JPS62172139A - Control device for defrosting of air-conditioning machine - Google Patents

Abstract

PURPOSE:To obtain a defrosting control device capable of being simplified by a method wherein heating operation is effected after the temporary stop of the operation of a compressor from the restarting of the operation to a time when a predetermined time has elapsed while defrosting operation is controlled by a comparison between a boundary temperature in accordance with the memorized frequency of an power source and a detected temperature after the predetermined time has elapsed. CONSTITUTION:When an outdoor side heat exchanger 5 has not frosted yet, both of the suction refrigerant temperature Ts of a compressor 1 and the inlet pipeline temperature (t) of an indoor side heat exchanger 3 are high, however, these temperatures are reduced gradually and when the outdoor side heat exchanger 5 is frosted, heating capacity is reduced remarkably and the inlet pipeline temperature (t) of the indoor side heat exchanger 3 is reduced extremely. When the inlet pipeline temperature (t) has become lower than a set pipeline temperature (t1), the heating capacity is reduced and frosting is advanced, therefore, the heat exchanger 3 is defrosted. Generally, the inlet pipeline temperature (t) of the indoor side heat exchanger 3 is different depending on whether the titled machine is operated under 50Hz or 60Hz, therefore, the decision of a defrosting should be effected only by switching in accordance with the operating frequency of 50Hz or 60Hz to realize the heating capacity sufficiently. Accordingly, the proper decision of defrosting operation may be effected with the inlet pipeline temperature of the indoor side heat exchanger 3 under the operating frequency of 50Hz or 60Hz.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a defrosting control device for a separate heat exchanger type air conditioner, and in particular to a defrosting control device for an outdoor heat exchanger.
The present invention relates to an air conditioner in which i''i is circulated indoors.

2. Related Art Conventionally, as shown in Japanese Patent Publication No. 59-34255 (1983), the temperature change to the outdoor +1111 heat exchanger is based on both the temperature change of the indoor heat exchanger and the change in the indoor humidity.
Rotate the Ajf state and remove heating operation? Vi driving 1li
11 The technology to @ has been developed.

Problems to be Solved by the Invention However, such a conventional configuration requires a plurality of temperature detection elements, complicating the circuit itself. Furthermore, in air conditioners, the amount of air blown inside the room is usually variably set arbitrarily, and for this reason, adding an air amount correction means to the conventional technology would further complicate the circuit. .

Moreover, since this configuration detects the temperature of the gas-liquid mixed refrigerant while it is flowing through the heat exchanger, it is possible to
j Humidity change at T (low temperature, frost formation in a minute range)
11 constants must be carried out, and there is a problem that the detection accuracy is unstable.

In addition, the compression function power differs between 50 Hz and 60 Hz depending on the power supply frequency, and 60 Hz generally has a higher pressure, and even at the same indoor heat exchanger temperature, 50 Hz
At 60 Hz and 60 Hz, the condition of the exchanger outside the room was different, and it was not possible to defrost properly.

As described above, the conventional technique 8tIF has many problems, and improvements are needed.

In view of the above-mentioned conventional problems, the present invention provides a defrosting control device that can be simplified in configuration without sacrificing the advantages of the prior art.

Means for Solving the Problems In order to solve the above problems, the present invention provides a control device for controlling the refrigeration cycle from the heating cycle to the defrosting cycle, as shown in FIG. A time measuring means for totaling the time from the restart of operation after the temporary stop of operation, a set time storage means for storing a preset time, and an open time measuring means for detecting the time when the ltn is detected. a first comparing means for detecting and outputting a coincidence of the set times; and a temperature detecting means for detecting the temperature of the pipe connected to the refrigerant pipe 1j of the indoor heat exchanger. , storage means for storing a boundary temperature at which the heating cycle is switched to the defrosting cycle each time the setting is performed;
A clock input means for inputting the power supply frequency, a frequency discrimination means for distinguishing between different frequencies of the power supply, and a setting for changing the boundary value temperature of the set temperature storage means according to the output signal from the frequency discrimination means. The temperature detected by the temperature switching means and the temperature detection means is the set temperature record.
A second comparison means outputs a signal indicating that the temperature has fallen below h(X temperature), a set time elapsed signal from the first comparison means, and a boundary stored in the second comparison means. 'I'1 constant means for determining switching from the heating cycle to the defrosting cycle based on the value decrease signal;
゛According to the output of the adjustment means]] [Remove the refrigeration cycle from the heating operation described in I: (to jjJ rotation;

