KR920006073B1 - Air conditioner - Google Patents

Abstract

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Description

Air conditioner

1 is a principle diagram showing the basic configuration of an air conditioner according to the present invention.

2 is a system configuration diagram showing the entire air conditioner.

3 is a block diagram showing the configuration of a control unit of the air conditioner.

4 is a flowchart for explaining the operation of the controller in FIG.

5 is an explanatory diagram showing a relationship between a set temperature and a room temperature for explaining the air conditioner.

6 is a flowchart for explaining the operation of the control apparatus according to another embodiment of the present invention.

7 is an explanatory diagram showing the relationship between the set room temperature and the room temperature for explaining another embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

1: heat source 2: blower

3: duct 4a-4d: damper

5a to 5d: Room thermostat 6: Heat load measuring means

7: damper opening degree determining means 8: damper opening degree correction means

9: damper control means

The present invention relates to a duct type air conditioner, particularly an on / off / damper control method, employing a variable air volume control method capable of independently controlling the room temperature of each room.

The variable air volume control (hereinafter referred to as VAV) of the duct type air conditioner includes the aperture type and the bypass type, and the aperture type includes the two-position control (on / off control) type and the proportional control type by the damper control method.

Japanese Patent Application Laid-Open No. 58-81438 is exemplified in the prior art relating to the two-position control type of the aperture type. This is to control the damper on and off in order to reduce the temperature difference between the upper and lower parts of the room during heating and to increase the comfort. For example, when the current room temperature is lower than the set room temperature during heating, the damper is above the maximum opening. Is the minimum opening, and when it is near the set room temperature, the on / off control is performed at the maximum opening and the minimum opening at a certain period. The difference between the detection signal of the room temperature detector and the signal of the room temperature setter is input to the differential amplifier, and is input to the on / off time difference generator together with the signal from the pulse generator to output the on / off control signal to the damper.

At this time, the total weight of the duct changes according to the total opening degree of the plurality of dampers, and the pressure in the duct increases and decreases, but the blower capacity of the air conditioner is controlled by the detection signal of the pressure sensor and the pressure is kept constant. Moreover, as a 2nd prior art, Unexamined-Japanese-Patent No. 51-119146 is mentioned.

This is to obtain an electric or electronic damper in the duct, to control the damper in the whole or the middle by the signal from the room thermostat and to control the room temperature. And dampers in rooms that do not require air conditioning can be fully closed by manual switches. In addition, there is a Japanese Laid-Open Patent Publication No. 51-87949.

As a conventional technique, Japanese Unexamined Patent Application Publication No. 57-169525 is mentioned. This is mainly for the purpose of improving the cooling feeling when cooling. The airflow is distributed by the operation of dampers with multiple blowouts while the total airflow of the duct is kept constant. . However, in the third prior art, the operation of the damper is not made for the purpose of room temperature control. Moreover, Japanese Unexamined-Japanese-Patent No. 48-26056 is mentioned as a 4th prior art.

This is to forcibly open a specific damper when all of the on / off dampers are to be closed at the same time so that they are not all closed at the same time.

In the air conditioner of the first prior art, the room temperature distribution during heating is improved and the room temperature can be controlled at the set value, but when the number of dampers is small and the damper opening degree is controlled to expand and close, all dampers are simultaneously used. Opportunities for total closure occur frequently, and the generator and blower must be stopped and restarted every time. As a result, there are problems such as displacement from the set point of room temperature and increase in the number of on / off cycles of the heat source. In particular, in the case of a residential system, the above problems are likely to occur due to the low water resistance, the forced ventilation cannot be performed, and the heat load is small.

In the second conventional air conditioner, since the damper is controlled by the expansion or the middle, the heat source and the blower are not frequently stopped. However, when the heat load is small, the room temperature cannot be controlled very accurately at the set value. There was a problem that room temperature exceeded the set value.

In addition, in the fourth conventional air conditioner, when one of the dampers is to be closed, a certain damper is forcibly opened, so the room temperature of the room cannot be controlled as desired at the set value, and it is also against energy saving. There was this. The present invention has been made to solve the above problems, and an object of the present invention is to obtain an air conditioner having a good temperature distribution in a room, good controllability of a room temperature, and a small damper being developed at the same time, and a small on / off heat source.

