JPS5934830Y2 - air conditioner - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an air conditioner that is capable of controlling the room temperature by changing the force and controlling the temperature in response to load fluctuations.

In an air conditioner with a stepwise capacity control function, the temperature controller 12, which has been conventionally used to control the refrigerating capacity, is preferentially installed in the case of a general two-step capacity control type air conditioner. The operating range of the first contact point 13 for controlling the on/off of the first compression system A and the second contact 14 for controlling the on/off of the second compression system port is as shown in FIG. There is a temperature difference between them.

When temperature control is performed using a device with such operating characteristics, as shown in an example of operation in Figure 3, when the cooling load is large, in addition to energizing the first compression system A by closing the first contact 13, The second compression system port starts and stops within the operating range TH2 to TL2 of the second contact 14, while when the cooling load is small, the first
Since the first compression system A is turned on and off within the operating range THI to TLI of the contact 13, the room temperature moves between the two operating ranges with a step-to-step temperature difference due to such a wide variation in load. Therefore, the temperature is not constant and the phenomenon of overcooling occurs.

In addition, in the case of heating operation, the phenomenon of overheating naturally occurs.

As a result, the air conditioner consumes more power than necessary, resulting in uneconomical operation, which has the disadvantage of not being suitable for the current situation where energy conservation is strongly desired.In addition, the room temperature remains constant due to load fluctuations. There was a problem of lack of comfort because of the lack of comfort.

However, in order to eliminate such defects, the temperature difference between the steps as described above should be made as narrow as possible.
This poses a problem in which the compression system and the second compression system are frequently turned on and off, and a disturbance phenomenon due to the hunting operation occurs, which is undesirable in practice, and therefore it is difficult to say that this is an appropriate countermeasure.

In view of these facts, the present invention has been developed to provide a new air conditioner that can eliminate the above-mentioned conventional defects and achieve comfortable air conditioning. In an air conditioner that has a stepwise capacity control function that can energize the first compression system and the second compression system individually or all at once, a series resistor consisting of a temperature sensing element for temperature detection and a correction resistor and a variable resistor for temperature setting are used. and a differential exists between on/off of the output signal, and the potential of the temperature sensing temperature sensing element and the potential of the temperature setting variable resistor are given as input signals. and a differential larger than the first comparison circuit exists between on and off of the output signal, and the potential of the series resistor and the potential of the temperature setting variable resistor are input. When the output signal of the second comparator circuit and the first comparator circuit given as a signal is on, the on signal is compressed, and when the output signal is off, the on/off signal corresponding to the on/off output of the second comparator circuit is compressed by the first compression circuit. an arithmetic circuit that provides an off signal to the second compression system when the output signal of the second comparison circuit is off, and an on/off signal corresponding to the on/off output of the first comparison circuit when it is on; By configuring the temperature control system, the step temperature difference in the temperature control system is eliminated, and when the room temperature goes out of the temperature setting range with a differential, the output signal for the next step is issued, and the temperature is always kept within a constant set temperature. The desired purpose is achieved by controlling the room temperature.

Hereinafter, one embodiment of the present invention will be described in detail based on the accompanying drawings.

The air conditioner according to the present invention, such as an air conditioner, uses a compression refrigeration cycle to cool the indoor atmosphere, and includes:
The compressor has two systems, a first compression system and a second compression system, and at least one of the first compression system and the second compression system can be energized individually or all at once. According to
N capacity control operation can be performed.

However, an example of a compressor consisting of a first compression system and a second compression system is one that has two cylinders, one of which is the first compression system, and the other is the second compression system equipped with an unloading device. A two-speed type electric motor is used, and the first compression system is used when the low speed side is energized, and the second compression system is used when the high speed side is energized. Any method that uses two units in parallel is applicable.

The basic circuit of the temperature control system for controlling the first compression system A and the second compression system port is illustrated in FIGS. It consists of a bridge circuit 1, a first comparison circuit 2, a second comparison circuit 3, and an arithmetic circuit 4 as constituent elements.

The bridge circuit 1 has a series resistor R consisting of a temperature sensing element 5 for temperature detection and a correction resistor 6, and a variable resistor γ for temperature setting as opposite sides, and adjustment resistors 8 and 9 connected in series with them, respectively.
, the potential E2 of the series resistor R,
The potential E0 of the temperature sensing element 5 is taken out as a comparison signal with the potential E3 of the temperature setting variable resistor T.

As the temperature sensing element 5, for example, a thermistor having a positive resistance-temperature characteristic is used, and it is arranged at an appropriate position so as to detect the temperature of the indoor air introduced from the intake grill of the air conditioner.

1st. The second comparison circuits 2 and 3 use comparators, and the first comparison circuit 2 has a feedback resistance Y larger than a feedback resistance X of the second comparison circuit 3, so that the on-operation point THH and the off-operation The difference between the point TLL, that is, the differential, is determined by the second comparison circuit 30 between the on operating point TH and the off operating point TL.
This makes the difference larger than the difference between the two.

The first comparison circuit 2 applies the potential E1 of the thermistor 50 to the input terminal and the potential E3 of the temperature setting variable resistor T to the O input terminal, while the second comparison circuit 3 applies the potential E1 of the thermistor 50 to the input terminal. The potential E2 of the series resistor R is applied to the O input terminal, and the potential E3 is applied to the O input terminal.

By combining the bridge circuit 1 and both comparison circuits 2 and 3 in this way, the relationship of potential E2>potential E1 is always maintained, so that when the room temperature reaches the upper limit value TH of the set temperature, the 2. An on signal is output from the comparison circuit 3, and the on signal is held until the room temperature falls below the lower limit value TL of the set temperature, while the room temperature reaches a value THH exceeding the upper limit value TH. At times, the first comparator circuit 2 outputs an on signal, and the on signal is held until the room temperature reaches a value TLL below the lower limit value TL.

Next, as shown in FIG. 5, the arithmetic circuit 4 consists of an OR circuit and an AND circuit, which are a NOR circuit and a NOT circuit connected in series, as shown in logical symbols. The output signals A and B of the two comparison circuits 3 are applied to the NOR circuit and the AND circuit as input signals, respectively, while the output signal 10 of the OR circuit is applied to the first compression system A and the AN
The output signal 11 of the D circuit is applied to each of the second compression system ports as a command signal.

As is clear from its circuit structure, the arithmetic circuit 4 sends the following control commands to the first compression system.

Apply to the second compression system port.

(I) The output signal A of the first comparator circuit 2 is on (logic l
), the first compression system A is always activated, and conversely, when the output signal A is off (logic O), the first compression system A is activated in response to the on/off of the output signal of the second comparator circuit 3. Become or lose power.

That is, the first compression system A is deenergized only when the output signal A is off and the output signal B is off.

(b) When the output signal A of the first comparator circuit 2 is off (logic O), the second compression system port is always deenergized;
When is on (logic 1), the second compression system port is energized or deenergized in response to the on/off of the output signal of the second comparator circuit 3.

In other words, the second compression system port is energized only when the output signal A is on and the output signal B is on.

The operating mode of the air conditioner of the present invention having the above configuration will be explained with reference to FIGS. 4 to 7. By setting the temperature setting variable resistor 7 to m, the temperature setting range is T)r" in FIG.
The second comparison circuit 3 outputs an on output signal at TH and an off output signal at TL.

Also, the on output signal from the first comparator circuit 2 is THH.
An off output signal is output at LL.

Due to this operating mode, when the room temperature is higher than THH and the load is high, both compression systems A are energized to perform cooling with sufficient capacity, and when the room temperature drops to TL, the first compression system A is energized. Deenergize the second compression system port with N, then TL-
Start/stop control is performed only by the second compression system port within the +TH setting range.

On the other hand, when the room temperature drops below TL under low load conditions, when the room temperature drops to TLL, both compression system ports are de-energized, and then as the room temperature rises, the first compression system starts and stops. Then, cooling operation is performed to keep the room temperature within the general constant range TL-+T.

In this way, although the temperature controller is a two-step command system, the step temperature difference is zero, and one compression system that was previously forced to stop when the room temperature deviates from the temperature setting range is controlled to start and stop, and the room temperature is always kept constant. This makes it possible to maintain the temperature within a set temperature range.

As is clear from the details described above, in the present invention, the first comparison circuit 2 operates as a temperature setting mechanism for suppressing the temperature of the air-conditioned area between the upper limit and the lower limit, while the second comparison circuit 3 operates as a load determination mechanism to determine whether it is a high load state or a low load state, and controls the start/stop of either the first compression system or the second compression system, or controls the start/stop of both compression systems together. Since the room temperature is always stabilized within the set temperature range, changes in the temperature of the air-conditioned area are small in response to load fluctuations, and as a result, not only can comfortable air conditioning be achieved, The uneconomical effects of excessive electricity consumption due to excessive cooling or heating will be eliminated.

Furthermore, the present invention has the advantage of being highly practical, as it allows stable operation without causing the hunting phenomenon even when the upper and lower limits of the set temperature range are close to each other. However, it is a huge air conditioner.

[Brief explanation of the drawing]

FIG. 1, FIG. 2, and FIG. 3 are a compressor operation circuit diagram, a contact operation mode diagram of a temperature regulator, and an air conditioning operation time chart in a conventional air conditioner. Figures 4 to 7 show aspects of the air conditioner of the present invention. Figure 4 is a developed diagram of the bridge circuit and comparison circuit of the temperature control system, Figure 5 is a logic diagram of the arithmetic circuit, and Figure 6 is a logic diagram of the arithmetic circuit. The figure is a diagram of the output signal operation mode of the temperature control system, and FIG. 7 is a time chart of air conditioning operation. 1... Bridge circuit, 2... First comparison circuit, 3... Second comparison circuit, 4... Arithmetic circuit, 5......・Temperature sensing element for temperature detection, 6...
...Correction resistor, 7...Variable resistance for temperature setting,
A...First compression system, Mouth...Second compression system, R...Series resistor

Claims (1)

[Scope of utility model registration request] An air conditioner having a stepwise capacity control function that can energize a first compression system and a second compression system inlet individually or all at once. A bridge circuit 1 includes a resistor R and a temperature setting variable resistor 7 as opposing sides, and a differential exists between on/off of an output signal, and a differential exists between the potential of the temperature sensing element 5 and the temperature setting. A first comparator circuit 2 to which the potential of the variable resistor T is applied as an input signal, and a differential larger than that of the first comparator circuit 2 exists between on and off of the output signal, and the series resistor A second comparator circuit 3 receives the potential of R and the potential of the temperature setting variable resistor 7 as input signals, and outputs an on signal when the output signal of the first comparator circuit 2 is on, and a second comparator circuit when the output signal of the first comparator circuit 2 is on. The on/off signal corresponding to the on/off output of No. 3 is transmitted to the first
On the other hand, when the output signal of the second comparison circuit 3 is off, an off signal is sent to the compression system A, and when it is on, an on/off signal corresponding to the on/off output of the first comparison circuit 20 is sent to the second comparison circuit 3.
An air conditioner characterized in that a temperature control system is constituted by an arithmetic circuit 4 applied to a compression system port.