JP4411986B2 - Dehumidifier - Google Patents

Description

  The present invention relates to a dehumidifier that performs cooling and dehumidification using a refrigeration cycle.

  Conventionally, a dehumidifier equipped with an internal heat exchanger is known as this type of dehumidifier (see, for example, Patent Document 1).

  Hereinafter, the dehumidifier will be described with reference to FIG.

  As shown in the figure, the dehumidifier body 101 connects the compressor 102, the condenser 103, the expansion device 104, and the evaporator 105 in this order by the refrigerant pipe 106 to form a refrigeration cycle, and is dehumidified by the evaporator 105. A heat pump that cools and dehumidifies air is used as a main body, and a cross-flow type internal heat exchanger 107 is disposed in the air path from the evaporator 105 to the condenser 103.

In the above configuration, the air flowing in from the inlet A 108 enters the internal heat exchanger 107, is pre-cooled by exchanging heat with the air that has already been cooled and dehumidified by the evaporator 105, and exits from the outlet A 109. Then, the air flow is changed by 270 ° by the air passage 110, and the air is cooled and dehumidified through the evaporator 105. Thereafter, the cooled and dehumidified air enters the internal heat exchanger 107 again from the inlet B111 of the internal heat exchanger 107, is heated by the air flowing in from the inlet A108, exits from the outlet B112, and is further heated by the condenser 103. Then, the air is blown out by the blower fan 113.
JP 63-135731 A

  Such a conventional dehumidifier requires an air passage 110 in which the air flow changes by 270 ° from the primary outlet of the internal heat exchanger 107 through the evaporator 105 to the secondary inlet of the internal heat exchanger 107. Therefore, there is a problem that the dehumidifier body 101 becomes large, and an air path configuration that enables the dehumidifier body 101 to be downsized is required.

  In addition, since the air flow has an air passage that changes by 270 °, the internal heat exchanger 107, the condenser 103, and the evaporator 105 are biased in the wind speed distribution, and the heat transfer performance cannot be sufficiently exhibited. There is a need to improve heat transfer performance.

  In addition, since sensible heat exchange is mainly performed in the internal heat exchanger 107, there is a problem that temperature distribution is uneven in the outlet A109 and the outlet B112 of the internal heat exchanger 107, and the heat transfer performance cannot be sufficiently exhibited. Yes, it is required to improve the efficiency during heat exchange and increase the dehumidifying capacity.

  The present invention solves such a conventional problem, and an object of the present invention is to provide a dehumidifier capable of reducing the size of the dehumidifier body and improving the dehumidification efficiency.

  In order to achieve the above object, the dehumidifier of the present invention includes a compressor, a condenser, a throttle means, and an evaporator in the main body, and forms a refrigeration cycle by connecting the refrigerant pipes in this order. An internal heat exchanger and a curved air passage are provided so that heat exchange is performed between the air that enters the evaporator through the air inlet and the air that has been cooled and dehumidified after passing through the evaporator. The evaporator is arranged so as to block the passage a plurality of times, and the air that has exited the primary flow path of the internal heat exchanger passes through the evaporator and enters the secondary flow path of the internal heat exchanger. Is.

  By this means, the dehumidifier body can be reduced in size and a dehumidifier capable of improving the dehumidification efficiency can be obtained.

  The other means is that an evaporator is disposed in the curved air passage, and the ventilation resistance of the evaporator is made smaller outside the inside of the curved air passage so as to exit the primary flow path of the internal heat exchanger. The air that has passed through the evaporator enters the secondary flow path of the internal heat exchanger.

  By this means, a dehumidifier capable of improving the dehumidifying efficiency is obtained.

  Another means is to arrange the evaporator so as to block the curved air passage a plurality of times, and the ventilation resistance of the evaporator is smaller on the outside than on the inside of the curved air passage.

  By this means, the dehumidifier body can be reduced in size and a dehumidifier capable of improving the dehumidification efficiency can be obtained.

  Further, the other means is provided with a bypass part that partially bypasses the evaporator at least once.

  By this means, a dehumidifier capable of improving the dehumidifying efficiency is obtained.

  Another means is that the refrigerant path of the condenser is the air inlet side of the air to be dehumidified by the internal heat exchanger, and the outlet side of the air flowing from the internal heat exchanger to the evaporator is the upstream side of the refrigerant. The downstream side of the refrigerant.

  ADVANTAGE OF THE INVENTION According to this invention, the dehumidifier which can improve the efficiency of a condenser and can improve dehumidification efficiency is obtained.

