JPH05126045A - Hermetic type compressor - Google Patents

Abstract

PURPOSE:To provide a hermetic type compressor used for refrigerators, air- conditioners and the like, which reduces pulsation caused by the blow back of intake refrigerant and is thereby less in oscillation and noise. CONSTITUTION:A device is made up of a suction chamber 7, a discharge chamber 8, a valve plate 11, a suction port 12 bored in the valve plate, a rectifier tube 30 bored through a discharge port 13, a baffle 21, a resonance chamber 23 and a baffle, and of a tapered duct 31 for the suction chamber, which has a large open end 32 and a small open end 33.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic compressor used in refrigerators, air conditioners and the like.

[0002]

2. Description of the Related Art In recent years, hermetic compressors (hereinafter referred to as compressors) are required to have high efficiency and low noise.

An example of a conventional compressor will be described below with reference to the drawings. 3 and 4 are disclosed in JP-A-1-375.
This is the compressor shown in Japanese Patent Publication No. 96.

Reference numeral 1 is a closed container, 2 is a compression element elastically supported in the closed container 1, and 3 is an electric element disposed above the compression element. Reference numeral 4 is a stator, and 5 is a rotor, which constitutes the electric element 3. 6 is a cylinder head having a suction chamber 7 and a discharge chamber 8, 9 is a cylinder block having a cylinder 10, 11 is a suction hole 12 and a discharge hole 1.
3 is a valve plate, 14 is a suction lead, 15 is a piston, 16 is a crankshaft, 17 is a connecting rod connected to an eccentric portion 18 of the crankshaft, 19 is a suction muffler having a communication pipe 20, 21 Is a baffle that divides the suction muffler 19 into an expansion chamber 22 and a resonance chamber 23, and constitutes the compression element 2.

In the above structure, the low-temperature low-pressure refrigerant gas returned from the refrigeration cycle (not shown) is sucked into the suction pipe (not shown), the suction muffler 18, the suction chamber 7, and the suction hole 12. Then, the suction lead 14 is opened and guided to the cylinder 10.

The refrigerant gas compressed by the compression element 3 and having a high temperature and high pressure is introduced into a refrigeration cycle (not shown) through a discharge line (not shown) and a discharge pipe (not shown). There is.

[0007]

However, in the above-mentioned structure, since the suction lead 14 opened at the time of starting the compression is not completely closed at the start of compression, a part of the refrigerant gas sucked into the cylinder 10 is the above-mentioned. It is pushed back (blown back) to the suction hole 12, the suction chamber 7, and the suction muffler 19, which causes pulsation in the suction system.

This pulsation is transmitted to the evaporator (not shown) of the refrigeration cycle and vibrates to cause noise.

In view of the above problems, the present invention provides a compressor that damps pulsation due to blowback and reduces vibration and noise of an evaporator in a refrigeration cycle.

[0010]

In order to solve the above problems, a compressor according to the present invention has a suction muffler having a suction chamber conduit, one end of which communicates with a suction chamber, and the suction muffler is expanded. A baffle for partitioning the chamber into a resonance chamber and a rectifying tube penetrating the baffle, one end of the rectifying tube on the resonance chamber side is close to the large opening end of the suction chamber conduit, and the small opening end of the suction chamber conduit is The structure is provided in the vicinity of the suction hole of the valve plate that forms the suction chamber.

[0011]

According to the present invention, the refrigerant gas rectified by the rectifying pipe is guided from the large opening end of the suction chamber conduit to the small opening end while increasing the flow velocity for stable suction without generation of vortex flow. Since the blow-back refrigerant gas in the compression process is opened to the large opening end while gradually reducing the flow velocity from the small opening end of the suction chamber conduit, the pulsation effect of the refrigerant gas due to the blow-back to the rectifying pipe is attenuated. Become.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the compressor according to the present invention will be described below with reference to the drawings. It should be noted that the same components as those of the related art will be denoted by the same reference numerals and detailed description thereof will be omitted. FIG. 1 is a vertical sectional view of a compressor according to the present invention, and FIG. 2 is a sectional view of an essential part of FIG.

In FIG. 1, 30 is a straightening pipe and 31 is a suction chamber conduit having a tapered shape. 32 is a suction chamber conduit 31
The large opening end 33 is a small opening end, the large opening end 32 is open to the resonance chamber 23, and the small opening end 33 is open to the suction chamber 7.

