JPH0979699A - Cooling system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress piping resonance sounds generated when a muffler for use in a cooling system for refrigerators and the like is provided, thereby effectively reducing noises generated from a refrigerator. SOLUTION: Both ends of a muffler 6 are reduced in diameter to be made substantially conical-shaped to form pipe connections 17, an inlet bent pipe portion 15a is provided on a cooling medium inlet pipe 15 of the muffler 6 for a cooling system, and an outlet bent pipe portion 16a is provided on a cooling medium outlet pipe 16, so that a cooling system is obtained, in which an increase in noises caused by piping resonance is suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling system for a refrigerator or the like, and more particularly to improvement of pipe resonance, oil return, etc. which are harmful when a muffler used for the purpose of reducing noise is installed. is there.

[0002]

2. Description of the Related Art In recent years, cooling systems such as refrigerators have become large in size, and the capacity of compressors has increased with the increase in heat absorption. Therefore, the cylinder volume of the compressor is increased and the noise is increased. In particular, noise caused by pressure pulsation of the refrigerant discharged from the compressor is increased, which is a problem.

Therefore, conventionally, for example, Japanese Unexamined Patent Publication No. 4-52.
There is proposed a structure in which a muffler is installed in a discharge refrigerant pipe in a refrigerant circuit of a cooling system as shown in Japanese Patent No. 482.

An example of a conventional cooling system will be described below with reference to FIG. 5 shows a refrigerant circuit diagram of the cooling system. In FIG. 5, 101 is a compressor, 102 is a condenser, 103 is a throttle part, 104 is an evaporator, 105 is an accumulator, and 106 is a compressor 101.
Is a refrigerant suction pipe, and 107 is a refrigerant discharge pipe. A muffler 108 is provided in the refrigerant discharge pipe.

The operation of the cooling system configured as described above will be described below. First, with the compression action of the refrigerant of the compressor 101, the refrigerant with pressure pulsation is discharged to the refrigerant discharge pipe 107. Next, this discharged refrigerant is guided to the muffler 108, and the pressure pulsation of the refrigerant is attenuated by the muffler 108.

As a result, the vibration transmitted to the cooling system body due to the discharge pressure pulsation, the vibration noise of the piping, etc. are reduced, and the cooling system noise is suppressed.

[0007]

However, in the above-described structure, by providing the muffler 108, pipe resonance occurs using the muffler as a mass and the refrigerant pipe connected to the muffler 108 as a spring, causing pressure pulsation of the refrigerant. However, there was a problem that a new noise source was generated due to the resonance of the pipes, which in turn increased the noise of the cooling system.

Further, there is a problem that the space of the muffler 108 serves as an oil trap and deteriorates oil return.

In view of the above problems, it is an object of the present invention to provide a cooling system that reduces pipe resonance noise caused by installing a muffler and improves oil return in the refrigerant circuit.

[0010]

In order to achieve the above object, the cooling system of the present invention comprises a compressor and a muffler provided in a refrigerant discharge pipe in a refrigerant circuit connected to the compressor. Both ends of the pipe are compressed to form a substantially conical pipe connection portion, and the refrigerant inlet pipe and the refrigerant outlet pipe of the cooling system muffler are formed of curved pipes.

As a result, the rigidity of the pipe system can be increased from both ends of the muffler, and a cooling system in which an increase in noise such as pipe resonance is suppressed can be obtained.

Further, the refrigerant outlet side of the muffler is located lower than the refrigerant inlet side and is inclined.

As a result, it is possible to obtain a cooling system which prevents deterioration of oil return when the muffler is installed.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention comprises a compressor and a muffler provided in a refrigerant discharge pipe in a refrigerant circuit connected to the compressor, and both ends of the muffler are compressed. The pipe is formed into a substantially conical pipe connection portion, and the refrigerant inlet pipe and the refrigerant outlet pipe of the cooling system muffler are composed of curved pipes, and a cross section 2 from both ends of the muffler to the refrigerant inlet pipe and the refrigerant outlet pipe. It has the effect of increasing the secondary moment and increasing the rigidity of the muffler and piping system.

According to a second aspect of the present invention, the refrigerant outlet side of the muffler is located lower than the refrigerant inlet side and is inclined, the oil trap is eliminated, and oil is mist-like from the refrigerant outlet pipe. It has the effect of sequentially circulating.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. (Embodiment 1) FIG. 1 shows a refrigerant circuit diagram. In FIG. 1, 1 is a compressor, 2 is a condenser, 3 is a throttle part, 4 is an evaporator,
5 is an accumulator, 6 is a muffler, and 7 is a heat dissipation capacitor. Reference numeral 8 is a refrigerant suction pipe connected to the compressor 1, and 9 is a refrigerant discharge pipe.

FIG. 2 is a plan view of the machine room. In FIG. 2, reference numeral 10 denotes a refrigerator main body, and the compressor 1, the accumulator 5, the muffler 6, and the like are provided in a machine room 11 defined at a rear bottom portion of the refrigerator main body 10. A heat radiating condenser 7, a refrigerant suction pipe 8 and a refrigerant discharge pipe 9 are installed.

Further, in the machine room 11, there are provided a blower 12 for forcibly cooling the heat radiation condenser 7 and an evaporation tray 13 for storing and evaporating drain water.

The refrigerant discharge pipe 9 reaches the evaporation dish 13 via the muffler 6, is once elastically supported by the supporting portion 14, is connected to the heat radiating capacitor 7, and is then embedded in the refrigerator body 10.

