JPH0448945B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to an improvement in a silencer for a compressor, and in particular to a separator made of synthetic resin with excellent heat insulation properties and capable of supplying low-temperature refrigerant gas into a cylinder. Regarding a type suction silencer.

(B) Prior art It is well known that in general, separate suction mufflers in refrigerant compressors are preferably made of synthetic resin, which has heat insulating properties and is lightweight, in order to prevent heating of the refrigerant gas flowing into the muffler. However, in this separate type suction muffler made of synthetic resin, it is better to form the communication pipe that guides the refrigerant gas inside the muffler into the cylinder into a substantially U-shape due to the arrangement of each component of the compressor. Since the muffler can be stored more compactly, there has been a strong desire to develop a suction muffler in which the U-shaped communication tube is integrally molded with synthetic resin. Here, in the manufacturing method of a suction muffler in which a U-shaped communicating pipe is integrally molded with synthetic resin, the simplest cutting die method is to divide the communicating pipe into two along a plane containing the axis and join each vessel body. This is the way to do it. However, according to the above method, there is a problem that a seam is formed in the U-shaped communication pipe in its axial direction, and when this communication pipe is inserted into the cylinder, refrigerant gas leaks from the seam, impairing the function of the suction muffler. It was hot.

(c) Summary of the Invention The present invention solves the above problem, and includes a substantially U-shaped communicating pipe with a straight intermediate portion and a suction tail pipe integrally formed in one body made of synthetic resin. However, the communicating pipe is provided with a hole located on the wall surface closer to the vessel body than the intermediate part and facing the passage in this intermediate part, and this communicating pipe is formed smoothly without any joints, so that the flow of the refrigerant flowing inside this communicating pipe is smooth. It is an object of the present invention to provide a noise muffling device for a compressor, in which a resonant muffler can be formed using a partition plate within a suction muffler.

The present invention comprises a compression element housed in a sealed container, a cylinder, a valve seat attached to an end face of the cylinder, and a separate suction muffler made of synthetic resin that guides refrigerant gas into the cylinder, This separate type suction muffler is divided into a first container body and a second container body,
It is composed of a partition plate held between the first container body and the second container body, a hole is provided in the partition plate to communicate between the first container body and the second container body, and this partition plate is provided with a hole that communicates between the first container body and the second container body. One of the vessels is integrally provided with a suction tail pipe that guides the refrigerant into the one vessel, and a communication pipe that communicates with the cylinder.
This communicating tube has a hole located on the wall surface closer to the vessel body than the middle part and facing the passage in the middle part, and this hole has a size larger than the inner diameter of the middle part. It was formed in

(d) Embodiments of the invention The present invention will be described below based on embodiments shown in the drawings.

Reference numeral 1 denotes a hermetic electric compressor which houses an electric element 4 and a compression element 5 connected by a rotating shaft 3 in a hermetically sealed case 2. Reference numeral 6 denotes lubricating oil stored at the bottom of the closed case 2. The compression element 5 includes a cylinder 9 fixed to the motor case 7 with a fixing bolt 8, a piston (not shown) sliding inside the cylinder,
A cylinder head 13 comprising a valve seat 10 having a suction valve and a discharge valve (none of which are shown) installed to close the opening of the cylinder 9, a head plate 11, and a discharge muffler 12.
It consists of Reference numeral 14 denotes a separate type suction noise muffler which is integrally formed with a substantially U-shaped communication pipe 15 made of synthetic resin and whose intermediate portion 15a is straight, which is fitted into a hole in the head plate 11 so as to directly communicate with the inside of the cylinder 9. It is a vessel. Reference numeral 16 denotes a suction pipe that penetrates and is fixed to the sealed case 2 from the outside.

Therefore, a separate type suction muffler 14 made of synthetic resin
is 2 on the plane that intersects the axis of the U-shaped communication pipe 15.
Divided into a first vessel body 14a and a second vessel body 14b
It is composed of. First, the first vessel body 14a
The suction tail pipe 1 has a U-shaped communication pipe 15, a locking part 17 for attachment to the cylinder 9, and a collar part 18.
9 and the oil fence 20 are integrally molded. 21 is 3 of the jig pins 33, 34, 35 for forming the communication pipe 15 as shown in FIG.
3 is an insertion hole into which the cap 21 is inserted, and this insertion hole 21 is closed with a cap 22. Reference numeral 23 denotes a stepped portion provided at the opening 24 of the first vessel body 14a, and this stepped portion 23 includes a separate communication hole 25 for forming the resonance silencing chamber 32 and a reservoir in the resonant silencing chamber 32. A partition plate 27 having oil holes 26 for discharging ivy oil is positioned. The oil hole 26 functions to maintain the volume of the resonance silencing chamber 32 and maintain the silencing effect, as shown in FIG. 5. On the other hand, oil fences 28 and 29 are integrally molded on the second vessel body 14b. The opening 30 of the second vessel body 14b has a double wall structure, and the first vessel body 14a is inserted into the groove between the double walls.
The partition plate 27 positioned in the stepped groove 23 of the first container body 14a is supported and fixed by the inner wall 31 of the double wall. Further, the suction tail pipe 19 has its opening 19a cut diagonally to form the opening 1 of the suction pipe 16, as shown in FIG.
The suction tail pipe 19 is shaped so that the 6a are parallel to each other to smooth the flow of the refrigerant and to
The distance L between the opening 19a of the intake pipe 16 and the opening 16a of the suction pipe 16
is made sufficiently short to improve the suction capacity of the suction muffler 14. Here, the distance ₁ between the suction tail pipe 19 and the sealed case 2 is long enough to prevent resonance of suction pulsation noise, and the protrusion length ₂ of the suction pipe 16 into the sealed case 2 is long enough to prevent collision with the electric element 4. The structure is designed to be sufficiently short for this purpose. The separate type suction muffler 14 made of synthetic resin includes the first body 14 as described above.
a and the second container body 14b through their respective openings 24 and 3.
0, and the partition plate 27 connects the second container body 14.
The resonant silencing chamber 32 is molded on b and is bonded with adhesive or the like.

In the compressor silencer configured as described above, the operation of the separate suction muffler 14 made of synthetic resin will be described. A so-called semi-direct suction system is configured in which the opening 19a of the suction tail pipe 19 is placed close to the opening 16a of the suction pipe 16, and relatively low-temperature refrigerant gas is sucked into the suction muffler 14. There is. The refrigerant gas sucked from the suction tail pipe 19 passes through the first body 14a and reaches the head plate 1.
1 directly flows into the cylinder 9 from the U-shaped communication pipe 15 fitted into the cylinder 1, but at this time, the resonant silencing chamber 3 formed in the second vessel body 14b by the partition plate 27
2, the sound is muted. In addition, oil fences 20, 28, 29 integrally formed on the respective vessels 14a, 14b are used to prevent lubricating oil 6, which is sprayed from the jet hole 3a at the upper end of the rotary shaft 3, into the motor case in order to cool the compression element 25. This is to prevent oil from being sucked in from the suction tail pipe 19 of the suction muffler 14 through the suction muffler 14, and to reduce the amount of oil discharged. Furthermore, the flange 18 provided on the suction tail pipe 19 allows the lubricating oil 6 scattered from the jet hole 3a at the upper end of the rotating shaft 3 to be sucked from the suction tail pipe 19 through the main body of the suction muffler 14. prevent
Lubricating oil 6 is dripped onto the bottom of the sealed case 2.

(E) Effects of the Invention As described above, according to the present invention, a compression element housed in an airtight container is combined with a cylinder, a valve seat attached to an end face of the cylinder, and a composition for guiding refrigerant gas into the cylinder. It is composed of a separate type suction muffler made of resin, and the separable type suction muffler is sandwiched between a first container body and a second container body, and between the first container body and the second container body. The partition plate is provided with a hole that communicates between the first container body and the second container body, and a suction device is provided in which the refrigerant is introduced into one of the container bodies. A tail pipe and a communication pipe communicating with the cylinder are integrally provided, and this communication pipe is formed of a substantially U-shaped tube with a straight middle part, and this communication pipe has a wall surface closer to the vessel body than the middle part. A hole is provided facing the passage in the middle part, and the hole is formed to have a size larger than the inner diameter of the middle part, so that the U-shaped communicating pipe can be seamlessly integrated with the vessel body. Since it is made of resin, the refrigerant can flow smoothly through the communication pipe, and the separate suction muffler can be compactly stored in the compressor. Moreover, in the present invention, since the communication tube and the suction tail pipe are provided on one side of the container body that holds the partition plate, the other container body partitioned by the partition plate acts as a resonance muffling chamber, and the suction muffler expands. It has a type muffler effect and a resonance type muffler effect, and can reduce the noise of the suction refrigerant.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a hermetic electric compressor showing an embodiment of the present invention, Fig. 2 is a plan view showing a separated suction muffler in an exploded state, and Fig. 3 is a front view of the separable suction muffler. Figure 4 is a plan sectional view showing a method for manufacturing a U-shaped communication pipe, Figure 5 is a sectional view of the main parts of a separate type suction muffler, and Figure 6 is an explanatory diagram of the main parts of a hermetic electric compressor. It is. 1... Hermetic electric compressor, 5... Compression element, 9
... Cylinder, 14 ... Separate suction silencer, 14
a...First vessel body, 14b...Second vessel body, 15
...Communication pipe.

Claims (1)

[Scope of Claims] 1. A system comprising a closed container and a compression element housed in the container, the compression element including a cylinder, a valve seat attached to an end face of the cylinder, and a refrigerant gas supplied into the cylinder. In a compressor muffling device having a separate type suction muffler made of synthetic resin, the separable type suction muffler has a first container body, a second container body, and a first container body and a second container body. and a partition plate sandwiched between the two vessel bodies, the partition plate is provided with a hole that communicates the first vessel body with the second vessel body, and one vessel body is provided with a hole that communicates with the first vessel body and the second vessel body. A suction tail pipe that guides the refrigerant into the container body and a communication pipe that communicates with the cylinder are integrally provided, and this communication pipe is a substantially U-shaped pipe with a straight middle section. is provided with a hole located on the wall surface closer to the vessel body than the intermediate portion and facing the passage in the intermediate portion, this hole is formed in a size larger than the inner diameter of the intermediate portion, and this hole is closed with a cap. A compressor silencer characterized by: 2. A silencer for a compressor according to claim 1, characterized in that a flange is provided on the suction tail pipe. 3. A silencer for a compressor according to claim 1, characterized in that an oil fence is integrally formed in the first container body. 4. A silencer for a compressor according to claim 1, characterized in that an oil fence is integrally formed in the second container body. 5. The silencer for a compressor according to claim 1, wherein an oil fence is integrally formed in the first container body and the second container body.