JPS59218373A - Compressor with silencer - Google Patents

Abstract

PURPOSE:To provide ease with which a smaller-sized silencer of a compressor is installed by mounting a silencing cover which includes a silencing space integrally on a compressor housing and forming throttles between discharge passages and the silencing hollow. CONSTITUTION:A silencing cover 27 defines a silencing space 29 therein at the part opposed to a discharge passage 25 and has a discharge and communication passage 30 formed therein which at one end communicates with the silencing space 29 and at the other end communicates with a capacitor. Each communication hole 32 which connects the discharge passage 25 and the silencing space 29 to each other has a small diameter in comparison with the diameter of a suction passage 25 in order to throttle flow in the discharge passage. Since the silencing cover 27 and the communication plate 26 are integrally mounted on a housing, the entire silencing mechanism may be made small.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a compressor for compressing refrigerant, and is particularly effective for use in automobile air conditioners.

In recent years, there has been an increasing demand for quiet interiors of automobiles, and it has therefore become desirable to reduce the discharge pulsation noise of compressors for automobile air conditioners.

Therefore, as shown in Fig. 1, a surge tank 1, which has a large sound-dampening space in the middle of the piping on the discharge side of the compressor, has been developed.
It has been considered to install a However, since the volume of the surge tank 1 is large, the installation work in the engine room becomes very complicated, and there is a problem that the ease of assembly becomes poor.

The present invention has been devised in view of the above points, and it is possible to form a compact silencing space by integrally attaching a silencing cover having a silencing space to a compressor housing, and to provide a special method for installing a silencing device. The purpose is not to use processes.

Next, one embodiment of the present invention will be described based on the drawings.

Reference numeral 2 in FIG. 1 denotes a shaft which is rotated by receiving the driving force of an automobile engine through an electromagnetic clutch (not shown). 3
is a housing that supports this shaft via a bearing 4, and has five cylinder portions 6 that support pistons 5 inside. A swash plate 7 is fixed to the shaft 2 by fixing bolts 8, and this swash plate 7 is supported in the axial direction by the housing 3 via a bearing 9. Further, a piston 5 is connected to the swash plate via a ball 10, so that the piston 5 reciprocates within the piston 6 as the swash plate 7 rotates. Therefore, the working space 16 formed between the piston 5 and the cylinder part 6
changes its volume in accordance with the displacement of the piston 6.

Reference numeral 11 denotes a front housing connected to the front side of the housing 3 via an O-ring 12, and has a suction chamber 13 inside.
and a discharge chamber 14. A valve plate 5 is interposed between the front housing 11 and the housing 3, and this valve plate 15 has a suction chamber 13 and an operating chamber 16.
The suction hole 17 connecting the working chamber 16 and the discharge chamber 14 are open. A shaft sealing device 23 is disposed between the front housing 11 and the shaft 2, and the shaft sealing device 23 prevents the refrigerant inside the compressor from leaking outside along the shaft 2. On the other hand, a rear housing 19 is connected to the rear side of the housing 3 via an O-ring 20, and has a suction chamber 21 and a discharge chamber 22 inside. A valve plate 15 is interposed between the rear housing 19 and the housing 3, and the bracketed valve plate 15 has a suction hole 17 that connects the suction chamber 13 and the working chamber 16, and a suction hole 17 that connects the working chamber 1G and the discharge chamber 4. The discharge hole 18 is open.

A suction passage 1/824 and a discharge passage 25 are opened in the front housing 3, and a suction passage chamber connecting the suction passage 24 and the suction chamber 23, and a discharge chamber 1 are provided in the housing 3.
A discharge passage chamber connecting the discharge passage 25 and the discharge passage 25 is formed. Suction passage 24. A sound deadening cover 27 is attached to the upper part of the discharge passage 25 via a communication plate 26 (ffi3).
(Illustrated) In addition, a suction service valve 28 and a refrigerant suction hole 28a through which refrigerant is introduced from an evaporator (not shown) are formed in the noise-muffling cover at the same time. The introduced refrigerant is guided from the suction passage 24 to the suction chamber 13 via the suction passage chamber.

A silencing space 29 is formed in a portion of the silencing cover that faces the discharge passage 25 .

In addition, a discharge communication passage 30 is formed in the noise reduction cover 27 and communicates with the noise reduction space 29, and this passage 30 communicates with the contents (not shown) through piping.
A seal packing 31a is interposed between the muffling cover 27 and the communication plate 26, and a seal packing 31b is interposed between the communication plate 26 and the housing 3, and in this state the muffling cover 27 is fixed to the housing 3 with bolts. In addition, 4. '5
．． Figure 6 shows the communication plate 26, and 32 in the figure is the discharge passage 1182.
A communication hole 33 connects the suction service valve 28 and the suction passage 23. The diameter of the communication hole on the discharge side is smaller than the diameter of the suction passage 25 (for example, about 2 to 1511 II) so that the flow of the refrigerant passing through the discharge passage 25 can be restricted. The ratio (expansion ratio) of the cross-sectional area a of the communication hole 32 to the cross-sectional area of the silencing space is about 50 times. Also, Section 7.8.9
The figure shows the sound deadening cover 27, and in the figure 34 is a bolt through hole, through which the cover 27 is bolted to the housing. Further, radiating fins 35 are formed on the outer surface of the sound deadening space 29 and are used to accelerate cooling of the discharged refrigerant on the discharge side.

