JP2822769B2 - Heat pump system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pump system having a function of drying clothes and the like, in addition to a room heating and cooling system.

[0002]

2. Description of the Related Art An example of this type of heat pump system having a drying function is disclosed in Japanese Patent Application Laid-Open No. 1-230963. FIG. 7 shows a piping diagram of the conventional multi-system, which constitutes a multifunctional heat pump system having an air-conditioning function, a drying function, a hot-water supply heating function, and a bathtub hot water reheating function.

In FIG. 7, a compressor, an outdoor heat exchanger and the like are housed in an outdoor unit 21. And the outdoor unit 21
Has three indoor units 22 to 24, a hot water tank 25, and a bathtub 2
6 and a reheating unit 28 having a bath heating heat exchanger 27 for heating hot and cold water.

Further, a drying unit 29 having a drying heat exchanger connected in series to the bath heating heat exchanger 27 is arranged on the ceiling of the bathroom. This drying unit 29 may be provided on the ceiling of the dressing room adjacent to the bathroom.
The room where the drying unit 29 is disposed is referred to as a drying room 3
Description will be made assuming 0.

[0005] The drying chamber 30 is appropriately provided with a hanging pole (not shown) for hanging clothes so as to be used for drying wet clothes and the like after washing.
In other words, the living space can be used more effectively by further using the bathroom or the undressing room, which is normally unused except during bathing, as a drying room for clothes.

[0006] The compressor of the outdoor unit 21 is operated with a compression capacity corresponding to the total load of each use side heat exchanger by inverter frequency control. Further, a heat pump operation control device 3 for circulating a refrigerant to each use side device which requires an operation while monitoring the entire multifunctional heat pump system 3
1 is provided inside the outdoor unit 21.

In the indoor air-conditioning operation, the detected room temperature is set to the set temperature on the assumption that the operation start switch provided on each of the indoor units 22 to 24 or the remote controller connected thereto is turned on by the user. When it has not reached, the deviation signal and a cooling operation request signal or a heating operation request signal according to the switching position of the cooling / heating switching switch,
This is performed by being output from each of the indoor units 22 to 24 to the heat pump operation control device 31. In other words, the compressor is driven with a compression capacity corresponding to the magnitude of the deviation signal, and during the cooling operation, refrigerant circulation is performed in which the outdoor heat exchanger acts as a condenser and the indoor heat exchanger acts as an evaporator. During the heating operation, refrigerant circulation is performed in which the outdoor heat exchanger acts as an evaporator and the indoor heat exchanger acts as a condenser. When the detected room temperature reaches the set temperature due to the continuation of the air-conditioning operation, that is, when the thermostat is turned off, the output of the cooling or heating operation request signal is stopped, thereby stopping the air-conditioning operation.

On the other hand, when the operation start switch of the remote controller 32 for drying operation connected to the drying unit 29 is turned on by the user, the drying operation control device provided in the drying unit 29 is operated. 3
A drying operation request signal is output from 3 to the heat pump operation control device 31, and the operation is performed by causing the drying heat exchanger to function as a condenser.

At this time, in the mode batting in which the cooling operation request signal and the drying operation request signal are simultaneously generated, the indoor cooling operation is prioritized, and the ventilation fan is operated to ventilate the air in the drying chamber 30 and dry. It is supposed to do.

[0010]

In the above-mentioned prior art, the hot air drying system is used, so that in summer, the mode batting is overlapped with other room cooling, and there is a problem that the hot air drying operation cannot be performed. If once again over de batting has occurred, since merely the ventilation fan by drying, drying speed and drying efficiency is poor.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional drawbacks, and has as its object to provide a heat pump system which prevents mode batting with an air-conditioned room and improves drying speed and drying efficiency. It is in.

