JP2008304150A - Heat pump type air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat pump type air conditioner capable of quickly draining drain water dripped in a lower casing to an external part without staying in heating operation in winter. <P>SOLUTION: This heat pump type air conditioner has whole heat exchangers 4 straddling an air supply flow passage 2 and an exhaust flow passage 3 between the air supply flow passage 2 having an outside air introducing port 2a and an air supply port 2b to an air-conditioning object chamber and the exhaust flow passage 3 having an air circulating port 3a from the air-conditioning object chamber and an exhaust port 3b to the external part, and performs cooling operation of the air-conditioning object chamber by making a refrigerant from a compressor 12 flow in order of a first exchanger 6 and a second heat exchanger 10 to the first heat exchanger 6 arranged on the downstream side of the air supply flow passage 2 of the whole heat exchangers 4 and the second heat exchanger 10 arranged on the downstream side of the exhaust flow passage 3, and is provided with the lower casing 23 arranged under the second heat exchanger 10, and a tubular coil part 15 storing a refrigerant liquid condensed by the first heat exchanger 6 in heating operation in the lower casing 23 and warming up the inside of the lower casing 23 by using remaining heat of the refrigerant liquid. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a heat pump type air conditioner capable of switching between cooling and heating by operating a refrigerant circuit, and in particular, retaining drain water dripped in a lower casing during a heating operation in winter. The present invention relates to a heat pump type air conditioner that can be quickly discharged to the outside.

Conventionally, in an outside air processing type air conditioner that air-conditions introduced outside air to the air-conditioned room and discharges return air from the air-conditioned room to the outside, the introduced outside air is air-conditioned to the air-conditioned room. A total heat exchanger straddling these two flow paths is provided between the air supply flow path to be sent and the exhaust flow path for discharging the return air from the air-conditioned chamber to the outside. The remaining heat energy in the return air is recovered by heat exchange with the heat exchanger, and one of the heat exchangers of the heat pump circuit is arranged in each of the two flow paths to further recover waste heat, thereby saving energy. This is widely known (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 7-310964.

  By the way, in an air conditioner as shown in Patent Document 1, water droplets (hereinafter referred to as “drain water”) adhere to the surface of the heat exchanger provided in the exhaust passage during heating operation, and this drops. For this reason, the lower casing which receives drain water is provided in the lower side of a heat exchanger, and after receiving drain water with a lower casing, it has the structure discharged | emitted outside. However, the drain water dropped on the lower casing may freeze in the winter and stay in the lower part of the heat exchanger, which has been a problem.

  Therefore, in order to provide a heat pump type air conditioner that can quickly drain the drain water dropped on the lower casing to the outside without staying in the lower casing during the heating operation in winter. A technical problem arises, and the present invention aims to solve this problem.

  The present invention has been proposed to achieve the above object, and the invention according to claim 1 is characterized in that an air supply passage having an outside air introduction port and an air supply port to the air-conditioned room, A total heat exchanger is provided between the return air port and the exhaust channel having an exhaust port to the outside. The total heat exchanger straddles the supply channel and the exhaust channel, and is provided downstream of the total heat exchanger in the supply channel. For the first heat exchanger provided and the second heat exchanger provided downstream of the total heat exchanger in the exhaust passage, the refrigerant from the compressor is exchanged with the first heat exchanger and the second heat exchanger. In a heat pump air conditioner configured to perform air conditioning by switching between cooling operation and heating operation with respect to the air-conditioned room by circulating in the order of the heat exchangers, heating operation is performed on the lower tube of the second heat exchanger. Sometimes the refrigerant liquid condensed in the first heat exchanger is stored and the residual heat of the refrigerant liquid is stored. A heat pump type air conditioner having a function of using and warming a lower casing is provided.

According to this structure, the change of the refrigerant | coolant amount in each heat exchanger at the time of air_conditionaing | cooling operation / heating operation can be absorbed by storing a part of refrigerant liquid in a tubular coil part. Moreover, since the refrigerant | coolant liquid in a tubular coil part is normally warmed at about 20-25 degreeC, the outer surface of a tubular coil part is also warmed by the residual heat of this refrigerant | coolant liquid. Therefore, the drain water dropped on the lower casing during the heating operation can be quickly discharged to the outside without being heated and frozen by the tubular coil portion.

  According to the first aspect of the present invention, the drain water dropped on the lower casing during the heating operation is smoothly discharged to the outside without freezing and staying. In addition, a change in the amount of refrigerant in each heat exchanger during cooling operation / heating operation can be absorbed by storing a part of the refrigerant liquid in the tube-shaped coil part, so a receiver that absorbs the change in the refrigerant amount Is no longer necessary.

