JPS61252447A - Air conditioner - Google Patents

Abstract

PURPOSE:To make it possible to control the temperature of water in a predetermined water-temperature range corresponding to the circulating water flow quantity by stopping or starting the operation of a compressor by a compressor operation stopping means based on a temperature detection signal generated from two temperature detectors. CONSTITUTION:A compressor-stop water-temperature deciding operation and a inlet water temperature memory operation are carried out, and whether the detected outlet water temperature T0 of a heat exchanger 5 on the utilization side and a set water temperature TS are in a relation-ship of TO<=TS or not, is discriminated. If TO<=TS, it is decided to be the compressor stop, an output from an output circuit 22 is eliminated, and a compressor 1 and a blower 3 are stopped. After the stop of the compressor 1, by the rise in the temperature of air conditioning circulating water, the water temperature gradually rises up gradually toward a point C, and an inlet water temperature Ti2 and a stored inlet water temperature Ti1 are compared with each other. When the inlet water temperature rises up by a temperature difference preset with respect to the stored inlet water temperature Ti2, for example, more than 3.5deg deg.C, Ti2>Ti1+3.5, then it is decided to be the compressor operation, the operation returns to a step 38, and the compressor 1 and the blower 3 are operated, and thereafter the operation and stop are repeated by a flow chart.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is capable of controlling the temperature of the circulating water without causing any hindrance to the operation of the air conditioner even if the capacity of the air conditioner and the flow rate of the circulating water for air conditioning change. The present invention relates to an air conditioner that can control the temperature within a predetermined range.

[Conventional technology]

Conventionally, as a method of controlling the temperature of circulating water for air conditioning in hydraulic air conditioners, the method that is generally used is to control the temperature of the water at the inlet of the heat exchanger on the user side, as shown in Figs. It had become a thing. In the figure, (1) is the compressor, (2
) is a non-use side heat exchanger for condensing refrigerant gas, (3)
is a blower that sends air to the heat exchanger on the non-use side, (4) is a throttling device that reduces the pressure of the liquid refrigerant, (5) is used for circulation between an air conditioning load device (7) such as a fan coil unit, etc. The user-side heat exchanger for exchanging heat between the circulating water for air conditioning and the refrigerant supplied from the compressor (1) constitutes a well-known refrigeration psyche μ, and (5a) and (6b) are The water inlet part and the water outlet part of the side heat exchanger (5), - is the water inlet part (5).
Temperature controller installed in section a), (7) is a fan coil unit connected to the heat exchanger (5) on the user side via air conditioning circulating water piping (8), - detects an abnormality in the compressor (1) The contacts of the abnormality detector, ■ is the operation switch, Akatsuki is the stop switch, and is a self-holding relay! The contact point (68a) of the self-holding relay is connected in parallel with the operation switch Ill. The other contact (68b) is connected in series with the temperature controller contact (64a) and the operating electromagnetic switch Coil/L/IIl of the compressor (1).

Next, the operation will be explained. First, after turning on the power, when the operation switch part υ is turned on, the self-holding relay coil/L'13 is energized through the stop switch, and the contact (68a)
and (68b) are closed, the operation switch 1 is short-circuited by the contact (68a), the self-holding relay coil is self-holding, and the contact (68b) is connected to the compressor operating switch through the temperature controller contact (64a). Electromagnetic switch carp μ
- is energized, and the compressor (1) and the blower (3) start operating in conjunction with the compressor (1). The refrigerant gas discharged from the compressor (1) is cooled in the non-use side heat exchanger (2) by the blower (3) and becomes liquid refrigerant, and the pressure is reduced in the expansion device (4) and transferred to the use side heat exchanger ( At step 5), the refrigerant exchanges heat with the air-conditioning circulating water flowing in from the water inlet (5a), absorbs heat, evaporates, and returns to the compressor (1). In addition, the circulating water for air conditioning that has exchanged heat with the refrigerant is deprived of heat and becomes cold water, and the water exit part (5b)
The water enters the fan coil unit (7) and cools the indoor air, and the water whose temperature has risen flows again into the user-side heat exchanger (5) and is cooled. Air conditioning is performed by repeating the above refrigerant and water psyche μ, and when the cooling load on the fan coil unit (7) decreases, the temperature of the air conditioning circulating water decreases because the amount of heat extracted from the indoor air decreases. When the temperature decreases and reaches the set temperature of the temperature controller -, the contact (64a) opens and the electromagnetic switch coil /L/- is deenergized, so the operation of the compressor (1) is stopped. , the system will wait for the temperature of the circulating water for air conditioning to rise. After that, the user-side heat exchanger (5) is equipped with a temperature sensing part of a temperature controller.
When the inlet temperature of the water inlet (5a) increases and reaches the return temperature of the temperature controller, the contact (64a) closes, the electromagnetic switch coil/L'11 is energized, and the compressor is turned on again. (
1) starts operation and begins cooling.

