JP6942082B2 - Integrated air conditioner - Google Patents

Description

The present invention relates to an integrated air conditioner, and more particularly to an integrated air conditioner in which the unit is used as a cold air conditioner or a dehumidifier in a living room.

When it is not possible to install a separate type air conditioner because it is difficult to connect the refrigerant pipes due to the room layout, etc., or when you want to cool down easily and spotted with cold air. An integrated cold air conditioner with a built-in small-capacity compressor and a refrigeration circuit is used. In this cold air blower, the cold air cooled by the evaporator was blown out from the front outlet toward the user, and at the same time, the warm air exhausted by the condenser was blown out from the back. Such a cold air conditioner is also used as a dehumidifier for the purpose of drying laundry except in the summer.

7 and 8 are schematic cross-sectional views of a plane of a conventional example, wherein the housing has a cold air suction port a, a cold air outlet b, a hot air suction port c, and a hot air outlet d. A compressor, an expansion valve, an evaporator e, a cold air fan f, a condenser g, and a hot air fan h are provided in the housing, and the cold air suction port a and the evaporator e, a cold air fan f, and a cold air fan h are provided. A cold air blowing path i is formed by communicating with the air outlet b, and the hot air suction port c and the condenser g, a hot air fan h, and a hot air outlet d are communicated with each other to form a hot air blowing path i. A path j is formed, the cold air blowing path i and the hot air blowing path j are arranged adjacent to each other via the partition wall k, and the cold air blowing path i and the hot air blowing path j are arranged in the vicinity of the cold air outlet b. A bypass portion l for communicating with the cold air outlet b is provided in the vicinity of the cold air outlet b. At the same time, the switching means m blows out the cold air cooled by the evaporator e from the cold air outlet b, and at the same time, dissipates heat from the hot air outlet d with the condenser g and discharges it with warm air. In the cold air mode for heating (see FIG. 7), the cold air outlet b is closed, the cold air cooled and dehumidified by the evaporator e is sent to the condenser g to heat it, and the dry air is blown from the hot air outlet d. A control unit for selecting a blowing drying mode (see FIG. 7) is provided.

As a result, in the summer, as shown in FIG. 7, it is used as a cold air conditioner by being exposed to the cold air drawn from the cold air outlet b provided on the front surface. When not used as a cold air blower, as shown in FIG. 7, the air sucked from the cold air suction port a is cooled by the evaporator e, and the dry air from which the moisture in the air has been removed by the dew condensation on the evaporator e is condensed into the condenser g. It is used as a dryer or a dehumidifier by blowing dry air at a temperature substantially the same as room temperature from the hot air outlet d provided on the back surface. (See, for example, Patent Document 1)

Japanese Patent No. 4489571

In such a conventional integrated air conditioner, when used in a relatively small room where the room temperature is particularly high in summer, heat accumulates in the room as the operation is continued, and the temperature of the compressor or refrigeration circuit becomes overheated. When the limit temperature (about 130 ° C. at the temperature of the compressor) is approached, the overload relay provided in the compressor is activated to prevent damage to the compressor, shutting off the power supply of the compressor and stopping the operation. The overload relay is made of bimetal, and the temperature needs to drop to about 80 ° C. to recover after operation. However, it is not only impossible to restart the compressor operation for about 20 minutes until the bimetal recovers, but also frequently When the overload relay was activated, the life of the compressor was shortened. Therefore, the control unit detects the temperature of the condenser and the vicinity of the condenser while continuing the cold air mode, stops the compressor for a short time in advance before the overload relay operates, and operates only the blower fan. By lowering the temperature of the compressor and refrigeration circuit, damage to the compressor was prevented and it was prevented from causing discomfort to the user due to a long stop, but the compressor stopped in cold air mode. In this state, the hot air blown from the cold air outlet continues to cause discomfort to the user, and further improvement in performance has been required.

