the heat transfer pipe 14A of the cold / hot water pipe 14 and the outlet side of the heat transfer pipe 15B of the cooling water pipe 15 are connected by a refrigerant pipe 36 having an on-off valve V4 interposed therebetween.

Under the control of the control device 50, the absorption refrigerator 100 is switched between a cooling operation in which cold water is extracted from the cold / hot water pipe 14 and a heating operation in which hot water is extracted from the cold / hot water pipe 14.
During the cooling operation, the absorption refrigeration is performed so that the temperature on the outlet side of the evaporator 1 such as brine (for example, cold water) circulated and supplied to a heat load (not shown) through the cold / hot water pipe 14 becomes a predetermined set temperature, for example, 7 ° C The amount of heat input to the machine 100 is controlled by the control device 50. Specifically, the control device 50 closes all the on-off valves V1 to V4, starts all the pumps P1 to P3, burns the gas in the gas burner 4, and measures the temperature of the brine or the like measured by the temperature sensor S1. The heating power of the gas burner 4 is controlled so that becomes a predetermined 7 ° C.

  The rare absorbent transported from the absorber 2 to the high temperature regenerator 5 by the rare absorbent pump P1 through the rare absorbent pipe 21 is heated by the flame by the gas burner 4 and the high temperature combustion gas in the high temperature regenerator 5. Therefore, the refrigerant in the rare absorbent is evaporated and separated. The intermediate absorbing liquid whose concentration has been increased by evaporating and separating the refrigerant in the high temperature regenerator 5 is sent to the low temperature regenerator 6 via the high temperature heat exchanger 13. In this low-temperature regenerator 6, the intermediate absorbent is heated by the high-temperature refrigerant vapor supplied from the high-temperature regenerator 5 through the refrigerant pipe 31 and flowing into the heat transfer pipe 31A, and the refrigerant is further separated to further increase the concentration. Thus, the concentrated absorbent is sent to the absorber 2 via the concentrated absorbent pump P2 and the low-temperature heat exchanger 12, and sprayed from above the concentrated liquid sprayer 2C.

On the other hand, the refrigerant separated and generated by the low temperature regenerator 6 enters the condenser 7 and condenses. Then, the refrigerant liquid generated in the condenser 7 enters the evaporator 1 through the refrigerant pipe 33, is pumped by the operation of the refrigerant pump P3, and passes from the spreader 1C to the heat transfer pipe 14A of the cold / hot water pipe 14. Sprayed on.
The refrigerant liquid sprayed on the heat transfer tube 14A evaporates by removing vaporization heat from the brine passing through the inside of the heat transfer tube 14A, so that the brine etc. passing through the inside of the heat transfer tube 14A is cooled, thus lowering the temperature. Brine or the like is supplied from the cold / hot water pipe 14 to the heat load, and cooling operation such as cooling is performed.
Then, the refrigerant evaporated in the evaporator 1 enters the absorber 2, is absorbed by the concentrated absorbent supplied from the low temperature regenerator 6 and sprayed from above, and accumulates in the rare absorbent reservoir 2A of the absorber 2, The circulation conveyed to the high temperature regenerator 5 by the absorption liquid pump P1 is repeated. Note that the heat generated when the absorbing liquid absorbs the refrigerant is cooled by the heat transfer pipe 15 </ b> A of the cooling water pipe 15 disposed in the absorber 2.

During the heating operation, the absorption chiller 100 is set such that the outlet side temperature of the evaporator 1 such as brine (for example, hot water) circulated and supplied to the heat load via the cold / hot water pipe 14 becomes a predetermined set temperature, for example, 55 ° C. The amount of heat input to the is controlled by the control device 50. Specifically, the control device 50 opens the on-off valves V1 to V3, starts all the pumps P1, burns gas in the gas burner 4, and the temperature of the brine or the like measured by the temperature sensor S1 is a predetermined 55. The heating power of the gas burner 4 is controlled so as to be at ° C. Further, the circulation of the cooling water to the cooling water pipe 15 is stopped.
In this case, the refrigerant evaporated from the rare absorbent in the high-temperature regenerator 5 enters the absorber 2 and the evaporator 1 mainly from the middle of the refrigerant pipe 31 through the refrigerant pipe 32 having a small channel resistance, and enters the cold / hot water pipe. The water supplied from 14 is condensed by exchanging heat via the heat transfer tube 14A, and the water flowing through the heat transfer tube 17A is heated by the condensation heat at this time. The brine whose temperature has been raised in this way is supplied from the cold / hot water pipe 14 to the heat load, and the heating operation is performed.

  The refrigerant condensed by the heating action in the evaporator 1 enters the absorber 2 through the weir partitioning the refrigerant liquid reservoir 1B absorbing liquid reservoir 2A at the bottom of the evaporator 1, and in the absorber 2, the absorbing liquid pipe 23 And the absorption liquid flowing in from the high temperature regenerator 5 through the on-off valve V1, and by operating the rare absorption liquid pump P1, the refrigerant drain heat exchanger 16, the low temperature heat exchanger 12, and the high temperature heat are discharged from the rare absorption liquid pipe 21. It is sent to the high-temperature regenerator 5 via the exchanger 13.