[Problem that the invention seeks to solve]

As mentioned above, in conventional air conditioners, the operation of the compressor was controlled by the inlet water temperature of the heat exchanger on the user side, so if there was a change in the capacity of the air conditioner, the outlet water temperature would change even if the inlet water temperature was constant. Because of this fluctuation, the fluctuation range of the outlet water temperature becomes large. In addition, it also fluctuates due to changes in the flow rate of circulating water for air conditioning, so if the circulating water flow rate decreases due to a decrease in pump capacity or clogged piping, the outlet water temperature will drop more than necessary, and in the worst case. There were problems such as the risk of water freezing inside the heat exchanger on the user side.

This invention was made to solve the above problems, and even if the capacity of the air conditioner or the flow rate of circulating water for air conditioning changes, the water temperature remains within a certain range according to the flow rate of the circulating water. The purpose of this invention is to obtain an air conditioner that can control water temperature.

[Means for solving problems]

The air conditioner according to the present invention includes a refrigerant compressor that sucks in refrigerant, compresses it and discharges it, a non-use side heat exchanger that exchanges heat between the refrigerant supplied from the compressor and a fluid to be heat exchanged, and the compressor. A user-side heat exchanger that exchanges heat between the refrigerant supplied by the machine and air-conditioning circulating water that is circulated between the air conditioning load device such as a fan coil unit, and the temperature of the outlet water of this user-side heat exchanger are detected. , a first temperature detector that generates an output signal according to the outlet water temperature, and a second temperature detector that detects the inlet water temperature of the user-side heat exchanger and generates an output signal according to the inlet water temperature. a temperature detector; a compressor stop water temperature determining means for generating an output signal when the temperature detection signal generated from the first temperature detector reaches a signal level corresponding to a preset temperature; and the compressor. an inlet water temperature storage means for storing a temperature detection signal generated from the second temperature detector when the output signal generated from the stop water temperature determination means is supplied; and a temperature detection signal generated from the second temperature detector. and inlet water temperature change amount determining means for generating an output signal when a signal level difference between the temperature detection signal and the temperature detection signal stored in the inlet water temperature storage means reaches a signal level difference corresponding to a preset temperature difference; Compressor operation stop means for stopping the compressor based on the output signal generated from the compressor stop water temperature determining means and starting the compressor based on the output signal generated from the inlet water temperature change amount determining means. The above object is achieved by configuring an air conditioner by providing the air conditioner.

[Effect]

In this invention, when the temperature detection signal generated from the first temperature detector reaches a signal level corresponding to a preset temperature, the compressor operation is stopped based on the output signal generated from the compressor stop water temperature determination means. Means stop operation of the compressor. On the other hand, when the output signal generated from the compressor stop water temperature determination means is supplied, the temperature detection signal generated from the second temperature detector at that time is stored, and this stored temperature detection signal and the When the signal level difference with the temperature detection signal generated from the temperature sensor No. 2 reaches a signal level difference corresponding to a preset temperature difference, the compression The machine operation stop means acts to start the compressor.

〔Example〕

FIG. 1 is an overall configuration diagram of an air conditioner showing an embodiment of the present invention. The refrigeration cycle side of this embodiment is the same as that of the conventional embodiment, but as is clear from the figure, one control part is configured as follows. (9) is a second temperature detector, αG, which is installed at the water inlet part (5a) of the user-side heat exchanger (5), detects the concentration of the inlet water, and generates an output signal according to the concentration of the inlet water. (b) a first temperature detector installed at the water outlet section (5b) of the user-side heat exchanger (5) to detect the outlet water temperature and generate an output signal according to the outlet water temperature; is a compressor stop water temperature determination means, and the first
When the temperature detection signal generated from the temperature detector QO reaches a signal level corresponding to a preset temperature, an output signal is generated. (2) stores the temperature detection signal generated from the second temperature sensor (5a) when the output signal generated from the compressor stop water temperature -'I'll determination means east is supplied; inlet water temperature storage means;
α4 is a signal whose signal level difference between the temperature detection signal generated from the second temperature detector (9) and the temperature detection signal stored in the inlet water temperature storage means υ corresponds to a preset temperature difference. It is an inlet water temperature change amount determining means that generates an output signal when a level difference is reached. 03 stops the compressor (1) based on the output signal generated from the compressor stop water temperature determining means αυ, and starts the compressor (1) based on the output signal generated from the inlet water temperature change amount determining means. This is means for stopping compressor operation.