In the above structure, the low-temperature low-pressure refrigerant gas returned from the refrigeration cycle (not shown) passes through the suction pipe (not shown), the suction muffler 19, the suction chamber 7, and the suction hole 12, Open suction lead 14 to cylinder 10
Be led to. The high-temperature high-pressure refrigerant gas compressed by the compression element 3 passes through a discharge line (not shown) and a discharge pipe (not shown) and is guided to a refrigeration cycle (not shown).

In the compressor having such a structure,
At the time of suction, the flow of the refrigerant gas is rectified by the rectifying pipe 30, and flows from the large opening end 32 of the suction chamber conduit 31 to the small opening end 33 while gradually increasing the flow velocity. Inhalation chamber conduit 3
Since 1 is a tapered shape, the flow velocity in the suction chamber conduit 31 is slow near the large opening end 32 and fast near the small opening end 33. When the suction process is finished and the compression process is started, the suction lead 14 is not completely closed, and is sucked into the suction chamber 7.
Push back some of the refrigerant gas being compressed. The flow of the refrigerant gas is blown back to the large opening end 32 while decreasing the flow velocity from the small opening end 33 of the suction chamber conduit 31, contrary to the time of suction.

At this time, since the flow velocity of the blow-back refrigerant gas at the large opening end 32 is reduced, the influence of the blow-back refrigerant gas does not reach the rectifying pipe 30, but is caused by the blow-back refrigerant gas.
Generation of pulsation of the refrigerant gas can be damped. Further, at the time of suction, the refrigerant gas, the flow of which is regulated by the rectifying tube 30, is sucked in the suction chamber conduit 31 while gradually increasing the flow velocity, so that eddy current is less likely to occur and smooth suction is possible.

Therefore, the pulsation and noise of the compressor due to the pulsation of the sucked refrigerant gas can be reduced, and high efficiency can be maintained due to the stable suction flow.

By the way,

[0019]

As described above, according to the present invention, the suction muffler having the suction chamber conduit having one end communicating with the suction chamber, the baffle separating the suction muffler into the expansion chamber and the resonance chamber, and the baffle penetrating the baffle. A resonance chamber side end of the rectification pipe is close to a large opening end of the suction chamber conduit, and a small opening end of the suction chamber conduit is in the suction hole of the valve plate forming the suction chamber. By providing the configuration close to each other, the influence of the pulsation due to the blown-back refrigerant gas does not affect the rectifying pipe, and as a result, the pulsation transmission to the evaporator of the refrigeration cycle can be reduced, and a compressor with less noise and vibration can be provided. Further, since the generation of the vortex flow of the refrigerant gas is reduced and stabilized in the suction process, high efficiency can be maintained.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a hermetic compressor showing an embodiment of the present invention.

FIG. 2 is a sectional view of the same main part.

FIG. 3 is a vertical sectional view of a conventional hermetic compressor.

FIG. 4 is a sectional view of a main part of the conventional hermetic compressor shown in FIG.

[Explanation of symbols]

 1 Airtight Container 2 Compression Element 3 Electric Element 6 Cylinder Head 7 Suction Pipe 8 Discharge Chamber 9 Cylinder Block 10 Cylinder 11 Valve Plate 12 Suction Hole 13 Discharge Hole 15 Piston 19 Suction Muffler 21 Baffle 23 Resonance Chamber 30 Rectification Pipe 31 Suction Chamber Conduit 32 Large opening edge 33 Small opening edge

Claims (1)

[Claims] 1. A cylinder block having an electric element elastically supported in a closed container and a cylinder.
A compression element, a cylinder head attached to the cylinder block and forming an intake chamber and a discharge chamber, and an intake hole and a discharge hole interposed between the cylinder head and the end surface of the cylinder that slides the piston. A valve plate, a suction muffler having a suction chamber conduit, one end of which communicates with the suction chamber, a baffle that partitions the suction muffler into an expansion chamber and a resonance chamber, and a rectifying pipe that penetrates the baffle. The one end on the resonance chamber side of the rectifying tube is close to the large opening end of the suction chamber conduit, and the small opening end of the suction chamber conduit is close to the suction hole of the valve plate forming the suction chamber. Characteristic hermetic compressor.