JP3417364B2 - Humidity control ventilator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a humidity control ventilation device for humidifying or dehumidifying air from the outside and supplying it to the inside of the room.

[0002]

2. Description of the Related Art There is a humidity control ventilation device which sucks in air from the outside to humidify or dehumidify it and supplies the humidity-adjusted air to the inside of the room. This includes an air supply path for supplying outdoor air to the room and an exhaust path for exhausting indoor air to the outside. An air supply fan for sucking the outdoor air and supplying it to the room is arranged in the air supply path, and an exhaust fan for discharging the indoor air to the outside is arranged in the exhaust path. At this time, by providing a heat exchanger such as a sensible heat exchanger between the air supply path and the exhaust path, it is possible to make the configuration in which the indoor temperature does not easily change due to the influence of the outside air temperature.

A humidifier for humidifying the sucked outdoor air and a dehumidifier for dehumidifying are arranged in the air supply path. As the humidifier, for example, a moisture permeable membrane humidifier configured by arranging a plurality of moisture permeable membrane pipes in parallel with each other and arranging humidifying water around the moisture permeable membrane pipes can be used. The moisture permeable membrane humidifier humidifies the air passing through the moisture permeable membrane pipe by evaporating the surrounding moisture. By using such a moisture permeable membrane humidifier, the outdoor air sucked by the air supply fan is humidified when passing through the moisture permeable membrane pipe and is supplied to the room.

The dehumidifier is an ordinary air conditioner (air conditioner).
It is conceivable that a refrigerant circuit similar to the above is configured and the heat exchanger on the indoor unit side acts as an evaporator. An outdoor heat exchanger, a compressor, an accumulator, a four-way switching valve, a pressure reducer, etc. are arranged on the outdoor unit, and an indoor heat exchanger is arranged on the indoor unit side.
Accumulator, compressor, four-way switching valve, outdoor heat exchanger,
A refrigerant circuit that connects the pressure reducer and the indoor heat exchanger is configured.
Just as when cooling the air conditioner, the four-way switching valve is controlled to operate the compressor so that the outdoor heat exchanger functions as a condenser and the indoor heat exchanger functions as an evaporator. Can be supplied indoors.

When performing humidification using the above humidifier, it is difficult to perform sufficient humidification in the winter when the outside air temperature is low, because the temperature of the outdoor air taken in is low. Therefore, it is conceivable to operate the refrigerant circuit so that the indoor heat exchanger functions as a condenser, contrary to the time of dehumidification, and heat and supply the sucked outdoor air. In this case, the compressor is operated by controlling the four-way switching valve so that the outdoor heat exchanger serves as the evaporator and the indoor heat exchanger serves as the condenser, as in the case of heating the air conditioner. This is called a humidification assist operation. In this humidification assist operation, the sucked outdoor air can be heated by the indoor heat exchanger, and the humidifying capacity of the humidifier can be enhanced.

[0006]

In the humidity control / ventilation apparatus as described above, the space for installing the indoor heat exchanger cannot be made large as compared with the ordinary air conditioner, and the size of the indoor heat exchanger is large. Limited. For this reason, the heat exchange volume and the heat exchange passing air volume by the indoor heat exchanger must be reduced. When the humidification assist operation is performed in this state, the condensing pressure of the compressor may be significantly increased due to a large difference in capacity between the indoor heat exchanger and the outdoor heat exchanger. In particular, immediately after the start of the humidification assist operation, the condensing temperature rises sharply, which may deviate from the usage conditions of the compressor and raise the condensing pressure to damage the compressor.

An object of the present invention is to prevent the compressor from being damaged at the time of starting the humidification assist operation of the humidity control ventilation device.

[0008]

A humidity control ventilation apparatus according to the present invention includes an air supply path for supplying air from the outside to the indoor side, and an exhaust path for discharging indoor air to the outside.
An air supply fan arranged in the air supply path, an exhaust fan arranged in the exhaust path, a humidifier arranged in the air supply path for humidifying air from the outside, an indoor heat exchanger, and a four-way A switching valve, an accumulator, a compressor, an outdoor heat exchanger, and a refrigerant circuit including a pressure reducer, the indoor heat exchanger of the refrigerant circuit is arranged in the air supply path, when the humidification amount by the humidifier is insufficient, A humidity control ventilation device having a humidification assist mode for heating and operating a refrigerant circuit using an indoor heat exchanger as a condenser,
After the operation in the humidification assist mode is started, the function of the compressor is limited for a certain period of time.

