JPH0278774A - Muffler for compressor - Google Patents

Abstract

PURPOSE:To insure a large passage area for suction gas of a connecting pipe and facilitate assembling work by providing an opening on a cylinder head while forming in one body a tapered connecting pipe on a muffler, and connecting the muffler to the cylinder head while pinchedly holding the connecting pipe with the head and a gasket. CONSTITUTION:A tapered opening which is gradually contracted its diameter in the inward direction and has a recessed groove 17 on the inner circumference, is formed on the side wall of a suction chamber 14 of a cylinder head 15. Further, a tapered connecting pipe 21 having a rib 19 coinciding with the recessed groove 17 on its circumference and a flat plane part 20 on one side, and gradually contracting its diameter in the extreme end direction is formed in one body with a suction muffler 16. The muffler 16 is connected to the cylinder head 15 by pinchedly holding the connecting pipe 21 with the head 15 and a gasket 13, at bolting up the muffler on the cylinder head 15 and the cylinder 7.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a silencer for a compressor used in refrigerators, showcases, etc.

(b) Conventional technology Conventionally, this type of compressor muffling device was developed in U.S. Pat.
As disclosed in Publication No. 986, a through hole and a recess are provided in the side wall of the cylinder head, and a connecting pipe and a protrusion are provided in the intake muffler made of synthetic resin, and the protrusion is connected to the head. The muffler is connected to the cylinder head by elastically inserting the connecting pipe into the through hole while engaging the recess.

(c) Problems to be Solved by the Invention However, according to the above configuration, the through hole in the cylinder and the Rad is a round hole, and due to the relationship with the size of the head side wall, the diameter of the through hole cannot be made very large. There was a problem in that the performance of the compressor deteriorated because a sufficient passage cross-sectional area of the connecting pipe could not be secured. Furthermore, although the muffler is designed to prevent rotation due to its structure of protrusions and recesses, the protrusions and recesses must be aligned when connecting the muffler, which impairs assembly work efficiency. Furthermore, since the connecting tube is held in the through hole by the elastic force of the shaft splitting process, there is the problem that gaps and looseness are likely to occur in the connecting section due to deformation due to thermal creep of the connecting tube as the temperature rises during compressor operation. there were.

The present invention has been made in view of these points, and it improves the performance of the compressor by ensuring a large passage area for the suction gas in the connecting pipe, and also eliminates the need for positioning the detent and reduces assembly work. The purpose of the present invention is to provide a compressor silencing device that is easy to use.

(d) Means for Solving the Problems The present invention provides a cylinder head that is attached to the open end surface of the cylinder of the compressor section via a gasket, and a separate type synthetic double-fat suction valve installed on the suction chamber side of the cylinder head. In the muffler, the muffler is integrally formed with a tapered connecting pipe that has ribs or grooves on its peripheral surface and a flat surface on one side and becomes smaller in diameter toward the tip. An opening having a groove or rib is provided in the side wall of the head on the side of the suction chamber, and a connecting pipe is connected between the head and the gasket so that the groove or rib of the head matches the muffler groove or groove and the flat part abuts the gasket. The muffler is connected to the cylinder head by clamping it.

(E) Function The compressor muffling device of the present invention has the above-described configuration, which makes it possible to increase the area of the opening of the cylinder head to increase the area of the gas passage of the connecting pipe, thereby improving the performance of the compressor. In addition, since rotation of the muffler can be prevented with a simple structure of forming a flat part on one side of the connecting pipe, there is no need to form a separate protrusion, and in addition, the position of the connecting pipe is Since it is determined uniquely by simply press-fitting the pipe, there is no need to align the protrusions, etc., and the assembly work efficiency can be improved. Moreover, since the connecting pipe is formed in a tapered shape, even after the cylinder head is mounted on the cylinder, the muffler can be connected to the head simply by press-fitting. Furthermore, since the elastic force of the gasket acts on the side portion of the connecting pipe, the sealing performance at the connecting portion can be improved and the performance of the compressor can be improved.

(f) Example Embodiments of the present invention will be described below with reference to the drawings.

