JP3463447B2 - Control device for air conditioner - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an air conditioner equipped with a heat pump type refrigeration cycle, and more particularly, to reduce the number of heating high pressure overheat protection operations during heating operation and detect an abnormality in the refrigeration cycle. And what to display.

[0002]

2. Description of the Related Art Conventionally, as shown in the refrigeration cycle diagram of FIG. 1, a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a pressure reducer 4,
As shown in the block diagram of FIG. 7, the control device of the air conditioner including the heat pump refrigeration cycle in which the indoor heat exchanger 5 and the like are sequentially connected is an operation unit for inputting the indoor set temperature (Ts) and the like. 11, a display unit 12 that displays a set temperature and the like, and an indoor temperature detector 1 that detects an indoor temperature (Tr)
3, a pipe temperature detector 14 that detects a pipe temperature (Tp) of the indoor heat exchanger, an overload temperature storage unit 15 that stores a predetermined overload temperature (To), and a control unit 16 that controls each unit. A communication unit 17 that communicates with the outdoor control unit 30 and the outdoor control unit 30, and the control unit 16 inputs the indoor temperature (Tr) from the indoor temperature detector 13 and the indoor setting input from the operation unit 11. The operation of the compressor 1 and the blower fan 6 of the outdoor heat exchanger 3 are intermittently controlled according to the difference (load) from the temperature (Ts).

Further, when the refrigerant in the compressor 1 is in a shortage state, the high-pressure pressure becomes excessive during the heating operation, and when the pipe temperature (Tp) exceeds a predetermined overload temperature (To), the control unit 16 causes the above-mentioned. The outdoor control unit 30 via the communication unit 17
To control the blower fan 6 of the outdoor heat exchanger 3 and
The operation of the compressor 1 is stopped to perform the heating high pressure overheat protection operation. However, if the above-described heating high pressure overheat protection operation frequently occurs during the heating operation, there is a problem that not only the air conditioning efficiency is lowered but also the user is uncomfortable.

[0004]

SUMMARY OF THE INVENTION The present invention solves the problems described above, prevents frequent occurrence of heating high-voltage overheat protection operation during heating operation, and frequently causes heating high-voltage overheat protection operation. At times, it is an object of the present invention to provide a control device for an air conditioner that notifies a user of the occurrence of an abnormality and prompts a service call.

[0005]

In order to solve the above problems, the present invention provides a compressor, a four-way valve, an outdoor heat exchanger, a pressure reducer,
And a heat pump type refrigeration cycle in which an indoor heat exchanger and the like are sequentially connected, the operation section for inputting the indoor set temperature, etc. of the same refrigeration cycle, the display section for displaying the set temperature, etc., and the room for detecting the indoor temperature A temperature detector, a pipe temperature detector for detecting the pipe temperature of the indoor heat exchanger, an overload temperature storage unit for storing a predetermined overload temperature, a control unit for controlling each unit, and an outdoor control unit for communication. Controlled by a control unit composed of the communication unit and the outdoor control unit, which is usually controlled so as to intermittently operate the blower fan of the compressor and the outdoor heat exchanger according to the load, and during the heating operation, When the pipe temperature exceeds a predetermined overload temperature, the control unit controls the outdoor control unit via the communication unit to stop the operation of the blower fan of the outdoor heat exchanger and the compressor to perform heating. High-voltage overheat protection operation In the air conditioner, a first aspect of the present invention includes a first arithmetic unit that outputs a difference between a pipe temperature from the pipe temperature detector and an overload temperature from an overload temperature storage unit, and the pipe temperature detector. Second calculation unit for calculating the temporal change rate of the pipe temperature, and the air volume of the blower fan of the outdoor heat exchanger according to the difference between the temporal change rate of the pipe temperature and the predetermined overload temperature. And an air flow rate setting unit for setting the air flow rate control unit to control the air flow rate of the blower fan of the outdoor heat exchanger according to the difference between the temporal change rate of the pipe temperature and the predetermined overload temperature during heating operation. did.

