JP3117631B2 - Absorption air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption type air conditioner capable of cooling and heating a room, and more particularly to a technique for extracting non-condensable gas in an absorption type refrigeration cycle.

[0002]

2. Description of the Related Art An absorption refrigeration cycle uses a highly corrosive absorption liquid. Therefore, when corrosion occurs in the absorption refrigeration cycle, insoluble non-condensable gas such as hydrogen gas is generated.
The non-condensable gas generated in the absorption refrigeration cycle is gradually accumulated in the absorber having the lowest internal pressure in the absorption refrigeration cycle. Therefore, the internal pressure of the absorber and the evaporator increases due to the presence of the non-condensable gas. As a result,
The boiling point of the refrigerant in the evaporator rises, the evaporation capacity decreases, and the refrigeration capacity of the absorption refrigeration cycle decreases.

[0003] Therefore, conventionally, there has been proposed an air extraction device for extracting non-condensable gas generated in the absorption refrigeration cycle from the absorption refrigeration cycle. The bleed device uses a part of the absorption liquid of the absorption refrigeration cycle to guide the non-condensable gas accumulated in the absorption refrigeration cycle to the non-condensable gas tank.

[0004]

When a heating operation is performed using an absorption air conditioner, the absorption liquid heated by the heating means is guided to the evaporator. Then, since the saturated vapor pressure in the evaporator and the absorber increases, the absorbing liquid evaporates and the pressure increases. Here, the non-condensable gas tank of the bleed device is
It is connected via a gas-liquid separator to an absorber in which non-condensable gas easily accumulates.

[0005] Therefore, when the heating operation is performed, the heated absorption liquid in the absorber flows into the non-condensable gas tank through the gas-liquid separator due to a rise in the pressure in the absorber. When a high-temperature absorbing liquid flows into the non-condensing gas tank, if the pressure in the non-condensing gas tank is low, the flowing absorbing liquid reaches a saturated vapor pressure corresponding to the temperature of the absorbing liquid and reaches an equilibrium state. Causes a boiling phenomenon.

[0006] The non-condensing gas tank is arranged outside the absorption refrigeration cycle, and has a low outside air temperature when performing a heating operation. In this state, if a high-temperature absorbent flows into the non-condensable gas tank, the vapor of the absorbed liquid deprives the heat of the surroundings of the non-condensable gas tank, condenses, and the internal pressure decreases, so the equilibrium state is reached. It collapses and causes a boiling phenomenon again.

That is, in the conventional absorption air conditioner, when the heating operation is performed, the absorption liquid having a high temperature enters the non-condensable gas tank, and the vapor of the absorption liquid is cooled and condensed to lower the internal pressure. Then, the action of causing the high-temperature absorbing liquid to flow into the non-condensable gas tank whose internal pressure is reduced and causing the boiling phenomenon until the saturated vapor pressure is reached repeatedly occurs.

On the other hand, when a boiling phenomenon occurs in the non-condensable gas tank, bubbles generated by the boiling hit the non-condensable gas tank, and abnormal noise is generated. That is, during the heating operation, the boiling phenomenon occurs intermittently in the non-condensable gas tank. Therefore, during the heating operation, a problem occurs in which abnormal noise occurs intermittently in the non-condensable gas tank.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a low-noise absorption air conditioner capable of suppressing intermittent noise generated in an uncondensable gas tank during a heating operation. In the offer.

[0010]

Means for Solving the Problems The absorption type air conditioner of the present invention employs the following technical means to achieve the above object. The absorption-type air conditioner includes: a) heating means for heating the absorption liquid; b) a regenerator for heating the absorption liquid with the heating means to vaporize a part of the absorption liquid; A condenser that cools and liquefies, an evaporator that evaporates the liquefied refrigerant liquefied by the condenser under low pressure, an absorber that absorbs the vaporized refrigerant evaporated by the evaporator into an absorbent, and an absorbent that absorbs the liquid in the absorber. An absorption refrigeration cycle having a solution pump for pumping to the regenerator; c) an indoor heat exchanger installed inside the room for exchanging heat between indoor air and a heat medium, and when the liquefied refrigerant evaporates in the evaporator. ,
A heat medium circuit that guides the heat medium that has been deprived of the latent heat of evaporation and is cooled to the indoor heat exchanger, and guides the heat medium that has passed through the indoor heat exchanger to the evaporator again, provided in this heat medium circuit. An air conditioning unit having a heat medium pump for circulating a heat medium, and d) extracting non-condensable gas in the absorption refrigeration cycle and supplying it to a non-condensable gas tank disposed outside the absorption refrigeration cycle. And a bleeding device.

Further, the absorption type air conditioner is configured to guide the absorbing liquid heated by the heating means to the evaporator, and to heat the heat medium supplied from the evaporator to the indoor heat exchanger, whereby the indoor air is cooled. A heating operation for heating is provided. The non-condensable gas tank is provided so as to be covered with heat insulating means for preventing heat transmission, and the non-condensable gas tank is provided so as to insulate the surrounding air.