[0012]

Therefore, the heat pump system according to the first aspect of the present invention includes an indoor unit 22 disposed in an air-conditioned room.
23, 24 and a drying unit 29 arranged in the drying chamber 30
Are connected to the outdoor unit 21 in parallel with each other, and a ventilation fan 42 is provided in the drying room 30 to circulate a refrigerant from the outdoor unit 21 to the indoor units 22, 23, and 24 to perform indoor cooling operation, In addition, the indoor units 22, 23, 24
In the heat pump system in which the refrigerant is circulated to perform the indoor heating operation, the indoor heat exchanger 5 provided in the drying unit 29 is divided into two and the indoor heat exchanger 5a, 5b An operation mode in which a parallel circuit of the on-off valve 10 and the pressure reducing mechanism 11 is interposed, the drying operation is performed in the dehumidifying operation mode during the indoor cooling operation, and the ventilation mode with the ventilation fan 42 added to the heating operation mode during the indoor heating operation in the drying mode control unit 43 to perform the drying operation is provided, further
A temperature detecting means 41 for detecting the outside air temperature is provided,
The mode control means 43 controls the outside air
If the temperature is higher than the specified temperature,
While the drying operation is being performed, if the outside air temperature is
Is dry in the operation mode that adds the ventilation mode to the heating operation mode.
It is characterized by performing dry operation .

[0013]

[0014]

According to the heat pump system of the first aspect,
As shown in FIG. 1, when drying is performed during the cooling operation,
An indoor heat exchanger 5a divided into two drying units 29,
5b, the on-off valve 10 is closed and one of the indoor heat exchangers 5 is closed.
In the dehumidifying operation mode, a is used as a condenser and the other indoor heat exchanger 5b is used as an evaporator to dry clothes. During the heating operation, the opening / closing valve 10 of the drying unit 29 is opened, and the indoor heat exchanger 5 is set as a condenser to set the heating operation mode to blow hot air.
Drying of clothes is performed by driving 2.

[0015] In the above heat pump system, in the intermediate stage or the like is not performed cooling and heating operations, can be performed drying operation of a good operating mode efficiency depending on the outside air temperature. Only
In the above heat pump system,
When performing hot air drying, the ventilation fan 42
Ventilation of the air in the dry room allows the
Air is discharged to the outside of the drying chamber.
Drying speed and drying effect compared to hot air drying
The rate is improved.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, specific embodiments of the heat pump system of the present invention will be described in detail with reference to the drawings. The overall configuration is the same as that of FIG. 7, and the indoor heat exchanger in the drying unit 29 can be operated in the dehumidifying operation mode. In the drying operation mode, the ventilation fan is switched to the dehumidifying operation mode or the heating operation mode. The ventilation mode is added to the ventilation mode.

[0017]