In order to solve the above-mentioned problems, in particular, the configuration is provided with a cold air suction port, a cold air outlet, a hot air suction port, and a hot air outlet in the housing, and a compressor and expansion are provided in the housing. It has a valve, an evaporator, a fan for cold air, a condenser, and a fan for hot air, and the compressor and the condenser, an expansion valve, and an evaporator are sequentially connected by a refrigerant pipe to form a refrigeration circuit, and the cold air is formed. The suction port for cold air and the evaporator, the fan for cold air, and the air outlet for cold air are communicated to form a blower path for cold air. A hot air blowing path is formed by communicating with each other, and the cold air blowing path and the hot air blowing path are arranged adjacent to each other via a partition wall, and the cold air blowing path and the hot air blowing path are arranged in the vicinity of the cold air outlet. The bypass portion is provided with a bypass portion that communicates with the above, and the switching means opens a cold air outlet and closes between a cold air blower path and a hot air blower path to close the cold air outlet. A cold air mode that blows cold air from the air outlet and a drying mode that closes the cold air outlet and blows dry air from the hot air outlet by communicating the cold air air passage and the hot air air passage. In an integrated air conditioner equipped with a control unit to select, a heat exchange sensor that detects the temperature of the compressor and the refrigerant pipe near the compressor, and the cold air fan and the hot air fan are multistaged. When the heat exchange temperature X detected by the heat exchange sensor detects a third predetermined temperature X3 or higher during the operation in the cold air mode, the rotation speed F of the blower motor is set to the third. 2 When the heat exchange temperature X is set to a predetermined rotation speed F2 and a second predetermined temperature X2 or higher in which the heat exchange temperature X is larger than the third predetermined temperature X3 is detected, the rotation speed F of the blower motor is larger than the second predetermined rotation speed F2. When the first predetermined rotation speed F1 is set and the first predetermined temperature X1 or higher in which the heat exchange temperature X is larger than the second predetermined temperature X2 is detected, the blowing path is switched from the cold air mode to the drying mode by the switching means. It is provided with a temperature rise protection unit.

According to the present invention, when the heat exchange temperature detected by the heat exchange sensor during cold air mode operation detects an overheated state, the air passage is switched from the cold air mode to the dry mode by the switching means, so that the cold air cooled by the evaporator is cooled. The refrigeration circuit can be cooled efficiently by guiding the freezing circuit to the condenser. In addition, it is possible to prevent unpleasant air blowing from the cold air outlet when the compressor is stopped. Further, by cooling the condenser without stopping the compressor, the condenser can be positively cooled by the cold air cooled by the evaporator, and the time that causes discomfort to the user is shortened.

The perspective view at the time of the cold air mode operation of one Example of this invention. An enlarged sectional view of a main part in the same cold air mode operation. An enlarged cross-sectional view of a main part in the same drying mode operation. The block diagram of the refrigeration circuit. The block diagram of the control circuit. Explanatory drawing which shows the same heat exchange temperature and operation of each part. The schematic cross-sectional view which shows the blast of the cold air mode of a conventional example. The schematic cross-sectional view which shows the blast of the dry mode of a conventional example.

An embodiment of the air conditioner of the present invention will be described with reference to the drawings of FIGS. 1 to 6. Reference numeral 1 denotes a housing of an air conditioner, which is composed of a right frame 3 and a left frame 4 that engage with the bottom plate 2 at the center of the front surface, the upper surface, and the back surface. An evaporator 5, a condenser 6, a compressor 7, and an expansion valve 40 of a refrigerating circuit are provided in the housing 1, a cold air fan 8 is provided on the downstream side of the evaporator 5, and a cold air fan 8 is provided on the downstream side of the condenser 6. Is provided with a hot air fan 9, and a blower motor 10 that rotates the cold air fan 8 and the hot air fan 9 on the same axis is fixed to the cold air fan 8 side of the partition wall 11.

The right frame 3 is provided with a cold air suction port 12 from the center to the upper part of the right side surface, and the cold air suction port 12 is covered with a filter 13 for removing dust in the suction air. A tank hole 15 for attaching / detaching the drain tank 14 is provided below the cold air suction port 12. When the drain tank 14 is mounted, the outer surface of the drain tank 14 is formed on the same surface as the outer surface of the right frame 3. A recess 16 for a handle during transportation is integrally formed above the cold air suction port 12.

The left frame 4 is provided with a hot air suction port 17 from the center to the upper part of the left side surface, and the hot air suction port 17 is covered with a filter 13 like the cold air suction port 12. Further, a recess 16 having the same shape is integrally formed at a position facing the handle recess 16 of the right frame 3.

