JP2013231551A - Absorption refrigerating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorption refrigerating machine capable of detecting the pressure of an exhaust gas while preventing the corrosion of a sensing part of a pressure detection means.SOLUTION: An absorption refrigerating machine including a high temperature regenerator 5, a low temperature regenerator, a condenser, an evaporator, and an absorber which are connected by piping and form circulation paths for each of an absorption liquid and a refrigerant includes an exhaust route 17 that exhausts exhaust gas externally from a combustion chamber 5A of the high temperature regenerator 5, a branch pipe 72 that diverges the exhaust gas from the exhaust route 17, and a pressure detection means 71 that is provided at the branch pipe 72 and detects the pressure of the exhaust gas, in which the branch pipe 72 is provided with a damming part 73 that breaks when the pressure of the exhaust gas becomes higher than predetermined pressure.

Description

  The present invention relates to an absorption chiller in which pressure detection means is provided in an exhaust gas exhaust path.

  2. Description of the Related Art Conventionally, absorption refrigerating machines 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 absorption liquid and refrigerant, are known (for example, , See Patent Document 1). In this type of absorption refrigerator, the high temperature regenerator is provided with an exhaust path for exhausting the exhaust gas from the combustion chamber of the high temperature regenerator to the outside.

JP2011-208845A

By the way, in the absorption chiller, in order to stop the absorption chiller when the pressure of the exhaust path rises due to the blockage of the chimney or the flue part on the equipment side connected to the chimney, etc. It is desired to provide a pressure detection means for detecting the pressure of the exhaust gas.
However, when the pressure detection means is provided in the exhaust path, the pressure detection means is always in contact with the exhaust gas, so that the pressure sensing part of the pressure detection means may be corroded by the components contained in the exhaust gas.
The present invention has been made in view of the above-described circumstances, and an object thereof is to provide an absorption refrigerator that can detect the pressure of exhaust gas while preventing corrosion of the pressure sensing part of the pressure detecting means. .

  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, which are connected to each other to form a circulation path for absorbing liquid and refrigerant. In the refrigerator, the exhaust path for exhausting the exhaust gas from the combustion chamber of the high-temperature regenerator to the outside, the branch pipe for branching the exhaust gas from the exhaust path, and the branch pipe, Pressure detecting means for detecting pressure, and the branch pipe is provided with a damming portion that breaks when the pressure of the exhaust gas exceeds a predetermined pressure.

  In the above configuration, the damming portion may be a liquid reservoir that stores a liquid.

  In the above configuration, the branch pipe may have such a length that the liquid does not reach the pressure detection means when the pressure of the exhaust gas becomes equal to or higher than the predetermined pressure.

  The said structure WHEREIN: The said branch pipe may have a connection port detachably attached to the said exhaust route.

  According to the present invention, there is provided a branch pipe that branches the exhaust gas from the exhaust path, and a pressure detection means that is provided in the branch pipe and detects the pressure of the exhaust gas, and the pressure of the exhaust gas is predetermined in the branch pipe. Since the damming portion that breaks when the pressure exceeds the pressure is provided, the time for the pressure detecting means to contact the exhaust gas can be shortened, so that the pressure sensing portion of the pressure detecting means can be prevented from corroding and the pressure of the exhaust gas can be reduced. Can be detected.

It is a schematic block diagram of the absorption refrigerator which concerns on embodiment of this invention. It is a schematic diagram which shows a pressure detection means. It is a perspective view which shows a pressure detection unit. It is a figure which shows a part of branch pipe, (A) is a top view, (B) is a front view, (C) is a side view. It is a graph which shows the relationship between a chimney obstruction | occlusion rate and exhaust gas pressure. It is explanatory drawing which shows the damming state of a branch pipe typically, (A) is a damming state, (B) is the time of a pressure rise, (C) is a figure which shows a damming state. It is a figure which shows the pressure detection unit which concerns on other embodiment of this invention, (A) is a top view, (B) is a front view, (C) is a side view.

