JP2500074Y2 - Operation control device for air conditioner - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation control device for an air conditioner, and more particularly to operation control for a blower and a compressor when the thermostat is off.

[0002]

2. Description of the Related Art Generally, in an air conditioner, at least an air heat exchanger used for cooling air, and a blower having a variable air flow rate disposed on a secondary side (downstream side) of the air heat exchanger. During the cooling operation, when the intake air temperature is lower than the indoor set air temperature, it is turned off.When the thermostat is turned off, the amount of refrigerant circulation to the air heat exchanger is regulated while continuing the operation of the blower. ing.

[0003]

By the way, when the refrigerant circulation amount to the air heat exchanger is regulated when the thermostat is turned off during the cooling operation, the air passing through the air heat exchanger gradually warms up, and During the cooling operation, it is sucked into the blower that has been cooled by the cooling air, and the moisture in the air condenses on the blower. Will be done.

In that case, for example, the actual Kaihei 1-163755.
As disclosed in Japanese Patent Publication, an electric heater provided between an air heat exchanger and an air blower is operated at the same time as the thermostat is turned off to heat the air blower, thereby dew condensation on the air blower (condensed water). To prevent the dew condensation water from dripping inside the blower and the scattering of dew condensation water due to the wind pressure from the blower.

There is also a device provided with a dew condensation water scattering prevention member for preventing the dew condensation water from scattering by accumulating the dew condensation water dripping in the blower at the bottom of the blower on the downstream side of the blower.

However, in the above-mentioned one, an electric heater, a dew condensation preventing member, etc. are provided in order to prevent the dew condensation water from dripping in the blower or to prevent the dew condensation water from being scattered by the wind pressure from the blower. Since it is necessary to provide a separate member, there is a drawback that the cost is increased.

The present invention has been made in view of the above points, and an object of the present invention is to prevent the dew condensation water from dripping inside the blower and to prevent the dew condensation water from being scattered by the blower. By effectively controlling the amount of air blown, the cost is reduced.

[0008]

[Means for Solving the Problems] In order to achieve the above-mentioned object, the solution means taken by the present invention is at least an air heat exchanger (3) for cooling air, and the air heat exchanger (3). A compressor for circulating a refrigerant between the air heat exchanger and
An air blower (21) that is placed on the secondary side of (3) and that blows conditioned air from the air outlet (26b) and that has a variable air flow rate, and the indoor air intake temperature (T1) from the indoor set air temperature (T1) during cooling operation ( When T2) is higher, it is turned on and issues an ON operation signal, and the indoor air intake temperature (T2) is higher than the indoor set air temperature (T1).
When the temperature is lower, the thermostat outputs an OFF operation signal and starts operation when the thermostat starts OFF operation, and after the elapse of a predetermined required waiting time from when the compressor stops to when it restarts, the time A timer means for waiting for the compressor, which raises a time-up signal, and starts the operation when the thermostat is turned off, and time-up the time-up signal after the elapse of a predetermined blower regulation time shorter than the required waiting time. The blower regulation timer means for emitting the signal, the operation signal from the thermostat, the time-up signal from each timer means can be received, and when the OFF operation signal from the thermostat is received, the time from the compressor standby timer means is received. With the compressor stopped until the up signal is received, the blower (21) is operated at an extremely low When the dew condensation that has occurred on the blower (21) is evaporated while controlling the air volume and a time-up signal is received from the blower regulation timer means, the regulation of the blower (21) operation is released prior to restarting the compressor. And a control means (34) for restarting the compressor when a time-up signal from the compressor standby timer means is received. I am trying.

[0009]

With the above structure, in the present invention, when the indoor air intake temperature (T2) is lower than the indoor set air temperature (T1), it is turned off. When the thermostat is turned off, the compressor is stopped and the air heat exchanger is turned off. When the amount of refrigerant circulation to (3) is regulated, the air that has passed through the air heat exchanger (3) gradually returns to the room temperature, and this air is cooled by cooling air during the cooling operation (21). The water in the air adheres to the blower (21) to cause dew condensation. If so, blower (21)
Is from the start of the thermostat OFF operation until the blower regulation timer means transmits a time-up signal.
It is controlled by the control means (34) to operate at an extremely low air volume, and the air flowing through the blower (21) has an extremely low air velocity. For this reason, the condensed water adhering to the blower (21) may be dripped into the blower (21), or the blower (21) may be blown by the wind pressure of the blower (21).
1) Scattering outside is surely prevented, and this condensed water is gradually warmed up and evaporated during the blower regulation time.
In addition, even if the thermostat is off, the blower (21)
The indoor air is always sucked from the suction side of the air conditioner because the air conditioner is driven.Therefore, the sensor for detecting the indoor temperature always detects the indoor air suction temperature (T2) accurately. be able to. Further, even during the waiting time of the compressor, after the dew condensation of the blower (21) is evaporated, the amount of air blown by the blower (21) is increased, so that the air conditioning in the room is performed well.