Here, a pressure control valve provided on the discharge side of the compressor and a pressure control path for short-circuiting the discharge side and the suction side of the compressor via the pressure control valve are further provided, and operation in the humidification assist mode is performed. After starting, the pressure control valve can be controlled for a certain period of time to control the pressure of the compressor. In addition, an inverter circuit for controlling the frequency of the compressor may be provided, and the frequency of the inverter circuit may be limited to a low value for a certain period of time after the operation in the humidification assist mode is started.

Further, the humidifier is constructed by arranging a plurality of moisture permeable membrane pipes in parallel with each other and arranging humidifying water around the moisture permeable membrane pipe, and passing through the inside of the moisture permeable membrane pipe. It can be configured by a moisture permeable membrane humidifier that humidifies the air to be generated. Further, it may be configured to further include a sensible heat exchanger that is disposed across the air supply path and the exhaust path and that performs heat exchange between the air passing through both paths.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION <Outline of Indoor Unit> A humidity control / ventilation apparatus to which an embodiment of the present invention is applied will be described with reference to the drawings. FIG. 1 is a side sectional view showing a schematic configuration of an indoor unit of a humidity control ventilation device, and FIG. 2 is a plan sectional view thereof.

The indoor unit 1 has an indoor unit casing 2 formed in a substantially rectangular shape. This indoor unit casing 2
Are an outside air introduction port 11 for introducing the outside air OA, an indoor side discharge port 12 for discharging the sucked outside air OA to the indoor side as the supply air SA, and an indoor air introduction port 13 for introducing the indoor air RA. The outdoor side exhaust port 14 for exhausting the sucked indoor air RA to the outside as the exhaust air EA.

The interior of the indoor unit casing 2 is hollow, and an air supply path RS from the outside air inlet 11 to the indoor side outlet 12 and an exhaust path RE from the indoor air inlet 13 to the outdoor side outlet 14 are provided. Are formed. Inside the outside air introduction port 11, a filter 15 for filtering the introduced outside air OA is provided. An indoor heat exchanger 16 forming a refrigerant circuit described later is arranged further inside the filter 15. The indoor heat exchanger 16 has a connecting pipe connecting portion 24 in the indoor heat exchanger 16, and is connected to the connecting pipe through the connecting pipe connecting portion 24 to form a refrigerant circuit. When the indoor heat exchanger 16 acts as a condenser in the refrigerant circuit, it functions as a dehumidifier that dehumidifies the outside air OA.

A sensible heat exchanger 17 is provided further inside the indoor heat exchanger 16. This sensible heat exchanger 17
It is provided over the air supply route RS and the exhaust route RE, and is configured so that the air passing through both routes can perform heat exchange in a non-contact manner. A filter 18 for filtering the indoor air RA is provided on the indoor side in the exhaust path RE of the sensible heat exchanger 17.

A humidifier 19 is arranged further inside the sensible heat exchanger 17. The humidifier 19 is composed of a plurality of moisture permeable membrane pipes arranged in parallel with each other, and humidifying water is arranged around the moisture permeable membrane pipes. An air supply fan 20 is provided near the indoor outlet 12. The air supply fan 20 is composed of a crossflow fan that blows air in a direction intersecting with the rotation axis, and is rotationally driven by a fan motor 21 to
Air supply route R from the outside air inlet 11 to the indoor outlet 12
An air flow is generated in S.

An exhaust fan 22 is provided near the indoor air inlet 13. The exhaust fan 22 is composed of a cross-flow fan similar to the air supply fan 20, and is rotationally driven by a fan motor 23 to generate an exhaust path RE from the indoor air inlet 13 to the outdoor outlet 14.
To generate an air flow. <Communication Pipe> This humidity control ventilation device has an outdoor unit 31 as shown in FIG. The outdoor unit 31 includes an outdoor unit casing 32, and the internal mechanism has the same configuration as the outdoor unit of a normal separate type air conditioner.

The indoor unit 1 and the outdoor unit 31 are connected by a connecting pipe 25 for forming a refrigerant path and an internal / external transmission line (not shown) for transmitting / receiving data.
The connecting pipe 25 is connected to the connecting pipe connecting portion 24 provided in the indoor heat exchanger 16 of the indoor unit 1, and is connected to an outdoor heat exchanger or the like arranged inside the outdoor unit 31. A temperature sensor and a humidity sensor (not shown) for detecting the temperature and humidity of the surroundings are provided in the vicinity of the connection pipe 25 connection portion of the indoor unit casing 2.

[First Embodiment] <Refrigerant Circuit> FIG. 4 shows a refrigerant circuit adopted in the first embodiment.
Shown in. An indoor heat exchanger 16 is provided in the indoor unit 1. The indoor heat exchanger 16 is composed of a heat transfer tube that is folded back a plurality of times at both ends in the length direction, and a plurality of fins through which the heat transfer tube is inserted, and performs heat exchange with contacting air.

