JPH0833252B2 - Dehumidifier - Google Patents

Description

TECHNICAL FIELD The present invention relates to an improvement of a dehumidifying device using a refrigeration cycle.

[Conventional technology]

FIG. 3 is a block diagram showing a conventional dehumidifier, in which (1) is a compressor, (2) is a refrigerant pipe (not shown) through which a refrigerant flows, and is attached to the outer peripheral surface of this refrigerant pipe. A condenser provided with a fin (not shown), (3) a throttle device, (4) a refrigerant pipe (not shown) through which a refrigerant flows, and a fin (not shown) attached to the outer peripheral surface of this refrigerant pipe. No)
In the evaporator provided with, the refrigeration cycle is configured by sequentially connecting these with the refrigerant pipe (5). (6) is a blower that blows indoor air in series from the evaporator (4) to the condenser (2), (7) is a drain pan disposed below the evaporator (4), and (8) is a drain pan ( It is a drainage pipe connected to 7).

Next, the operation will be described. The high-temperature and high-pressure gas refrigerant discharged from the compressor (1) is cooled in the condenser (2) by exchanging heat with the room air that has passed through the evaporator (4) blown by the blower (6) in the direction of the arrow. It is condensed and becomes high pressure liquid refrigerant. Then, this high-pressure liquid refrigerant is decompressed in the expansion device (3) to become a low-pressure gas-liquid two-phase refrigerant, and further in the evaporator (4), heat is exchanged with the room air blown by the blower (6) in the direction of the arrow to evaporate. , Becomes a low-pressure gas refrigerant and returns to the compressor (1).

On the other hand, the indoor air is blown by the blower (6) from the evaporator (4) to the condenser 2 in series in the arrow direction, and is supplied from the expansion device (3) to the evaporator (4) when passing through the evaporator (4). Since the fins are cooled by exchanging heat with the low-pressure gas-liquid two-phase refrigerant and the fin surface temperature of the evaporator (4) is lower than the dew point temperature of the blown indoor air, dew condensation occurs on the fin surfaces and dehumidifies by this dew condensation. The dehumidified indoor air is further heated in the condenser (2) by exchanging heat with the high-temperature and high-pressure gas refrigerant discharged from the compressor (1), and the temperature rises due to heating and the relative humidity decreases and returns to the room. The indoor air is gradually dehumidified by the circulation of the indoor air. The dew condensation water that has condensed on the surface of the fins travels down the surface of the fins by gravity and drops into the drain pan (7), and is discharged outside the room through the drain pipe (8).

[Problems to be Solved by the Invention]

Since the conventional dehumidifier is configured as described above,
As the humidity of the indoor air becomes lower, the surface area of the evaporator having a surface temperature lower than the dew point temperature of the indoor air becomes small, the amount of dew condensation decreases, and eventually the dew condensation stops. In this way, the dehumidification amount decreases with the decrease in the humidity of the indoor air, and there is a problem that dehumidification becomes impossible in the end.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a dehumidifying device with a small decrease in dehumidification amount even under low humidity conditions.

[Means for solving the problem]

The dehumidifying device according to the present invention is arranged in series with a plurality of evaporators in the blowing direction of room air, and a two-way valve and a throttle device are connected in series with the plurality of evaporators, respectively,
A detection means for detecting the surface temperature of the evaporator and a dew-point temperature detection means for detecting the dew-point temperature of the room air blown to the evaporator are provided, and the detection signals of the both detection means are compared,
While controlling the opening and closing of the two-way valve according to the comparison value,
The amount of air blown to the plurality of evaporators by the air blower is controlled.

A plurality of evaporators are arranged in parallel with respect to the blowing direction of the indoor air to blow the indoor air in parallel, and a two-way valve and a throttle device are connected in series to each of the plurality of evaporators, Temperature detecting means for detecting the surface temperature of the evaporator,
The dew point temperature detecting means for detecting the dew point temperature of the indoor air is compared with the detection signals of both detecting means, and the two-way valve is opened / closed according to the comparison value and the plurality of evaporators are provided by the blowing means. It controls the amount of air blown into.

