JP2702777B2 - Air conditioner - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a duct type air conditioner that controls room temperature by controlling the air flow to each room to be air-conditioned.

2. Description of the Related Art In recent buildings and condominiums, individual air conditioning systems have been widely used due to their energy saving properties. Among them, a variable air volume unit that controls the air volume supplied to each room to be air-conditioned and controls room temperature is used. Duct type air conditioners are often used.

 Hereinafter, a conventional example will be described with reference to the drawings.

FIG. 3 is a schematic diagram showing an example of a conventional air conditioner. Reference numeral 1 denotes an indoor unit main body, an indoor side blower 2 therein, a blower controller 2a for controlling the rotation speed of the indoor side blower 2,
An indoor heat exchanger 3 and an indoor electric expansion valve 4 for expanding a refrigerant are provided. 5 is an outdoor unit main body and has a compressor 6 inside.
An outdoor heat exchanger 7, an outdoor blower 8, and an outdoor electric expansion valve 9 are provided. Also, a compressor controller 10 for controlling the number of rotations of the compressor 6, an indoor electric expansion valve 4, and an outdoor electric expansion valve 9
And a capacity controller 12 having an electric expansion valve controller 11 for controlling the opening degree of the motor.

A duct 14 is provided from the indoor side blower 2 to the branch chamber 13, and each of the air-conditioned rooms is provided from the branch chamber 13.
Branch ducts 18, 19 and 20 are arranged to 15, 16 and 17, respectively. In the middle of the branch ducts 18, 19, 20, variable air volume units 21, 22, 23 are attached, respectively. The variable air volume units 21, 22, and 23 have dampers 21a, 22a, and 23, respectively, therein.
a and the motors 21b, 22 for driving the dambars 21a, 22a, 23a
b, 23b and an air volume controller for controlling the motors 21a, 22a, 23a
21c, 22c and 23c are provided. The air-conditioned rooms 15, 16, 1
7, a temperature controller 24, 25, 2 having an indoor temperature setting device 24a, 25a, 26a and an indoor temperature detector 24b, 25b, 26b therein.
6 are arranged.

The branch chamber 13 is provided with a duct temperature detector 27 and a pressure detector 28 for detecting an external static pressure, and a duct temperature for setting a set temperature to be constant during cooling and during heating, respectively. A setting device 27a and a pressure setting device 28a are provided.

 Next, the operation will be described.

The indoor unit main body 1 and the outdoor unit main body 5 are connected to form a well-known refrigeration circuit, and warm air or cold air blown from the indoor unit main body 1 passes through the duct 14 and passes through the branch chamber 13. After being diverted, they are led to the air-conditioned rooms 15, 16, 17 by branch ducts 18, 19, 20. Branch duct 18,1
Variable air volume units 21, 22, 23 provided in the middle of 9, 20
Are the indoor temperature setting devices 24a, 24a in the temperature controllers 24, 25, 26.
The temperature set by 25a, 26a and the indoor temperature detector 24b, 25
b, 26b, the air flow controller 21c, 2
The motors 21b, 22b, 23b are driven via the
The opening degrees of 1a, 22a, and 23a are changed to change the passing air volume.

When the air volume changes in the variable air volume units 21, 22, and 23, the external static pressure inside the branch chamber 13 changes, and the change is captured by the pressure detector 28 and the blower controller 2a
In order to set the external static pressure to the value set by the pressure setting device 28a, the rotation speed of the indoor blower 2 is controlled.

When the external static pressure returns to a constant value, the temperature in the branch chamber 13 changes with the change in the air volume.The temperature change is detected by the temperature detector 27 in the duct, and the temperature inside the duct is constant during operation. The rotation speed of the compressor 6 is controlled by the compressor controller 10 in the capacity controller 12 in order to set the temperature in the temperature setter 27a. Further, the electric expansion valve controller 11 controls the respective valve openings of the indoor electric expansion valve 4 in the indoor unit main body 1 and the outdoor electric expansion valve 9 in the outdoor unit main body 5, and an optimal system at that time. The refrigerant circulation amount is controlled so that

However, in the above-described conventional configuration, all the dampers 21a, 22a, and 23a inside the variable air volume units 21, 22, and 23 are closed,
When the passing air volume becomes 0, the heating operation is continued even though heating is not necessary, so that there is a disadvantage that unnecessary energy is consumed.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a variable air volume type air conditioner having a function of stopping a heating operation when a variable air volume unit is fully closed during a heating operation.