  In order to achieve the object of providing a heat pump type air conditioner that can quickly discharge the drain water dripped onto the lower casing to the outside during the heating operation in winter, Between the air supply passage having the air supply port to the air-conditioned room and the exhaust flow passage having the return air outlet from the air-conditioned room and the exhaust outlet to the outside. A first heat exchanger provided on the downstream side of the total heat exchanger in the air supply flow path, and a second heat exchange provided on the downstream side of the total heat exchanger in the exhaust flow path. The refrigerant from the compressor is circulated in the order of the first heat exchanger and the second heat exchanger or vice versa, and the air conditioning is performed by switching between the cooling operation and the heating operation for the air-conditioned room. In the heat pump type air conditioner configured, the second heat This was realized by making the lower tube of the exchanger a heat pump type air conditioner having a function of storing the refrigerant liquid condensed in the first heat exchanger during heating operation and warming the lower casing using the residual heat of the refrigerant liquid.

  Hereinafter, the heat pump type air conditioner of the present invention will be described with reference to preferred embodiments.

  FIG. 1 is a system diagram showing a configuration of a heat pump type air conditioner according to an embodiment of the present invention. In FIG. 1, in a casing 1, an air supply passage 2 extending from an outside air introduction port 2 a to an air supply port 2 b to an air-conditioned room (not shown), and a return air port 3 a for introducing return air from the air-conditioned room. And an exhaust passage 3 extending from the exhaust port 3b to the outside, and a total heat exchanger 4 straddling the two passages is provided between the supply passage 2 and the exhaust passage 3. Yes.

  In the air supply flow path 2, a filter 5, the total heat exchanger 4, the first heat exchanger 6, a humidifier 7, and a blower 8 are provided in order from the outside air port 2 a toward the air supply port 2 b. The filter 5 has a two-stage configuration, for example, a pre-filter 5a and a medium performance filter 5b.

  On the other hand, the exhaust passage 3 is provided with a filter 9, the total heat exchanger 4, the second heat exchanger 10, and the blower 11 in order from the return air port 3 a to the exhaust port 3 b.

  In addition, a compressor 12 of a refrigerant circuit is provided between the filter 9 and the total heat exchanger 4 in the exhaust flow path 3. The refrigerant from the compressor 12 is supplied by switching the first heat exchanger 6 and the second heat exchanger 10 by a four-way valve 13 in this order or vice versa, and the compressor is connected via an accumulator 14. The configuration is returned to 12. That is, the cooling operation and the heating operation can be switched by switching the four-way valve 13.

  Further, a tube-shaped coil portion 15 also serving as a receiver is provided in the lower portion of the second heat exchanger 10 in the exhaust flow path 3. The tubular coil portion 15 forms a refrigerant liquid passage through which the refrigerant liquid condensed in the first heat exchanger 6 is sent to the second heat exchanger 10 during the heating operation. Further, a part of the refrigerant liquid can be stored inside the tubular coil portion 15, and changes in the amount of refrigerant in each of the heat exchangers 6 and 10 during the cooling operation / heating operation are represented by the tubular coil portion 15. It can be absorbed by storing the refrigerant liquid inside.

  A lower casing 23 that receives the drain water that adheres to the surface of the second heat exchanger 10 and drops is provided immediately below the tubular coil portion 15. The inside of the lower casing 23 is warmed by the residual heat of the refrigerant liquid stored in the tube-shaped coil portion 15 so that the drain water can be prevented from freezing in the lower casing 23 in winter. .

  In FIG. 1, reference numerals 19 and 20 denote expansion valves for the first heat exchanger 6 and the second heat exchanger 10, respectively, and 21 and 22 denote the first heat exchanger 6 and the second heat exchanger, respectively. A check valve for 10 is shown. In addition, the expansion valve 20 and the check valve 22 for the second heat exchanger 10 are configured so that the refrigerant liquid sent out from the compressor 12 during the cooling operation does not pass through the tubular coil portion 15 and enters the second heat exchanger 10. A bypass passage means 24 is formed which is directly sent and further sent from the second heat exchanger 10 to the first heat exchanger 6 through the check valve 22.

  Next, the effect | action by the heat pump type air conditioning apparatus of the structure mentioned above is demonstrated. First, the refrigerant flow during the cooling operation by switching the four-way valve 13 and the refrigerant flow during the heating operation will be described.

  During the cooling operation, as indicated by a solid arrow in FIG. 1, the refrigerant from the compressor 12 is sent to the second heat exchanger 10 that is the exhaust side heat exchanger via the four-way valve 13, and the exhaust passage 3 It is condensed by heat exchange with air flowing through. The refrigerant here does not pass through the tubular coil portion 15, but is sent from the second heat exchanger 10 through the check valve 22 to the first heat exchanger 6, which is a supply-side heat exchanger. Further, after the air that has been evaporated in the first heat exchanger 6 and flows through the air supply passage 2 is cooled, the air is sent to the accumulator 14, where it is gas-liquid separated by the accumulator 14. Returned. The air cooled by the first heat exchanger 6 is sent to the air-conditioned room.

  On the other hand, during the heating operation, as indicated by broken line arrows in FIG. 1, the refrigerant from the compressor 12 is sent to the first heat exchanger 6 through the four-way valve 13 and flows through the air supply passage 2. The air is condensed by heat exchange with the air to heat the air in the air supply passage 2, and the condensed refrigerant is sent to the second heat exchanger 10.