[0010]

As described above, according to the operation control device of the air conditioner of the first aspect of the invention, when the OFF operation signal is received from the thermostat, the operation of the blower (21) is regulated to an ultra-low air volume. Therefore, the condensed water adhered to the blower (21) does not drip inside the blower (21) or is scattered by the wind pressure of the blower (21) to the outside of the blower (21). Since it slowly warms up and evaporates surely during a predetermined time, it is necessary to prevent the condensation water from dripping into the blower and to prevent the condensation water from scattering due to the wind pressure of the blower. A separate member such as an electric heater or a dew condensation water scattering prevention member is not required, so that the cost can be reduced. Also, turn off the thermostat
Since the blower (21) is driven even during operation, indoor air is always taken in from the intake side of the air conditioner, and therefore the indoor air intake temperature (T2) is always detected accurately. It is possible to accurately detect when the indoor air intake temperature (T2) is higher than the indoor set air temperature (T1), and to accurately perform the thermostat ON operation. It can be performed. Furthermore, in a state in which the compressor is stopped until it receives a time-up signal from the compressor standby timer means, after the operation of the blower (21) is regulated to an extremely low air volume, the blower ( Since the regulation of the operation of 21) is released and the amount of air blown by the blower (21) is increased, the return of the air blown into the room is quickly performed, and the air conditioning in the room can be satisfactorily performed.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show an air conditioner equipped with an operation control device according to an embodiment of the present invention, in which (A) is a ceiling-embedded indoor unit of the air conditioner.
The casing (1) of (A) is the oblong rectangular front plate (1a).
And a rear plate (1b) having a shape substantially corresponding to the front plate (1a), left and right side plates (1c), (1d) which are also in a horizontally long rectangular shape, and a substantially square upper plate (1e) And a bottom plate (1f), and is formed in a thin box type having a low height. On the back plate side in the casing (1), the air suction port (2) provided in the back plate (1b)
An indoor heat exchanger (3) as an air heat exchanger having the suction surface (3a) facing each other is vertically arranged. In addition, (4), ...
Is an air suction port mating flange for attaching a suction side passage (not shown) to the air suction port (2) of the casing (1).

The indoor heat exchanger (3) acts as an evaporator during the cooling operation, while acting as a condenser during the heating operation. Also, the indoor heat exchanger
(3) is a refrigerant contained in a compressor housed in an outdoor unit (not shown), an outdoor heat exchanger acting as a condenser during cooling operation, and the expansion valve (11) in the indoor unit (A). The refrigerant is circulated by 12). And the refrigerant pipe
In (12), the gaseous refrigerant compressed by the compressor during cooling operation is liquefied through the outdoor heat exchanger and then led to the indoor heat exchanger (3) as expanded liquefied refrigerant expanded by the expansion valve (11). Liquid side piping (13) provided in the indoor heat exchanger (3).
connected to a) and this indoor heat exchanger (3)
It is connected to the gas side pipe (13b) provided in the indoor heat exchanger (3) so that the gasified refrigerant is returned to the compressor again.

On the side of the front plate inside the casing (1), a blower (21) having a variable blow rate is arranged. The blower (21) includes a motor (23) having a shaft (22) extending in a direction orthogonal to the left and right side plates (1c), (1d) of the casing (1), and a shaft (22) of the motor (23). ) Mounted sirocco fan (24)
Consists of The motor (23) is attached to the front plate (1a) via a bracket (25) having a substantially U-shaped cross section. The sirocco fan (24) is housed in a fan casing (26), and the fan casing (26) has suction ports that oppose the left and right side plates (1c), (1d) of the casing (1), respectively. The opening (26a) is provided, and the air outlet (26b) facing the air outlet (27) provided on the front plate (1a) of the casing (1) is also opened. Then, the air sucked from the air suction port (2) of the front plate (1a) of the casing (1) by the sirocco fan (24) is cooled through the indoor heat exchanger (3), and then the indoor heat exchanger (3) is cooled. Heat exchanger
The suction port (26a) of the fan casing (26) of the blower (21) located on the secondary side (downstream side) of (3) sucks the air from the outlet (2).
It will be blown out from the air outlet (27) via 6b). A drain pan (28) is provided below the refrigerant pipe (12) in the indoor heat exchanger (3) and the casing (1), and the drain pan (28) has an indoor heat exchanger.
Water in the air cooled by (3) is stored as drain water, and the drain water is stored in the casing (1) via a pipe (not shown) connected to the drain socket (29) provided at the lower end of the casing. It is designed to be discharged outside. Incidentally, (33)
Is an air outlet joint flange for attaching an outlet passage (not shown) to the air outlet (27) of the casing (1).