[Action]

The dehumidifying device in this invention is a dew point temperature detecting means for detecting the dew point temperature of the indoor air blown to the plurality of evaporators,
The control means compares the detection signals of both the temperature detecting means and the temperature detecting means for detecting the temperature of the plurality of evaporators, and according to the comparison value, the two detectors are respectively connected in series to the plurality of evaporators. The one-way valve is controlled to be opened / closed, and the amount of air blown to the plurality of evaporators is controlled by the air blower, so that the surface temperature of the evaporator is maintained below the dew point temperature of the room air.

Further, the two-way valve connected in series to each of the plurality of evaporators by the controller is controlled to be opened and closed by the comparison value, and the plurality of evaporators are blown in parallel by the blowing means. The amount of air blown to each of the evaporators is controlled, and the surface temperature of the evaporators is kept below the dew point temperature of room air.

〔Example〕

Hereinafter, FIG. 1 showing an embodiment of the present invention will be described. In the figure, (9) shows the first and first fins (not shown) provided on the outer peripheral surface of the refrigerant pipe (not shown) for circulating the refrigerant.
Second, third evaporator (4a) (4b) (4c), first, second, third expansion device (3a) (3b) (3c), first, second, third A refrigerant circuit in which serial connection circuits (11a) (11b) (11c) in which the one-way valves (10a) (10b) (10c) are connected in series by refrigerant pipes are connected in parallel, and this refrigerant circuit (9) , Accumulator (12), compressor (1), and condenser (2)
And are sequentially connected by a refrigerant pipe (5) to form a refrigeration cycle. (13a) is the first, second and third evaporators (4a) (4a
b) First to blow indoor air in series in the direction of the arrow to (4c)
Fan (13b) is a second fan that blows indoor air to the condenser (2), and (14a) (14b) (14c) is an evaporator (4
a) A temperature detector that detects the temperature of the refrigerant pipes of (4b) and (4c). Each refrigerant pipe (not shown) surface of the evaporator (4a) (4b) (4c) and the temperature sensing part (not shown) Is installed. Refrigerant piping (not shown) for the evaporators (4a) (4b) (4c)
The surface temperature of the fins (not shown) attached to the outer peripheral surface of the refrigerant is higher than the refrigerant pipe temperatures t14a, t14b, t14c detected by the temperature detectors (14a) (14b) (14c) by a predetermined value.

(15) is a dew point temperature detector that detects the dew point temperature of the indoor air blown to the first, second, and third evaporators (4a) (4b) (4c), and (16) is the temperature detector (14a ) (14b) (14c) and dew point temperature detector (15)
It is a controller that controls opening / closing of the two-way valves (10a) (10b) (10c) according to the comparison value.

Next, the operation will be described. The dew point temperature t15 of the indoor air detected by the dew point temperature detector (15) and the evaporator (4a) (detected by the first, second and third temperature detectors (14a) (14b) (14c) 4b) The refrigerant pipe temperatures t14a, t14b, t14c of (4c) are compared by the controller (16), and the humidity of the indoor air is high and the dew point temperature t15 is the refrigerant pipe of the evaporator (4a) (4b) (4c). Temperature t
If the temperature is higher than the highest temperature of 14a, t14b, t14c by a predetermined value (for example, 5 ° C) or more, that is, if the fin surface temperature of the evaporator is lower than the dew point temperature t15 of the indoor air, the controller (16) allows the first, second and third two-way valves (10
All of a) (10b) (10c) are opened. At this time, the high-temperature and high-pressure gas refrigerant discharged from the compressor (1) is heat-exchanged with the indoor air blown from the second blower (13b) in the condenser (2) to heat the indoor air and After condensation, the first, second and third two-way valves (10a) (10b)
(10c), the first, second, and third diaphragm devices (3
a) (3b) (3c) is reduced in pressure to become a low-temperature low-pressure gas-liquid two-phase refrigerant, and in the first, second, and third evaporators (4a) (4b) (4c), the first blower (13a) ) Heat-exchanges with the room air blown by the air, and the heat is absorbed from the room air to return to the compressor (1) through the accumulator (12). The indoor air blown by the first blower (13a) passes through the first, second, and third evaporators (4a) (4b) (4c) whose fin surface temperature is lower than the dew point temperature of the indoor air. No. 3 from evaporator (4c)
2, The air is blown in series to the first heat generators (4b) and (4a), sequentially cooled, condensed on the fin surface, and dehumidified. The dehumidified indoor air is mixed with the indoor air heated by the condenser (2) in the room to increase the temperature and decrease the relative humidity. The indoor air is gradually dehumidified by the circulation of the indoor air. The first, second and third evaporators (4a) (4b) (4c)
Condensed water that has condensed on the surface of each fin is dropped onto the drain pan (7) and discharged through the drain pipe (8) to the outside of the room.