Means for Solving the Problems In order to achieve this object, the air conditioner of the present invention, in addition to the related art, has a refrigerant pressure detector for detecting a refrigerant pressure on a discharge side of a compressor, and an operation time of the compressor. has a compressor timer for accumulating, if the refrigerant pressure on the discharge side of the compressor becomes a predetermined pressure K ₁ or more, the operation of the compressor is stopped, if then the refrigerant pressure becomes K ₂ below compressor the causes are operated again, to start the compressor timer, until the count of the compressor timer reaches a predetermined time, reach the predetermined pressure _{K 3 (K 2 <K 3} <K 1) refrigerant pressure by the refrigerant pressure detector If it detects that the compressor has
The static pressure in the duct detected by the pressure detector does not start the compressor again.

Operation With this configuration, it is possible to detect an increase in the refrigerant pressure on the discharge side of the compressor within a predetermined time. Therefore, during the heating operation, the variable air volume unit is completely closed, the passing air volume becomes zero, and the indoor heat exchanger is heated. When the replacement cannot be performed, the heating operation is immediately stopped upon detecting a rise in the refrigerant pressure on the discharge side of the compressor, so that unnecessary energy consumption can be eliminated.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

 FIG. 1 is a schematic view showing the configuration of an embodiment of the present invention.

Components having the same configuration as the conventional example are denoted by the same reference numerals, and detailed description is omitted.

In one embodiment of the present invention, as compared with the conventional example, an outdoor air temperature detector 29 for detecting the air temperature around the outdoor unit main body, a refrigerant pressure detector 30 for detecting the refrigerant pressure on the discharge side of the compressor, and a compressor. The compressor includes a compressor timer 31 for accumulating the operation time of the compressor, and a storage device with a delay timer 32 for storing a detection value of the pressure detector 28 after completion of the count of the delay timer.

Next, the operation will be described. Except for the control when the variable air volume unit is fully closed during the heating operation, the control and the basic operation at the time of the normal operation are the same as those of the conventional example, and the description is omitted.

FIG. 2 is a flowchart showing control when the variable air volume unit is fully closed during the heating operation.

First, if it is detected in step 1 that the heating operation is being performed, it is determined in step 2 whether or not the compressor 6 is operating. If the compressor 6 is in operation, the compressor timer 31 is started in step 3 to perform compression. The accumulation of the operation time of the machine 6 is started. Then, in step 4, the discharge-side refrigerant pressure Y _{1 of the} compressor 6
(Kg / cm ² ) is detected by the refrigerant pressure detector 30, and in step 5, the air temperature around the outdoor unit main body 5, that is, the outdoor air temperature X
(° C.) is detected by the outdoor unit temperature detector 29. In step 6, the temperature is compared with a predetermined temperature T _O (° C.). If X ≧ T _O is detected, the process proceeds to step 7. In step 7, the pressure is compared with a predetermined pressure K ₁ (kg / cm ² ), and Y ₁ ≧ K _{If 1} is detected, the routine proceeds to step 8, where the compressor timer 31 is stopped, and in step 9, the compressor 6 is stopped. In step 10, the refrigerant pressure Y ₂ (kg / cm ² ) is detected in the same manner as in step 4, and in step 11, the refrigerant pressure Y ₂ is compared with a predetermined pressure K ₂ (kg / cm ² ) lower than K ₁ to determine Y ₂ K ₂ . Step 10 is repeated until a detection is made. If detecting the Y ₂ ≦ K ₂ in step 11, resets the compressor timer 31 proceeds to step 12, the compressor 6 F _O by the compressor controller 10 at step 13
(Hz) and compressor timer 31 in step 14
Start. In step 15, the refrigerant pressure Y ₃ (kg / cm ² ) is detected in the same manner as in step 4, and in step 16, it is compared with a predetermined pressure K ₃ (kg / cm ² ) (K ₂ <K ₃ <K ₁ ). , Y ₃ ≧ K ₃ , the process proceeds to step 19. If Y ₃ ≧ K ₃ is not detected in step 16, the process proceeds to the next step 17, and the compressor timer
If the count of 31 has not reached M _O (minutes), step
15 to 17 will be repeated. If the count of the compressor timer has reached M _O (minutes) at step 17, the process returns to step 4. If X ≧ T _O is not detected in Step 6, the process proceeds to Step 18. If Y ₁ ≧ K ₂ is detected, the process proceeds to Step 18.
After stopping the compressor timer 31 in step 19,
At 20, the compressor 6 is stopped, and at step 21, the number of revolutions of the indoor blower is set to Z _O (Hz). In step 22, the delay timer of the storage device with delay timer 32 is started, and if the count of the delay timer is detected in step 23, the delay timer is reset in step 24. In step 25, the external static pressure P _O (mmH ₂ O) in the branch chamber 13 is detected by the pressure detector 28, and in step 26, it is stored in the storage device 32 with a delay timer. Then similar to step 25 at step 27 to detect the external static pressure P (mmH ₂ O), external static pressure P _O and stored into the delay timer with storage device 32 at step 28 (mmH
If detecting the ₂ O) as compared to P _O prescribed than the pressure A (mmH ₂ O) or lower external static pressure P (mmH ₂ O), it resets the compressor timer 31 at step 29, step 30 At step 31, the indoor blower 2 is returned to the control during the normal operation, and at step 31, the compressor 6 is returned to the control during the normal operation. In step 7, Y ₁ ≧
In the case where K ₁ is not detected and the case where Y ₁ ≧ K ₂ is not detected in step 18, the compressor 6
Is returned to the control during normal operation. Even when the compressor 6 is stopped by the control during the normal operation, the compressor timer 31 is reset in step 32. The count is not completed.

