JPS6217551A - Air-conditioning device - Google Patents

Abstract

PURPOSE:To defrost respective outdoor heat exchangers in the air-conditioning device perfectly by a method wherein one set of refrigerating cycle is provided with a plurality of outdoor heat exchangers while temperature detecting means are attached to respective outdoor heat exchangers. CONSTITUTION:The temperature detecting means 1, 2 are attached to respective outdoor heat exchangers 7, 8 while the detecting outputs of respective tempera ture detecting means 1, 2 are outputted into a defrost starting deciding means 3 and a defrost finishing deciding means 4 respectively. Defrosting starting signal is outputted in case either one of the outdoor heat exchangers 7, 8 has become lower than a defrost starting set value. On the contrary, defrost finishing signal is outputted in case both of the outdoor heat exchangers 7, 8 become higher than a defrost finishing set value. According to this method, defrosting operation is started when any one of detecting temperatures of a plurality of outdoor heat exchangers has become lower than the set temperature for starting defrosting operation while the defrosting operation is effected so as to be finished when all of the plurality of outdoor heat exchangers has becomes higher than a set temperature for finishing the defrosting operation.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides a circuit having several outdoor heat exchangers in one refrigeration cycle, in which the temperature of each coil of the several outdoor heat exchangers is controlled. The air conditioner #1C1a is capable of detecting the temperature of each fill and performing an optimal defrosting operation based on the temperature of each fill.

[Conventional technology]

Generally, the determination as to whether or not to perform defrosting operation is made based on the temperature of the outdoor heat exchanger during heating.

If the evaporation temperature is below the defrosting start set temperature, the defrosting operation is started, and if the temperature of the outdoor heat exchanger is above the defrosting end set temperature, the defrosting is ended.

Conventionally, the temperature of the heat exchanger in an air conditioner having multiple outdoor heat exchangers has been detected by attaching a temperature detection means 1 to the branch point of the outdoor heat exchanger, as shown in Fig. 3. When the detected value of the means 1 is lower than the defrosting operation start temperature, the defrosting start determining means 3 determines to start defrosting, and the determined contents are stored in the defrosting information storage means 5.

Based on the defrosting start determining means stored in the defrosting storage means 5, the defrosting operation drive means 6 starts operating, stops the rotation of the fan motor 16 for the outdoor heat exchanger, and at the same time stops the rotation of the fan motor 16 for the outdoor heat exchanger. Switch.

As a result, the refrigerant flow path of the four-way valve 9 is in the direction of the solid arrow, and the refrigerant discharged from the compressor 10 flows between the four-way valve 9 - the outdoor heat exchangers 7, 8 - the capillary throttling device 12.1.
The refrigerant flows through the path of 4-indoor heat exchanger 15-four-way valve 9 and returns to the compressor 10. therefore,
Defrosting is performed in the outdoor heat exchangers 7 and 8.

Further, when the detected value of the temperature detection means 1 is lower than the defrosting operation start setting temperature, the defrosting end determining means 4 determines the end of defrosting, and the determined content is stored in the defrosting information storage means 5. do.

The defrosting operation drive means 6 operates based on the defrosting end determination information stored in the defrosting information storage means 5, and ends the above-mentioned defrosting operation. Note that 11 and 13 in FIG. 3 are check valves.

[Problem that the invention seeks to solve]

In conventional defrosting devices for air conditioners with multiple outdoor heat exchangers, the temperature of the outdoor heat exchangers was detected only at one location, which caused problems such as differences in the conditions of the outdoor heat exchangers, and Due to variations in characteristics, there was a problem in that defrosting was not completed completely and residual frost remained.

This invention was made in the ninth attempt to solve this problem, and completely defrosts the heat exchanger in an air-made Japanese style fa that has multiple outdoor heat exchangers. The purpose is to obtain an air conditioner that can perform the following steps.

[Means for solving problems]

In the air conditioner according to the present invention, several outdoor heat exchangers are provided in one refrigeration cycle, and a temperature detection means is attached to each of the outdoor heat exchangers.

