JPH0554018B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an air conditioner for cooling and dehumidifying in manufacturing processes and the like.

[Conventional technology]

A conventional air conditioner of this type will be explained with reference to FIG. In FIG. 8, the high-temperature, high-pressure gas refrigerant discharged from the compressor 1 flows as shown by solid arrows during cooling operation. That is, the air passes through the three-way valve 2 and reaches the first condenser 4 where air is blown by the first blower 3, where it is condensed and liquefied. Thereafter, the pressure is reduced by the throttle device 5, and the air is evaporated in the evaporator 7, which is blown by the second blower 6, and then returned to the compressor 1. Next, during dehumidification operation, the high-temperature, high-pressure gas refrigerant discharged from the compressor 1 passes through the three-way valve 2, is provided on the leeward side of the evaporator 7, and is blown by the second blower 6, as shown by the broken line arrow. It reaches a second condenser 8 where it is condensed and liquefied. Thereafter, the pressure is reduced by the expansion device 5, evaporated by the evaporator 7, and returned to the compressor 1. On the other hand, during the cooling operation, the air that has flowed into the evaporator 7 is cooled and dehumidified in the evaporator 7 and blown out. During the dehumidification operation, the air is cooled and dehumidified in the evaporator 7 and then transferred to the second condenser 8. It is heated and blown out as dry air. Note that the first condenser 4 is usually installed outdoors.

[Problem that the invention attempts to resolve]

Conventional air conditioners having cooling and dehumidification functions have the following problems because they are configured as described above.

First, when only dehumidifying operation is performed, such as in winter, the three-way valve 2 is switched to the state shown by the broken line, but the refrigerant leaking from the three-way valve 2 is transferred to the first condenser 4, which is exposed to low-temperature outside air. It becomes a liquid refrigerant and accumulates inside. For this reason, the amount of refrigerant in the refrigerant circuit for dehumidifying operation gradually decreases over a long period of time, making normal operation impossible. In addition, the temperature of the outlet air during dehumidification operation rises much more than the intake air temperature (because the enthalpy of the air increases by the input of compressor 1), so room temperature fluctuations during cooling operation and dehumidification operation are growing. For this reason, when attempting to control the temperature and humidity to predetermined levels, the three-way valve 2 is frequently switched, which may cause the three-way valve 2 to malfunction.

This invention has been made to solve the above-mentioned problems, and aims to provide an air conditioner that prevents frequent refrigerant circuits and allows stable operation.

(Means for Solving the Problems) An air conditioner according to the present invention includes a first circuit for circulating refrigerant from a first condenser provided outdoors to a throttling device, and a a solenoid valve group for switching between a second circuit for causing refrigerant to flow through a second condenser provided indoors and to a throttling device;
a first temperature regulator that includes a first blower for blowing air to the first condenser and is set to a first predetermined temperature that detects room temperature; The above objective is achieved by controlling the switching of the solenoid valve group and the operation of the first blower and compressor using a second temperature controller set to the temperature and a humidity controller that detects the indoor humidity. This is what I am trying to do.

[Effect]

The air conditioner according to the present invention switches the solenoid valve group from the first circuit to the second circuit when the indoor air temperature drops to a first predetermined temperature when the indoor air humidity is high, and further switches the solenoid valve group from the first circuit to the second circuit. When the temperature drops to a predetermined temperature, the first blower is stopped, and after the humidity drops to a predetermined temperature, the compressor is stopped, and
If the indoor air humidity is below the specified humidity,
The compressor is configured to stop when the temperature drops to the first predetermined temperature.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described based on the drawings. Note that explanations of parts that are the same as or equivalent to those in FIG. 8 will be omitted. FIG. 1 is a refrigerant circuit diagram showing one embodiment of the invention, and FIG. 2 is an electric circuit diagram showing one embodiment of the invention.

In FIG. 1, 9 is a solenoid valve group, which is composed of solenoid valves 9a and 9b. One end of the solenoid valves 9a and 9b is connected to the first condenser 4, and the other end of the solenoid valve 9a is connected to the second condenser. 8, the other end of the solenoid valve 9b is connected to the liquid reservoir 10, and a first circuit _9b1 through which refrigerant flows only through the solenoid valve 9b, and a second condenser 8 from the solenoid valve 9a.
forms a second circuit _9a1 through which the refrigerant flows. A check valve 11 is provided between the solenoid valve 9b and the liquid reservoir 10 to prevent the refrigerant from flowing back from the solenoid valve 9b to the second condenser 8. During cooling operation, in the case of the first circuit 9a ₁ , the second condenser 8
The refrigerant does not circulate and is cooled by the blown air passed through the evaporator 7, and a part of the refrigerant that has passed through the solenoid valve 9b moves to the condenser 8 and stays there, reducing the amount of refrigerant that circulates. become. This is prevented by the check valve 11. 12 is an accumulator. Reference numeral 13 denotes a humidity controller for detecting the humidity of the air sucked into the evaporator 7, and has a humidity sensing section 18a. Reference numerals 14 and 15 denote first and second temperature regulators for detecting the temperature of the air sucked into the evaporator 7, and each has a temperature sensing section 14a, 15a, and the first temperature regulator 14 has a temperature sensor 14a, 15a. is set to a predetermined temperature of
The temperature regulator 15 is set to a second predetermined temperature lower than the first predetermined temperature.