  In addition, the other means is arranged so as to be inclined in the curved air passage of the evaporator, and smoothly changes the wind direction of the curved air passage.

  ADVANTAGE OF THE INVENTION According to this invention, the dehumidifier main body can be reduced in size and the dehumidifier which can improve dehumidification efficiency is obtained.

  Another means is that the refrigerant downstream side of the evaporator is positioned on the windward side by reversing the refrigerant path at the connection portion between the evaporators.

  ADVANTAGE OF THE INVENTION According to this invention, the dehumidifier which can improve dehumidification efficiency is obtained.

  Another means is to exchange heat between the air passing through the condenser side of the internal heat exchanger and the downstream side of the refrigerant in the refrigerant path of the evaporator.

  ADVANTAGE OF THE INVENTION According to this invention, the dehumidifier which can improve dehumidification efficiency is obtained.

  ADVANTAGE OF THE INVENTION According to this invention, the dehumidifier which can improve the efficiency of an evaporator can be provided by passing an evaporator in multiple times, while the air which flows out out of an internal heat exchanger returns to an internal heat exchanger again.

  In addition, by reducing the ventilation resistance of the evaporator outside the inside of the curved air passage, it is possible to provide a dehumidifier that improves the bias of the air flow through the evaporator and improves the efficiency of the evaporator.

  In addition, a dehumidifier that can further improve the efficiency of the evaporator by passing through the evaporator a plurality of times in the curved air passage and making the ventilation resistance of the evaporator smaller outside the inside of the curved air passage. Can be provided.

  Further, in the configuration in which the evaporator is passed a plurality of times in the curved air passage, by providing an air passage that partially bypasses the evaporator at least once, the deviation of the air flow through the evaporator is improved, and the evaporator It is possible to provide a dehumidifier that can improve the efficiency.

  Further, in the refrigerant path of the condenser, the inlet side of the air to be dehumidified by the internal heat exchanger is the upstream side of the refrigerant, and the outlet side of the air flowing from the internal heat exchanger to the evaporator is the downstream side of the refrigerant By doing so, the dehumidifier which can improve the efficiency of a condenser can be provided.

  Also, when passing through the evaporator several times in the curved air passage, each evaporator smoothly changes the direction of the air flow, realizing efficient air flow and reducing the curved air passage In addition, a dehumidifier that can improve the heat exchange efficiency of the evaporator can be provided.

  Moreover, the dehumidifier which can improve the efficiency of an evaporator can be provided by reversing a refrigerant path in the part where a wind direction reverses with an evaporator, and making the refrigerant | coolant downstream side of the said evaporator always be an upwind side.

  In addition, in the refrigerant path of the evaporator, heat is exchanged between the air that has passed through the condenser side of the internal heat exchanger and the downstream side of the refrigerant, so that the temperature of the air cooled by the internal heat exchanger is high. It is possible to provide a dehumidifier capable of efficiently ensuring the degree of superheating of the refrigerant by air and improving the efficiency of the evaporator.

  The invention according to claim 1 of the present invention includes a compressor, a condenser, a throttle means, and an evaporator in the main body, and forms a refrigeration cycle by connecting the refrigerant pipes in this order. An internal heat exchanger and a curved air passage are provided so that heat exchange is performed between the air entering the evaporator from the inlet and the cooled and dehumidified air after passing through the evaporator, and a plurality of the curved air passages are provided. The evaporator is arranged so as to shut off, and the air that has exited the primary flow path of the internal heat exchanger passes through the evaporator and enters the secondary flow path of the internal heat exchanger. By passing through the evaporator in a plurality of times, the heat exchange efficiency can be improved by reducing the bypass factor that passes through the evaporator without sufficient heat exchange.

  In addition, a compressor, a condenser, a constricting means, and an evaporator are provided in the main body, and in this order, the refrigerant pipes are connected to form a refrigeration cycle. An internal heat exchanger and a curved air passage so that heat exchange is performed between the air and the dehumidified air after passing through the evaporator, and the evaporator is disposed in the curved air passage, The ventilation resistance of the evaporator is small outside the inside of the curved air passage, and the air that has exited the primary flow path of the internal heat exchanger passes through the evaporator and passes through the secondary flow path of the internal heat exchanger. In the curved air passage where the 270 ° wind direction changes, the inner flow with a short moving distance increases while the ventilation resistance of the evaporator in the inner flow portion is large. Air flows to the outside where the draft resistance of the vessel is small, The deviation of the distribution is suppressed, it is possible to improve the heat exchange efficiency of the evaporator. Since the surface area of the evaporator in the inner flow portion where the air volume is large is increased, the heat exchange efficiency of the evaporator can be further improved.

