JPH05133376A - Closed type compressor - Google Patents

Abstract

PURPOSE:To reduce noise, caused by pulsation, by enabling the pulsation of refrigerant gas to effectively reduce and weaken with no necessity for difficult position adjustment or the like. CONSTITUTION:A cup muffler is double formed of internal/external side first/ second mufflers 29, 31. A delivery outlet 35 is provided in a 180 deg. symmetrical position to the position of a delivery port 25 with a rotary shaft serving as the center, in the first muffler 29. Two delivery outlets 37, 37' are provided symmetrically in directions 90 different from the position of the delivery outlet 35 of the first muffler 29 with the rotary shaft serving as the center, in the second muffler 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic compressor,
In particular, the present invention relates to a device devised to reduce noise caused by the pulsation of the refrigerant.

[0002]

2. Description of the Related Art As a hermetic compressor, there is, for example, one disclosed in Japanese Patent Laid-Open No. 63-36092. It is shown in FIG. In the case of the hermetic compressor shown here, when the electric motor element 101 is operated, the refrigerant is in the cylinder 103.
Inhaled into. The sucked refrigerant is compressed as the piston 105 rotates, and its pressure rises. Due to this increase in pressure, the discharge valve 107 is pushed open and discharged through the discharge hole 109 into the muffler 111. The refrigerant discharged into the muffler 111 is introduced into the closed container 115.

By the way, in the hermetic compressor having the above structure, there is a problem that the pressure pulsation of the refrigerant gas discharged into the hermetic container 115 is large and a large noise is generated due to the pressure pulsation. .. That is, a standing wave is generated in the closed container 115, and this standing wave causes the noise. Therefore, in order to reduce the generation of such noise, the following configuration is adopted. That is, as also shown in FIG. 4, the boss portion 1 of the upper bearing plate 117 is
On the side surface of 19, the convex portions 121, 12 shorter than the boss portion 119
1 is provided, and a through hole 127 that communicates with the upper end surface 123 and the lower end surface 125 of the convex portions 121, 121 is provided. On the other hand, the muffler 111 is shaped so as not to interfere with the convex portions 121, 121.

According to the above structure, the refrigerant gas discharged into the muffler 111 is discharged into the closed container 115 through the through hole 127. At this time, the through hole 127 constitutes a tail pipe, and the action of the tail pipe reduces or attenuates the pressure pulsation of the refrigerant gas discharged from the muffler 111 into the closed container 115. Thereby, noise is reduced.

[0005]

The above-mentioned conventional structure has the following problems. As described above, the two through holes 127 and 127 are provided, and the two through holes 12 are
By making the phases of the pulsations of the refrigerant gas discharged from Nos. 7 and 127 the same, the pulsations are mutually canceled, thereby reducing noise. However, in reality, the positions of the two through holes 127 and 127 have to be finely adjusted because they are affected by the flow of the refrigerant gas from the discharge hole 109. Further, since the flow velocity of the refrigerant gas varies depending on the pressure condition and the model, the position adjustment of the through holes 127 and 127 is also required due to this. As described above, if the positions of the through holes 127 and 127 are not adjusted, the desired pulsation reduction / attenuation effect cannot be obtained, and the adjustment work is difficult, which is not practical. there were.

The present invention has been made on the basis of such a point. The object of the present invention is to make it possible to effectively reduce / attenuate the pulsation of the refrigerant gas without requiring difficult position adjustment. The object of the present invention is to provide a hermetic compressor capable of reducing noise caused by pulsation.

[0007]

To achieve the above object, a hermetic compressor according to the present invention comprises a hermetic container and a compression element housed in the hermetic container, the compression element being a cylinder and a rotary member. It is composed of a roller that rotates in the cylinder by an eccentric part of the shaft, a frame body that seals the opening of the cylinder, and a cup muffler that covers the frame body, and the frame body communicates the inside of the cylinder and the inside of the cup muffler. In a hermetic compressor provided with a discharge port, the cup muffler is double formed with an inner first muffler and an outer second muffler, and the first muffler has a discharge port centered around a rotation axis. The discharge port is provided at a position 180 ° symmetrical to the position,
It is characterized in that the second muffler is provided with two discharge ports symmetrically with respect to the position of the discharge port of the first muffler in a 90 ° direction with respect to the rotation axis.