[0012]

When the heating operation is performed using the absorption type air conditioner, the absorbing liquid heated by the heating means is guided to the evaporator, and the vapor pressure of the absorbing liquid is increased, so that the evaporator and the absorbing liquid are heated. The pressure inside rises. Since the non-condensing gas tank is connected to the absorption refrigeration cycle, when the heating operation is performed, a part of the heated absorption liquid in the evaporator and the absorber is reduced due to the pressure increase in the evaporator and the absorber. It flows into the non-condensing gas tank.

When the high-temperature absorbent flows into the non-condensable gas tank, the non-condensable gas tank is insulated from the surrounding air by the heat insulating means. Cooling at the wall does not cause condensation, the vapor pressure in the non-condensable gas tank does not decrease, and the inside of the non-condensable gas tank is maintained at the saturated vapor pressure.

As described above, since the inside of the non-condensable gas tank is maintained at the saturated vapor pressure, the inflow of the absorbent into the non-condensable gas tank is suppressed. The absorption liquid flowing into the gas tank does not boil. As a result, during the heating operation, the generation of the intermittent abnormal noise due to the boiling generated in the past can be suppressed, and as a result, the noise in the heating operation can be significantly suppressed as compared with the conventional case.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an absorption type air conditioner of the present invention will be described based on an embodiment shown in the drawings. FIG. 1 and FIG. 2 show an embodiment, and FIG. 2 is a schematic configuration diagram of an absorption air conditioner using a double effect absorption refrigeration cycle for performing indoor air conditioning.

(Schematic description of absorption type air conditioner 1) The absorption type air conditioner 1 to which this embodiment is applied is a relatively small one used for home use or the like. In this example, a heating means 2 for heating lithium bromide aqueous solution, a double effect absorption refrigeration cycle 3, and cold / hot water cooled or heated by the absorption refrigeration cycle 3 (a heat medium for cooling / heating the room; An indoor air-conditioning unit 4 for air-conditioning the room with water in the embodiment, and cooling for cooling the cooling water used for cooling and liquefying the vaporized refrigerant (steam in this embodiment) in the absorption refrigeration cycle 3. It comprises a water cooling means 5 and a control device 6 for controlling each mounted electric functional component.

(Explanation of Heating Means 2) The heating means 2 of this embodiment is a gas combustion device which burns a gas serving as a fuel to generate heat and heats the absorbing liquid by the generated heat. The gas burner 11 includes a gas supply unit 12 that supplies gas to the gas burner 11, a combustion fan 13 that supplies air for combustion to the gas burner 11, and the like.
Then, the heat obtained by the gas combustion of the gas burner 11 heats the boiler 14 of the absorption refrigeration cycle 3, and the boiler 14
It is provided so as to heat the low-concentration absorption liquid (hereinafter, low liquid) supplied to the inside.

(Explanation of the Absorption Refrigeration Cycle 3) The absorption refrigeration cycle 3 includes a boiler 14 heated by the heating means 2, and the low liquid supplied into the boiler 14 is heated to reduce the temperature. A high-temperature regenerator 15 that evaporates (evaporates) a refrigerant (water) contained in the liquid into a medium-concentration absorbing liquid (hereinafter, medium liquid), and utilizes heat of condensation of the vaporized refrigerant in the high-temperature regenerator 15, A low-temperature regenerator 16 that heats an intermediate liquid supplied from the high-temperature regenerator 15 using a pressure difference, vaporizes a refrigerant contained in the intermediate liquid, and turns the intermediate liquid into a high-concentration absorbing liquid (hereinafter, high liquid). A condenser 17 for cooling and liquefying the vaporized refrigerant (steam) from the high-temperature regenerator 15 and the low-temperature regenerator 16;
An evaporator 18 for evaporating the liquefied refrigerant (water) liquefied by the condenser 17 under a pressure close to vacuum, and an absorption for absorbing the vaporized refrigerant evaporated by the evaporator 18 to the high liquid obtained by the low-temperature regenerator 16. And a vessel 19.

(Explanation of the high-temperature regenerator 15)
Is a boiler 1 for heating the low liquid by the heating means 2.
4, and a boiling cylinder 21 extending upward from the boiler 14
Is provided. The vaporized refrigerant that has been boiled in the boiler 14 and the boiling cylinder 21 and vaporized from the low liquid is blown out from the boiling cylinder 21 into the cylindrical high-temperature regeneration container 22. The high-temperature vaporized refrigerant blown into the high-temperature regeneration container 22 is
Through the second wall, heat is taken away as heat of vaporization when the middle liquid in the low-temperature regenerator 16 evaporates and is cooled to become a liquefied refrigerant (water).

In the high-temperature regenerating vessel 22, the medium liquid in the boiling cylinder 21 after the refrigerant in the low liquid is vaporized by being heated by the boiler 14 and the liquefied refrigerant (water) stored in the surroundings are insulated. For this purpose, a heat insulating partition tube 24 is provided around the boiling tube 21. The heat insulating partition tube 24 has an upper end joined to the upper end of the boiling tube 21, a lower end provided with a gap from the boiling tube 21, and air for heat insulation between the boiling tube 21 and the heat insulating partition tube 24. Provided to penetrate. The liquefied refrigerant (water) liquefied in the high-temperature regeneration container 22 and separated outside the heat insulating partition tube 24 is guided to the condenser 17 through a liquid refrigerant pipe 25 connected to a lower portion.