Effect This F: t, after the temporary suspension of operation of the pressure point, 1
■f Warming operation is maintained at 61゛] until a predetermined time elapses from the start of operation, and at the predetermined time [711 after loading, 1α constant, L1i degree: written in Yamaguchi Means] 0. Power supply notification 1 boundary 1 presentation according to the wave number! :ft j! (a) Output of the means for dispensing 1 degree and temperature 1 degree (by the ratio of 1 degree, division: +'+'i1 operation is controlled by 1b hw #")
Embodiment 0 An embodiment of the present invention will be described below with reference to FIGS. 2 to 5.

FIG. 2 is a refrigeration cycle diagram showing one embodiment of the present invention.

In the same trap, the refrigeration cycle consists of compressor 1 and four-way switching valve 2.
, an indoor heat exchanger 3, a pressure reducer 4, and an outdoor heat exchanger 5 are connected in sequence. Reference numeral 6 denotes a pipe temperature detection element, which is attached to a pipe that is on the refrigerant inlet side of the indoor heat exchanger 3 (condenser) during heating. In this case, during cooling operation, the refrigerant flows in the direction of the solid line arrow in the figure, and during heating operation, the 1d four-way switching valve 2 is switched, so that the refrigerant flows in the direction of the broken line arrow in the figure.

In addition, the compressor 1, four-way switching valve 2, pressure reducer 4, outdoor heat exchanger 5, and outdoor blower 8
In addition, a microcomputer (hereinafter referred to as LSI) is programmed with the above-mentioned indoor JII heat exchanger 3 and indoor blower 7, as well as a pipe temperature detection element 6, a temperature control function, a breakable function, etc. An operation control section (not shown) having an indoor unit (BK) is provided. Here, the pipe temperature detection element 6 is placed 11" away from the wind circuit where it is not exposed to the air blown by the indoor blower 7. Alternatively, it may be placed near the indoor unit B.

Next, the operation control circuit configuration will be explained with reference to FIG. Here, the same parts as in FIG. 2 are given the same numbers and will be explained.

In the same figure, C-D respectively indicate one part of operation IV11 bait and a remote control part (hereinafter referred to as the operation part),
The operation control unit C includes a transformer 22 that steps down the AC power supply 21.
, a DCC power supply reciprocating section 23 that converts alternating current into direct current, a regulator 25 that uses the direct current from the DCC power reciprocating section 23 as input power to the LSI 24, and a reference voltage generation circuit 26.
Defrost setting circuit 27 that switches the operating temperature for defrosting
, the base/11 voltage generation circuit 26 and the defrost setting circuit 27
An output consisting of a comparison circuit 28 that compares the reference composite input of L and the input of the pipe temperature detection element 6, and a group of relay elements that control the operation of the 1EE compressor 1, the four-way switching valve 2, the indoor blower 7, and the outdoor blower 8. The regulator 25 includes a circuit 29, an oscillation circuit 30 that creates the basic timing for various signal processing of the LSI'24, and a reset circuit 31 that controls various signal processing. The output circuit 29 is connected to the boat P1 of the LSI 24, and the output circuit 29 is connected to the boat P1 of the LSI 24.
A defrosting setting circuit 27, which determines the operating temperature point at which the heating operation is switched to the defrosting operation A11 operation, is connected to the boat P21, is connected to the ratio 1-bit circuit 2Ell-t boat P3i, and is further connected to the oscillation circuit. 30, the reset circuit 31 is connected to P41, P42, and P51, respectively.

The reference voltage generation circuit 26 is constituted by resistors 101 and 102, the defrost setting circuit 27 is configured by the resistor 103 connected to the boat P21, and the output circuit 2
9 is composed of relay elements R1, R2, R3, R4, R5, and R6 connected to each boat P11 to P16. Relay element R1 corresponds to the compressor, relay element R2
corresponds to a four-way switching valve, relay element R3 corresponds to an outdoor blower, and relay elements R4, R5, and R6 respectively switch the air volume of the indoor blower to "low speed,""mediumspeed," and "high speed."
Corresponds to the speed terminal of

Furthermore, an inverter IC circuit 33 is connected to the port Po of the LSI 24, and inputs the waveform signal rectified by the DC power generation section 23 to the LSI 24 described in iiJ. Therefore, 1] The LSI 24 shown on the right has an Ichihara frequency of, for example, 50 Hz or 60 Hz depending on the period of this waveform signal.
z is determined, the result is output to the boat P21, the defrost setting circuit 27 is operated, and the synthesis input in the comparison circuit 28 is changed to base r1. In the tree embodiment, the high frequency (60H
z), the Baud hP21 outputs "Hl", increases the base 71+4 combined input voltage, and returns the boundary value.
Take it to the next level!・It is set to enable.

Also, is 51 the intake air? +'+' is an air temperature detection element that detects degrees, 52 is a plurality of resistors 1j'n 110 to 11
5 is an A/D exchange circuit with information on C, 53 is +ifr air temperature air temperature (i) The ratio of the input of the output element 51 and the input from each 52 of the A/D exchange circuit 5 is calculated, and the compression machine 1 run/stop 42 (This is a comparison circuit that outputs C).

1111 air temperature detection element 51, A/D conversion circuit 52
constitutes the function of the thermostat that adjusts the room temperature,
+if notation The A/D conversion circuit 52 is sent to ports P71 to P74 of the LSI 24, and the output of the comparison circuit 53 is sent to the ports P71 to P74 of the LSI 24.
They are respectively connected to 24 boats P81. Since this room temperature control is not related to the gist of the present invention, detailed explanation will be omitted.

Next, the operation section is set to ``Low speed'', ``Medium speed'', ``High speed'', ``
An air volume switching operation section 41 equipped with "stop" selection switches S1 to S4, and switches 311 to S1 for setting and operating room items.
4, the room temperature setting operation section 42 has an angle of 11°η. The air volume switching operation section 41 and the room temperature setting operation section 42 are connected to the boats P61 to P55 of the LSI 24, respectively.

this! g:, ;3 switching operation section 41, room temperature setting operation section 42
By operating each of them, the content of the technique 1 is processed inside the LSI 24, and the output circuit 29 and the room temperature 1 control related circuit section perform 01.

Furthermore, the relationship between the above F:FG composition and the I'l'/j composition shown in FIG. 1 will be explained.

The pipe temperature detection element 6 is used as a temperature detection means (upper and lower).
(1. The voltage generation circuit 26 and the defrosting setting circuit 2 are connected to the set temperature storage means, the ratio soft circuit 28 corresponds to the second ratio soft means, and the impark IC circuit 33 and the DC power generation )
(23) corresponds to a clock input means, and (5) the defrost setting circuit 27 also corresponds to a set temperature switching means;
This corresponds to a set time storage means, a first comparison means, and a constant value means, and the output circuit 29 corresponds to an MIiR output means.

Next, the OJ operation from the start of the heating operation to the defrosting operation will be explained based on FIGS. 2 to 5.

The discharge refrigerant temperature of the compressor 1 is Td1, the suction refrigerant temperature of the compressor 1 is Ts, the discharge pressure of the compressor 1 is Pct, the suction pressure of the compressor 1 is Ps, and the polytropic index is n (where 1
(In the relationship of K, where K is the adiabatic compression index),
The discharge refrigerant temperature Td is determined by the following formula (%). Therefore, when the outdoor non-exchanger 5 is not frosted, the suction refrigerant i!
+'A degree Ts is high, and discharge refrigerant bath 11 degree Td is also high.

As the outside air drops and frost grows, the suction refrigerant temperature Ts decreases, and the discharge refrigerant temperature Td also decreases. The pipe temperature detection element 6 in the present invention is installed at the inlet pipe of the indoor heat exchanger 3, and detects the temperature of the part through which the high-temperature, high-strength superheated refrigerant gas discharged from the compressor 1 flows. In this case, the temperature is a certain degree lower than that of the discharged gas due to heat loss in the internal and external connecting pipes, etc.

Therefore, as shown in FIG. 4, when the outdoor heat exchanger 5 is not frosted, both the suction refrigerant temperature Ts of the compressor 1 and the inlet pipe temperature t of the indoor heat exchanger 3 are high, and as G'Ai advances, As the temperature gradually decreases and frost formation occurs which significantly reduces the heating capacity, the temperature t of the inlet pipe of the room pressure side heat exchanger 3 extremely decreases. That is, if the inlet pipe temperature t becomes equal to or lower than the set pipe temperature 11, the heating capacity decreases, and since frost formation has progressed, it is necessary to defrost.