  In addition, the ventilation resistance of the evaporator is smaller at the outside than the inside of the curved air passage, and the evaporator can be widely arranged by taking advantage of the space of the curved air passage, so that it evaporates by ensuring a sufficient heat transfer area. The capacity as a heat exchanger can be improved, and the heat exchange efficiency can be improved by reducing the bypass factor that passes through the evaporator without sufficient heat exchange by passing through the evaporator in several times. In addition, in a curved air passage where the 270 ° wind direction changes, the bias of the entire wind speed distribution is suppressed, and the heat exchange efficiency of the evaporator can be improved.

  Further, at least once, a bypass portion that partially bypasses the evaporator is provided, and in the curved air passage where the 270 ° wind direction changes, the inner flow with a short moving distance increases, while the outer flow increases. Since the bypass portion of the evaporator is provided in the flow portion, air flows to the outside, the bias of the entire wind speed distribution is made uniform, and the heat exchange efficiency of the evaporator can be improved.

  Further, in the refrigerant path of the condenser, the inlet side of the air to be dehumidified by the internal heat exchanger is the upstream side of the refrigerant, and the outlet side of the air flowing from the internal heat exchanger to the evaporator is the downstream side of the refrigerant Thus, the temperature difference between the air and the refrigerant is secured against the temperature deviation of the secondary flow path of the internal heat exchanger immediately before the condenser, and the heat exchange efficiency of the condenser can be improved.

  In addition, the evaporator is disposed in an inclined manner in the curved air passage, and the wind direction of the curved air passage is changed smoothly. In the curved air passage that changes the 270 ° air direction, the evaporator is deflected in a small space. The wind direction can be changed smoothly, and the curved air passage can be reduced in size by reducing the disturbance of the wind speed distribution, and the efficiency of the evaporator can be improved.

  In addition, by reversing the refrigerant path at the connection part between the evaporators, the refrigerant downstream side of the evaporator is positioned on the windward side, and the flow of air and the refrigerant can be maintained in a counterflow, It has the effect that the heat exchange efficiency of the evaporator can be improved.

  Further, in the refrigerant path of the evaporator, the air passing through the condenser side of the internal heat exchanger exchanges heat with the downstream side of the refrigerant, and the flow on the evaporator side of the primary flow path of the internal heat exchanger is While heat is always exchanged with the air immediately after being cooled and dehumidified by the evaporator, the flow on the condenser side of the primary flow path exchanges heat with the cooled and dehumidified air that has been warmed to some extent, so there is a temperature bias. The refrigerant in the superheat area downstream of the refrigerant in the evaporator exchanges heat with the air in the condenser side, which is relatively high in temperature, ensuring a temperature difference and being in good condition. It has the effect | action that the heat exchange efficiency of can be improved.

  Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1)
In FIG. 1, a main body 1 of a dehumidifier includes a compressor 102, a condenser 2, a capillary tube 4 as an expansion device, and an evaporator 3 connected in this order by a refrigerant pipe 5 to form a refrigeration cycle. A cross-flow type internal heat exchanger 107 is arranged in the air path from the evaporator 3 to the condenser 2 using a heat pump that cools and dehumidifies the air to be processed.

  Here, the evaporator 3 is divided into an evaporator 3a on the windward side with respect to the wind path and an evaporator 3b on the leeward side, and the evaporator 3b is composed of a first row portion and a second row portion.

  Further, the evaporators 3a and 3b are arranged with an inclination in the curved air passage 6 so that the air flow passing through the curved portion can be smoothly changed in the wind direction.

  Further, the refrigerant flow paths are crossed at the connection portions of the evaporators 3a and 3b so that the refrigerant downstream side of the evaporators 3a and 3b is positioned on the windward side.

  Further, in the evaporator 3a, the air that has passed through the condenser 2 side of the internal heat exchanger 107 and the downstream side of the refrigerant exchange heat.

  Further, in the condenser 2, the inlet A108 side is the upstream side of the refrigerant, and the outlet A109 side is the downstream side of the refrigerant.