(Explanation of the low-temperature regenerator 16)
Includes a cylindrical low-temperature regeneration container 31 covering the high-temperature regeneration container 22. On the other hand, the middle liquid in the boiling cylinder 21 is supplied to the low-temperature regenerator 16 through a middle liquid pipe 26 connected to a lower part of the boiling cylinder 21. The middle liquid pipe 26 is provided with a throttle means 27 such as an orifice. This aperture means 27
When the cooling / heating switching valve 53 described later is closed, the medium flows while maintaining the pressure difference between the high-temperature regenerator 15 and the low-temperature regenerator 16. Do not shed.

In the low-temperature regenerator 16, the intermediate liquid supplied through the intermediate liquid pipe 26 is injected toward the ceiling of the high-temperature regeneration container 22. Since the temperature in the low-temperature regeneration container 31 is lower than the temperature of the high-temperature regeneration container 22, the pressure in the low-temperature regeneration container 31 is lower than the pressure in the high-temperature regeneration container 22. Therefore, the middle liquid supplied from the middle liquid pipe 26 into the low-temperature regeneration container 31 is easily evaporated. Then, when the middle liquid is injected into the ceiling of the high temperature regeneration container 22, the middle liquid is heated by the wall of the high temperature regeneration container 22, and a part of the refrigerant contained in the middle liquid evaporates to become a vaporized refrigerant, Becomes high liquid.

Here, the upper part of the low-temperature regeneration container 31 communicates with the upper part of the condensing container 32 in the shape of an annular container through a communication part 33. Therefore, the vaporized refrigerant evaporated in the low-temperature regeneration container 31 is supplied into the condensation container 32 through the communication portion 33. On the other hand, the high liquid falls to the lower part of the low temperature regeneration container 31 and is supplied to the absorber 19 through the high liquid pipe 34 connected to the lower part of the low temperature regeneration container 31. In addition, the low temperature regeneration container 3
1, a ceiling plate 35 is provided.
A gap 36 through which the vaporized refrigerant passes is provided between the outer peripheral end of 5 and the low temperature regeneration container 31.

(Explanation of the Condenser 17) The condenser 17 is covered by an annular container-shaped condensing container 32. Inside the condensing container 32, a condensing heat exchanger 37 for cooling and liquefying the vaporized refrigerant in the condensing container 32 is arranged. The condensing heat exchanger 37 is an annular coil through which cooling water flows. The vaporized refrigerant supplied from the low-temperature regenerator 16 into the condensing container 32 is supplied to the condensing heat exchanger 3.
The mixture is cooled and liquefied by 7 and dropped below the condensing heat exchanger 37.

On the other hand, a refrigerant is supplied to the lower side of the condensing container 32 from the high temperature regenerator 15 through the liquid refrigerant pipe 25. When the supplied refrigerant is supplied into the condensing container 32, the pressure difference (the pressure inside the condensing container 32 is about 70 mmHg).
From low pressure), the mixture is reboiled, and supplied in a state where the vaporized refrigerant and the liquefied refrigerant are mixed. Further, a liquid refrigerant supply pipe 38 for guiding the liquefied refrigerant to the evaporator 18 is connected to the condensation container 32. The liquid refrigerant supply pipe 38 is provided with a refrigerant valve 39 for adjusting the supply amount of the liquefied refrigerant supplied from the condensation container 32 to the evaporator 18.

(Explanation of the evaporator 18) The evaporator 18 is provided at the lower part of the condensing container 32 together with the absorber 19, and is constituted by an annular-shaped evaporative absorption container 41 provided around the low-temperature regeneration container 31. Covered. An evaporation heat exchanger 42 for evaporating the liquefied refrigerant supplied from the condenser 17 is disposed outside the inside of the evaporation absorption container 41. This evaporating heat exchanger 42 is an annular coil,
Cold and hot water (heat medium) supplied to the indoor air-conditioning means 4 inside
Flows. The liquefied refrigerant supplied from the condenser 17 via the liquid refrigerant supply pipe 38 is disposed above the evaporating heat exchanger 42, and is supplied from the annular refrigerant spraying tool 43 having a large number of spray pipes 43a. Sprayed on the evaporating heat exchanger 42.

Since the inside of the evaporative absorption container 41 is kept substantially at a vacuum (for example, 6.5 mmHg), the boiling point is low, and the liquefied refrigerant sprayed to the evaporating heat exchanger 42 is very likely to evaporate. The liquefied refrigerant sprayed on the evaporating heat exchanger 42 evaporates by removing heat of vaporization from the heat medium flowing in the evaporating heat exchanger 42. As a result, the heat medium flowing in the evaporating heat exchanger 42 is cooled. Then, the cooled heat medium is guided to the indoor air conditioner 4 to cool the room.