Further, the left side plate of the casing (1)
A switch box (31) is attached to (1c) (lower side in FIG. 1). The switch box (31) has an operation / stop changeover switch for selectively changing the operation operation or the stop operation of an air conditioner (not shown), and the indoor heat exchanger (3) is controlled by the capacity control of the compressor in the outdoor unit. The blower (2) is controlled via the indoor heat exchanger (3) by controlling the circulation amount of the delivered refrigerant.
According to 1), the indoor set temperature switch for manually setting the indoor set air temperature (T1) based on the indoor set air volume blown into the room is provided. In addition, this device is equipped with the indoor set air temperature (T
1) and the indoor air intake temperature (T2) detected by the intake air temperature sensor (not shown) provided at the air intake port (2)
There is provided a thermostat (not shown) for operating or waiting (stopping) the compressor based on the above. The thermostat is turned on when the indoor air intake temperature (T2) is higher than the indoor set air temperature (T1) during the cooling operation of the air conditioner, while the thermostat is turned on when the indoor air intake temperature (T1) is exceeded. When (T2) is lower, it operates to turn off. The thermostat is configured to stop the compressor or operate the compressor at a low capacity when the air conditioner is turned off during the cooling operation of the air conditioner to regulate the refrigerant circulation amount to the indoor heat exchanger (3).

Then, ON / from the thermostat
The OFF operation signal is input to the control unit (34) as a control means configured by using a microcomputer. In addition, the control unit (3
In 4), the operation / stop signal from the operation / stop changeover switch in the switch box (31) and the operation signal from the protection device (not shown) that guarantees the performance of each device of the air conditioner, An abnormality signal from an abnormality detection device (not shown) that detects the occurrence of an abnormality in each device of the air conditioner is input. In addition, the motor (23) of the blower (21) is provided with a blower (21) via the indoor heat exchanger (3) so that the temperature of the room becomes the indoor set air temperature set by the indoor set temperature switch.
The indoor set air volume (air flow rate) blown out by is controlled by the control unit (34), and the air flow rate by the blower (21) is controlled by the control unit (34) when the thermostat is turned off. There is.

Next, the control of the blower (21) (motor (23)) by the control unit (34) will be described with reference to the flow chart shown in FIG. In this flow, control of the motor (23) during the cooling operation of the air conditioner will be described.

First, in step S1, it is confirmed that the air conditioner is in a stopped state, that is, the signal from the operation / stop changeover switch in the switch box (31) is a stop signal. Set the set air temperature (T1) and start the cooling operation of the air conditioner. Next, in step S3, the blower (21) is operated at an indoor set air volume (set air volume) that brings the indoor temperature close to the indoor set air temperature (T1) in step S2. After that, in step S4, it is determined whether or not the required waiting time from the last time the compressor is stopped to be restarted has not elapsed, and whether or not the compressor is in a standby state. In step S5, set the indoor air temperature (T
Determine the ON operating condition of the thermostat, which has a higher indoor air intake temperature (T2) than 1). Then, the above step S5
Is judged from the indoor set air temperature (T1) to the indoor air intake temperature (T
In the case of NO, which is a lower thermostat OFF operating condition, 2) waits until the thermostat reaches the ON operating condition, while the indoor air suction temperature (T2) is higher than the indoor set air temperature (T1). O
If YES, which is the N operating condition, the compressor is operated in step S6.

Next, in step S7, the thermostat OFF operation condition in which the indoor air intake temperature (T2) is lower than the indoor set air temperature (T1) is judged, and this judgment is made based on the indoor air temperature (T1). In the case of NO, which is the ON operating condition of the thermostat having the higher intake temperature (T2), the control waits until the indoor operating temperature of the thermostat is lower than the indoor set air temperature (T1). On the other hand, if the determination in step S7 is YES, which is the thermostat OFF operation condition in which the indoor air intake temperature (T2) is lower than the indoor set air temperature (T1), the compressor is stopped in step S8 for 3 minutes. The air blower (21) is controlled to stand by and the blower (21) is controlled to have an extremely low air flow, and in step S9, the timer of the compressor (compressor standby timer means) that causes the compressor to wait for 3 minutes is started and The timer (blower regulation timer means) of the blower (21) that sets the air volume to an ultra-low volume for 2 minutes is started.

