JPH10103808A - Air conditioner using absorption type refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an air conditioner of a low cost with small size and small power consumption without influence of instantaneous power interruption. SOLUTION: A normally open type heating solenoid valve 6 is provided at a heating absorption liquid channel L4, and opened without energizing at the time of heating. At the time of cooling, the value 6 is energized and forcibly closed while a temperature in a high temperature regenerator 1 is a predetermined temperature or lower, and when it becomes the predetermined temperature or higher, the valve 36 is stopped. A valve disc of the valve 6 is maintained closed by a pressure from the regenerator 1 due to a temperature rise in the regenerator 1, and the valve 6 is not opened. At the time of heating, even if an instantaneous power interruption occurs, the valve 6 is not closed. At the time of cooling, when the interruption occurs, if the temperature in the regenerator 1 is low, even if it is opened due to the power interruptions, since the pressure in the regenerator 1 is low, it can be again closed when the power is recovered. When the temperature is high, the valve is hot opened due to the power interruption, but the closure of the valve is maintained. Since the closing drive force of the valve 6 can be reduce, powder consumption is small with a small size.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner using an absorption refrigerating apparatus having an absorption cycle using an aqueous solution of lithium bromide or the like as an absorption liquid, and more particularly to a regeneration apparatus for separating refrigerant vapor from the absorption liquid. The present invention relates to an air conditioner in which a heating operation absorbing liquid flow path provided with an electromagnetic valve is provided between a heater and an evaporator, and switching between a cooling operation and a heating operation is performed by opening and closing control of the electromagnetic valve.

[0002]

2. Description of the Related Art In an air conditioner using an absorption refrigeration system,
In the regenerator, the low-concentration absorbing liquid is heated and boiled by a burner to separate the high-concentration absorbing liquid and the refrigerant vapor, and the refrigerant vapor is cooled by the condenser to become a refrigerant liquid. When the high-concentration absorbing liquid is sprayed on the surface of the absorbing coil in the absorber and the refrigerant liquid is sprayed on the evaporating coil in the evaporator, the refrigerant liquid vaporizes from the cold and hot water passing through the evaporating coil on the evaporating coil surface. The cold and hot water, which has been deprived of heat and evaporated and has been deprived of heat in the evaporating coil, circulates through a heat exchanger provided in a room to be cooled by the operation of the pump and becomes a cooling source in the cooling target. Conversely, the cold / hot water whose temperature has increased in the heat exchanger is cooled again by the evaporating coil.

On the other hand, on the surface of the absorption coil, the high-concentration absorption liquid absorbs refrigerant vapor and generates heat. The heat generated when the absorbing liquid absorbs the refrigerant vapor on the surface of the absorption coil moves to the cooling tower provided outside by the cooling water for exhaust heat passing by the operation of the pump in the absorption coil, and the cooling tower Released at The absorption cycle is configured so that the absorbent, which has absorbed the refrigerant in the absorber and reduced in concentration, returns to the regenerator by the absorbent pump.

Further, in the air conditioner which performs the heating operation, in the above configuration, a heating absorbent flow path provided with an electromagnetic valve is provided between the regenerator and the evaporator to perform the cooling operation and the heating operation. During cooling operation, the solenoid valve is controlled to be closed to perform cooling by the above absorption cycle, and during heating operation, the solenoid valve is controlled to be opened to absorb high temperature in the regenerator. The heating of the room is performed by supplying the liquid and the vapor into the evaporator and heating the cold / hot water circulating in the heat exchanger to be cooled. here,
If a normally open solenoid valve is used as the solenoid valve and energization is performed to keep the solenoid valve closed during cooling operation, a problem may occur in which the absorbing liquid crystallizes near the coil of the heating solenoid valve. Therefore, conventionally, a normally-closed electromagnetic valve that is controlled to be opened by energization is used, and is controlled to be closed by non-energization during cooling operation, and is controlled to be open by energization during heating operation. In the heating operation, the concentration of the absorbing solution is lower than in the cooling operation, and crystallization does not occur by energizing the coil.

[0005]

In an air conditioner using an absorption refrigeration system configured as described above, for example, if an instantaneous power failure occurs during a heating operation in an open state in which the solenoid valve is energized, the solenoid valve is connected to the solenoid valve. The energization is momentarily interrupted and the solenoid valve is closed. At this time, in the regenerator, the pressure of the high-temperature absorbing liquid and steam is increased by heating,
The valve body of the solenoid valve in the closed state is urged in the valve closing direction. Therefore, when the power is restored from the momentary power failure, the valve element must be driven against the high pressure in the regenerator to return the solenoid valve to the open state, so that a very large driving force is required. . Therefore, the valve-opening operation that was possible at the start of the heating operation when the inside of the regenerator is not at a high pressure becomes impossible even if the solenoid valve is energized again at the time of power recovery after the momentary power failure. In order to be able to cope with this, an electromagnetic valve having a very large driving force is required, which causes an increase in the size of the electromagnetic valve and an obstacle to cost reduction.

According to the present invention, there is provided an absorption type in which a heating absorbent flow path provided with a solenoid valve is provided between a regenerator and an evaporator in an absorption cycle, and a cooling operation and a heating operation are switched by opening and closing control of the solenoid valve. In an air conditioner using a refrigeration system,
It is an object of the present invention to provide an inexpensive device that does not cause crystallization even if an instantaneous power failure occurs without causing crystallization of the absorbing solution, and that is small in size, consumes little power.

[0007]

According to a first aspect of the present invention, there is provided a regenerator for heating an absorbing liquid containing a refrigerant to separate the refrigerant vapor from the absorbing liquid, and regenerating the refrigerant vapor separated by the regenerator. A condenser for cooling and condensing, an evaporator for evaporating the refrigerant condensed in the condenser under a low pressure, and an absorber for absorbing the refrigerant vapor evaporated in the evaporator into an absorbent supplied from the regenerator. Forming an absorption cycle from a pump that returns the absorbent from the absorber to the regenerator;
A heating operation absorbing liquid flow path including an electromagnetic valve is provided between the regenerator and the evaporator, and the electromagnetic valve is controlled by control means to switch between a heating operation and a cooling operation, and passes through the evaporator. In an air conditioner using an absorption refrigeration system that performs heating or cooling of an object to be air-conditioned by cooling / heating water, a normally-open electromagnetic valve that is kept open when not energized and is switched to a closed state when energized is used as the electromagnetic valve. With
The control unit includes a pressure determination unit that directly or indirectly determines the pressure in the regenerator, controls the solenoid valve to be de-energized to open during a heating operation, and sets the pressure during a cooling operation. Technical means is to energize the solenoid valve to close it when the judgment pressure of the judgment means is equal to or lower than a predetermined pressure, and to de-energize the solenoid valve when the judgment pressure is higher than the predetermined pressure.

According to a second aspect, in the first aspect, the pressure judging means is a temperature sensor for detecting a temperature in the regenerator, and when the temperature detected by the temperature sensor is equal to or higher than a predetermined temperature, the pressure is determined to be higher than the predetermined pressure. Judging as hot is a technical measure. According to a third aspect of the present invention, in the first or second aspect, during cooling operation, the solenoid valve is energized for a predetermined time from the start of operation, and the solenoid valve is de-energized after the predetermined time has elapsed. And

According to a fourth aspect, in the first, second and third aspects, when the pressure in the regenerator is higher than a predetermined pressure, the solenoid valve is urged in a direction in which the valve element is closed by the pressure in the regenerator. It is technical means that the heating means is disposed in the heating operation absorbing liquid flow path which is kept closed. Claim 5
Then, in any one of claims 1, 2, 3, and 4, the control means conducts electricity when the temperature of the regenerator becomes equal to or lower than the predetermined temperature at the end of the cooling operation, and closes the cooling device at a temperature lower than the predetermined temperature. When the temperature becomes equal to or lower than the valve dilution operation end temperature, the energization of the solenoid valve is stopped.

With the above configuration, in the air conditioner using the absorption refrigerating apparatus of the present invention, the absorbing liquid in the regenerator is heated by the heating means. During the cooling operation, the solenoid valve provided in the heating operation absorption liquid flow path is energized while the temperature in the regenerator is equal to or lower than a predetermined temperature and is closed, so that the solenoid valve between the regenerator and the evaporator is closed. The heating operation absorbent liquid flow path is not connected. Therefore, during the cooling operation, when the refrigerant vapor is separated from the absorbing liquid heated in the regenerator, it is supplied to the condenser through the refrigerant flow path. In the condenser, the refrigerant vapor is cooled into a refrigerant liquid. In the evaporator, the refrigerant liquid evaporates. At that time, the refrigerant liquid takes heat and serves as a cooling source. On the other hand, in the absorber, the high-density absorbent supplied from the regenerator absorbs the refrigerant vapor evaporated by the evaporator, and the low-concentration absorbent that has absorbed the refrigerant vapor returns to the regenerator by the pump.

When it is determined that the pressure in the regenerator is equal to or higher than the predetermined pressure during the cooling operation, the solenoid valve is controlled to be de-energized. However, since the absorbing liquid in the regenerator has already been heated and the temperature of the absorbing liquid and steam in the regenerator has become higher than the pressure in the evaporator with the temperature rise, the solenoid valve has been turned on. Even if stopped, the valve body of the solenoid valve does not open, and the solenoid valve is maintained in the closed state. As a result,
During the cooling operation, the absorbent and the refrigerant vapor separated by the regenerator are supplied to the absorber and the condenser, respectively, and the absorbent is not supplied from the regenerator to the evaporator. With the above absorption cycle, the evaporator cools the cold and hot water when the refrigerant liquid evaporates, and the cooled cold and hot water is sent from the evaporator to the cooling target and becomes a cooling source in the cooling operation.

During the heating operation, the solenoid valve of the heating absorbent flow path is de-energized and is opened, so that the absorbent and steam heated by the regenerator pass through the heating absorbent flow path. Is supplied to the evaporator. In the evaporator, the cold and hot water is heated by the high-temperature absorbing liquid and the steam and supplied to the heat exchanger to be heated, and serves as a heat source in the heating operation.

According to the present invention, since the solenoid valve is not energized during the heating operation, the absorption liquid flow path for the heating operation can be secured even if an instantaneous power failure occurs, and the absorption liquid and vapor heated from the regenerator to the evaporator can be secured. Can be continuously supplied. Therefore, a stable heating operation can be secured. During cooling operation, the solenoid valve is energized only while the temperature inside the regenerator is low, and after the pressure inside the regenerator rises, the solenoid valve is kept closed using the pressure inside the regenerator. I do. Therefore, there is no problem that crystallization of the absorbing solution occurs during the heating operation and the cooling operation, and a large driving force is not required for the solenoid valve, so that a small-sized, low-cost solenoid valve with low power consumption can be used.

Further, even if an instantaneous power failure occurs during energization at the start of the cooling operation and the solenoid valve is opened, the temperature in the regenerator is low and the pressure is low. With this driving force, the solenoid valve can be reliably closed again. Also, if the temperature inside the regenerator rises during cooling operation and the solenoid valve is de-energized and is kept closed by the pressure inside the regenerator, the solenoid valve may open even if a momentary power failure occurs. Therefore, stable cooling operation can be performed with the solenoid valve kept closed. Also,
As in the present invention, the solenoid valve is temporarily energized at the start of the cooling operation or the like, and the solenoid valve is turned off at the time of the heating operation and the steady operation of the cooling operation (when the temperature in the regenerator is higher than a predetermined temperature). When the current is controlled to be energized, the energization time of the solenoid valve can be significantly reduced. As a result, power consumption can be reduced,
Operating costs can be reduced.

[0015]

FIG. 1 shows an air conditioner according to the present invention. The air conditioner is an absorption refrigeration system 1 as an outdoor unit.
00 and the indoor unit RU, and the absorption refrigeration system 100
Is the refrigerator main body 101 and the cooling tower (cooling tower) C
And T. The air conditioner is controlled by the control device 10
2 is controlled.

The refrigerating machine main body 101 forms an absorption cycle of a refrigerant and an aqueous solution of lithium bromide as an absorbing liquid, and includes a high-temperature regenerator 1 provided with a gas burner B as a heating source below, and a high-temperature regenerator 1 A low-temperature regenerator 2 disposed so as to cover the outside of the low-temperature regenerator 1; and an absorber 3 and an evaporator 4 double disposed toward the outer periphery of the low-temperature regenerator 2. And a condenser 5 disposed on the outer periphery of the low-temperature regenerator 2 and above the absorber 3 through several passages.

A high-temperature regenerator 1 is provided above a heating tank 11 heated by a gas burner B, above a medium-concentration absorbent separating cylinder 1.
2, a vertical cylindrical airtight refrigerant recovery tank 10 is provided so as to cover the outer periphery of the medium-concentration absorbing liquid separation tube 12 from above. Thus, in the high-temperature regenerator 1, the low-concentration absorbing liquid contained in the heating tank 11 is heated by the gas burner B, and water as a refrigerant in the low-concentration absorbing liquid is evaporated to form refrigerant vapor (water vapor).
As a result, the separated medium vapor is separated outside the medium-concentration absorption liquid separation cylinder 12, the medium-concentration absorption liquid concentrated by evaporation of the refrigerant vapor is left in the storage section 121 inside the medium-concentration absorption liquid separation cylinder 12, and the separated refrigerant vapor is collected as refrigerant. Collected in tank 10.

The low-temperature regenerator 2 is a vertical cylindrical low-temperature regenerator case 2 eccentrically installed on the outer periphery of the refrigerant recovery tank 10.
0, a refrigerant vapor outlet 21 is provided around the ceiling of the low-temperature regenerator case 20. Low temperature regenerator case 20
The top of the ceiling is connected to the storage part 121 of the middle-concentration absorbent separation cylinder 12 via the heat exchanger H by the middle-concentration absorbent flow path L1.

In the medium-concentration absorbent flow path L1, a storage section 12 is provided.
An orifice (not shown) for limiting the flow rate of the medium concentration absorbing liquid flowing from 1 to the low temperature regenerator 2 is provided.
The medium-concentration absorbent is supplied into the low-temperature regenerator case 20 by a pressure difference from the medium-concentration absorbent separation cylinder 12. Thus, the low-temperature regenerator 2 reheats the medium-concentration absorbing liquid supplied into the low-temperature regenerator case 20 using the outer wall of the refrigerant recovery tank 10 as a heat source, and the medium-concentration absorbing liquid is
The high-concentration absorbent is separated into refrigerant vapor and high-concentration absorbent in a gas-liquid separation unit 22 above the high-concentration absorbent.
Is stored at

A low-temperature regenerator case 20 has a vertical cylindrical air-tight evaporating / absorbing case 30 disposed concentrically at the lower part thereof, and a condenser case 50 concentrically disposed at an upper part thereof. The low-temperature regenerator case 20 and the evaporating / absorbing case 30 are integrally welded to each other at the bottom plate portions 13 to form the refrigerator main body 101. The low-temperature regenerator case 20 communicates with the inside of the condenser case 50 via the refrigerant vapor outlet 21 and the gap 5A.

The absorber 3 is provided with an absorption coil 31 which is wound in a vertical cylindrical shape inside an evaporating / absorbing case 30 and through which cooling water for exhaust heat flows, and above the absorption coil 31. A high-concentration absorbent spraying device 32 for dispersing the high-concentration absorbent to the absorption coil 31 is provided. The high-concentration absorbent spraying device 32 supplies the high-concentration absorbent discharged from the opening of the high-concentration absorbent flow path L2 connected to the high-concentration absorbent reception part 23 of the low-temperature regenerator 2 via the heat exchanger H. The cooling tower CT is dispersed in the absorption coil 31 during the cooling operation.
The cooling water for exhaust heat cooled in the above is circulated.

In the absorber 3, the high-concentration absorbent flows in from the high-concentration absorbent flow path L2 due to the pressure difference, and the high-concentration absorbent flowing in is absorbed by the high-concentration absorbent dispersion device 32 into the absorption coil 31.
At the upper end of the coil 31 and adheres to the surface of the absorption coil 31 to form a thin film, flows downward by the action of gravity, absorbs water vapor, and becomes a low concentration absorbent. When absorbing the water vapor, heat is generated on the surface of the absorption coil 31, but is cooled by cooling water for exhaust heat circulating through the absorption coil 31. Note that the water vapor absorbed by the high-concentration absorbent is generated as refrigerant vapor in an evaporator 4 described later. The bottom 33 of the absorber 3
The low-concentration absorption liquid in the absorber 3 is heated by the operation of the absorption liquid pump P1, which is connected to the bottom of the heating tank 11 by a low-concentration absorption liquid flow path L3 equipped with the heat exchanger H and the absorption liquid pump P1. It is supplied into the tank 11.

The evaporator 4 is a vertical cylindrical communication port 40a provided on the outer periphery of the absorption coil 31 in the evaporation / absorption case 30.
A vertical cylindrical evaporating coil 41 through which cold and hot water for cooling and heating flows is disposed on the outer periphery of the partition wall 40 provided with a refrigerant liquid dispersing tool 42 above it. The evaporator 4
Is connected to the storage part 121 of the medium-concentration absorbent separation cylinder 12 in the high-temperature regenerator 1 by the heating absorbent flow path L4 having the heating electromagnetic valve 6.

In the evaporator 4, when the refrigerant liquid (water) is dropped on the evaporation coil 41 from the refrigerant liquid sprayer 42 during the cooling operation, the dropped refrigerant liquid is subjected to the surface tension of the evaporation coil 41.
Of the vaporizing coil 41 in the evaporating / absorbing case 30 at a low pressure (for example, 6.5 mmHg) while evaporating by evaporating and evaporating. The air-conditioning cold / hot water flowing in the coil 41 is cooled.

The condenser 5 is provided with a cooling coil 51 in which cooling water for exhaust heat cooled by the cooling tower CT circulates inside a condenser case 50. Condenser case 50
The bottom portion 14 of the refrigerant recovery tank 10 is provided by a refrigerant flow path L5 provided with an orifice (not shown) for restricting the flow rate of the refrigerant from the refrigerant recovery tank 10 to the condenser case 50.
And the refrigerant vapor outlet 21 and the gap 5A
And the refrigerant is supplied by a pressure difference (about 70 mmHg in the condenser case).

In the condenser 5, the refrigerant vapor supplied into the condenser case 50 is cooled by the cooling coil 51 and liquefied. The lower part of the condenser 5 and the refrigerant liquid disperser 42 disposed above the evaporator coil 41 of the evaporator 4 communicate with each other through a refrigerant liquid supply path L6. The liquefied refrigerant liquid passes through the refrigerant cooler 52 provided in the refrigerant liquid supply passage L6, and is supplied to the refrigerant liquid sprayer 4.
2 is supplied.

In the absorption cycle having the above configuration, during the cooling operation, the absorption liquid is supplied to the high-temperature regenerator 1 → the medium-concentration absorption liquid channel L1 → the low-temperature regenerator 2 → the high-concentration absorption liquid channel L2 → the absorber 3 → It circulates in the order of the absorbent pump P 1 → the low concentration absorbent flow path L 3 → the high temperature regenerator 1. The refrigerant is a high-temperature regenerator 1
(Refrigerant vapor) → refrigerant flow path L5 (refrigerant vapor) or low-temperature regenerator (refrigerant vapor) → condenser 5 (refrigerant liquid) → refrigerant supply path L6
(Refrigerant liquid) → refrigerant cooler 52 (refrigerant liquid) → refrigerant liquid sprayer 42 (refrigerant liquid) → evaporator 4 (refrigerant vapor) → absorber 3 (absorbent liquid) → absorbent pump P1 → low concentration absorbent flow It circulates in the order of path L3 → high temperature regenerator 1.

The absorption coil 31 of the absorber 3, which exchanges heat with the absorption liquid, and the cooling coil 51 of the condenser 5 are connected to form a continuous coil. The cooling water circulation path is formed by being connected to the CT. In this cooling water circuit, the absorption coil 3
A cooling water pump P2 for sending cooling water into the continuous coil is provided in a cooling water flow path 34 between the inlet of the cooling tower CT and the cooling tower CT.
The cooling water which passes through the continuous coil by the operation of the cooling water pump P2 absorbs the heat of absorption by the absorption coil 31 and the heat of condensation by the cooling coil 51, and becomes relatively high in temperature. Supplied to CT.

With the above configuration, in the cooling water circulation path, the cooling water in the cooling tower CT is operated by the operation of the cooling water pump P2.
It circulates in the order of cooling tower CT → cooling water pump P2 → absorption coil 31 → cooling coil 51 → cooling tower CT. In the cooling tower CT, self-cooling is performed in which the falling cooling water is partially evaporated into the atmosphere to cool the remaining cooling water.
An exhaust heat cycle is formed in which the heat is released into the atmosphere to lower the temperature. Note that the air from the blower S promotes the evaporation of water.

The evaporator coil 41 of the evaporator 4 includes an indoor unit R
The air-conditioning heat exchanger 44 provided in U is connected by a cold / hot water flow path 47, and the cold / hot water pump P3
Is provided. With the above configuration, the evaporating coil 41
The low temperature hot and cold water circulates in the order of the evaporating coil 41 → the cold and hot water channel 47 → the air conditioning heat exchanger 44 → the cold and hot water channel 47 → the cold and hot water pump P3 → the evaporating coil 41. Indoor unit RU
Is provided with an air-conditioning heat exchanger 44, and a blower 46 that allows room air to pass through the heat exchanger 44 and blows out the room again.

Next, the heating absorbent flow path L4 and the heating solenoid valve 6 provided between the high temperature regenerator 1 and the evaporator 4 will be described. The heating absorbent flow path L4 and the heating solenoid valve 6 are replaced with the above-described absorption cycle during the heating operation.
The heating solenoid valve 6 is provided to connect the high-temperature regenerator 1 and the evaporator 4, and during a cooling operation, the heating electromagnetic valve 6 is closed to form an absorption cycle.

In this embodiment, as shown in FIG. 4, a normally-open type electromagnetic valve which opens when not energized and closes when energized is used as the heating electromagnetic valve 6 as shown in FIG.
During the cooling operation, the heating electromagnetic valve 6 is controlled to close, and during the heating operation, the heating electromagnetic valve 6 is controlled to open.

The control of the heating solenoid valve 6 during the cooling operation by the control device 102 will be described below with reference to FIG. When the user gives an instruction to start the cooling operation by operating a controller (not shown) (YE in step S1).
S), the energization of the heating solenoid valve 6 is started (step S).
2) As a result, the heating electromagnetic valve 6 is switched from the open state to the closed state, and the absorbent pump P1 is driven, the gas burner B is ignited, and the operation of the absorption cycle is started.

Thereafter, the temperature in the heating tank 11 of the high-temperature regenerator 1 rises due to the heating of the gas burner B, and when the refrigerant vapor is separated from the medium-concentration absorbent, the pressure in the high-temperature regenerator 1 gradually increases. As long as the detected temperature T of the temperature sensor TH as the pressure determining means provided in the high temperature regenerator 1 does not reach the predetermined temperature T1 (for example, 130 ° C.) (Step S
3), the energization of the heating solenoid valve 6 is continued,
The heating electromagnetic valve 6 is forcibly maintained in the closed state.

When the detected temperature T of the temperature sensor TH exceeds the predetermined temperature T1 (YES in step S3), the energization of the heating electromagnetic valve 6 performed so far is stopped (step S4). This predetermined temperature T1 is the high temperature regenerator 1
Is sufficiently large with respect to the pressure in the evaporator 4,
The valve element of the heating electromagnetic valve 6, which was in the closed state by energization until then, has a pressure that can reliably maintain the closed state by the pressure from the high-temperature regenerator 1 side of the heating absorption liquid flow path L4. Temperature.

Therefore, even if the energization to the heating solenoid valve 6 is stopped after the temperature reaches the predetermined temperature T1 or more, the valve body is continuously closed, and the high temperature regenerator 1 and the evaporator 4 are heated. There is no communication with the use absorption liquid flow path L4. After this,
While the cooling operation is continued and the heating by the gas burner B is continued, the heating electromagnetic valve 6 maintains the closed state.

When the end of the cooling operation is instructed by a user's operation (YES in step S5), the combustion of the gas burner B is stopped, and the absorbent pump P1 is in the dilution operation state while continuing to operate, and the high temperature is maintained. The temperature inside the regenerator 1 gradually decreases. When the temperature in the high-temperature regenerator 1 reaches a predetermined temperature T
While it is higher than 1 (NO in step S6), the heating electromagnetic valve 6 reliably maintains the closed state due to the pressure in the high-temperature regenerator 1.

When the temperature in the high-temperature regenerator 1 becomes lower than the predetermined temperature T1 (YES in step S6), the closed state due to the pressure cannot be maintained, and the heating electromagnetic valve 6 is energized again (step S7). , Heating solenoid valve 6
Is forcibly closed. Thereafter, the absorption liquid pump P1 operates to perform the dilution operation, during which time the temperature inside the high-temperature regenerator 1 gradually decreases.

When the heating of the high-temperature regenerator 1 is stopped, the temperature T detected by the temperature sensor decreases to the valve closing dilution end temperature T2 (for example, 1).
10 ° C.) (YE in step S8).
S), the energization of the heating solenoid valve 6 is stopped (step S).
9). As a result, the heating solenoid valve 6 is opened.
The dilution operation is performed in this state.

Thereafter, the detected temperature T becomes equal to the valve opening dilution end temperature T.
3 (for example, 100 ° C.) (step S10).
Is YES), the absorption pump P1 is stopped (step S11), and the cooling operation is ended. FIG. 3 shows a relationship between a change in the temperature inside the high-temperature regenerator 1 during the cooling operation and the control of the heating electromagnetic valve 6. As is clear from the figure, the energization time of the heating solenoid valve 6 is
It turns out to be very short.

On the other hand, in the heating operation, the heating solenoid valve 6 is not energized, and the heating solution solenoid valve 6 is in the open state. The medium-concentration absorbing liquid having a temperature flows into the evaporator 4 from the bottom 43 of the evaporator 4 to heat the cold and hot water in the evaporator coil 41, and the hot and cold water in the heated evaporator coil 41 is supplied to the cold and hot water pump P3. Is supplied from the cold / hot water flow path 47 to the air-conditioning heat exchanger 44 and becomes a heat source for heating. The medium-concentration absorbing liquid in the evaporator 4 flows from the communication port 40a of the partition plate 40 to the absorber 3
Side, and is returned to the heating tank 11 by the absorbent pump P1 via the low concentration absorbent flow path L3.

As described above, in the present embodiment, during the cooling operation, the heating solenoid valve 6 provided in the heating absorbent flow path L4 causes the temperature in the high-temperature regenerator 1 at the start of the cooling operation to reach the predetermined temperature T1. During the following period, the heater is closed by being energized, and when the temperature in the high-temperature regenerator 1 becomes equal to or higher than the predetermined temperature T1, the heating solenoid valve 6 is controlled to be de-energized. Has already been heated, and the pressure of the absorbing liquid and steam in the high-temperature regenerator 1 is higher than the pressure in the evaporator 4 with the rise in temperature, so that the energization of the heating electromagnetic valve 6 is stopped. However, the valve body of the heating solenoid valve 6 does not open,
The heating electromagnetic valve 6 is kept closed by the pressure.

Therefore, in this embodiment, during the cooling operation,
The heating solenoid valve 6 is energized only while the temperature in the high-temperature regenerator 1 is low. After the temperature in the high-temperature regenerator 1 increases and the pressure increases, the pressure in the high-temperature regenerator 1 is used. The heating electromagnetic valve 6 is maintained in a closed state. Therefore, there is no problem that the crystallization of the absorbing solution occurs through the heating operation and the cooling operation,
In addition, a large driving force is not required for the heating electromagnetic valve 6, and a small, inexpensive heating electromagnetic valve 6 with small power consumption can be used.

Further, even if a momentary power failure occurs during energization at the start of the cooling operation and the heating solenoid valve 6 is opened,
Since the temperature inside the high-temperature regenerator 1 is low and the pressure is low, when the power is restored, the heating electromagnetic valve 6 can be reliably closed again by the driving force generated by energization. Also,
When the temperature in the high-temperature regenerator 1 rises during the cooling operation and the heating solenoid valve 6 is de-energized and is kept closed by the pressure in the high-temperature regenerator 1, even if an instantaneous power failure occurs, Since the heating electromagnetic valve 6 does not open, a stable cooling operation can be performed while the heating electromagnetic valve 6 is kept closed.

In the heating operation, the heating solenoid valve 6 is not energized, so that even if a momentary power failure occurs, the heating absorption liquid flow path L4 can be secured, and the heating from the high temperature regenerator 1 to the evaporator 4 is performed. Absorbing liquid and vapor can be continuously supplied. Therefore, a stable heating operation can be secured.

Also, as in the present embodiment, a normally-open solenoid valve is used as the heating solenoid valve 6, and the heating solenoid valve 6 is temporarily energized at the start of the cooling operation or the like, so that the heating solenoid valve 6 is turned on during the heating operation and the cooling operation. When the heating solenoid valve 6 is controlled to be de-energized during steady operation (when the temperature in the regenerator is higher than the predetermined temperature T1), the energization time of the heating solenoid valve 6 can be significantly reduced. As a result, power consumption and power consumption can be reduced, and operating costs can be reduced. In particular, in this embodiment, since the pressure in the regenerator is indirectly determined using the temperature sensor TH for controlling the dilution operation, another sensor for determining the pressure is not required. And an inexpensive device.

In the above embodiment, the cooling tower CT of the cooling water flow path 34 is of the open type in which a part of the cooling water is evaporated to self-cool the cooling water. However, a water cooling device that forms a closed circuit that is not open to the atmosphere may be used.

In the above embodiment, the indoor unit RU is provided with only the air conditioning heat exchanger 44. However, in order to perform the dehumidifying operation without lowering the indoor temperature, the air cooled once by the air conditioning heat exchanger 44 is used. Air-conditioning heat exchanger 4
4 may be juxtaposed.

In the above embodiment, the double-effect absorption refrigeration apparatus has been described. However, a single-effect absorption refrigeration apparatus may be used.
Oil burners and electric heaters may be used. In the above embodiment, the pressure is indirectly determined by the temperature sensor as the pressure determining means. However, a pressure sensor may be provided to directly detect the pressure in the regenerator. The timer may be energized for a predetermined time (for example, three minutes) from the start of operation, and may be de-energized after the elapse of the predetermined time. In this case, the predetermined time may be determined based on the case of a cold start that takes the longest time to reach the predetermined pressure (the predetermined temperature T1). In this case, at the time of the hot start, a predetermined pressure (predetermined temperature T1) is reached in a short time (0 to 2 minutes), and power is supplied for a while (maximum 3 minutes) after reaching the predetermined pressure. There is no problem because the current is sufficiently short as compared with the energizing time (about two hours in a row) under which the conditions for the precipitation occur.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an air conditioner showing an embodiment of the present invention.

FIG. 2 is a flowchart for explaining solenoid valve control of a control device according to an embodiment of the present invention.

FIG. 3 is a time chart showing a relationship between a change in temperature in a high-temperature regenerator and a control of a heating electromagnetic valve during a cooling operation in the embodiment of the present invention.

FIG. 4 is a sectional view showing a heating solenoid valve according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High temperature regenerator (regenerator) 2 Low temperature regenerator (regenerator) 3 Absorber 4 Evaporator 5 Condenser 6 Heating solenoid valve (solenoid valve) 100 Absorption refrigeration apparatus 102 Controller (control means) P1 Absorbing liquid pump (Pump) L4 Heating absorbent flow path (heating absorbent flow path) RU Indoor unit (air conditioning target) TH Temperature sensor

Claims (5)

[Claims] 1. A regenerator that heats an absorbent containing a refrigerant to separate refrigerant vapor from the absorbent, a condenser that cools and condenses the refrigerant vapor separated by the regenerator, An evaporator that evaporates the condensed refrigerant under a low pressure; an absorber that absorbs the refrigerant vapor evaporated by the evaporator into an absorbent supplied from the regenerator; and returns the absorbent from the absorber to the regenerator. A pump and an absorption cycle are formed, and a heating operation absorbing liquid flow path including an electromagnetic valve is provided between the regenerator and the evaporator, and the electromagnetic valve is controlled by control means to perform heating operation and cooling. In an air conditioner using an absorption refrigeration system that switches between operation and operation and heats or cools an object to be air-conditioned by cold and hot water passing through the evaporator, the electromagnetic valve is kept open when not energized and closed when energized. The control means includes a pressure determination means for directly or indirectly determining the pressure in the regenerator, and controls the solenoid valve to be non-energized during a heating operation. When the cooling operation is performed, the solenoid valve is energized to close the solenoid valve when the pressure determined by the pressure determination means is equal to or lower than a predetermined pressure, and is deenergized when the pressure is higher than the predetermined pressure. An air conditioner using an absorption refrigeration system, characterized in that the air conditioner is controlled in a controlled manner. 2. The pressure judging means is a temperature sensor for detecting a temperature inside the regenerator, and judges that the temperature is equal to or higher than the predetermined pressure when the temperature detected by the temperature sensor is equal to or higher than a predetermined temperature. An air conditioner using the absorption refrigeration device according to claim 1. 3. The cooling device according to claim 1, wherein the solenoid valve is energized for a predetermined time from the start of the cooling operation, and the solenoid valve is de-energized after the predetermined time has elapsed. Air conditioner using an absorption refrigeration system. 4. When the pressure in the regenerator is higher than a predetermined pressure, the solenoid valve is urged in a direction in which a valve body is closed by the pressure in the regenerator and is maintained in a closed state. The air conditioner using the absorption refrigeration device according to any one of claims 1, 2 and 3, wherein the air conditioner is arranged in the absorption liquid flow path. 5. The control means according to claim 1, further comprising:
The power supply to the solenoid valve is stopped when the temperature of the regenerator becomes equal to or lower than the predetermined temperature, and the power supply to the solenoid valve is stopped when the temperature becomes equal to or lower than the valve closing dilution operation end temperature lower than the predetermined temperature. An air conditioner using the absorption refrigeration device according to any one of 3 and 4.