JPS6082735A - Heat pump type air conditioner - Google Patents

Abstract

PURPOSE:To enable a defrosting operation to be performed in such a degree as preventing a decrease in room temperature for a user to feel uncomfortable by a method wherein in case that a defrosting signal is outputted from a frosting sensor means during ON/OFF control under a heating operation, the heating operation is forcibly carried out for a specified period of time and thereafter the defrosting operation is started. CONSTITUTION:When a defrosting signal is inputted at a point A during the time of turning-ON of the compressor, a forced heating operation is started at the point A, the heating operation is terminated at the point B where T1+alpha (min) is elapsed from the start point D of the heating operation, and then the defrosting operation is started. The defrosting operation is terminated at the point C, thereafter the air conditioner is returned again to its ON/OFF control condition. When the defrosting is inputted at the point E during a turning-OFF of the compressor, a forced heating operation is started, while said operation is carried out from the point E by a time of T1'+beta (min), terminated at the point F, and the defrosting operation is carried out from the point F to the point G. Extended time alpha during a turning-ON and extended time beta during the turning-OFF may be applied for both cases of the same value or different value and they are set in advance.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a heat pump air conditioner capable of heating and cooling.

(]) [Technical background of the invention and its problems] Conventionally, temperature control of heat pump air conditioners involves comparing the set temperature arbitrarily set by the user with the room temperature detected by a room temperature sensor, etc. (IN/0FT- control is performed. To explain this in terms of heating operation, if the set temperature TO1 is within the permissible fluctuation range a(C), the detected room temperature is TO-
The compressor is ON when it is below α, and the compressor is ON when it is above Tn+α (WF
The temperature is controlled at a constant temperature of 19°C with a small deviation around the center.

Furthermore, in such a heat pump type air conditioner, if the amount of frost on the outdoor heat exchanger exceeds a certain amount during heating operation, the frost sensor will not issue a removal signal.

Since this defrosting signal is given priority over the above-mentioned 0N10FF control signal, the compressor immediately starts defrosting operation regardless of the operating state.

For this reason, when the defrosting operation starts while the compressor is stopped or immediately after restarting, the room temperature decreases significantly.

For example, in Figure 1, defrosting operation is started while the compressor is stopped, and defrosting operation starts at point A (2), completes at point P, and switches to heating operation. .

In the case of Fig. 1, the compressor is stopped (-) and the defrosting operation is started at point A' when the room temperature is decreasing, so the room temperature continues to decrease at the stagnation point when the removal 1Y is completed. Driving is 5 minutes ~ 1
Since the temperature is about 0 degrees Celsius, near the point where the room temperature is the lowest, the room temperature has dropped by 4 to 7 degrees Celsius from the set room temperature.

After this, the air conditioner starts heating operation and the room temperature gradually rises.

During this time, the user could feel the room temperature drop for about 10 minutes, and the user was unable to enjoy a comfortable atmosphere. The purpose of the present invention is to provide a heat pump air conditioner that reduces discomfort caused by a drop in room temperature.

[Summary of the invention]

The present invention provides a defrosting signal that is output by a combination of a frost sensor, a lid box sensor, and a time condition during ON/OFF control of the compressor, which is performed by comparing the set room temperature and the detected room temperature during heating operation. (3) When the heat pump type air conditioner is outputted, the heat pump type air conditioner is characterized in that it includes a control means that starts defrosting operation after forcibly performing heating operation for a predetermined period of time.

[Embodiments of the invention]

It shows the connection of the device. The control device 1 is a microcomputer, R, O
It is composed of M, etc. and performs comparisons and calculations. A room temperature sensor 2, a room temperature setting device 3, and a frost formation sensor 4 are input to this control device 1. Room temperature sensor 2 is a thermistor,
The room temperature setting device 3 allows the user to set the desired temperature, and is provided in a remote control or the like. In addition, the four mating sensors are indoor heat exchanger temperature sensors, which indirectly detect frost formation on the outdoor heat exchanger.

The control device 1 processes these inputs and performs relay control of the compressor 5, indoor blower 6, outdoor blower 7, and four-way valve 8.

The operation of this embodiment during heating operation will be described below.

FIG. 3 is a 70-chart of the operation of the control device 1. (4) First, when the air conditioner is turned on, the outputs of the room temperature sensor 2 and the room temperature setting device 3 are compared. At this point, if the set wetness change is above room temperature, the comparison output becomes NO, and the process moves to the defrosting pattern P2 while the compressor is OFF, that is, the defrosting 1F pattern P2 while the thermostat is OFF. Also,
If the set moisture protection is higher than the room temperature, the comparative output becomes YES, the compressor, the indoor/outdoor blower, etc. are turned on, and the heating operation is started. After this,
The control device 1 shifts to the defrosting pattern P during thermo-on.

In the defrosting sensor P1, it is first determined whether the defrosting signal from the defrosting sensor is being input.

If this signal is not input, the heating operation will be continued until the compressor is turned off by normal room temperature comparison.If the defrost signal is input here, the compressor will be operated to determine the forced heating time. Time calculation/comparison 1 is performed. In this embodiment, the previous compression mON time (
(minutes) T1, the cycle of the compressor when the defrost signal is input ()N time (minutes) T2, heating operation continues (events open) (
5) When the fixed value (minutes) T3f] - T' (= T1+, the forced heating time is calculated, and when T2 > T?l, the forced heating operation ends and the defrosting operation starts. α
(Minutes) is the ON extension time and is set at an appropriate value. Then, this discharge operation is controlled by time. .

Furthermore, while the compressor is off, the defrost signal is constantly monitored in the thermostat nF'l';14 defrost pattern P2. At this time, if the defrost signal is not input, the RFlchir compressor is turned on and forced heating operation is started.

Next, compressor operating time comparison 2 is performed. This is calculated by calculating the forced heating operation time (minutes) T3' from the previous compressor ON time (minutes) 'T1° before inputting the defrosting signal and the OFF extended time β as 73' = Tl' + β, and then calculating the actual If the comparison with the forced heating operation time T2' becomes Tzo>T3', the heating operation is ended, and after that, the defrosting operation is started, and after performing this defrosting operation for a predetermined time, the compressor is turned off. , normal ON/OFF control is performed (6) Wanero. In addition, this ON extension time", OT;"F
'The time extension time β+=i may be the same value or a different value, and is set in advance.

As described above, in the control device 1, the compressor ("JN", OF
The defrost signal is constantly monitored regardless of F time, and the defrost signal while the compressor is ON is processed by the defrost pattern P1 while the thermostat is ON.
While the compression e is OFF, processing is performed using the thermo-OFF erasure pattern P2.

FIGS. 4 and 5 show graphs of the operation and room temperature changes of the heat pump type air conditioner of this example. This figure 4 shows that the defrost signal is not input while the compressor is ON, but 0N10FF control is performed up to point A in the figure, and the defrost signal is not input at point A while the compressor is ON. There is.

Therefore, forced heating operation is started from point A, and TI +d (minutes) determined by the defrosting pattern P1 while the thermostat is ON.
Heating operation continues. At this time, the expansion is approximately 3 minutes, and the room temperature will rise by about 2 to 3 C above the set room temperature due to this heating operation.

Then, at point B, where T1+α (minutes) have elapsed from the starting point of the heating operation, the heating operation ends and the defrosting operation (7) is started. This defrosting operation ends at point C, after which the air conditioner returns to ON/OFF control again.

Next, in FIG. 5, a defrost signal is input into the compressor ClFF, and the defrost signal is input at point E in the figure. Then, forced heating operation is started according to defrosting pattern P2 while the thermostat is OFF, forced heating operation is performed for T1°+β (minutes) from point E, ends at point F, and defrosting operation is performed from point F to point G. It will be done.

As described above, according to this embodiment, the heating operation is forcibly performed before the division operation is started, and the defrosting operation is started after the room temperature has risen, so the user may not feel discomfort. Do 1
1. It is possible to operate at 1 Nτ without causing any decrease in room temperature.

Since the forced heating operation before the defrosting operation is set by time, the defrosting operation is reliably performed after the predetermined time has elapsed.

In addition, since this time setting changes according to the previous σ) ON time, it is possible to control the room temperature very appropriately, and there is no problem such as the room temperature rising abnormally due to forced heating time being too long. Next, as a second embodiment, a heat pump air conditioner in which the forced heating time is determined by the refrigerant temperature (pressure) on the high pressure side of the refrigeration cycle is illustrated in Fig. 6.

I will clarify.

In this embodiment, the high-pressure side refrigerant temperature (pressure) is under constant ON/OFF control until it reaches a predetermined point, and when the removal signal is input at the Sakaki point, forced heating operation is started. ing. This forced heating operation has been switched to the same operation.

Then, near the 4th point at the start of defrosting, the refrigerant can be shortened to a short distance.

In addition, this control is not a comparison of high pressure (11 refrigerant temperature and pressure) and a set value t, but the difference between the refrigerant temperature (pressure) at the time of compressor startup, the high-pressure side refrigerant temperature (pressure), and the high-pressure side refrigerant temperature (pressure) n. This can be done by comparing the set values t and t' (9).Furthermore, more detailed control is possible by changing the set values t and t' in inverse proportion to the wind direction of the indoor air outlet. .

〔Effect of the invention〕

The present invention forcibly performs heating operation for a predetermined period of time before starting defrosting operation to raise the room temperature before starting defrosting operation, so that the room temperature during defrosting operation does not drop significantly from the set room temperature. This has the effect of allowing you to drive in a comfortable condition with the room temperature at the lowest setting.

[Brief explanation of drawings]

Fig. 1 is a graph showing room temperature changes during heating operation of a conventional heat pump type air conditioner and a diagram showing the operating state of the compressor at that time. Fig. 3 is a flowchart showing the control procedure of the air conditioner, and Figs. 4 and 5 are graphs showing changes in room temperature during heating operation of the air conditioner, and graphs showing the changes at that time. FIG. 6 is a diagram showing the operating state of the compressor, which is a heat pump type (]) which is the second embodiment of the present invention. A graph showing room temperature changes during heating operation of the air conditioner and continuous operation of the compressor at that time. It is an f diagram showing the state and a graph showing the temperature change of the white handed heat exchanger at that time. 10.Control number position 2...Room temperature sensor 3...Room temperature setter 4...Frost sensor 5...Compressor agent Patent attorney Noriyuki Gosuke Chika (and 1 other person) (11) Fig. 1 (a) FF Figure 5 (1) Set temperature - Temperature source temperature 1 : : ゛: F・1 Dark Figure 6 (a)

Claims (1)

[Claims] 1. Comparing the set room temperature and the detected room temperature and turning off the compressor to 0V
In a heat pump type air conditioner that is being controlled, if a defrost signal is output from the frost detection means during ON/OFF control during heating operation, the defrost operation will be terminated after forced heating operation for a predetermined period of time. 2. The control means stores the time required for at least one of the previous ON/OFF operations, and starts the defrosting signal by outputting a defrosting signal. The heat pump type air conditioner according to claim 1, wherein the duration of the forced heating operation is determined according to this required time.