FIG. 2 is a circuit diagram showing electrical connections of the air conditioner shown in FIG. 1. In the figure, (to) is a microcomputer in the control device aη, CPUQl, and memory (a).

Input circuit @ - output circuit) @ a! 3t
(c) is each temperature sensor (9), resistor 1 in series with QO
(2) is an A/D converter to which the detection output of each temperature sensor (9) is input and converts it into digital /L/, and the output is given to the input circuit (2). @ is the operation switch (
Resistor 1 (2) in series with (b) is the protector of the compressor (1) -
and the status signals of the operating switch and protection device are also applied to the input circuit. Compressor operation/stop means (to) is an electromagnetic switch for the compressor (as shown)
Auxiliary relay e1 and contact (81a) that outputs a signal to
, and a terminal (to), and the transistor (to) has a resistor (
(to) to the output circuit (2).

Next, the operation of the above embodiment will be explained with reference to FIGS. 8 and 4. FIG. 8 is a flowchart showing the air conditioner program stored in the memory of the microcomputer, and FIG. 4 is an operating characteristic diagram of the air conditioner according to the present invention.

First, when the operation switch is closed, the ON signal is input to the input circuit (), step - shown in FIG. This judgment is made by opening the operation switch →
This is only done when you start driving with the switch closed.
The compressor (1 temperature) is detected by the first temperature detector αG.
) is set to 6℃, for example, and if the inlet water concentration is higher than the set temperature by 8℃ or more, a judgment of "YE8J" is made. The temperature of the water is determined by the heat exchanger (5) on the user side.
Based on the zero-order determined result, which is detected by the second temperature detector (9) using the inlet water concentration of , If the judgment is "NOJ", the judgment is made again and the judgment is repeated until the judgment becomes "YE8J."
When it reaches 8J, the process advances to step (goods), output is output from the output circuit, the transistor is turned on, the auxiliary relay 0η is energized, the contact (81a) is closed, and the electromagnetic switch for the compressor (as shown in the figure) is connected from the terminal (to). ), a signal is output to the compressor (1)
The blower (3) linked to the compressor (1) starts operating, and the outlet water temperature begins to decrease as shown by the fourth internal point.

Next, in step 3, it is determined whether or not there is an abnormality in the compressor (1).If it is determined that there is an abnormality, the process proceeds to step 4, where the output from the output circuit (support) disappears and the auxiliary relay 0η is deenergized and the compressor (1) and blower (3) are stopped. To determine the presence or absence of an abnormality, the signal from the abnormality detector is input to the input circuit (2), and the CPU (2) performs 0. Then, in steps 1 to 2, the compressor stop water temperature is determined and the inlet water temperature is memorized. The operation is performed, and the detected outlet water temperature TO and the set water temperature Ts are TO≦
It is determined whether or not TS is reached, and if To≦Ts, the process returns to step kan and repeats step @S. (1) continues to operate and lowers the temperature of the air conditioning circulating water. After a certain time, if To≦Ts, it is determined that the compressor has stopped, and the output from the 1-output circuit (2) disappears, and as a result, the compressor (1) and the blower (3) stop. Also, immediately after the compressor stops, the microcomputer (to)
The inlet water temperature TI is stored in the memory of the system, and the system then waits for the temperature of the air conditioning circulating water to rise. Point B in Figure 4 is the point where the compressor (1) has stopped, and the 1st outlet water temperature is the set water temperature (6
Regarding the zero-order step circle, which stopped due to K reaching ℃), after the compressor (1) stops at point B in Figure 4, it gradually moves toward the zero point due to the temperature rise of the air conditioning circulating water. When the water temperature rises, the inlet water temperature Ti2 and the stored inlet water temperature Ti1 are compared, and the artificial water temperature T12 is found to have a preset temperature difference, for example, 3.5 with respect to the stored inlet water temperature Ti1.
deg “If it increases by 0 or more, Ti2>Ti1+3.5
Then, it is determined that the compressor is in operation, and the step returns to step 3 to operate the compressor (1) and blower (3), and thereafter the operation and stop are repeated according to the above flowchart.

Point C in FIG. 4 is the point at which the compressor starts operating again, and as the outlet water temperature decreases, the inlet water temperature decreases, and at point D, the outlet water temperature reaches the set water temperature and the compressor (1) stops. This operation is repeated until the function as an air conditioner is satisfied.