The outdoor unit 31 includes a compressor 33 and a compressor 3
Four-way switching valve 34 connected to the discharge side of No. 3, and compressor 33
An accumulator 35 connected to the intake side of the air conditioner, an outdoor heat exchanger 36 connected to the four-way switching valve 34, and a pressure reducer 37 including an electric expansion valve connected to the outdoor heat exchanger 36 are provided. . The decompressor 37 is connected to the communication pipe 25 via a liquid shutoff valve 38, and is connected to one end of the indoor heat exchanger 16 via the communication pipe 25. The four-way switching valve 34 is connected to the communication pipe 25 via the gas shutoff valve 39, and the indoor heat exchanger 1 is connected via the communication pipe 25.
6 is connected to the other end.

<Indoor unit control unit> Inside the indoor unit 1, as shown in FIG. 5, a CPU 41 for controlling each unit is provided. The CPU 41 is a microprocessor such as a one-chip microcomputer. Connected to the CPU 41 are a ROM 42 that stores a control program for the apparatus and a RAM 43 that temporarily stores various parameters.

The CPU 41 is also connected to an instruction receiving section 44 that receives an instruction signal from a remote controller, an indoor switch, or another air conditioner. Furthermore, CP
A fan motor 21 for air supply and a fan motor 23 for exhaust are connected to U41. The indoor unit 1 and the outdoor unit 31 are connected to each other via an internal / external transmission line for transmitting / receiving data. The CPU 41 is connected to the internal / external transmission line via the internal / external transmission line interface 49, and transmits / receives data to / from the CPU of the outdoor unit 31. Furthermore, CPU
The other input / output unit 50 is connected to 41.

<Outdoor unit control section> Inside the outdoor unit 31,
As shown in FIG. 6, a CPU 51 for controlling each unit is provided. The CPU 51 is a microprocessor such as a one-chip microcomputer. The CPU 51 has a ROM 52 in which a control program for the apparatus is stored,
A RAM 53, which temporarily stores various parameters, etc., is connected.

Further, the compressor 33 arranged in the refrigerant circuit.
An inverter circuit 54 for driving the CPU is connected to the CPU 51. The inverter circuit 54 supplies the compressor 33 with a drive current which is obtained by once converting the commercial AC power supply into DC and further converting it into AC. At this time, the frequency of the drive current input to the compressor 33 is controlled, and the higher the frequency of the drive current input, the higher the capacity.

The actuator of the four-way switching valve 34 is a CPU
It is configured to be controlled by 51. As shown in FIG. 4, the four-way switching valve 34 supplies the refrigerant from the compressor 33 to the outdoor heat exchanger 36 side during cooling, and supplies the refrigerant from the compressor 33 to the indoor heat exchanger 16 side during heating. Switching control is performed so as to supply. Further, a timer 55 for counting the elapse of a predetermined time from the time when the instruction to start the humidifying operation is connected to the CPU 51.

The outdoor unit 31 is provided with a propeller fan for discharging heat from the outdoor heat exchanger 36 to the outside of the unit, and a fan motor 56 for driving the propeller fan is connected to the CPU 51. There is. The CPU 51 is connected to the internal / external transmission line interface 57, and transmits / receives data to / from the CPU 41 of the indoor unit 1 via the internal / external transmission line. Further, the CPU 51 has other input / output units 5
8 is connected.

<Basic Control> In this humidity control ventilation device, as shown in FIG.
Basic control is performed based on the flowchart shown in FIG. When the power is turned on, in step S1, RA
Initialize each part by initializing various parameters of M43 and 53.

In step S2, it is determined whether or not there is a humidifying operation instruction. When the instruction receiving unit 44 receives an instruction to perform humidification from a remote controller, an indoor switch, or another air conditioner, it is determined that the humidifying operation instruction has been issued, and the process proceeds to step S3. In step S3, the indoor unit 1
The fan motors 21 and 23 drive the air supply fan 20 and the exhaust fan 22 to perform a humidification operation in which the sucked outside air is humidified and supplied to the indoor side. Here, if necessary, the refrigerant circuit is operated so that the indoor heat exchanger 16 functions as a condenser, and the humidification assist operation is performed to maintain the air passing through the humidifier 19 at an appropriate temperature.