  The refrigerant sent to the second exchanger 10 passes through the tubular coil portion 15, and once stored in the tubular coil portion 15, enters the second heat exchanger 10. Then, it is evaporated in the second heat exchanger 10 to take away the heat of the air flowing through the exhaust passage 3, and is then separated into gas and liquid by the accumulator 14 and returned to the compressor 12. In addition, the air heated with the 1st heat exchanger 6 is sent to an air-conditioned room.

  Further, during the heating operation, the refrigerant liquid flowing in the tubular coil portion 15 is normally warmed to about 20 to 25 ° C., so that the outer surface of the tubular coil portion 15 is also warmed by the residual heat of the refrigerant liquid. Therefore, the drain water dripped in the lower casing 23 during the heating operation is warmed by the tubular coil portion 15 and discharged outside without freezing.

  Next, the effect | action of the whole heat pump type air conditioning apparatus is demonstrated. During the heating and warming operation in winter, the air from the outside air inlet 2a flows through the total heat exchanger 4 through the filter 5, exchanges heat with the air in the exhaust passage 3, and then the first heat exchanger 6 And sent to the humidifier 7. During the heating operation, the first heat exchanger 6 acts as a condenser, so that the air in the air supply passage 2 is heated to a required temperature in the first heat exchanger 6 and is supplied by driving the blower 8. The air is sent from the air inlet 2b and sent to the air-conditioned room by air supply means such as a duct (not shown) connected to the air inlet 2b.

The return air returned from the air-conditioned room by the air supply means such as a duct flows into the exhaust passage 3 from the return air port 3a, passes through the filter 9, and is sent to the total heat exchanger 4 to be supplied. Heat is exchanged with the air in the air flow path 2, the second heat exchanger 10 cools the refrigerant by the heat of evaporation of the refrigerant, and the fan 11 is driven to discharge the air from the exhaust port 3 b.

  On the other hand, during the cold operation in summer, the air from the outside air inlet 2a flows through the total heat exchanger 4 through the filter 5 and exchanges heat with the air in the exhaust passage 3, and then the first heat exchanger. 6 is sent. During the cooling operation, the first heat exchanger 6 acts as an evaporator, so that the air in the air supply passage 2 is cooled to a required temperature in the first heat exchanger 6 and is supplied by driving the blower 8. The air is sent out from the port 2b and sent to the air-conditioned room by air feeding means such as a duct (not shown) connected to the air supply port 2b.

  The return air returned from the air-conditioned room by the air supply means such as a duct flows into the exhaust passage 3 from the return air port 3a, passes through the filter 9, and is sent to the total heat exchanger 4 to be supplied. Heat exchange with the air in the air flow path 2 is performed by the heat of condensation of the refrigerant in the second heat exchanger 10, and the air is discharged to the outside through the exhaust port 3 b by driving the blower 11.

  Therefore, in the heat pump type air conditioner according to the present embodiment, changes in the amount of refrigerant in each of the heat exchangers 6 and 10 during the cooling operation and the heating operation are absorbed by storing the refrigerant liquid in the tubular coil portion 15. This eliminates the need for a receiver for absorbing changes in the refrigerant amount.

  Moreover, the drain water dripped in the lower casing 23 at the time of heating operation is warmed by the tube-shaped coil part 15, and is quickly discharged | emitted outside without freezing.

  It should be noted that the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

The system diagram which shows the structure of the heat pump type air conditioning apparatus which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Casing 2 Air supply flow path 2a Outside air introduction port 2b Air supply port 3 Exhaust flow channel 3a Return air port 3b Exhaust port 4 Total heat exchanger 5 Filter 6 1st heat exchanger 7 Humidifier 8 Blower 9 Filter 10 2nd heat exchange 11 Blower 12 Compressor 13 Four-way valve 14 Accumulator 15 Tubular coil portion 19 Expansion valve 20 Expansion valve 21 Check valve 22 Check valve 23 Lower casing 24 Bypass flow path means

Claims (1)

These air supply passages are provided between an air supply passage having an outside air introduction port and an air supply port to the air-conditioned room, and an exhaust passage having a return air port from the air-conditioned room and an exhaust port to the outside. A first heat exchanger provided on the downstream side of the total heat exchanger in the air supply flow path; and a first heat exchanger provided on the downstream side of the total heat exchanger in the exhaust flow path. The refrigerant from the compressor is circulated in the order of the first heat exchanger and the second heat exchanger or vice versa for the two heat exchangers to switch between the cooling operation and the heating operation with respect to the air-conditioned room, thereby adjusting the air conditioning. In a heat pump type air conditioner configured to perform,
Among the tubes constituting the second heat exchanger, several lower tubes store the refrigerant liquid condensed in the first heat exchanger during heating operation, and warm the lower casing using the residual heat of the refrigerant liquid A heat pump type air conditioner characterized by comprising:

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