JP2637168B2 - Control method of refrigerant heating type air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a control method of a refrigerant heating type air conditioner.

(Prior Art) FIG. 2 is a view showing a refrigeration cycle, in which an outdoor heat exchanger 3, a pressure reducing device 4, a check valve 5, an expansion valve 6 and a compressor 1 are connected to a compressor 1 via a four-way switching valve 2. The indoor heat exchangers 7 are sequentially connected in a ring shape. In addition, the check valve 5 is provided so that the flow direction of the refrigerant during cooling is a forward direction. Further, a check valve 8 is provided between the four-way switching valve 2 and the suction side of the compressor 1. In addition, a heating pipe 9 is branched from between the check valve 5 and the expansion valve 6, and downstream of the check valve 8 via the two-way valve 10 and the refrigerant heater 11 to the suction side of the compressor 1. It is connected. A burner 12 is provided near the refrigerant heater 11. Further, a refrigerant heater inlet sensor 13 is provided at the inlet and outlet of the refrigerant heater 11, respectively.
And refrigerant heater outlet sensor 14 is installed, refrigerant heater
The refrigerant temperatures at the inlet and outlet of 11 are measured. A room temperature sensor 15 for measuring the room temperature is provided at the suction port of the indoor heat exchanger 7.

During the cooling operation, the two-way valve 10 is closed, and the refrigerant discharged from the compressor 1 is sent to the outdoor heat exchanger 3 through the four-way switching valve 2 as shown by the broken arrow in the figure. After being condensed there, the pressure is reduced by the pressure reducing device 4 and the expansion valve 6 and flows into the indoor heat exchanger 7, where it expands and performs the cooling operation of the room, and then returns to the compressor 1.

During the heating operation, the two-way valve 10 is opened, and the refrigerant discharged from the compressor 1 is sent to the indoor heat exchanger 7 through the four-way switching valve 2 as shown by a solid arrow in the drawing. ,
Therefore, the interior of the room is heated by radiating heat, and then the burner is passed through the heating pipe 9 to the refrigerant heater 11.
After being heated in 12, it is returned to the compressor 1.

However, in such a heating operation, if the amount of circulating refrigerant is reduced to a required amount or less, the refrigerant heater
There is a problem in that abnormal heating occurs in 11 and the durability of the refrigerant heater 11 deteriorates. Therefore, combustion control of the burner 12 is performed based on the refrigerant temperature at the outlet of the refrigerant heater 11 measured by the refrigerant heater outlet sensor 14 provided on the outlet side of the refrigerant heater 11.

FIG. 3 is an explanatory diagram of an example of performing the above-described combustion control. The curve in the figure shows the time change of the refrigerant temperature TEO at the outlet of the refrigerant heater 11 measured by the refrigerant heater outlet sensor 14, and the TEO rises during the operation of the burner 12 now. . When the TEO reaches a preset abnormal temperature T ₁ (point A in the figure), the combustion of the burner 12 is stopped. Along with this, TEO starts to fall and the reburn temperature T
_When the temperature reaches ₂ (point B in the figure), combustion of the burner 12 starts, and the heater automatically returns. On the other hand, the number of times of stopping the combustion is measured, and various controls are performed according to the number of times. Then, in order to prevent the durability of the equipment from being reduced due to the repetition of abnormal overheating, when the number of times exceeds a certain number of times, the entire heater is stopped to prevent the automatic recovery from being performed. ing.

(Problems to be Solved by the Invention) However, even if the heating operation becomes normal immediately after the abnormal overheating of the refrigerant heater occurs,
The number of combustion stops before normal operation is recorded as is,
Next, when abnormal overheating occurs, the number of times of combustion stoppage caused by the overheating is added to the number of times of previous stoppage of combustion. Furthermore, abnormal overheating frequently occurs even when the refrigerant circulates insufficiently due to a slow leak at the four-way switching valve and the stop valve,
There is a problem that the reburning of the burner is repeated and the equipment is easily stopped completely.

The present invention has been made in view of the above-described problems, and provides a control method of a refrigerant heating / cooling / heating machine that prevents the entire device from being stopped more than necessary and improves the durability of the device. The purpose is to do.

[Configuration of the invention]

(Means for Solving the Problems) The present invention measures a refrigerant temperature at an outlet side of a refrigerant heater,
In the control method of the refrigerant heating type air conditioner that performs the burner combustion control for stopping the burner by comparing the outlet side refrigerant temperature with the abnormal temperature set value of the refrigerant heater, the refrigerant temperature is equal to or higher than the abnormal temperature set value. The number of times the burner stops burning due to the rise in the temperature is measured, and in accordance with the number of stops, the burner combustion control method is changed, and when the room temperature after the burner stops burning is equal to or higher than a preset temperature. Resets the number of stops to 0, performs the refrigerant recovery operation when the number of stops reaches a specified number, and when the number of stops exceeds a specified number,
The combustion operation of the burner is stopped.

(Operation) At the start of heating operation or during heating operation, if the indoor temperature is lower than the indoor set temperature, the burner starts burning. At that time, the refrigerant heater overheats and the refrigerant heater outlet side When the refrigerant temperature becomes equal to or higher than the abnormal temperature set value, the combustion of the burner is stopped, and the number of times the combustion is stopped is counted. When the number of times of combustion stoppage is smaller than the preset number of times, when the refrigerant temperature at the refrigerant heater outlet side becomes equal to or lower than the preset reburn temperature,
The indoor temperature is compared with the indoor set temperature again, and if the indoor temperature is equal to or lower than the set temperature, the burner is re-burned, and this is repeated thereafter. On the other hand, when the number of times of combustion stoppage is equal to the predetermined number of times, the refrigerant recovery operation is performed, and then the indoor temperature and the indoor set temperature are compared again. Further, when the number of times of combustion stop is equal to or more than the predetermined number of times, the entire apparatus is stopped. On the other hand, when the temperature of the refrigerant becomes equal to or lower than the re-combustion temperature after the combustion of the burner is stopped, if the room temperature is equal to or higher than the indoor set temperature, that is, if heating is being performed as predetermined, the number of times of combustion stop is 0 Is reset to

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

The configuration of the refrigerant heating type air conditioner / heater of the present invention has the same configuration as that shown in FIG. 2, and a detailed description thereof will be omitted.

FIG. 1 is a flowchart showing the operation of the air conditioner in the present invention. When the heating operation is started (A), the number n of times of combustion stoppage due to abnormal overheating of the burner 12 becomes zero.
(B). Next, the indoor temperature T _A measured by the room temperature sensor 15 is compared with a preset indoor set temperature T _S (C). Here, if T _A <T _S , combustion of the burner 12 is started. (D), then performs a refrigerant temperature TEO of the outlet portion of the refrigerant heater 11 is measured by the refrigerant heater outlet sensor 14 is compared with a preset abnormal temperature setpoint T ₁ (E).
Here, if a TEO ≧ T _1, i.e., refrigerant heater 1
If it is determined that 1 has caused abnormal overheating, the combustion of the burner 12 is stopped (F), and the number n of times of stopping the combustion is counted (G). Therefore, when the refrigerant temperature reaches the re-combustion temperature T ₂ below, yet when the room temperature is below the set temperature, the burner 12 is reignited, subsequent similar operation is repeated. That is, in G, it is determined whether or not the calculated new number of times of combustion stop n reaches a preset number of times of starting the refrigerant recovery operation, for example, six (H). Here, when the combustion stop number n has not reached 6 times, compared to the re-combustion temperature T ₂ that has been set to the outlet side of the coolant temperature TEO of the refrigerant heater 11 advance (I), TEO ≦ when it becomes a T _2, feedback and C, again by comparing the indoor temperature T _a and the indoor set temperature T _S, when the room temperature is below the set temperature, the burner 12 again
Is repeated until the number n of times of stopping combustion reaches a predetermined number of times, that is, six times. In addition, in H, when the number n of times of combustion stoppage has reached 6, the refrigerant recovery operation is performed (K). That is, the four-way switching valve 2 is operated in a heating mode state, the two-way valve 10 is closed, and operation is performed for a certain period of time,
The refrigerant that has accumulated in the outdoor heat exchanger 3 is recovered in the heating circuit. Thereafter, the room temperature T _A is compared with the room set temperature T _S again, and it is detected whether or not the room temperature has reached the room set temperature at that time (C). Then, when the room temperature is equal to or lower than the room set temperature, the burner 12 is ignited again.

On the other hand, if the room temperature T _A is equal to or higher than the set temperature T _S , it is determined that the heating operation is in a normal operation state, and the number n of times of combustion stop is reset to 0 (M). Thereafter, the ON / OFF control of the compressor 1 and the refrigerant heater 11 is performed by comparing the indoor temperature T _A with the indoor set temperature T _S, and the indoor temperature is controlled. Further, when the number n of times of the combustion stoppage exceeds six, the entire device is stopped (L), and the device is inspected.

〔The invention's effect〕

As described above, according to the present invention, even when abnormal overheating of the refrigerant heater occurs, if the indoor temperature is equal to or higher than the indoor set temperature, it is determined that the heating operation is operating normally, and the combustion is stopped. By resetting the number of times to 0, the number of times of combustion stoppage can be measured again from 0,
Unnecessary stoppage of the entire device can be prevented, and operation continuity can be improved. Further, when the number n of times of combustion stoppage reaches a predetermined number of times set in advance, the refrigerant leaked inside can be recovered by performing the refrigerant recovery operation. And the like can be improved.

[Brief description of the drawings]

FIG. 1 is a flowchart of the operation of the air conditioner in the present invention, FIG. 2 is a cycle diagram of a refrigerant heating air conditioner, and FIG. 3 is an explanatory diagram of conventional combustion control. DESCRIPTION OF SYMBOLS 1 ... Compressor, 2 ... 4-way switching valve, 3 ... Outdoor heat exchanger, 4 ... Decompression device, 5 ... Check valve, 6 ... Expansion valve, 7
... indoor heat exchanger, 8 ... check valve, 9 ... heating pipe,
10 ... two-way valve, 11 ... refrigerant heater, 12 ... burner, 13 ...
… Refrigerant heater inlet sensor, 14… Refrigerant heater outlet sensor, 15… Room temperature sensor.

Claims (1)

(57) [Claims] 1. A refrigerant temperature at an outlet side of a refrigerant heater is measured,
In the control method of the refrigerant heating type air conditioner that performs the burner combustion control for stopping the burner by comparing the outlet side refrigerant temperature with the abnormal temperature set value of the refrigerant heater, the refrigerant temperature is equal to or higher than the abnormal temperature set value. The number of times the burner stops burning due to the rise in the temperature is measured, and in accordance with the number of stops, the burner combustion control method is changed, and when the room temperature after the burner stops burning is equal to or higher than a preset temperature. Resets the number of stops to 0, performs the refrigerant recovery operation when the number of stops reaches a specified number, and when the number of stops exceeds a specified number,
A method for controlling a refrigerant heating / cooling machine, characterized by stopping a combustion operation of a burner.