The air conditioner according to the present invention measures the heat load size and the order of the size of each room by means of heat load measuring means by a signal from a room thermostat installed in each room, and controls the normal room temperature by the measurement result. The damper opening degree determination means determines the opening or closing of the damper, and when the total opening degree of the damper is less than a certain value, the damper opening degree is corrected by the damper opening degree correction means when the damper opening degree is lower than a certain value. Since the dampers in each room were controlled by the open or closed damper control means, the total damper opening correction means determined by the damper opening determining means became zero (0) or less than the opening degree which would interfere with the continuous operation of the heat source. In this case, dampers in one room or several rooms with high heat load are forced to open under certain conditions. Decrease the chance of being closed at the time, and to provide an air conditioner that can reduce the number of times of the heat source on-off group.

Next, an embodiment of an air conditioner of the present invention will be described with reference to the drawings.

1 is a principle diagram showing the basic configuration of this invention. As apparent from FIG. 1, the heat source 1 and the blower 2 which generate cold or warm air, the duct 3 which distributes this cold or warm air to each room, and the duct 3 communicate with each room. Dampers (4a) to (4d) arranged in the branch to be provided, and the room thermostat (5a) to (5d) provided in each room, the signal of each of the room thermostat (5a) to (5d) as input The heat load measuring means 6 measures the order of the heat load size and the size of each chamber, and the damper opening degree determining means 7 opens or closes the opening degree of each damper 4a to 4d based on the heat load. If the total opening degree of the dampers 4a to 4d is less than a certain value (minimum total opening degree) according to the result of the determination, the damper opening degree of the room with a large heat load under a certain condition is determined by the damper opening correction means 8. The damper control means 9 opens or closes each damper 4a to 4d based on the result. It is configured to control.

2 is a system configuration of the entire air conditioner applying the principle method of FIG. In the figure, reference numeral 10 denotes an indoor unit constituting a heat pump as the heat source 1 installed on the ceiling of a house, and includes a blower 2 filter 11 and a heat exchanger 12 therein. 13 is an outdoor unit installed outdoors. 14 is a branch duct branched from each duct 35a to 35d in the duct 3 connected to the indoor unit 10, and 15a to 15d are VAVs arranged in the middle of the branch ducts 14a to 14d. The unit incorporates dampers 4a to 4d which are controlled to be opened and closed by a motor or the like. Blowing ports 16a to 16d are connected to the ends of the branch ducts 14a to 14d, and suction ports 17a to 17d are provided in the respective rooms.

In addition, the ceiling suction opening 18 is provided on the suction side of the indoor unit 10, and the control device 19 is provided on the indoor unit 10. In addition, a temperature detector 20 and a pressure detector 21 are provided in the duct 3. Although not shown, room temperature detectors and room temperature setters are provided in the room thermostats 5a to 5d. In addition, one of the room thermostats 5a to 5d also serves as a main controller for switching on and off the power supply and heating and cooling.

3 is a detailed circuit configuration diagram of the control device 19. As shown in FIG. In the figure, 22 is a microcomputer constituting the control device 19, which is composed of a DPV 23, a memory 24, a timer 25, an input circuit 26 and an output circuit 27. 28 is an analog multiplexer to which the detection signals of the respective room thermostats 5a to 5d, the temperature detector 20 and the pressure detector 21 are input. The output of the analog multiplexer 28 is converted into a digital signal by the A / D converter 29 and input to the CPU 23 through the input circuit 26. The heat source controller 31 is connected to the output circuit 27 via a port coupler 30a. The heat source controller 31 is constituted by an inverter and is supplied to the output heat source 1.

Similarly, the blower controller 32 is connected to the output circuit 27 via the photocoupler 30b. The blower controller 32 is configured by an inverter or the like and controls the blower 2. In addition, each damper controller 33 is connected to the output circuit 27 via a photocoupler 30c. Each damper controller 33 is constituted by a relay or the like as damper control means, and performs damping control of the dampers 4a to 4d. 34 is a power source for supplying AC or DC power to the heat source controller 31, the blower controller 32, and the damper controller 33. Next, the operation of the above embodiment will be described with reference to FIGS. 4 and 5 during the heating operation.

FIG. 4 is a flowchart showing a control program of the damper control portion stored in the memory 24 of the microcomputer 22, and FIG. 5 is an operation explanatory diagram showing the controlled change of room temperature with respect to the set room temperature. First, in the heat load measuring means 6, a process displayed in steps 40 to 43 is executed. In other words, the values of the room temperature T (I) and the set room temperature R (I) of the room in the room thermostats 5a to 5d of each room are the analog multiplexer 28 and the A / D converter 29 and the input circuit 26. Is inputted to the CPU 23 via (Stem 40). And I represents the room number.

In the next step 41, the timing of the damper control is checked and if the timing of the control proceeds to the next step 42. If the timing of the control is not, the routine of the damper control is exited. ) T (I) (T (I) -R (I) during cooling operation) obtains the heat load D (I). In the next step 43, the smallest room (D (I) is the smallest room) is found in the room with the largest heat load (D (I) is the largest room) according to the size of D (I).

In the next step 44, it is determined whether or not the heat source 1 is in the defrost state, and if not, the process proceeds to the next step 45. In step 45 as the damper opening degree determining means 7, it is determined whether the dampers in each room are opened or closed based on the size of D (I). As shown in FIG. 5, for example, if the present room temperature T (I) is higher than the set room temperature R (I) by more than A ° C, the dampers 4a- (4d) are closed, and T (I) is B ° C than R (I). If abnormally low, dampers 4a to 4d are opened, and T (I) is R (I). The surface within the range is controlled so as not to change the opening degree.

Next, in the damper opening degree correction means 8, the process of step 46-step 52 is performed. In step 46, the total opening degree of the damper determined by step 45 is calculated | required (when 3 dampers are 300%, the integrated value of each damper opening degree is calculated | required).

In the next step 47, the total opening degree of the dampers 4a to 4d is determined, and if it is 200% or more, the process proceeds to the staff 53 described later. In this embodiment, the minimum total opening is 200%. When the total opening degree is 100%, that is, when there are only one damper, the process proceeds to the next step 48. In step 48, the dampers of the largest room of the heat load and the second large room obtained in step 43 are opened, and the total opening degree is set to 200%. The control in this step 48 is repeated as many times as long as there is a room where the room temperature has not reached the set room temperature.

After the process of step 48 is complete | finished, it progresses to step 53. When the total opening degree is determined to be 0% in the step 47, the process proceeds to step 49. In step 49, it is determined whether or not the total degree 0% state is continuous three or more times, for example, and if it is three or more times, the process proceeds to step 54 described later. In addition, if it is three times or less, it progresses to the next step 50. In step 50, when the opening degree of dampers 4a-4d is calculated again, and room temperature T (I) is lower than setting room temperature R (I) + A, a damper is opened.

The adapter originally determined as lung in step 45 is here T (I) If the relationship is (R (I) + A), is changed to. This determination is applied only to the room with the largest heat load, and when T (I) <(R (I) + A), the damper of the largest room and the second-largest room of heat load is corrected by the dog to 200%. do.

In the next step 51, the total opening degree of the dampers 4a- 4d is again calculated.

If the total opening degree is determined in the next step 52 and is not 0% (ie 200%), the process proceeds to the next step 53. In step 53 as the damper control means 9, a signal is output to the damper controller 33 via the output circuit 27 and the porter coupler 30c, and the respective dampers 4a to 4d are opened or closed. To control. If it is determined in step 44 that the defrost is in progress, the process proceeds to step 55, the damper of the smallest room and the second smallest room of the heat load is opened, and the dampers of the other room are closed, and the process proceeds to step 53. According to this control, the phenomenon of decreasing room temperature by cold wind at the time of defrost by reverse cycle operation of a heat pump is alleviated.

When it is determined at step 49 that the total opening degree of the dampers 4a to 4d is 0% or more, and when the total opening degree is determined to be 0% in step 52, the step ( Proceed to 54). Step 54 stops the heat source 1 and the blower 2 with a special subroutine. Since the detection signal of the temperature detector 20 and the pressure detector 19 is digitalized by the A / D converter 29 via the analog multiplexer 28, the CPU (through the input circuit 26) will be omitted. 23). The output of the CPU 23 sends control signals to the heat source controller 31 and the blower controller 32 through the output circuit 27 and the photo coupler 30a, 30b, respectively. As a result, the capabilities of the heat source 1 and the blower 2 are varied and the blowing temperature and pressure are controlled to be approximately constant. The above control is repeated at regular intervals by the timer 25.

As described above, according to this control, the warm air is intermittently blown into the room from the jets 16a-16d. When the dampers 4a to 4d are turned on, the airflow reaches the bottom surface because of the large amount of air flow (wind speed). The difference between the upper and lower temperatures in the room is small and the temperature distribution is good. In addition, the chance of all the dampers 4a-4d being closed at the same time is reduced, the number of on / off times of the heat source 1 and the blower 2 is reduced, and stable operation is achieved. In addition, since the damper has a minimum opening of 200%, the operation of the low wind amount and small capacity of the heat source 1 and the blower 2 with low efficiency is eliminated.

