KR20020041241A - Controller and method for defrosting operation of air-conditioner used both cooler and heater using electronic valve - Google Patents

Abstract

PURPOSE: A device and method for controlling defrosting operation of reverse air conditioner using solenoid valve are provided to efficiently control flow of refrigerant and to remove frost formed on an outdoor heat exchanger without stopping heating cycle during heating. CONSTITUTION: A device includes a solenoid valve(200); and an outdoor temperature sensor(130). The solenoid valve has a stepping motor, driven by current signal, used therein and is installed on a refrigerant pipe branched from a point between a capillary(140) and an outdoor heat exchanger(120) and which returns to a point between a compressor(100) and a four-way valve(110). The outdoor temperature sensor is installed on the outdoor heat exchanger to detect outdoor temperature.

Description

Controller and method for defrosting operation of air-conditioner used both cooler and heater using electronic valve}

The present invention relates to a defrosting operation control device and control method for a combined air conditioning and air conditioning, and more particularly, by controlling the refrigerant flow rate by the linear opening and closing change using the solenoid valve, the outdoor heat exchange without interrupting the heating cycle during heating operation The present invention relates to a defrosting operation control apparatus and control method for a combined air conditioning and air conditioner using a solenoid valve capable of eliminating frost on the machine.

In general, the air conditioner uses the phenomenon of absorbing the surrounding heat when the liquid evaporates, and performs cooling as well as dehumidification. By the way, in the case of air-conditioning combined air-conditioning and cooling and heating, the circulation path of the refrigerant is reversed so that the heat is absorbed and released into the room during the heating operation, and the heat is absorbed and released into the outdoor during the cooling operation. .

As the frost is formed on the outdoor heat exchanger coil during the evaporation process of absorbing the surrounding heat in the outdoor heat exchanger during the heating operation of the combined air-conditioning and air conditioning, the defrosting operation is performed to remove the frost.

1 is a refrigerant circulation diagram of a general air-conditioning combined air conditioner.

As shown here, the compressor 10 converts the refrigerant into a high-temperature / high-pressure gas refrigerant, and converts the high-temperature / high-pressure gas refrigerant of the compressor 10 into a high pressure and liquid state through heat exchange with ambient air. The outdoor heat exchanger (30), the high-pressure, liquid refrigerant of the outdoor heat exchanger (30) is expanded, the capillary tube (40) which is converted into a low-temperature, low-pressure fog state refrigerant, and the refrigerant passing through the capillary tube (40) The filter 50 to filter, the indoor heat exchanger 70 in which the low-temperature, low-pressure fog state of the filter 50 is converted into a gas state, and the refrigerant of the indoor heat exchanger 70 are returned to the compressor 10. It consists of an accumulator 90 for supplying.

Here, reference numeral 60 denotes a liquid valve, and 80 denotes a gas valve.

Looking at the coolant net environmental path of the air-conditioning combined air conditioning as described above are as follows.

First, during the cooling operation, that is, as shown by the solid arrow, the refrigerant compressed by the compressor 10 is routed from the four sides 20 to the outdoor heat exchanger 30, so that the refrigerant flows to the outdoor heat exchanger 30. After releasing the heat contained in the heat exchanged refrigerant is converted into a low-temperature, low-pressure fog refrigerant by expanding the high-pressure, liquid refrigerant by the pressure drop action through the capillary tube 40 and the filter 50, When the observation valve 60 is opened, it is sent to the indoor heat exchanger (70). The refrigerant sent to the indoor heat exchanger (70) absorbs the heat from the outside and is converted into the gas state from the refrigerant in the mist state, and when the gas valve (80) is opened, the accumulator (90) passes through the four sides (20). It is sent back to the compressor 10 through the circulation.

At this time, the indoor heat exchanger 70 installed in the room absorbs the surrounding heat, thereby cooling the room.