A second aspect of the invention is a timer for measuring a predetermined time, a counter for counting the number of times of the heating high voltage overheat protection operation within the predetermined time, a number storage section for storing the predetermined number of times, and the counter. When the number of counts exceeds a predetermined number from the number storage unit, an abnormality detection unit that outputs an abnormality monitor output according to the count number is provided, and during heating operation,
When the number of heating high pressure overheating protection operations within the predetermined time exceeds a predetermined number, an abnormality of the refrigeration cycle is displayed on the display unit.

A third aspect of the invention is to provide a first arithmetic unit for outputting a difference between a pipe temperature from the pipe temperature detector and an overload temperature from an overload temperature storage unit, and a pipe from the pipe temperature detector. A second calculation unit that calculates a temporal change rate of temperature, and sets an air volume of a blower fan of the outdoor heat exchanger according to a difference between the temporal change rate of the pipe temperature and the predetermined overload temperature. An air flow rate setting unit, a timer for setting and measuring a predetermined time, a counter for counting the number of times of the heating high pressure overheat protection operation within the predetermined time, a number storage unit for storing the predetermined number of times, and a counter And an abnormality detection unit that outputs an abnormality monitor output when the number of counts exceeds a predetermined number from the number storage unit, and during heating operation, the difference between the temporal change rate of the pipe temperature and the predetermined overload temperature. Blower of the outdoor heat exchanger according to Controls the air volume of § down, the heating times of high excessive protection operation within the predetermined time has an abnormality of the refrigeration cycle exceeds the predetermined number of times to be displayed on the display unit.

Further, the second calculation unit includes a pipe temperature storage unit for temporarily storing the pipe temperature from the pipe temperature detector, a pipe temperature stored in the pipe temperature storage unit and the pipe temperature detector. It is composed of a comparison unit for comparing the pipe temperature.

Further, the air flow rate setting unit compares the value of the difference between the pipe temperature and the predetermined overload temperature with a predetermined difference value to determine the magnitude, and a time difference of the pipe temperature. It is configured by a change rate determination unit that compares the value of the change rate with a predetermined change rate value to determine the magnitude, and an air volume table that outputs an air volume with respect to the determination results from the difference value determination unit and the change rate determination unit. Alternatively, the air volume setting unit is configured by an air volume table that outputs an air volume with respect to a difference between the temporal change rate of the pipe temperature and the predetermined overload temperature.

Further, the abnormality detecting section is composed of a message table for outputting an abnormal message with respect to the number of times.

[0011]

With the above construction, in the air conditioner controller of the present invention, during the heating operation, the outdoor heat exchange is performed according to the difference between the temporal change rate of the pipe temperature and the predetermined overload temperature. To prevent the heating high pressure overheat protection operation by controlling the air volume of the blower of the heater, and further, when the number of heating high pressure overheat protection operations within a predetermined time exceeds a predetermined abnormal number, The abnormality of the refrigeration cycle is displayed on the display unit.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A control device for an air conditioner according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a refrigeration cycle diagram showing a refrigeration cycle of an air conditioner control device according to the present invention, and FIG. 2 is a block diagram showing an embodiment of an air conditioner control device according to the present invention. As shown in FIG. 1, the air conditioner according to the present invention has a heat pump type refrigeration cycle in which a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a pressure reducer 4, an indoor heat exchanger 5 and the like are sequentially connected. The indoor heat exchanger 5 is switched to operate as a condenser or an evaporator to perform heating operation or cooling operation.

