JPH04311686A - Closed type motor-driven compressor - Google Patents

Abstract

PURPOSE:To reduce noise generated from the piping of a cooling system or the like due to the flow fluctuation (pulsation) of compressed refrigerant gas. CONSTITUTION:At the time of connecting a discharge line 13 to a discharge pipe 14, pulse suppressing material is provided inside the discharge line 13.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic electric compressor (hereinafter referred to as a compressor) used in refrigerators and the like.

0002

2. Description of the Related Art In recent years, there has been a trend toward smaller size and higher performance of compressors in order to save space and reduce costs. To achieve this objective, improvements have been made to obtain high performance and low noise within a small closed container (for example, Japanese Patent Application Laid-open No. 85270/1983).

A conventional compressor will be explained below with reference to the drawings. 4 and 5 show a conventional general compressor.

In the figure, reference numeral 1 denotes a compressor consisting of an electric motor 3 and a compression structure 4 housed in a closed container 2. As shown in FIG. Reference numeral 5 denotes a cylinder constituting the compressor 4, and includes a piston 6 that reciprocates in the horizontal direction by the power of the electric motor 3, and a cylinder head 7 having a suction valve, a discharge valve, and a valve plate (none of which are shown). ing. The crankshaft 8 converts the rotation of the electric motor 3 into reciprocating motion of the piston 6 via a conduit 10 fitted into an eccentric portion 9.

FIG. 11 shows a series of discharge lines that lead the refrigerant gas compressed in the cylinder 5 to the cylinder head 7, the discharge muffler, the discharge line 13, and the outlet pipe 14 fixed to the closed container 2. . Further, the refrigerant gas is delivered from the discharge pipe 14 to a condenser (not shown) of the cooling system.

Regarding the compressor configured as above,
The operation will be explained below. First, when the electric motor 3 rotates, the crankshaft 8 transmits the rotation as a reciprocating motion to the piston 6 loosely fitted in the cylinder 5 via the conduit 10, thereby compressing the refrigerant gas.

The compressed refrigerant gas passes through the discharge valve and is led to the cylinder head 7 of the discharge line 11, the discharge muffler 12, the discharge line 13, and the discharge pipe 14, and then discharged to the condenser of the cooling system. In addition, the discharge system 11 not only guides the compressed refrigerant gas from the cylinder 5 to the discharge pipe 14, but also changes the flow path resistance of the elements constituting the discharge system 11 to prevent fluctuations in the flow of gas present in the compressed gas ( It plays an important role in suppressing noise caused by vibrations in cooling system piping, etc. by attenuating vibrations (pulsations).

[0008]

[Problems to be Solved by the Invention] However, in the above-described configuration, the components of the discharge system 11 are also required to have mechanical strength to withstand repeated impacts during operation and stop of the compressor. Since the inner diameter of the discharge line 13 cannot be made thinner than a certain level, fluctuations in the flow of the compressed refrigerant gas remain undamped and are discharged through the discharge pipe 14 to the condenser of the cooling system, causing piping problems. The problem was that it caused noise when it was shaken.

Furthermore, if a method for attenuating the flow resistance of compressed gas (larger volume or larger flow resistance) is incorporated into the discharge line 11 from the cylinder 5 to the discharge muffler 12, the compressor will become larger or the startability will be reduced due to increased discharge pressure. becomes.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a hermetic electric compressor that reduces noise generated from piping of a cooling system due to fluctuations in the flow of compressed refrigerant gas.

[0011]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the hermetic electric compressor of the present invention incorporates a control wire having spring properties in the discharge line connecting the high pressure part of the compression element. It was set up.

0012

[Operation] With the above-described configuration, the present invention has reliability that can withstand repeated shocks during operation and stop of the compressor, and allows the compressed refrigerant gas to be compressed without increasing the size of the compressor or hindering startability. By extremely suppressing flow fluctuations, noise can be reduced.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. Structures that are the same as those of the prior art will be denoted by the same reference numerals and detailed explanation thereof will be omitted. FIG. 1 is a sectional view of a compressor in one embodiment of the present invention. Figure 2
is a partial detailed view of FIG. 1, and FIG. 3 is a detailed view of parts of FIG. 2. Reference numeral 15 denotes a control wire installed in the discharge line 13 of the discharge system 11. The control wire is a thin wire having spring properties that is wound into a rod shape, and is connected to the discharge line 13 near the connection point between the discharge pipe 14 fixed to the closed container 2 which is the terminal end of the discharge line 11 and the discharge line 13. It is installed inside the corner part 16 of.

In the above configuration, the refrigerant gas compressed by the compression mechanism 4 passes through the discharge pipe 14 through the discharge line 11.
and then sent to the cooling system. At this time, since a control wire 15 is installed in the corner 16 near the terminal end of the discharge line 13 and the connection with the discharge pipe 14, fluctuations (pulsations) in the flow of the compressed refrigerant gas are attenuated. It has the effect of Therefore, noise can be reduced without increasing the size of the compressor or hindering start-up control.

[0015]

Effects of the Invention As described above, the present invention provides a discharge line that connects the high pressure part of the compression element and the discharge pipe with a control wire having spring properties, thereby making it possible to increase the size of the compressor and improve startup. Since fluctuations in the flow of compressed refrigerant gas can be extremely suppressed without impeding performance, noise can be reduced.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a compressor in one embodiment of the present invention.

[Figure 2] Detailed view of part of Figure 1

[Figure 3] Detailed diagram of parts in Figure 2

[Figure 4] Plan view of a conventional compressor

[Figure 5] Cross-sectional view of a conventional compressor

[Explanation of symbols]

13 Discharge line 14 Discharge pipe 15 Control wire rod

Claims (2)

[Claims] 1. A pulse control device in which a compression element and an electric element are elastically disposed in a closed container to which a discharge pipe is fixed, and a discharge line connecting a high pressure part of the compression element and the discharge pipe has a spring property. A hermetic electric compressor characterized by having a wire installed inside. 2. The hermetic electric compressor according to claim 1, wherein a control wire having spring properties is provided inside the bent corner of the discharge line.