JPS6111573A - Outdoor machine for air conditioner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] <Technical Field of the Invention> The present invention provides an air conditioner capable of cooling and heating operation by switching the refrigerant circulation path, in which one outdoor unit can operate two indoor units simultaneously or individually. Related to the outdoor unit defrost mechanism of air conditioners operated in

<Prior art> As shown in FIG. 5, a conventional air conditioner of this type connects one heat exchanger 2 of an outdoor unit 1 to two indoor units 813a and 3b.
Two refrigerant circuits A and B circulate through the heat exchanger 2.
The indoor units 3a and 3b are operated simultaneously or individually by circulating the refrigerant through the refrigerant circuits A and B.

Refrigerant circuits A and B have four-way valves 4a and 4b, respectively.

Compressors 5a, 5b, accumulators 6a, 6b.

The piping is equipped with throttle devices 7a and 7b, and the four-way valve 4
．． a, I41. By switching the refrigerant circulation route with the operation b, cooling or heating operation is possible.

Then, during heating operation 11h, frost adhered to the heat exchanger 2 and -C
In order to prevent the operating efficiency from decreasing, the throttle device N7a
, 7b and the heat exchanger 2, as shown in Fig. 6, install the defrost pipes 4J-9a and 9b, respectively. ” @ When covered, the defrost Hinleys 9a and 9b sense 1flA degrees, activate the defrost control circuit, switch the four-way valves 4a and 4b, reverse the refrigerant circulation path, and operate the air conditioner to cool the heat exchanger. 2. Thaw the frost that has formed, and once the frost has cleared, perform the heating operation again.

The defrost control circuit that switches the four-way valves 4a and 4b [, 1 shown in Figure 7ffJ: There are two circuits! When the auxiliary relays 10a and 10b, which are configured in the 1f column -(d3, receives a heating command from the indoor lNs 5a and 3b) operate f1, ?1
11 Auxiliary relay 10ε>, 10b each contact 10G
, 10d closes and the heating operation starts. 3. (frost has formed on the heat exchanger 2) Then, the defrost sensor--9a,
9b senses this temperature and defrost control section 118.11b
Contacts 12c and 12d of auxiliary relays 12a and 12b are opened, and contacts 13G and 13d of 138.13b are activated to operate the four-way valve 4a.

4b is turned FF to switch to cooling (reverse) operation, defrost the heat exchanger 2, and turn on the defrost lens 9 until the frost is removed.
a, 9b detects the hot stone in the pipes 8a, 8b, and the defrost control section 118.11b operates in the opposite direction as described above to open the four-way valves 4a, 4.
The heating operation is performed again by turning on b.

This defrost control circuit is designed so that even if either one of the outdoor units 3a and 3b is operated and frost occurs on the heat exchanger 2, both circuits will defrost.

In addition, 14 is a terminal board for connecting indoor units 3a, 3b, etc.
is the blower of the heat exchanger 2 of the outdoor unit 1.

Since the air conditioner is configured in this way, defroster sensors 9a, 9b and auxiliary relay 10a.

10b, 12a, 12b, 13a, 13b, and two defrost control units 11a and 11b are required, and there are four units. Moreover, since these are the same parts, they can be mistaken for high quality products.

There is a problem in terms of reliability t'l.)3゜〈Second main points of the invention〉 The present invention has been made in view of the above Ij, and is based on a single frost that detects the thirst 1α of the heat exchanger. An intake sensor is installed between the heat exchanger and the throttling device of each refrigerant circuit.
Our goal is to provide a low-cost, high-quality outdoor unit for air conditioners by installing a single defrost control circuit that switches the refrigerant circulation path based on a signal from the defrost sensor. C
An embodiment of the invention is also shown in FIGS. 1 to 4.

In the figures, -b of the same elements as in FIGS. 5 to 7 are indicated by the same reference numerals.

The outdoor area 1 has one heat exchanger 21 as in the conventional example.
3I i is equipped with refrigerant circuits A and B that circulate through two indoor units 3a and 3b, and this refrigerant circuit △.

B (, L respectively four-way valve /1a, /lb, compression m5a
.

5b, Aki-l Mouretaro a, 6b, diaphragm PI 7
a.

7b is provided.

Then, pipes 8a and 3b between the throttle sections 7a and 7b and the heat exchanger 2 are arranged in parallel by welding or the like so that they are in contact with each other, so that two pipes 8a and 8b are formed as shown in FIG. Recess 15
1 for defrosting? 16 is number 1]. To install this defrost sensor 16, as shown in FIG.
＼Even if it is installed inside Ruder 17, it will not work.

