JPH0754634Y2 - Scroll compressor - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a scroll compressor suitable for use as a refrigerant or air compression in a refrigeration system, an air conditioner, or the like.

[Conventional technology]

Conventional scroll compressors of this type are disclosed in
There is known one having a configuration shown in Japanese Patent No. 61-261693. That is, in this conventional scroll compressor, an orbiting scroll is combined below the fixed scroll, and the orbiting scroll is made to oscillate from below by a drive shaft of an electric motor, and is formed by spiral protrusions of both scrolls. The gas is compressed in the compression chamber. Further, the high-pressure gas compressed in this way is configured to pass through the shell from the discharge port at the center of the fixed scroll by the discharge pipe and be discharged to the outside via the discharge muffler. Then, by discharging the high-pressure gas compressed in this way to the outside through the discharge muffler,
It is possible to solve problems that have been often problematic in the past, such as vibration and noise problems through the pipe due to pressure pulsation in the discharge pipe, and start-up failure due to abnormal pressure rise due to a kind of liquid clogging phenomenon at the time of intake start-up. Met.

However, in such a conventional structure, the orbiting scroll rotates due to the pressure difference between the high pressure portion on the discharge port side and the low pressure portion on the suction port side in the fixed scroll immediately after the compressor is stopped,
The noise generated at this time was regarded as a problem.

In order to solve such a problem, a scroll compressor as shown in FIG. 2 has been conventionally proposed. To briefly explain this, in the figure, reference numeral 1 is a fixed scroll, 2 is an orbiting scroll which forms a scroll-shaped compression chamber 3 by being combined with the fixed scroll, and each of these scrolls 1 and 2 is a scroll base plate 1a. , 2a and scroll-shaped spiral projections 1b, 2b provided in a protruding manner on the inner surfaces facing each other. Reference numeral 4 denotes an intake port provided on the outer peripheral side of the compression chamber 3 on the outer peripheral portion of the fixed scroll 1, and reference numeral 5 denotes an outlet provided on the central portion of the fixed scroll base plate 1a.

Reference numeral 6 denotes a main shaft on which the orbiting scroll shaft 2c of the orbiting scroll 2 is eccentrically fitted via a bearing.
Through the lower bearing, which are connected to each other by spigot,
It is pivotally supported by the lower bearing frames 7 and 8. Reference numeral 9 denotes a motor rotor which is provided on the main shaft 6 below the lower bearing frame 8 and constitutes a motor for rotationally driving the main shaft 6, 10 denotes a motor stator thereof, and the rotor 9 has a main shaft 6 and a stator 10. Is fixed to the bearing frame 8 by press fitting, baking, screwing, or the like. Further, these constituent members are housed in a hermetically sealed shell 11 and arranged at required positions. In the figure, 12 is the orbiting scroll 2,
An Oldham coupling arranged between the bearing frames 7 for preventing the orbiting scroll 2 from rotating, 13 is an oil reservoir provided at the bottom of the shell 11, 14 is a refrigerant gas suction pipe provided at the side of the shell 11, and Reference numeral 15 is a discharge pipe connected to the discharge port 5, 16 is a discharge pipe, and a discharge muffler 17 is provided in the middle of the discharge pipe 16.

18 is the discharge port 5 mounted on the fixed scroll base plate 1a.
A check valve that allows compressed gas to be discharged from the movable spring plate 18
It is composed of a, a bolt 18b and a receiving plate 18c. 19
Is a valve cover fixed to the fixed scroll 1 side with a bolt 19a so as to cover the check valve 18.
Is airtightly attached to the fixed scroll base plate 1a via the packing 19b, and the discharge pipe 1 via the seal material 15a.
The inner end of 5 is fixed airtightly.

The fixed scroll 1 described above is fixed to the bearing frame 7 by screws or the like, and the orbiting scroll 2 is engaged with the fixed scroll 1 while the shaft 2c is fitted to the main shaft 6.

