JPS5933965Y2 - air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioner, and particularly to a connection structure between a cooling pipe of an evaporator and a branch pipe of a flow divider.

Conventionally, in air conditioners, during cooling operation, refrigerant from the refrigerant piping is supplied in a divided manner to the cooling pipe of the evaporator via a large number of dividing pipes using a flow divider to exchange heat with the air passing through the evaporator. It is known to be efficient.

The connection piping between the diverter pipe and the cooling pipe of the evaporator is limited to a narrow space on the side of the evaporator inside the casing, and due to this space restriction, when connecting the diverter pipe to the cooling pipe, Furthermore, since the branch pipe is bent with an extremely small bending radius near the connecting end of the cooling pipe and then its tip is connected to the cooling pipe, a branch pipe with a small diameter is used.

However, conventionally, such a branch pipe with a small diameter has been connected by directly inserting it into the cooling pipe of the evaporator, so that when the refrigerant in the branch pipe flows into the cooling pipe, it expands and is ejected.
A phenomenon similar to that of a tapered nozzle occurs, and a steady pressure wave due to expansion propagates inside the cooling pipe, resulting in abnormal noise, especially a rattling noise (4000-10000Hz sound), which becomes a noise source. was.

The present invention was made in view of the above points, and it is possible to connect the flow divider pipe of the flow divider to the cooling pipe of the evaporator without directly connecting it to the cooling pipe of the evaporator.
By connecting through a shaped pipe, the steady pressure waves are reflected and interfered with each other at the bent part of the L-shaped pipe, and pressure fluctuations are quickly attenuated, thereby reducing the sound of refrigerant passing during cooling operation. The purpose of this invention is to effectively prevent the occurrence of (churchuru sound).

To achieve this objective, the configuration of the present invention is to provide an air conditioner in which the refrigerant from the refrigerant piping is supplied in a divided manner to the cooling pipe of the evaporator via the dividing pipe using a flow divider, which is almost the same as the cooling pipe. One end of the L-shaped pipe with a pipe diameter is connected to the cooling pipe, while the other end of the pipe is connected to the cooling pipe so that the open end of the branch pipe is located upstream of the bending part of the pipe. The steady pressure wave generated by the expansion and jetting of the refrigerant from the open end is connected to the branch pipe, and the steady pressure wave generated by the expansion and jetting of the refrigerant from the open end is connected to the bent part of the above-mentioned pipe and the open end of the branch pipe. The length is set so that the reflected waves interfere with each other.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 shows an indoor unit (A) of a separate air conditioner according to an embodiment of the present invention, in which 1 is a casing, a suction port 2 is provided at the center of the front surface of the casing 1, and a suction port 2 is provided at the lower front surface of the casing 1. A blowout port 3 is provided (below the suction port 2).

An evaporator 4 made of a cross-fin coil is disposed in the casing 1 facing the suction port 2, and a cross-flow fan 5 is disposed downstream of the evaporator 4 to draw air from the suction port 2. After the air is cooled by an evaporator 4, it is configured to be blown out from an outlet 3 by a cross flow fan 5.

Further, as shown in FIGS. 2 and 3, the evaporator 4 includes a large number of cooling pipes 7, 7 (for example, pipe diameters, The inner diameter of is 9.5
rranf3) and a large number of fins 8, 8, etc., which are fitted and supported by the cooling pipes 7, and heat is generated between the refrigerant flowing through the cooling pipe 7 and the air passing between the fins 8, 8. It performs an exchange action.

Note that 9 is a U-shaped connecting pipe. On the other hand, 10 is a source side refrigerant pipe for connecting to an outdoor unit (not shown),
As shown in FIGS. 2 and 3, a flow divider 12 is connected to the other end of the refrigerant pipe 10 via a capillary tube 18 as an expansion mechanism and an inlet pipe 11. (5 in this embodiment) branch pipes 13.
13... are branched, and the other end of each flow pipe 13 is connected to each inlet of the cooling pipe 7 of the evaporator 4 via an L-made pipe 14 having approximately the same pipe diameter as the cooling pipe 7, The refrigerant pipe 10 is provided so that the refrigerant is diverted to each of the branch pipes 13, 13, .

That is, in the past, the branch pipe was bent at a right angle at this L-shaped pipe part, but in this example, the L-shaped pipe 14 is provided, so the branch pipe 13 is bent at this part. There is no need to bend the refrigerant with a certain bending radius, which allows the refrigerant to flow smoothly.

Note that the curved pipe 14 has a horizontal length x in FIG. 4, for example.
= 50 rrrm, vertically placed y = 22 rrrm, radius z = 12.5 mm, and the insertion dimension of the branch pipe 13 is w = 20 rrrm.

Further, each outlet of the cooling pipe 7 is connected to a gas side refrigerant pipe 16 via a header 15, and communicated with an outdoor unit (not shown).