Thereafter, in step S10, it is determined whether or not the timer of the blower (21) for making the blown air amount to be an extremely low air flow rate in step S8 has expired after 2 minutes, and the timer of the blower (21) is judged. If the timer is still running for less than 2 minutes, the process waits until the time is up, while if the timer of the blower (21) is 2 minutes and the time is up, the blower is determined in step S11. (21) is controlled by the amount of air blown before the thermostat reaches the OFF operation condition. Next, in step S12, the indoor set air temperature
The room air intake temperature (T2) is higher than (T1). It is judged whether the thermostat is ON and the compressor timer is up after 3 minutes. This judgment is the thermostat OFF operation condition. And, if the timer of the compressor has not elapsed for 3 minutes and the timer continues, in the case of NO, while the thermostat is in the ON operating condition and waits until the timer of the compressor is up, the thermostat is in the ON operating condition. And if the timer of the compressor has passed 3 minutes and the time is up, in the case of YES, step
In S13, operate the blower (21) with the indoor set air volume so that the indoor temperature approaches the indoor set air temperature (T1), and
Repeat returning to S6.

In this case, at least one of the stop signal from the operation / stop changeover switch in the switch box (31), the operation signal from the protection device, and the abnormality signal from the abnormality detection device is the control unit (34). When the signal is input to the input terminal, the control of the flow is stopped when the signal is input.

Therefore, in the above embodiment, when the indoor air intake temperature (T2) is lower than the indoor set air temperature (T1), the compressor is placed in a standby state when the thermostat is turned off. When the amount of refrigerant circulation to the air conditioner (3) is regulated, the air through the indoor heat exchanger (3) gradually warms up, and this air is cooled by the cooling air through the indoor heat exchanger (3). 21) Fan casing (2
6) The water in the air is sucked into the fan casing.
(26) and sirocco fan (24) will attach and dew. In that case, the blower (21) is the control unit from the start of the thermostat OFF operation until 2 minutes elapse.
Since it is controlled by the (34) to operate at an ultra-low speed, the condensed water adhering to the fan casing (26) and the sirocco fan (24) is discharged from the blower (21) controlled by the control unit (34). Since the air has an extremely low air volume, it is reliably prevented from dropping into the fan casing (26) or being scattered outside the fan casing (26) by the wind pressure from the sirocco fan (24). In addition, this condensed water
It is slowly warmed up and evaporated by the ultra-low air volume within 2 minutes. As a result, as in the conventional case, the electric heater and the dew condensation preventing member required to prevent the dew condensation from dropping into the fan casing and to prevent the dew condensation from being scattered by the wind pressure of the sirocco fan. Therefore, a separate member such as is unnecessary, and thus cost can be reduced.

Further, in the above embodiment, the compressor is made to stand by for 3 minutes when the thermostat is off, but when the thermostat is off, the compressor is turned on.
You may make it wait for a minute or more.

[Brief description of drawings]

FIG. 1 is a plan view showing the inside of an indoor unit.

FIG. 2 is a side view according to FIG.

FIG. 3 is a rear view according to FIG.

FIG. 4 is a flowchart showing control of a blower and a compressor by a control unit.

[Explanation of symbols]

 (3) Indoor heat exchanger (air heat exchanger) (21) Blower (34) Control unit (control means) (T1) Indoor set air temperature (T2) Indoor air intake temperature (26b) Air outlet

Claims (1)

(57) [Scope of utility model registration request] 1. A compressor for circulating a refrigerant between at least an air heat exchanger (3) used for cooling air and the air heat exchanger (3).
When disposed on the secondary side of the air heat exchanger (3), blowing conditioned air from the outlet (26b) air volume variable air blower (21), during cooling operation, the indoor set air temperature (T1 )
When the air intake temperature (T2) is higher, it is turned on and turned on.
When the indoor air intake temperature (T2) is lower than the indoor set air temperature (T1), it is turned off and O
A thermostat that issues an FF actuation signal , and starts the actuation when the thermostat turns off .
Predetermined required waiting time between when the compressor stops and when it restarts
After a lapse of time, it will time up and issue a time-up signal.
Starts operation when the compressor standby timer means and the above-mentioned thermostat OFF operation start
However, a predetermined blower regulation time shorter than the above required waiting time
And the time-up signal is issued after the
Blower regulation timer means , operation signal from the thermostat, from each timer means
, Which can receive the time-up signal of
Compressor standby timer when receiving an OFF operation signal from the controller
Stop the compressor until receiving the time-up signal from the means
In this condition, the blower (21) operation is regulated to an ultra-low air volume.
While controlling the air, the condensation generated in the blower (21) is evaporated and the air is blown.
Receives time-up signal from machine control timer means
And regulation of the operation of the blower (21) prior to restarting the compressor
To increase the amount of air blown by the blower (21), and then
Receives the time-up signal from the compressor standby timer means
Then, the operation control device of the air conditioner , comprising: a control means (34) that enables restarting of the compressor .