JPS61228245A - Air conditioner - Google Patents

Abstract

PURPOSE:To prevent the rise of humidity in a rooms during the long-term downtime of a compressor by a method in which in the forced operation of the compressor during chilling operation, the compressor is continuously operated for a given time period, and the speed of a fan in room is decelerated. CONSTITUTION:An air conditioner is provided with a room temperature sensor 13, a temperature setter 14, a temperature difference sensor 15 to detect the temperature differences of plural zones set between the sensor 13 and the setter 14, a downtime sensor 18 to detect the time from arrival of room temperature to a set value to the stoppage of a compressor 16, a forced operation time sensor 19 to detect the forced operation time of the compressor 16, and a variable indoor fan 17. During chilling operation, when the stoppage time of the compressor 16 is long, the decelerating operation of the indoor fan 17 is forcibly made for a given time period to maintain the temperature of room, thereby preventing the rise of humidity. During the usual operation where the downtime of the compressor 16 is comparatively long, since the set speed of the fan 17 is controlled to a standard performance, comfortable chilling according to the load of air conditioner can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an air conditioner that prevents a rise in humidity when a compressor is stopped during cooling operation and improves comfort.

2. Description of the Related Art In recent years, in the cooling operation of an air conditioner, it has become a major issue to improve comfort by minimizing the increase in humidity while the compressor is stopped.

The conventional air conditioner as described above will be described below with reference to the drawings.

Figure 4 shows a block diagram of a conventional air conditioner (not shown). 01 is a power supply, and 2 is an AC power
This is a rectifier circuit that rectifies the power supply.

Reference numeral 3 denotes a room temperature sensor that detects the indoor temperature, 4 a temperature setting device that sets the indoor temperature, and 6 a temperature difference detection device that detects the temperature difference between the room temperature sensor 3 and the temperature setting device 4. 6
7 is a compressor, 7 is an indoor fan, and 8 is a stop time detection device that detects the stop time of the compressor 6 after reaching the temperature set value of the indoor temperature during cooling operation. Furthermore, after receiving the signal from the temperature difference detection device 6, the control device 9 grasps the signal from the stop time detection device 8 and gives operation/stop commands to the compressor 6 to control cooling.

The operation of the air conditioner configured as above will be described below.

First, during cooling operation, the room temperature is detected by the room temperature sensor 3,
A temperature difference detection device 6 compares the temperature difference between the temperature detected by the room temperature sensor 3 and the temperature setting device 4, and when the temperature difference becomes O'C, a set temperature attainment signal is given to the control device e. Immediately after receiving the temperature attainment signal, the control device 9 issues a stop command to the compressor 6. Thereafter, until the temperature difference reaches a predetermined value which is the operating temperature of the compressor 6, or after the compressor 6 is stopped, until a forced return signal is given from the stop time detection device 8.
The compressor 6 remains stopped. Here, in response to the forced return signal from the stop time detection device 8, the control device 9 controls the compressor 6.
issue a forced operation order.

In this case, the fan speed of the room 77 remains at the set speed. This forced operation of the compressor 6 is continued until the indoor temperature reaches the set temperature.

Problems to be Solved by the Invention However, in the above configuration, the compressor is forced to operate and the indoor fan is operated at the set speed when the indoor temperature is close to the set temperature, so the cooling capacity is large and the indoor temperature is close to the set temperature. The temperature is reached faster and the compressor runs for less time.

Therefore, the rise in indoor humidity cannot be suppressed, causing discomfort, and the operating time of the compressor is extremely short.
This also has the disadvantage of shortening the life of the compressor.

In view of the above-mentioned drawbacks, the present invention has been developed to continuously operate the compressor for a predetermined period of time and reduce the speed of the indoor fan during forced operation of the compressor during cooling operation. To provide an air conditioner that prevents.

Means for Solving the Problems In order to solve the above problems, the air conditioner of the present invention sets the temperature difference between a room temperature sensor and a temperature setting device in a plurality of zones, and detects the temperature difference between the zones. A temperature difference detection device for detecting a temperature difference, a stop time detection device for detecting the time from a compressor stop after the indoor temperature reaches a temperature set value during cooling operation, a forced operation time detection device for detecting a forced operation time of the compressor, and It consists of a variable speed indoor fan.

According to the above-described configuration, the present invention forcibly decelerates the indoor fan for a predetermined period of time to maintain room temperature and prevent a rise in humidity when the compressor is stopped for a long time during cooling operation. In the normal case where the machine stop time is relatively short, the indoor fan can be controlled at standard capacity operation at the set speed, and comfortable cooling can be obtained according to the air conditioning load. An air conditioner according to an embodiment will be described with reference to the drawings.

FIG. 1 shows a block diagram of an air conditioner according to an embodiment of the present invention. In FIG. 1, 11 is a power supply, 12 is a rectifier that converts AC voltage to DC, 13 is a room temperature sensor that detects indoor temperature, 14 is a temperature setting device that sets the indoor temperature, and 15 is room temperature sensor 13 and temperature This is a temperature difference detection device that sets the temperature difference with the setting device 14 in a plurality of zones and detects the temperature difference in the zones. 16 is a compressor, 17 is a variable speed indoor fan, 18 is a stop time detection device that detects the stop time of the compressor 16 after the indoor temperature reaches a temperature set value during cooling operation of an air conditioner (not shown); 19 is a forced operation time detection device that detects the forced operation time of the compressor 160. Further, after receiving the signal from the temperature difference detection device 16, the signals from the stop time detection device 18 and the forced operation time detection device 19 are grasped, and operation commands are given to the compressor 16 and the indoor fan 17 respectively to perform cooling control. It is composed of a control device 20 that performs the following operations.