Next, the indoor humidity is low, and the dew point temperature t15 of the indoor air detected by the dew point detector (15) is the first, second, and third temperature detectors (1
4a) (14b) (14c) detected temperature t14a, 14b, 14c is higher than the highest temperature by a predetermined temperature (for example, 5 ℃) or more, that is, if the fin surface temperature of the evaporator is indoor air When the temperature is higher than the dew point temperature of the controller, the controller (16) sequentially closes the first two-way valve (10a) and the second two-way valve (10b), and then the first, second and third evaporators. By reducing the heat transfer area of the evaporator consisting of (4a), (4b) and (4c), the evaporation temperature of the refrigerant is lowered, and the fin surface temperature of the third evaporator (4c) is lower than the dew point temperature of indoor air. Keep it low and dehumidify by dew condensation on the fin surface.

Even if the first and second two-way valves (10a) and (10b) are closed, the refrigerant pipe temperature t14c of the third evaporator (4c) detected by the third temperature detector (14c) is the dew point temperature detection value. A predetermined value (for example, 5 ° C) from the dew point temperature t15 of the indoor air detected by the device (15)
If the temperature does not drop below the high temperature, the controller (16)
Reduces the evaporation temperature of the refrigerant by decelerating the first blower (13a) to reduce the air volume, and the third evaporator (4
The fin surface temperature in c) is made lower than the dew point temperature t15, and dehumidification is controlled by dew condensation on the fin surface.

The liquid back to the compressor (1) when the first and second two-way valves (10a) (10b) are closed is stored in the accumulator (1
Prevented by 2).

FIG. 2 is a block diagram showing another embodiment of the present invention.
The part that differs from the figure is that the lined up inside the duct (17)
The evaporator (4) is installed in the first, second and third ventilation passages (17a) (17b) (17c).
a) (4b) (4c) are installed respectively, and the blower (13a)
A point in which air is blown in parallel to the evaporators (4a) (4b) (4c) via the second and third ventilation paths (17a) (17b) (17c),
The air passage opening / closing mechanisms (18a) (18b) (18c) are arranged in the first, second and third air passages (17a) (17b) (17c),
Temperature detectors (14a) (14b) (14c) that detect the refrigerant piping temperatures of the first, second, and third evaporators (4a) (4b) (4c), and dew points that detect the dew point temperature of indoor air The two-way valve connected in series to each evaporator (4a) (4b) (4c) according to the comparison value by comparing the detection signals of both the temperature detector (15) with the controller (16). (10a) (10b) (10c) and blower (1
3) Ventilation amount control and ventilation passage opening / closing mechanism (18a)
(18b) and (18c) are controlled to open and close.