[Effect]

In this invention, the temperature is detected individually by the temperature detection means provided for each outdoor heat exchanger, and when any one of the outdoor heat exchangers falls below the defrosting operation start temperature. When the temperature of all the outdoor heat exchangers reaches or exceeds the defrosting operation end set temperature, the defrosting operation is terminated.

〔Example〕

Embodiments of the air conditioner according to the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing the configuration of one embodiment.

In FIG. 1, parts that are the same as those in FIG. 3 are given the same reference numerals, and a description of the structure thereof will be omitted, and only parts that are different from those in FIG. 3 will be described.

As is clear from comparing Figure 1 with Figure 3,
In the figure, temperature detection means 1 and 2 are attached to each outdoor heat exchanger 7 and 8, respectively.
The detection output of the defrosting start determining means 3 and the defrosting end determining means 4
It is designed to output to . The other configurations are the same as in FIG. 3.

Next, the operation will be explained. During heating, as is clear from Fig. 1, the temperature detection means 1.2 detects the evaporation temperature of the outdoor heat exchanger 7.8, which acts as an evaporator, and the defrosting temperature is determined based on these values. The start determining means 3 and the defrosting end determining means 4 output a defrosting start signal and a defrosting end signal.

The defrost start signal is output when either of the outdoor heat exchangers 7 and 8 becomes lower than the defrost start set value. Also,
The defrosting end signal is output when both the outdoor heat exchangers 7 and 8 become higher than the defrosting end setting. Whether or not it is stored is stored, and a defrosting raw signal is sent to the defrosting operation drive means 6. The defrosting operation driving means 6 controls the four-way valve 9 and the fan 16 to perform the defrosting operation.

FIG. 2 shows specific circuits of the parts 1 to 6 in the embodiment of FIG. 1. In FIG. 2, the temperature detection means 1 has a resistor 21 and thermistor 22 connected in series between the power supply and the ground, and the temperature detection means 2 has a resistor 23 and thermistor 24 connected in series.
between the power supply and ground.

It consists of connected columns.

The connection point between the resistor 21 and thermistor 22 of the temperature detection means 1 is connected to the non-inverting input terminal of the voltage comparator 33 of the defrosting start determining means 3 and the inverting input terminal of the voltage comparator 35 of the defrosting end determining means 4. ing.

Further, the connection point between the resistor 23 and thermistor 24 of the temperature detection means 2 is connected to the non-inverting input terminal of the voltage comparator 34 and the voltage comparator 3
It is connected to the inverting input terminal of 6.

The defrosting start determining means 3 includes voltage comparators 33 and 34 and a resistor 2.
Resistors 25 and 26, 27, and 28F'i are connected in series between the W source and the ground, respectively.

The connection point between resistors 25 and 26 is connected to the inverting input terminal of voltage comparator 330, and the connection point between resistors 27 and 28 is connected to the inverting input terminal of voltage comparator 34! ! It is continued. Both voltage comparators 3
The output terminal of 3.34 is connected to the first input terminal of the NOR circuit 39 of the defrosting information storage means 5 via the OR circuit 37t.

Similarly, the defrosting end determining means 4 uses the voltage comparator 35.
36, resistors 29 to 32, and an AND circuit 38. Resistors 29 and 30, 31 and 32 are connected in series between the power supply and ground, respectively.

A connection point between resistors 29 and 30 is connected to a non-inverting input terminal of a voltage comparator 35. A connection point between resistors 31 and 32 is connected to a non-inverting input terminal of voltage comparator 36. The output terminals of both voltage comparators 35 and 36 are connected to an AND circuit 38. The output terminal of the AND circuit 38 is connected to the second input terminal of the NOf'1 circuit 40 of the defrosting information storage means 5.

This defrosting information storage means 5 is composed of NOR circuits 39 and 40, the output terminal of the NOR circuit 39 is connected to the first input terminal of the NOR circuit 40, and the output terminal of the NOR circuit 40 is connected to the first input terminal of the NOR circuit 40.
It is connected to the second input terminal of the OR circuit 34.

