JPS5835284A - Silencer of refrigerant compressor - Google Patents

Abstract

PURPOSE:To assemble a silencer made of plastics for sure by providing coupling holes on either one of a body and cover body made of synthetic resin and coupling lugs on the other one and by inserting an inner partition board between the main body and cover body against its elastic force. CONSTITUTION:When a silencer 12 is to be fitted to a cylinder head 7, the main body 14 is placed at a preset position on the cylinder head 7 and is supported by inserting a connecting pipe 16 by force into a suction hole 7a and fixing it. Next, an inner partition board 15 is mounted on a flange step section 14b, and a cover body 13 is deppressed into a flange 14a against the elastic force of the inner partition board 15, then coupling lugs 17 are coupled with coupling holes 18 to complete the assembly, thus the coupling lugs 17 are firmly coupled with the coupling holes 18 by means of the repulsion of the inner partition board 15.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a muffling device for a hermetic electric compressor, and is particularly used for guiding refrigerant gas directly from a suction pipe to a cylinder via the muffling device.

In conventional electric compressors, the hermetic jacket is also used as a low-pressure vessel, so that the low-temperature, low-pressure suction refrigerant gas that returns through the suction pipe is temporarily stored in the space of the hermetic jacket before being sent to the compression element. It is sucked into the suction side. However, when the suction refrigerant gas is temporarily stored inside the sealed envelope,
In the meantime, the suction refrigerant gas is heated by the heat generated by the electric element and the compression element, and the temperature of the discharge refrigerant gas becomes correspondingly high, which not only adversely affects the gas itself, lubricating oil, or other elements, but also The volumetric efficiency of the compressor also deteriorates.

Conventionally, in order to improve this drawback, it has been known to introduce suction gas directly into the compression element, but such a structure causes noise generation due to pulsation during suction.
Furthermore, immediately after startup or shutdown, liquid refrigerant and circulating oil flow directly into the compressor, causing liquid compression and oil compression, which may cause major accidents such as damage to valves, crankshafts, and connecting rods. was there. Therefore, 1. It has been proposed to guide the suction refrigerant gas to the compression element, but in this case, in order to prevent the suction refrigerant gas from heating, it is possible to separate the silencer from the compression element body and use plastics with excellent heat insulation properties. , the above-mentioned effects are further enhanced, and there are also advantages such as light weight, low cost, and ease of molding. However, in the special atmosphere inside a hermetic electric compressor, the use of adhesives and other materials to create the plastic noise damping device lacked reliability, and the work process was also complicated. .

The present invention focuses on elasticity, which is a major characteristic of plastics, and utilizes the elasticity of the partition plate, which has the functions of silencing, liquid separation, and oil separation, to easily and reliably assemble a plastic noise damping device. , to be fixed.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a hermetic housing of an electric compressor, 2 a compressor comprising a stator 4, a rotor 5, a connecting rod 10 connected to an eccentric portion 11 of a crankshaft 6, and the like. is an element. Then, when the electric element 2 is activated and the crankshaft 6 rotates, its eccentric portion 11. As is well known, the piston 9 reciprocates within the cylinder 8 by the movement transmitted through the connecting rod 10 and sucks in, compresses, and discharges refrigerant gas.

Reference numeral 12 denotes a silencer made of plastic, such as polybutylene terephthalate, which is resistant to refrigerants, oil, and heat, and is located separately from the compression element, and as shown in cross section in FIG. It consists of a shaped lid 13, a cup-shaped body 14, and a partition plate 15.

The main body 14 has a suction hole 7a of the cylinder head 7 at its lower end.
The flange 14 has a flange 14a and a flat flange step portion 14b on the upper opening edge. The lid body 13 has a gas suction opening 13ai
The partition plate 15 has a pair of through holes 15a in the front and rear, and has a pair of locking claws 17 in the front and rear that engage in locking holes 18 provided in the main body 14. It curves gently upward towards the end.

In such a configuration, the silencer 12 is connected to the cylinder head 7.
When the main body 14 is mounted on the cylinder head 7, the main body 14 is placed in a predetermined position on the cylinder head 7, and the communication pipe 16 is supported by being press-fitted into the suction hole a. Next, the middle partition plate 16 is placed on the flange step portion 14b, and the cover body 13 is placed against the elasticity of the middle partition plate 15.
into the flange 14a, and insert the locking pawl 17 into the locking hole 18.
to complete the assembly. Then, the locking pawl 17 firmly engages within the locking hole 18 due to the repulsion of the partition plate 15. On the other hand, shaking of the partition plate 15 itself can also be prevented.

As mentioned above, the present invention is resistant to fluorocarbons and oil.

It has a cup-shaped main body made of a synthetic resin material such as polybutylene terephthalate with excellent heat resistance, and a lid body that covers the opening of the main body. It is equipped with a locking claw, a curved partition plate with a through hole, and the partition plate is interposed between the main body and the lid against its elasticity, and is suitable for fixing adhesives, screws, etc. No parts are required and the elasticity of the partition plate is used to create a lid body.
The main unit can be securely fixed, contributing to the practical use of synthetic resin silencers.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of a hermetic electric compressor compressor showing an embodiment of the present invention, Fig. 2 is a cross-sectional view taken along line A-A in Fig. 1 showing the silencer section in detail, and Fig. 3 FIG. 2 is an exploded perspective view of the silencer. 14. Main body, 13. Lid body, 15.
aa**a.・Through hole, 16...Inner partition plate, 17...
・Latching claw, 18...Latching hole 0

Claims (1)

[Claims] It has a cup-shaped main body made of a synthetic resin material divided into at least two parts, a lid body that covers an opening of the main body, and a curved partition plate provided with a through hole, the body and the lid body. A locking hole is provided on one side, and a locking pawl that engages with the locking hole is provided on the other side, and the partition plate is used to silence the refrigerant compressor interposed between the main body and the lid through its elasticity. Device.