As shown in FIG. 2, the control device for an air conditioner according to the present invention has an operation unit 11 for inputting a room temperature (Ts) and the like, and a display unit 12 for displaying the temperature and the like.
An indoor temperature detector 13 for detecting an indoor temperature (Tr), a pipe temperature detector 14 for detecting a pipe temperature (Tp) of the indoor heat exchanger, and an overload temperature for storing a predetermined overload temperature (To). A storage unit 15, a control unit 16 that controls each unit,
The communication unit 17 that communicates with the outdoor control unit 30, the outdoor control unit 30, and the pipe temperature from the pipe temperature detector 14 (T
p) and the first computing unit 18 that outputs the difference (To-Tp) between the overload temperature set value (To) from the overload temperature storage unit 15, and the pipe temperature (T from the pipe temperature detector 14).
2) a second calculation unit 19 for calculating a temporal change rate (ΔTp) of p), and a temporal change rate (ΔT) of the pipe temperature (Tp).
p) and the predetermined overload temperature (To-Tp) in accordance with the difference (To-Tp), the air volume setting unit 20 for setting the air volume (W) of the blower fan 6 of the outdoor heat exchanger 3 is provided, and during normal operation The controller 16 controls the indoor temperature (Tr) from the indoor temperature detector 13 and the indoor set temperature (T) input from the operation unit 11.
s) to control the outdoor control unit 30 via the communication unit 17 to control the operation of the compressor 1 intermittently, and during heating operation, the pipe temperature (Tp). ) And the predetermined overload temperature set value (To) (To-Tp), the communication unit 17
The outdoor control unit 30 is controlled via the control unit to control the air volume (W) of the blower fan 6 of the outdoor heat exchanger 3.

However, when the refrigerant in the compressor 1 is insufficient, the high pressure becomes excessive during the heating operation, and the pipe temperature (Tp) exceeds a predetermined overload temperature (To). The control unit 16 controls the communication unit 17
The outdoor control unit 30 is controlled via this to stop the operation of the blower fan 6 of the outdoor heat exchanger 3 and the compressor 1 to perform the heating high pressure overheat protection operation.

Further, a timer 21 for measuring a predetermined time
A counter 22 that counts the number of times (n) the heating high-voltage overheat protection operation is performed within the same predetermined time; a number storage unit 23 that stores a predetermined number (N); and the counter 22.
When the number of counts (n) exceeds a predetermined number (N) from the number storage unit 23, an abnormality detection unit 24 that outputs an abnormality monitor output according to the number of counts (n) is provided. When the number (n) of heating / high pressure overheating protection operations within a predetermined time exceeds the predetermined number (N) (n> N), the abnormality of the refrigeration cycle is displayed on the display unit 12.

Further, the second calculation unit 19 includes a pipe temperature storage unit 19a for temporarily storing the pipe temperature (Tp) from the pipe temperature detector 14, and a pipe temperature (Tp) stored in the pipe temperature storage unit 19a. Tpm) and the pipe temperature (Tp) from the pipe temperature detector 14 are compared to output the temporal change rate (ΔTp) of the pipe temperature (Tp).

Further, as shown in FIG. 2, the air flow rate setting unit 20 controls the value (Tc) of the difference between the pipe temperature (Tp) and the predetermined overload temperature (To) and the predetermined difference value (Tcs). And a difference value determination unit 20a that determines the magnitude, a temporal change rate (ΔTp) of the pipe temperature (Tp), and a predetermined change rate (Δ).
Tps) and the change rate determination unit 20 for determining the magnitude
b, and an air volume table 20c as shown in FIG. 3 that outputs the air volume in response to the determination results from the difference value determination unit 20a and the change rate determination unit 20b. Further, although not shown, the air flow rate setting unit 20 does not show a time change rate (ΔTp) of the pipe temperature (Tp) and a difference (To-Tp) between the pipe temperature (Tp) and a predetermined overload temperature (To). It may be configured by an air volume table as shown in FIG. 3 which outputs the air volume (W) for

Further, as shown in FIG. 4, the abnormality detecting section 24 is composed of a message table 24a for outputting an abnormal message with respect to the number of times.

The operation of the above arrangement will be described below. First, at the time of normal operation, the user inputs the indoor set temperature (Ts) from the operation unit 11, so that the difference (Tr−) from the indoor temperature (Tr) from the indoor temperature detector 13 is entered.
By controlling the air volume of the indoor blower fan 7 according to Ts) and controlling the outdoor control unit 30 via the communication unit 17 to control the intermittent operation of the compressor 1. The indoor temperature (Tr) is set to the indoor set temperature (Ts).