The output terminal of the NOR circuit 40 is connected to the base of the transistor 430 via the resistor 41 of the defrosting operation driving means 5. The conductor of transistor 43 is grounded through resistor 42'II-, and its emitter is directly grounded. The collector of the transistor 43 is connected through a parallel circuit of a relay 44 and a diode 45. Depending on the opening and closing of the contacts 44 & of the relay 44, the fan 16 shown in FIG.
operation and switching of the four-way valve 9.

Next, the operation will be explained. The thermistors 22 and 24 of the temperature detection means 1.2 detect the temperatures of the outdoor heat exchangers 7 and 8, respectively, and the detection outputs are sent to the comparators 33 and 34, respectively, to the resistors 25 and 8 in the defrosting start determining means 3. 26.2
7 and 28 to determine whether or not the partial pressure has become lower than the reference value, that is, the set temperature for starting the defrosting operation.

Similarly, in the defrosting end determining means 4, the comparator 35
．． At 36, the detected outputs of the thermistors 22 and 24 are compared with the reference value divided by the resistors 29 and 30, 31 and 32, that is, the defrosting operation end set temperature.

If the comparison result of any one of the comparators 33 and 34 of the defrosting start determining means 3 is below the defrosting operation start setting temperature, the output of at least one of the comparators 33 and 34 becomes OR.
NOR circuit 39 of defrosting information storage means 5 via circuit 37t''
is input. This defrosting information storage means 5 is a NOR circuit 3
9,40 constitute a 7 lip-flop circuit, υ, O.
The output of the R circuit 37 is stored.

The output of the defrosting information storage means 5 is applied to the base of the transistor 43 of the defrosting operation driving means 6, the transistor 43 is turned on, the relay 44 is energized, the contact 44m is switched, and the four-way valve 9 is turned on. The defrosting operation described above is performed by switching and stopping the fan 16.

Also, in the defrosting end determining means 4, the server star 22.
When the comparators 35 and 36 determine that both of the detection outputs of 24 have exceeded the defrosting operation end set temperature, an output is output from the AND circuit 38, and this output turns off the transistor 43, which turns off the relay 44. is deenergized, the contact 44*f is opened, the fan 16 is operated, and the four-way valve 9 is switched to the normal heating operation, thereby ending the defrosting operation.

Although the above embodiment is an example in which one refrigeration cycle has two outdoor heat exchangers, the same thing can be said even if three or more outdoor heat exchangers are used.

Further, although the above embodiments have been described with respect to an example of an air conditioner, the same can be said of a refrigeration system.

〔Effect of the invention〕

As explained above, this invention starts defrosting operation when the detected temperature of any one of the plurality of outdoor heat exchangers falls below the defrosting operation start temperature, and The defrosting operation is performed so that the defrosting operation ends when all temperatures exceed the defrosting operation end setting temperature.
Complete defrosting effect can be obtained. Therefore, there is no possibility that frost buildup progresses and the capacity decreases, unlike in the conventional case where the dehazing process ends with residual frost partially present.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the air conditioner of the present invention, FIG. 2 is a circuit diagram showing the specific configuration of the main parts of the air conditioner shown in FIG. 1, and FIG. 3 is a conventional one. It is a block diagram showing the composition of air conditioning i#crIt of. 1.2...Temperature detection means, 3...Contract start determining means, 4...Defrosting end determining means, 5...VFI removal information storage means, 6...Deboxing rotation drive means, 7, 8... Outdoor heat exchanger, 9... Four-way valve, 10... Compressor?
, 12.14... Capillary throttling device, 15... Indoor heat exchanger, 16... Fan. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] In an air conditioner in which a compressor, a four-way valve, a plurality of outdoor heat exchangers, a throttling device, and an indoor heat exchanger are connected in a ring to form a refrigeration cycle, each of the plurality of outdoor heat exchangers is Temperature detection means for detecting temperature, defrost start determining means for starting defrost operation when at least one detected temperature of the temperature detection means becomes equal to or lower than the defrost operation start temperature, and all of the detection outputs of the above-mentioned temperature detection means. a defrosting termination determining means for terminating the defrosting operation when the temperature exceeds the defrosting operation termination set temperature; An air conditioner comprising a defrosting operation driving means that operates a fan and switches a four-way valve to heating when the frosting operation ends.