By the way, since the inside of the evaporator absorber cylinder 3 provided with the absorber 2 is maintained in a high vacuum state as described above, cooling water leaks from the cooling water pipe 15 in the evaporator absorber cylinder 3 or cold / hot water. When brine or the like leaks from the pipe 14, the cooling water, brine, or the like flows into the rare absorbent reservoir 2A due to a pressure difference, so that the concentration of the absorbent becomes thinner than the specified value and the cooling capacity decreases. There is.
In this configuration, as shown in FIG. 1, the rare absorbent reservoir 2A includes a leak detection device (refrigerant) that detects leakage of cooling water or brine based on the density change of the absorbent in the rare absorbent reservoir 2A. Leakage detection means) 60 is arranged.
As shown in FIG. 2, the leak detection device 60 is a balance rod (arm portion) 63 that is swingably disposed around a support shaft 62 on a support 61 that is erected on the bottom surface 2A1 of the rare absorbent reservoir 2A. When the first float 64 and the second float 65 are provided at both ends of the balance rod 63 and the first float 64 side of the balance rod 63 is lowered, the balance 63 and the balance And a switch (switch unit) 66 that operates in contact therewith. The switch 66 is connected to the control device 50 and outputs an output signal to the control device 50 when the switch 66 is activated.

The first float 64 and the second float 65 are formed of two kinds of materials having different densities. In this embodiment, the first float 64 has a density smaller than the minimum density of the absorbing liquid during normal operation. The second float 65 is made of stainless steel, which is a material having a density sufficiently higher than the density of the first float 64 and the absorbing liquid. Yes. The volume V1 of the first float 64 is formed larger than the volume V2 of the second float 65. For this reason, when the leak detection device 60 is disposed in the rare absorbent reservoir 2A, the first float 64 is moved to the second float 65 as shown in FIG. 2 due to the difference in buoyancy between the first float 64 and the second float 65 during normal operation. The balance rod 63 is held in a tilted state so as to be positioned above.
On the other hand, as shown in FIG. 3, when the concentration (density) of the absorbing solution falls below a predetermined threshold smaller than the density of the first float 64, the balance 63 has the first float 64 that is more than the second float 65. The balance is designed to be positioned below. This threshold is set to, for example, 1/2 of the minimum density of the absorbing liquid during normal operation, and the inclination of the balance 63 is changed when the concentration (density) of the absorbing liquid becomes approximately doubled.

The switch 66 is a push button switch including an abutting portion 67 that is displaced in the axial direction when the object to be detected abuts. When the abutting portion 67 is pushed in the axial direction, an internal contact is closed and an output signal is output. To emit.
In the present embodiment, the switch 66 is disposed so as to protrude from the outside of the rare absorbent reservoir 2A through the opening 70 formed in the rare absorbent reservoir 2A, and in the rare absorbent reservoir 2A, A cover body 71 that covers the switch 66 is disposed. The cover body 71 includes an upper surface portion 73 that extends between the balance rod 63 and the contact portion 67 of the switch 66, and a side surface portion 72 that connects the upper surface portion 73 and the opening 70 in a watertight manner. The side surface 72 is formed in a bellows shape that is shortened when the balance 63 comes into contact, for example, using a flexible material such as polytetrafluoroethylene.
According to this configuration, since the switch 66 can be disposed outside the evaporator absorber body 3, it is possible to easily detect a change in the tilt of the balance 63 without securing the waterproofness and insulation of the switch 66. be able to.

Next, the operation of the leak detection device 60 will be described.
During normal operation, the density of the rare absorbent in the rare absorbent pool 2A is larger than the density of the first float 64. Therefore, due to the difference in buoyancy between the first float 64 and the second float 65, as shown in FIG. The balance rod 63 is held in an inclined state so that the first float 64 is positioned above the second float 65.
In this state, when cooling water leaks from the cooling water pipe 15 in the evaporator absorber body 3 or brine leaks from the cold / hot water pipe 14, the cooling water, brine, etc. are stored in the rare absorbing liquid reservoir 2A. Therefore, the concentration and density of the rare absorbent are reduced.
When the concentration (density) of the rare absorbent is below the predetermined threshold, the balance rod 63 is tilted so that the first float 64 is positioned below the second float 65, as shown in FIG. When the balance 63 pushes the contact portion 67 of the switch 66, the switch 66 is activated to detect leakage of cooling water or brine in the evaporator absorber body 3.

  As described above, according to the present embodiment, the high-temperature regenerator 5, the low-temperature regenerator 6, the evaporator 1, the condenser 7, and the absorber 2 are provided, and these are connected by piping to circulate the absorbing liquid and the refrigerant. In the absorption refrigerator 100 including the cooling water pipe 15 that forms the respective paths and distributes the cooling water having a density lower than that of the absorbing liquid in the absorber 2, cooling is performed based on the density change of the absorbing liquid in the absorber 2. Since the leak detection device 60 that detects the leak of water is provided, the leak detection device 60 detects a decrease in the density of the absorption liquid due to mixing of the cooling water into the absorption liquid, so that an expensive pressure sensor or the like is not provided. Therefore, it is possible to detect the leakage of the cooling water in the absorber 2 at low cost and early.