In the above embodiment, the number of dampers is four and the minimum total opening is 200%. For example, when the number of dampers is six, the minimum total opening is 300%, three is 100%, or four is 100%. As described above, the minimum total opening degree may be determined according to the number of dampers, the variable range of the heat source 1 and the blower 2.

Moreover, in the said Example, it was determined in step 49 whether the damper total opening degree is 0 or more times three times, but this frequency is not limited to three times. This step 49 can also be omitted. A and B values in FIG. 5 can be set freely.

In the above embodiment, when the total opening degree in step 47 is 100%, the dampers of the two chambers with large heat loads are corrected by dogs in step 48, and the total opening degree is 200%. In this case, the heat load in which the room temperature has already reached the room temperature may have slightly exceeded the room temperature of the second large room.

In the above embodiment, the relationship between the number of dampers and the minimum total opening degree is not automatically selected. This improvement is shown next.

FIG. 6 is a flowchart showing another embodiment of the control program of the damper control portion stored in the memory 24 of the microcomputer 22, and FIG. 7 is an operation explanatory diagram showing the relationship between the set room temperature and room temperature.

Since the portions of the steps 40 and 46 shown in the flowchart of FIG. 4 are the same, they are omitted in FIG. 6, and the steps 53 and 54 display the same contents as in FIG. The same reference numerals are used. Step 56 Step 71 determines the total number (damper number) of the dampers 4 in which the processing routine of the damper opening degree correction means 8 is first removed in step 56. This damper number is input to the memory 24 at the time of system installation.

When the number of dampers is three or less, the process proceeds to step 57 and control is performed so that the minimum total opening degree is 100%. When the total opening degree is 100% or more in step 57, the process proceeds to step 70 to be described later without performing special control. When the total degree is 0%, the process proceeds to the next step 58. The room temperature T (I) and the set room temperature R (I) of the room with the maximum heat load are compared and T (I). If the relationship is not (R (I) + A), the process proceeds to the next step 59. In step 59, it is determined whether or not the state of the damper total degree is 0 or more times three times in succession, and if it is three or more times, the process proceeds to step 70 without correcting the damper opening degree. T (I) at step 58 In the case of (R (I) + A) relationship and when the state of 0% is less than three times in step 59, the process proceeds to step 60 and the damper of the room of the maximum heat load is corrected from the lung to the dog. Originally, the damper opening is changed from lung to dog, and when the room temperature enters zone G, the damper in this room is opened when the room temperature of the room with maximum heat load is zone F temporarily so as not to frequently stop the ground heat source (1).

By this control, the average room temperature of the room with the maximum heat load becomes a value slightly above the set room temperature R (I), but it does not significantly exceed. In the case where the room temperature of the room with the maximum heat load is the zone E, it is corrected up to three times (step 59). This control is not so preferable because the room temperature is controlled high, and the number of times is limited to three times. During this period, the room temperature of the other room drops, and the room temperature of the room drops to the F zone or G zone, so that the room of the maximum heat load alternates, and thus no particular half and half room temperature is controlled to be high.

When the damper number is 4 or more in step 56, the process proceeds to step 61, where the minimum total opening degree is controlled to 200%. When the total opening degree is 200% or more in step 61, the process proceeds to step 70 without any special control. When the total degree is 0%, the process proceeds to step 62. The room temperature T (I) and the room temperature R (I) of the room with the maximum heat load are compared and the room temperature T (I) If the relationship is not (R (I) + A), the process proceeds to step 70 without performing special control.

When the total opening degree is 100% in step 61, the process proceeds to step 63, where the room of maximum heat load is T (I). If it is the relationship of (R (I) -B), the process proceeds to the next step 64. In step 64, the room with the second largest thermal load is T (I). In the case of (R (I) + A), the process proceeds to the next step 65, where the damper of the room with the highest heat load and the room with the second largest heat load is opened, and the process proceeds to step 70.

