JPH02176197A - Muffler device of compressor - Google Patents

Abstract

PURPOSE:To facilitate the processing of a resonance muffler and prevent the deviation of frequency band caused by assembling by forming a space between contact faces of a valve seat part and a valve plate, and providing a communication hole for communicating the space and a discharge port on the valve seat part. CONSTITUTION:On an outer periphery of a valve seat part 12 is formed a recessed part 15 whereby the valve seat 12 is fitted in a hole of an upper bearing part 8 and space is formed between the contact face of the valve seat part 12 and the upper bearing part 8. A communication hole 16 is formed on the valve seat part 12 to communicate the recessed part 15 with a discharge port 13. The recessed part 15 then forms a discharge resonance muffler. Processing of a resonance muffler is thus facilitated, and deviation of the frequency hand caused by assembling is prevented.

Description

[Detailed description of the invention] (b) Industrial application fields This invention relates to an improvement in a noise reduction device for a compressor.

(B) Prior Art A conventional compressor is constructed as shown in, for example, Japanese Patent Laid-Open No. 59-3198. Here, a conventional example will be explained with reference to this publication.6 In Figs. 5 and 6,
50 is a cylinder, and a roller 51 and a vane 52 are housed inside this cylinder. An upper bearing part 54 and a lower bearing part 55 are provided at both ends of the cylinder 50 to support the rotating shaft 53 and close the opening of the cylinder 50. The lower bearing part 55 has a discharge hole 5 formed in two stages with a large diameter and a small diameter.
6 is provided. The large-diameter discharge hole 56 is provided on the cylinder 50 side. 57 is a discharge valve, and this discharge valve is connected to the lower bearing portion 5 so as to open and close the small diameter side of the discharge hole 56.
It is attached to 5. 58 is a pressure introduction path component;
This part is fitted into the large diameter discharge hole 56 of the lower bearing part 55 to form a space 59. The space 59 communicates with the discharge hole 56 via a slit-shaped pressure introduction passage 60 formed around the entire circumference by the lower bearing portion 55 and the pressure introduction passage component 58.

In the compressor of this structure, the pressure pulsating component of the refrigerant gas generated when it is compressed in the cylinder 50 and discharged from the discharge hole 56 is transferred to the large diameter discharge hole 56 of the lower bearing part 55 through the pressure introduction path component. The pressure pulsations of the refrigerant flowing through the discharge holes 56 are attenuated by a discharge resonance muffler formed by fitting the discharge holes 58 together.

(c) Problems to be Solved by the Invention However, the discharge resonant muffler has a pressure introduction passage component 58 fitted into the large diameter part of the discharge hole 56 formed in two stages, and the pressure introduction passage 60 is formed in a slit shape all around the circumference. Since the pressure introduction path 60 is formed over a wide range, even if the height of the pressure introduction path 60 is slightly decreased, the resonant frequency band will be significantly shifted, and there is a problem that pressure pulsations that affect other parts cannot be attenuated.

This invention is intended to solve the above-mentioned problems, and aims to reduce the processing time of a resonant muffler and to prevent the frequency band from shifting due to assembly.

(D) Means for Solving the Problems This invention comprises a compression element in a closed container consisting of a cylinder, a piston, a valve plate with holes, and a discharge valve,
The valve plate has a valve seat part having a discharge port that fits into a hole in the plate, a space is provided at the contact surface between the valve seat part and the valve plate, and the valve seat part has a space and a discharge port. A communication hole is provided to communicate with each other.

(*) Effect This invention is configured as described above, so that even if a discharge resonance muffler is formed by fitting the valve seat part into the hole of the valve plate, the container between the space and the communication hole does not change. The discharge resonance muffler is designed to attenuate pressure pulsations that affect other parts.

(f) Examples The present invention will be explained below based on the examples shown in FIGS. 1 to 3.

Reference numeral 1 denotes a closed container, in which an electric element 3 having a rotation shaft 2 on the upper side and a rotary compression element 4 driven by the rotation shaft 2 of this electric element on the lower side are housed. The element 4 includes a cylinder 5, an eccentric portion 6 of the rotating shaft 2,
A roller 7 that is fitted into this eccentric part and rotates inside the cylinder 5, an upper bearing part 8 and a lower bearing part 9 that seal the opening of the cylinder 5, and an integrated discharge muffler 10 that is attached to cover the surface of this upper bearing part. It is composed of. Upper bearing part 8
A hole 11 is provided in the hole 11 . 12 is the hole 1 of the upper bearing part 8
This valve seat part is made of a vibration-absorbing material and is fitted into the valve seat part 1, and this valve seat part is provided with a discharge port 13 that communicates between the inside of the cylinder 5 and the inside of the discharge muffler unit 10. A discharge valve 14 for opening and closing the discharge port 13 is attached to the upper bearing portion 8 on the outlet side of the discharge port.