In step S4, it is determined whether or not a dehumidifying operation instruction is given. When the instruction receiving unit 44 receives an instruction to perform dehumidification from a remote controller, an indoor switch, or another air conditioner, it is determined that a dehumidification operation instruction has been issued, and the process proceeds to step S5. In step S5, the refrigerant circuit is caused to operate so that the indoor heat exchanger 16 functions as an evaporator, and the fan motors 21 and 23 of the indoor unit 1 drive the air supply fan 20 and the exhaust fan 22 to suck the outside air. A dehumidifying operation for dehumidifying and supplying to the indoor side is executed.

In step S6, other processing is executed. <Humidification Operation Control> During the humidification operation (step S3 in FIG. 7), control is performed based on the flowchart shown in FIG. In step S11, it is determined whether to perform the humidification assist operation. Here, an outside air temperature sensor (not shown)
When the temperature of the outside air detected by is equal to or lower than a predetermined value, or when an instruction for the humidification assist operation is received from a remote controller, an indoor switch, or another air conditioner, the humidification assist operation is performed and the process proceeds to step S13. In other cases, it is determined that the humidification assist operation is not performed, and the process proceeds to step S12.

In step S12, the air supply fan 20 and the exhaust fan 22 are driven by the fan motors 21 and 23 of the indoor unit 1 to execute a normal humidifying operation. Step S
At 13, the timer 55 is set to a predetermined time. Here, the timer 55 is set to a time period during which the humidification assist operation is started and the condensing pressure of the compressor 33 is considered to be equal to or lower than a certain value.

In step S14, the four-way switching valve 34 is switched to set the refrigerant circuit so that the indoor heat exchanger 16 serves as a condenser, and the inverter circuit 54 for driving the compressor 33 is set.
The heating operation is started by limiting the upper limit frequency of to lower than usual. At the same time, the fan motors 21, 2 of the indoor unit 1
The air supply fan 20 and the exhaust fan 22 are driven by 3 to start the ventilation operation. As a result, the outdoor air is heated by the indoor heat exchanger 16, and the humidifier 19 appropriately performs the humidification.

In step S15, it is determined whether or not the timer 55 has been turned off. When the timer 55 detects that the predetermined time has elapsed and turns off, the process proceeds to step S16. In step S16, the limitation on the upper limit frequency of the inverter circuit 54 is released. FIG. 9 shows a time chart in this humidification assist operation. At time t _{0 when the} humidification assist operation is started, the timer 55 is turned on and the upper limit frequency of the inverter circuit 54 is limited. At time t ₁ after a lapse of T time from turning on the timer 55, the frequency limitation of the inverter circuit 54 is released.

In step S17, it is determined whether or not there is an instruction to stop the humidifying operation. If an instruction to stop the operation is given from the remote controller, an indoor switch, or another air conditioner, or if it is determined that the indoor humidity has reached the set humidity, it is considered that the instruction to stop the humidifying operation is given, and step S is performed.
Go to 18. In step S18, this humidifying operation is stopped.

<Effect of First Embodiment> Indoor heat exchanger 16
By acting as a condenser to perform the humidification assist operation, the sucked outside air can be maintained at an appropriate temperature, the humidification effect of the humidifier 19 can be sufficiently exerted, and the humidification assist operation is started. From the inverter circuit 54 that drives the compressor 33 for a predetermined time from
Since the upper limit frequency is restricted, it is possible to prevent the condensation temperature of the compressor 33 from rising abnormally and prevent damage to the compressor 33.

[Second Embodiment] <Refrigerant Circuit> FIG. 10 shows a refrigerant circuit according to a second embodiment. The configuration is substantially the same as that of the first embodiment, and the same portions are denoted by the same reference numerals and the description thereof is omitted.

Compressor 33 used in the second embodiment
Is a refrigerator, not an inverter control type. A pressure control valve 61 is provided on the discharge side of the compressor 33, and a pressure control path 62 short-circuited from the discharge side of the compressor 33 to the suction side is formed via the pressure control valve 61. <Outdoor Unit Control Unit> The control unit of the indoor unit is the same as that of the first embodiment, and the description thereof is omitted. Further, the control unit of the outdoor unit has a configuration as shown in FIG. Also in this case, the same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

Here, a pressure control valve drive section 63 is provided in place of the inverter circuit 54 of the first embodiment.
The pressure control valve drive unit 63 drives the actuator of the pressure control valve 61. By controlling the pressure control valve 61 by the pressure control valve drive unit 63, the pressure on the discharge side of the compressor 33 is divided to the suction side, and the compressor 33
It is possible to control the condensation pressure of the.

<Humidification Operation Control> The basic control of this second embodiment is the same as that of the first embodiment, and it operates according to the flowchart of FIG. The humidifying operation is controlled based on the flowchart shown in FIG.