(Explanation of the Absorber 19) The absorber 19 is covered with the evaporation absorption container 41 as described above. The absorber 19 is provided inside the evaporative absorption container 41 with the high liquid pipe 3.
An absorption heat exchanger 44 for cooling the high liquid supplied from 4 is arranged. The heat exchanger 44 for absorption is an annular coil, and the inside thereof is supplied with cooling water for cooling the high liquid sprayed on the coil. After passing through the heat exchanger 44 for absorption, the cooling water passes through the heat exchanger 37 for condensation of the condenser 17 and is guided to the cooling water cooling means 5 to be cooled. Then, the cooling water cooled by the cooling water cooling means 5 is guided again to the absorption heat exchanger 44.

On the other hand, a large number of spray pipes 45a are provided above the absorption heat exchanger 44, and the high liquid supplied from the high liquid pipe 34 is supplied to the absorption heat exchanger 44 via the spray pipe 45a. An annular absorbent spraying tool 45 for spraying is arranged. The high liquid sprayed on the absorption heat exchanger 44 is
While falling down from the top along the coil surface of the
The evaporating refrigerant generated by the evaporation in the evaporating heat exchanger 42 is absorbed. As a result, the absorption liquid that has fallen to the bottom of the evaporative absorption container 41 becomes a low-concentration liquid.

Inside the evaporative absorption container 41, a cylindrical partition wall 4 is provided between the evaporating heat exchanger 42 and the absorbing heat exchanger 44.
6 are arranged. The cylindrical partition wall 46 communicates with the inside of the evaporation absorption container 41 only at the upper side, and the vaporized refrigerant generated by the evaporator 18 is guided into the absorber 19 through the upper part of the cylindrical partition wall 46. .

A low liquid pipe 47 for supplying the low liquid at the bottom of the evaporative absorption container 41 to the boiler 14 is connected to the bottom of the evaporative absorption container 41. The low liquid pipe 47 is provided with a solution pump 48 for flowing the low liquid from the inside of the evaporation absorption container 41 in a substantially vacuum state toward the boiler 14.

(Description of other components in absorption refrigeration cycle 3) Reference numeral 51 shown in FIG.
A high-temperature heat exchanger 51 for exchanging heat between the medium liquid flowing from inside to the low-temperature regenerator 16 and the low liquid flowing from the absorber 19 to the boiler 14.
a, and a low-temperature heat exchanger 51b for exchanging heat between the high liquid flowing from the low-temperature regenerator 16 to the absorber 19 and the low liquid flowing from the absorber 19 to the boiler 14. The high-temperature heat exchanger 51a cools the middle liquid flowing from the boiling cylinder 21 to the low-temperature regenerator 16 and heats the low liquid flowing from the absorber 19 to the boiler 14. The low-temperature heat exchanger 51b cools the high liquid flowing from the low-temperature regenerator 16 to the absorber 19 and heats the low liquid flowing from the absorber 19 to the boiler 14.

The absorption refrigeration cycle 3 of this embodiment is provided with heating operation means for performing a heating operation in addition to the cooling operation by the above-described operation. The heating operation means includes a heating pipe 52 for guiding the high-temperature absorbing liquid from the lower part of the boiling cylinder 21 to a lower part of the evaporator 18, and a cooling / heating switching valve 53 for opening and closing the heating pipe 52. The cooling / heating switching valve 53 opens during the heating operation to guide the high-temperature absorbing liquid into the evaporating / absorbing container 41 and heat the cold / hot water flowing in the evaporating heat exchanger 42 of the evaporator 18.

(Explanation of the indoor air-conditioning means 4)
Is forcibly exchanging heat between the cold and hot water passing through the indoor heat exchanger 54 installed in the room and the evaporator 18 flowing through the indoor heat exchanger 54 and the room air, and blowing the air after the heat exchange into the room. And an indoor fan 55 for causing the indoor fan 55 to operate.

A cold / hot water circuit 56 (corresponding to a heat medium circuit) for circulating cold / hot water is connected to the indoor heat exchanger 54, and a cold / hot water pump 57 ( (Corresponding to a heat medium pump). The cold / hot water pump 57 is driven by a motor that also drives the solution pump 48.

The cold / hot water circuit 56 is a water pipe that guides the cold / hot water that has passed through the evaporator 18 to the indoor heat exchanger 54 and guides the cold / hot water that has exchanged heat with the room air to the evaporator 18 again. Inside, the indoor heat exchanger 54 and the cold / hot water pump 57
In addition, a cistern 58 for storing cold / hot water and replenishing cold / hot water in the cold / hot water circuit 56 is provided while functioning as an expansion tank for heating.

A water supply pipe 59 for supplying cold / hot water (tap water) to the inside is connected to the cistern 58. In this water supply pipe 59, supply of cold and hot water into the cistern 58,
A water supply valve 60 for stopping is provided. The cistern 58 includes a water level sensor (not shown).
To open and refill the cistern 58 with cold and hot water. Further, the cistern 58 is provided with overflow water supply means 59a for guiding the overflowed cold / hot water into a cooling water tank 65 described later.

