JP3528962B2 - Heat pump type air conditioner - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a heat pump type air conditioner.

[0002]

2. Description of the Related Art In a conventional heat pump type air conditioner, a machine room or the like has been installed due to problems such as noise.

[0003]

Therefore, there is a problem that the equipment cost becomes high. Then, it aims at providing the heat pump type | mold air conditioner which solves these problems.

[0004]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides an evaporator, a compressor capable of switching between cooling and heating operation of the evaporator, and a circulating refrigerant of the evaporator in the same main body casing. A water cooling condenser to be replaced is provided, and a damper mechanism for controlling each air volume of the outside air and the return air or the air volume of the return air blown to the evaporator is provided, and a closed chamber having a compressor and a water cooling condenser and an evaporator are provided. The air-blowing chamber is divided into the air-blowing chamber and the air-blowing chamber is arranged in a concave shape so as to surround the closed chamber for the purpose of silencing. Further, the evaporator was divided into an upwind side and a downwind side, and these two divided evaporators were connected to compressors in separate refrigeration circuits. Furthermore, one water-cooled condenser was configured to exchange heat between the circulating refrigerants in the two refrigeration circuits. Further, a cooling unit provided with a coil for exchanging the heat medium of the water-cooled condenser is provided, and the cooling unit is provided with an exhaust port for taking in indoor exhaust air and a coil blower that also serves as exhaust air. Further, the cooling unit is provided with a pump that can control the flow rate of the coil heating medium. Further, the heat transfer tube of the coil is an elliptical tube. Furthermore, a control device is provided which replaces the air flow rate signals of the plurality of indoor air outlets communicating with the main casing with numerical values and controls the supply air flow rate and the operation / stop of the compressor separately based on the total numerical values. Further, the fin tube of the evaporator was an elliptical tube.

[0005]

DETAILED DESCRIPTION OF THE INVENTION

1 to 3 show an embodiment of a heat pump type air conditioner of the present invention, which is equipped with a main body casing 1 and a cooling unit 19. In the same main body casing 1, an evaporator 5 for exchanging heat of the air with cold air or warm air with a refrigerant, a compressor 2 capable of switching between heat and cold heat exchange operation of the evaporator 5, and heat exchange with a circulating refrigerant of the evaporator 5 are carried out. The water-cooled condenser 7 is provided. Further main body casing 1
Are two refrigerating circuits 4 including a compressor 2, a switching valve, a liquid receiver, etc., capable of switching between cooling and heating, and external air B and return air C that are mixed and sent to an evaporator 5 individually. The damper mechanism 8 for controlling is provided.

The main body casing 1 is divided into a closed chamber 6 having a compressor 2, a water-cooled condenser 7 and the like, and a blower chamber 10 having an evaporator 5 and the like.
Are arranged in a concave shape so as to surround the closed chamber 6. An air blower 12 for an evaporator and a humidifier 11 are provided in the air blower chamber 10 leeward of the evaporator 5. In this way, the noise of the compressor 2 and the like is prevented in the closed chamber 6, and even if the noise slightly leaks to the outside of the closed chamber, it diffuses into the concave space of the blower chamber 10 around the closed chamber 6. The noise energy is attenuated by reflection and interference, and the sound can be surely silenced. Moreover, since the air blowing distance of the air blowing chamber 10 can be made long, the effect of silencing the noise generated in the air blowing chamber can be obtained at the same time, and the outside air B and the return air C can be sufficiently mixed to blow air to the evaporator 5 to generate air and circulating refrigerant. The heat exchange efficiency of can be improved. It should be noted that if the blower 12 is provided in a windward manner above the evaporator 5, mixing of the outside air B and the return air C can be further improved, and noise leakage into the room can be further reduced.

The main body casing 1 is formed with a return air port 13 and an outside air port 15 which communicate with the windward side of the blower chamber 10 and an air supply port 14 which communicates with the leeward side of the blower chamber 10. An outside air damper 17 for adjusting the amount of outside air to the blower chamber 10 is provided at 15, and a return air damper 18 for adjusting the amount of return air to the blower chamber 10 is provided at the return air port 13 to configure the damper mechanism 8. To do. A plurality of indoor suction ports are connected to the return air port 13 via a duct, and a plurality of indoor air outlets are connected to the air supply port 14 via a duct to air-condition the room.

