JPH10318147A - Hermetic electrically driven compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve muffling performance and suction efficiency, by adding to a lead valve one or both of acoustic resonance energy determined by sizes of a suction hole and a reflecting plate and acoustic resonance energy determined by size of a branch pipe, and by controlling vibration amplitude. SOLUTION: In a compressing process when a piston 12 lifts up, a lead valve 15 closes, the suction gas in a duct 17 is blocked rapidly, the internal pressure increases, and the refrigerant gas flows from an opening 19' into a refrigerant passing branch pipe 19. In a next suction process, the pressure in a cylinder becomes negative, immediately the refrigerant gas is supplied from the refrigerant passing branch pipe 19 and is charged into the cylinder effectively. In addition, using energy generated at an acoustic resonance frequency determined by the length of a branch pipe 19, vibration amplitude of the lead valve 15 is controlled. When opening/closing timing of the lead valve is suitable in relation to the rotational angle of a crankshaft 9, vibration amplitude of the lead valve becomes larger cause by acoustic energy, the amount of the charged gas increases, and therefore, muffling performance is improved.

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 in a refrigerating apparatus such as a home refrigerator or a showcase, and more particularly to a suction efficiency and low noise of a suction system.

[0002]

2. Description of the Related Art Conventionally, as a suction system of a hermetic electric compressor, for example, Japanese Patent Publication No.
As shown in the publication, a muffler having a chamber divided into a plurality of sections is used. However, there is a problem that if priority is given to noise reduction, the suction efficiency is reduced, and the performance is apt to be reduced.

In addition, since the suction gas flows intermittently due to the opening and closing of the reed valve, the flow inertia of the refrigerant gas cannot be sufficiently utilized, and the filling amount of the cylinder decreases. This tendency is likely to occur when the muffler's noise reduction performance is improved.

[0004]

The hermetic compressor has the following features.
It is required to improve the muffler's silencing performance and suction efficiency.

The present invention relates to such a muffler,
Without reducing the flow inertia of the refrigerant, increasing the filling amount in the cylinder, and eventually improving the noise reduction performance,
The purpose is to maintain and improve the compression performance of the compressor. Further, the opening and closing amplitude of the reed valve is controlled by acoustic resonance energy generated by the reflector and the refrigerant inlet / outlet pipe, thereby improving performance and efficiency.

[0006]

SUMMARY OF THE INVENTION In order to solve this problem, the present invention is directed to a housing in which a compression element constituted by an electric motor, a piston, a crankshaft, and the like is housed in a closed case. A reed valve and a pipe line from the suction hole to the suction muffler, a reflection plate having a flow port provided in a part of the pipe line, and a part of the suction gas from the reflection plate to the suction hole side. The refrigerant inlet / outlet pipes through which the air enters and exits are opened.

In a closed case containing a compression element constituted by an electric motor, a piston, a crankshaft, and the like, a reed valve for opening and closing a suction hole and a conduit from the suction hole to the suction muffler are provided. A reflection plate having a circulation port is provided in a part of the conduit, and a refrigerant inlet / outlet pipe for allowing a part of the suction gas to flow in and out is provided, and the sound is determined by a size between the reflection plate and the suction hole. The resonance amplitude controls the vibration amplitude of the reed valve.

[0008] Further, in a closed case in which a compression element constituted by an electric motor, a piston, a crankshaft and the like is housed in a closed case, a reed valve for opening and closing a suction hole and a conduit from the suction hole to the suction muffler are provided. A reflection plate having a circulation port is provided in a part of the conduit, and a refrigerant inlet / outlet pipe for allowing a part of the suction gas to flow in and out is provided, and the sound is determined by a size between the reflection plate and the suction hole. The vibration amplitude of the reed valve is controlled by both the resonance energy and the acoustic resonance energy determined by the specifications of the refrigerant inlet / outlet pipe.

Therefore, one or both of the acoustic resonance energy determined by the dimensions of the suction hole and the reflector and the acoustic resonance energy determined by the dimensions of the branch pipe are applied to the reed valve to control the vibration amplitude. , Performance and efficiency.

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 is a sectional view of a hermetic electric compressor, and FIG. 2 is a sectional view taken along line II-II 'of a suction muffler.

Reference numeral 1 denotes a hermetic electric compressor, in which a compression unit 5 having a compression element 3 integrated therein and an electric motor 4 integrated therein is elastically supported by a spring 6 in a closed case 2.

Reference numeral 7 denotes a cylinder block. A bearing 8 supports a crankshaft 9, and an eccentric portion 10 is connected to a piston 12 via a connecting rod 11. 13 is a valve plate provided with a suction hole 14 and a discharge hole (not shown), and 15 is a reed valve for opening and closing the suction hole 14. 1
6 is a cylinder head.

Reference numeral 17 denotes a suction muffler, which is connected by a pipe 18 extending from the suction hole 14 to the suction muffler 17. Reference numeral 19 denotes a refrigerant inlet / outlet pipe provided to be opened in the middle of the pipe 18. The branch pipe 19 may be integral with or separate from the pipe 18. Reference numeral 20 denotes a refrigerant suction port of the suction muffler 17. Reference numeral 21 denotes a refrigerant inlet 21 that passes through the closed case 2.
And a suction pipe arranged opposite to the suction pipe. Reference numeral 22 denotes a reflection plate having a distribution port 23, which is arranged upstream of the branch pipe 19.

The operation of the hermetic electric compressor configured as described above will be described below.

In the suction stroke of the electric compressor 1, when the reed valve is open, the refrigerant gas is supplied to the suction muffler 17
The fluid flows into the cylinder through the pipe 18. Next, when the piston 12 rises and enters the compression stroke, the reed valve 15 closes, and the suction gas in the pipe line 17 is rapidly blocked. 19 is filled.