In step S21, it is determined whether or not the humidification assist operation is performed. Here, the humidification assist is performed when the temperature of the outside air detected by the outside air temperature sensor (not shown) is less than or equal to a predetermined value, or when an instruction for the humidification assist operation is received from a remote controller, an indoor switch, or another air conditioner. The operation proceeds to step S23 as an operation,
In other cases, the humidification assist operation is not performed, and the process proceeds to step S22.

In step S22, the fan motors 21 and 23 of the indoor unit 1 drive the air supply fan 20 and the exhaust fan 22 to execute a normal humidifying operation. Step S
At 23, the timer 55 is set to a predetermined time. Here, the timer 55 is set to a time period during which the humidification assist operation is started and the condensing pressure of the compressor 33 is considered to be equal to or lower than a certain value.

In step S24, the four-way switching valve 34 is switched so that the indoor heat exchanger 16 serves as a condenser, the refrigerant circuit is set, and the heating operation is performed, and the pressure control valve drive unit 63 causes the pressure control valve 61 to operate. To start pressure control on the discharge side of the compressor 33. At the same time, the fan motors 21 and 23 of the indoor unit 1 drive the air supply fan 20 and the exhaust fan 22 to start the ventilation operation. As a result, the outdoor air is heated by the indoor heat exchanger 16, and the humidifier 19 appropriately performs the humidification.

In step S25, it is determined whether or not the timer 55 is turned off. When the timer 55 detects that the predetermined time has elapsed and turns off, the process proceeds to step S26. In step S26, the pressure control is released. Here, the pressure control can be released by closing the pressure control valve 61. FIG. 13 shows a time chart in this humidification assist operation. At time t _{0 when the} humidification assist operation is started, the timer 55 is turned on and the pressure control by the pressure control valve 61 is started. At time t ₁ after a lapse of T time from turning on the timer 55, the pressure control by the pressure control valve 61 is released.

In step S27, it is determined whether or not there is an instruction to stop the humidifying operation. If an instruction to stop the operation is given from the remote controller, an indoor switch, or another air conditioner, or if it is determined that the indoor humidity has reached the set humidity, it is considered that the instruction to stop the humidifying operation is given, and step S is performed.
Move to 28. In step S28, this humidifying operation is stopped.

<Effects of Second Embodiment> Similar to the first embodiment, the indoor heat exchanger 16 acts as an evaporator to perform the humidification assist operation, so that the sucked outside air can be maintained at an appropriate temperature. Therefore, the humidifying effect of the humidifier 19 can be sufficiently exerted. Further, the pressure control of the compressor 33 is performed for a predetermined time from the start of the humidification assist operation, so that it is possible to prevent the condensation temperature of the compressor 33 from rising abnormally and prevent the compressor 33 from being damaged.

[Third Embodiment] <Refrigerant Circuit> The refrigerant circuit used in the third embodiment is the same as that in the first embodiment, and the description thereof will be omitted. <Indoor unit control unit> The control unit of the indoor unit is configured as shown in FIG. 14, and the same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

Located near the connection with the connecting pipe 25,
A piping temperature sensor 71 and a piping humidity sensor 72 for detecting the ambient temperature are attached. The temperature detected by the pipe temperature sensor 71 and the humidity detected by the pipe humidity sensor 72 are input to the CPU 41.
The temperature / humidity information detected by the pipe temperature sensor 71 and the pipe humidity sensor 72 is used as the interface 4 for the internal and external transmission lines.
9 is transmitted to the CPU of the outdoor unit 31.

The indoor heat exchanger 16 is provided with an evaporation temperature sensor 73 composed of a thermistor or the like for detecting the evaporation temperature of the refrigerant passing through the inside thereof. The temperature information detected by the evaporation temperature sensor 73 is input to the CPU 31 via the internal / external transmission line interface 49. <Outdoor Unit Control Unit> The control unit of the outdoor unit is configured as shown in FIG. 15, and the same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

<Basic Control> Also in the third embodiment, similar to the first embodiment, the basic control is performed based on the flowchart shown in FIG. 7, and the description thereof is omitted here. <Dehumidification Operation> During the dehumidification operation, control is performed based on the flowchart shown in FIG.

In step S31, the refrigerant circuit is set and the dehumidifying operation is started. Here, the indoor heat exchanger 1
The cooling operation is performed by switching the four-way switching valve 34 so that 6 serves as an evaporator and the outdoor heat exchanger 36 serves as a condenser. As a result, moisture can be removed from the outside air passing through the indoor heat exchanger 16, and dehumidified air can be supplied to the indoor side.