The air flow rate signals of a plurality of indoor air outlets communicating with the air supply port 14 are replaced with numerical values (points), and the supply air flow rate and the operation / stop of each compressor 2 are controlled separately based on the total numerical value. The control device 20 is provided. Control device 2
0 is configured by a microcomputer or the like and controls the rotation speeds of the compressor 2 and the blower 12. The control device 20 separately issues a rotation speed command to the blower 12 to control the air volume steplessly or stepwise, and separately issues a rotation speed command to each compressor 2 to continuously circulate the circulating refrigerant flow rate. Control. For example, a sensor (not shown) is provided at each indoor outlet, and the air volume of the blower 12 is controlled to increase or decrease according to the variation of the total numerical value (points) of the air volume signal of the sensor, and the refrigerant by the compressor 2 of the refrigeration circuit 4 is controlled. Increase / decrease the flow rate. It should be noted that in the present invention, the operation of the compressor 2 includes both the operation in which the increase / decrease control of the refrigerant flow rate is not performed (simply starting / stopping) and the operation in which the increase / decrease control of the refrigerant flow rate is performed.

The evaporator 5 is divided into two parts at a predetermined ratio with a distance between the windward side and the leeward side, and the two divided evaporators 5a and 5b are connected to the compressors 2 of the separate refrigeration circuits 4 in a one-to-one correspondence. The compressors 2 and 2 of the two refrigeration circuits 4 and 4 (the leeward side divided evaporator 5
It is optimal to set the capacity ratio of b: the windward divided evaporator 5a) to 4: 6, but other ratios may be used. Normally, when switching between cooling and heating with the same evaporator, the capacity required for heating is about 60% of that required during cooling. Therefore, by setting the division ratio as described above, energy saving can be achieved by using only the windward side division evaporator 5a, that is, only the compressor 2 of the one refrigeration circuit 4 during heating.

The circulating refrigerant in the two refrigerating circuits 4 and 4 is shared by one water-cooling condenser 7 so as to exchange heat. The water-cooled condenser 7 uses various heat media such as water to exchange heat with the circulating refrigerant in the refrigeration circuit 4. However, in cold regions or the like, heat may be exchanged with brine or the like to prevent freezing. The heat medium of the water-cooled condenser 7 is the cooling unit 19
The heat is exchanged in the coil 23. The cooling unit 19 has an exhaust port 2 for taking in indoor exhaust air through a duct.
4, a coil blower 25 that also serves as an exhaust, and a pump 26 that can control the flow rate of the coil heating medium are provided. In this cooling unit 19, the heat exchange load of the coil 23 can be reduced by utilizing the exhaust heat (cool air from the room, etc.),
The effect as if using a total heat exchanger can be obtained only by the coil 23. The fin tubes of the evaporator 5 and the heat transfer tubes of the coils 23 are preferably elliptical tubes (see FIG. 3), but circular tubes may be used.

An operation example using this heat pump type air conditioner will be described. Air-conditioning / heating operation The outside air damper 17 and the return air damper 18 are opened, the outside air B from the outside air port 15 and the return air C from the return air port 13 are mixed at a predetermined ratio, and the air supply port 14 is passed through the evaporator 5. To supply air into and out of the room. When humidifying at the time of heating, the humidifier 11 is also operated to supply humidified warm air to the room to perform heating.
At this time, the two divided evaporators 5a and 5b (compressor 2,
2) By controlling the operation of one or both of them, the cooling / heating capacity can be controlled steplessly or stepwise to adjust the temperature. The outside air damper 17 can be closed to cool and heat only the return air.

Outside air cooling / ventilation operation When outside air cooling or ventilation operation is performed, the compressors 2 and 2 are stopped, the outside air damper 17 and the return air damper 18 are opened, and the outside air B and the return air C are mixed at a predetermined ratio. Air is supplied from the air outlet 14 to the room to cool or ventilate the outside air.

Dehumidification / reheat operation In the dehumidification / reheat operation, the outside air damper 17 and the return air damper 18 are opened to mix the outside air B and the return air C at a predetermined ratio, and the mixed air is divided into windward split evaporation. After dehumidifying by cooling with the circulating refrigerant of the evaporator 5a, the dehumidified air is fed to the leeward side divided evaporator 5
It is heated by the circulating refrigerant of b and air is supplied to the room from the air supply port 14 for air conditioning. At this time, since the refrigerants in the refrigeration circuits 4 and 4 exchange heat via the heat medium of the single water-cooled condenser 7, not only the heat exchange between the refrigerant and the heat medium but also the refrigerants having a larger temperature difference than that ( The heat exchange capacity can be enhanced by performing heat exchange at the temperature of the heating refrigerant-the temperature of the cooling refrigerant.

Although not shown, the outside air port 15 and the outside air damper 17 may be omitted, and an air conditioner may be configured as a damper mechanism 8 for controlling the amount of return air C blown to the evaporator 5. Good. In this case, the return air mixed with the outside air or only the return air is taken into the blower chamber 10 through the return air port 13. Further, in each of these embodiments, the evaporator 5 may be one without being divided, and the refrigeration circuit 4 (compressor 2) may also be one to constitute an air conditioner.

