JPH028644A - Operation control device for air conditioner - Google Patents

Abstract

PURPOSE:To keep a comfortable air conditioned state by a method wherein a changing-over range of an operating condition is varied to have a high degree when an installing place of means for detecting an air temperature is placed at an air suction port of an air conditioning device and in turn the range is varied to have a lower value in case that the installing place is in a room. CONSTITUTION:When a thermistor TH is placed at an air suction side, a set value DELTAT1 in a first setting circuit 16 is inputted to CPU 15 through a changing- over switch 18. Under a condition in which a thermostat is ON, a room temperature thermostat is changed over to a thermo-OFF state when an absolute value of a difference between an indoor air temperature Ta and a set temperature Ta reaches more than the set value DELTAT1 and then a compressor 1 is stopped. Also in case that it is changed over to the thermo-ON, it is changed over when the absolute value of a difference between the air temperature Ta and the set temperature Ts is more than the set value DELTAT1. In case that a thermistor TH is placed at a wall surface of a room and the like, a set value DELTAT2 in the second setting unit 17 is inputted to the CPU 15 and an operating condition of the device is changed over alternatively under an action of the above- mentioned manner. And, a relation of DELTAT1>DELTAT2 is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an operation control device for an air conditioner, and particularly to one that performs operation control in response to a short circuit of blown air to the suction side.

(Prior art) Conventionally, in devices where the air outlet and the suction port are close to each other, such as a Tenri type air conditioner, a part of the blown air is sucked in from the suction port without circulating inside the room. It is well known that so-called short circuits occur. In that case, if the thermistor of the room temperature thermostat is attached to the air suction port of the main body of the device, as shown in Figure 7, when the device transitions from the thermo-on state to the thermo-off state during heating operation, the room temperature will drop to Since the air temperature is not rising, it suddenly decreases by the specified temperature (see ■ in the figure); conversely, when transitioning from the thermo-off state to the thermo-on state, the intake air suddenly decreases due to a short circuit in the blown air. Although the temperature rises (see ■ in the figure), the actual room temperature does not rise that much.

Therefore, a large temperature difference is created in the membrane between the temperature at which the operating state is switched, that is, the temperature at which the thermo-on state is switched to the thermo-off state, and the temperature at which the thermo-off state is switched from the thermo-on state. being done. That is, as shown in FIG. 9, for example, the operation is such that the thermostat is turned off at a temperature higher than the set temperature Ts by a predetermined switching width Δt, and switched to the thermostat ON state at a temperature lower than the set temperature Ts by Δt. When providing a predetermined differential depending on the direction of state switching, the switching width Δt
is set to a large value, for example, about 1° C., in order to suppress the effects of the short circuit described above. Note that during cooling operation, the temperature relationship is reversed and switched.

(Problem to be Solved by the Invention) By the way, when actually installing an air conditioner, the thermistor is not necessarily installed at the air intake port as described above, but may be installed in a part of the room away from the main body of the device. There is also. In such a case, as shown in Figure 8,
Even when switching between the on state and the thermo-off state, a sudden temperature change as shown in FIG. 6 does not occur, and the indoor air temperature changes gradually.

However, even in such a case, if a large switching width Δt as described above is provided, an unnecessarily large temperature change will be required to return from the thermo-off state to the thermo-on state, for example. The comfortable feeling of air conditioning will be lost.

The present invention has been made in view of these points, and its purpose is to make the time required for switching the operating state almost the same regardless of the installation location of a sensor for detecting indoor air temperature such as a thermistor. The aim is to maintain a comfortable air-conditioned feeling by taking measures.

(Means for Solving the Problem) In order to achieve the above object, the solution of the present invention is to change the switching width of the operating state depending on the mounting position of the sensor for detecting the indoor air temperature.

Specifically, the first solution is as shown in FIG.
An air conditioner is assumed to be equipped with a refrigerant circulation circuit (7) formed by sequentially connecting a compressor (1), an outdoor heat exchanger (3), a pressure reduction mechanism (4), and an indoor heat exchanger (5).