Next, the electric circuit will be explained. In FIG. 2, MC is a motor for the compressor 1, and MF ₁ and MF ₂ are motors for the first and second blowers 3 and 6, respectively.
52C is an electromagnetic contactor for the motor MC for the compressor 1, and 52C ₁ and 52C ₂ are its a contacts. 5
2F ₁ and 52F ₂ are the first and second blower 3, respectively.
It is an electromagnetic contactor for electric motors MF ₁ and MF ₂ for 6,
52F ₁₁ and 52F ₂₁ are electromagnetic contactors 52F ₁ and 52F 21, respectively.
This is the a contact of _52F2 . SVa is a coil of the solenoid valve 9a, and SVb is a coil of the solenoid valve 9b. X is a relay, _X1 is its a contact, and _X2 is its b contact.
23HS is the contact point of humidity regulator 13 and a of relay
A parallel circuit is formed with the contact _X1 , and this parallel circuit is in series with the electromagnetic contactor 52C. 23RH is a contact point of the first temperature regulator 14, which is in series with the parallel circuit formed by the relay X and the coil SVb of the second electromagnetic valve 9b. 23RL is a contact point of the second temperature regulator 15, and a contact point 5 of the electromagnetic contactor 52C.
2C ₂ and an electromagnetic contactor 52F ₁ form a series circuit. SW is a drive switch, and SS is a group of safety switches.

Next, the effect will be explained. First, when the operation switch SW is turned on, the electromagnetic contactor 52F ₂ is excited, its a contact 52F ₂₁ is closed, and the electric motor MF ₂ for the second blower 6 is operated. When the air sucked into the evaporator 7 has a predetermined humidity or higher and a first predetermined temperature or higher, the contact 23 of the humidity regulator 13
Since the contacts 23RH and 23RL of the HS, first and second temperature regulators 14 and 15 are closed,
The electromagnetic contactor 52C is excited, and its a contact 52
C ₁ and 52C ₂ are closed, and the electric motor MC for the compressor 1 is operated. In addition, the coil SVb of the second solenoid valve 9b
is excited and opens, and the coil of the first solenoid valve 9a
SVa, due to the excitation of relay X, its B contact X ₂
Since the circuit is open, it is in a demagnetized state, and the solenoid valve 9a
is closed. Furthermore, since the electromagnetic contactor 52F ₁ is excited, its A contact 52F ₁₁ is closed, and the electric motor MF ₁ for the blower 3 is operated. As a result, the refrigerant flows as shown by the solid line arrow in FIG. Cooling operation is performed. That is, the high-temperature, high-pressure gas refrigerant discharged from the compressor 1 is condensed in the first condenser 4, and then passes through the second electromagnetic valve 9b to the liquid reservoir 1.
Flows into 0. The liquid refrigerant flowing out from the liquid reservoir 10 is depressurized by the expansion device 5, evaporated by the evaporator 7, separated into gas and liquid by the accumulator 12, and returned to the compressor 1. On the other hand, the indoor air is cooled and dehumidified in the evaporator 7, passes through the second condenser 8, and is blown into the room again, but since no refrigerant is flowing through the second condenser 8, Not heated. Therefore, the indoor air temperature gradually decreases. As the operation continues in this way, the indoor air temperature reaches the first level.
When the temperature drops below a predetermined temperature, the first temperature regulator 14 detects this and opens its contact 23RH. Therefore, the coil SVb of the solenoid valve 9b is demagnetized, so that the solenoid valve 9b is closed, and conversely, the relay X is demagnetized, its b contact X ₂ is closed, and the solenoid valve 9a
The coil SVa is excited, and the solenoid valve 9a is opened. 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 in the evaporator 7 is slightly heated in 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 to the compressor 1 is Q ₃ , and the heat absorption amount in the evaporator 7 is Q ₄ , Q ₁ =Q ₃ +Q ₄ −Q ₂ holds true. Therefore, depending on the amount of heat dissipated in the first condenser 4, there are cases where Q ₁ >Q ₄ and cases where Q ₁ <Q ₄ . When Q ₁ >Q ₄ , the indoor air temperature gradually rises, and when it exceeds the first predetermined temperature, the operation is switched again to the operation indicated by the solid line arrow in FIG. 1. Further, if the humidity reaches a predetermined value or less before exceeding the first predetermined temperature, the humidity controller 13 detects this and the contact 23HS thereof opens. On the other hand, relay X is in a demagnetized state and its a contact is open. Therefore, the electromagnetic contactor 52C is demagnetized,
The a contacts 52C ₁ and 52C ₂ are opened, and the compressor 1
The electric motor MC for the first blower 3 and the electric motor MF ₁ for the first blower 3 are stopped. Conversely, when Q ₁ <Q ₄ , the indoor temperature air gradually decreases, and when it reaches the second predetermined temperature, the contact 23RL of the second temperature regulator 15 opens,
The electromagnetic contactor 52F ₁ is demagnetized, and its a contact 52
F ₁₁ opens. For this reason, the first blower 3 electric motor MF ₁ stops, so the amount of heat dissipated Q ₂ in the first condenser 4 decreases significantly, and conversely, the amount of heat Q ₁ in the second condenser 8 decreases. The increased air, thus cooled and dehumidified in the evaporator 7, is sufficiently heated in the second condenser 8 and blown out as dry air. In this way, a so-called dehumidifying and drying operation is performed, and when the indoor air humidity reaches a predetermined value or less, the humidity controller 13
Since _{the contact 23HS of the relay X is open, and the a contact X1 of the} relay
Electric motor MC for compressor 1, electric motor for first blower 3
MF ₁ stops.