1 is a hermetic type compressor in which a compressor part 3 and an electric motor part 4 for driving the compressor part 3 are housed in a hermetic case 2, and both parts 3 and 4 are connected by a crankshaft 5. The compressor 3 includes a cylinder 7 integrally formed with a frame 6, a piston 8 connected to the crankshaft 5 and reciprocating within the cylinder 7,
A cylinder having a suction valve plate 1o, a valve seat plate 11, a discharge valve plate 12, a gas scaler) 13 attached to the cylinder with bolts 9 in the following order so as to close the open end surface of the cylinder 7, and a suction chamber 14 inside. Herad 15 and a synthetic resin suction muffler 1 connected to the side wall of this cylinder head.
It consists of 6. Here, a tapered opening 18 is formed in the side wall of the cylinder head 15 on the suction chamber 14 side, the diameter of which gradually decreases inward and has a groove 17 on the circumferential surface. The suction muffler 16 also has a rib 19 on its circumferential surface that matches the groove 17, and a flat portion 20 on one side.
A tapered connecting tube 21 having a diameter that gradually decreases toward the tip is integrally formed. Then, when bolting the cylinder head 15 to the cylinder 7, the muffler 16 aligns the ribs 19 with the grooves 17, brings the flat portion 20 into contact with the gasket 13, sets the connecting pipe 21 in the opening 18, and connects the muffler 16 with the bolts. By sandwiching the pipe between the head 15 and the gasket 13, the cylinder is connected to the rad 15.

In the compressor configured in this manner, the opening 18 formed in the cylinder head 15 can be formed over a wide range up to the edge of the side wall of the head, so the cross-sectional area of the connecting pipe 21 can also be increased, and the gas in the chain pipe can be By increasing the passage area, the amount of refrigerant circulated can be increased and the performance of the compressor can be improved. Further, since rotation of the muffler 16 in the axial direction can be prevented with a simple configuration of just forming the flat part 20 on one side of the connecting pipe 21, it is possible to prevent the rotation of the muffler 16 in the axial direction. In addition, since the position of the connecting pipe 21 is uniquely determined, there is no need to align protrusions, etc., which prevents noise from the compressor due to vibration of the muffler 16 and improves assembly work efficiency. Also, there is no gas keratin on the flat surface of the connecting pipe 21! Since the elastic force of −13 is applied, good sealing performance is maintained at the connection portion, and the muffler 16 is securely fixed.

Furthermore, since the connecting pipe 21 is formed in a tapered shape, when assembling the cylinder head 15 as in this embodiment, the muffler 1 is sometimes
6, even after the cylinder head 15 is installed on the cylinder 7, the muffler can be connected to the head simply by press-fitting the connecting pipe 21 into the opening 18, which increases the freedom of design. will improve.

FIG. 5 shows another embodiment, in which the flat surface 24 of the connecting pipe 23 of the suction muffler 22 is knurled to form a rough surface 25, and this rough surface is bitten into the gasket. This makes the fixation stronger.

(g) Effects of the Invention As described above, according to the present invention, it is possible to secure a large passage area for the suction gas in the connection pipe of the suction muffler, improve the performance of the compressor, and also to install a separate detent device and It is possible to improve the assembly work by eliminating the need for positioning of the detent device, etc., and to provide a noise reduction device for a compressor that is free from noise caused by rattling.

[Brief explanation of the drawing]

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 main parts of the compressor, Fig. 3 is a front view of the suction muffler, and Fig. 4 is also a suction muffler. Top view of the muffler,
FIG. 5 is a front view of an intake muffler showing another embodiment. 7...Cylinder, 13...Gasket, 14...
Suction chamber, 15... Cylinder head, 16... Suction muffler, 17... Concave groove, 18... Opening, 19...
Rib, 20... Flat part, 21... Connecting pipe.

Claims (1)

[Claims] 1. A cylinder head is attached to the open end surface of the cylinder of the compressor section via a gasket, and a separate synthetic resin suction muffler is connected to the suction chamber side of the cylinder head, and the muffler includes: A tapered connecting pipe with a flat surface on one side and a tapered diameter toward the tip is integrally formed with ribs or grooves on its circumferential surface, while grooves or ribs are formed on the side wall of the cylinder head on the suction chamber side. The muffler is connected to the cylinder head by sandwiching the connecting pipe between the head and the gasket so that the groove or rib of the head matches the rib or groove of the muffler and the flat part abuts the gasket. Features a compressor silencer.