The operation control device for the air conditioner includes an air temperature detection means (TH) that detects the indoor air temperature, and an absolute value of the deviation between the indoor temperature detected by the air temperature detection means (TH) and the set temperature. exceeds the switching width, the operating state of the device can be selected between a thermo-on state in which the refrigerant circulation circuit (7) is in operation and a thermo-off state in which the refrigerant circulation circuit (7) is in a stopped state. The switching width of the operating state is controlled by the air temperature detecting means (T
H) is large when the installation location is the air intake port of the device,
Switching width changing means (18) that changes the width to a smaller size when indoors
It has been established that

The second solution, as shown in FIG. What is the indoor temperature and setting detected by the air temperature detection means (TH)?
When the absolute value of the deviation from H degree exceeds the switching width, the operating status of the device is changed to the thermo-on state where the refrigerant circulation circuit (7) is in operation and the thermo-on state where the refrigerant circulation circuit (7) is in the stopped state. Operation control means (1
5), a temperature change detection means (19) for detecting a change in air temperature detected by the air temperature detection means (TH) when the operating state is switched by the operation control means (15); Switching width changing means (18') receiving the output of the means (19) and changing the switching width of the operating state to a larger value when the temperature change is large and to a smaller value when the temperature change is small.
It has been established that

(Function) With the above configuration, in the invention of claim (1), the operation control means (15) controls the compressor (1) when the thermostat is on.
is activated, and a thermo-on operation is performed in which refrigerant circulates through the refrigerant circulation circuit (7). When the indoor air temperature changes from the set value by more than a predetermined switching width, the thermo-on operation is performed, and the compressor switches to the thermo-off state. (1) is stopped and a thermo-off operation is performed in which refrigerant is not circulated in the refrigerant circulation circuit (7). Next, when the thermo-off operation is performed and the air temperature changes in the opposite direction from the set value by more than the switching width, the thermo-on state is switched again and the thermo-on operation is performed.

In that case, the switching width changing means (18) greatly changes the switching width when the air temperature detecting means (TH) is attached to the air suction port (11), so that the actual indoor Temperature control adapted to the actual room temperature is performed by correcting the difference between the temperature and the intake air temperature.

On the other hand, 1. When the switch is mounted in a remote location such as on a wall in a room, the switching width is changed to a smaller value, so temperature control is performed immediately in response to changes in the room temperature. Therefore, by installing the air temperature detection means (TH), it is possible to obtain a comfortable air conditioning effect depending on the location.

Further, the invention of claim (2) performs the same switching of the operating state as the invention of claim (1), and also detects the temperature change detected by the temperature change detection means (19) at the time of switching the operating state. , the location of the air temperature detection means (TH) is detected, and the switching width is changed to a larger value when the temperature change is large and to a smaller value when the temperature change is small. The same effect as the invention of item (1) can be obtained.

(Example) Hereinafter, an example of the present invention will be described based on the drawings of FIGS. 2 to 6.

FIG. 2 shows the overall configuration of a ceiling-embedded air conditioner according to an embodiment of the invention of claim (1), in which (A) is an outdoor unit, (B) is an indoor unit, and the outdoor unit (
A) includes a compressor (1), a four-way switching valve (2) that switches as shown in the solid line in the figure during cooling operation and as shown in the broken line in the figure during heating operation, a condenser during cooling operation, and a four-way switching valve (2) that switches as shown in the broken line in the figure during heating operation. An outdoor heat exchanger (3) serving as an evaporator is built-in, while the indoor unit (B) has an electric expansion valve (4) as an expansion mechanism that expands the refrigerant, and an evaporator during cooling operation. , an indoor heat exchanger that serves as a condenser during heating operation (5)
and an indoor fan (5a) whose rotation speed is variably adjusted to change the air volume are built in as main equipment, and refrigerant can flow through the main equipment (1) to (5) above through refrigerant piping (6). are connected in order to form a refrigerant circulation circuit (7). Further, (8) is an indoor control unit for controlling the operation of the device from the indoor side, and (14) is a room temperature thermostat built into the indoor control unit (8) for adjusting the indoor temperature within a predetermined range. be.