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

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic configuration diagram of an absorption refrigerator 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 in parallel with the evaporator 1, and an evaporator absorber body 3 that houses the evaporator 1 and the absorber 2. A high temperature regenerator 5 having a gas burner 4, a low temperature regenerator 6, a condenser 7 arranged in parallel with the low temperature regenerator 6, and a low temperature regenerator condensing the low temperature regenerator 6 and the condenser 7. The body 8, the low-temperature heat exchanger 12, the high-temperature heat exchanger 13, the refrigerant drain heat exchanger 16, the rare absorbent liquid pump P 1, the concentrated absorbent liquid pump P 2, and the refrigerant pump P 3 are provided. Each device is connected by piping through absorption liquid pipes 21 to 25, refrigerant pipes 31 to 35, and the like.
Reference numeral 14 denotes a cold / hot water pipe for circulatingly supplying brine heat exchanged with the refrigerant in the evaporator 1 to a heat load (not shown) (for example, an air conditioner). A heat transfer tube 14 </ b> A formed in the section is arranged in the evaporator 1. A temperature sensor 61 for measuring the temperature of the brine flowing through the cold / hot water pipe 14 is provided on the downstream side of the heat transfer pipe 14 </ b> A of the cold / hot water pipe 14. Reference numeral 15 denotes a cooling water pipe for sequentially flowing the cooling water to the absorber 2 and the condenser 7, and the heat transfer pipes 15 </ b> A and 15 </ b> B formed in a part of the cooling water pipe 15 are respectively connected to the absorber 2 and the condenser. 7 is arranged. Reference numeral 50 is a control device that controls the absorption refrigerator 100 as a whole.

  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. Under the absorber 2, a rare absorbing liquid reservoir 2A is formed in which the diluted absorbing liquid diluted by absorbing the refrigerant vapor is accumulated. The rare absorbing liquid reservoir 2A is controlled by the inverter 51 so that the frequency is variable. One end of the rare absorbent pipe 21 provided with the rare absorbent pump P1 is connected. 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 absorbent pipe 21 passes through the high-temperature heat exchanger 13, and then is branched into a third rare absorbent pipe 21C and a fourth rare absorbent pipe (absorbent liquid pipe) 21D, and the third rare absorbent pipe 21D. The pipe 21C opens to the gas layer part 5B located above the heat exchange part (combustion chamber) 5A formed in the high temperature regenerator 5, and the fourth rare absorbent pipe 21D passes through the exhaust gas heat recovery unit 40. The air layer 5B of the high temperature regenerator 5 is open.

  A gas burner 4 including an igniter 4A that ignites fuel such as city gas and a fuel control valve 4B that controls the amount of fuel to change the amount of heat source is accommodated in the lower portion of the high-temperature regenerator 5. The high-temperature regenerator 5 is formed with a heat exchanging unit 5 </ b> A that heats and regenerates the absorbing liquid using the flame of the gas burner 4 as a heat source above the gas burner 4. An exhaust path 17 through which exhaust gas combusted by the gas burner 4 flows is connected to the heat exchanging section 5A, and an exhaust gas heat recovery device 40 is provided in the exhaust path 17. On the side of the heat exchanging part 5A, an intermediate absorbing liquid reservoir 5C in which the intermediate absorbing liquid heated and regenerated by the heat exchanging part 5A is formed.

  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. 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. The refrigerant pipe 34 is connected. The refrigerant pipe 34 is connected to the downstream side of the refrigerant pump P3 and the absorbing liquid reservoir 2A of the absorber 2 through a refrigerant pipe 35. 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 communication pipe 36 with an on-off valve V3 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 refrigerator is used so that the evaporator 1 outlet side temperature of 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 100 is controlled by the control device 50. Specifically, the control device 50 starts all the pumps P1 to P3, burns the gas in the gas burner 4, and the gas burner 4 so that the temperature of the brine measured by the temperature sensor 61 becomes a predetermined 7 ° C. Control the firepower. During the cooling operation, the on-off valves V1 to V3 are closed.