(Description of Cooling Water Cooling Means 5) The cooling water cooling means 5 includes an evaporative cooling tower 61, a cooling water circuit 62 for circulating cooling water, and a cooling water for circulating cooling water in the cooling water circuit 62. A pump 63 is provided. The cooling tower 61 allows the cooling water that has passed through the absorber 19 and the condenser 17 to flow downward from above, exchange heat with the outside air while flowing, and release heat, and partially evaporate while flowing. In this case, heat of vaporization is taken from the cooling water flowing at the time of evaporation to cool the flowing cooling water. The cooling tower 61 includes a cooling water fan 64 that generates an air flow and promotes evaporation and cooling of the cooling water.

The cooling water circuit 62 passes the cooling water, which has passed through the absorber 19 and the condenser 17 and has risen in temperature, to the cooling tower 6.
1 and sends the cooling water cooled by the cooling tower 61 to the absorber 19 and the condenser 17 again. In the cooling water circuit 62, in addition to the cooling tower 61 and the cooling water pump 63,
A cooling water tank 65 for storing cooling water is provided.

The cooling water tank 65 is installed below the cooling tower 61 and below the cistern 58,
The cooling water passing through 1 is supplied, and the water overflowing in the cistern 58 is supplied. The cooling water tank 65 is provided with a water level sensor (not shown). When the level of the cooling water in the cooling water tank 65 decreases, the water supply valve 60 is opened to overflow the water from the cistern 58, and the overflowed water is supplied to the overflow water supply means. 59
The cooling water is supplied to the inside of the cooling water tank 65 from a.

(Explanation of the control device 6) The control device 6 includes the above-described refrigerant valve 39, solution pump 48 (cold / hot water pump 57),
Electric functional parts such as the indoor fan 55, the cooling / heating switching valve 53, the water supply valve 60, the cooling water pump 63, the cooling water fan 64, and the electric functional parts of the heating means 2 (combustion fan 1
3. Gas control valve 66, gas on-off valve 67, ignition device 68
) Is controlled in accordance with an operation instruction of a controller (not shown) manually set by a user or an input signal of each of a plurality of sensors.

(Explanation of Bleed Device 70) Absorption Air Conditioner 1
As shown in FIG. 1, a gas extraction device 70 is provided for extracting and storing non-condensable gas such as hydrogen generated by corrosion in the absorption refrigeration cycle 3 from the absorption refrigeration cycle 3. The bleeding device 70 includes an auxiliary absorber 71 for alternately flowing the non-condensable gas extracted from the absorption refrigeration cycle 3 and the absorbent.
A gas-liquid separator 72 for separating the non-condensable gas and the absorption liquid supplied from the auxiliary absorber 71;
Non-condensable gas tank 7 for storing the non-condensable gas separated in 2
And 3.

The auxiliary absorber 71 is disposed in the absorber 19, and is a non-condensable gas in the absorption refrigeration cycle 3 (in this embodiment, a non-condensable gas collected in a lower portion of the absorber 19).
A gas introduction passage 74 for introducing the liquid is connected, and an absorption liquid introduction passage 75 for introducing the high liquid (absorption liquid) supplied to the absorption liquid spraying tool 45 is connected. Gas-liquid discharge passage 76 for allowing
Is connected.

The upper end of the absorbing liquid introduction passage 75 is joined to the absorbing liquid spraying device 45, and is connected to the upper end of the auxiliary absorber 71 via an orifice 75a. The gas-liquid discharge passage 7
The upper end of 6 is provided in an inverted substantially U-shape with the end directed downward, and when the liquid level of the absorbing liquid in the auxiliary absorber 71 rises and reaches the highest liquid level of the gas-liquid discharge passage 76. By the siphon action, the absorbing liquid collectively falls through the gas-liquid discharge passage 76 to the gas-liquid separator 72 until the liquid level reaches the liquid level at the opening end of the gas-liquid discharge passage 76. At this time, the gas in the auxiliary absorber 71 is sucked into the gas-liquid discharge passage 76. Then, when the absorbing liquid falls by the next siphon action, it falls while pushing the gas sucked into the gas-liquid discharge passage 76 as described above. Therefore, the gas and the absorbing liquid alternately flow out in the gas-liquid discharging passage 76. When the gas in the auxiliary absorber 71 is sucked into the gas-liquid discharge passage 76, the non-condensable gas accumulated in the lower part of the absorber 19 becomes
The gas is sucked into the auxiliary absorber 71 via the gas introduction passage 74.

The auxiliary absorber 71 removes the heat of absorption generated when the vaporized refrigerant introduced together with the non-condensable gas is absorbed by the absorbing liquid, and prevents the absorption capacity from lowering. Cooling means (not shown) for separating cooling water from the coil of the absorbent heat exchanger 44 for cooling the heat exchanger 71
Is provided.

(Description of Non-Condensable Gas Tank 73) The non-condensable gas tank 73 is a container arranged outside the absorption refrigeration cycle 3 as shown in FIG.
Is provided above the level of the liquid level of the absorbing liquid in the absorber 19 so that the non-condensable gas can be stored in the non-condensable gas tank 73. The non-condensable gas tank 73 is provided with a maintenance valve (not shown), through which non-condensable gas is extracted at a predetermined time.

The non-condensable gas tank 73 is provided so as to be covered with a heat insulating means A for preventing heat transmission, and the non-condensable gas tank 73 is provided so as to insulate the surrounding air. As an example of the heat insulating means A, for example, glass wool,
A method of covering the entire area around the non-condensable gas tank 73 with a member having a low heat transfer coefficient, such as felt or ceramic, or providing a vacuum layer, an inert gas layer, an air layer, or the like around the non-condensable gas tank 73 to form the non-condensable gas tank 73 There is an insulation method using a double wall for insulation. It should be noted that a heat insulating means A may be provided in a portion of the connecting pipe 78 described later, which is above the liquid level and in which the non-condensable gas exists (at least up to the bottom of the absorber 19), for the same reason.

(Description of Gas-Liquid Separator 72) As shown in FIG. 1, the gas-liquid separator 72 of this embodiment is disposed below the absorber 19 and the non-condensable gas tank 73. , A large-diameter round tubular connecting pipe 78 connecting the lower part of the non-condensable gas tank 73, and an auxiliary absorber 71 inside the absorber 19.
The non-condensable gas and the absorbing liquid which are drawn out of the connecting pipe 78 and inserted through the connecting pipe 78 and flow out from the auxiliary absorber 71 through the gas-liquid discharge passage 76 rise toward the non-condensing gas tank 73 in the connecting pipe 78. And a small-diameter round tubular small-diameter tube 79 leading to a portion to be formed. Note that, as in the present embodiment, the gas-liquid discharge passage 76 and the small-diameter pipe 79 may be provided by one pipe, or the gas-liquid discharge passage 76 and the small-diameter pipe 79 may be provided separately, and the absorber may be provided. The connection may be made within the connection pipe 19 or the connection pipe 78.

As described above, the open end of the small diameter pipe 79 is set at a portion that rises toward the non-condensable gas tank 73 in the connection pipe 78. Therefore, the non-condensable gas discharged from the small-diameter pipe 79 rises in the absorbent and is separated from the absorbent, and is guided to the upper non-condensable gas tank 73 through the connection pipe 78. Note that the opening end of the small diameter pipe 79 may be set below the liquid level, or may be set above the liquid level. However, in order to smoothly carry out the siphon action of the auxiliary absorber 71, a large head difference can be taken, so that the opening end is preferably lower.

In the cooling operation, the pressure in the evaporative absorption container 41 and the pressure in the non-condensable gas tank 73 are substantially equal to each other. The action of equalizing the liquid level in the connection pipe 78 works to move the absorbing liquid.
It is returned to 9. By protruding the tip of the connection pipe 78 on the absorber 19 side from the bottom of the absorber 19, it is possible to prevent dust or the like in the absorber 19 from flowing into the connection pipe 78.

[Operation of Embodiment] Next, the operation of the cooling operation by the absorption type air conditioner 1 of this embodiment, the operation of the bleed device 70 when performing the cooling operation, and the operation according to the present invention in the heating operation will be described. explain. (Explanation of operation of cooling operation) When the cooling operation is instructed by the controller, the heating means 2 and the absorption refrigeration cycle 3 are operated by the operation of each electric functional component. In the absorption refrigeration cycle 3, when the heating means 2 heats the boiler 14, the high-temperature regenerator 15 takes out the vaporized refrigerant from the low liquid and the low-temperature regenerator 16 takes out the high liquid from the middle liquid. .

The vaporized refrigerant taken out by the high-temperature regenerator 15 and the low-temperature regenerator 16 is condensed and liquefied by the condenser 17 and then dispersed to the evaporator heat exchanger 42 of the evaporator 18 to be evaporated. The heat of vaporization is taken from the cold and hot water in 42 to evaporate. Therefore, the cooled hot and cold water that has passed through the evaporating heat exchanger 42 and is cooled is supplied to the indoor heat exchanger 54 of the indoor air conditioner 4 to cool the room.

The vaporized refrigerant evaporated in the evaporator 18 passes above the cylindrical partition wall 46 and flows into the absorber 19.
On the other hand, in the absorber 19, the high liquid taken out by the low-temperature regenerator 16 is absorbed by the absorbing heat exchanger 44 through the absorbing liquid spraying tool 45.
The vaporized refrigerant flowing from the evaporator 18 is absorbed by the high liquid. Note that the absorption heat generated when the vaporized refrigerant is absorbed by the high liquid is absorbed by the absorption heat exchanger 44, thereby preventing the absorption capacity from lowering. The high liquid that has absorbed the vaporized refrigerant in the absorber 19 becomes a low liquid, is sucked in by the solution pump 48, and is returned to the evaporator 14 again.
Repeat the above cycle.