Regarding the cooling control of the air conditioner configured as above, an example of the correspondence between the operating states of the compressor 16 and the indoor fan 17 and the control characteristics for the set temperature and indoor temperature will be shown below, and the operating states will be explained. do.

First, the temperature difference between the set temperature and the room temperature is divided into three zones. In other words, Zone B is the range where the room temperature is 2°C or more higher than the set temperature, and Zone B is the range where the room temperature is more than 2°C higher than the set temperature.
zone, and the range below 0°C is zone C. Table 1 shows the ranges and temperature differences of these three zones.

Table 1 Furthermore, in the range of these three zones, the operation/stop commands for the compressor 1e and the indoor fan 17 are made to correspond as shown in Table 2, depending on the cooling operation state.

That is, if the room temperature is in the C zone during normal operation of the air conditioner, the temperature difference detection device 16 determines that the room temperature has reached the set temperature, and provides a reaching signal to the control device 20. Upon receiving this arrival signal, the control device 2o stops the operation of the compressor 16, and instructs the fan speed of the indoor fan 17 to continue the set operation. If the temperature is in the low zone, a signal is given to the control device 20 indicating that the temperature has reached a temperature slightly higher than the set temperature. Then, the control device 2o determines that cooling operation is necessary, and gives an operation command to the compressor 16, and also instructs the indoor fan 17 to continue operating at the set speed.

In addition, if the room temperature is still in zone B after 8 minutes have passed since the compressor stopped, the control device 20 determines that the humidity in the room has increased significantly while the compressor 16 is stopped, and issues a forced operation command to the compressor 16. This means giving a command to the indoor fan 17 to reduce the fan speed. Note that if the room temperature enters the C zone during forced operation of the compressor 160, the control device 2o determines that there is no need to perform air conditioning, and sets the predetermined operation time 3 from the forced operation time detection device 19. Upon receiving a signal that the minute has elapsed, the compressor 16
This means giving a stop command to the Also, if the room temperature enters the low zone during forced operation, the control device 2o determines that the air conditioning load is increasing and that the cooling capacity must be increased, and changes the indoor fan 17 from decelerated speed operation to the set speed. This means issuing a driving command to switch.

As described above, by dividing the temperature difference between the set temperature and the indoor temperature into multiple zones and making the range of these zones correspond to the cooling operation status, it is possible to eliminate the increase in indoor humidity when the compressor is stopped for a long time. At the same time, in forced operation,
Capacity-saving operation by reducing the speed of the indoor fan completely eliminates discomfort and allows the user to easily obtain the comfort of cooling air conditioning.

Effects of the Invention As described above, the present invention divides the temperature difference between the set temperature and the indoor temperature into a plurality of zones, sets the temperature difference, and corresponds to the cooling operation state, and after the room temperature reaches the set temperature, the predetermined compression is performed. Taking into account the machine stop time and compressor forced operation time, the compressor operation command is issued and the fan speed of the indoor fan is automatically converted to perform cooling control that appropriately grasps the air conditioning load. The increase in indoor humidity during stoppage is suppressed as much as possible, thereby improving comfort, which has great practical effects.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an air conditioner according to an embodiment of the present invention, FIG. 2 is a flowchart showing the operation of the air conditioner, FIG. 3 is a time chart of the air conditioner, and FIG. 4 is a conventional air conditioner. FIG. 2 is an example block configuration diagram. 13...Room temperature sensor, 14...Temperature setting device, 15...Temperature difference detection device, 16...
...Compressor, 17...Indoor fan, 18...
... Stop time detection device, 19 ... Forced operation time detection device, 20 ... Control device. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Diagram (Returned to the Curse Nuheed 4・υ 3rd Dialogue)

Claims (1)

[Claims] A compressor, a variable speed indoor fan, a room temperature sensor that detects indoor temperature, a temperature setting device that sets the indoor temperature, and temperature differences between the room temperature sensor and the temperature setting device are set in a plurality of zones, a temperature difference detection device that detects a temperature difference between the zones; a stop time detection device that detects a time elapsed after the compressor stops after the indoor temperature reaches a temperature set value during cooling operation; an operation time detection device that detects the re-operation time of the compressor, and receives signals from the temperature difference detection device, the stop time detection device, and the operation time detection device, and sends an operation/stop command to the compressor, and a fan to the indoor fan. It consists of a control device that outputs automatic speed reduction switching. During cooling operation, the compressor is operated until the room temperature reaches the set temperature, and the indoor fan is operated at the fan speed setting. After the set temperature is reached, only the compressor is operated. If the indoor temperature is lower than the ON temperature of compressor operation and higher than the set temperature, the compressor will be forced to operate continuously for a specified period of time after the compressor has stopped, and at the same time An air conditioner that automatically reduces the speed of the indoor fan.