FIG. 3 shows a refrigerant system diagram , in which 1 is a compressor, 2 is a four-way switching valve, 3 is an outdoor heat exchanger,
Reference numeral 4 denotes an electric expansion valve, and reference numeral 5 denotes an indoor heat exchanger. These are connected to each other to form a refrigerant circulation path 6. 7 indicates an outdoor fan, and 8 indicates an indoor fan. Reference numeral 4a shown in FIG. 3 is a pressure reducing valve . further
More specifically, the discharge side and the suction side of the compressor 1 have four paths.
Connected to the two primary ports of the switching valve 2 and
The two secondary ports of the switching valve 2 are connected to the first gas pipe 6a and the second gas pipe.
Connected to the pipe 6b. The first gas pipe 6a is for outdoor heat
Connected to the heat exchanger 3 and reduced to this outdoor heat exchanger.
One end of the liquid pipe 6c provided with the pressure valve 4a is connected.
You. The other end of the liquid pipe 6c branches into a plurality of liquid branch pipes 6d.
Each of the liquid branch pipes 6d,.
Each of the expansion valves 4... 4 is interposed, and
The indoor heat exchangers 5 are connected. Also each room heat
The exchangers 5 are connected to the gas branch pipes 6e, 6e, respectively.
One end is connected, and the other end of each gas branch pipe 6e.
Thus, it is connected to the second gas pipe 6b. So
In the above heat pump system, the outdoor heat exchange
Unit 3 is a condenser, and each indoor heat exchanger 5 is an evaporator
Recirculate the refrigerant in the direction in which it functions (in the direction of the solid line in the figure).
Perform cooling operation with. At this time, the pressure reducing valve 4a is fully opened.
Electric expansion that is maintained and corresponds to each indoor heat exchanger 5,
The valves 4... 4 are controlled opening degrees, and each indoor heat exchanger 5.
No control to keep the degree of superheat at the outlet side of 5 almost constant
It is. During the heating operation, the four-way switching valve 2 is set to the position indicated by the broken line.
Switching, each indoor heat exchanger 5, .5 is condenser, outdoor heat exchange
So that the vessel 3 becomes an evaporator, that is, in the direction of the arrow in the figure,
Is circulated. At this time, each electric expansion valve 4,.
Subcooling degree at the outlet side of indoor heat exchangers 5
While performing such control, the outdoor pressure is reduced by the pressure reducing valve 4a.
Control so that the degree of superheat at the outlet side of the exchanger 3 is substantially constant
Is made. And among the indoor heat exchangers 5,.
The heat exchanger corresponding to the indoor units 22, 23 and 24 is a normal heat exchanger.
However, the heat exchanger of the drying unit 29 is as follows.
It has such a configuration.

The indoor heat exchanger 5 is divided into a first indoor heat exchanger 5a located on the electric expansion valve 4 side and a second indoor heat exchanger 5b located on the compressor 1 side. Both indoor heat exchangers 5 a and 5 b are connected in series by a connection path 9. An on-off valve 10 is interposed in the connection path 9, and a capillary tube (decompression mechanism) 11 is connected to the on-off valve 10 in parallel.

As shown in FIG. 4, the on-off valve 10 includes a first passage 12 connected to the first indoor heat exchanger 5a,
It has a second passage 13 connected to the indoor heat exchanger 5b, and an internal flow passage 14 communicating the two passages 12, 13, and a valve seat 15 is formed in the internal flow passage 14.

In the internal flow path 14, a valve body 16 is disposed at a position closer to the first passage 12 than the valve seat 15 so as to be reciprocally slidable. When the valve element 16 comes into contact with or separates from the valve seat 15, the on-off valve 10 can be closed and opened.

A bias spring 17 is provided at a position closer to the first passage 12 than the valve body 16, and the bias spring 17 urges the valve body 16 in the valve closing direction. Further, a shape memory spring 18 is provided between the valve body 16 and the valve seat 15, and the shape memory spring 18 is used by the shape memory spring 18.
Is biased in the valve opening direction.

This shape memory spring 18 is made of a shape memory alloy,
It is made of a shape memory resin or the like, and is in an extended state in a temperature range similar to the temperature of the refrigerant flowing through the indoor heat exchanger 5 during the cooling operation. The valve is open as shown in 4.

However, when the temperature further decreases, the state is contracted, and the valve is closed by the force of the bias spring 17 as shown in FIG. Note that reference numeral 20 in FIG. 3 denotes a valve closing control unit for controlling the valve closing operation of the on-off valve 10.

Next, an operation state of the air conditioner will be described. First, as shown by a solid arrow A in FIG. 3, the refrigerant from the compressor 1 is condensed by the outdoor heat exchanger 3 and is evaporated by the indoor heat exchanger 5 to perform a cooling operation. As indicated by the arrow B, the heating operation is performed by condensing in the indoor heat exchanger 5 and evaporating in the outdoor heat exchanger 3.

In the dehumidifying operation, in the cooling operation mode, the outdoor fan 7 is stopped, the electric expansion valve 4 is fully opened, the on-off valve 10 is closed, the first indoor heat exchanger 5a is condensed, and the second indoor Each function of evaporation is performed by the heat exchanger 5b, the indoor fan is driven, and the indoor air cooled and dehumidified by the second indoor heat exchanger 5b is heated to about room temperature by the first indoor heat exchanger 5a. It is performed by returning to the room.