One end of the L-shaped pipe 14 is connected to the cooling pipe 7, while the other end of the L-shaped pipe 14 is connected to the opening of the branch pipe 13 on the upstream side of the bent portion 14a of the L-shaped pipe 14. It is connected to the branch pipe 13 so that the end is located, and the length x-
w) is set to a length such that a steady pressure wave generated by expansion and jetting of the refrigerant from the opening end and a reflected wave from the steady pressure wave reflected at the bending portion 14a interfere with each other.

Further, from the connection part between the branch pipe 13 and the L pipe 14,
As shown in FIG. 4, a sound absorbing material 17 is wrapped around the portion of the pipe 14 that reaches the bent portion 14a, and is provided to absorb sound emitted from the portion. There is.

Therefore, in the above embodiment, during cooling operation, the refrigerant in the branch pipe 13 separated by the flow divider 12 flows smoothly in the branch pipe 13, and passes through the L-made pipe 14 to the cooling pipe 7 of the evaporator 4. However, since the refrigerant pipe 14 is formed to have approximately the same diameter as the cooling pipe I, that is, a larger pipe diameter than the branch pipe 13, the refrigerant in the branch pipe 13, which has a smaller diameter, flows into the L pipe 14. When flowing into the water, it expands and ejects, resulting in a steady pressure wave as shown by the solid line in Figure 4.

However, after this steady pressure wave advances inside the L-shaped bone 14, it is reflected at the bent part 14a of the pipe 14, and a reflected wave as shown by the broken line in FIG. 4 is generated, and the wave interferes with the reflected wave. Therefore, the pressure fluctuations described above are quickly attenuated, and a steady pressure wave does not propagate to the cooling pipe 7 as in the conventional case.

Therefore, generation of refrigerant passing sound (churchuru sound) during cooling operation can be prevented.

Moreover, by wrapping the sound-absorbing material 17 (for example, coal tape) around the portion of the pipe-making 140 from the connecting portion with the branch pipe 13 to the bent portion 14a, the sound caused by the pressure fluctuation is radiated. Since the noise can be absorbed, the noise can be further reduced.

Now, specifically, in the case where the flow divider pipe of the flow divider is connected to the cooling pipe of the evaporator via an L-shaped pipe as in the above embodiment (this example)
Noise measurements were made during cooling operation for both cases: and when the branch pipe was directly connected to the cooling pipe (conventional example), and the results are shown in FIG.

As is clear from FIG. 5, the noise of the present invention shown by the broken line is about 2 to 3 dB lower in the frequency range of 4000 to 10000 Hz, which is the frequency range of the rattling sound, compared to the conventional example shown by the solid line. It can be seen that the sound (refrigerant passing sound) can be reduced.

In the above embodiment, the L-shaped pipe 14 was made separate from the cooling pipe 7, but the L-shaped pipe 14 was formed integrally with the cooling pipe 7 by bending the input end of the cooling pipe 70 at a right angle. Of course, you can.

In addition to the L pipe 14 bent at a right angle as in the above embodiment, it may also be bent at an acute angle or an obtuse angle. Anything that can be played is fine.

As explained above, according to the present invention, the refrigerant from the refrigerant pipes 10 is supplied to the cooling pipes 7 of the evaporator 4 in a divided manner by the flow divider 12 through the flow pipes 13. In the harmonizer, one end of an L-shaped tube 14 having approximately the same diameter as the cooling tube 7 is communicated with the cooling tube 7, while the other end of the L-shaped tube 14 is connected to the bent portion 14a of the tube-shaped tube 14. The branch pipe 13 is connected to the branch pipe 13 so that the open end of the branch pipe 13 is located on the upstream side, and the connection is made between the bent portion 14a of the pipe-making pipe 14 and the open end of the branch pipe 13 from the open end. By setting the length so that the steady pressure wave generated by the expansion and jetting of the refrigerant and the reflected wave reflected by the steady pressure wave at the bending part 14a interfere with each other, the refrigerant passing sound (churchuru sound) during cooling operation is reduced. ) can be effectively reduced, and noise can be reduced.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is an overall schematic perspective view, Fig. 2 is a side view of the main parts, Fig. 3 is a plan view of the same, Fig. 4 is a schematic illustration, and Fig. 5 is a noise diagram. It is a measurement result diagram. 4...Evaporator, 7...Cooling pipe, 10.
・・・・・・Source side refrigerant piping, 12 ・・・・Flow divider, 1
3... Branch pipe, 14... L-shaped pipe, 14
a...Bent part.

Claims (1)

[Scope of utility model registration request] The refrigerant from the refrigerant pipe 10 is transferred to the flow divider 13 by the flow divider 12.
In an air conditioner in which a branched flow is supplied to the cooling pipe T of the evaporator 4 via the On the other hand, the other end of the pipe 14 is connected to the branch pipe 13 such that the open end of the branch pipe 13 is located upstream of the bent portion 14a of the pipe 14, and A steady pressure wave is generated between the bent portion 14a of the pipe-making 14 and the open end of the branch pipe 13 due to expansion and jetting of the refrigerant from the open end, and the steady pressure wave is reflected at the bent portion 14a. An air conditioner characterized by having a length set so that reflected waves interfere with each other.