A front panel 18 is provided above the mating surface of the right frame 3 and the left frame 4 at the center of the lower part of the front surface, and a cold air outlet 19 is provided above the front panel 18. The cold air outlet 19 is provided with a pair of vertical louvers 20 on the left and right that adjust the wind direction of the cold air in the left-right direction and close the cold air outlet 19 when stopped or in the dry mode operation, and the vertical louvers 20 are provided above and below the cold air. A large number of lateral louvers 21 for adjusting the wind direction in the direction are attached.

On the right side of the partition wall 11, a cold air suction port 12, an evaporator 5, a cold air fan 8, and a cold air outlet 19 are communicated with each other to form a cold air ventilation path 22, and on the left side of the partition wall 11. The hot air suction port 17 and the condenser 6, the hot air fan 9, and the hot air outlet 23 communicate with each other to form a hot air blowing path 24.
The cold air blowing path 22 on the right side of the cold air outlet 19 is provided with a bypass portion 25 communicating with the hot air blowing path 24 between the condenser 6 and the hot air suction port 17, and is provided with a bypass portion 25 for communicating with the hot air blowing path 24. Is guided to the condenser 6 and heated.

In the vertical louver 20, two inner and outer blades are integrally formed substantially in parallel, a horizontal louver 21 is rotatably provided between the two blades, and a large number of horizontal louvers 21 are connected to each other. By being connected by (not shown), the angle of each lateral louver 21 is made constant.

Further, a damper 26 is provided inside the left side of the vertical louver 20, the vertical louver 20 is automatically closed by the louver motor 27 when the operation is stopped in the drying mode, and the damper 26 is vertically linked with the vertical louver 20. By connecting to the inner blades of the louver 20 and doubly closing the cold air outlet 19, the outer surface of the vertical louver 20 is prevented from condensing due to cold air.
The louver motor 27 has a mechanism for rotating the axes of the two vertical louvers 20 and the damper 26 at the same time, and uses a DC step motor. By opening and closing the bypass portion 25 with the damper 26, it is possible to control the communication and blocking of the cold air blowing path 22 and the hot air blowing path 24. The bypass portion 25 is opened and closed by operating the vertical louver 20, the damper 26, and the louver motor 27 as switching means, and at the same time, the cold air outlet 19 is doubly closed during operation in the cold air mode.

Reference numeral 28 denotes an operation unit provided on the front side of the upper surface of the housing 1, which includes an operation switch 29 for stopping operation, a mode changeover switch 30 for switching between cold air mode operation and dehumidification mode operation, a timer switch 31, and the like. It is provided with a large number of lamps 32 for displaying a status.

The hot air outlet 23 is located from the rear side to the back surface of the upper surface of the housing 1, and the hot air blowing direction is switched between the upward direction and the rear direction by switching the exhaust louver 33. The exhaust louver 33 covers the hot air outlet 23 on the upper surface side on the same surface as the upper surface, and from the rear exhaust position where the warm air is exhausted rearward, the rotating shafts provided on the left and right inside the hot air outlet 23. By manually rotating the exhaust louver 33 upward by about 90 degrees with (not shown) as a fulcrum, the exhaust louver 33 covers the hot air outlet 23 on the back side and warm air upward while slightly protruding from the back. Exhaust.

The evaporator 5 and the condenser 6 are fin tube type heat exchangers in which a copper tube penetrates a large number of aluminum fins having good thermal conductivity. A compressor 7 is provided on the bottom plate 2, and the compressor 7, the condenser 6, the expansion valve 40, and the evaporator 5 are sequentially communicated with each other by a refrigerant pipe to form a freezing circuit. A drain pan (not shown) is provided below the evaporator 5, and the condensed water generated in the evaporator 5 is collected by the drain pan and stored in the drain tank 14.

Reference numeral 34 denotes a control unit, in which switches such as the operation switch 29 and the mode changeover switch 30 are connected to the temperature sensor 35, the humidity sensor 36, the heat exchange sensor 37, etc. on the input side, and the blower motor 10 and compression are connected to the output side. The machine 7, the louver motor 27, the lamp 32, and the like are connected, and the operation mode and the amount of air blown are changed according to the switch operation on the operation unit 28 and the signals of the sensors 35, 36, and 37. The heat exchange sensor 37 can estimate the temperature of the compressor 7 by detecting the temperature of the condenser 6 and the refrigerant pipe in the vicinity of the condenser 6 (heat exchange temperature X). As a result, when the operation is performed in the cold air mode, the room temperature rises excessively, overload operation occurs, the overload relay 38 provided in the compressor 7 operates, and the power supply of the compressor is cut off for a long time. The control unit 34 is provided with an overheating protection unit 39 so that the operation is not stopped. The expansion valve 40 is an electronic expansion valve, and the opening degree is adjusted by the control unit 34 according to the rotation speed of the compressor 7, the temperature of the heat exchange sensor 37, the refrigeration circuit, and the like.

