JPS6255064B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an air conditioner capable of cooling operation, and more particularly to an air conditioner capable of effective dehumidification operation in a normal cooling cycle. In conventional air conditioners that can perform dehumidifying operation in addition to cooling operation, for example, two heat exchangers are installed on the indoor side for effective dehumidification, and one heat exchanger is used during dehumidifying operation. The container is used as a reheater. Therefore, unlike the cooling-only type, the conventional device requires an extra circuit switching valve and heat exchanger with a complicated structure, making the manufacturing cost extremely high. In view of the above, the present invention enables dehumidifying operation to be performed effectively in a normal cooling cycle without using a reheater or a circuit switching valve, etc., and reduces the manufacturing cost of a device that can perform both cooling and dehumidifying operations. The purpose is to make the air conditioner only about the same level as a cooling-only type. In order to achieve this object, the present invention provides an air conditioner capable of cooling operation, as shown in the functional block diagram of FIG. Among them, an area determination circuit 6 that determines the area during dehumidification operation;
The ratio of the operating time to the stop time of the compressor 4 is individually set for each region of the region determining circuit 6 to be large or small corresponding to the relative humidity and room temperature of each region, and the region determining circuit 6 A configuration having an intermittent operation means b for causing the compressor 4 to operate intermittently at the ratio corresponding to the region determined in , and a blower operation means c for causing the compressor 4 to blow air at a very low speed during intermittent operation. By intermittent operation of the compressor at a ratio corresponding to the area during dehumidification operation and at the same time operating the air at an ultra-low speed, dehumidification operation can be performed while minimizing changes in room temperature during a normal cooling cycle. making it possible. Embodiments of the present invention will be described in detail below with reference to the drawings. First, the principle of dehumidification operation of the present invention will be explained. That is, in the present invention, since the temperature is high at the start of operation, such as in summer, the compressor is operated for a long time to rapidly lower the temperature and eliminate the heat.
Shorten the operating time of the compressor to reduce changes in room temperature and lower humidity. On the other hand, if the room temperature is low during the rainy season, the humidity will be high at the start of operation, so to prevent the room temperature from changing too much, the compressor operation time will be shorter than in summer, but it may be longer to some extent. After the air conditioner has reached a certain level of comfort, the compressor operation time is shortened to reduce changes in room temperature and lower the humidity, allowing dehumidifying operation to be performed even during the normal cooling cycle. There is. As described above, the present invention has a feature in that an appropriate dehumidifying operation for summer or rainy season can be performed in a normal cooling cycle. Next, a device that realizes the principle of the dehumidification operation will be specifically explained. FIG. 1 is a cooling cycle diagram in a cooling device included in an embodiment of the present invention. In FIG. 1, reference numeral 1 is an outdoor heat exchanger (condenser), 2 is an expansion valve, 3 is an indoor heat exchanger (evaporator), 4 is a compressor, and 5 is an indoor blower. In this embodiment, in this cooling cycle, the operating time of the compressor 4 is changed and controlled as described below, while the indoor blower 5 is rotated at a very low airflow rate that is not used during cooling, thereby performing a dehumidifying operation. FIG. 2 is a block circuit diagram of an embodiment of the present invention in which the operations of the compressor 4 and indoor blower 5 of FIG. 1 are controlled to enable dehumidifying operation in a normal cooling cycle. In FIG. 2, reference numeral 6 denotes a region determination circuit that determines the region during dehumidification operation among a plurality of regions set based on indoor relative humidity and room temperature. For this area, as shown in the psychrometric diagram in Figure 3, the relative humidity should be kept below 65%.