In addition, although the above embodiment describes the case of an air-cooled cooling-only air conditioner, the same applies to a water-cooled type.
In addition, in a heat pump type air conditioner, the same effect as in the first embodiment can be obtained by reversing the set water temperature and the direction of change of the water temperature not only during cooling but also during heating.

〔Effect of the invention〕

As described above, according to the present invention, there is provided a refrigerant compressor that takes in refrigerant, compresses it and discharges it, a non-use side heat exchanger that exchanges heat between the refrigerant supplied from the compressor and the fluid to be heat exchanged, and the compressor. A user-side heat exchanger exchanges heat between the refrigerant supplied from the machine and the air-conditioning circulating water that is circulated between the air conditioning load device such as the Fancoi μ unit, and the temperature of the outlet water of this user-side heat exchanger is detected. , a first temperature detector that generates an output signal according to the outlet water temperature, and a second temperature detector that detects the inlet water concentration of the user-side heat exchanger and generates an output signal according to the inlet water concentration. a temperature detector; a compressor stop water temperature determining means for generating an output signal when the temperature detection signal generated from the first temperature detector reaches a signal level corresponding to a preset temperature; and the compressor. an inlet water temperature storage means for storing a temperature detection signal generated from the second temperature detector when the output signal generated from the stop water temperature determination means is supplied; and a temperature detection signal generated from the second temperature detector. and inlet water temperature change amount determining means for generating an output signal when a signal level difference between the temperature detection signal and the temperature detection signal stored in the inlet water temperature storage means reaches a signal level difference corresponding to a preset temperature difference; Compressor operation stop means is provided for stopping the compressor based on an output signal generated from the compressor stop water temperature determining means and starting the compressor based on an output signal generated from the inlet water temperature change amount determining means. For example, since the air conditioner was constructed by
Even if the flow rate of circulating water for air conditioning changes due to a decrease in circulation pump capacity or clogged piping, the outlet water temperature of the user-side heat exchanger can be controlled within the specified temperature range, and the temperature inside the user-side heat exchanger We were able to eliminate the fear of freezing. Furthermore, even when the capacity of the air conditioner changes, it is possible to solve the problem of the outlet water temperature fluctuating significantly as in conventional devices.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of an air conditioner showing an embodiment of the present invention, FIG. 2 is a circuit diagram showing electrical connections of the air conditioner shown in FIG. 1, and FIG. 8 is a flow chart showing its operation. FIG. 4 is an operating characteristic diagram of the air conditioner shown in FIG. 1, FIG. 5 is a block diagram of a conventional air conditioner, and FIG. 6 is an electric circuit diagram of its control section. In the figure, (1) is the compressor, (2) is the non-use side heat exchanger 1 (7) is the air conditioning load equipment such as the Huffian coil unit, etc.
, (5) is the utilization side heat exchanger, (9) is the second temperature detector, α1 is the first temperature detector, (b) is the compressor stop water temperature determination means 1 (2) is the inlet water temperature storage means , (2) is compressor operation/stop means, and α4 is inlet water temperature change amount determination means.
Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] A refrigerant compressor that sucks in refrigerant and compresses and discharges it, a non-use side heat exchanger that exchanges heat between the refrigerant supplied from this compressor and the fluid to be heat exchanged, and a fan coil unit that exchanges heat between the refrigerant supplied from the compressor and the fan coil unit. A user-side heat exchanger that exchanges heat with the air-conditioning circulating water that is circulated between the air conditioning load equipment, detects the outlet water temperature of this user-side heat exchanger, and generates an output signal according to this outlet water temperature. a first temperature detector that detects the inlet water temperature of the user-side heat exchanger and generates an output signal according to the inlet water temperature; Compressor stop water temperature determining means for generating an output signal when the temperature detection signal reaches a signal level corresponding to a preset temperature; when the output signal generated from the compressor stop water temperature determining means is supplied; An inlet water temperature storage means for storing a temperature detection signal generated from the second temperature detector, and a combination of the temperature detection signal generated from the second temperature sensor and the temperature detection signal stored in the inlet water temperature storage means. When the signal level difference reaches a signal level difference corresponding to a preset temperature difference, the compression is performed based on the output signal generated from the inlet water temperature change amount determination means that generates an output signal and the compressor stop water temperature determination means. An air conditioner comprising compressor operation stop means for stopping the compressor and starting the compressor based on an output signal generated from the inlet water temperature change amount determining means.