On the other hand, even if the air humidity is below a predetermined value, when the air temperature is above the first predetermined temperature, the contacts 23RH, 23 of the first and second temperature regulators 14, 15
Since RL is closed, relay X is in an energized state, and its a contact X ₁ is closed, and a cooling operation is performed as indicated by the solid line arrow in FIG.

〔Effect of the invention〕

As described above, according to the present invention, there is provided a first circuit for circulating refrigerant from a first condenser provided outdoors to a throttling device, and a first circuit for circulating refrigerant from the first condenser to the evaporator for cooling and dehumidification. the second to heat the air
a second circuit for circulating the refrigerant to the throttling device through the condenser; and a first blower for blowing air to the first condenser. a first temperature controller set to a predetermined temperature; and a second temperature regulator set to a predetermined temperature of
A second temperature controller set to a predetermined temperature of , dehumidifying operation, and an intermediate operation between these, the fluctuation in room temperature due to operation switching is small, and as a result, frequent switching and repeated operation and stopping of the switching valve and the first blower are avoided. There is no problem, and breakdowns are less likely to occur. In addition, since refrigerant always flows through the first condenser, even during dehumidification operation in winter, refrigerant does not accumulate in the first condenser and proper operation can continue, which is extremely effective. It's large. Furthermore, since the check valve is provided in the flow path on the outlet side of the second condenser, a portion of the refrigerant that passes through the electromagnetic valve and enters the throttling device is prevented from moving to the second condenser and becoming trapped therein.

[Brief explanation of the drawing]

Fig. 1 is a refrigerant circuit diagram of an air conditioner showing an embodiment of the present invention, Fig. 2 is an air circuit diagram of an air conditioner showing an embodiment of the invention, and Fig. 3 is a diagram of a conventional air conditioner. It is a refrigerant circuit diagram. 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, 7 is an evaporator, 8 is a second
a condenser, 9 a solenoid valve group, 13 a humidity conditioner, 1
4 is a first temperature regulator, and 15 is a second temperature regulator. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1 a compressor 1, a first condenser 4 blown by a first blower 3, a throttling device 5, an evaporator 7 blown by a second blower 6; A second condenser 8 is provided between the first condenser 4 and the expansion device 5, and the refrigerant is supplied from the first condenser 4 to the expansion device 5 in this order. A first circuit for circulating the refrigerant, a second circuit for circulating the refrigerant from the first condenser 4 to the expansion device 5 via the second condenser 8, the first circuit and the second circuit. a group of electromagnetic valves 9 for selectively switching the circuit to the circuit; a check valve 11 disposed on the outlet side of the second condenser 8 to prevent backflow of refrigerant from the inlet side of the throttle device 5;
a first temperature controller 14 that is set at a first predetermined temperature and detects the temperature of the inflow air of the evaporator 7; A second temperature regulator 15 for detecting air temperature, a humidity regulator 13 set to a predetermined humidity and detecting the humidity of the air flowing into the evaporator 7, the air flowing into the evaporator 7 having a humidity higher than the predetermined humidity, and when the temperature is higher than the first predetermined temperature, the solenoid valve and check valve of the second circuit are closed;
By opening the solenoid valve of the first circuit, the first
When the air flowing into the evaporator 7 has a humidity equal to or higher than the predetermined humidity and has decreased to the first predetermined temperature, the first temperature regulator 14
The solenoid valve group switches from the first circuit to the second circuit, and when the first predetermined temperature decreases to the second predetermined temperature, the second temperature regulator 15 switches the first circuit to the second circuit. furthermore, when the humidity drops to a predetermined humidity, the compressor 1 is stopped by the humidity regulator 13, and when the air flowing into the evaporator 7 is below the predetermined humidity and the humidity is lower than the predetermined humidity, 1, the compressor 1 is stopped by the first temperature controller 14, and the refrigerant is stopped by the check valve 11 in the flow path on the outlet side of the second condenser 8. An air conditioner characterized in that a part of the air conditioner is configured to be prevented from moving to the second condenser 8 and sleeping therein.