  The rare absorbent pumped by the rare absorbent pump P1 from the absorber 2 through the rare absorbent pipe 21 passes through the refrigerant drain heat exchanger 16 or the low temperature heat exchanger 12 and the high temperature heat exchanger 13. At the same time, a part is sent to the high temperature regenerator 5 via the exhaust gas heat recovery unit 40. Since the rare absorption liquid conveyed to the high temperature regenerator 5 is heated by the flame and high temperature combustion gas by the gas burner 4 in the high temperature regenerator 5, the refrigerant in the rare absorption liquid evaporates and separates. 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 passing through the inside of the heat transfer tube 14A is cooled, and the brine thus lowered in temperature is A cooling operation such as cooling is performed by supplying the heat load from the cold / hot water pipe 14.
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 refrigerator 100 is set so that the temperature at the outlet side of the evaporator 1 of the 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 is controlled by the control device 50. Specifically, the control device 50 starts all the pumps P1 to P3, burns the gas in the gas burner 4, and the gas burner 4 so that the temperature of the brine measured by the temperature sensor 61 becomes a predetermined 55 ° C. Control the firepower. Further, the circulation of the cooling water to the cooling water pipe 15 is stopped. In the heating operation, the on-off valves V1 to V3 are opened.
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 through the heat transfer tube 14A, and the water flowing inside the heat transfer tube 14A 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 from the refrigerant liquid reservoir 1B at the bottom of the evaporator 1 through the refrigerant pipe 35 by the refrigerant pump P3, and is absorbed in the absorber 2. The refrigerant is mixed with the absorption liquid flowing in from the high temperature regenerator 5 through the liquid pipe 23 and the on-off valve V1, and the refrigerant drain heat exchanger 16 or the low temperature heat exchanger 12 is discharged from the rare absorption liquid pipe 21 by the operation of the rare absorption liquid pump P1. And the high-temperature heat exchanger 13 and a part thereof is sent to the high-temperature regenerator 5 via the exhaust gas heat recovery unit 40.

  In the absorption chiller 100, when the pressure in the exhaust path 17 increases due to the blockage of a flue, chimney, or the like, the temperature rises until the absorption chiller 100 stops operating due to misfire. Since the amount of carbon monoxide generated in the regenerator 5 increases, it is necessary to stop the operation of the absorption chiller 100. Therefore, it is conceivable to provide the pressure detection means 71 for detecting the pressure of the exhaust gas in the exhaust path 17. However, if the pressure sensing unit 71D (see FIG. 2) of the pressure detecting means 71 is constantly in contact with the exhaust gas, the pressure sensing unit 71D may be corroded by a component (for example, sulfur component) contained in the exhaust gas. is there.

  Therefore, in the present embodiment, a branch pipe 72 that branches the exhaust gas from the exhaust path 17 is provided, and the pressure detection means 71 is attached to the branch pipe 72, and the pressure of the exhaust gas is equal to or higher than a predetermined pressure in the branch pipe 72. A damming portion (a liquid reservoir portion 73 described later) is provided that breaks when it becomes. The pressure detection means 71 and the branch pipe 72 constitute a pressure detection unit 70 of the present embodiment. Hereinafter, the pressure detection unit 70 will be described.

FIG. 2 is a schematic diagram showing the pressure detecting means 71. FIG. 3 is a perspective view showing the pressure detection unit 70. 4A and 4B are diagrams showing a part of the branch pipe 72. FIG. 4A is a plan view, FIG. 4B is a front view, and FIG. 4C is a side view.
As shown in FIG. 2, the pressure detection means 71 includes a casing 71A. The casing 71A includes a high-pressure side connection port 71B that guides exhaust gas into the casing 71A, and an outside of the casing 71A (for example, A low-pressure side connection port 71 </ b> C that opens to a machine room in which the absorption refrigerator 100 is disposed. In the housing 71A, a pressure sensing unit 71D interposed between the high-pressure side connection port 71B and the low-pressure side connection port 71C and a switch 71E connected to the pressure sensing unit 71D are provided.

The pressure sensing unit 71D is a sensing unit that moves due to a differential pressure between the pressure of the exhaust gas from the high-pressure side connection port 71B and the external pressure (atmospheric pressure) that the low-pressure side connection port 71C opens. In addition, the pressure demonstrated below shall show a differential pressure | voltage with atmospheric pressure. The pressure sensing unit 71D is formed in a thin plate shape made of, for example, a rubber-based material so that it can be moved by a pressure of about 0 to 300 Pa (in this embodiment, 150 Pa).
The switch 71E is connected to the control device 50, and is activated when a predetermined pressure (500 Pa described later) or more continues for 10 seconds, and outputs the detection result to the control device 50.
As shown in FIG. 3, the pressure detecting means 71 configured in this way is fixed to the exhaust path 17 via a bracket 71F.