Next, during the heating operation, as the refrigerant compressed by the compressor 10 is routed from the four sides 20 to the indoor heat exchanger 70 as shown by the dotted arrow, the gas-side valve 80 is opened. If the flow rate is passed to the indoor heat exchanger 70 to release the heat contained in the heat exchanged refrigerant is sent to the filter 50 and capillary tube 40 when the liquid valve side valve 60 is opened, and again the outdoor heat exchanger (30) After the heat exchange is made to absorb the heat around the evaporation from the liquid state to the gaseous state is made through the four sides (20) and then sent back to the compressor (10) through the accumulator 90 is circulated.

At this time, since the heat contained in the refrigerant is released from the indoor heat exchanger 30 installed in the room, the room is heated.

In the heating operation of the combined air-conditioning and air conditioning made as described above, the defrosting operation is performed to remove the frost on the coil of the outdoor heat exchanger 30 during the evaporation process of absorbing ambient heat from the outdoor heat exchanger 30.

The conventional air-conditioning combined air conditioner stops the heating operation during the defrosting operation and performs the defrosting operation by changing the mode to the cooling operation. Therefore, the indoor heat exchanger reduces the room temperature by 5 ° C. to 6 ° C., and from heating to cooling to cooling. When the function is switched to heating, the four-sided switch is appropriately switched to the cooling or heating function, so the four-sided switching noise is generated, and the life of the four-sided side has a problem of shortening.

Therefore, in order to solve this problem, by branching from the refrigerant pipe between the capillary tube and the outdoor heat exchanger, an anisotropic valve (not shown) is installed and connected between the compressor and the quadrilateral valve, thereby maintaining the heating cycle. When the measured temperature drops below a specific temperature by a temperature sensor (not shown) mounted on the outlet side of the air, the hot / high pressure refrigerant gas flowing to the indoor heat exchanger discharged from the compressor by opening the anisotropic valve (not shown) By sending a part of the to the indoor heat exchanger and mixed with the refrigerant decompressed through the expansion process of the capillary tube, a non-stop defrosting apparatus for removing the frost formed by raising the surface temperature of the outdoor heat exchanger.

However, in the case of the nonstop defrosting operation using the conventional anisotropic valve (not shown) as described above, the compressor is not turned ON / OFF compared to the defrosting operation through the ON / OFF of the four sides and the compressor, and the heating cycle is Since the power consumption is wasted because it is maintained, it is effective for realizing continuous heating operation, but it is performed through an anisotropic valve (not shown) which is unable to control the refrigerant flow rate. As the low pressure liquid refrigerant is mixed, the rapid pressure imbalance causes the noise of the outdoor unit to increase.

In addition, since the time point at which the anisotropic valve (not shown) is opened and closed is set to only two temperature variables, efficient defrosting is difficult to be realized, and condensation heat exchange of the indoor heat exchanger is caused by excessive refrigerant flow rate through the anisotropic valve (not shown). The amount is also reduced to increase the amount of heating capacity decrease during defrosting operation.

The present invention has been made to solve the above problems, an object of the present invention is to provide a coolant flow efficiently by linearly changing the opening and closing with a solenoid valve using a stepping motor driven by receiving a current signal instead of an anisotropy. The present invention provides a defrosting operation control device and a control operation method of a combined air conditioning and air conditioner using a solenoid valve capable of controlling and removing frost formed on an outdoor heat exchanger without interrupting a heating cycle during a heating operation.

1 is a refrigerant circulation diagram of a general air-conditioning combined air conditioner.

2 is a refrigerant circulation diagram of a combined air conditioning and air conditioner using the solenoid valve according to the present invention.

3 is a flowchart illustrating a method of controlling a defrosting operation of a combined air conditioning and air conditioner using the solenoid valve according to the present invention.