  In the above configuration, the air flowing in from the inlet A 108 enters the internal heat exchanger 107, is pre-cooled by exchanging heat with the air already cooled and dehumidified by the evaporator 3, and exits from the outlet A 109. Then, the air flow is changed by 270 ° by the curved air passage 6, and the air is cooled and dehumidified through the evaporator 3. The cooled and dehumidified air enters the internal heat exchanger 107 again from the inlet B111 of the internal heat exchanger 107, is heated by the air flowing in from the inlet A108, exits from the outlet B112, and is further heated by the condenser 2. The air is blown out by the blower fan 113.

  Here, when the air to be dehumidified enters from the inlet A108 into the apparatus, the flow on the inlet B111 side is defined as the air flow path 7a and the flow on the outlet B112 side is defined as the air flow path 7b. When the air temperature at the inlet A108 is set to 27 ° C., the air passing through the air flow path 7a always exchanges heat with the low-temperature air of 13 to 15 ° C. cooled and dehumidified by the evaporator 3 entering from the inlet B111. Therefore, it cools efficiently and falls to about 16 degreeC in outflow port A109.

  On the other hand, since the air passing through the air flow path 7b is on the downstream side of the air entering from the inflow port B111, it is difficult to obtain a sufficient temperature difference, and the outflow rate A109 is about 21 ° C., resulting in a temperature bias. Such air is guided along the curved air passage 6 to the evaporator 3a while maintaining the tendency of the temperature distribution.

  In the evaporator 3a, the air cooled by the internal heat exchanger 107 is disposed in the air flow path 7b at the downstream portion of the refrigerant path that is in the superheat range, particularly the evaporator 3 refrigerant outlet portion that has the highest superheat degree. Among them, the superheat degree of the refrigerant can be efficiently secured by the high-temperature air, and the performance of the evaporator 3 can be improved.

  Further, the temperature of the refrigerant is kept constant in the two-phase region where the latent heat is exchanged, but the temperature rises in the superheat degree region that becomes a gas. Therefore, it is desirable to arrange the downstream part of the refrigerant path that becomes the overheating region on the windward side. In the present embodiment, the refrigerant flow path is reversed at the connection portion between the evaporator 3a and the evaporator 3b, and the downstream portion of the refrigerant path is always arranged on the wind side with respect to the wind direction. Exchange efficiency can be improved.

  Further, by using the space of the curved air passage 6 and passing through the evaporator 3a and the evaporator 3b twice while the wind direction changes by 270 °, the heat transfer area of the evaporator 3 can be efficiently increased. It can be widely secured, thereby improving the evaporation capacity, and by reducing the bypass factor that passes through the evaporator without sufficient heat exchange, the heat exchange efficiency can be improved. .

  Further, in the curved air passage 6, the air flow paths 7a and 7b flowing in the lateral direction are changed in the upward direction by the evaporator 3a, and further changed in the air direction by the evaporator 3b. Thus, by arranging the evaporator 3 so as to smoothly change the wind direction in the curved air passage 6, the curved air passage 6 can be reduced in size.

  Further, since the air flow path 7b is longer than the air flow path 7a, the air volume tends to be reduced. Therefore, the air flow path 7b side of the evaporator 3b is arranged in one row, and the air flow path 7a side is configured in two rows. By changing the ventilation resistance, air flows into the first row portion of the evaporator 3b having a low ventilation resistance. On the other hand, air is difficult to pass through the two rows of the evaporator 3b having a large ventilation resistance, and the deviation of the air flow between the air flow path 7a and the air flow path 7b is improved, and the deviation of the capacity of the evaporator 3 is reduced. The heat exchange efficiency can be improved. Furthermore, since the surface area of the evaporator 3b on the air flow path 7a side where the air volume is relatively large is increased, it is possible to contribute to the improvement of the heat exchange efficiency of the evaporator.

  Next, the air that has passed through the curved air passage 6 and the evaporator 3 becomes 13 ° C. in the air flow path 7a and 15 ° C. in the air flow path 7b, respectively, at the inlet B111. Since the air flow path 7b always exchanges heat with the air at 27 ° C. flowing in from the inlet A108, it is warmed well and reaches 26 ° C. at the outlet B112. On the other hand, since the air passing through the air flow path 7a is on the downstream side of the air entering from the inflow port A108, it is difficult to obtain a sufficient temperature difference, and at the outflow port B112, the temperature is about 21 ° C., and a temperature deviation occurs. Air having such a temperature distribution tendency passes through the condenser 2.

