JPH0117660Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] This invention relates to a hermetic compressor incorporated in an air conditioner, a refrigerator, etc., and particularly relates to an improvement in the muffler structure of a discharge muffler housed in the hermetic compressor. .

[Technical background of the invention and its problems]

A hermetic compressor installed in an air conditioner, refrigerator, or the like houses a compression mechanism that compresses refrigerant and discharges the compressed refrigerant into a refrigeration cycle.

The compression mechanism has a cylinder 1 shown in FIG. 1 and a piston (not shown) that slides inside the cylinder 1, and a valve cover 3 is attached to the outside of the cylinder 1 via a valve plate 2. A refrigerant suction chamber 4 and a discharge chamber 5 are defined within the valve cover 3.
Of these, the discharge chamber 5 is communicated with a discharge muffler 7 via a discharge and communication port 6 . By passing the discharged refrigerant from the discharge chamber 5 through each of the muffler chambers 7a to 7c for muffling of the discharge muffler 7, the pressure pulsation of the discharged refrigerant is kept small and the discharge pressure is smoothed.

Furthermore, many of the recent hermetic compressors are equipped with a high compression function, and as a result, the temperature of the discharged refrigerant tends to rise. Therefore, as shown in FIG. 2, the final stage 7 of the discharge chamber 5 and the discharge muffler 7
c is connected by an intermediate pipe 8, and the refrigerant discharged from the discharge chamber 5 is directly guided to the final stage of the discharge muffler 7, thereby reducing the temperature of the discharged refrigerant.

By the way, in the case shown in FIG. 2, a gap exists between the communication hole 9a bored in the muffler partition wall 9 and the intermediate pipe 8, so that each muffler chamber 7a to 7c is effectively closed to the muffler. This effectively suppresses pressure pulsations in the discharged refrigerant. However, since the diameter of the communicating hole 9a is larger than that of the inlet hole 9b, it is difficult to form each hole.

From this, as shown in Fig. 3, it is conceivable to reduce the pipe diameter of the intermediate pipe 8, but if the intermediate pipe 8 is reduced in diameter, the pressure loss of the flow will increase. This has led to problems such as a decrease in compressor performance.

[Purpose of invention]

Taking the above-mentioned circumstances into account, this design effectively prevents pressure loss due to intermediate pipes, and also allows for easy hole machining in the discharge muffler without increasing the pressure pulsation of the discharged refrigerant. The purpose is to provide a machine.

[Summary of the idea]

In order to achieve the above-mentioned object, the hermetic compressor according to the present invention has a discharge muffler that communicates the discharge chamber of the compression mechanism through an intermediate pipe with a plurality of stages of muffler chambers, and the intermediate pipe is connected to the muffler. In the case where the intermediate pipe is extended through a communication hole in a partition wall, the intermediate pipe is constricted near the muffler partition wall, and this constricted pipe portion is loosely fitted into the communication hole in the muffler partition wall and is connected to the muffler chamber of the next stage. It is open.

[Example of idea]

Hereinafter, preferred embodiments of this invention will be described with reference to the accompanying drawings.

Figure 4 is a partial diagram of a hermetic compressor that is incorporated into an air conditioner, refrigerator, etc., and the number 10 in the figure is
indicates a compression mechanism housed in a hermetic compressor. The compression mechanism 10 has a cylinder 11 and a piston (not shown), and a valve cover 13 is airtightly attached to the outside of the cylinder 11 via a valve plate 12. A suction chamber 14 and a discharge chamber 15 are defined within the valve cover 13. The suction chamber 14 is communicated with a suction pipe 17 via a plurality of stages of suction side muffler chambers 16 . The refrigerant sucked from this suction pipe 17 is guided to the suction chamber 14 via the muffler chamber 16,
The air is sucked into the cylinder chamber from this suction chamber 14.

On the other hand, the refrigerant discharged from the cylinder 11 into the discharge chamber 15 is guided from the discharge chamber 15 to the discharge muffler 19 via the intermediate pipe 18. Discharge muffler 19
There are multiple muffler chambers 20a, 20b, 20c inside.
is defined. Each muffler room 20a, 20b, 20
c is a communication hole 22 formed in the muffler partition wall 21
a, 22b, and this communication hole 22
The intermediate pipe 18 is inserted from the inlet 24 side so as to penetrate through a and 22b. The intermediate pipe 18 has a plurality of constriction structures according to the number of stages of the muffler chambers 20a, 20b, and 20c, and the inner diameter is gradually reduced toward the tip by the constriction at each stage. The base of the intermediate pipe 18 has the largest diameter, and is fitted and held in the inlet 24 from the outside. This inlet 24 communicates with the discharge chamber 15 via a discharge port 25 . Thus, the refrigerant discharged from the discharge chamber 15 is discharged from the discharge port 25 through the intermediate pipe 18 to the final stage muffler chamber 20c.

Further, the constricted portion of the intermediate pipe 18 is formed near the muffler partition wall 21, and the constricted pipe portion is loosely fitted into the communication holes 22a, 22b of the muffler partition wall 21.
Therefore, the outer diameter of the intermediate pipe 18 is smaller than the communication holes 22a and 22b of the muffler partition wall 21, and gaps δ ₁ and δ ₂ are formed between them to the extent that pressure pulsations of the discharged refrigerant do not become a problem. In this case, even if gaps δ ₁ and δ ₂ are formed between the intermediate pipe 18 and each of the communication holes 22a and 22b, since the intermediate pipe 18 has a tapered multi-stage constriction structure, each of the communication holes 22a and 22b
There is no need to make the diameter of the hole 2b larger than the diameter of the inlet 24, making hole machining easier.

Further, since the intermediate pipe 18 has a multi-stage constriction structure that tapers toward the tip, the length of the tip constriction pipe portion having the smallest diameter can be shortened. Therefore, when the discharged refrigerant in the intermediate pipe 18 flows, the flow path of the narrow diameter throttle pipe section is short, and pressure loss due to flow path resistance is small. Therefore, the discharged refrigerant is smoothly guided to the muffler chamber 20c at the final end.
The refrigerant guided to the muffler chamber 20c is subjected to a muffler action there, and is then discharged to a refrigeration cycle (not shown) through a discharge pipe 30. The discharge pipe 30 is connected to the final stage muffler chamber 20c.

In FIG. 5, the intermediate pipe 18 has outer diameters of the base and first stage throttle pipe parts 18a and 18b of d ₁ and d ₂ , and the final stage (second stage) throttle pipe part 18c opens into the final stage muffler chamber 20c. Although an example has been shown, the throttle pipe section 18c at the final stage may open into the muffler chamber 20b at the intermediate stage.

Further, as shown in FIG. 6, the discharge muffler 19A
The interior is divided into two stages of muffler chambers 32a and 32b, and both muffler chambers 32a and 32b communicate with each other through a communication hole 34 of a muffler partition wall 33, and the first stage muffler chamber 3
The intermediate pipe 18A may be constricted in two or more stages within 2a. In this case, the intermediate pipe 18
The base diameter d ₁ of A and the first stage throttle pipe diameter d ₂ may be the same diameter.

Furthermore, as shown in FIG.
B may be configured as an independent structure, and the intermediate pipe 18B connected to the discharge chamber 15 of the valve cover 13 may be airtightly connected to the discharge muffler 19B. In this case, the intermediate pipe 18B serves as a lead-out pipe and is airtightly connected to the valve cover 13 and the discharge muffler 19B by brazing.

The inside of the discharge muffler 19B is divided into two stages of muffler chambers 35a and 35b, similar to that shown in FIG. are doing. Further, the intermediate pipe 18B is connected to the muffler partition part 3.
It is narrowed near the communicating hole 6 and tapered toward the tip.

In addition, in the explanation of each embodiment of this invention,
Although an example has been described in which the intermediate pipe is narrowed in a stepped shape toward the tip, the narrowing structure is not limited to the stepped shape, and may be tapered.

[Effect of idea]

As described above, in the hermetic compressor according to this invention, the intermediate pipe communicating with the discharge chamber of the compression mechanism is constricted near the muffler partition wall, and this constricted pipe portion is connected to the communication hole of the muffler partition wall. Since the inside is loosely fitted and opens into the subsequent muffler chamber, there is no need to make the hole diameter of the communicating hole formed in the muffler partition wall larger than the diameter of the inflow port, making hole machining easy and manufacturing possible.

In addition, the intermediate pipe is constricted near the muffler partition wall, and this constricted pipe passes through the communication hole and opens into the next stage muffler chamber, so the length of the constricted small-diameter pipe is short. The pressure loss of the refrigerant can be reduced, the discharged refrigerant can be smoothly guided from the discharge chamber to the muffler chamber, and a decrease in the compressor capacity of the compressor can be effectively prevented.

Furthermore, the throttle pipe section of the intermediate pipe is loosely fitted into the communication hole of the muffler partition wall, and a gap is formed between the two and the communication hole, so each muffler chamber is communicated with each other through this gap, and the pressure pulsation due to the discharged refrigerant is effectively suppressed. A smooth discharge pressure can be obtained.

[Brief explanation of the drawing]

1 to 3 are views showing the discharge muffler structure in a conventional hermetic compressor, FIG. 4 is a partial plan view showing an embodiment of the hermetic compressor according to this invention, and FIG. A cross-sectional plan view showing the discharge muffler structure which is the main part of the hermetic compressor according to this invention, FIG. 6 is a diagram showing a first modification of this invention, and FIG. 7 is a diagram showing a second modification of this invention. It is a diagram. 10... Compression mechanism, 12... Valve plate,
13...Valve cover, 15...Discharge chamber, 18,
18A, 18B...middle pipe, 19, 19A,
19B...Discharge muffler, 20a, 20b, 20
c, 32a, 32b, 35a, 35b...muffler room, 21, 33, 36...muffler partition wall, 22
a, 22b, 34, 37... Communication hole.

Claims (1)

[Claims for Utility Model Registration] 1. A discharge muffler that communicates the discharge chamber of the compression mechanism through an intermediate pipe forms a multi-stage muffler chamber, and the intermediate pipe extends through a communication hole in a muffler partition wall. In the hermetic compressor, the intermediate pipe is throttled near the muffler partition wall, and the throttle pipe portion is loosely fitted into the communication hole of the muffler partition wall and opens into the muffler chamber of the next stage. Hermetic compressor. 2. The intermediate pipe has a multistage constriction structure so that the inner diameter gradually decreases toward the tip, and the constriction portion of each stage is the closed type described in claim 1 of the utility model registration claim, in which the constriction portion of each stage is formed near the muffler room partition wall. compressor.