The overload relay 38 is a safety device included in the compressor 7 to prevent damage to the compressor 7 when the compressor 7 is overheated and the limit temperature (about 130 ° C. at the temperature of the compressor 7) approaches. The power supply to the machine 7 itself is cut off and the operation of the compressor 7 is stopped. Further, the overload relay 38 is made of bimetal, and the temperature needs to be lowered to about 80 ° C. to recover after operation, but the operation of the compressor 7 cannot be restarted for about 20 minutes until the bimetal recovers. Instead, if the overload relay 38 is activated frequently, the life of the compressor 7 is shortened.

Explaining the air flow path during the cold air mode operation, the cold air air outlet 19 is opened by the vertical louver 20, and the damper 26 interlocking at the same time closes the bypass portion 25 to open the cold air air flow path 22 and the hot air air flow path 24. To separate. As a result, the air sucked from the cold air suction port 12 is dust-removed by the filter 13, cooled by the low-temperature evaporator 5, passes through the cold air fan 8, and is passed through the cold air outlet 19 to the vertical louver 20. And the cold air is guided and blown out by the horizontal louver 21. At the same time, the air sucked from the hot air suction port 17 is dust-removed by the filter 13, heated by the high-temperature condenser 6, passed through the hot air fan 9, and used as warm air from the hot air outlet 23. Exhaust heat is performed.

Next, to explain the ventilation path during the drying mode operation, the cold air outlet 19 is closed by the vertical louver 20, and the damper 26 interlocking at the same time opens the bypass portion 25 to open the cold air ventilation path 22 and the warm air. It communicates with the ventilation path 24. As a result, the air sucked from the cold air suction port 12 is dust-removed by the filter 13, cooled by the low-temperature evaporator 5 to remove the moisture in the air, and then passed through the cold air fan 8. , The air outlet 19 for cold air is directed, but since the air outlet 19 for cold air is blocked by the vertical louver 20 and the damper 26, the cold air is sent to the condenser 6 through the bypass portion 25 and heated by the condenser 6. After that, dry air is blown out from the hot air outlet 23 through the hot air fan 9. This dry air is used to dry the laundry and dehumidify the room.

Next, the operation of the overheat protection unit 39 during the cold air mode operation will be described with reference to FIG. The cold air mode operation is operated by the ventilation path described above. If the operation is continued for a long time in a state where the room temperature is high, the temperature of the compressor 7 and the entire refrigeration circuit rises. Therefore, the temperature of the pipes near the condenser 6 and 6 near the condenser is detected (heat exchange temperature), and the temperature of the compressor 7 is lowered in advance by the overheating protection unit 39 so that the overload relay 38 does not operate. Operate.

If the room temperature is high and the cold air mode operation is continued in a small room, cool air can be obtained from the cold air outlet 19, but hot air is discharged from the hot air outlet 23, so that the room is indoors. When ventilation is not performed, the room temperature gradually rises, and when the heat exchange temperature X detects 60 ° C. (third predetermined temperature X3) or higher, the rotation speed F of the blower motor 10 that normally rotates at around 700 rpm is increased. The temperature rise to 800 rpm (second predetermined rotation speed F2) promotes the exhaust heat from the condenser 6 to suppress the rise in the heat exchange temperature X. In this state, when the heat exchange temperature X further rises and detects 62 ° C. (second predetermined temperature X2) or higher, the rotation speed F of the blower motor 10 rises to the maximum rotation speed of 900 rpm (first predetermined rotation speed F1). By doing so, the heat exchange temperature X is suppressed from rising by further promoting the exhaust heat from the condenser 6.

When the heat exchange temperature X further rises and detects 64 ° C. (first predetermined temperature X1) or higher, the damper 26 is operated to switch the air flow path to the drying mode side, so that the cold air that has passed through the evaporator 5 is condensed. By rapidly cooling the vessel 6, the temperature of the compressor 7 and the condenser 6 can be lowered in a short time.