(Explanation of the operation of the air extraction device 70) During the cooling operation by the absorption refrigeration cycle 3, since the vaporized refrigerant is absorbed by the high liquid, the inside of the absorber 19 is in a negative pressure state as compared with the inside of the evaporator 18. When the vaporized refrigerant evaporated in the evaporator 18 passes above the cylindrical partition wall 46 and flows into the absorber 19, as shown in FIG.
The airflow indicated by the arrow α is generated. On the other hand, in the absorption refrigeration cycle 3, the corrosion is slightly generated due to the action of the highly corrosive absorbing liquid, and non-condensable gas is generated. The generated non-condensable gas is stored in the lower part of the absorber 19 by the airflow indicated by the arrow α in FIG.

During the operation of the absorption refrigeration cycle 3, a part of the high liquid supplied to the absorption liquid sprayer 45 is supplied from the absorption liquid introduction passage 75 into the auxiliary absorber 71 through the orifice 75a. Then, the liquid level of the high liquid in the auxiliary absorber 71 gradually rises. Then, when the liquid level of the high liquid reaches the top of the gas-liquid discharge passage 76, the high liquid flows into the gas-liquid discharge passage 76 by a siphon action, and the liquid surface in the auxiliary absorber 71 becomes
The high liquid that has flowed into the gas-liquid discharge passage 76 falls downward from the gas-liquid discharge passage 76 until it descends to the open end of the gas-liquid discharge passage 76. The gas in the auxiliary absorber 71 is sucked into the gas-liquid discharge passage 76 by the action of the high liquid dropping through the gas-liquid discharge passage 76. Then, at the next drop of the high liquid, the gas in the gas-liquid discharge passage 76 is pushed out into the connection pipe 78 via the small diameter pipe 79 and is guided into the upper non-condensable gas tank 73.

Further, the absorbent flowing down the gas-liquid discharge passage 76 and discharged from the small-diameter pipe 79 is supplied to the inside of the connection pipe 78 and the absorber 1.
Since the liquid level in 9 works so as to be the same, the absorbing liquid is returned to the absorber 19 by the increase of the absorbing liquid inside the connecting pipe 78 on the side rising toward the non-condensable gas tank 73. On the other hand, when the gas in the auxiliary absorber 71 is sucked into the gas-liquid discharge passage 76, the non-condensable gas accumulated in the lower part of the absorber 19 is sucked into the auxiliary absorber 71 from the gas introduction passage 74.

(Explanation of the Heating Operation) When the heating operation is instructed by the controller, the heating means 2 is operated, the solution pump 48 (the cold / hot water pump 57) and the indoor fan 55 are turned on, and the cooling / heating switching valve 53 is turned on. be opened. When the heating means 2 heats the evaporator 14, the high-temperature absorbing liquid heated by the evaporator 14 is supplied to the evaporator 1 through the heating pipe 52.
8, the cold and hot water flowing in the evaporating heat exchanger 42 of the evaporator 18 is heated. For this reason, the cold and hot water heated by passing through the evaporating heat exchanger 42 is supplied to the indoor heat exchanger 54 of the indoor air-conditioning means 4 to heat the room.

During the heating operation, the absorbing liquid heated by the heating means 2 is guided to the evaporator 18 as described above, so that the pressures in the evaporator 18 and the absorber 19 increase. Here, the non-condensing gas tank 73 includes a gas-liquid separator 72.
Is connected to the bottom of the absorber 19 through the connecting pipe 78 of the above, the high temperature absorbing liquid accumulated at the bottom of the absorber 19 due to the pressure increase in the evaporator 18 and the absorber 19 during the heating operation, Non-condensable gas tank 7 via connecting pipe 78
It is extruded into 3.

The non-condensable gas tank 73
When the liquid flows into the non-condensable gas tank 73, the absorption liquid in the non-condensable gas tank 73 boils. When the inside of the non-condensable gas tank 73 reaches a saturated vapor pressure, an equilibrium state is established, and the boiling stops. When the non-condensable gas tank 73 is insulated from the surrounding outside air by the heat insulating means A, the vapor of the absorbing liquid in the non-condensable gas tank 73 is absorbed by the heat of the non-condensable gas tank 73 being removed from the surroundings. Since the condensation of the liquid vapor does not occur and the inside of the non-condensable gas tank 73 is maintained at the saturated vapor pressure, re-boiling does not occur.

As described above, during the heating operation, the pressure in the non-condensable gas tank 73 is maintained at the saturated vapor pressure, so that the inflow of the absorbent into the non-condensable gas tank 73 is suppressed. Even when the gas enters the gas tank 73, the absorption liquid does not boil because the non-condensable gas tank 73 has a saturated vapor pressure.

[Effects of Embodiment] As shown in this embodiment, during the heating operation, the pressure in the non-condensable gas tank 73 is maintained at the saturated vapor pressure, so that the non-condensable gas tank 7
3 is suppressed, and even if the heated absorbent flows into the non-condensable gas tank 73, the absorbent flowing into the non-condensable gas tank 73 does not boil. Intermittent generation of abnormal noise due to the boiling that occurs at the time is suppressed. As a result, the noise in the non-condensable gas tank 73 during the heating operation can be significantly suppressed as compared with the related art, and the absorption air conditioner 1 during the heating operation can be suppressed.
Can have low noise.

[Modification] In the above embodiment, as an example of the gas-liquid separator 72, an example of the double pipe structure in which the small diameter pipe 79 is inserted inside the connection pipe 78 is shown. As shown in FIG. 4, a small-diameter pipe 79 may be connected by welding to the middle of the connecting pipe 78, or as shown in FIG. A gas discharge pipe 82 for guiding the gas in 81 to a non-condensable gas tank 73 (see the embodiment), and an absorbent 19 in the container 81
A gas-liquid separator 72 having another structure, such as a structure in which an absorption liquid return pipe 83 leading to the embodiment (see the embodiment) is connected, may be used.

In the above embodiment, the non-condensable gas is supplied to the absorber 1
Although the example in which the gas inlet passage 74 is provided so as to accumulate at the lower portion of the gas inlet 9 and the gas suction passage 74 is provided at the lower portion of the absorber 19 is shown, non-condensable gas is supplied to other portions (for example, the upper portion of the absorber). It may be provided so as to store the gas, and an opening for sucking the gas in the gas introduction passage 74 may be provided in a portion where the non-condensable gas is stored.

In the above embodiment, the double-effect absorption refrigeration cycle 3 has been described as an example of the absorption-type refrigeration cycle. However, a single-effect absorption refrigeration cycle may be used.
A triple effect or more multi-effect absorption refrigeration cycle may be used.
In addition, when the middle liquid is injected into the low-temperature regenerator 16, the example has been described in which the medium is injected from above the low-temperature regenerator 16, but may be injected from below.

As a heating source of the heating means 2, a gas burner 11
However, an oil burner or an electric heater may be used, or exhaust heat of another device (for example, an internal combustion engine) may be used. Although the example in which the heat exchanger for condensation 37, the heat exchanger for evaporation 42, and the heat exchanger for absorption 44 are provided in a coil shape has been described, other types of heat exchangers such as a tube and fin or a stacked heat exchanger are used. May be used.

Although an aqueous solution of lithium bromide has been described as an example of the absorbing solution, other absorbing solutions such as an aqueous ammonia solution using ammonia as a refrigerant and water as an absorbent may be used. As an example of the heat medium, tap water is used and shared with the cooling water in the cooling water circuit. However, other heat medium such as antifreeze or oil different from the cooling water in the cooling water circuit may be used.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an air extraction device (embodiment).

FIG. 2 is a schematic configuration diagram of an absorption type air conditioner (Example).

FIG. 3 is a sectional view of a gas-liquid separator (modification).

FIG. 4 is a sectional view of a gas-liquid separator (modification).

FIG. 5 is a sectional view of a gas-liquid separator (modification).

[Explanation of symbols]

 A Heat insulation means 1 Absorption air conditioner 2 Heating means 3 Absorption refrigeration cycle 4 Indoor air conditioning means 15 High temperature regenerator 16 Low temperature regenerator 17 Condenser 18 Evaporator 19 Absorber 48 Solution pump 54 Indoor heat exchanger 56 Cold and hot water circuit ( Heat medium circuit) 57 Cold / hot water pump (heat medium pump) 70 Bleed device 71 Auxiliary absorber 72 Gas-liquid separator 73 Non-condensing gas tank

Claims (1)

(57) [Claims] A) a heating means for heating the absorbing liquid; b) a regenerator for heating the absorbing liquid with the heating means to vaporize a part of the absorbing liquid; and cooling the vaporized refrigerant generated in the regenerator. A condenser that liquefies and evaporates the liquefied refrigerant liquefied by the condenser under a low pressure; an absorber that absorbs the vaporized refrigerant evaporated by the evaporator into an absorbing liquid; An absorption refrigeration cycle having a solution pump for pumping to a regenerator; c) an indoor heat exchanger installed in the room for exchanging heat between indoor air and a heat medium, wherein when the liquefied refrigerant evaporates in the evaporator,
A heat medium circuit that guides the heat medium that has been deprived of the latent heat of evaporation and is cooled to the indoor heat exchanger, and guides the heat medium that has passed through the indoor heat exchanger to the evaporator again, provided in this heat medium circuit. An air conditioning unit having a heat medium pump for circulating a heat medium, and d) extracting non-condensable gas in the absorption refrigeration cycle.
And the non-condensation disposed outside the absorption refrigeration cycle.
A bleeding device for supplying to the gas tank, guiding the absorbing solution heated by the heating means to the evaporator, and heating the heat medium supplied from the evaporator to the indoor heat exchanger, thereby heating the room. In the absorption-type air conditioner capable of performing a heating operation, the non-condensable gas tank is provided so as to be covered with a heat insulating unit that hinders heat transmission, and the non-condensable gas tank is provided so as to insulate the surrounding air. Absorption type air conditioner characterized by the above-mentioned.