As shown in FIG. 3, the indoor unit (B) is installed in a ceiling-embedded structure.

In other words, the indoor unit (B) includes the indoor heat exchanger (5) inside the casing (10) buried in the ceiling, and a sirocco-type indoor fan ( 5a), and the indoor fan (5a)
), the indoor air sucked in from the air suction port (11) provided near the center of the casing (10) is heat-exchanged by the indoor heat exchanger (5), and then the indoor air is heated by the indoor heat exchanger (5) provided at the lower left side of the casing (10). The air is blown into the room from the air outlet (12), and the air is blown into the casing (10) through a duct (not shown) that opens downstream of the indoor heat exchanger (5) and divides the flow.
Conditioned air is blown into the room from an air outlet (12) on the lower right side of the air conditioner.

Further, a thermistor (TH) is arranged as an air temperature detection means that is connected to the room temperature thermostat (14) so as to be able to input a signal and detects the indoor air temperature. The air conditioner can be installed at the - part of the air inlet (11) of the exchanger (5) (the position indicated by the broken line in the figure) or in a part of the room (not shown), and the installation of the air conditioner is sometimes done depending on the indoor situation. You can choose one depending on your situation.

Moreover, FIG. 4 shows the circuit configuration of the indoor control unit (8), where (15) receives the output of the thermistor (TH),
When the absolute value of the deviation between the indoor air temperature and the set temperature exceeds a predetermined switching width, the operating state of the device is switched between the thermo-on state in which the refrigerant circulation circuit (7) is in operation and the thermo-on state in which the refrigerant circulation circuit (7) is in operation. ) is in a stopped state and a thermo-off state.(16) is a CPU as an operation control means for controlling the operation of the air conditioner. The first switching width ΔT+ (for example, about 1°C) corresponding to the
The setting device (17) is the first switching width ΔT1 corresponding to when the thermistor (TH) is placed on the wall surface of the room, etc.
The second switching width ΔT2 is smaller than (e.g. 0.5℃
second setter for setting the degree) 1. (18) is manually performed in the above 1. The CPU (1) of the second setting device (16), (17)
5) is a changeover switch that selectively changes the connection to
It has a function as a switching width changing means that changes the installation location of the thermistor (air temperature detection means) (TH) to be large when the installation location is at the air suction port of the device, and small when it is installed indoors.

In Figure 2, during heating operation of the air conditioner, the compressor (
The gas refrigerant compressed by 1) is transferred to the indoor heat exchanger (5)
After being condensed and liquefied in the condenser (condenser), it is depressurized by the electric expansion valve (4), evaporated in the outdoor heat exchanger (3) (evaporator), and returned to the compressor (1) in a gaseous state. At that time, the indoor unit (
In B), the CPU (15) of the indoor control unit (8)
), the opening degree of the electric expansion valve (4) is controlled according to the indoor load represented by the deviation (Ts - Ta) between the indoor air temperature Ta detected by the thermistor (TH) and the set temperature Ts, The capacity of the indoor heat exchanger (5) is configured to be adjusted.

Next, to explain the operation of the air conditioner, when the thermistor (TH) is arranged at the air suction port (11), the setting value ΔT1 of the first setting circuit (16) is set by the changeover switch (18). It is connected to the CPU (15) so that it can be inputted, and as shown in FIG.
), the refrigerant circulates through the indoor air TH.
The degree Ta increases. Then, the indoor air temperature Ta rises, and the absolute value of the temperature deviation (Ts - Ta) becomes the first
When the switching width ΔT1 or more is reached, that is, when the air temperature Ta becomes higher than the set temperature by 617 or more, the room temperature thermostat (14) switches to the thermo-off side,
The compressor (1) is stopped and a thermo-off state is entered in which no refrigerant circulates in the refrigerant circulation circuit (7). However, the indoor fan (5a) continues to operate.