FIG. 5 and FIG. 6 show an embodiment of an operation flow for explaining an auxiliary operation for preventing the heating high pressure overheat protection operation from frequently occurring during the heating operation. , Will be sequentially described. Apart from the above room temperature control, as shown in the operation flow of FIG. 5, when the heating operation is started, first, the air volume (W) of the blower fan 6 of the outdoor heat exchanger 3
Is set to the maximum air flow rate (W = Wmax) (ST1), then the pipe temperature (Tp) is detected (ST2), and the difference value determining unit 20a causes the pipe temperature (T
p) and a predetermined overload temperature (To) (To-Tp =
Tc) and the first predetermined difference value (Tcs1) are compared to determine the magnitude (ST3), and if the determination result is (Tc <Tcs1), the change rate determination unit 20b causes the second operation unit 19 to operate. The rate of change (ΔTp) of the pipe temperature (Tp) over time is compared with a predetermined change rate (ΔTps) to determine the magnitude (ST4).
Then, if the determination result is (ΔTp> ΔTps), the air volume (W) of the blower fan 6 is set as one paragraph (ST5), and then it is determined (ST6) whether the heating high pressure is excessively high (Tc <0?). There is.

If it is not in the heating high-pressure overheat state (Tc <0), the difference value determining unit 20a determines the difference between the pipe temperature (Tp) from the first computing unit 18 and the predetermined overload temperature (To). (To-Tp = Tc) is compared with the second predetermined difference value (Tcs2) to determine the size (ST7), and the determination result is (Tc>
If it is Tcs2), the air volume (W) of the blower fan 6 is increased by one step (ST8).

Further, as shown in the operation flow of FIG. 6, the difference (To-Tp = Tc) between the pipe temperature (Tp) and the predetermined overload temperature (To) is calculated by the first calculation unit 18 to the second value. The calculation unit 19 calculates the temporal change rate (ΔTp) of the pipe temperature (Tp) (ST9), and refers to the air volume table 20a as shown in FIG. 4 to set the air volume (W) of the blower fan 6 ( S
T10) may be performed. When the air volume (W) of the blower fan 6 is set as described above, the air blower 6 is controlled from the outdoor control section 30 via the communication section 17 to control the air flow rate (W) to the outdoor heat exchanger 3. ) Is made variable so that the heating high pressure overheat protection operation does not occur frequently.

However, in spite of the above control, when the variable capacity compressor 1 is in a shortage of refrigerant, the high pressure becomes excessive during the heating operation, and the pipe temperature (Tp) becomes a predetermined value. May exceed the overload temperature (To). As described above, it is determined whether the pipe temperature (Tp) exceeds the predetermined overload temperature (To) and the heating high pressure overheat state in FIG. 5 or 6 (To-Tp = Tc <0?) (ST6). If the result is Y, that is, if the heating high pressure overheat state (Tc <0), the operation of the blower fan 6 of the outdoor heat exchanger 3 and the variable capacity compressor 1 is stopped to perform the heating high pressure overheat protection operation. It is performed (ST30).

Then, the number (n) of heating high voltage overheat protection operations within the predetermined time is counted (ST21), and when the count number (n) exceeds the predetermined number (N) (n> N) (n> N). ST22), the message table 2 as shown in FIG.
4a, display a message such as "clean the air filter" or "please inject refrigerant gas" indicating the abnormal state of the refrigeration cycle according to the number of times on the display unit 12 (ST23). I did it. In the present embodiment, the above-mentioned message is displayed to indicate the abnormal state, but it is also possible to light an indicator such as an LED.

For the measurement of the predetermined time, as shown in FIG. 5, after the heating operation is started, the timer and counter are set (ST11), the time is up (ST12), and the timer and counter are reset (ST13). I am trying.

[0026]

As described above, according to the control device for an air conditioner according to the present invention, the outdoor heat is changed according to the difference between the temporal change rate of the pipe temperature and the predetermined overload temperature during the heating operation. Preventing the heating high pressure overheat protection operation by controlling the air volume to the exchanger, and further, if the number of heating high pressure overheat protection operations within a predetermined time exceeds a predetermined abnormal number,
Since the fact that there is an abnormality in the refrigeration cycle is displayed on the display as an abnormality, the frequent heating high pressure overheat protection operation is prevented during heating operation, and the frequent heating high pressure overheat protection operation is also performed. It is possible to provide a control device for an air conditioner that notifies a user of the occurrence of an abnormality when it occurs.