Next, the operation of the compressor having the above configuration will be explained.

When an electromagnetic clutch (not shown) is engaged and the driving force of the automobile engine is transmitted to the shaft 2, the shaft 2 rotates within the housing 3, and the piston 5 reciprocates within the cylinder portion 6 in accordance with the rotation.

As the volume of the working chamber 16 changes due to this reciprocating movement, the refrigerant introduced from the suction service valve 28 is sucked into the working chamber 16 through the suction chamber 13 when the volume increases. Next, as the volume of the working chamber 16 decreases, the refrigerant is compressed and discharged from the discharge port 18 into the discharge chamber 14 .

Thereafter, the refrigerant is discharged from the discharge passage chamber to the silencing space 29 via the discharge passage 25. The refrigerant flows through the communication hole 3 of the communication plate 26.
2 to the silencing space 29, the volume rapidly expands, and this expansion can reduce the discharge pulsation noise. That is, since refrigerant is intermittently discharged from the working chamber 16 into the discharge chamber 14.22, the flow of the refrigerant passing through the discharge passage 25 also becomes intermittent, and if this flow is directly led to the condenser side, This will generate noise due to pulsation in the pipes, etc. However, in this example, the refrigerant that has passed through the discharge passage 25 is once throttled in the communication hole 32 and then rapidly expanded in volume in the silencing space 29, so the pulsation can be significantly reduced. Therefore, the noise generated in the piping etc. is significantly reduced. FIG. 10 shows the effect of noise reduction by this noise reduction space. In this example, since the expansion ratio is about 5G, it is possible to absorb pressure fluctuations of about 20 decibels.

Moreover, in this example, since the sound deadening cover 27 and the communication plate 26 are integrally attached to the housing 3, an additional space for installing the sound deadening device is required (and the overall volume is compact). At the same time, since the silencing space 2.9 is integrally attached to the compressor, there is no need for a special process for installing a silencing device.Furthermore, in this example, the silencing cover 27 has an intake service valve 28 and Since the discharge service hole 30 is integrally formed, piping can be easily connected.

However, the present invention 1jJl has various responses other than the illustrated example.

As shown in Figure 11.12, the discharge cover 27
may be installed further outside the rear housing 19. In this case, the discharge passage 25 and the muffling cover 27 are connected by a discharge pipe 36. Note that 37 in the figure is a discharge communication pipe that communicates with the condenser side via piping. Also in this example,
The muffling cover 27 is fixed to the rear housing 19 by a port 39 via an O-ring 38.

Further, in the above example, only one communication hole 32 on the discharge side is formed in the communication plate 26, but if necessary, a plurality of communication holes 32 with a smaller diameter (for example, about 1 mm) may be provided. Further, in the above example, the communication plate 26 and the sound deadening cover 27 are formed separately, but the communicating hole 32 may be provided integrally with the sound deadening cover 27 as shown in FIGS. 13 and 14.

Further, in the above example, the communication hole 32 forming the constriction part was provided separately from the housing, but it may be provided within the housing 3. In this case, it is formed in a part of the communication passage 25 of the housing 3.

Further, although the above example shows a swash plate type compressor, the compressor according to the present invention can be applied to other types, such as a vane type compressor, a reciprocating type compressor, etc.

As explained above, in the compressor of the present invention, since the discharge cover is integrally attached to the compressor housing, it has an excellent effect that the silencer can be easily installed.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a conventional silencer, FIG. 2 is a sectional view showing an embodiment of the compressor of the present invention, and FIG. 3 is a side view of FIG. 1, partially in section. Figure 4 is a front view of the slope shown in Figure 2, Figure 5 is a side view of the slope shown in Figure 2, and Figure 6 is a side view of the slope shown in Figure 2.
The figure is a rear view of the ff32 diagram showing communication, Figures 7 to 9 are a plan view, sectional view, and front view of the sound deadening cover shown in Figure 2, respectively, and Figure 10 shows the silencing effect of the sound deadening chamber shown in Figure 2. The explanatory diagram, FIG. 11, is a sectional view showing a main part of another embodiment of the compressor of the present invention, and FIG. 12 is a side view of FIG. 11. FIG. 13 is a plan view showing essential parts of another embodiment of the compressor of the present invention, and FIG. 14 is a front view of FIG. 13. 2... Shaft, 3... Housing, 1G... Working chamber, 27... Sound deadening cover, 29... Sound deadening space, 3
2...Communication hole forming the aperture part. Representative Patent Attorney Takashi Okabe Figure 1 1 JP-A-59-218373 (4) Figure 3 Figure 4 Figure 5 Figure 7 Figure 1 Figure 6 Figure 81N Figure 9 30 Expansion ratio i'is Figure 11 Figure 12 Figure 13 Figure 14

Claims (1)

[Claims] A shaft that rotates in response to the driving force from the automobile engine; a working chamber that changes volume according to the rotation of the shaft; a suction hole that supplies refrigerant to this working chamber; and a discharge that discharges refrigerant from the working chamber. a housing having a hole;
A sound deadening cover that covers the discharge hole and has a sound deadening space inside, and a discharge pipe that is provided on the cover and leads out the refrigerant in the sound deadening space to the outside, and a constriction part is provided between the discharge passage and the sound deadening space. Compressor with built-in silencer.