In step S32, the temperature and humidity of the pipe section and the evaporation temperature of the refrigerant in the indoor heat exchanger 16 are detected.
As the piping temperature and humidity, the piping temperature and humidity T _o detected by the piping temperature sensor 71 and the piping humidity sensor 72 are used. Further, the evaporation temperature is used evaporation temperature T _e of the indoor heat exchanger 16 to vaporization temperature sensor 72 is detected. In step S33, the target evaporation temperature is set based on the pipe temperature and humidity obtained in step S32. Here, the condensation prevention target evaporation temperature T ₁ that starts the limiting operation of the compressor 33 when the evaporation temperature T _e does not reach that value, and the restriction of the compressor 33 when the evaporation temperature T _e exceeds that value Set the dew condensation prevention operation release temperature T ₂ to release the operation. The condensation prevention target evaporation temperature T _1, dew condensation prevention operation release temperature T ₂ in advance a function f of provided by which dew condensation prevention target evaporation temperature ₁ (T _o), the function f ₂ of the condensation prevention operation release temperature (T _o) Can be calculated respectively.

In step S34, it is determined whether or not the limited operation of the compressor 33 is necessary. Here, when the evaporation temperature T _e has not reached the dew condensation prevention target evaporation temperature T ₁ , it is judged that the limited operation of the compressor 33 is necessary, and step S
Move to 35. In step S35, the control frequency of the inverter circuit 54 that drives the compressor 33 is lowered to limit the operation of the compressor 33. In step S36, the evaporation temperature is detected again by the evaporation temperature sensor 73. Then, the process proceeds to step S34.

At step S34, the evaporation temperature T_eBut
Dew condensation prevention target evaporation temperature T₁If it is determined that
To move to step S37. In step S37,
It is determined whether or not the limited operation of the compressor 33 is released. This
Here, the evaporation temperature T_eAnd dew condensation prevention operation release temperature T₂And ratio
In comparison, the evaporation temperature T_eIs the dew condensation prevention operation release temperature T₂Beyond
If not, the process proceeds to step S36 and the current frequency
Continue to control the compressor 33 by the inverter circuit 54.
To go. In step S37, the evaporation temperature T _eDew
Preventive operation release temperature T₂If so, step S
Move to 38.

In step S38, when the compressor 33 is in the limited operation, this limitation is released and the control frequency of the inverter circuit 54 is increased. When the compressor 33 is not performing the limited operation, the control is continued at the same frequency. In step S39, it is determined whether or not there is an instruction to stop the dehumidifying operation. If an instruction to stop the operation is given from the remote controller, an indoor switch or another air conditioner, or if it is determined that the indoor humidity has reached the set humidity, it is considered that an instruction to stop the dehumidification operation is given, and the process proceeds to step S39. . In step S39, this dehumidifying operation is stopped.

FIG. 17 shows a time chart of this dehumidifying operation.
Shown in. <Effects of Third Embodiment> By making the indoor heat exchanger 16 act as an evaporator and the outdoor heat exchanger 36 as a condenser, the sucked outside air can be dehumidified and supplied to the indoor side, and the temperature of the piping part can be increased. Since the inverter frequency for the compressor 33 is changed according to the above, and the evaporation temperature of the outdoor heat exchanger 36 is controlled, the refrigerant temperature inside the refrigerant pipe and the ambient temperature at the connection portion with the communication pipe 25 of the indoor unit 1 are controlled. It is possible to reduce the difference between and to prevent dew condensation.

[Fourth Embodiment] <Refrigerant Circuit> FIG. 18 shows a refrigerant circuit according to a fourth embodiment. The same parts as those in the third embodiment are designated by the same reference numerals and the description thereof will be omitted. As in the second embodiment, the compressor 33 used in the fourth embodiment is not an inverter control type compressor but a refrigerator. A capacity control valve 81 is provided on the discharge side of the compressor 33, and a capacity control path 82 that short-circuits from the discharge side of the compressor 33 to the suction side is formed via the capacity control valve 81.

<Outdoor Unit Control Unit> The indoor unit control unit is the third
Since it is similar to the embodiment, its description is omitted. The control unit of the outdoor unit has a configuration as shown in FIG.
Here again, the same parts as those in the third embodiment are designated by the same reference numerals, and the description thereof will be omitted. Here, a capacity control valve drive unit 83 is provided in place of the inverter circuit 54 of the third embodiment. The displacement control valve drive unit 83 drives the actuator of the displacement control valve 81. By controlling the capacity control valve 81 by the capacity control valve drive unit 83, it is possible to distribute the capacity from the discharge side of the compressor 33 to the suction side and control the capacity of the compressor 33.

