JPS5946383A - Enclosed type compressor - Google Patents

Abstract

PURPOSE:To reduce noise generated by a non-return valve by a method wherein the inside of a delivery cover, covering the non-return valve, is formed as a delivery chamber and a pipe body, whose one end is opened in the delivery chamber and the other end thereof is closed, is provided while the length of the pipe body is designed so as to be one fourth of the wave length of the noise generated by the non-return valve. CONSTITUTION:A side housing 5 is provided with a delivery port 9 and the delivery cover 14, covering the non-return valve 11, to constitute the delivery chamber 15 between the side housing 5. The pipe body 16, whose one end is opened in the delivery chamber 15 and the other end is closed, is arranged in the delivery chamber 15 while the length (1) of the pipe is designed so as to be lambda/4 with respect to the wave length lambda of the noise generated by the non-return valve 11. The sound of collisions, generated by the non-return valve 11 repeating collisions against a stopper 13 and a valve seat 12, is sealed by the delivery cover 14 at first, and a part of it projects into the pipe body 16, is reflected by the closed end 18 and is released again from the open end 18 thereby cancelling each other and reducing the noise.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hermetic compressor used for compressing refrigerant in a V-tube, such as a household nitrogen training device.

This type of hermetic compressor includes an electric motor section and a compressor section driven by the electric motor section within a closed case. "-The compression-like part is provided with a discharge hole for the compressed refrigerant and a check valve for this discharge hole, and this check valve is usually constituted by a reed valve. However, the reed valve has a valve body that is When it hits the stopper and valve seat, it generates a collision sound, which is the cause of compressor noise.

For this reason, in the past, measures such as covering the check valve itself with a sound-deadening cover have been adopted in order to reduce the above-mentioned noise, but if only the sound-muffling cover is used, the internal sound pressure increases. However, in some cases, the sound-absorbing cover resonated and caused even louder noise.

The present invention was made based on the above circumstances, and its purpose is to provide a hermetic compressor that can satisfactorily reduce the noise emitted from the check valve.

That is, this invention provides a discharge cover with a check valve in the compressor section, forms a discharge chamber inside the discharge chamber, and provides a pipe body in the discharge chamber with one end open and the other end closed. It is characterized in that the length of the tube body is set to the length of 174 wavelengths of the noise emitted from the check valve.

An embodiment of the present invention will be described below based on the drawings.

In the figure, reference numeral 1 denotes a closed compressor case, and the case 1 houses an electric motor section 2 and a compressor section 3 that compresses refrigerant using the driving force from the electric motor section 2. The case 1 is composed of a case body 1a made of an iron plate formed into a cylindrical shape, a bottom cover 1b that seals an opening at one end of the case body 1a, and a lid 1*1c that seals an opening at the other end of the case body 1a. These are sealed together by welding.

The compressor section 3 includes an iron cylinder housing 4 having a cylindrical inner surface, side housings 57 and 6 disposed to cover both ends of the housing 4, and a rotating shaft 28 of the electric motor section 2.
A ring-shaped roller 7 is crimped to the cylinder housing 4 and is arranged in a knitted manner inside the cylinder housing 4. The ring-shaped roller 7 is slidably inserted into the vane groove of the cylinder housing 4, and its tip receives the pressing force of the spring. The roller 7 is provided with a vane that is always in sliding contact with the outer periphery of the roller 7. It should be noted that the vane ridge, spring, and vane are not shown.

This compressor section 3 has a cylinder housing inner surface 4.
A cylinder chamber R is formed in a space defined by the housings 5 and 6 on both sides, the outer periphery of the roller 7, and the vane.
The refrigerant is sucked in, compressed, and discharged in accordance with changes in the volume of the cylinder chamber R. That is, a suction hole 8 is opened at a portion of the housing 4 where the volume of the cylinder chamber R increases, and is adapted to suck refrigerated air from an evaporator of a refrigeration cycle (not shown) into the cylinder chamber R. A discharge hole 9 is provided in the side housing 5 at a portion where the volume of the cylinder chamber R is reduced the most. The discharge hole 9 is provided facing the space 1o between the electric motor section 2 and the compressor section 3. A reed valve 1 is provided in the side housing 5 as a check valve for opening and closing the discharge hole 9. When the pressure in the cylinder chamber R exceeds a predetermined value, the reed valve 11 is pushed by the pressure. Move away from the valve seat 2 and open the discharge hole 9. At this time, the gate valve 11 hits the stopper 13.

The side housing 5 is provided with a discharge cover 14 that covers the discharge hole 9 and the reed valve 1. A discharge chamber 15 is provided between the discharge cover 14 and the side housing 5.
is configured.