Divide between 65% and 80% and above 80%, and also set the room temperature to 18%.
below ℃, between 18℃ and 22℃, between 22℃ and 25℃, 25℃
By dividing the temperature between 28°C and 28°C and above 28°C, there are a total of 8 regions from A to H. Then, the area determination circuit 6 receives the output from the room temperature detection circuit 7,
Based on the output from the relative humidity detection circuit 8, it is determined in which region from A to H the indoor condition is in during the dehumidifying operation. Next, in this embodiment, when starting the dehumidifying operation, the compressor is operated intermittently at an operating ratio corresponding to the determination area, that is, at a ratio obtained by dividing the operating time of the compressor by its stop time. In this regard, the compressor is not operated intermittently immediately after the dehumidifying operation is started, but is operated continuously until the initial operating conditions are met. Therefore, in this example,
A circuit 9 for initial operating conditions is provided. This circuit 9 includes a temperature drop detection circuit 10, a humidity detection circuit 11, and a timer 12 for measuring operating time. That is, when the temperature drop detection circuit 10 detects a predetermined temperature drop, when the humidity detection circuit 11 detects that the indoor relative humidity has reached a predetermined value, or when the operation time measurement timer 12 detects the initial operation. When there is an output indicating that the time has elapsed, the compressor operates intermittently at an operating ratio corresponding to the region at the start of the dehumidifying operation. Reference numeral 13 denotes a region determination circuit 6 when the output when the initial operation condition is satisfied is inputted from the circuit 9.
A command signal is sent to the compressor operation/stop relay 14 to cause the compressor to operate intermittently at an operating ratio corresponding to the region determined in , and at the same time, a command signal to cause the indoor blower to operate at a very low air speed is sent to the air volume control relay 15. Send to. Reference numeral 16 denotes a cooling/dehumidification changeover switch. When the switch 16 is switched to the dehumidification side, the control circuit 13 performs the above operation, and when the switch 16 is switched to the cooling side, the control circuit 1
3 sends a command signal to the compressor operation/stop relay 14 to cause the compressor to perform normal cooling operation, and also sends a command signal to the air volume control relay 15 to rotate the indoor blower at an air volume of ultra-low speed or higher. In addition, the initial operating conditions corresponding to each region from A to H, and the operating time (ON) and stop time (OFF) for intermittent operation of the compressor are shown in the table below.

[Table] Next, the dehumidification operation when the room temperature is in the first region (A) at the start of dehumidification will be described with reference to FIG. First, the cooling/dehumidification changeover switch 16 is switched to the dehumidification side and dehumidification operation is started. Upon this start, an area determination signal indicating that the area at that time is in the first area (A) is input from the area determination circuit 6 to the control circuit 3, and at the same time, the control circuit 13 inputs an area determination signal to the control circuit 3.
5, a blowing operation command signal with a very low speed air volume is sent, this relay 15 is turned on, and a blowing operation with a very low speed air volume is performed. On the other hand, under the initial operating conditions according to the table above, until either the indoor relative humidity reaches 65% RH, the indoor temperature drops by 3°C, or the operating time has elapsed for 15 minutes, The compressor is operated continuously, and when a signal indicating that the satisfaction is satisfied is inputted to the control circuit 13 from both the detection circuits 10 and 11 or the timer 12 [time t ₁ in FIG. 4], an intermittent operation command signal for the compressor is issued. From the control circuit 13 to the compressor operation/stop relay 14
sent to. This intermittent operation command signal turns the compressor on and off with an off time of 6 minutes first and an on time of 4 minutes in the table above, so the compressor is not operated for the first 6 minutes in Figure 4. is stopped and the room temperature rises as shown in the figure, and for the next four minutes the compressor is operated and the temperature falls as shown. Thereafter, as shown in .about. in FIG. 4, the intermittent operation of operating and stopping the compressor at this operating ratio is repeated five times in total. In this way, since the compressor operating time is relatively long while the air flow rate is extremely low, the room temperature is initially high in dehumidification in the first region (A), but the room temperature quickly drops and the heat is reduced. It is removed and dehumidified at the same time. In this way, the indoor area at the time after the dehumidifying operation is started in the first area (A) and the above-mentioned intermittent operation of the compressor is repeated five times as shown in ~ in Fig. 4 is a new area. It is determined by the determination circuit 6. As a result of this determination, if it is determined that the area is in the fourth area (D), for example, an area determination signal indicating that the next new area is in the fourth area (D) is input to the control circuit 13. Similarly, intermittent operation (in this case, the compressor is stopped (off) for 6 minutes and the compressor is operated (on) for 3 minutes) is repeated five times according to the above table. The operating ratio in this fourth region (D) is the same as that in the first region (A).
