JP2012002413A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner that operates without deficiency in performance by controlling an optimal throttle mechanism in response to humidity.SOLUTION: The air conditioner includes: a center temperature detecting unit 5 for detecting temperature of a refrigerant pipe installed in a substantially center of an indoor heat exchanger; an outlet temperature detecting unit 14 for detecting temperature of an outlet of the refrigerant pipe when the indoor heat exchanger operates as an evaporator; and a humidity sensor 15 for detecting the indoor humidity. When the temperature difference between the temperature Teva detected by the center temperature detecting unit and the temperature Teva_out detected by the outlet temperature detecting unit is larger than the prescribed temperature difference ΔT, the opening of the expansion value of the throttle mechanism is opened. When the humidity detected by the humidity sensor is smaller than the prescribed humidity, the opening of the expansion value of the throttle mechanism is not adjusted.

Description

  The present invention relates to operation control of an air conditioner.

  Conventionally, when an indoor heat exchanger of an air conditioner is arranged in a row, an auxiliary heat exchanger is arranged on the outlet side or a device that suppresses an overheat area at the outlet is provided in order to prevent condensation of the indoor unit. (See, for example, Patent Document 1).

JP 2007-127333 A

  However, in the above-described conventional configuration, the ability to adjust the throttle mechanism even when the possibility of condensation is low, such as when the humidity is low, in order to adjust the throttle mechanism so that an overheating region cannot be taken at the outlet of the indoor heat exchanger. There was a shortage.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide an air conditioner that does not fall short of capacity by controlling an optimum throttle mechanism according to humidity.

  In order to solve the above-described conventional problems, the air conditioner of the present invention has a refrigeration cycle configured by annularly connecting a compressor, an outdoor heat exchanger, a throttle mechanism, an indoor heat exchanger, and a four-way valve. A central temperature detecting means for detecting the temperature of the refrigerant pipe at the substantially central portion of the indoor heat exchanger; and an outlet temperature detecting means for detecting the temperature of the outlet portion of the refrigerant pipe when the indoor heat exchanger acts as an evaporator; And a humidity sensor for detecting the humidity in the room, and a temperature difference between the temperature Teva detected by the central temperature detecting means and the temperature Teva_out detected by the outlet temperature detecting means is a predetermined temperature difference ΔT set in advance. Is larger than the opening of the throttle mechanism, and when the humidity detected by the humidity sensor is lower than a predetermined humidity set in advance, by not adjusting the opening of the throttle mechanism, Indoor unit at low humidity When the condensation is unlikely to occur, in order to be able to operate at maximum capacity without adjusting the throttle mechanism, it is possible to improve comfort.

  The present invention can provide an air conditioner that does not fall short of capacity by controlling the optimum throttle mechanism according to humidity.

The block diagram of the refrigerating cycle of the air conditioner in Embodiment 1 of this invention Block diagram of control in the first embodiment Flowchart of the air conditioner in the first embodiment Another flowchart in the first embodiment

An air conditioner according to a first aspect of the present invention has a refrigeration cycle configured by annularly connecting a compressor, an outdoor heat exchanger, a throttle mechanism, an indoor heat exchanger, and a four-way valve, and is substantially at the center of the indoor heat exchanger. Central temperature detecting means for detecting the temperature of the refrigerant pipe of the part, outlet temperature detecting means for detecting the temperature of the outlet part of the refrigerant pipe when the indoor heat exchanger acts as an evaporator, and humidity for detecting the humidity in the room When the temperature difference between the temperature Teva detected by the central temperature detecting means and the temperature Teva_out detected by the outlet temperature detecting means is larger than a predetermined temperature difference ΔT set in advance, the throttle mechanism If the humidity detected by the humidity sensor is lower than the preset predetermined humidity, the opening of the throttle mechanism is not adjusted, so that the dew condensation on the indoor unit is low. When it is hard to occur In order to be able to operate at maximum capacity without adjusting the throttle mechanism, it is possible to improve comfort.

  In the air conditioner according to the first aspect of the present invention, in particular, in the air conditioner of the first aspect of the present invention, by changing the predetermined temperature difference ΔT according to the humidity detected by the humidity sensor, the possibility of dew condensation on the indoor unit is high or low. By changing the threshold value of the center of the heat exchanger and the outlet temperature for adjusting the throttle according to the humidity, it is possible to operate optimally at each humidity and to operate without impairing comfort. It becomes.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a configuration diagram of a refrigeration cycle of the air conditioner according to the first embodiment. In FIG. 1, the air conditioner of the present embodiment is composed of an indoor unit 1 and an outdoor unit 2. The indoor unit includes an indoor suction temperature detecting means 3, an indoor heat exchanger 4, and an indoor heat exchanger. 4 is provided with a central temperature detecting means 5 for detecting the temperature of the refrigerant pipe in the substantially central portion, and an indoor fan 6.

  The outdoor unit 2 includes an outdoor suction temperature detection means 7, an outdoor heat exchanger 8, an outdoor heat exchanger temperature detection means 9, an outdoor blower 10, a compressor 11, a throttle mechanism 12, and a four-way valve 13. Yes.