Moreover, in the power supply frequency, the capacity of the compressor 1 differs between 50 Hz and 60 Hz, and the voltage and discharge temperature of the outdoor heat exchanger 5 also differ when there is a light frost.

That is, at 50 Hz and 60 Hz, the inlet pipe temperature of the indoor heat exchanger 3 (also different, the set pipe temperature t
1 to 50) (Switch and divide between z and 60 Hz: iA￥
If '14J determination is not performed, appropriate defrost detection cannot be performed depending on the power supply frequency, for example, at 60 Hz, and the heating capacity cannot be fully demonstrated.

In this way, since the temperature of the inlet pipe of the indoor heat exchanger 3 is the temperature of the refrigerant gas in the superheated region, it is less affected by the air volume of the indoor fan 7, and the temperature of the inlet pipe of the indoor heat exchanger 3 is At 50Hz and 60Hz, suitable G (1') defrosting operation can be performed in a closed area.

Based on the above explanation, the υ11 subcircuit shown in Figure 3 is as follows:
The contents of the flowchart shown in FIG. 5 are controlled.

For convenience of explanation, it is assumed that during heating operation, each of the phosphorus elements R1 to R4 of the compressor, four-way switching valve, outdoor blower, and base circular blower operated in "low connection" is operating at 03. do.

That is, in step 1 of Fig. 5, the power supply frequency is 60
Hz, and in step 2, if it is 60 Hz, set the boat P21 to Hi, and if it is 50 Hz,
Boat P21 is turned off. Specifically, the waveform signal from the inverter IC circuit 33 shown in FIG.
The frequency discrimination means inside makes a discrimination, and if the output side port P21 of the LSI 24 is 60Hz, it becomes Hi, and the resistor 1
The group 111 created by the partial pressure of
It changes depending on Hz.

Thereafter, when the heating operation is started as shown in step 3, the microcomputer 9 sets a climber count for a predetermined time T1 (step 4). This timer power set is T1 hours (for example, 1 hour) from the start of the heating operation.
This is to maintain the heating operation (for example, 1 liter high
Continuous UQ heating for T1 hours within 1 hours is also one means.

And once the timer count is set, step 5
It is determined that the T1 time has passed. The heating operation is continued until the time T1 has elapsed.

When time T1 has elapsed, the process moves to step 6, where a second timer counter is set, and in step 7, it is determined in the microcomputer 9 whether or not the compressor 1 is operating. If the tentative operation is not performed (if step 7 is not satisfied), the process returns to step 6 and the second timer is reset.

Next, when the condition of step 7 is satisfied, 1 is reached in step 8.
It is determined that two hours (for example, four minutes) have passed.

When the compressor 1 has been operated continuously for 12 hours, the process moves to step 9, where the pipe temperature t is read by the pipe temperature detection element 6. A determination is made as to whether or not this is the case.

Then, the process moves to step 11 and the pipe temperature t is set at step 1.
It is determined whether the temperature is lower than the set pipe temperature t1 set in step 2 and 2. Specifically, the comparison circuit 2B in FIG. 3 makes the determination.

Then, when the conditions of step 11 are satisfied, step 12
The defrosting operation starts. In other words, each relay element R1, R2, R3, R4 of the output circuit 29 shown in FIG.
operate, switch the four-way selector valve 2, and if necessary, stop the compressor 1 for a certain period of time, and stop the indoor air blower @ 7 and the outdoor blower 8. Then, in the cooling cycle. The weight is removed. The content of this defrosting operation is well known in the art, so a detailed explanation will be omitted. Restoration of the heating operation can also be carried out by any suitable means, as is well known in the past.

In this embodiment, the defrosting operation is performed by switching from the heating cycle to the cooling cycle.
For example, it goes without saying that a configuration may be adopted in which the heating cycle is maintained and a separately stored refrigerant is flowed to the outdoor heat exchanger, or a configuration in which a separate heat source is used to melt the frost. Further, the compressor 1 may be operated continuously when switching to defrosting operation, and may be temporarily stopped when returning to heating operation.

