JP2001255041A - Refrigeration system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exhibit a desired capacity of a refrigeration system by preventing the refrigerant passage of an orifice from being closed even if a brazing material flows to the joint of piping incorporating the orifice. SOLUTION: In a refrigeration system where the other refrigerant pipe 23 is inserted into one refrigerant pipe 21 and coupled therewith by brazing and an orifice 16 for controlling the refrigerant flow is provided in the proximity of the joint, a groove 25 for receiving the brazing material is made at a part on the brazing side of the orifice 16 along the inner surface of the refrigerant pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration system in which an orifice is provided in a refrigerant pipe connecting refrigeration equipment.

[0002]

2. Description of the Related Art A refrigerating apparatus in which an orifice is provided in a refrigerant pipe connecting refrigerating equipment is disclosed in Japanese Patent Laid-Open No. 7-1.
There is 39837 gazette. In the refrigeration apparatus disclosed in this publication, an orifice in the refrigerant pipe is fixed by a dowel provided in the refrigerant pipe.

In order to provide an orifice in a pipe, an orifice is inserted into one refrigerant pipe, and the other refrigerant pipe is brazed to the inserted portion to form a closed refrigeration cycle. Here, the brazing material flows into the gap between the two refrigerant pipes and seals the gap between the two refrigerant pipes. If the brazing material is too much, the brazing material reaches the orifice and the refrigerant passage of the orifice is formed. May be closed.

[0004] If the refrigerant passage of the orifice is closed by the brazing material, the refrigerant does not flow or becomes difficult to flow, and the desired performance of the refrigerating apparatus cannot be exhibited.

SUMMARY OF THE INVENTION It is an object of the present invention to make it difficult to close a refrigerant passage of an orifice even when a brazing material flows into a connection portion of a pipe in which an orifice is incorporated, thereby exhibiting a desired performance of a refrigeration system. is there.

[0006]

In order to achieve this object, the invention according to claim 1 connects a compressor, a condenser, a decompressor, and an evaporator with a refrigerant pipe to form a refrigeration cycle. In the refrigerating apparatus, the other refrigerant pipe is inserted into one of the refrigerant pipes and connected by brazing, and the orifice arranged near the connection part for controlling the flow of the refrigerant is provided. The side portion is provided with a groove for receiving the brazing material along the inner surface of the refrigerant pipe.

According to the first aspect of the present invention, the brazing material flowing into the pipe is guided to the groove, so that the passage of the refrigerant in the orifice is less likely to be blocked by the brazing material.

According to a second aspect of the present invention, a net for reducing refrigerant noise is arranged on the side of the orifice of the first aspect opposite to the brazing side portion. Therefore, according to the second aspect of the invention, the refrigerant noise can be reliably reduced by the orifice and the net.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a multi-type air conditioner (refrigeration apparatus) in which a plurality of indoor units 3a, 3b,... Are connected in parallel to one outdoor unit 2 by refrigerant pipes.

In the outdoor unit 2, 4 is a variable capacity compressor and 5 is a rated (constant capacity) compressor, which is connected in parallel.

Reference numeral 6 denotes a four-way valve, which is in a solid line state during cooling operation.
During the heating operation, each is set to a broken line state.

The refrigerant discharged from the compressors 4 and 5 flows in a solid arrow state during the cooling operation, and flows in a broken line state during the heating operation.

Reference numeral 7 denotes an outdoor heat exchanger which is arranged in parallel. This outdoor heat exchanger 7 serves as a condenser during cooling operation.
At the time of heating operation, each acts as an evaporator. 8 is a receiver tank. Reference numeral 9 denotes an accumulator to which suction pipes 10 of the two compressors 4 and 5 are connected.

On the other hand, the indoor unit 3a is of a ceiling-embedded type as shown in FIG. 2, and has a body 11 in which a heat exchanger and a blower described later are incorporated, and a suction port attached to a lower portion of the body 11 And a decorative panel 12 on which a decorative panel is formed.

Reference numeral 13 denotes a discharge port, which is connected to a duct, the tip of which faces a ceiling or a wall surface of a room (not shown), and controls the temperature of room air sucked from a decorative panel in the airframe and circulates the room through the duct. .

Returning to FIG. 1, in the indoor unit 3a, 14 is a strainer, and 15 is a motor-operated expansion valve (decompressor), which is called an "motor-operated valve". Hereinafter, the electric expansion valve is referred to as an electric valve.

The valve opening of the motor-operated valve 15 is controlled by a pulse motor built in the motor-operated valve, and is fully opened at 480 pulses and fully closed at 0 pulses. The valve opening of the electric valve will be described later.

Reference numeral 16 denotes an orifice (to be described later), 17 denotes a flow divider incorporating a strainer 18, and 19 denotes an indoor heat exchanger, which functions as an evaporator during a cooling operation and as a condenser during a heating operation. Reference numeral 20 denotes a collecting pipe.

FIG. 3 is a sectional view of a pipe in which the orifice 16 is incorporated.
And a net 22 for reducing the refrigerant noise is provided at the outlet side.

Reference numeral 23 denotes the other refrigerant pipe.
Has an outer diameter substantially the same as the inner diameter of the refrigerant pipe, and is inserted into one of the refrigerant pipes 21, and the connection portion is brazed with the brazing material 24.

As shown in FIG. 4, the orifice 16 has a groove 25 formed on the upper outer periphery thereof. Therefore, the above-mentioned net 22 is arranged on the side opposite to the brazing side portion.