[0015]

According to the first aspect of the present invention, it is possible to prevent noise generated in the closed chamber from leaking out of the main casing, so that it is easy to install in a condominium or the like without providing a separate machine room or taking noise countermeasures. It can be installed in the room and the equipment cost can be reduced. The space of the main body casing can be effectively used, dead space does not occur, and the size can be reduced. According to the second aspect of the invention, one heat pump type air conditioner can perform the outside air processing cooling / heating operation, the outside air cooling operation, the ventilation operation, and the dehumidifying / reheating operation. The capacity can be adjusted simply by starting / stopping an arbitrary compressor, the control is easy, the control mechanism can be simplified, and the energy-saving operation with less trouble and less waste can be performed.
In the invention of claim 3, in the case of dehumidifying / reheating operation, heat exchange between the refrigerants having a large temperature difference (heating refrigerant temperature-cooling refrigerant temperature) can be performed in the water cooling condenser, and the heat exchange capacity of the water cooling condenser can be improved. Increase. According to the fourth aspect of the present invention, since one coil blower is also used for the exhaust blow in the cooling unit, an exhaust blower or the like is not required and the number of parts can be reduced. Energy can be saved by efficiently exchanging the heat medium of the water-cooled condenser by using the exhaust heat from the room. According to the invention of claim 5, the heat exchange capacity of the water-cooled condenser can be adjusted according to the operating condition of the evaporator, and energy saving can be achieved. According to the inventions of claims 6 and 8, since the pressure loss does not increase and the heat exchange capacity does not decrease even when used at high wind speed, a small evaporator and coil can be used, and the air conditioner can be greatly downsized. Further, since pressure loss is reduced at normal wind speed and heat exchange efficiency is improved, a small blower can be used and noise can be reduced. According to the invention of claim 7, it becomes easy to control the air volume of the blower and the capacity of the evaporator, and it is possible to prevent the air volume from being excessively narrowed, so that the air flow distribution in the room becomes uniform and there is no temperature unevenness.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is an overall simplified configuration diagram of the present invention.

FIG. 3 is a sectional view of a main part.

[Explanation of symbols]

1 Main body casing 2 compressor 4 Refrigeration circuit 5 evaporator 5a Split evaporator 5b split evaporator 6 closed room 7 Water-cooled condenser 8 damper mechanism 10 blower room 19 Cooling unit 20 Control device 23 coils 24 exhaust port 25 blower 26 pumps B outside air C return air

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) F24F 1/02 341

Claims (8)

(57) [Claims] 1. An evaporator 5 is provided in the same main body casing 1.
When a heating and cooling operation capable of switching the compressor 2 of the evaporator 5, a water-cooled condenser 7 the circulating refrigerant to the heat exchanger of the evaporator 5, the provided a sealed chamber 6 having compressors 2 and water cooled condenser 7,
A heat pump type air conditioner, characterized in that it is divided into a blower chamber 10 having an evaporator 5 and the blower chamber 10 is arranged in a concave shape so as to surround the sealed chamber 6 for the purpose of silencing. 2. The outside air B and the return air C blown to the evaporator 5
A damper mechanism 8 for controlling each air volume or the air volume of the return air C is provided.
The heat pump type air conditioner according to claim 1 , wherein the evaporator 5 is divided into an upwind side and a leeward side, and the two divided evaporators 5a and 5b are connected to the compressor 2 of each refrigeration circuit 4. 3. The heat pump type air conditioner according to claim 1 or 2, wherein one water cooling condenser 7 is configured to exchange heat between the circulating refrigerants of the two refrigeration circuits 4, 4. 4. A cooling unit 19 provided with a coil 23 for heat exchange of a heat medium of the water-cooled condenser 7 is provided, and the cooling unit 19 has an exhaust port 24 for taking in indoor exhaust air and a coil blower 25 also serving as exhaust air. The heat pump type air conditioner according to claim 1, 2 or 3, further comprising: 5. The heat pump type air conditioner according to claim 4, wherein the cooling unit 19 is provided with a pump 26 capable of controlling a coil heat medium flow rate. 6. The heat pump type air conditioner according to claim 4, wherein the heat transfer tube of the coil 23 is an elliptical tube. 7. A control device 20 for replacing the air flow rate signals of a plurality of indoor outlets communicating with the main body casing 1 with numerical values, and controlling the supply air flow rate and the operation / stop of the compressor 2 separately based on the total numerical values. Claims 1, 2, 3, 4,
The heat pump type air conditioner according to 5 or 6. 8. A heat pump type air conditioner according to claim 1, wherein the fin tube of the evaporator 5 is an elliptical tube.