In contrast, the operating time of the compressor is shortened by one minute, so the room temperature does not drop much and dehumidification is performed. In this way, even in the fourth region (D), 5
When the first intermittent operation of the compressor is completed, intermittent operation corresponding to the next area is performed. Note that the initial operating conditions are determined only when the dehumidification operation starts, and even if the indoor conditions change to other areas during the initial operation, intermittent operation corresponding to the area at the start of the dehumidification operation will be performed. . In addition, the timing for updating the intermittent operation conditions is when the compressor performs the fifth intermittent operation and ends the operation. Intermittent operation corresponding to the area continues. In addition, if the 7th region (G) is reached at the start of dehumidification operation, the compressor and air blower are both stopped and put on standby, and then, for example, the 4th, 5th, 6th, and 7th region (D) (E )
When moving to (F) and (H), intermittent operation of the compressor is performed in each mode without first operation. FIG. 5 is a block circuit diagram of another embodiment of the present invention, and parts corresponding to those in FIG. 2 are given the same reference numerals. FIG. 6 is a diagram for explaining the operation. In this embodiment as well, the compressor is operated intermittently for each region according to the table as in the above-mentioned embodiment, but unlike the above-mentioned embodiment, a sleep timer 17 is provided. That is, the bedtime timer 17 is set to the time shown in FIG.
When set at t ₀ ', the control circuit 13 waits for a set time (for example, 1
The room temperature at which the compressor stops is set as the temperature at which the compressor stops when the set time has elapsed, that is, at time _t1 ', and after this set time has elapsed, the room temperature must be below this set temperature or the relative humidity in the room must be at the predetermined level. If the temperature falls below this value (for example, 65%), the compressor will stop operating even if it is in intermittent operation corresponding to each of the above regions, while the room temperature will exceed this set temperature and the relative humidity in the room will be 65%. When the limit is exceeded, intermittent operation resumes. Generally, while sleeping,
The human body's ability to regulate body temperature decreases. On the other hand, as the outside temperature decreases during sleep at night, the decrease in room temperature during intermittent operation of the compressor becomes greater than during intermittent operation during the daytime even at the same operating ratio. For this reason, if the dehumidifying operation is performed while sleeping, the room temperature may drop to such an extent that the body temperature regulation function is no longer effective, causing the person to sleep cold. In order to avoid this, in this embodiment, the dehumidifying operation is performed at a room temperature above a certain level after a set time has elapsed after setting the sleep timer 17. That is, the room temperature at time t ₁ ' is set as the set temperature, and the compressor is stopped intermittently at the operating ratio corresponding to each region.
Between t ₁ ′ and t ₂ ′, t ₃ ′ and t ₄ ′, and t ₅ ′ and t ₆ ′] If the room temperature falls below the set temperature, even if it is shorter than the operating time due to intermittent operation, the compressor is stopped [at the time] t ₃ ′], and when the relative humidity in the room becomes, for example, 65% or less, the compressor is stopped [time t ₅ ′]. Next, the application of the control circuit 13 of FIG. 3 to a microcomputer will be explained with reference to the program flowchart of FIG. 7. First, when the dehumidifying operation is started, in a first step (n ₁ ) it is determined which of the first to eighth regions (A) to (H) the region is located in. This determination is made based on a determination signal from the area determination circuit 6. The result of region determination in the first step (n ₁ ) is determined as the seventh region (G) in the first determination step (n ₂ ).