FIG. 3 is a perspective view of the muffler. In FIG. 3, reference numeral 15 is a refrigerant inlet pipe of the muffler 6, and the pipe is bent near the connection of the muffler 6 to form an inlet bent pipe portion 15a, and 16 is The refrigerant outlet pipe of the muffler 6 is bent like the inlet side to form an outlet bent pipe portion 16a.

Numeral 17 is a pipe connecting portion corresponding to both ends of the muffler 6. The pipe connecting portion 17 is contracted to have a substantially conical shape.

The arrows in the figure indicate the flow of the refrigerant. The operation of the cooling system configured as described above will be described below.

Due to the refrigerant compressing action of the compressor 1, the refrigerant suction pipe 8
As a result, the refrigerant sucked into the compressor 1 is compressed and discharged from the refrigerant discharge pipe 9 with pressure pulsation. After that, this compressed refrigerant is introduced into the muffler 6, and the pressure pulsation is attenuated. The refrigerant then passes through the pipe near the evaporation tray 13,
The refrigerator body 1 reaches the heat dissipation capacitor 7 and exchanges heat.
It is led to the refrigeration equipment buried in 0.

As a result, the transmission of the pressure pulsation of the refrigerant from the muffler 6 is attenuated, and the noise due to the vibration of the refrigerating equipment and the pipes using this as a vibration source is reduced.

Further, the pressure pulsation of the refrigerant is applied up to the muffler 6, but a substantially conical pipe connecting portion 17 located at both ends of the muffler 6 and an inlet bent pipe for connecting the inlet and outlet pipes in the vicinity thereof. Since it is composed of the portion 15a and the outlet bent pipe portion 16a, the second moment of area between the pipe connecting portion 17 and the inlet bent pipe portion 15a and the outlet bent pipe portion 16a of each connecting pipe increases, and the muffler 6 and The rigidity with the refrigerant discharge pipe 9 is dramatically increased.

As a result, an increase in pipe resonance noise generated when the muffler is installed is suppressed.

(Embodiment 2) The same components as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

In FIG. 2, 19 indicates a floor surface. 4 shows a perspective view of the muffler, and in FIG. 4, 18 shows a horizontal line parallel to the floor surface 19, and the muffler 6 is inclined at an inclination angle 20 toward the refrigerant outlet pipe 16 side of the muffler 6. The inclination angle 20 is 0 degree or more and 180 degrees or less. Reference numeral 21 represents mist-like oil contained in the refrigerant introduced to the muffler 6, 22 is oil stored in the muffler 6, and 23 is mist-like oil discharged from the muffler 6 carried by the refrigerant. .

The arrows in the figure show the refrigerant flow. The operation of the cooling system configured as described above will be described below.

The compressed refrigerant introduced into the muffler 6 through the refrigerant inlet pipe 15 contains a lot of mist-like oil 21. The oil 21 collides with the inner wall of the muffler 6 and is accumulated from the inner wall to the lower part of the muffler 6 due to gravity to become a stored oil 22.

However, since the muffler 6 is inclined toward the outlet side, the stored oil 22 is biased toward the outlet side of the muffler 6 and is entrained in the refrigerant flow near the refrigerant outlet of the muffler 6 to become a mist again. Is discharged from the muffler 6.

As a result, smooth oil discharge is achieved,
Since most of the oil is discharged from the muffler 6,
It is possible to secure the sound deadening effect of the muffler, prevent backflow of oil, and improve oil return.

[0033]

As described above, according to the present invention, a compressor,
It consists of a muffler provided in the refrigerant discharge pipe in the refrigerant circuit connected to the compressor, forming a substantially conical pipe connection part where both ends of this muffler are contracted, and with the refrigerant inlet pipe of the cooling system muffler. By configuring the refrigerant outlet pipe with a curved pipe, it is possible to suppress an increase in noise due to pipe resonance.

Further, since the refrigerant outlet side of the muffler is located lower than the refrigerant inlet side and is inclined, an oil trap in the muffler can be prevented and oil return can be improved.

As a result, it is possible to reduce pipe resonance noise, which is a harmful effect when the muffler is installed, and improve oil return, and it is possible to effectively reduce noise of the cooling system without deteriorating reliability.

[Brief description of drawings]

FIG. 1 is a refrigerant circuit diagram of a cooling system showing a first embodiment of the present invention.

FIG. 2 is a plan view of a machine room of the cooling system.

FIG. 3 is a perspective view of a muffler of the cooling system.

FIG. 4 is a perspective view of a muffler of a cooling system showing a second embodiment of the present invention.

FIG. 5 is a refrigerant circuit diagram of a conventional cooling system.

[Explanation of symbols]

 1 Compressor 6 Muffler 9 Refrigerant discharge pipe 10 Refrigerator body 15 Refrigerant inlet pipe 15a Inlet curved pipe portion 16 Refrigerant outlet pipe 16a Outlet curved pipe portion 17 Pipe connecting portion 20 Inclination angle

Claims (2)

[Claims] 1. A compressor, and a muffler provided in a refrigerant discharge pipe in a refrigerant circuit connected to the compressor, wherein both ends of the muffler form a substantially conical pipe connecting portion with a reduced pipe, Further, the cooling system is characterized in that the refrigerant inlet pipe and the refrigerant outlet pipe of the cooling system muffler are composed of curved pipes. 2. The cooling system according to claim 1, wherein the refrigerant outlet side of the muffler is located lower than the refrigerant inlet side and is inclined.