As described above, since the groove 25 is provided on the entire periphery of the portion on the brazing side of the orifice 16, for example, the brazing material 24 is transferred to the orifice 16 via the gap 26 between the refrigerant pipes 21 and 23. Even if it flows in, the raw material 2
4 accumulates in the groove 25 and the refrigerant passage 2 of the orifice 16
It is rare to block 7.

Since the equipment in the other indoor units 3b is the same as the equipment in the indoor unit 3a, the same reference numerals are given and the description is omitted.

In the multi-type air conditioner 1 having such a configuration, when all of the indoor units 3a, 3b... Are operated for heating, the electric valves 15 of the respective indoor units 3a, 3b. The opening degree is set according to the heating load.

On the other hand, in the outdoor unit 2, two compressors 4, 4 based on the total heating load of each indoor unit
5 is controlled. Thus, the indoor unit 3
The operating state of the outdoor unit 2 is controlled according to the heating loads a, 3b,.

Here, for example, when the heating load of only one indoor unit 3a is "0" (the other indoor unit 3a).
The heating load of b ... is not "0"), and the heating operation of this one indoor unit 3a is stopped.

More specifically, the operation of an indoor blower (not shown) is stopped, and the pulse motor of the motor-operated valve 15 is operated with a minimum number of pulses (for example, 70 to 80 pulses) so that the liquid refrigerant does not accumulate in the indoor heat exchanger 19. ). These 70 to 80 pulses are about 14 to 16% (7
0 to 80/480).

By the way, during normal heating, a pulse is set so that the supercooling of the condenser becomes a certain amount (for example, 115 pulses).
And its valve opening is about 23% (115/480)
It is about. That is, the valve opening of the electric valve 14a when the heating operation is stopped is set smaller than the valve opening during the heating operation.

The reason why the motor-operated valve 14a is set slightly open even when the heating operation is stopped is that even if condensed refrigerant is accumulated in the indoor heat exchanger 19 of the indoor unit 3a during the heating operation is stopped. This is because the accumulated refrigerant is returned to the outdoor unit 2 via the orifice 16 and the electric valve 15. According to this model, the amount of the condensed refrigerant that is about to accumulate was experimentally about 0.3 liter to 0.4 liter.

In other words, the refrigerant condensed in the indoor heat exchanger 19 during the stoppage of the heating operation of the indoor unit 3a returns to the outdoor unit 2 via the orifice 16 and the electric valve 15,
The refrigerant is prevented from accumulating in the indoor unit 3a during which the heating operation is stopped.

As a result, shortage of refrigerant (gas shortage) hardly occurs, and sufficient heating capacity can be obtained. The orifice 16 has two refrigerant pipes 21 and 23 as shown in FIG.
Since the groove 25 for receiving the brazing material 24 having entered the gap 26 is provided, the refrigerant passage 27 is hardly clogged with the brazing material 24, and the dimensions of the refrigerant passage 27 as designed are maintained. The refrigerant noise generated from the air can be extremely reduced.

During the cooling operation, since the state of the refrigerant near the orifice 16 is liquid, the refrigerant sound is less noticeable than during the heating operation.

In the above embodiment, the indoor unit 3a
Is a ceiling-embedded type as shown in FIG. 2, but the present invention is not limited to this, and so-called "4-way cassette", "2-way cassette", "high ceiling type", "built-in type" It can be applied to various indoor units such as "wall-mounted type" and "ceiling-hanging type".

[0034]

As described above, according to the first aspect of the invention, a compressor, a condenser, a decompressor, and an evaporator are connected by a refrigerant pipe to form a refrigeration cycle, and one refrigerant pipe is connected to the other refrigerant pipe. In the refrigerating apparatus, the refrigerant pipe is inserted and connected by brazing, and an orifice arranged near the connecting portion and controlling the flow of the refrigerant is provided. The receiving groove is provided along the inner surface of the refrigerant pipe.

Accordingly, the brazing material that has flowed into the piping for pipe connection is guided to the groove, so that the refrigerant flow in the orifice is less likely to be blocked by the brazing material, and the dimensions of the designed refrigerant passage are maintained.
Refrigerant noise generated near the orifice can be extremely reduced.

According to a second aspect of the present invention, a net for reducing refrigerant noise is arranged on the side opposite to the brazing side of the orifice according to the first aspect. Therefore, the refrigerant noise can be reliably reduced by the orifice and the net.

[Brief description of the drawings]

FIG. 1 is a refrigerant circuit diagram of a refrigeration apparatus of the present invention.

FIG. 2 is a side view showing the appearance of the indoor unit shown in FIG.

FIG. 3 is a sectional view of the orifice shown in FIG. 1;

FIG. 4 is a perspective view of the orifice.

[Explanation of symbols]

 4, 5 Compressor 7 Outdoor heat exchanger 15 Motorized valve 16 Orifice 19 Indoor heat exchanger 21 One refrigerant pipe 22 Net 23 Other refrigerant pipe 25 Groove

Claims (2)

[Claims] 1. A refrigerating cycle is formed by connecting a compressor, a condenser, a decompressor, and an evaporator with a refrigerant pipe, and another refrigerant pipe is inserted into one refrigerant pipe and connected by brazing, and In the refrigeration apparatus provided with an orifice arranged near the connection portion to control the flow of the refrigerant, a groove for receiving a brazing material is provided along the inner surface of the refrigerant pipe in the brazing side portion of the orifice. A refrigeration apparatus characterized by the following. 2. A refrigerating apparatus, wherein a net for reducing refrigerant noise is arranged on a side of the orifice opposite to the part on the brazing side.