[0008]

In other words, the cup muffler has a double structure composed of the first muffler and the second muffler, and the positions of the discharge ports formed in the cup muffler are shifted so that the split muffler collides with each other in the process in which the refrigerant flows. Therefore, the pulsation of the refrigerant is reduced / attenuated, and the noise caused thereby is reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 1, there is an airtight container 1, in which an electric element 3 is arranged on the upper side and a rotary compression element 5 is installed on the lower side. The electric element 3 is composed of a stator 7 that is shrink-fitted and fixed to the inner wall of the closed container 1, and a rotor 13 that is mounted inside the stator 7 via an air gap 9 on a rotary shaft 11. There is.

The rotary compression element 5 includes a cylinder 15 and
A roller 19 that is rotated in the cylinder 15 by the eccentric portion 17 of the rotary shaft 11, and an upper frame body 21 and a lower frame body 23 that are in contact with the roller 19 and close the opening of the cylinder 15.
It consists of and. A vane 20 is installed on the outer periphery of the roller 19. Further, there is a discharge port 25, and this discharge port 25 is opened and closed by a discharge valve 27.

As shown in FIG. 2, an inner muffler 29 serving as a first muffler and an outer muffler 31 serving as a second muffler are fitted over the upper frame 21.
The inner muffler 29 and the outer muffler 31 constitute a cup muffler. A discharge chamber 33 is formed in the inner muffler 29, and a discharge port 35 is formed on the side surface of the inner muffler 29 forming the discharge chamber 33. The discharge port 35 is formed at a 180 ° symmetrical position with respect to the discharge port 25 of the upper frame body 21 described above. Further, the outer muffler 31 is formed with a pair of discharge ports 37 and 37 'at symmetrical positions of 180 °. The pair of discharge ports 37, 37 ′ are formed at positions displaced by 90 ° with respect to the discharge port 35 of the inner muffler 29. Further, in the upper frame body 21, the discharge port 25 has the first
It is formed in the recess 39. Further, a second recess 41 is formed in the upper frame 21, and the projection 43 formed on the inner muffler 29 is fitted in the second recess 41. This prevents misalignment.

The operation will be described based on the above configuration. First, the refrigerant flowing into the cylinder 15 is compressed by the cooperation of the roller 19 and the vane 20. The pressure of the refrigerant rises due to this compression, and the discharge valve 27 that closes the discharge port 25 is pushed up to open the discharge port 25.
Thereby, the refrigerant is discharged into the first recess 39. First
The refrigerant discharged into the recess 39 flows in the discharge chamber 33 of the inner muffler 29 in a two-way split manner, and is discharged into the outer muffler 31 via the discharge port 35. Then, the pair of discharge ports 3
The liquid is discharged into the closed container 1 through 7, 37 '.

[0013]

As described in detail above, according to the hermetic compressor of the present invention, the following effects can be obtained.
That is, the pulsation of the refrigerant can be effectively reduced and attenuated, and the noise can be reduced. This has a double structure of the cup muffler including the inner muffler 29 and the outer muffler 31, and the discharge port hole 25 and the discharge ports 35, 37, 37 '.
This is because the position is shifted. As a result, first, the flow of the refrigerant is divided in the discharge chamber 33 so that the directions of the flows are canceled each other. Further, even when the refrigerant is discharged from the outer muffler 31, the action of discharging the refrigerant from two directions and canceling each other is provided. Because it will work. Specifically, how much noise was reduced: 800 to 1
In the noise due to the standing wave of 000H _Z, with respect to the conventional type, it has been confirmed to have been reduced by about 10 to 15 dB.

[Brief description of drawings]

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

FIG. 2 is an exploded perspective view showing the relationship among the upper frame, the inner muffler, and the outer muffler, showing an embodiment of the present invention.

FIG. 3 is a cross-sectional view of a hermetic compressor, showing a conventional example.

FIG. 4 is an exploded perspective view showing a relationship between an upper frame and a muffler in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 airtight container 5 rotary compression element 11 rotary shaft 15 cylinder 19 roller 21 upper frame 25 discharge port 27 discharge valve 29 inner muffler (first muffler) 31 outer muffler (second muffler) 35 discharge port 37, 37 'discharge port

Claims (1)

[Claims] 1. A hermetic container, and a compression element housed in the hermetic container, the compression element sealing a cylinder, a roller rotating in the cylinder by an eccentric part of a rotation shaft, and an opening of the cylinder. In a hermetic compressor that includes a frame body and a cup muffler that covers the frame body, and the frame body is provided with a discharge port that communicates the inside of the cylinder and the inside of the cup muffler, the cup muffler is The first muffler and the outer second muffler are double-formed,
The muffler has 18
The discharge port is provided at a position symmetrical with 0 °, and the second muffler is provided with two discharge ports symmetrical with respect to the position of the discharge port of the first muffler about the rotation axis by 90 °. A hermetic compressor characterized by that.