In step 62, the room of the maximum heat load is T (I). When it is determined that R (I) + A) and in step 63, the room of the maximum heat load is T (I) When it is determined not to be (R (I) -B), the process proceeds to step 66 as well. In step 66, the room with the second largest thermal load is T (I). When it is determined that the relationship is (R (I) + A), the process proceeds to the next step 65, and when it is determined NO, the process proceeds to the next step 67. In step 67, the currently open damper is corrected by closing (all dampers are closed), and the flow proceeds to step 70. In step 64, the room with the second largest thermal load is T (I). When it is determined that the relationship is not (R (I) + A), the flow proceeds to step 68. In the depth 68, the room with the maximum heat load is T (I). In the case of (R (I) -C), the process proceeds to the above step 65, otherwise the process proceeds to the next step 69. In step 69, the number of times passing through step 69 is counted, and when it is three or more times, the process proceeds to the step 67, and when less, the process proceeds to the step 65. In the control with a minimum total opening of 200%, the room where the room temperature has been set before and after the set room temperature is not unnecessarily heated, and when there is a room where only one room has not reached the set room temperature, the room temperature of this room is close to the set room temperature. Control is required.

For example, in a system with four dampers, if three rooms reach the set room temperature and less than one room, the minimum total opening is limited to 200%, so only one room cannot be opened and the four rooms are closed. It is necessary to judge whether two rooms are open. In said step 63-69, it judges as follows.

According to the control of the second embodiment, the minimum total opening degree can be automatically set to 100% or 200% according to the total number of dampers 14a-4d installed, and the damper opening degree determining means when the minimum total opening is 200%. (7) When the total opening degree is determined to be 100%, the damper opening degree is corrected in response to the elevation of the room temperature of the room with the largest heat load and the room with the second largest heat load, so that each room temperature can be controlled close to the room temperature, and the damper 4a -(4d) can all reduce the chance of obsolescence.

As described above, when the total opening degree of each damper determined by the damper opening degree setting means is small based on the output of the heat load measuring means, the damper opening degree correction means corrects the direction of increasing the total opening degree within the passion condition. It is designed to reduce the chance of all dampers being closed at the same time, to operate the heat source and the transmitter stably, and to control the room temperature to the set value.

Claims (9)

In the air conditioner equipped with a damper installed in each branch of the duct for guiding the hot or cold air by the heat source and the blower, and the room thermostat disposed in each room, the signal from the room thermostat is detected and the heat load of each room is detected. The heat load side means for measuring and calculating the magnitude order of the heat load, the damper opening degree determining means for normal room temperature control based on the measurement result of the heat load measuring means, and the total opening degree of the damper based on the determination result of this damper opening degree determining means. Damper opening correction means for correcting the damper opening of a room with a large heat load when the value is lower than the damper, and damper control for controlling the damper of each room by opening or closing based on the output of the damper opening correction means. An air conditioner comprising a means. The heat load measuring means detects a signal of room temperature T (I) and set room temperature R (I) from each room thermostat (I), and measures the heat load of each room by the difference D (I). The air conditioner is designed to calculate the order of heat load. The damper opening degree determining means has a room temperature of R (I). An air conditioner that is determined to be open or closed to fall within the range of. 2. The damper opening degree correction means according to claim 1, wherein the damper opening degree correction means sets the minimum total opening degree of the damper according to the number of installed dampers, and when the total opening degree determined by the damper opening degree determining means is lower than the minimum opening degree, the heat load measured by the heat load measuring means is large. An air conditioner that is calibrated as dogs in a passionate condition, as long as it meets the minimum total opening of the room. 5. The damper opening degree correction means is characterized in that the heat load of each room measured by the heat load measuring means is the most when the total opening degree of the damper is determined to be at least 200% and the damper opening degree determination means is 100% (10,000 pieces). An air conditioner that compensates for dampers in large rooms and second large rooms. 5. The damper opening degree correction means has the largest heat load measured by the heat load measurement means when the total opening degree of the damper determined by the damper opening degree determining means is 0% (all closed). When the room temperature of the room is lower than R (I) + A (single) or higher than R (I) -B (cooling). 5. The damper opening degree correction means according to claim 4, wherein the damper opening degree correction means has a minimum total opening of 200% and a total opening degree of the damper determined by the damper opening determination means of 0%. Air conditioner that compensates damper of this room and room with second heat load when it is lower than R (I) + A (heating) or higher than R (I) -B (cooling). . 8. The damper opening degree correction means according to claim 7, wherein the damper opening degree correction means has a minimum total opening degree of 200% and a total opening degree of the damper determined by the damper opening degree determining means is 100% or 0%. An air conditioner that compares D (I) of a room and selects whether the two room dampers are to be corrected openly or all dampers to be closed. The air conditioner according to claim 7, wherein the opening degree correction to the damper opening degree correction means is limited to a certain number of times and no correction is made when the number of times of the opening degree is exceeded.