In the next suction stroke, the pressure in the cylinder becomes negative, and the refrigerant gas is immediately supplied from the refrigerant inlet / outlet pipe 19, so that the refrigerant is efficiently charged into the cylinder without losing the inertia of the refrigerant. You. The same applies when the reed valve 15 opens and closes a plurality of times (usually two or three times) during the suction stroke.

Therefore, the efficiency of filling the cylinder does not deteriorate due to the intermittent flow of the suction refrigerant gas as in the prior art, and the suction efficiency can be maintained and improved.

Further, the vibration amplitude of the reed valve 15 is controlled by the energy generated at the acoustic resonance frequency determined by the length of the branch pipe 19.

That is, the reed valve 15 generates an opening / closing vibration substantially at a primary natural frequency determined by its shape and model. When the opening / closing timing is good with respect to the rotation angle of the crankshaft 9, the above-described acoustic energy is applied in a direction in which the reed valve 15 further opens, so that
The vibration amplitude of the reed valve 15 is increased, the amount of gas charged into the cylinder is increased, and the performance is improved.

Conversely, when the opening / closing timing of the reed valve 15 is deviated, the acoustic energy is applied at the closing timing, so that the reed valve 15 that is being opened is opened.
Is corrected in the closing direction to control the opening / closing timing.

On the other hand, the reflection plate 22 also has the suction hole 14 and the reflection plate 2.
The acoustic resonance energy determined by the size of No. 2 can be generated, and the amplitude of the reed valve 15 can be controlled similarly.

FIGS. 3 to 8 show other embodiments showing various forms of the distribution port 23 provided in the reflection plate 22. FIGS.
FIG. 6 shows a case in which a plurality of flow openings 23 are arranged in an array, FIG. 5 shows a flow case in which a number of small holes 23 are arranged on the periphery thereof, and FIGS. Shapes or slots are arranged in parallel, and are selected according to pressure loss, aperture ratio, etc.

FIG. 9 shows another embodiment.
The suction muffler 17 is divided at the partition wall 24,
, A part of the partition wall 24 is formed as a reflector, and a gap between the two is formed as a circulation port 23, and the branch pipe 19 is formed inside the suction muffler 17 to make the configuration compact. It is possible to obtain the same effects as described above.

[0024]

As described above, according to the present invention, the discontinuity of the refrigerant gas in the conventional suction system can be mitigated, so that the suction efficiency can be improved and the muffler's noise reduction performance can be improved.

Further, if the closed small chamber is arranged in the suction muffler, the structure of the suction muffler can be simplified. Further, by forming a closed small chamber according to the number of rotations, optimum efficiency can always be improved at a plurality of rotations. Further, by bringing the opening of the closed cell close to the suction hole, the effect is further increased. Furthermore, since the cross-sectional area of the inflow port of the suction muffler can be made smaller than that of the suction hole, sufficient noise reduction performance can be achieved, and a compressor with good performance and quietness can be provided.

Further, by controlling the vibration amplitude of the reed valve by the acoustic resonance energy determined by the specifications of the reflection plate and the refrigerant inlet / outlet pipe, the performance and efficiency can be improved and the practical effect is high. is there.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view taken along line II-II ′ of FIG.

FIG. 3 is a sectional view taken along line III-III ′ of FIG. 1;

FIG. 4 is a sectional view corresponding to FIG. 3, showing another embodiment.

FIG. 5 is a sectional view corresponding to FIG. 3, showing another embodiment.

FIG. 6 is a sectional view corresponding to FIG. 3, showing another embodiment.

FIG. 7 is a cross-sectional view corresponding to FIG. 3, showing another embodiment.

FIG. 8 is a sectional view corresponding to FIG. 3, showing another embodiment.

FIG. 9 is a cross-sectional view corresponding to FIG. 2, showing another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hermetic electric compressor 2 Hermetic case 3 Compression element 4 Electric motor 9 Crankshaft 12 Piston 14 Suction hole 15 Reed valve 17 Suction muffler 18 Pipeline 19 Refrigerant in / out branch pipe 22 Reflector 23 Flow port

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masataka Oda 4-2-5 Takaida Hondori, Higashi Osaka City, Osaka Inside Matsushita Refrigeration Co., Ltd.

Claims (3)

[Claims] An electric motor and a piston in a closed case;
A retraction valve that opens and closes a suction hole and a conduit that extends from the suction hole to a suction muffler. A hermetic electric compressor comprising a reflector, and a refrigerant inlet / outlet pipe for allowing a part of the suction gas to enter and exit from the reflector, on the suction hole side. 2. An electric motor and a piston in a closed case,
A housing containing a compression element constituted by a crankshaft or the like, which is provided with a reed valve for opening and closing a suction hole and a pipeline from the suction hole to the suction muffler. In addition to providing a reflector, a refrigerant inlet / outlet pipe for allowing a part of the suction gas to enter and exit is provided, and the vibration amplitude of the reed valve is controlled by acoustic resonance energy determined by a dimension between the reflector and the suction hole. Hermetic electric compressor. 3. An electric motor and a piston in a closed case,
A housing containing a compression element constituted by a crankshaft or the like, which is provided with a reed valve for opening and closing a suction hole and a pipeline from the suction hole to the suction muffler. A reflector plate is provided, and a refrigerant inlet / outlet pipe for allowing a part of the suction gas to enter / exit is provided, and the acoustic resonance energy determined by the size between the reflector and the suction hole and the specifications of the refrigerant inlet / outlet pipe are determined. A hermetic electric compressor that controls the vibration amplitude of the reed valve with both the acoustic resonance energy to be applied.