Next, when the heat exchange temperature X drops to 58 ° C. (fourth predetermined temperature X4) or less, the rotation speed F of the blower motor 10 is returned to 800 rpm (second predetermined rotation speed F2) to continue the operation. When the heat exchange temperature X is detected to be 55 ° C. (fifth predetermined temperature X5) or less, the damper 26 is operated to return the air flow path from the dry mode to the cold air mode and continue the operation.

In this way, when the heat exchange temperature X detected by the heat exchange sensor 37 during the cold air mode operation detects an overheated state, the evaporator 5 cools the air by switching the air passage from the cold air mode to the drying mode by the switching means. By guiding the cold air to the condenser 6, the refrigeration circuit can be cooled efficiently. Further, it is possible to prevent unpleasant air blowing from the cold air outlet 19 when the compressor 7 is stopped. Further, by cooling the compressor 6 without stopping the compressor 7, the condenser 6 can be positively cooled by the cold air cooled by the evaporator 5, and the time required for overheat protection of the compressor 7 is shortened. As a result, the time that causes discomfort to the user is shortened.

Although embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof. For example, the heat exchange temperature X and the rotation speed F of the blower motor 10 may be arbitrarily different depending on the characteristics of the model.

1 Housing 5 Evaporator 6 Condenser 7 Compressor 8 Cold air fan 9 Hot air fan 12 Cold air suction port 17 Hot air suction port 19 Cold air outlet 20 Vertical louver (switching means)
22 Cold air blower path 23 Warm air outlet 24 Warm air blower path 25 Bypass 26 Damper (switching means)
34 Control unit 37 Heat exchange sensor 38 Overload relay 39 Overheating protection unit

Claims (2)

The housing has a cold air inlet, a cold air outlet, a hot air inlet, and a hot air outlet.
It has a compressor, an expansion valve, an evaporator, a fan for cold air, a condenser, and a fan for hot air in the housing.
The compressor, the condenser, the expansion valve, and the evaporator are sequentially connected by a refrigerant pipe to form a freezing circuit.
The cold air suction port and the evaporator, the cold air fan, and the cold air outlet are communicated with each other to form a cold air blowing path.
The hot air suction port and the condenser, the hot air fan, and the hot air outlet are communicated with each other to form a hot air blowing path.
The cold air blowing path and the hot air blowing path are arranged adjacent to each other via a partition wall.
A bypass section for communicating the cold air air passage and the hot air air passage is provided in the vicinity of the cold air outlet.
The bypass portion has a switching means and has a switching means.
The switching means has a cold air mode in which cold air is blown out from the cold air outlet by opening the cold air outlet and closing between the cold air air passage and the hot air air passage.
An integrated air equipped with a control unit that closes the cold air outlet and selects a drying mode in which dry air is blown out from the hot air outlet by communicating the cold air air passage and the hot air air passage. In the harmony machine
A heat exchange sensor that detects the temperature of the condenser and the refrigerant piping near the condenser,
A blower motor that rotates the cold air fan and the hot air fan at a multi-stage rotation speed F is provided.
When the heat exchange temperature X detected by the heat exchange sensor during the cold air mode operation detects a third predetermined temperature X3 or higher, the rotation speed F of the blower motor is set to the second predetermined rotation speed F2.
When the second predetermined temperature X2 or higher in which the heat exchange temperature X is larger than the third predetermined temperature X3 is detected, the rotation speed F of the blower motor is set to the first predetermined rotation speed F1 larger than the second predetermined rotation speed F2. ,
When the first predetermined temperature X1 or higher in which the heat exchange temperature X is larger than the second predetermined temperature X2 is detected, the overheating protection unit for switching the blowing path from the cold air mode to the drying mode by the switching means is provided. An integrated air conditioner that features it. After switching to the drying mode, the overheat protection unit detects a fourth predetermined temperature X4 or less in which the heat exchange temperature X is lower than the first predetermined temperature X1 and higher than the fifth predetermined temperature X5. At that time, the rotation speed F of the blower motor is returned to the second predetermined rotation speed F2 to continue the operation, and when the heat exchange temperature X detects the fifth predetermined temperature X5 or less, the blower path is changed by the switching means. The integrated air conditioner according to claim 1 , wherein the operation is continued by returning from the drying mode to the cold air mode.

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