As described above, according to the present embodiment, the refrigerant pressure detector 30
And that the variable air volume unit is fully closed during the heating operation by providing the compressor timer 31.
The refrigerant pressure on the discharge side of the compressor 6 within a predetermined time period of the re-operation time of the compressor 6 after the refrigerant pressure on the discharge side of the compressor 6 becomes higher than the predetermined pressure K ₁ (kg / cm ² ) and the operation of the compressor 6 is stopped Is detected when the pressure becomes equal to or higher than a predetermined pressure K ₃ (kg / cm ² ), and the compressor 6 and the indoor blower 2 are controlled, so that unnecessary energy consumption can be eliminated.

The present invention as described above the effect of the invention, the refrigerant pressure detector, by providing the compressor timer, variable air volume unit during the heating operation when the fully closed, the refrigerant pressure reaches a predetermined pressure K ₁ becomes compressor Detects when the refrigerant pressure exceeds a predetermined pressure K ₃ (predetermined pressure K ₃ <predetermined pressure K ₁ ) within a predetermined time of compressor re-operation after the operation is stopped, and controls the compressor and the indoor blower. Therefore, it is possible to realize an excellent variable air volume type air conditioner that can eliminate unnecessary energy consumption of continuing heating operation even though heating is unnecessary.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a configuration of an air conditioner according to an embodiment of the present invention, FIG. 2 is a flowchart showing an example of control when a variable air volume unit is fully closed during a heating operation, and FIG. It is a schematic diagram of a structure of a harmonic machine. DESCRIPTION OF SYMBOLS 1 ... indoor unit main body, 2 ... indoor side blower, 3 ... indoor side heat exchanger, 5 ... outdoor unit main body, 6 ... compressor, 7 ... outdoor heat exchanger, 8 ... outdoor blower, 14 ... duct, 1
5,16,17… Air-conditioned room, 21,22,23 …… Variable air volume unit, 28… Pressure detector, 30 …… Refrigerant pressure detector, 31…
Compressor timer.

Claims (1)

(57) [Claims] 1. A duct-connected indoor unit body having an indoor heat exchanger and an indoor blower having a rotation speed control device therein, a compressor having a rotation speed control device, an outdoor heat exchanger,
An outdoor unit main body having an outdoor blower, a duct for guiding cool air or hot air from the indoor unit main body to the room to be air-conditioned, a variable air volume unit in the duct that varies an air volume according to a room temperature of the air-conditioned room, and the duct A pressure detector for detecting a static pressure, a refrigerant pressure detector for detecting a refrigerant pressure on a discharge side of the compressor, and a compressor timer for accumulating an operation time of the compressor. during operation, when the detected pressure of the refrigerant pressure detector becomes a predetermined pressure K ₁ or more, the compressor is stopped, then, if the detected pressure becomes K ₂ or less, re-operating the compressor again The compressor timer is started, and when a predetermined pressure K ₃ (K ₂ <K ₃ <K ₁ ) is detected by the refrigerant pressure detector before the compressor timer elapses a predetermined time, the compression is started. Stop the machine again An air conditioner, wherein the compressor is not started to restart until the static pressure in the duct detected by the pressure detector drops to a predetermined value from the time when the compressor is stopped again. .