JP2508528Y2 - Air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an air conditioner, and more particularly to a pressure control device thereof.

[Conventional technology]

FIG. 3 shows a conventional refrigeration cycle diagram. As shown in the figure, the refrigeration cycle includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 3,
The expansion valve 4, the indoor heat exchanger 5, the radiant heating panel 6, the check valve 7, and the indoor blower 8 are included. The refrigerant flows during cooling as indicated by the solid arrow in FIG. 3, and during heating and radiant heating as indicated by the broken arrow.

For example, regarding the radiant heating operation, after the refrigerant compressed by the compressor 1 passes through the four-way valve 2, a part of the refrigerant is condensed by the indoor heat exchanger 5 and the radiant heating panel 6, and is condensed by the radiant heating panel 6. The refrigerant passes through the check valve 7 (only on the side of the radiation panel 6), is mixed with the refrigerant condensed in the indoor heat exchanger 5, is throttled and expanded in the expansion valve 4, and is evaporated in the outdoor heat exchanger 3,
It is sucked into the compressor 1 through the four-way valve 2 and compressed. Repeat this. In this case, although the refrigerant is flowing through the indoor heat exchanger 5, the indoor blower 8 is stopped, so that the high pressure is abnormally increased, which causes deterioration or seizure of the compressor 1.

[Problems to be solved by the device]

The above conventional air conditioner has the following problems to be solved.

That is, in the conventional refrigeration cycle shown in FIG. 3, during the radiant heating operation as described above, the amount of heat radiated by the indoor heat exchanger 5 and the radiant heating panel 6 is small, so the high pressure rises abnormally and the compressor 1 Deterioration and seizure occurred with increasing temperature.

[Means for solving the problem]

Means for Solving the Problems The present invention solves the above problems by forming a heat pump cycle by connecting a compressor, a four-way valve, an indoor heat exchanger equipped with an indoor blower, a throttle device, and an outdoor heat exchanger in this order, as well as the indoor side. In an air conditioner in which a radiant heating panel that circulates a refrigerant in parallel with a heat exchanger is connected to enable radiant heating by the radiant heating panel, pressure detection means provided so as to directly detect high pressure during radiant heating operation And the detected value of the high pressure from the pressure detecting means is the first
When the detected pressure value exceeds the second pressure set value that is lower than the first pressure set value, the indoor blower is turned on and off.
The present invention provides an air conditioner characterized by comprising a control means for operating (connection / disconnection).

[Action]

The present invention has the following operation since it has the above configuration.

That is, during the radiant heating operation, since the operating condition of the compressor and the indoor blower is controlled by the control means by the high pressure of the device detected by the pressure detecting means, the compressor is stopped by the increase degree of the high pressure and the blower is continuously operated. Or
It is possible to control ON / OFF operation, stop, etc., maintain the pressure of the device at an appropriate value by controlling the temperature of the refrigerant, prevent sudden changes in the room temperature, and cause compressor failure or damage. Can be prevented.

〔Example〕

One embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a refrigeration cycle diagram of this embodiment, and FIG. 2 is a flow chart of an example of control of this embodiment. The same components as those of the conventional example are designated by the same reference numerals, and the description thereof will be omitted.

In FIG. 1, a pressure detection unit 9 is provided on a conduit intermediate between the indoor heat exchanger 5 and the radiant heating panel 6 and the four-way valve 2 on the condensation side during radiant heating. The indoor blower 8 is connected to a controller 10 which issues an operation command such as a speed regulation and a command to the compressor 1 such as a stop. Wiring for command (energization) is provided from the controller 10 to the blower 8 and the compressor 1. Other configurations are similar to those of the conventional example.

The refrigerant flows as shown by solid arrows in FIG. 1 during cooling, and by broken arrows during heating and radiant heating.

 Next, the operation of the above configuration will be described.

Since the present invention relates to radiant heating, this embodiment will also be described for radiant heating.

In FIG. 1, the refrigerant compressed by the compressor 1 is condensed by the indoor heat exchanger 5 and the radiant heating panel 6 via the four-way valve 2, and the refrigerant condensed by the radiant heating panel 6 is checked by a check valve 7 (radiant heating). (Only on the panel 6 side), the expansion valve 4 reduces and expands, the outdoor heat exchanger 3 evaporates, the four-way valve 2 passes, and the compressor 1
It is inhaled and compressed again, and this is repeated.