Explanation of symbols on the main parts of the drawings

100: compressor 110: four sides

120: outdoor heat exchanger 130: outdoor temperature sensor

140: capillary 150: filter

160: liquid side valve 170: indoor heat exchanger

180 gas monitoring valve 190 accumulator

200: solenoid valve

In order to achieve the above object, the present invention includes a compressor, an indoor heat exchanger, a filter, a capillary tube, an outdoor heat exchanger, and an accumulator. In the air-conditioning combined air conditioner configured to be returned to the compressor, provided with a solenoid valve using a stepping motor driven by receiving a current signal branched from the refrigerant pipe between the capillary tube and the outdoor heat exchanger between the compressor and the four sides. It is characterized in that connected to.

In addition, the outdoor heat exchanger is equipped with an outdoor temperature sensor for sensing the outdoor temperature, characterized in that to perform an efficient defrosting operation by adjusting the solenoid valve by the outdoor temperature detected by the outdoor temperature sensor.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a refrigerant circulation diagram of a combined air conditioning and air conditioner using the solenoid valve according to the present invention.

Referring to Figure 2, the configuration of the air-conditioning air conditioner according to the present invention, the compressor 100 to compress the refrigerant to a high-temperature, high-pressure gas refrigerant and the high-temperature, high-pressure gas refrigerant of the compressor 100 and the surrounding air The outdoor heat exchanger 120 is converted into a high pressure and a liquid state through heat exchange of the capillary tube 140 which is converted into a refrigerant having a low temperature and low pressure while the high pressure and liquid refrigerant are expanded in the outdoor heat exchanger 120. And a filter 150 for filtering the refrigerant passing through the capillary tube 140, an indoor heat exchanger 170 for converting the low-temperature, low-pressure fog state of the filter 150 into a gas state, and an indoor heat exchanger ( It consists of an accumulator 190 for supplying the refrigerant of the 170 back to the compressor (100).

In addition, branched from the refrigerant pipe between the capillary tube 140 and the outdoor heat exchanger 120 is provided with a solenoid valve 200 is connected between the compressor 100 and the four sides 110.

Here, reference numeral 160 denotes a liquid valve, and 180 denotes a gas valve.

In addition, an outdoor temperature sensor 130 for detecting an outdoor temperature is attached to the outlet side of the outdoor heat exchanger 120.

Refrigerant flow of the air conditioning air conditioning configured as described above is as follows.

First, during the cooling operation, that is, as shown by the solid arrow, the refrigerant compressed by the compressor 100 flows from the four sides 110 to the outdoor heat exchanger 120, thereby setting the path to the outdoor heat exchanger 120. After releasing the heat contained therein, the heat-exchanged refrigerant is converted into a low-temperature, low-pressure fog refrigerant by expanding the high-pressure and liquid refrigerant by a pressure drop action through the capillary tube 140 and the filter 150. When the observation valve 160 is opened, it is sent to the indoor heat exchanger (170). The refrigerant sent to the indoor heat exchanger 170 absorbs the heat from the outside and is converted into a gas state from the refrigerant in the mist state, and when the gas valve valve 180 is opened, the refrigerant passes through the four sides 110 and then accumulates the accumulator 190. It is sent back to the compressor 100 through the circulation.

At this time, the indoor heat exchanger 170 installed in the room absorbs the surrounding heat, thereby cooling the room.

Next, during the heating operation, as the refrigerant compressed by the compressor 100 is set as a path to flow from the four sides 110 to the indoor heat exchanger 170 as shown by a dotted arrow, the gas-side valve 180 is opened. If the flow to the indoor heat exchanger 170 to release the heat contained in the heat exchanged refrigerant is sent to the filter 150 and the capillary tube 140 when the liquid valve side valve 160 is opened, the outdoor heat exchanger 120 After the heat exchange is evaporated from the liquid state to the gaseous state to absorb the heat of the surrounding is made through the four sides 110 through the accumulator 190 is sent back to the compressor 100 to circulate.