Next, the operation will be described. The dew point temperature t15 of the indoor air detected by the dew point temperature detector (15) and the evaporator (4a) (detected by the first, second and third temperature detectors (14a) (14b) (14c) 4b) The refrigerant pipe temperatures t14a, t14b, t14c of (4c) are compared by the controller (16), and the indoor air humidity is high and the dew point temperature t15 is the refrigerant pipe temperature of the evaporators (4a) (4b) (4c). (1
4a) (14b) (14c) If the temperature is higher than the highest temperature by a predetermined value (for example, 5 ° C), that is, if the fin surface temperature of the evaporator is lower than the dew point temperature of indoor air, the controller (16) allows the first, second and third two-way valves (10a) (10b)
All of (10c) are opened. At this time, the high-temperature and high-pressure gas refrigerant discharged from the compressor (1) is heat-exchanged with the indoor air blown from the second blower (13b) in the condenser (2) to heat the indoor air and Is condensed and then distributed to the first, second, and third two-way valves (10a) (10b) (10c), and the first, second, and third expansion devices (3a) (3b) (3
It is decompressed in c) to become a low-temperature low-pressure gas-liquid two-phase refrigerant.
In the second and third evaporators (4a) (4b) (4c), the first blower (13a) causes the first, second and third ventilation passages (17a) (17a)
b) Heat is exchanged with the room air blown through (17c), and the heat is absorbed from the room air to return to the compressor (1) through the accumulator (12). The indoor air blown by the first blower (13a) has a fin surface temperature lower than the dew point temperature of the indoor air, and the first, second, and third evaporators (4a).
(4b) (4c) is blown in parallel and cooled, and the fin surface is condensed and dehumidified. The dehumidified indoor air is mixed with the indoor air heated by the condenser (2) in the room to increase the temperature and decrease the relative humidity. The indoor air is gradually dehumidified by this circulation of air. Condensation water that has condensed on the fin surfaces of the first, second, and third evaporators (4a) (4b) (4c) is dropped onto the drain pans (19a) (19b) (19c) and the drain pipe (2
It is discharged to the outside through the 0).

Next, the indoor humidity is low and the dew point temperature t15 of the indoor air detected by the dew point temperature detector (15) is the detected temperature t14a of the first, second and third temperature detectors (14a) (14b) (14c). When the temperature is not higher than the highest temperature of t14b and t14c by a predetermined value or more, that is, when the fin surface temperature of the evaporator is higher than the dew point temperature of the room air, the controller (16) sequentially turns 1
Close the two-way valve (10a) and the second two-way valve (10b)
By decreasing the heat transfer area of the evaporator consisting of the second and third evaporators (4a) (4b) (4c), the evaporation temperature of the refrigerant is lowered, and the fin surface temperature of the third evaporator (4c) is reduced. Keep the temperature below the dew point of indoor air, and dehumidify it by condensation on the fin surface. Further, in response to this, the controller (16) sequentially closes the first and second ventilation passage opening / closing mechanisms (18a) and (18b) in order to save unnecessary blower power, and the first blower (13).
A) is decelerated to maintain the air volume supplied to the third evaporator (4c) constant.

In addition, even if the first and second two-way valves (10a) (10b) and the first and second ventilation passage opening / closing mechanisms are closed, the third temperature detector (14
Refrigerant pipe temperature t14 of the third evaporator (4c) detected in c)
When c does not become lower than the temperature higher than the dew point temperature t15 of the indoor air detected by the dew point temperature detector (15) by a predetermined value (for example, 5 ° C) or more, the controller (16) uses the first blower. (10a) is further decelerated to reduce the amount of air blown to the third evaporator (4c) to lower the evaporation temperature of the refrigerant,
The fin surface temperature of the third evaporator (4c) is kept lower than the dew point temperature t15, and dehumidification is controlled by dew condensation on the fin surface.