At that time, the indoor blower 8 is turned on / off by the pressure detected by the pressure detection unit 9 in the middle of the four-way valve 2 which becomes the condenser inlet at the time of radiant heating, the indoor heat exchanger 5 and the radiant heating panel 6.
Operated or continuously operated. Control such as ON-OFF operation and continuous operation is performed by the controller 10 calculating the pressure detected by the pressure detection unit 9 and sending a command to the indoor blower 8.

FIG. 2 is a flow chart for controlling the refrigeration cycle of FIG. 1, in which the operation of the air conditioner is started 21, the judgment is made as to whether it is the radiant heating operation 22, the condenser inlet pressure P ₃ is detected 23, and the higher pressure set value P ₁ And condenser inlet pressure P ₃ 24, Compressor 1 stop operation
25, Comparison between lower pressure setpoint P ₂ and condenser inlet pressure P ₃ 2
6, continuous operation operation of indoor blower 27, indoor blower 8 ON-
It is OFF operation 28. Note that P ₁ is the pressure setting value of the higher one, P ₂ is the lower pressure setting value, and P ₃ is the condenser inlet pressure.

Explaining a specific example along the above flow chart, the condenser inlet pressure P ₃ is detected during radiant heating, and the compressor 1 is stopped when the result P ₁ <P ₃ of the comparison with the higher pressure setting value P ₁ , When the result of comparison with the lower pressure set value P ₂ is P ₂ > P _{3, the} indoor blower 8 is turned on and off, and when P ₂ ≦ P ₃ ≦ P ₁ , the indoor blower 8 is continuously operated. In this case, the indoor blower 8 may be stopped when P ₂ > P ₃ .

As described above, according to this embodiment, if the inlet pressure of the condenser (the indoor heat exchanger 5, the radiant heating panel 6) is abnormally high, the operation of the compressor 1 is stopped, and if it is between the high and low set values, the indoor If the blower 8 is continuously operated and the value is lower than the lower set value, the indoor blower 8 is turned on / off or stopped, so that the temperature of the refrigerant and the pressure associated therewith are always kept at appropriate values. There is an advantage that abnormal pressure is generated due to the high temperature, and the problem that the compressor 1 is deteriorated or seized is solved.

[Effect of device]

Since the present invention is configured as described above, it has the following effects.

That is, with respect to the radiant heating due to the stop of the indoor blower, the high pressure of the refrigeration cycle is used as an index value to stop the compressor or to control the indoor blower for the indoor heat exchanger to prevent a sudden change in the indoor temperature. As a result, a comfortable heating can be realized, and an abnormal rise in high pressure is prevented, so that an air conditioner without seizure or deterioration of the compressor can be obtained.

Further, since the abnormally high pressure is eliminated, the input of the air conditioner can be reduced, and efficient radiant heating can be achieved. Furthermore, the high-pressure pressure of the compressor is detected to control the ON / OFF of the indoor blower and the start / stop of the compressor, so that the refrigerant state is in the overheat range.
This pressure enables smooth operation control in both the saturation range and the supercooling range.

[Brief description of drawings]

FIG. 1 is a refrigeration cycle diagram of an air conditioner according to an embodiment of the present invention, FIG. 2 is a control flowchart of the above embodiment, and FIG. 3 is a refrigeration cycle diagram of a conventional air conditioner. 1 …… compressor, 3 …… outdoor heat exchanger, 4 …… expansion valve, 5 …… indoor heat exchanger, 6 …… radiant heating panel, 7 …… check valve, 8 …… indoor blower, 9… … Pressure detector, 10… Controller.

Claims (1)

(57) [Scope of utility model registration request] 1. A heat pump cycle is constructed by connecting a compressor, a four-way valve, an indoor heat exchanger equipped with an indoor blower, a throttle device, and an outdoor heat exchanger in this order, and at the same time as the indoor heat exchanger. A radiant heating panel that circulates the refrigerant in parallel is connected, and in an air conditioner that enables radiant heating by the radiant heating panel, pressure detection means provided so that the high pressure during radiant heating operation can be directly detected, When the detected value of the high pressure from the pressure detection means exceeds the first pressure set value, the compressor is stopped and the detected value is lower than the second pressure set value lower than the first pressure set value. An air conditioner characterized by comprising control means for turning on and off (connecting / disconnecting) the indoor blower when it is small.