At this time, since the heat contained in the refrigerant is released from the indoor heat exchanger (170) installed indoors to heat the room.

In addition, when determining the entry point of the defrosting operation to remove the frost formed on the coil when the outdoor heat exchanger absorbs ambient heat during the heating operation, the temperature sensor compares whether the outdoor heat exchanger coil temperature is below freezing point. If the detected outdoor temperature is below the freezing point, the current signal pulse is increased step by step to the stepping motor to open the solenoid valve step by step to send only a proper amount of the high / high pressure refrigerant gas discharged from the compressor to the outdoor heat exchanger. Efficient defrosting operation to remove frost on the heat exchanger coil is performed, and heating operation is also performed smoothly.

3 is a flowchart illustrating a method of controlling a defrosting operation of a combined air conditioning and air conditioner using the solenoid valve according to the present invention.

As shown here, in order to determine the entry of the defrosting operation during the heating operation of the combined air-conditioning and air conditioner, the outdoor temperature sensor 130 mounted on the outdoor heat exchanger 120 is less than or equal to the first set temperature (A; 0 ° C or less). The process proceeds to the first judging step (S110) of determining whether to apply. If the outdoor temperature sensor 130 is not below the first predetermined temperature A in the first determination step, the heating operation continues.

However, when the outdoor temperature sensor 130 mounted on the outdoor heat exchanger 120 is less than or equal to the first set temperature A in the first determination step, the solenoid valve 200 using a stepping motor driven by receiving a current signal. The current signal P_E is applied to the first step pulse to open the solenoid valve 200 (S120), and after measuring the outdoor temperature by the outdoor temperature sensor 130, the second set temperature (B; 0 ° C) The process moves to the second judging step (S130) for comparing abnormality. When the outdoor temperature X_T measured in the second determination step is greater than or equal to the second set temperature B, the solenoid valve 200 is shut off, and the heating operation is continued (S300).

If the outdoor temperature X_T measured by the outdoor temperature sensor 130 is not equal to or greater than the second set temperature B in the second determination step, the measured outdoor temperature X_T is the first set temperature A. The process proceeds to the third determination step (S130) for comparing the greater value.

When the outdoor temperature X_T measured in the third judging step is greater than the first set temperature A, compares whether the rate of change of the measured outdoor temperature X_T for a specific time t is greater than the set value z. Move to the fourth determination step (S150). A fifth determination step S160 of determining whether the measured outdoor temperature X_T is greater than or equal to the second set temperature B when the rate of change of the outdoor temperature X_T measured in the fourth determination step is greater than the set value z. Go to). When the outdoor temperature X_T measured in the fifth determination step is greater than or equal to the second set temperature B, the solenoid valve 200 is shut off, and the heating operation is continued (S300). However, when the outdoor temperature X_T measured in the fifth judging step is not equal to or greater than the second set temperature B, the solenoid valve 200 is opened by applying the current signal P_E with the set step a pulse. (S170). When the rate of change of the outdoor temperature X_T measured in the fourth judging step is not greater than the set value z, the solenoid valve 200 is opened (S170) by applying the current signal P_E with the set step a pulse. In operation S180, the controller determines whether the applied current signal is the n-th (upper limit) pulse that completely opens the solenoid valve 200. If the current signal applied in the sixth judging step is not the nth (upper limit) step pulse for completely opening the solenoid valve 200, the circuit circulates to the fourth judging step S150. However, when the current signal applied in the sixth judging step is an n-th (upper limit) step pulse for completely opening the solenoid valve 200, it is determined whether the measured outdoor temperature X_T is greater than or equal to the second set temperature B. FIG. The determination proceeds to the seventh determination step S160. If the outdoor temperature X_T measured in the seventh judging step is not equal to or greater than the second set temperature B, the n th (upper limit) step pulse for completely opening the solenoid valve 200 is continuously maintained (S190). Circulation to the seventh determination step (S200). However, when the outdoor temperature X_T measured in the seventh judging step is greater than or equal to the second set temperature B, the solenoid valve 200 is shut off and heating operation continues (S300).