Next, the device is operated in the thermo-off state, the air temperature Ta decreases, and the first switching width Δ is set relative to the set temperature Ts.
When the temperature drops below T1, turn off the thermostat (14
) is switched to the thermo-on side, the compressor (1) is started, and the thermo-on state is established in which refrigerant flows into the refrigerant circulation circuit (7).

In other words, the temperature deviation between the air temperature Ta and the set temperature Ts (
When the absolute value of (Ta-Ts) exceeds the first switching width ΔT1, the operating state of the device is alternately switched between a thermo-on state and a thermo-off state.

In addition, when the thermistor (TH) is installed on the wall side of the room, the setting value of the second setting device (17) is input to the CPU (15) by the changeover switch (18), and the same as above is performed. As a result, as shown in Figure 5 (b), the temperature deviation (Ts - T
When the absolute value of a) exceeds the second switching width ΔT2, the operating state of the device is alternately switched between the thermo-on state and the thermo-off state.

Note that during cooling operation, the refrigerant circulation path is reversed to that described above, and the temperature at which the thermostat is switched to the thermo-on state and the thermostat-off state is reversed in height.

Therefore, in the above embodiment, the thermostat (TH)
is attached to the air suction port (11), the thermo-on state and thermo-off state can be switched mutually with the larger first switching width ΔT1, so that the blown air as shown in FIG. The sudden temperature change caused by a short circuit when switching operating conditions is corrected, and temperature control is performed that adapts to the actual indoor air temperature. On the other hand, if the thermistor (TH) is installed on a wall or the like in the room, it can be switched between the thermo-on state and the thermo-off state with a second switching width ΔT2 that is smaller than the first switching width ΔT1. , there is no delay in temperature control (see FIG. 8) unlike when the first switching width ΔT1 is used as is, and temperature control is performed immediately in response to the indoor air temperature. Therefore, depending on the mounting position of the thermistor (TH), comfortable temperature control can be performed.

Next, a second embodiment according to the invention of claim 2 will be explained. In the second embodiment as well, the overall configuration of the air conditioner and the configuration of the indoor heat exchanger (5) are the same as in the first embodiment. The same is true (see FIGS. 2 and 3).In the indoor control unit (8), as shown in FIG. 6, in place of the changeover switch (18) in the first embodiment,
A switching circuit that automatically switches depending on an electrical signal (1
8') are arranged. Further, an arithmetic unit (19) is arranged as a temperature change detection means that receives a signal from the thermistor (TH) and detects a change in air temperature when switching the operating state, and the signal of the arithmetic unit (19) is , can be input to the switching circuit (18').

In this example as well, the equipment operation and
The stopping operation is the same as in the first embodiment, but in particular, the position of the thermistor (TH) is automatically detected by the computing unit (19) based on the change in air temperature Ta when switching the operating state. Ru. That is, when the thermistor (TH) is arranged at the air suction port (11), when switching between the thermo-on state and the thermo-off state, the seventh
Figure ■.

A sudden temperature change occurs due to a short circuit of the blown air as shown in (2). On the other hand, if the thermistor (TH) is placed on a wall or the like in the room, such a rapid temperature change will not occur, as shown in FIG. Therefore, in accordance with the temperature change detected by the arithmetic unit (19), the switching circuit (18') adjusts the setting value of the first setting device (16), that is, the first setting value, when the humidity change is large.
When the switching width ΔT1 is small, the set value of the second setting 2a (17), that is, the second switching width ΔT2, is selected as the switching width for switching the operating state, and as in the first embodiment, the thermistor ( TH) installation will provide comfortable temperature control depending on the location. Therefore,
In the case of this embodiment, compared to the above-mentioned first embodiment, there is an advantage that when installing an air conditioner, there is no need to check the location of the thermistor (TH) and change the changeover switch (18) each time. be.

The present invention is applicable not only to the ceiling-embedded air conditioners of the above embodiments, but also to ceiling-suspended air conditioners, etc., in which the air outlet and the air intake are close to each other, causing a short circuit of the blown air. It can be applied to the type of air conditioner that occurs.

Further, the above embodiment is an example in which the present invention is applied to an air conditioner in which one indoor unit (B) is arranged for one outdoor unit (A).
It goes without saying that A) can also be applied to a multi-type air conditioner in which a large number of indoor units are arranged.