In the above embodiment, the first, second and third evaporators (4a) (4b) (4c) and the condenser (2) are provided with separate first and second blowers (13a) ( 13b) has been described, but the present invention is not limited to this, and the indoor air is shared by the blower and the first, second, and third evaporators (4a) (4b).
The air may be blown from (4c) to the condenser (2).
Condenser (2) for applications where room temperature rises
May be installed outdoors or the air passing through the condenser (2) may be guided to the outside. Also, the capacities of the first, second, and third evaporators (4a) (4b) (4c) are not the same, but different capacities are used, and when the indoor air has a low dew point temperature and low humidity, The two-way valves connected in series to the first, second and third evaporators may be selectively opened and closed according to the capacity difference, and in this case, finer control can be performed. Furthermore, the first, second, and third blowers are individually provided to the first, second, and third evaporators (4a) (4b) (4c), and the first, second, and third blowers are provided. It is also possible to individually control the number of rotations of the above and to control the amount of blown air. Further, in the above embodiments, the temperature of the evaporator piping is detected by the temperature detector having the temperature sensing part attached to the surface of the refrigerant piping forming the evaporator as the surface temperature of the evaporator. The two-way valve connected in series to each of a plurality of evaporators was controlled to be opened and closed according to the comparison value with the detection signal of the dew point temperature detector, but the invention is not limited to this. The fin surface temperature may be detected as the surface temperature of the, and the two-way valve may be controlled to open / close according to a comparison value between this detection signal and the detection signal of the dew point temperature detector of the room air. Further, a temperature sensor utilizing the heat radiation of the infrared sensor may be used as the temperature detector for detecting the surface temperature of the evaporator.

〔The invention's effect〕

As described above, according to the present invention, the respective temperatures of the plurality of evaporators are detected, and the plurality of the plurality of evaporators are detected according to the comparison value between the detection signal and the detection signal of the dew point temperature detector of the indoor air. Since the two-way valves connected in series to the evaporators are controlled to be opened and closed, and the air blowing amount to the plurality of evaporators is controlled by the air blowing means, even if the humidity of the indoor air becomes low, the dehumidifying amount can be controlled. It is effective in dehumidifying with less deterioration and efficient dehumidification.

Further, air is blown in parallel to the plurality of evaporators, the two-way valves connected in series to the plurality of evaporators are controlled to open and close according to the comparison value of the detection signals, and the evaporators of the plurality of evaporators are controlled. By controlling the air flow, even in low humidity conditions,
Dehumidification can be performed more efficiently.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing another embodiment of the present invention, and FIG. 3 is a block diagram showing a conventional dehumidifier. In the figure, (1) is a compressor, (2) is a condenser, and (3a)
(3b) and (3c) are first, second, and third diaphragm devices, and (4a) and (4b)
(4c) is an evaporator, (10a), (10b) and (10c) are first, second and third two-way valves, (13a) and (13b) are first and second blowers, and (14)
a) (14b) (14c) is a temperature detector, (15) is a dew point temperature detector, (16) is a controller, (17a) (17b) (17c) is the first,
The second and third ventilation channels, (18a) (18b) (18c) are the first, second,
It is a third ventilation passage opening / closing mechanism. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (2)

[Claims] 1. A refrigerant circuit comprising a two-way valve, a throttle device, and an evaporator, which are connected in series by a refrigerant pipe to connect a plurality of series-connected circuits in parallel, a compressor, and a condenser. A refrigeration cycle sequentially connected by pipes, a blowing means for blowing indoor air in series to the plurality of evaporators, a temperature detecting means for detecting the temperature of the plurality of evaporators, and the indoor air Dew point temperature detecting means for detecting the dew point temperature of the, and the detection signals of the both detecting means are compared, and the plurality of two-way valves are controlled to open and close according to the comparison value, and the plurality of each of the plurality of blower means are provided. A dehumidifying device comprising a control means for controlling the amount of air blown to the evaporator. 2. A refrigerant circuit comprising a plurality of series connection circuits connected in parallel, wherein a two-way valve, a throttle device and an evaporator are connected in series by a refrigerant pipe, a compressor and a condenser. A refrigeration cycle sequentially connected by pipes, a blowing means for blowing indoor air in parallel to the plurality of evaporators, a temperature detecting means for detecting the temperature of the evaporator, and a dew point temperature of the indoor air. Dew point temperature detection means for detecting the, and the detection signals of both the detection means are compared, the two-way valve is controlled to be opened and closed according to the comparison value, and the air blown by the air blower to each of the plurality of evaporators. A dehumidifying device, comprising: