JPH03160260A - Controlling method for operation of air conditioner - Google Patents

Abstract

PURPOSE:To eliminate stagnation of warm air on the ceiling surface air at the time of starting a compressor and to settle the room temperature in a space to be conditioned just at a target value by limiting an instructed speed to a capacity variable type compressor to a predetermined speed or lower after air temperature of the space to be conditioned reaches a set target temperature. CONSTITUTION:Compressor speed determining means for determining a compressor speed according to a load obtained according to the value of a room temperature measuring sensor of a space to be conditioned and a target room temperature of the space to be conditioned sets a compressor speed to 3600rpm even if the compressor designating speed is 7200rpm, and sets it to 4800rpm after 4min. Further, if a designating speed after 4min is still 7200rpm, the compressor speed is set to 6000rpm, and the compressor is rotated at the final target speed of 7200rpm after 4min. Since the speed of the compressor is gradually raised under the control as time is elapsed, a blower motor is rotated at a low speed under a cold draft preventive control, the speed of the blower motor becomes a normal speed before warm air starts to stagnate on a ceiling surface to eliminate the stay of the hot air on the ceiling surface.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to improving the accuracy of room temperature control of a room air conditioner during stable heating operation.

Conventional technology Conventional room temperature control during heating operation
There were various types of air conditioners, ranging from those that focused only on room temperature to those that took into account the discomfort caused by cold air, that is, cold drafts.In particular, small wall-mounted room air conditioners are installed near the ceiling of the air-conditioned space, so the air vents Since the warm air remains near the ceiling surface, air with a temperature higher than the average room temperature is drawn into the air conditioner, and there is a gap between the temperature of the sucked air and the average room temperature. For this reason, the temperature difference between the intake temperature and the average room temperature may be controlled assuming that it is a uniform temperature difference, or it may be controlled by assuming that the temperature difference between the intake temperature and the average room temperature is a constant temperature difference, or that the temperature difference is a constant temperature difference depending on the output of the blower that controls the air blown into the air conditioned space by the air conditioner. In addition, in order to prevent cold drafts, when the temperature of the blown air is low, the blower is operated at a lower output than the specified blower output to prevent discomfort caused by cold air. In recent years, various types of air conditioners have appeared, and when the air conditioners suck only the air near the ceiling surface, once the room temperature reaches the target value and the compressor stops and then restarts, the compressor stops. At the same time, the temperature of the blown air decreases, and the blower output is operated at a lower output than the specified output in order to prevent cold drafts. When a drop in the room temperature is detected and the compressor restarts, the temperature of the blown air starts to rise.The blown air that has started to rise is carried to the air-conditioned space by the blower.Power tBlower output The air conditioner is operating at a lower output than the specified output.It is not carried to the air-conditioned space and remains near the ceiling surface. It gets sucked into the air conditioner. In other words, it inhales the warm air that it blows out (＼ It judges that the temperature of the air-conditioned space has risen, and if the temperature has reached the target value, it stops the compressor, but as a result (＼ There was a problem in which the room temperature in the harmonized space did not rise and stabilized at a temperature that was far from the target temperature. As a countermeasure to this problem (above), it is possible to use a room thermostat that has been in existence for a long time, but since it is outside the structure of an integrated indoor unit, it cannot be used, so some kind of control method is needed. Problems that the invention seeks to solve, even though they are desired to be solved.During heating operation, once the room temperature of the air-conditioned space has reached the target value, the hot air blown out when the compressor is started is in a state where the compressor is in intermittent operation. Due to the stagnation on the ceiling surface, the room temperature in the air-conditioned space cannot be accurately measured as a transient phenomenon.There is also the problem that the compressor cannot be operated intermittently for a short period of time and the room temperature cannot be stabilized at the target room temperature. In view of the above-mentioned problems, the present invention solves the problem of hot air blown out from the ceiling when the compressor is started, and stabilizes the room temperature of the air-conditioned space at the target value by accurately measuring the room temperature of the air-conditioned space. Means for Solving the Problems In order to solve the above problems, the air conditioner operation control method of the present invention includes a variable capacity compressor, condenser, throttling device, and evaporator with rotational speed control. A refrigeration cycle with a container (IW
L, Indoor heat exchanger temperature measurement means, indoor heat exchanger air blower speed change means with multi-stage variable speed control that can arbitrarily select the blowout air volume, indoor heat exchanger blower motor speed regulation means , a sensor for measuring the room temperature of the air-conditioned space, a ratio of the compressor rotation speed that determines the compressor rotation speed based on the value of the sensor for measuring the room temperature of the air-conditioned space and the load determined at the target room temperature of the air-conditioned space.Compressor drive means, time measuring means for measuring the elapsed time from the start of the compressor;
A compressor maximum rotation speed specified hand ratio is established to specify the maximum value of the compressor rotation speed.

Operation Control Method 1 of Air Conditioner of the Present Invention By the above-mentioned structure, the stagnation of the blown air at the ceiling surface at the time of starting the compressor is eliminated.
The room temperature of the air conditioned space can be stabilized to the target value by accurately measuring the room temperature of the air conditioned space. Figure 1 (above) is a schematic diagram of an indoor unit of an air conditioner showing an embodiment of the present invention. The sensor 3 that measures the room temperature is the hot air blowout cL.
．． 4 is a fan for indoor ventilation, 5 is a multi-speed variable speed motor for driving the fan, 6 is an air conditioner installed directly on the wall, and 7 is a ceiling surface. This shows a compressor rotation speed determining means that determines the compressor rotation speed based on the load determined at the target room temperature of the space, and determines the rotation speed instructed to the compressor based on the temperature difference between the measured temperature and the target room temperature. Figure 3 is a flowchart showing the compressor maximum rotation speed regulating means for regulating the maximum value of the compressor rotation speed. Figure 4 shows a means for regulating the rotation speed of the blower motor for the indoor heat exchanger to prevent cold drafts. When the temperature exceeds this point, the temperature of the hot air blown out from the air outlet 3 drops rapidly, and the blower motor is rotated according to the rotation speed regulation means for the indoor heat exchanger blower motor to prevent cold draft shown in Fig. 4. Although the rotation speed of the air-conditioned space decreases, the heating capacity is lost and the room temperature of the air-conditioned space drops, and the compressor adjusts the value of the room temperature measurement sensor of the air-conditioned space and the target room temperature of the air-conditioned space according to the diagram shown in Figure 2. The commanded rotation speed of the compressor is determined based on the load determined by If the rotation speed of the blower motor for the inner heat exchanger is low, the temperature of the hot air blown out from the air outlet 3 rises rapidly and stays near the ceiling surface 7, causing the sensor to turn on and off as shown in the conventional example. Therefore, if the control shown in the flowchart shown in Fig. 3 is used, even if the compressor rotation speed specified in Fig. 2 is 7200 rpm, the rotation speed of the compressor at startup is 3600 rpm.
m and L, 4800 rpm after 4 minutes, and the indicated rotation speed after another 4 minutes? If the rotation speed is 20Orpm, the compressor rotation speed is set to 600Orpm, and after another 4 minutes, the compressor is rotated at the final target rotation speed of 720Orpm. With this control, the rotation speed of the compressor does not increase all at once to high speed, but gradually increases over time.The temperature of the hot air blown out from the air outlet 3 does not increase rapidly, but gradually increases. As a result, the blower motor rotates at low speed under the cold draft prevention control shown in Figure 4, and before the warm air blown out from the air outlet 3 starts to accumulate on the ceiling surface, the rotation speed of the blower motor becomes the normal rotation speed and reaches the ceiling surface. This has the effect of eliminating the stagnation of hot air in the air conditioner.Also, if subsequent fluctuations in air conditioning load are expected to be small, the compressor rotational speed can be increased through multiple stages in sequence. It can be handled even in a restricted area with only one stage.
Furthermore, although the compressor rotational speed may be kept limited at all times, the same effect can be obtained by using the flowchart shown in FIG. 5 instead of the flowchart shown in FIG. 3. By using the machine operation control method, the room temperature can be reliably detected without short circuiting, and the room temperature in the air-conditioned space can be stabilized at the desired temperature. It is possible.

[Brief explanation of the drawing]

Fig. 1 GA Structure of an indoor unit of an air conditioner showing an embodiment of the present invention Fig. 342 An explanation of the compressor rotation speed determining means that determines the compressor rotation speed is shown in Figure 3 (Friend). An explanation of the means for regulating the rotation speed of the blower motor for the indoor heat exchanger is shown in Figure 5 (1).・・・
Indoor heat exchange droplet 2...sensor, 3...blowout 0.4...indoor ventilation fan, 5...
・Motor taco

Claims (5)

[Claims] (1) Equipped with a refrigeration cycle that has a variable capacity compressor, condenser, throttling device, and evaporator with rotation speed control, and a sensor that measures the air temperature in the air-conditioned space and a sensor that measures the air temperature in the air-conditioned space. In an air conditioner equipped with a target temperature setting device that sets a target value and a blower that can arbitrarily select the amount of air blown into the air-conditioned space depending on the temperature of the air-conditioned space, the air temperature of the air-conditioned space is After reaching the target temperature set by the target temperature setting device that sets the target value of the air temperature in the air-conditioned space, the number of rotations instructed to the variable capacity compressor is limited to a certain number of rotations or less. Air conditioner operation control method (2) The condition for limiting the rotation speed specified to the variable capacity compressor to a certain rotation speed or less is fixed to a certain period of time, and after the specified period of time has passed, the compressor will return to the specified rotation speed of the variable capacity compressor. 2. The method of controlling operation of an air conditioner according to claim 1, further comprising returning to normal operation with no maximum rotational speed restriction. (3) The conditions for limiting the number of rotations instructed to the variable capacity compressor to a certain number of rotations or less are fixed for a certain period of time, and after the fixed period of time has passed, the number of rotations instructed to the variable capacity compressor is limited. 2. The air conditioner operation control according to claim 1, wherein the air conditioner operation control returns to normal operation in which restrictions on the compressor rotation speed are removed through a plurality of compressor maximum rotation speed restriction regions in which the compressor rotation speed is gradually relaxed. Method (4) After passing through multiple compressor maximum rotation speed restriction areas that have been gradually eased, the conditions for returning to normal operation with the compressor maximum rotation speed restriction removed are passed through each of the compressor maximum rotation speed restriction areas. 4. The air conditioner operation control method according to claim 3, wherein the time is fixed. (5) The condition for limiting the number of revolutions instructed to the variable capacity compressor to a certain number of revolutions or less is based on the air temperature of the air-conditioned space measured by a sensor that measures the air temperature of the air-conditioned space; The compressor rotation speed determined by the air conditioning load determined by the difference from the target temperature set by the target temperature setting device that sets the target value of the air temperature in the air-conditioned space falls below a certain limited rotation speed. Claim 1, characterized in that when the compressor reaches a maximum rotation speed, the commanded rotation speed to the variable capacity compressor is limited to a certain rotation speed or less, and normal operation is resumed without the maximum rotation speed limit of the compressor. air conditioner operation control method.