  In the present embodiment, the exhaust gas heat recovery device 40 constituting a part of the exhaust path 17 accommodates a part of the fourth rare absorbent pipe 21D (FIG. 1) and flows through the fourth rare absorbent pipe 21D. A heat exchange chamber 40A for heating the rare absorbent with the exhaust gas from the heat exchange section 5A of the high-temperature regenerator 5 and a chimney 40B for exhausting the exhaust gas after heat exchange to the flue section 80 on the equipment side are provided. . A drain pipe 41 that drains the condensed water generated in the chimney 40B and the flue section 80 is connected to the lower part of the chimney 40B.

The branch pipe 72 includes a connection portion 74 connected to the exhaust path 17, a blocking portion (a liquid reservoir portion 73), and the liquid reservoir portion 73 and a high-pressure side connection port 71 </ b> B (FIG. 2) of the pressure detection means 71. A tube 75 to be connected is provided. The connection part 74 is a cylindrical member formed of a material (for example, stainless steel) having corrosion resistance against exhaust gas, and includes a socket (connection port) 76 that can be attached to and detached from the exhaust path 17 at one end. The other end is closed by a lid 77. The socket 76 and the lid 77 are also formed of a material (for example, stainless steel) having corrosion resistance against exhaust gas. The socket 76 is a cylindrical portion having a screw portion 76 </ b> A on the inner surface. The screw portion 76 </ b> A is screwed into a screw portion 74 </ b> A formed on the outer peripheral surface of one end of the connection portion 74, and the socket 76 is fixed to the connection portion 74. Is done. The socket 76 is screwed into the screw portion 42A of the exhaust path side connection port 42 provided in the chimney 40B, so that the connection portion 74 is connected to the exhaust path 17 substantially horizontally.
In this embodiment, since the branch pipe 72 is connected above the drain pipe 41 of the chimney 40B, the condensed water generated in the connection portion 74 is discharged from the drain pipe 41.

  The damming portion of the present embodiment is configured as a liquid reservoir 73 capable of storing the liquid F, and more specifically, is a curved portion curved in a substantially U shape. One end 73A of the liquid reservoir 73 passes through the connecting portion 74 and is fixed in a state protruding from the inner surface of the connecting portion 74, and the other end 73B of the liquid reservoir 73 breaks down when the pressure exceeds a predetermined pressure. Located at height H. For the liquid F, a material that does not easily expand due to the heat of the exhaust gas, such as silicon oil, is used. This liquid F is put into the other end 73 </ b> B of the liquid reservoir 73. Note that the heat of the exhaust gas passing through the exhaust path 17 is about 100 ° C. when the exhaust gas heat recovery device 40 is provided, but the diameters of the connecting portion 74 and the liquid reservoir 73 are small, and in this embodiment, 13 mm each. Therefore, since the exhaust gas hardly flows in the connecting portion 74 in the dammed state, the temperature of the liquid reservoir 73 is about 40 ° C.

  The tube 75 is formed of a material (for example, silicon) that is corrosion resistant to the exhaust gas. One end of the tube 75 is connected to the curved portion, and the other end is connected to the high-pressure side connection port 71B (FIG. 2) of the pressure detecting means 71. Removably connected. The length of the tube 75 from the other end 73B of the liquid reservoir 73 to the high-pressure side connection port 71B is such that the liquid F does not reach the pressure detection means 71 when the liquid reservoir 73 is cut off. It has a predetermined length. The tube 75, the high-pressure side connection port 71 </ b> B, and the liquid reservoir 73 are fixed with a binding band although not shown.

FIG. 5 is a graph showing the relationship between the chimney blockage rate and the exhaust gas pressure. In FIG. 5, the horizontal axis represents the chimney blockage rate and the vertical axis represents the exhaust gas pressure. In FIG. 5, line A shows the result when the combustion load of the absorption chiller 100 is 100%, line B shows the result when the combustion load is 50%, and line C shows the result when the combustion load is 25%. The results are shown.
As shown in this figure, in the absorption refrigeration machine 100, the exhaust gas pressure increases as the chimney blockage rate increases, and the pressure increase increases as the combustion load increases.