<Dehumidifying Operation> During the dehumidifying operation, control is performed based on the flowchart shown in FIG. In step S51, the refrigerant circuit is set and the dehumidifying operation is started. Here, the indoor heat exchanger 16 becomes an evaporator,
The four-way switching valve 34 so that the outdoor heat exchanger 36 functions as a condenser
To perform cooling operation. As a result, moisture can be removed from the outside air passing through the indoor heat exchanger 16, and dehumidified air can be supplied to the indoor side.

In step S52, the temperature and humidity of the piping and the evaporation temperature of the refrigerant in the outdoor heat exchanger 36 are detected.
As the piping temperature and humidity, the piping temperature and humidity T _o detected by the piping temperature sensor 71 and the piping humidity sensor 72 are used. Further, the evaporation temperature is used evaporation temperature T _e of the outdoor heat exchanger 36 to the evaporation temperature sensor 72 is detected. In step S53, the target evaporation temperature is set based on the pipe temperature and humidity obtained in step S52. Here, the condensation prevention target evaporation temperature T ₁ that starts the limiting operation of the compressor 33 when the evaporation temperature T _e does not reach that value, and the restriction of the compressor 33 when the evaporation temperature T _e exceeds that value Set the dew condensation prevention operation release temperature T ₂ to release the operation. The condensation prevention target evaporation temperature T _1, dew condensation prevention operation release temperature T ₂ in advance a function f of provided by which dew condensation prevention target evaporation temperature ₁ (T _o), the function f ₂ of the condensation prevention operation release temperature (T _o) Can be calculated respectively.

In step S54, it is determined whether or not the limited operation of the compressor 33 is necessary. Here, when the evaporation temperature T _e has not reached the dew condensation prevention target evaporation temperature T ₁ , it is judged that the limited operation of the compressor 33 is necessary, and step S
Move to 55. In step S55, the displacement control valve drive unit 83 controls the displacement control valve 81 to control the displacement of the compressor 33. In step S56, the evaporation temperature sensor 7
The evaporation temperature is detected again according to 3. Then, the process proceeds to step S54.

When it is determined in step S54 that the evaporation temperature T _e exceeds the condensation prevention target evaporation temperature T ₁ , the process proceeds to step S57. In step S57,
It is determined whether or not the limited operation of the compressor 33 is released. Here, the evaporation temperature T _e is compared with the dew condensation prevention operation release temperature T _2, and if the evaporation temperature T _e does not exceed the dew condensation prevention operation release temperature T ₂ , the process proceeds to step S56, and the operation is performed in the current state. continue. In step S57, the evaporation temperature T _e
Is above the dew condensation prevention operation release temperature T ₂ , the process proceeds to step S58.

In step S58, if the displacement control valve 81 is performing displacement control, this displacement control valve 81
Close and turn off the capacity control. When the limited operation of the compressor 33 is not being performed, the operation is continued as it is. In step S59, it is determined whether or not there is an instruction to stop the dehumidifying operation. When an instruction to stop the operation is given from the remote controller, the indoor switch, or another air conditioner, or when it is determined that the indoor humidity reaches the set humidity, it is considered that the instruction to stop the dehumidification operation is given, and the process proceeds to step S59. . In step S59, this dehumidifying operation is stopped.

FIG. 21 shows a time chart of this dehumidifying operation.
Shown in. <Effects of Fourth Embodiment> Similar to the third embodiment, the indoor heat exchanger 16 acts as an evaporator and the outdoor heat exchanger 36 acts as a condenser to dehumidify the sucked outside air to the indoor side. Since the capacity of the compressor 33 is controlled according to the temperature of the pipe portion, the difference between the refrigerant temperature inside the refrigerant pipe and the ambient temperature can be calculated at the connection portion with the communication pipe 25 of the indoor unit 1. It can be made smaller and can prevent dew condensation.

<Modifications of Third and Fourth Embodiments>
Instead of the pipe temperature sensor 71, a temperature sensor that detects the temperature of the ceiling above which the indoor unit 1 is installed and an outside air temperature sensor that detects the outside air temperature are provided, and the information of these temperature sensors is used as the pipe temperature. it is also possible to replace the humidity T _o.

[0064]

In the humidity control and ventilation system according to the present invention, the function of the compressor is restricted for a certain period of time after starting the humidification assist mode in which the indoor heat exchanger is used as the condenser to heat the refrigerant circuit. As a result, the condensation temperature of the compressor can be prevented from rising abnormally, and damage to the compressor can be prevented.