Next, the closing operation of the on-off valve 10 by the valve closing control means 20 will be described with reference to FIG. First, the operation is started in the cooling operation mode. At this time, the inverter frequency of the compressor 1 is set high (80 Hz), and
The electric expansion valve 4 is also set to the control opening degree, and the indoor fan 8
Is stopped, and the outdoor fan 7 is kept in operation.

Thereafter, the opening degree of the electric expansion valve 4 is reduced stepwise as shown in FIG. As a result of stopping the indoor fan 8 and gradually reducing the opening of the electric expansion valve 4 as described above, the temperature of the refrigerant flowing through the on-off valve 10 becomes lower than the refrigerant temperature during the cooling operation, and the shape memory is stored. The spring 18 is in a contracted state, the valve element 16 contacts the valve seat, and the on-off valve 10 is closed.

At this time, the shape memory spring 18 is cooled by the liquid refrigerant or the gas-liquid mixed refrigerant having a larger heat capacity than the gas refrigerant, so that the temperature is rapidly lowered.
Is quickly performed. Then, after a lapse of a sufficient time T for performing the valve closing operation, the electric expansion valve 4 is fully opened, the outdoor fan 7 is stopped, and then the inverter frequency of the compressor 1 is reduced to the steady operation frequency. Then, the indoor fan 8 is driven to start the dehumidifying operation.

In this case, the coolant temperature rises with the start of the dehumidifying operation, the shape memory spring 18 of the on-off valve 10 is extended, and the valve body 16 is urged in the valve closing direction.
A differential pressure of the refrigerant flow acts on the valve body 16, and the valve closing state is maintained by the differential pressure.

The indoor units 22, 23 and 24 are operated for cooling.
When starting the dehumidifying operation of the drying unit 29 during
Continue operation of the indoor fan 8 of each indoor unit 22, 23, 24
The electric expansion valves 4, 4 from the control opening to a certain opening
In this state, the electric power of the drying unit 29 is
By controlling the expansion valve 4 to be closed and the on-off valve 10 to be closed,
To start the dehumidifying operation, and thereafter, the indoor units 22, 23, 24
Cooling operation and dehumidifying operation of the drying unit 29 are continued.
You. With the above configuration, the drying operation in the dehumidifying operation mode can be performed during the cooling operation, and the drying operation in the hot air + ventilation mode can be performed during the heating operation, thereby preventing occurrence of mode batting. Dry in hot air + ventilation mode
Drying operation is compared to drying only with warm air.
This is to improve the drying speed and the drying efficiency.
That is, as shown in FIG.
The air in the room 30 is discharged outside the room by the ventilation fan 42.
This promotes drying.

Next, a description will be given of a drying operation mode in an intermediate period in which cooling and heating are not performed. First, FIG. 2 shows the drying time in the dehumidifying operation mode for 2 kg of the short-sleeved cotton shirt and the drying mode in the heating operation (warm air) mode plus the ventilation mode using the ventilation fan. As shown in the drawing, in the dehumidifying operation mode, the lower the outside air temperature, the longer the drying time, and the higher the outside air temperature, the shorter the drying time. In the hot air + ventilation operation mode, the drying time with respect to the outside air temperature is the same as in the dehumidification operation mode, but the slope of the curve is different. That is, in the warm air + ventilation operation mode, when the outside air temperature is low, the drying time is shorter than that in the dehumidification operation mode. However, when the outside air temperature is higher than a certain intermediate temperature, the drying time is shorter in the dehumidification operation mode. This is because the moisture evaporates and the clothes dries substantially faster when the dehumidification is performed than when the temperature in the drying chamber is increased.