It is determined whether or not. If it is determined that it is not in the seventh region (G) (NO), the dehumidification operation is started in the second step (n ₃ ) under the initial operating conditions corresponding to that determination region. Next, in the second judgment step (n ₄ ), the indoor relative humidity is determined to be a predetermined value (for example, 65
%) or less is determined. If it is determined that the temperature is not below the predetermined value (NO), it is determined in a third judgment step (n ₅ ) whether the temperature drop in the room temperature is greater than or equal to the predetermined value. If it is determined that the value is not greater than the predetermined value (NO), the fourth determination step (n ₆ ) is performed.
It is determined whether the initial operation time has been exceeded. If it is determined that the initial operation time has not been exceeded (NO), the second determination step (n ₄ )
Return to On the other hand, if it is determined as YES in any of the second, third, and fourth judgment steps (n ₄ ), (n ₅ ), and (n ₆ ),
In the third step (n ₇ ), the compressor is operated intermittently at the operating ratio determined in accordance with the region determined in the first step (n ₁ ). It is determined in the fifth determination step (n ₈ ) whether this intermittent operation has been repeated five times. As long as it is determined that the process has not been repeated five times (NO), the process returns to this fifth judgment step (n ₈ ). If it is determined that the process has been repeated five times (YES), the process proceeds to the fourth step (n ₉ ). In the fourth step (n ₉ ), the next new area is determined. Next, in a sixth determination step (n ₁₀ ), it is determined whether the area based on the new determination is the seventh area (G). If it is determined that it is not in the seventh region (G) (NO), intermittent operation of the compressor is started at the operating ratio determined corresponding to the new determination region in the fifth step (n ₁₁ ). Then, it is determined in a fifth determination step (n ₈ ) whether or not this intermittent operation has been repeated five times. Note that the first and sixth judgment steps (n ₁ )
If it is determined in step (n ₁₀ ) that it is in the seventh region (YES), the process proceeds to the sixth step (n ₁₂ ), where the compressor is stopped and enters a standby state. In addition, in the above-mentioned example, the conditions that define the regions, the number of regions, the initial operating conditions, and the operating/stopping time ratio of the compressor in intermittent operation are merely examples.
For example, the operating time of the compressor may be kept constant, and the stop time of the compressor may be gradually increased as the region progresses from the first region (A) to the seventh region (G). As explained above, according to the present invention, it is possible to dehumidify in a normal cooling cycle, that is, without using a reheater or a circuit switching valve, etc., and the manufacturing cost is comparable to that of a cooling-only type. It is possible to do so.

[Brief explanation of the drawing]

Fig. 1 is a cooling cycle diagram of an apparatus according to an embodiment of the present invention, Fig. 2 is a block circuit diagram of an embodiment of the present invention, and Fig. 3 is a region set based on indoor relative humidity and room temperature. FIG. 4 is a diagram to explain the operation of this embodiment, FIG. 5 is a block circuit diagram of another embodiment of the present invention, and FIG. 6 is a diagram to explain the operation. 7 is a program flowchart of a microcomputer when the control circuit in the embodiment of FIG. 2 is a microcomputer. FIG. 8 is a functional block diagram corresponding to the scope of the claims. 6... Area determination circuit, 10... Temperature drop detection circuit, 11... Humidity detection circuit, 12... Operation time measurement timer, 13... Control circuit, 14... Compressor operation/stop relay, 15... ...Air volume control relay, 17...Bedtime timer.

Claims (1)

[Claims] 1. In an air conditioner capable of cooling operation, a region determination circuit 6 that determines the region during dehumidification operation among a plurality of regions set based on indoor relative humidity and room temperature, and each of the region determination circuits 6 The ratio of the operating time to the stop time of the compressor 4 is individually set for each region to be large or small corresponding to the relative humidity and room temperature of each region, and corresponds to the region determined by the region determining circuit 6. An air conditioner characterized in that it has an intermittent operating means (b) for causing the compressor 4 to operate intermittently at the above ratio, and a blowing operation means (c) for causing the compressor 4 to operate at a very low air speed during intermittent operation.