In such a configuration, when the main shaft 6 is rotated by the driving of the motor rotor 9 and the orbiting scroll 2 is oscillated, the negative pressure generated by this causes the gas from the outside to be sucked from the suction pipe 14, and the solid line in the figure. Shell 11 as shown in
It passes through the low pressure part inside and enters the compression chamber 3 from the suction port 4. Then, the volume of the sucked gas is gradually reduced in the formed compression chamber, becomes high-pressure gas, and is discharged as high-temperature, high-pressure gas from the discharge port 5, and is discharged into the discharge valve 18, the discharge pipe 15, and the discharge muffler 17. Is discharged to the outside through a discharge pipe 16 having
In this case, by providing the above-described check valve 18, it is possible to prevent the backflow of the working fluid from the high pressure portion to the low pressure portion immediately after the compressor is stopped.

[Problems to be solved by the invention]

However, in the conventional scroll compressor described above,
When the check valve 18 is provided on the discharge port 5 of the fixed scroll 1, a valve cover 19 covering the part and a mounting bolt thereof.
19a and packing 19b, as well as the sealing material 15a between the discharge pipe 15 and the valve cover 19 are required, the number of component parts is large, the work process increases, and there is a big problem in terms of assembly workability. It is desired to take some measures that can eliminate such problems.

The present invention has been made in view of the above-mentioned circumstances, and in mounting the valve cover for the check valve on the discharge port portion of the fixed scroll base plate, the structure is simplified and the assembly workability is reduced. It is an object of the present invention to obtain a scroll compressor that can achieve cost reduction.

[Means for solving problems]

In order to meet such a demand, a scroll compressor according to the present invention is provided with a spiral protrusion which is combined with an orbiting scroll side in a shell to form a compression chamber, and a spiral protrusion provided on an inner surface of the shell and having a central discharge port. A fixed scroll composed of a base plate formed in the portion, a valve mechanism provided at the discharge port of the fixed scroll base plate for preventing the working fluid from moving from the high pressure side to the low pressure side, and this valve mechanism And a valve cover provided so as to connect between the discharge port portion of the fixed scroll base plate and the discharge pipe outside the shell, and surrounds the periphery of the discharge port and the valve mechanism on the outer surface of the fixed scroll base plate. In this way, the annular projection is projected, and the valve cover is assembled by fitting the one end opening to the annular projection in an airtight state and the other end opening penetrating the shell in an airtight manner to the discharge pipe. Shaped to be connected with the side Those formed by having been deep drawing the.

[Action]

According to the present invention, the valve cover that covers the valve mechanism provided at the discharge port portion of the fixed scroll base plate is formed of a sheet metal member by deep drawing, and the one end opening is formed on the fixed scroll base plate side. Discharge side from the discharge side to the discharge pipe outside the shell by fitting the annular projection in the airtight state and penetrating the shell in the other end opening in the airtight state and connecting the discharge pipe to the outer end The flow path can be easily and properly constructed.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings.

FIG. 1 shows an embodiment of the scroll compressor according to the present invention. In the figure, the same or corresponding parts as those in FIG. 2 described above are designated by the same reference numerals and the description thereof will be omitted.

According to the present invention, the annular projection 20 is projected on the outer surface of the fixed scroll base plate 1a opposite to the spiral projection 1b so as to surround the discharge port 5 and the check valve 18 as a valve mechanism. At the same time, the one end opening 22a is fitted in the annular projection 20 via the sealing material 21 in the airtight state, and the other end opening 22b penetrates the shell 11 in the airtight state and is connected to the discharge pipe 16 side. It is characterized in that the valve cover 22 having the above-mentioned shape and having an integral structure made of a sheet metal material formed by deep drawing is provided. Here, the sealing material 21
Is a large-diameter one-end opening of the valve cover 22 that is loaded in an annular groove formed in the inner peripheral portion of the distal end side of the annular protrusion 20 on the base plate 1a side and is fitted into the annular protrusion 20 in a fitted state. It is configured to seal the portion 22a in an airtight state. Further, the other end opening 22b side of the valve cover 22 is narrowed to a small diameter as apparent from the drawing, penetrates a through hole formed on the shell 11 side, and protrudes outside the shell. In addition, the lead-out portion of the valve cover 22 from the shell 11 is joined in an airtight state by means such as projection welding,
Also, the other end opening 22b is connected to the discharge pipe 1 by means such as brazing.
Connected with 6.