(Effects of the Invention) As explained above, according to the invention of claim (1), the air heating device is operated in thermo-on mode and thermo-off mode depending on the deviation between the indoor air temperature and the set temperature. The switching width for mutually switching the operating state can be changed to be larger when the air temperature detection means is placed at the air intake port, and smaller when it is placed indoors, so it is possible to change the switching width for mutually changing the operating state. It is possible to achieve a comfortable air conditioning effect by responding to the influence of the short circuit of the blown air, which changes accordingly.

Furthermore, in the invention of claim (2), the location of the temperature detection means is automatically detected from the temperature change at the time of switching the operating state and the switching width is changed. In addition to the effects of the invention, a comfortable air conditioning effect can be achieved without manually changing the switching width.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the structure of the invention of claims (1) and ('25). FIGS. 2 to 6 show embodiments of the invention,
FIG. 2 is a refrigerant system diagram of an air conditioner according to an embodiment of the invention of claims (1) and (2), FIG. The figure is an electric circuit diagram of the indoor control unit according to the embodiment of the invention of claim (1), and Figures 5 (a) and 5 (b) show the thermistor installed at the air intake port and the thermistor installed indoors, respectively. FIG. 6 is a diagram corresponding to FIG. 4 according to an embodiment of the invention of claim 2.
FIG. 7 and FIG. 8 are temperature change characteristic diagrams at the time of switching the operating state when the thermistor is installed in the air suction port and in the room, respectively. FIG. 9 is a diagram showing switching characteristics of operating conditions according to the conventional type. (1)... Compressor, (3)... Indoor heat exchanger, (4
)...Electric expansion valve (pressure reducer (I■), (5)...Indoor heat exchanger, (7)...Refrigerant circulation circuit, (15)...
・CPU (operation control means), (18)... Changeover switch (switching width changing means), (18')... Switching circuit (switching width changing means), (19)... Arithmetic unit (temperature change) (detection means), (TH)... thermistor (air temperature detection means). Patent applicant Daikin Industries, Ltd. 6 Figure 4 Figure 5 Figure 1 Figure 8 Figure Figure 8

Claims (2)

[Claims] (1) Compressor (1), outdoor heat exchanger (3), pressure reduction mechanism (
4) and an indoor heat exchanger (5) connected in sequence to form a refrigerant circulation circuit (7), the air temperature detection means (TH) for detecting indoor air temperature, and the air temperature detection means. When the absolute value of the deviation between the indoor temperature detected by (TH) and the set temperature exceeds the switching width, the operating state of the device is changed to the thermo-on state in which the refrigerant circulation circuit (7) is in operation and the refrigerant An operation control means (15) selectively switches between a thermo-off state in which the circulation circuit (7) is stopped, and an air temperature detection means (T) that controls the switching width of the operation state.
An operation control device for an air conditioner, characterized in that H) is provided with a switching width changing means (18) that changes the switching width to be large when the installation location is at the air intake port of the device and to be small when the installation location is indoors. (2) Compressor (1), outdoor heat exchanger (3), pressure reduction mechanism (
4) and an indoor heat exchanger (5) connected in sequence to form a refrigerant circulation circuit (7), the air temperature detection means (TH) for detecting indoor air temperature, and the air temperature detection means. When the absolute value of the deviation between the indoor temperature detected by (TH) and the set temperature exceeds the switching width, the operating state of the device is changed to the thermo-on state in which the refrigerant circulation circuit (7) is in operation and the refrigerant An operation control means (15) selectively switches between a thermo-off state in which the circulation circuit (7) is stopped, and when the operation control means (15) switches the operation state, the air temperature detection means (TH) A temperature change detection means (19) for detecting a change in the detected air temperature, and receiving the output of the temperature change detection means (19), determines the switching width of the operating state,
1. An operation control device for an air conditioner, comprising a switching width changing means (18') that changes the switching width to a large extent when the temperature change is large and to a small switching width when the temperature change is small.