When the outdoor temperature X_T measured in the third judging step is not greater than the first preset temperature A, the solenoid valve 200 is opened by applying a current signal P_E by increasing the pulse to the second stage. S210), and moves to the eighth determination step S220 for comparing whether the outdoor temperature X_T measured by the outdoor temperature sensor 130 is greater than the first set temperature A. FIG. When the outdoor temperature X_T is greater than the first preset temperature A in the eighth determination step, the control unit 110 returns to the fourth determination step S150. However, when the outdoor temperature X_T is not greater than the first set temperature A in the eighth determination step, it is determined whether the applied current signal is the nth (upper limit) step pulse for completely opening the solenoid valve 200. The flow moves to the ninth determination step S180. In the ninth determination step, when the n-th (upper limit) pulse is completely opened, the solenoid valve 200 is returned to the seventh determination step S200. However, if it is not the n-th (upper limit) pulse in which the solenoid valve 200 is fully opened in the ninth determination step, the pulse step value of the current current signal is increased by one step (S240), and the eighth determination The flow proceeds to step S220.

Therefore, as described above, the present invention includes a solenoid valve using a stepping motor driven by receiving a current signal instead of an anisotropic valve, thereby subdividing the opening / closing change of the valve, thereby efficiently controlling the refrigerant flow rate, and the outdoor heat exchanger. There is an advantage in reducing noise due to rapid pressure imbalance inside.

In addition, there is an advantage that only a suitable amount of the high-temperature / high-pressure refrigerant gas discharged to the compressor can be sent to the outdoor heat exchanger when the frost is formed.

In addition, it is advantageous in terms of energy efficiency as the reduction in heating capacity is reduced compared to general non-stop defrosting operation during defrosting operation.

Claims (6)