This discharge chamber 15 has an opening I)f, 16 as shown in FIG.
is located. One end of this front body 16 is open to the discharge chamber 15, and the other end is closed, and the lifting platform 16 of this embodiment is divided by a partition wall 16a for a discharge of ¥152. In other words, work! , lJ wall 1
6a is formed integrally with the discharge cover 14, and the inner wall of the discharge cover 14 ('mouth) The opening end 17 of this tube body 16 is still close to the discharge hole 9, and the discharge cover 14 of the closed base 4181 law, which is the opposite of that, is configured. A communication hole 19 is formed that communicates with the space 10.The length i of the oil body 16 is equal to the length t of the reed valve 1.
), the length is set to λ/4 of the wavelength λ of the noise emitted from the noise source.

According to the above configuration, the compressed refrigerant in the cylinder chamber R is discharged from the discharge hole 9 into the discharge chamber 15 and then discharged into the space 10 through the communication hole 19 of the discharge chamber 150. And this space l.

The refrigerant discharged inside passes through the gap in the electric motor part 2, cools the movable parts at the same time, and then passes through the upper cover 1c of the upper part of the case 1.
The refrigerant is discharged from the opening 2 of the refrigerant outlet pipe 2o connected to the condenser of the refrigeration cycle.

The operating noise of the compressor is the collision sound caused by the reed valve 11 repeatedly colliding with the stopper 13 and the valve seat 12. By arranging the pipe body 16 and connecting the pipe body 16 to the discharge chamber 15, it is possible to reduce noise. In other words, the collision sound emitted from the reed valve 11 is first insulated by the discharge cover 14, and a portion of the collision noise still enters from the open end 17 of the tube body 16, and is opposed at the closed end J8. Then, the above-mentioned open end 17 is also emitted, so that this reflected sound and the above-mentioned collision sound cancel each other out, thereby reducing the noise.

That is, the head t of the eyebrow body 16 is λ with respect to the wavelength λ of the noise.
Since the length is set to /4, the opening end 17
The reflected wave Q' emitted from this opening end 17 with respect to the incident wave of the collision sound incident from Noise in the discharge chamber 15 can be efficiently muffled.

In addition, in the case of the above example, the sound velocity in the refrigerant R22 is about 17
0rrV/8, reed valve 1 no 1i11j protrusion I side 80
Since it is 0 Hz, the wavelength λ of this technique is 21
．． 25c7n, and therefore, l ij 1' length ttl λ/4 = 21.25/4 x 5.3 ttn.

However, in this embodiment, since the second seal 16 is formed on the inner wall of the discharge cover 14, the size of the whole is almost increased. The pulsation of the compressed refrigerant discharged from the discharge hole 9 can be attenuated.

Note that the present invention is not limited to the above embodiment. For example, in the above embodiment, the partition wall 16a constituting the chamber partition 16 is formed integrally with the discharge cover 14, but as shown in FIG.
6a may be formed integrally. It's a sword, tube 1
6 is not limited to being disposed within the discharge chamber 15, but may be provided along the outer wall surface of the discharge chamber 15 as shown in FIG. Further, the present invention is applicable not only to the side housing 5 but also to a DJ device in which the other side housing 6 is provided with the discharge hole 9 and the reed valve 1.

As explained above, the present invention provides a discharge cover covering a check valve in a compressor section, and forms a discharge chamber inside the discharge chamber, and a pipe body with one end open and the other end closed in the discharge chamber. The pipe length of this pipe body is set to the length of 174 wavelengths of the noise emitted from the above-mentioned check valve. Therefore, even if the discharge cover can produce a nine-tone sound, the noise in the discharge chamber and the reflected wave emitted from the end of the tube cancel each other out, resulting in ffJ-1, J'. It is possible to muffle the sound.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 show one embodiment of the present invention.
The figure shows the longitudinal cross section of the entire 1st section, 21st section 1 is shown in Figure 15 -
■A sectional view along the line, Figure 93 shows another embodiment, Figure 3 is a top view of the compressor section, and Figure 4 is IV-IV in Figure 3, the cape. There are 1 song and 1 song in V and N3. DESCRIPTION OF SYMBOLS 1... Case, 2... Electric motor part, 3... Compressor part, 9... Discharge hole, 11... Reed valve (check valve), 14
... l Shode cover, 16... pipe body. Applicant's agent Patent attorney Takeshi Suzue

Claims (1)

[Claims] In a hermetic compressor in which an electric motor section and a compressor section driven by the electric motor section are housed in a closed case, the compressor section is provided with a discharge hole for compressed refrigerant and a discharge cover that covers a check valve of the discharge hole. A discharge chamber is formed in the space between the discharge cover and the compressor section, and a pipe body with one end open and the other end closed is provided in the discharge chamber, and the pipe length of this 6゛ body is as described above. A split-close type compressor characterized in that the length is set to 1/4 wavelength of the l-sound emitted from the check valve.