Moreover, each setting time up to the defrosting operation is not limited to that of this embodiment, and may be set arbitrarily. Furthermore, the output status of the boat P21 according to the power frequency may be set to "H!" at 50 Hz, and the set value may be changed. Effects of the Invention As described above, according to the present invention, With the above structure, the temperature of the refrigerant gas in the superheated region is detected at the indoor heat exchanger inlet piping, and accurate defrosting operation is performed at one temperature detection point without being affected by the indoor air volume. The actual heating capacity can be determined very easily, and it is possible to determine whether the refrigerant has sufficient heat for heating at the inlet side of the indoor heat exchanger. J1 ((Make sure!!!11
It is possible to defrost the air by cutting it off. Furthermore, even if the power supply frequency is different, the boundary according to the frequency (direction #+i'+
Defrosting can be done reliably since the temperature is changed to 30°C.

That is, the present invention uses complete >t? 1-1 Inlet By detecting the refrigerant temperature on the side, a large temperature change from non-frosting to frosting can be taken, and heating capacity close to the limit can be brought out by detecting one point of 71'l'. Kibatsu F again! 11 is
Since frost formation is not detected until a certain period of time has elapsed from the start of heating, heating capacity is ensured during that period of time and comfort is not compromised.

In addition, after the compressor is temporarily stopped during heating operation, frost formation is not detected until a certain period of time has elapsed since the restart of operation. Detects the temperature and turns 111
Despite this, there is no need to start defrosting operation, resulting in improved reliability and other effects.

4. Simple explanation of ``m'' 1 Figure 1 shows the defrosting of the present invention;
A block diagram expressed by the means for realizing the contract, Fig. 2 is a refrigeration cycle diagram of the air-1':J machine showing one implementation 11 of the present invention, and Fig. 3 is a defrosting diagram of the air-conditioner '1'0. Control device 1
``ffi circuit diagram, Figure 4 shows the defrosting 1171'' refrigerant 1fllX to the indoor heat exchanger in the control device.
FIG. 5 is a flow chart 1 showing the operation details of the defrosting control device i'ff.

1... Compressor, 2... Four-way switching valve, 3...
...Indoor heat exchanger, 5...Outdoor heat exchanger, 6
...Piping i7. ILJ′! i detection element (temperature detection means), 23...DC electric coolant generator main unit (clock input means), 24...LSI (frequency discrimination means, time meter 6)
111 means, set time storage means, first comparison means, determination means), 26... Reference voltage generation circuit (set temperature storage means), 27... Defrost setting circuit (set temperature storage means) storage means), 28...comparison circuit (second comparison means)
, 29...output circuit (selection output means), 30...
・Oscillation circuit, 31... Reset circuit, 33...
... Impark IC circuit (clock input means).

Name of agent: Patent attorney Toshio Nakao (1st person)
Figure/-11 Compacting machine 2- Four-way cutting machine 3- Indoor U-bed cross-pinning, 4- Makoto's vessel A-11 room, Tato unit B--1 presentation unit □-1 layer drop- 7---- 1. -, Yu, -Figure 4 Ts---)

Claims (1)

[Claims] A refrigeration cycle equipped with a compressor, an indoor heat exchanger, a pressure reducing device, and an outdoor heat exchanger is provided with cycle switching means for switching between a heating cycle and a defrosting cycle, and the cycle switching means is configured to switch between a heating cycle and a defrosting cycle. A time measuring means for measuring the time from restarting the compressor after the compressor is temporarily stopped, a set time storage means for storing a preset time, and the time measuring means for switching the control device to the cycle. a first comparison means for detecting and outputting a match between the detected time and the time set in the set time storage means; and a temperature for detecting the temperature of a pipe connected to the refrigerant inlet side of the indoor heat exchanger. a detection means, a set temperature storage means for storing a boundary value temperature for switching a heating cycle to a defrosting cycle, a clock input means for inputting a power supply frequency, a frequency discrimination means for discriminating between different frequencies of the power supply, and a frequency discrimination means for the frequency discrimination means. a set temperature switching means for switching the boundary value temperature of the set temperature storage means based on an output signal from the set temperature storage means; a second comparing means for outputting, a determining means for determining switching from a heating cycle to a defrosting cycle based on a set time elapsed signal from the first comparing means and a boundary value decrease signal from the second comparing means; A defrosting control device for an air conditioner comprising a selection output means for controlling the refrigeration cycle from heating operation to defrosting operation according to the output of the determination means.