In this absorption refrigeration machine 100, when the combustion load is 100%, misfire occurs when the chimney blockage rate is 90% to 100%, but when the combustion load is 25% and 50%, the chimney blockage rate. Misfire does not occur even if becomes 100%. Further, it has been experimentally obtained that the amount of carbon monoxide exceeds a predetermined value (in this embodiment, 100 ppm) when the chimney blockage rate exceeds 92%.
Therefore, by setting the upper limit of the pressure to a predetermined pressure (for example, 50 mmAq (500 Pa)) when the pressure is the lowest when the chimney blockage rate is 92% and the combustion load is 25%, the increase in carbon monoxide Can be prevented.
In the present embodiment, since the sensing pressure at which the pressure sensing unit 71D of the pressure detecting means 71 operates is set to 150 Pa, the liquid reservoir 73 has a weir break pressure that is obtained by subtracting the sensing pressure 150 Pa from the predetermined pressure 500 Pa. In addition, when it exceeds 350 Pa, the weir is cut off.

Next, the operation of this embodiment will be described with reference to FIG.
6A and 6B are explanatory views schematically showing a state in which the branch pipe 72 is out of the weir. FIG. 6A shows a dammed state, FIG. 6B shows a state when the pressure rises, and FIG. It is a figure which shows a cutting | disconnection state.
As shown in FIG. 6A, when the pressure of the exhaust gas is in a normal state, the liquid reservoir 73 is blocked, so that the exhaust gas does not flow to the pressure detection means 71.
When the pressure of the exhaust gas rises, as shown in FIG. 6B, the liquid F in the liquid reservoir 73 is gradually pushed up, and when the pressure of the exhaust gas exceeds the weir-breaking pressure (350 Pa), FIG. ), The liquid F is further pushed up, and the liquid reservoir 73 is cut off.

When the pressure of the exhaust gas further exceeds the sensed pressure (150 Pa) and continues for a predetermined pressure (350 Pa + 150 Pa = 500 Pa) or more for 10 seconds, the switch 71E of the pressure detecting means 71 is activated, and the result is output to the control device 50. The Here, when the pressure of the exhaust gas becomes low before the predetermined pressure or more continues for 10 seconds, the switch 71E of the pressure detecting means 71 does not operate, and the liquid F is in the state shown in FIG. As shown in FIG. 6B, the state returns to the weired state.
When receiving the detection result from the pressure detection means 71, the control device 50 determines that the carbon monoxide amount may exceed a predetermined value, and stops the operation of the absorption chiller 100.

  As described above, according to the present embodiment, the exhaust path 17 that exhausts the exhaust gas from the heat exchange unit 5A of the high-temperature regenerator 5 to the outside, and the branch pipe 72 that branches the exhaust gas from the exhaust path 17 And a pressure detecting means 71 provided on the branch pipe 72 for detecting the pressure of the exhaust gas. The branch pipe 72 has a damming portion (were cut when the pressure of the exhaust gas exceeds a predetermined pressure). A liquid reservoir 73) is provided. With this configuration, the pressure sensing part 71D of the pressure detecting means 71 comes into contact with the exhaust gas only when the pressure of the exhaust gas exceeds a predetermined pressure, and the time for the pressure sensing part 71D to contact the exhaust gas can be shortened. The pressure of the exhaust gas can be detected while preventing corrosion of the pressure sensing unit 71D.

  Further, according to the present embodiment, since the damming portion is the liquid reservoir 73 in which the liquid F is stored, for example, a substantially U-shaped liquid reservoir 73 is formed, and the liquid F is stored in the liquid reservoir 73. Since the damming portion can be formed with a simple configuration that satisfies the above condition, the damming portion can be provided at low cost.

  Further, according to the present embodiment, the branch pipe 72 has such a length that the liquid F does not reach the pressure detection means 71 when the pressure of the exhaust gas becomes equal to or higher than a predetermined pressure. With this configuration, even if the liquid reservoir 73 is cut off, the liquid F does not flow into the pressure detection means 71, so that failure or erroneous detection due to the liquid F entering the pressure detection means 71 can be prevented. Can do.