[Brief description of drawings]

FIG. 1 is a refrigeration cycle diagram showing a refrigeration cycle of a control device for an air conditioner according to the present invention.

FIG. 2 is a block diagram showing an embodiment of a control device for an air conditioner according to the present invention.

FIG. 3 is an embodiment of an air volume table of a control device for an air conditioner according to the present invention.

FIG. 4 is an example of a message table of the control device for an air conditioner according to the present invention.

FIG. 5 is an example of an operation flow of a control device for an air conditioner according to the present invention.

FIG. 6 is another embodiment of the operation flow of the control device for an air conditioner according to the present invention.

FIG. 7 is a block diagram of a conventional air conditioner control device.

[Explanation of symbols]

1 compressor 2 four-way valve 3 outdoor heat exchanger 4 pressure reducer 5 Indoor heat exchanger 6 Blower fan 7 Blower fan 11 Operation part 12 Display 13 Indoor temperature detector 14 Indoor heat exchanger piping temperature detector 15 Overload temperature storage section 16 Control unit 17 Communication means 18 First computing unit 19 Second operation unit 19a storage unit 19b Comparison section 20 Air volume setting section 20a Difference value determination unit 20b Change rate determination unit 20d air volume table 21 timer 22 counter 23 Count memory 24 Abnormality detector 24a message table 30 Outdoor control unit

Claims (7)