Even if the defrost sensor 16 is installed in this way, when the two indoor units 3a and 3b are operated at the same time, the temperatures of the refrigerant circuits A and B will differ slightly, but there will be no frost in the heat exchanger 2. Since the temperature of piping 8a and 8b decreases significantly when it is closed, a slight temperature difference is not a problem.If only one side is covered during operation,
Although the temperature difference between 8b and 8b is large, the piping where the refrigerant is circulating has a high thermal conductivity, so it is necessary to use the frost mounting t? N”no 16
The mounting portion of the defrost sensor 16 can accurately sense and cover the temperature because the temperature of the piping that is stopped is negligible, that is, the temperature of the piping of the circuit that is in operation is warm. C'A3) Weld the holder 17 to the recess 15).
L.
Can prevent attrition.

The defrost system FI11 circuit t, which switches the refrigerant circulation path, is the 4141st circuit of the defrost sensor 16. As shown in Figure 1, the indoor units 3a and 3bJ receive the heating command, and the auxiliary relay 18, which operates, receives the signal from the defrost sensor 16, and the auxiliary relay 19, which operates. The defrost control unit 20 receives a command from the defrost control unit 20, and the four-way valve 4
It is a single system circuit equipped with an auxiliary relay 21.

The operation of this defrost control circuit is such that when the indoor units 3a, 3bJ receive a heating command and the auxiliary relay 18 is activated, the contact 18a of the auxiliary relay 18 is closed. The heating system is running loudly. Then, as frost builds up on the heat exchanger 2 and the temperature of the arrangement 8a and 8b becomes low -F, the defrost sensor 16 senses this dI condition and the defrost controller 20 The contact 19a of the auxiliary relay 19 is closed, and the contact 21a of the four-way valve operation auxiliary relay 21 is activated, turning the four-way valves 4a and 4b into
[[The cooling (reverse) operation starts, the heat exchanger 2 is defrosted, and when the frost is removed, the defrost sensor 16 senses the temperature, and the defrost controller 20 operates in the opposite manner to the above. The four-way valves 4a and 4b are turned ON and the heating operation is performed again.

<Effects of the Invention> The present invention provides the above J: Sea urchin, sensing the temperature of the heat exchanger 1
One system of defrost control circuit is installed which switches the refrigerant circulation route according to the signal from the defrost sensor. Since it is easy to yell, it is possible to reduce the amount of noise.

[Brief explanation of drawings]

Fig. 1 is a refrigerant circuit diagram showing an embodiment of the air conditioner according to the present invention, Fig. 2 is a detailed diagram showing an embodiment of the defrost sensor 1 fee 1, and Fig. 3 is a defrost lens remover (- Fig. 4 is a circuit diagram of the defrost control circuit; Fig. 5 is a detailed diagram showing another embodiment of 1.
The figure is a refrigerant circuit diagram of a conventional air conditioner, Figure 6 is a detailed diagram of a conventional defrost sensor supplement, and Figure 7 is a circuit diagram of a conventional defrost control circuit. 2...Heat exchanger 3a, 3b...Indoor unit 4a, zlb...
・Four-way valve 5a, 5b...Compressor 6B, 6b・
...Aki-1 Mouret-a, 7b...Aperture section 8
a, 8b...1 pipe...recessed part 16...defrost sensor 1 no 17...cylindrical holder 18
．． 19... Auxiliary relay 20... Defrost control section 21
...Auxiliary relays A, B... Refrigerant circuit agent Masu Iwa IIB (2 idiots) Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Procedure amendment (self-initiated, 1977) October 30th, 2013 1. Indication of the incident: Patent Application No. 131263/1982 2.
Title of the invention Outdoor unit 3 of an air conditioner, relationship to the amended case Patent applicant address 2-2-3 Marunouchi, Chiyoda-ku, Tokyo Name (601,) Jinhachi Katayama, representative of Mitsubishi Electric Corporation Section 4 Agent 6, Contents of amendment (1) On page 6, line 17 of the specification, the phrase ``1 frost installation sensor'' is amended to read ``defrost removal sensor''. Q) Figure 7 of the drawings should be corrected as shown in the attached corrected drawings. 7. One or more copies of the revised catalog of attached documents

Claims (3)

[Claims] (1) One outdoor unit is equipped with one heat exchanger, two compressors, and two refrigerant circuits, and the two indoor units are operated simultaneously or individually, and the refrigerant circulation path is switched. In an air conditioner operating for cooling or heating, one defrost sensor for sensing the temperature of the heat exchanger is provided between the heat exchanger and the throttling device of each refrigerant circuit, and An outdoor unit of an air conditioner characterized by being provided with one defrost control circuit that switches a refrigerant circulation route in accordance with a signal. (2) The defrost sensor is installed in a recess formed by connecting and arranging piping between the heat exchanger and the throttling device of each refrigerant circuit in parallel. The outdoor unit of the air conditioner according to item 1. (3) The defrost sensor is installed in a cylindrical holder provided in a recess formed by connecting and arranging the pipes between the heat exchanger and the throttling device of each refrigerant circuit. An outdoor unit of an air conditioner according to claim 1.