  Further, according to the present embodiment, since the branch pipe 72 has the socket 76 that is detachably attached to the exhaust path 17, the branch pipe 72 can be easily removed, so that the maintenance of the branch pipe 72 (for example, the branch pipe 72). 72 and cleaning of the liquid F) can be easily performed.

However, the above embodiment is an aspect of the present invention, and it is needless to say that the embodiment can be appropriately changed without departing from the gist of the present invention.
For example, in the above embodiment, the branch pipe 72 is attached to the chimney 40B. However, the branch pipe 72 may be provided in the exhaust path 17 from the high temperature regenerator 5, for example, the flue section 80 downstream of the chimney 40B. May be provided. Further, as shown in FIG. 7, a branch pipe 72 may be attached to the exhaust path 17 that does not include the exhaust gas heat recovery device 40. Note that the heat of the exhaust gas passing through the exhaust path 17 is about 200 to 250 ° C. at maximum in the absence of the exhaust gas heat recovery device 40, but the diameters of the connecting portion 74 and the liquid reservoir portion 73 are small, and this embodiment In the form, since they are about 13 mm and 6 mm, respectively, the exhaust gas hardly flows in the connecting portion 74 in the dammed state, so that the temperature of the liquid reservoir 73 is about 40 ° C.

Moreover, in the said embodiment, although the liquid F of the liquid storage part 73 was demonstrated as silicone oil, this liquid F is not limited to this, Other liquids (for example, water) may be sufficient.
Moreover, in the said embodiment, although the dam part which dams exhaust gas was comprised as the liquid reservoir part 73, a dam part is not limited to this structure, and the pressure of exhaust gas is more than predetermined pressure. For example, it may be a means such as a valve that causes the exhaust gas to flow through the branch pipe 72.

Moreover, although the said embodiment demonstrated the structure provided with the gas burner 4 which burns and burns fuel gas as a heating means which heats absorption liquid in the high temperature regenerator 5, it is not restricted to this, Kerosene or It is good also as a structure provided with the burner which burns A heavy oil, or the structure heated using warm heat, such as a vapor | steam and exhaust gas.
In the above embodiment, the absorption chiller 100 has been described as an absorption chiller / heater that performs cooling and heating operations. However, the absorption chiller 100 is not limited to this, and for example, a cooling It may be an absorption refrigerator that performs only operation.

  Moreover, in the said embodiment, although the absorption refrigerator 100 was formed in what is called a series flow cycle which supplies the absorption liquid which flowed out from the high temperature regenerator 5 to the low temperature regenerator 6, it is not limited to this, For example, An absorption type formed in a so-called parallel flow cycle that branches into two, a high-temperature regenerator and a low-temperature regenerator extending from the absorber, and a so-called reverse flow cycle that supplies the absorption liquid flowing out from the low-temperature regenerator The present invention may be applied to a refrigerator.

  In the above embodiment, the absorption refrigerator 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.

DESCRIPTION OF SYMBOLS 1 Evaporator 2 Absorber 5 High temperature regenerator 5A Heat exchange part (combustion chamber)
6 Low-temperature regenerator 7 Condenser 17 Exhaust path 71 Pressure detection means 72 Branch pipe 73 Liquid reservoir (damming part)
74 Connection port 100 Absorption type refrigerator

Claims (4)

In an absorption refrigerating machine comprising a high-temperature regenerator, a low-temperature regenerator, a condenser, an evaporator, and an absorber, and connecting these pipes to form a circulation path for an absorbing liquid and a refrigerant,
An exhaust path for exhausting exhaust gas from the combustion chamber of the high-temperature regenerator to the outside;
A branch pipe for branching the exhaust gas from the exhaust path;
Provided in the branch pipe, and a pressure detecting means for detecting the pressure of the exhaust gas,
An absorption refrigerating machine, wherein the branch pipe is provided with a damming portion that breaks when a pressure of the exhaust gas exceeds a predetermined pressure.   The absorption chiller according to claim 1, wherein the damming portion is a liquid reservoir that stores a liquid.   3. The absorption refrigerator according to claim 2, wherein the branch pipe has a length that prevents the liquid from reaching the pressure detecting means when the pressure of the exhaust gas becomes equal to or higher than the predetermined pressure. .   The absorption refrigerator according to any one of claims 1 to 3, wherein the branch pipe has a connection port that is detachably attached to the exhaust path.

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