  The condenser 2 is heated by the internal heat exchanger 107 by disposing the condenser 2 refrigerant outlet portion, which is the most subcooled and has the lowest refrigerant temperature, in the air flow path 7a. Therefore, it is possible to efficiently secure the degree of supercooling of the refrigerant by the low-temperature air among the fresh air, and the performance of the condenser 2 can be improved. Further, the temperature heated by the internal heat exchanger 107 by disposing the upstream portion of the refrigerant path, which is a gas phase region having a high refrigerant temperature, particularly the condenser 2 refrigerant inlet portion having the highest temperature, in the air flow path 7b. Even with high air, a sufficient temperature difference for heat exchange can be secured, and the performance of the condenser 2 can be improved.

  In this embodiment, the number of rows is changed as a method for making the ventilation resistance of the evaporator 3 non-uniform. However, the ventilation resistance may be adjusted by a fin shape, a fin pitch, or the like.

(Embodiment 2)
As shown in FIG. 2, the evaporator 8 is linearly arranged in the curved air passage 6 and forms a bypass portion 6 a below the evaporator 8. The air in the air flow path 7 a passes through the evaporator 8 twice, and the air in the air flow path 7 b mainly passes through the bypass portion 6 a at the lower part of the evaporator 8 and further passes through the upper part of the evaporator 8.

  In the above configuration, the air flow path 7b generally has a longer flow path than the air flow path 7a, so that the air volume tends to decrease. As a result, the air flow deviation between the air flow path 7a and the air flow path 7b is improved. Thereby, the bias | inclination of capability is eased in the evaporator 3, and heat exchange efficiency can be improved.

  Although the evaporator 8 has a linear shape in the present embodiment, the same effect can be achieved by using an evaporator that is refracted in the middle as shown in the first embodiment.

  By adopting the configuration of the dehumidifier of the present invention, application to a clothes dryer having a large dehumidifying / drying capacity and a built-in laundry dryer is also possible.

Schematic of the dehumidifier of Embodiment 1 of the present invention Schematic of the dehumidifier of Embodiment 2 of the present invention Schematic diagram of a conventional dehumidifier

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Condenser 3 Evaporator 3a Evaporator 3b Evaporator 4 Capillary tube (throttle means)
DESCRIPTION OF SYMBOLS 5 Refrigerant piping 6 Curved air path 6a Bypass part 8 Evaporator 102 Compressor 107 Internal heat exchanger 113 Blower fan (blower means)

Claims (8)

The main body is provided with a compressor, a condenser, a throttle means, an evaporator, and is connected in this order by refrigerant piping to form a refrigeration cycle, and the air entering the evaporator from the air inlet to be dehumidified and the An internal heat exchanger and a curved air passage are provided so that heat exchange is performed with the cooled and dehumidified air after passing through the evaporator, and the evaporator is arranged so as to block the curved air passage a plurality of times. A dehumidifier configured such that air exiting the primary flow path of the internal heat exchanger passes through the evaporator and enters the secondary flow path of the internal heat exchanger. The main body is provided with a compressor, a condenser, a throttle means, an evaporator, and is connected in this order by refrigerant piping to form a refrigeration cycle, and the air entering the evaporator from the air inlet to be dehumidified and the An internal heat exchanger and a curved air passage are provided so that heat is exchanged with the cooled and dehumidified air after passing through the evaporator, the evaporator is disposed in the curved air passage, and the evaporator The air flow resistance of the internal air exchanger is small outside the curved air passage, and the air that has exited the primary flow path of the internal heat exchanger passes through the evaporator and enters the secondary flow path of the internal heat exchanger. Dehumidifier configured. The dehumidifier according to claim 1, wherein the ventilation resistance of the evaporator is smaller on the outside than on the inside of the curved air path. 4. A dehumidifier according to claim 1 or 3, wherein a bypass part for bypassing the evaporator is provided at least once. The refrigerant path of the condenser is such that the air inlet side of the air to be dehumidified by the internal heat exchanger is the upstream side of the refrigerant, and the outlet side of the air flowing from the internal heat exchanger to the evaporator is the downstream side of the refrigerant. The dehumidifier of claim | item 1-3. The dehumidifier according to claim 1 or 3 to 5, wherein the evaporator is disposed in an inclined manner in the curved air passage, and the wind direction of the curved air passage is changed smoothly. The dehumidifier according to claim 1 or 3 to 6, wherein the refrigerant downstream side of the evaporator is positioned on the windward side by reversing the refrigerant path at a connection portion between the evaporators. The dehumidifier according to claim 1, wherein in the refrigerant path of the evaporator, heat is exchanged between the air that has passed through the condenser side of the internal heat exchanger and the downstream side of the refrigerant.

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