[Brief description of drawings]

FIG. 1 is a side sectional view of an indoor unit of a humidity control / ventilation apparatus to which an embodiment of the present invention is applied.

FIG. 2 is a plan sectional view thereof.

FIG. 3 is an explanatory perspective view of a communication pipe.

FIG. 4 is an explanatory diagram of a refrigerant circuit of the first embodiment.

FIG. 5 is a control block diagram showing an indoor unit control section of the first embodiment.

FIG. 6 is a control block diagram showing an outdoor unit control unit of the first embodiment.

FIG. 7 is a control flowchart showing a basic operation.

FIG. 8 is a control flowchart during a humidifying operation according to the first embodiment.

FIG. 9 is a time chart thereof.

FIG. 10 is an explanatory diagram of a refrigerant circuit according to a second embodiment.

FIG. 11 is a control block diagram showing an outdoor unit controller of the second embodiment.

FIG. 12 is a control flowchart of a humidifying operation according to the second embodiment.

FIG. 13 is a time chart thereof.

FIG. 14 is a control block diagram of an indoor unit controller according to the third embodiment.

FIG. 15 is a control block diagram of an outdoor unit controller according to a third embodiment.

FIG. 16 is a control flowchart of a dehumidifying operation of the third embodiment.

FIG. 17 is a time chart thereof.

FIG. 18 is an explanatory diagram of a refrigerant circuit according to a fourth embodiment.

FIG. 19 is a control block diagram of an outdoor unit controller according to the fourth embodiment.

FIG. 20 is a control flowchart of a dehumidifying operation of the fourth embodiment.

FIG. 21 is a time chart thereof.

[Explanation of symbols]

1 Indoor unit 2 Indoor unit casing 16 Indoor heat exchanger 19 humidifier 20 Air supply fan 22 Exhaust fan 25 Communication piping 31 outdoor unit 33 compressor 34 four-way switching valve 36 outdoor heat exchanger 37 Decompressor 54 Inverter circuit 61 Pressure control valve 71 Pipe temperature sensor 72 Piping part humidity sensor 73 Evaporation temperature sensor 81 Capacity control valve

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-4-106354 (JP, A) JP-A-3-168556 (JP, A) JP-A 2000-257936 (JP, A) JP-A-9-273782 (JP, A) JP-A-4-297741 (JP, A) JP-A-7-139836 (JP, A) JP-A-7-98159 (JP, A) (58) Fields investigated (Int. Cl. ⁷⁾ , DB name) F24F 11/02 102

Claims (5)

(57) [Claims] 1. An air supply path (RS) for supplying air from the outside to the inside of the room, and an exhaust path (RE) for discharging the room air to the outside of the room.
And an air supply fan (2) arranged in the air supply path (RS).
0) and an exhaust fan (2) disposed in the exhaust path (RE).
2), a humidifier (19) arranged in the air supply path (RS) for humidifying air from the outside, an indoor heat exchanger (16), a four-way switching valve (34), an accumulator (35). , Compressor (33), outdoor heat exchanger (3
6), a refrigerant circuit including a pressure reducer (37), and the indoor heat exchanger (16) of the refrigerant circuit includes the air supply path (R).
Humidity control ventilation provided with a humidification assist mode in which the indoor heat exchanger (16) is used as a condenser for heating operation of the refrigerant circuit when the humidification amount by the humidifier (19) is insufficient. A device for controlling humidity, wherein the function of the compressor (33) is limited for a certain period of time after starting the operation in the humidification assist mode. 2. A pressure control valve (61) provided on the discharge side of the compressor (33) and a short circuit between the discharge side and the suction side of the compressor (33) via the pressure control valve (61). And a pressure control path (62) for controlling the pressure control valve (61) for a certain period of time after starting the operation in the humidification assist mode to control the pressure of the compressor (33). The humidity control ventilation device according to claim 1. 3. An inverter circuit (54) for controlling the frequency of the compressor (33), wherein the frequency of the inverter circuit (54) is kept constant for a certain period of time after the operation in the humidification assist mode is started. The humidity control ventilation device according to claim 1, which is restricted to a low level. 4. The humidifier (19) is constructed by arranging a plurality of moisture permeable membrane pipes in parallel with each other and distributing humidifying water around the moisture permeable membrane pipes. The humidity control ventilator according to any one of claims 1 to 3, which is a moisture permeable membrane humidifier that humidifies air passing through the inside of the membrane pipe. 5. The air supply path (RS) and the exhaust path (RE)
The humidity control / ventilation device according to any one of claims 1 to 4, further comprising a sensible heat exchanger (17) disposed over the air passage and performing heat exchange between the air passing through the both paths.