Accordingly, in the present invention, as shown in FIG. 1, a ventilation fan 42 for ventilating the air in the drying room and a temperature detecting means (for example, a thermistor) 41 for detecting the outside air temperature are provided. Upon receiving the signal, the drying mode control means 43 controls the indoor heat exchanger 5 and the ventilation fan 42 based on the level of the outside air temperature.

Here, as shown in FIG. 2, the switching between the hot air drying method and the dehumidification drying method is performed by the dehumidification operation mode and the hot air +
It is the outside air temperature at the point where the curve with the ventilation operation mode intersects. When the outside air temperature is higher than the temperature at the intersection, the dehumidification drying method is used, and when the outside air temperature is low, the hot air drying method is used.

That is, the signal from the temperature detecting means 41 reads the temperature at the intersection of the two curves and the drying mode control means 43. If the outside air temperature is higher than the intersection of the two curves,
The indoor heat exchanger 5 is switched to the above-described dehumidifying operation mode. When the outside air temperature is lower than the intersection of the two curves, the drying mode control means 43 sets the indoor heat exchanger 5 to the heating operation mode and drives the ventilation fan 42 to set the room to the hot air + ventilation operation mode. It is. By switching the drying mode as described above, the drying speed and the drying efficiency can be improved.

[0036]

As described above, in the heat pump system of the present invention , in the cooling operation, the drying room is dried in the dehumidification operation mode, and in the heating operation, the ventilation mode by the ventilation fan is added to the heating operation mode. Drying operation is carried out, so that mode batting with an air-conditioned room (cooling operation) can be prevented, and the bathroom (drying room) becomes comfortable because the dehumidification operation mode is used without hot air drying in summer. . Furthermore, in the middle period etc. , switch the drying mode
Thus , the drying speed and the drying efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a graph showing a relationship between an outside air temperature and a drying time in each drying mode of the present invention.

FIG. 3 is a refrigerant circuit diagram of the present invention.

FIG. 4 is a diagram showing an open state of the on-off valve according to the present invention.

FIG. 5 is a view showing a closed state of the on-off valve according to the present invention.

FIG. 6 is a timing chart illustrating an operation control example of the on-off valve according to the present invention.

FIG. 7 is a circuit diagram of a heat pump system.

[Explanation of symbols]

 Reference Signs List 5 indoor heat exchanger 5a first indoor heat exchanger 5b second indoor heat exchanger 10 on-off valve 11 capillary tube 21 outdoor unit 22 indoor unit 23 indoor unit 24 indoor unit 29 drying unit 30 drying room 41 temperature detecting means 42 ventilation fan 43 Drying mode control means

Claims (1)

(57) [Claims] 1. An indoor unit (22) arranged in an air-conditioned room.
(23) The drying unit (29) arranged in the drying room (30) and the drying unit (29) are connected in parallel to the outdoor unit (21), and the drying room (30) is provided with a ventilation fan (42).
And the indoor unit (22) (2) from the outdoor unit (21).
3) circulating the refrigerant to (24) to perform indoor cooling operation,
In addition, the indoor units (22), (23), (24) and the outdoor units (2)
In the heat pump system in which the refrigerant is circulated to perform the indoor heating operation, the drying unit (2)
9), the indoor heat exchanger (5) is divided into two, and the on-off valve (1) is provided between the indoor heat exchangers (5a) and (5b).
0) and a decompression mechanism (11) are provided in parallel, a drying operation is performed in a dehumidifying operation mode during indoor cooling operation , and a ventilation fan (42) is switched to heating operation mode during indoor heating operation. Drying mode control means (43) for performing a drying operation in the operation mode to which the ventilation mode is added , and further detecting the outside air temperature
A temperature detection means (41), wherein the drying mode control means is provided;
(43) specifies the outside air temperature when the indoor air conditioning is not operating
If the temperature is higher than the drying temperature,
On the other hand, if the outside air temperature is lower than the specified temperature,
Drying operation is performed in the operation mode with the ventilation mode added to the operation mode.
Heat pump system, characterized in that the cormorant.