15 is a recess provided on the outer periphery of the valve seat part 12, and this recess is used to fit the valve seat part 12 into the hole 11 of the upper bearing part 8.
A space is formed between it and the contact surface of the upper bearing part. 1
Reference numeral 6 denotes a communication hole provided in the valve seat component 12, and this communication hole allows the four parts 15 to communicate with the discharge port 13, so that the four parts form a discharge resonance muffler.

In the compressor muffling device configured as described above, the refrigerant that has flowed into the cylinder 5 is compressed by [J-27], and is discharged from the discharge port 13 into the discharge muffler unit 10 by opening the discharge valve 14, and is then sealed. It is discharged through the inside of the container 1 to the outside of this container.

The resonant muffler formed by the recess 15 and the communication hole 16 provided in the valve seat part 12 opens perpendicularly to the flow direction of the refrigerant flowing through the discharge port 13, so that the refrigerant compressed during the discharge stroke is rapidly released. pressure pulsation component due to expansion,
At the end of the discharge stroke when the discharge valve 14 is closed, the compressed refrigerant remaining in the vicinity of the discharge port 13 is released to the low pressure chamber in the cylinder S, and the pressure pulsation component caused by rapid expansion is attenuated. This also reduces the level of pressure waves transmitted inside the cylinder 5. Furthermore, by attenuating the frequency components that transmit noise to the outside, the resonant muffler makes it possible to suppress noise in the entire frequency range.

The space is formed by aligning the valve seat part 12 with the hole 11 of the upper bearing part 8. Therefore, a space is formed at the contact surface between the upper bearing part 8 and the valve seat part 12, and
The communication hole 16 communicates with the discharge port 13, so that the sealing performance of the contact surface between the cylinder 5 and the upper bearing portion 8 is not impaired.

Additionally, the valve seat component 12 is made of a resin material such as Teflon to reduce noise caused by contact with the discharge valve 14 that opens and closes the discharge port 13.

By fitting the valve seat part into the hole in the upper bearing part, this invention makes it possible to form a resonant muffler that attenuates specific frequencies of pressure pulsation components without changing its characteristics, and without impairing space Φ machinability. This allows for free design.

In the above description, the space is formed by the four parts 15 provided on the outer periphery of the valve seat part 12, but as shown in FIG. It goes without saying that even if a plurality of communication holes 19 are provided, the same effect can be obtained. Furthermore, it goes without saying that the same effect can be obtained even if the concave portion and the communicating hole are made to have the same shape to form a side branch type muffler.

(G) Effects of the Invention The compressor muffling device of the present invention includes a compression element in a closed container, a cylinder, a piston, and a valve plate with holes.
a discharge valve, the valve plate having a valve seat part having a discharge port fitted into a hole in the plate;
Since a space is provided on the contact surface between the valve seat component and the valve plate, and a communication hole is provided in the valve seat component to communicate the space and the discharge port, the contact surface between the valve seat component and the valve plate is By connecting the formed space to the discharge port through a communication hole to form a resonant muffler, a resonant muffler that attenuates the specific frequency range that excites the compressor in the pressure pulsation component is installed at the contact surface between the cylinder and the valve plate. This can prevent the sealing performance from deteriorating. Moreover, by forming the valve seat component having a discharge port that is opened and closed by the discharge valve from a vibration absorbing member, noise caused by contact between the discharge valve and the valve seat component can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a rotary compressor showing an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the main parts of the discharge valve device, Fig. 3 is a sectional view of the valve seat parts, and Fig. FIG. 5 is a cross-sectional view of a rotary compressor showing a conventional example, and FIG. 6 is an enlarged cross-sectional view of a main part of a discharge valve device. 1... Airtight container, 3... Electric element, 4...
Rotating compression element, 5... Cylinder, 7... Roller, 8... Upper bearing portion, 11... Hole,
12.17... Valve seat part, 13... Discharge port, 14... Discharge valve, 15.18... Recessed part,
16.19...Communication hole. Figure 1

Claims (1)

[Claims] 1. An electric element and a compression element are housed in a sealed container, and the compression element is a cylinder, a piston that compresses refrigerant within this cylinder, a valve plate attached to the open end of the cylinder, and a cylinder of this plate. and a discharge valve mounted on the opposite side of the compressor, the valve plate having a hole, the plate being provided with a valve seat part having a discharge port that fits into the hole, and the valve plate having a hole. A space is provided on the contact surface between the seat part and the valve plate,
A silencer for a compressor, characterized in that the valve seat component is provided with a communication hole that communicates the space with the discharge port.