Refrigerant from the compressor, including a compressor, an indoor heat exchanger, a filter, a capillary tube, an outdoor heat exchanger, and an accumulator, is selectively supplied to the indoor heat exchanger and the outdoor heat exchanger through all four sides and circulated to return to the compressor. In A solenoid valve branched from a refrigerant pipe between the capillary tube and the outdoor heat exchanger and connected between the compressor and the four sides; Defrosting operation control device for a combined air-conditioning and air conditioner using an electronic valve, characterized in that it comprises an outdoor temperature sensor mounted to the outdoor heat exchanger for detecting the outdoor temperature. According to claim 1, wherein the solenoid valve defrosting operation control apparatus for a combined air-conditioning and heating air conditioner using a stepping motor that is driven by receiving a current signal. In the defrosting operation control method of a combined air conditioning and heating, Determining an entry point of a defrosting operation for removing frost formed on a coil when an outdoor heat exchanger absorbs ambient heat during heating operation of the combined air-conditioning and heating unit; Determining whether the outdoor temperature detected by the temperature sensor is less than or equal to a predetermined temperature after comparing an outdoor heat exchanger coil temperature with a freezing point or less; If the outdoor temperature detected by the temperature sensor is less than the set temperature, increasing the current signal pulse to the stepping motor step by step to open the solenoid valve step by step; Including the steps described above, only a suitable amount of the high-temperature / high-pressure refrigerant gas discharged from the compressor is sent to the outdoor heat exchanger to perform an efficient defrosting operation to remove frost formed on the outdoor heat exchanger coil and at the same time smooth heating operation. Defrosting operation control method of a combined air conditioning and heating air conditioner, characterized in that to perform. In the defrosting operation control method of a combined air conditioning and heating, A first determination step of first determining whether the outdoor temperature sensor mounted on the outdoor heat exchanger is equal to or less than a first set temperature A in order to determine the entry of the defrosting operation during the heating operation of the combined air-conditioning and air conditioner; If the outdoor temperature sensor is less than or equal to the first set temperature A in the first determination step, continuing heating operation; In the first determination step, when the outdoor temperature sensor mounted on the outdoor heat exchanger is less than the first predetermined temperature A, a current signal is inputted to the solenoid valve using a stepping motor driven by receiving a current signal. A second judging step of applying (P_E) to open the solenoid valve, measuring the outdoor temperature by the outdoor temperature sensor, and then comparing the temperature with a second set temperature (B) or more; If the outdoor temperature X_T measured in the second determination step is equal to or greater than the second set temperature B, shutting off the solenoid valve and continuing heating operation; If the outdoor temperature X_T measured by the outdoor temperature sensor is not equal to or greater than the second set temperature B in the second determination step, is the measured outdoor temperature X_T greater than the first set temperature A? A third judgment step of comparing When the outdoor temperature X_T measured in the third judging step is greater than the first set temperature A, whether the rate of change of the measured outdoor temperature X_T for a specific time t is greater than the set value z is determined. Comparing the fourth judgment step, A fifth determination step of determining whether the measured outdoor temperature X_T is greater than or equal to the second set temperature B when the rate of change of the outdoor temperature X_T measured in the fourth determination step is greater than a set value z; , If the outdoor temperature X_T measured in the fifth determination step is equal to or greater than the second set temperature B, shutting off the solenoid valve and continuing heating operation; If the outdoor temperature X_T measured in the fifth judging step is not equal to or greater than the second set temperature B, applying the current signal P_E with the set step a pulse to open the solenoid valve; When the rate of change of the outdoor temperature X_T measured in the fourth judging step is not greater than the set value z, the current signal P_E is applied by the set step a pulse to open the solenoid valve, and the applied current signal. A sixth judging step of determining whether is an n-th (upper limit value) pulse for completely opening the solenoid valve; Circulating to the fourth judging step if the current signal applied in the sixth judging step is not the nth (upper limit) step pulse for completely opening the solenoid valve; A seventh step of determining whether the measured outdoor temperature X_T is greater than or equal to the second set temperature B when the current signal applied in the sixth judging step is an n-th (upper limit) pulse that completely opens the solenoid valve; Judgment step, If the outdoor temperature X_T measured in the seventh judging step is not greater than or equal to the second set temperature B, the nth (upper limit) step pulse for completely opening the solenoid valve is maintained, and the seventh judging step Circulating to, When the outdoor temperature X_T measured in the seventh judging step is equal to or greater than the second set temperature B, shutting off the solenoid valve and continuing heating operation; If the outdoor temperature X_T measured in the third judging step is not greater than the first set temperature A, the temperature is increased to the second step pulse to apply the current signal P_E to open the solenoid valve, and the outdoor An eighth determination step of comparing whether the outdoor temperature X_T measured by the temperature sensor is larger than the first set temperature A; Returning to the fourth determination step when the outdoor temperature X_T is greater than the first predetermined temperature A in the eighth determination step; The ninth determination step of determining whether the current signal applied is the nth (upper limit) step pulse for completely opening the solenoid valve when the outdoor temperature X_T is not greater than the first set temperature A in the eighth determination step. Wow, Returning to the seventh determination step in the case of the nth (upper limit value) pulse in which the solenoid valve is fully opened in the ninth determination step; In the ninth determination step, if the n-th (upper limit) pulse that the solenoid valve is not fully opened, increasing the pulse step value of the current current signal by one step, and circulating to the eighth judgment step. Defrosting operation control method for a combined air-conditioning and heating air conditioner using a solenoid valve. 5. The method for controlling defrosting operation of a combined air-conditioning and air conditioner using the solenoid valve according to claim 4, wherein the first set temperature is set to 0 ° C or less. 5. The method for controlling defrosting operation of a combined air-conditioning and air conditioner using the solenoid valve according to claim 4, wherein the second set temperature is set to 0 ° C or higher.