(57) [Claims] 1. A heat pump type refrigeration cycle in which a compressor, a four-way valve, an outdoor heat exchanger, a decompressor, an indoor heat exchanger and the like are sequentially connected, and the refrigeration cycle is used to input an indoor set temperature and the like. Section, a display section for displaying an operation mode, an indoor temperature detector for detecting an indoor temperature, a pipe temperature detector for detecting a pipe temperature of the indoor heat exchanger, and a storage unit for storing a predetermined overload temperature. A load temperature storage unit, a control unit that controls each unit, a communication unit that communicates with the outdoor control unit, and a control device that is configured by the outdoor control unit, and normally controls the compressor and the outdoor heat according to the load. When the operation of the blower fan of the exchanger is intermittently controlled, and when the pipe temperature exceeds a predetermined overload temperature during heating operation, the control unit controls the outdoor control unit via the communication unit to perform the outdoor heat exchange. Blast fan and front In an air conditioner that stops the operation of a compressor and performs a heating high-pressure overheat protection operation, a first condition that outputs a difference between a pipe temperature from the pipe temperature detector and an overload temperature from an overload temperature storage unit. According to the difference between the temporal change rate of the pipe temperature and the predetermined overload temperature, and the second arithmetic section that calculates the temporal change rate of the pipe temperature from the pipe temperature detector. An air flow rate setting unit that sets the air flow rate of the blower fan of the outdoor heat exchanger is provided, and during the heating operation, the outdoor heat exchanger according to the difference between the temporal change rate of the pipe temperature and the predetermined overload temperature. The air conditioner control device is characterized in that the air volume of the blower fan is changed. 2. A heat pump type refrigeration cycle in which a compressor, a four-way valve, an outdoor heat exchanger, a pressure reducer, an indoor heat exchanger, etc. are sequentially connected, and the refrigeration cycle is used for inputting an indoor set temperature and the like. Section, a display section for displaying a set temperature, an indoor temperature detector for detecting an indoor temperature, a pipe temperature detector for detecting a pipe temperature of the indoor heat exchanger, and a storage unit for storing a predetermined overload temperature. A load temperature storage unit, a control unit that controls each unit, a communication unit that communicates with the outdoor control unit, and a control device that is configured with the outdoor control unit. Normally, the compressor and the outdoor unit are controlled according to the load. The blower fan of the heat exchanger is controlled to be intermittently operated, and when the pipe temperature exceeds a predetermined overload temperature during heating operation, the control unit controls the outdoor control unit via the communication unit to control the outdoor control unit. Blower fan for outdoor heat exchanger and In an air conditioner that stops the operation of the compressor and performs a heating high pressure overheat protection operation, a timer that measures a predetermined time, and a counter that counts the number of times of the heating high pressure overheat protection operation within the predetermined time ,
When a heating operation is performed, a number-of-times storage unit that stores a predetermined number of times and an abnormality detection unit that outputs an abnormality monitor output according to the count number when the number of counts from the counter exceeds the predetermined number of times from the number-of-times storage unit are provided. A control device for an air conditioner, wherein when the number of heating / high pressure overheating protection operations within the predetermined time exceeds a predetermined number, an abnormality of the refrigeration cycle is displayed on the display unit. 3. A heat pump type refrigeration cycle in which a compressor, a four-way valve, an outdoor heat exchanger, a pressure reducer, an indoor heat exchanger and the like are sequentially connected, and the refrigeration cycle is used to input an indoor set temperature and the like. Section, a display section for displaying a set temperature, an indoor temperature detector for detecting an indoor temperature, a pipe temperature detector for detecting a pipe temperature of the indoor heat exchanger, and a storage unit for storing a predetermined overload temperature. A load temperature storage unit, a control unit that controls each unit, a communication unit that communicates with the outdoor control unit, and a control device that is configured with the outdoor control unit. Normally, the compressor and the outdoor unit are controlled according to the load. The blower fan of the heat exchanger is controlled to be intermittently operated, and when the pipe temperature exceeds a predetermined overload temperature during heating operation, the control unit controls the outdoor control unit via the communication unit to control the outdoor control unit. Blower fan for outdoor heat exchanger and In an air conditioner that stops the operation of the compressor and performs a heating high pressure overheat protection operation, outputting a difference between a pipe temperature from the pipe temperature detector and an overload temperature from an overload temperature storage unit. 1 calculation unit, a second calculation unit for calculating the temporal change rate of the pipe temperature from the pipe temperature detector, and a difference between the temporal change rate of the pipe temperature and the predetermined overload temperature. An air flow rate setting unit for setting the air flow rate of the blower fan of the outdoor heat exchanger, a timer for setting and measuring a predetermined time period, and a counter for counting the number of times of the heating high pressure overheating protection operation within the predetermined time period,
A number storage unit that stores a predetermined number of times and an abnormality detection unit that outputs an abnormality monitor output when the number of counts from the counter exceeds the predetermined number of times stored by the number storage unit are provided. The air volume of the blower fan of the outdoor heat exchanger is varied according to the difference between the temporal change rate and the predetermined overload temperature, and the number of heating high-pressure overheat protection operations within a predetermined time is a predetermined number. A control device for an air conditioner, wherein when the temperature exceeds the limit, an abnormality of the refrigeration cycle is displayed on the display unit. 4. A pipe temperature storage unit for temporarily storing the pipe temperature from the pipe temperature detector, a pipe temperature stored in the pipe temperature storage unit, and a pipe temperature detector for storing the pipe temperature from the pipe temperature detector. The control device for an air conditioner according to claim 1 or 3, wherein the control device is configured by a comparison unit that compares the pipe temperature. 5. A difference value determination unit that compares the value of the difference between the pipe temperature and the predetermined overload temperature with a predetermined difference value in the air flow rate setting unit, and determines the magnitude of the difference value; It is composed of a change rate determination unit that compares the value of the change rate with a predetermined change rate value to determine the magnitude, and an air volume table that outputs an air volume with respect to the determination results from the difference value determination unit and the change rate determination unit. The control device for an air conditioner according to claim 1 or 3, wherein 6. The air volume setting unit is configured by an air volume table that outputs an air volume corresponding to a difference between a temporal change rate of the pipe temperature and the predetermined overload temperature. The control device for an air conditioner according to claim 3. 7. The control device for an air conditioner according to claim 2 or 3, wherein the abnormality detection unit is configured by a message table that outputs an abnormal message with respect to the number of times.