And according to such a configuration, the fixed scroll base plate
A valve cover 22 that covers the check valve 18 provided in the discharge port 5 portion of 1a and forms a high-pressure chamber on the discharge side is formed of a sheet metal member by deep drawing, and one end opening 22a thereof has a fixed scroll. By fitting in the annular projection 20 on the base plate 1a side in an airtight state and penetrating the other end opening 22b in the airtight state through the shell 11 and connecting to the discharge pipe 16 side, the shell is discharged from the discharge port 5
11 It is possible to easily and properly configure the discharge side flow path to the discharge pipe 16 outside, and there are many component parts including conventional bolts, packing, etc., which causes problems in assembly workability and cost. It is possible to eliminate such troubles.

Further, according to the valve cover 22 described above, only by being fixed to the shell 11 by welding, it is vertically movably fitted to the fixed scroll base plate 1a side annular projection 20 side, and the other end opening. Since the portion 22b is directly led out of the shell 11,
The whole hermetic assembly is very easy. Then, in such a configuration, even if the valve cover 22 is displaced upward due to high pressure due to the discharge gas, for example,
There is no problem such as the base plate 1a of the fixed scroll 1 being pulled and deformed, which is excellent in practical use.

It should be noted that the present invention is not limited to the structure of the embodiment described above, and the shape, structure, etc. of each part of the scroll compressor can be freely modified and changed, and various modifications such as the shape of the valve cover 22 are possible. Conceivable.

[Effect of device]

As described above, according to the scroll compressor of the present invention, the spiral protrusion that is combined with the orbiting scroll side in the shell to form the compression chamber, and the spiral protrusion that protrudes on the inner surface and has the discharge port in the central portion. A fixed scroll composed of a base plate formed on the base plate, a valve mechanism provided at the discharge port of the fixed scroll base plate for preventing the working fluid from moving from the high pressure side to the low pressure side, and via this valve mechanism A valve cover provided so as to connect between the discharge port portion of the fixed scroll base plate and the discharge pipe outside the shell, and surrounds the discharge port and the valve mechanism on the outer surface of the fixed scroll base plate. Thus, the annular cover is projected, and the valve cover is assembled by fitting the opening at one end into the annular projection in an airtight state and the opening at the other end through the shell in an airtight state. To be connected to the piping side Since forming by deep drawing with a shape, in spite of the simple construction, achieve a practically various excellent effects as described below.

That is, according to the present invention, the discharge side flow path from the discharge port to the discharge pipe outside the shell can be configured by a simple valve cover including the high pressure chamber for operating the valve mechanism. Compared with this, the number of constituent parts can be significantly reduced and the assembling workability can be improved.

Further, according to the present invention, the valve cover can be formed by deep drawing a simple sheet metal member, which has an advantage that the manufacturing cost can be significantly reduced.

Further, according to the present invention, the valve cover is movably connected to the fixed scroll base plate at the fitting portion of the annular protrusion, and the valve cover may be displaced upward due to high pressure due to, for example, discharge gas. However, this base plate is excellent in practical use without any problems such as being pulled and deformed. Further, according to the present invention, by interposing a seal material in the fitting portion between the valve cover and the annular protrusion, as described above,
It is possible to easily obtain an airtight state, and in this case there is no problem that the pressing force etc. due to the interposition of the sealing material acts on the fixed scroll base plate side, and there is no hindrance in operation as a scroll compressor. It also has the advantage.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a scroll compressor according to the present invention, and FIG. 2 is a vertical sectional view showing a conventional example. 1: Fixed scroll, 1a: Fixed scroll base plate, 1b
...... Swirl projections, 2 ...... Oscillatory scrolls, 3 ...... