JPH0633897B2 - Air conditioner - Google Patents

Description

TECHNICAL FIELD The present invention relates to an air conditioner for cooling and dehumidifying in a manufacturing process or the like.

[Conventional technology]

A conventional air conditioner of this type will be described with reference to FIG. In FIG. 4, the high-temperature high-pressure gas refrigerant discharged from the compressor (1) flows during the cooling operation as indicated by the solid arrow. That is, the first blower (3) blows air through the three-way valve (2).
To the condenser (4), where it is condensed and liquefied. After that, the pressure is reduced by the expansion device (5) through the check valve (17), and the second blower is blown.
After being evaporated by the evaporator (7) blown by (6), it returns to the compressor (1). Next, during dehumidification operation, the high-temperature high-pressure gas refrigerant discharged from the compressor (1) is
After going through (2), it reaches the second condenser (8) which is provided on the leeward side of the evaporator (7) and is blown by the second blower (6), where it is condensed and liquefied. Then, the pressure is reduced by the expansion device (5), evaporated by the evaporator (7), and returned to the compressor (1). On the other hand, the air flowing into the evaporator (7) is cooled and dehumidified by the evaporator (7) during the cooling operation and is blown out, and during the dehumidification operation, after being cooled and dehumidified by the evaporator (7), It is heated in the second condenser (8) and blown out with dry air. The first condenser (4) is usually installed outdoors.

[Problems to be solved by the invention]

The conventional air conditioner having the cooling and dehumidifying functions has the following problems because it is configured as described above.

First, when only dehumidifying operation is performed as in the winter, the three-way valve
Although (2) is switched to the state of the broken line, the refrigerant leaking from the three-way valve (2) is exposed to low temperature outside air.
(4) It accumulates inside the liquid refrigerant. Therefore, the refrigerant in the refrigerant circuit for the dehumidifying operation gradually decreases over a long period of time,
You will not be able to drive normally. In addition, the temperature of blown air during dehumidification operation rises significantly above the temperature of intake air (compressor).
Since the enthalpy of air increases by the input of (1)), the room temperature fluctuation during cooling operation and dehumidifying operation becomes large. Therefore, when trying to control the temperature and humidity to a predetermined level, the three-way valve (2) is frequently switched, which causes a failure of the three-way valve (2).

The present invention has been made to solve the above problems, and an object thereof is to obtain an air conditioner capable of preventing frequent switching of a refrigerant circuit and continuing stable operation. .

[Means for solving problems]

The air conditioner according to the present invention is provided with a first circuit for circulating a refrigerant from an outdoor first condenser to a throttle device, and a second condenser provided indoors from a first condenser. A switching valve having a second circuit for circulating the refrigerant to the expansion device via the air conditioner, and a first blower for blowing air to the first condenser, and detects the temperature of air flowing into the evaporator. A first temperature controller set to a first predetermined temperature;
Second temperature set to a second predetermined temperature lower than the predetermined temperature of
Temperature controller, a humidity controller for detecting indoor humidity, and the temperature of the U vent of the first condenser (condensation temperature) are detected, and the air volume of the first blower is controlled according to the condensation temperature. The air flow rate control device controls the switching of the switching valve and the first control.
By controlling the operation of the blower and the compressor, the above object is achieved.

[Action]

The air conditioner according to the present invention switches the switching valve from the first circuit to the second circuit when the indoor air temperature drops to the first predetermined temperature when the indoor air humidity is high, and further, the second circuit When the temperature drops to a predetermined temperature, the first blower controlled by the air volume control device is stopped, and after the temperature drops to a predetermined humidity, the compressor is stopped. The compressor is stopped when the temperature drops to a predetermined temperature.

Example of Invention

An embodiment of the present invention will be described below with reference to the drawings.
The description of the same or corresponding parts as in FIG. 4 will be omitted. FIG. 1 is a refrigerant circuit diagram showing an embodiment of the present invention,
FIG. 2 is a characteristic diagram showing the relationship between the condensing temperature, the number of revolutions of the blower, and noise, and FIG. 3 is an electric circuit diagram showing one embodiment of the present invention.

In FIG. 1, (9) is a switching valve, and in this embodiment, it is composed of solenoid valves (9a) (9b), and one end of the solenoid valves (9a) (9b) is connected to the first condenser (4). The other end of the solenoid valve (9a) is the second condenser (8)
In addition, the other end of the solenoid valve (9b) communicates with the liquid reservoir (10) respectively, and only the second circuit (9a ₁ ) in which the refrigerant flows only in the solenoid valve (9a) and the solenoid valve (9b) are in contact with the refrigerant. It forms the first circuit (9b ₁ ) that circulates. (11) is a non-return valve, which is a sump (10) from the solenoid valve (9b).
This is to prevent the refrigerant supplied to the backflow of the refrigerant to the second condenser (8). (12) is an accumulator. Reference numeral (13) is a humidity controller for detecting the humidity of the air sucked into the evaporator (7), and has a humidity sensitive portion (13a). (14) and (15) are first and second temperature controllers for detecting the intake air temperature of the evaporator (7), which have temperature sensing parts (14a) and (15a), respectively. The temperature controller (14) is set to a first predetermined temperature, and the second temperature controller 15 is set to a second predetermined temperature lower than the first predetermined temperature. (16) is an air volume control device, which has a temperature sensing part (16a) for detecting the temperature (condensation temperature) of the U-bend part (4a) of the first condenser (4), and the first blower according to the condensation temperature. It controls the number of revolutions, that is, the air volume, and has the characteristics shown in FIG.

Next, the electric circuit will be described. In Figure 3, (MC)
Are electric motors for the compressor (1), and (MF ₁ ) and (MF ₂ ) are electric motors for the first and second blowers (3) and (6), respectively. (52C) is an electromagnetic contactor for the electric motor (MC) for the compressor (1), and (52C ₁ ) and (52C ₂ ) are its a contacts. (52F ₁ ) and (52F ₂ ) are electromagnetic contactors of the electric motors (MF ₁ ) and (MF ₂ ) for the first and second blowers (3) and (6), respectively.
(52F ₁₁ ) (52F ₂₁ ) is a of the magnetic contactor (52F ₁ ) (52F ₂ ).
It is a contact point. (SVa) is the coil of the solenoid valve (9a), and (SVb) is the coil of the solenoid valve (9b). (X) is a relay, (X ₁ ) is its a contact, and (X ₂ ) is its b contact. (23HS) is a humidity controller (13)
The contact forms a parallel circuit with the a contact (X ₁ ) of the relay (X), and the parallel circuit is in series with the electromagnetic contactor (52C). (23RH) is the contact of the first temperature controller (14) and is the relay
(X) and the coil (SVb) of the second solenoid valve (9b) are connected in series with the parallel circuit. Reference numeral (23RL) is a contact of the second temperature controller (15), which constitutes a series circuit formed by the a contact (52C ₂ ) of the electromagnetic contactor (52C) and the electromagnetic contactor (52F ₁ ).
(SW) is a driving switch and (SS) is a safety switch group.

Next, the operation will be described. First, when the operation switch (SW) is turned on, the electromagnetic contactor (52F ₂ ) is excited, and its a contact (5
2F ₂₁ ) is closed and the electric motor (MF ₂ ) for the second blower (6) is operated. When the intake air of the evaporator (1) has a predetermined humidity or higher and a first predetermined temperature or higher, the humidity controller (1
Since the contact (23HS) of 3) and the contacts (23RH) (23RL) of the first and second temperature controllers (14) and (15) are closed, an electromagnetic contactor
(52C) is excited, and its a contact (52C ₁ ) (52C ₂ ) is closed,
The electric motor (MC) for the compressor (1) is operated. The coil (SVb) of the second solenoid valve (9b) is excited to open the circuit.
Coil (SVa) of the solenoid valve (9a) of the by the excitation of the relay (X), is in the demagnetized state because the contact b (X ₂₎ is open, the solenoid valve (9a) are closed. In addition, an electromagnetic contactor (5
Since 2F ₁ ) is excited, its a contact (52F ₁₁ ) is closed, and the electric motor (MF ₁ ) for the first blower (3) is operated. First
The blower (3) is controlled by the air volume control device (16). As a result, the cooling operation in which the refrigerant circulates as indicated by the solid arrow in FIG. 1 is performed. That is, the high-temperature and high-pressure gas refrigerant discharged from the compressor (1) is condensed in the first condenser (4) and then flows out of the liquid reservoir (10) via the second electromagnetic valve (9b). The liquid refrigerant is decompressed by the expansion device (5), and the evaporator (7)
After being vaporized at, it is separated into gas and liquid by the accumulator (12),
Return to compressor (1). On the other hand, the indoor air is cooled and dehumidified by the evaporator (7), passes through the second condenser (8), and is blown out into the room again, but the second condenser (8) contains the refrigerant. It is not heated because it is not distributed. Therefore, the indoor air temperature gradually decreases. When the inflow air temperature of the evaporator (7) falls below the first predetermined temperature while continuing the operation in this way, the first temperature controller (14) detects this,
The contact (23RH) opens. Therefore, the coil (SVb) of the solenoid valve (9b) is demagnetized, the solenoid valve (9b) is closed, and conversely,
The demagnetization of the relay (X), the b-contact (X ₂₎ is closed, are the excitation coil of the solenoid valve (9a) (SVa) is a solenoid valve (9a) is open. Therefore, the refrigerant flows as shown by the broken line in FIG. 1 and is condensed in both the first and second condensers (4) and (8). As a result, the air cooled and dehumidified by the evaporator (7) is slightly heated by the second condenser (8) and blown out. Assuming that this heating amount is Q ₁ , the heat radiation amount in the first condenser (4) is Q ₂ , the input of the compressor (1) is Q ₃ , and the heat absorption amount in the evaporator (7) is Q ₄ , _{1 = Q 3 + Q 4 -Q} 2 holds. Therefore, when the air volume of the first blower (3) is constant, Q ₁ > Q ₄ due to the heat radiation amount Q _{2 in} the first condenser (4).
In some cases, Q ₁ <Q ₄ in some cases. When Q ₁ > Q ₄ , the indoor air temperature gradually rises, while when Q ₁ <Q ₄ , the indoor air temperature gradually falls. On the other hand, in the present invention, when Q ₁ > Q ₄ and the room air temperature rises, the condensing temperature of the first condenser (4) rises accordingly. That is, the temperature of the U vent section (4a) of the condenser (4) rises. The temperature of the U-bend part (4a) is detected and the air flow controller (16) is used to
The air volume of the blower (3) increases. Since the amount Q ₂ of heat radiation in the first condenser (4) increases due to the increase in the air volume, the operation is performed so that Q ₁ becomes substantially equal to Q ₄ . On the contrary, when Q ₁ <Q ₄ and the indoor air drops, the condensing temperature of the condenser (4) drops accordingly. That is, the temperature of the U vent part (4a) of the condenser (4) is lowered. This reduces the air volume of the first blower (3). Since the amount of heat radiation Q _{2 in} the first condenser (4) decreases due to the decrease in the air flow, the operation is performed so that Q ₁ becomes substantially equal to Q ₄ .

In addition, even if the air volume of the first blower (3) is reduced like in the winter season, if the heat radiation amount in the first condenser (4) is large and the room temperature is decreasing, the temperature is below the second predetermined temperature. Then, the contact (23RL) of the second temperature controller (15) is opened, and the first blower (3) is stopped. When the humidity of the inflowing air reaches a predetermined value or less while continuing the operation in this way, the humidity controller (13) cools it and the contact (23HS) is opened. On the other hand, the relay (X) is in the demagnetized state, and its a contact (X ₁ ) is open. Therefore, the electromagnetic contactor (52C) is demagnetized and its a
The contacts (52C ₁ ) (52C ₂ ) are opened, the motor (MC) for the compressor (1),
The electric motor (MF ₁ ) for the first blower (3) is stopped. Next, the case where the operation is started from the state where the room temperature is lower than the set value of the second temperature controller (15), that is, the second predetermined temperature will be described.
Since the contact (23RL) of the second temperature controller (15) is open, the electromagnetic contactor (52F ₁ ) is demagnetized and its a contact (52F ₁₁ )
Is open circuit. Therefore, the electric motor (MF ₁ ) for the first blower (3) is stopped, and the heat radiation amount Q in the first condenser (4) is
₂ is greatly reduced, and conversely the heating amount Q ₁ in the second condenser (8)
Will increase. Therefore, the air cooled and dehumidified in the evaporator (7) is sufficiently heated in the second condenser (8) and blown out as dry air. In this way, the so-called dehumidifying / drying operation is performed, and when the inflowing air of the evaporator (7) reaches or exceeds the second predetermined temperature, the second temperature controller (15) operates and its contact point.
(23RL) is closed. Therefore, the electromagnetic contactor (52F ₁ ) is excited, its a contact (52F ₁₁ ) is closed, and the electric motor (MF ₁ ) for the first blower (3) is supplied with power via the air volume control device (16). As a result, the temperature of the air flowing into the evaporator (7) is controlled to be substantially constant. After that, when the indoor air humidity reaches a specified value or less, the contact (23HS) of the humidity controller (13) is open, and the contact a (X ₁ ) of the relay (X) is also open. (52C) is demagnetized, and its a contact (52C ₁ ) (52C
C ₂ ) is open circuit, motor (MC) for compressor (1), first blower
The motor for (3) (MF ₁ ) is stopped.

On the other hand, when the air temperature is equal to or higher than the first predetermined temperature even when the air humidity is equal to or lower than the predetermined value, the first and second temperature controllers are provided.
Since the contacts (23RH) and (23RL) of (14) and (15) are closed, the relay (X) is in the energized state and its a-contact (X ₁ ) is closed. The cooling operation indicated by is performed. When the temperature of the inflowing air falls from above the first predetermined temperature to below it, the operation is not performed.

In the air flow control, the temperature of the U vent portion of the condenser is detected in the embodiment, but the outlet temperature of the condenser may be detected. Further, in the above embodiment, the air volume control device is the first condenser.
Although the condensing temperature of (4) is detected and the rotation speed of the first blower (3) is controlled by the condensing temperature, the condensing pressure corresponding to the condensing temperature is detected and the first condensing pressure is used to detect the first condensing pressure. The same effect can be obtained even if the number of revolutions of the blower (3) is controlled.

〔The invention's effect〕

As described above, according to the present invention, the first condenser for circulating the refrigerant from the first condenser provided outdoors to the expansion device is provided.
And a second circuit for circulating the refrigerant from the first condenser to the expansion device via the second condenser for heating the air cooled and dehumidified by the evaporator. A first temperature controller having a switching valve and a first blower for blowing air to the first condenser, which is set to a first predetermined temperature for detecting room temperature, and lower than the first predetermined temperature. The second temperature controller set to the second predetermined temperature, the humidity controller for detecting the indoor humidity, and the temperature (condensation temperature) of the U vent of the first condenser are detected, and the temperature is adjusted according to the condensation temperature. By controlling the switching of the switching valve and controlling the operation of the first blower and the compressor by an air volume control device that controls the air volume of the first blower, a cooling operation, a dehumidifying operation, and an intermediate operation between these operations are performed. Since there is no change in the room temperature due to the switching of the operation mode, As a result, the switching valve and the first
Frequent switching of the blower and repeated operation and stop do not cause trouble. Further, since the refrigerant always flows through the first condenser, the first condenser can be operated even during the dehumidifying operation in winter.
Refrigerant does not collect in the condenser, and proper operation can be continued, and the effect is extremely large. Moreover, since the air volume of the blower of the first condenser is continuously controlled by the refrigerant temperature of the first condenser, the inflow air humidity is equal to or higher than a predetermined humidity and the inflow air temperature is the first predetermined temperature. To the second predetermined temperature, the operation can be performed so that the heating amount Q ₁ in the second condenser and the heat absorption amount Q ₄ in the evaporator are substantially equal to each other, and the inflow air temperature of the evaporator ( The room temperature) can be controlled to be almost constant. It is also possible to reduce the noise of the first blower provided outside the room.

[Brief description of drawings]

FIG. 1 is a refrigerant circuit diagram of an air conditioner showing an embodiment of the present invention, FIG. 2 is a characteristic diagram showing the relationship between the condensing temperature and the number of revolutions and noise of a blower, and FIG. 3 is an embodiment of the present invention. FIG. 4 is an electric circuit diagram of an air conditioner showing an example, and FIG. 4 is a refrigerant circuit diagram of a conventional air conditioner. In the figure, (1) is a compressor, (3) is a first blower, (4) is a first condenser, (5) is a throttle device, (6) is a second blower, and (7) is an evaporator. Vessel, (8) is the second condenser, (9b ₁ ) is the first circuit, (9a ₁ )
Is the second circuit, (9) is the switching valve, (13) is the humidity controller, (14)
Is a first temperature controller, (15) is a second temperature controller, and (16) is an air volume control device. In the drawings, the same reference numerals indicate the same or corresponding parts.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takeshi Sugimoto 6-5-6 Tehira, Wakayama, Wakayama Sanryo Electric Co., Ltd. Wakayama Works (56) References Actual Open Sho 51-18059 (JP, U) Actual Open Sho 48-68950 (JP, U)

Claims (1)

[Claims] 1. A compressor, a first condenser that is blown by a first blower, a throttle device, an evaporator that is blown by a second blower, and is provided on the leeward side of this evaporator, A second condenser that is blown by a blower, a first circuit that is provided between the first condenser and the expansion device, and that allows a refrigerant to flow in order from the first condenser to the expansion device. A second circuit for circulating a refrigerant from the first condenser to the expansion device via the second condenser, a switching valve for selectively switching between the first circuit and the second circuit, A first temperature controller which is set to a first predetermined temperature and detects an inflow air temperature of the evaporator, and a second predetermined temperature which is lower than the first predetermined temperature and which is an inflow air temperature of the evaporator. Temperature controller to detect the above, the evaporator set to a predetermined humidity A humidity controller for detecting the inflow air humidity of the first condenser, and an air volume controller for detecting the refrigerant state of the first condenser and continuously controlling the air quantity of the first blower according to the condensation temperature of the refrigerant. The humidity of the air flowing into the evaporator is equal to or higher than the predetermined humidity,
When the temperature of the inflowing air drops from above the first predetermined temperature to below, the switching valve is switched from the first circuit to the second circuit by the first temperature controller, and the temperature of the evaporator is changed. When the inflow air temperature is in the range from the first predetermined temperature to the second predetermined temperature, the air volume of the first blower is reduced as the inflow air temperature decreases, and the inflow air is also reduced. As the temperature rises, the air volume of the first blower is continuously controlled so as to increase the air volume of the first blower, and the inflow air humidity of the evaporator is equal to or higher than the predetermined humidity,
When the temperature of the inflowing air drops from above the second predetermined temperature to below, the second temperature controller stops the first blower controlled by the air volume control device, and the evaporator When the temperature of the inflowing air is less than the first predetermined temperature and the humidity of the inflowing air drops from above the predetermined humidity to below, the compressor is stopped by the humidity controller, and the inflowing air of the evaporator is stopped. Humidity is below the specified humidity,
The air conditioner is configured to stop the compressor by the first temperature controller when the temperature of the inflowing air drops from above the first predetermined temperature to below.