  Moreover, in this Embodiment, the outlet temperature detection means 14 which detects the refrigerant | coolant piping temperature of the exit side when the indoor heat exchanger 4 acts as an evaporator, and the humidity which detects indoor humidity in the indoor unit 1 Sensor 15.

  FIG. 2 is a block diagram according to the first embodiment. As shown in FIG. 2, the difference between the temperature near the center and the temperature near the outlet is calculated from the temperature information (B1) detected by the central temperature detecting means and the temperature information (B2) detected by the outlet temperature detecting means. The current temperature difference is detected by the temperature difference determination means (B4).

  Furthermore, based on the humidity information detected by the humidity detecting means (B5), the necessity of changing the opening of the throttle mechanism 12 by the throttle opening change execution determining means for determining the change of the opening of the throttle mechanism 12 is determined. Judgment is made (B6), and the value of the predetermined temperature difference ΔT is changed by the throttle opening change threshold changing means for changing the predetermined temperature difference ΔT for changing the throttle opening (B7). The opening degree of the diaphragm mechanism 12 is changed (B8).

  FIG. 3 is a flowchart according to the first embodiment of the present invention. First, when the cooling system operation is started (ST1), the evaporator central temperature Teva and the evaporator outlet temperature Teva_out are detected in ST2. In the case of multiple passes, a sensor for detecting the temperature of the refrigerant outlet pipe is provided at each outlet in the same manner, and detection is performed for each.

In ST3, the humidity detected by the humidity sensor is referred to. If this humidity is lower than a predetermined value (RH1), it is determined that the possibility of condensation is low, and the process proceeds to ST2 to change the aperture opening. Absent.

  If it is higher than RH1, in ST4, the temperature difference between the evaporator outlet temperature and the evaporator center obtained in ST2 is calculated, and if the temperature difference is larger than a predetermined temperature difference ΔT1, go to ST5. Advance and change the throttle opening until the evaporator overheat zone disappears.

  If the temperature difference is smaller than ΔT in ST4, the process returns to ST2. As a result, when the humidity is low, the throttle opening is not changed, so that the vehicle can be operated with the optimum capacity and the comfort can be improved.

  FIG. 4 is another flowchart in the first embodiment. The difference from FIG. 3 is that the value of the temperature difference ΔT1 is changed according to the humidity.

  That is, when the cooling system operation is started (ST6), the evaporator central temperature Teva and the evaporator outlet temperature Teva_out are detected in ST7.

  In ST8, the humidity detected by the humidity sensor is referred to, and the threshold value (ΔT2) of the temperature difference between the evaporator outlet temperature and the evaporator center used in ST9 according to the predetermined humidity value (RH2). To decide.

  In ST9, the evaporator outlet temperature and the temperature difference at the center of the evaporator obtained in ST2 are calculated. If the temperature difference is larger than the predetermined temperature difference ΔT2, the process proceeds to ST5, and the evaporator overheat region disappears. Change the throttle opening. If the temperature difference is smaller than ΔT2 in ST4, the process returns to ST2. Thereby, according to humidity, it becomes possible to make the reliability and comfort with respect to dew condensation compatible.

  As described above, the air conditioner according to the present invention avoids condensation on the main body, and does not perform control when there is no possibility of condensation at low humidity. Therefore, the present invention can be applied to applications such as anti-condensation measures for a refrigeration cycle circuit having an indoor fan and a throttle mechanism.

DESCRIPTION OF SYMBOLS 1 Indoor unit 2 Outdoor unit 3 Indoor suction temperature detection means 4 Indoor heat exchanger 5 Central temperature detection means 6 Indoor air blower 7 Outdoor suction temperature detection means 8 Outdoor heat exchanger 9 Outdoor heat exchanger temperature detection means 10 Outdoor ventilation Device 11 Compressor 12 Throttle mechanism 13 Four-way valve 14 Outlet temperature detection means 15 Humidity sensor

Claims (2)

It has a refrigeration cycle configured by connecting a compressor, an outdoor heat exchanger, a throttle mechanism, an indoor heat exchanger, and a four-way valve in an annular shape, and detects the temperature of the refrigerant pipe at the substantially central portion of the indoor heat exchanger. A central temperature detecting means; an outlet temperature detecting means for detecting the temperature of the outlet portion of the refrigerant pipe when the indoor heat exchanger acts as an evaporator; and a humidity sensor for detecting the humidity in the room. When the temperature difference between the temperature Teva detected by the detecting means and the temperature Teva_out detected by the outlet temperature detecting means is larger than a predetermined temperature difference ΔT, the opening of the throttle mechanism is opened. In addition, when the humidity detected by the humidity sensor is lower than a predetermined humidity set in advance, the opening degree of the throttle mechanism is not adjusted. The air conditioner according to claim 1, wherein the predetermined temperature difference ΔT is changed in accordance with humidity detected by the humidity sensor.

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