  In addition, according to the present embodiment, the leak detection device 60 includes the balance rod 63 that is swingably arranged around the support shaft 62, the first float 64 provided at one end of the balance rod 63, and the absorbent liquid. When the density of the first float 64 is smaller than the density of the first float 64, the switch 66 that operates by contacting the balance 63 is provided. Can be detected.

  Further, according to the present embodiment, the density of the first float 64 is set to be smaller than the minimum density of the rare absorbent in the rare absorbent pool 2A during normal operation. And the detection accuracy of the leak detection device 60 can be increased.

  Further, according to the present embodiment, the switch 66 is disposed so as to protrude from the outside of the absorber 2 to the inside, and the cover body 71 that covers the switch 66 is provided in the absorber 2. Even if the waterproof and insulating properties of the switch 66 are not secured, a change in the inclination of the balance rod 63 can be easily detected.

  Further, according to the present embodiment, since the leak detection device 60 is disposed in the rare absorbing liquid reservoir 2A of the absorber 2, even if cooling water leaks in the absorber 2, this cooling water Leaks can be detected early. Furthermore, since the rare absorption liquid is always stored in the rare absorption liquid reservoir 2A, the leak detection device 60 can be held in a submerged state, and malfunction of the leak detection device 60 can be suppressed.

  Moreover, according to this embodiment, when the leak detection device detects the leakage of the cooling water, the buzzer 54 that notifies the leakage of the cooling water is provided, so that the leakage of the cooling water can be reliably transmitted to the worker. It is possible to cope with the leakage of the cooling water as soon as possible.

  The above-described embodiment shows one aspect to which the present invention is applied, and the present invention is not limited to the above-described embodiment. For example, in the present embodiment, the configuration using a push button switch as the switch 66 has been described. However, the present invention is not limited to this, and by detecting a magnetic loss due to an eddy current generated on the conductor surface due to the influence of an external magnetic field, A non-contact type proximity switch that can detect the proximity of the balance 63 made of a conductor may be used. According to this structure, since it does not contact | abut with the balance lever 63, it is not necessary to make the cover body 71 the structure provided with flexibility, and also a structure can be simplified.

In this embodiment, since the waterproof and insulating properties are taken into consideration, the switch 66 is disposed in the outer space of the evaporator absorber body 3. However, if the switch can secure a sufficient waterproof and insulating property, it is rarely absorbed. Of course, it may be arranged in the liquid reservoir 2A.
Further, in the present embodiment, the leak detection device 60 is configured to include the balance rod 63 having floats at both ends of the support shaft 62, but the float is provided at one end and the other end is swingably disposed on the support column. Also good.
In this embodiment, the absorption refrigerator 100 is a double effect type, but the present invention is applied to a single effect type, a single double effect type and a triple effect type absorption refrigerator and an absorption heat pump device. Of course, it is applicable.

1 Evaporator 2 Absorber 2A Rare Absorbing Liquid Pool (absorbing liquid pool)
2A1 Bottom 3 Evaporator Absorber Body 5 High Temperature Regenerator 6 Low Temperature Regenerator 7 Condenser 14 Cold / Hot Water Pipe 15 Cooling Water Pipe (Piping)
50 control device 54 buzzer (notification means)
60 Leak detection device (refrigerant leak detection means)
61 support 62 support shaft 63 balance rod (arm)
64 First float (float)
65 Second float 66 Switch (switch part)
67 Contact portion 70 Opening 71 Cover body 72 Side surface portion 73 Upper surface portion 100 Absorption type refrigerator

Claims (6)

A high-temperature regenerator, a low-temperature regenerator, a condenser, an evaporator, and an absorber are provided, and these are connected by piping to form a circulation path for the absorption liquid and the refrigerant, respectively, and the density in the absorber is higher than that of the absorption liquid. In an absorption refrigerator having a pipe for circulating a small cooling refrigerant,
An absorption refrigerating machine comprising: a refrigerant leak detecting means for detecting a leak of the cooling refrigerant based on a density change of the absorbing liquid in the absorber.   The refrigerant leak detection means includes an arm portion that is swingably arranged around a support shaft, a float provided at one end of the arm portion, and a density of the absorbing liquid that is smaller than a density of the float. The absorption refrigerator according to claim 1, further comprising a switch portion that operates by contacting or approaching the arm portion.   The absorption type refrigerator according to claim 2, wherein the density of the float is set to be smaller than the minimum density of the absorbing liquid during normal operation.   The said switch part is arrange | positioned so that it may protrude inside from the outer side of the said absorber, The cover body which covers the said switch part was provided in the said absorber, The Claim 2 or 3 characterized by the above-mentioned. Absorption refrigerator.   The absorption refrigerator according to any one of claims 1 to 4, wherein the refrigerant leak detection means is disposed in an absorption liquid reservoir of the absorber.   The absorption refrigerator according to any one of claims 1 to 5, further comprising an informing unit for informing the refrigerant leakage when the refrigerant leakage detecting unit detects the leakage of the cooling refrigerant.

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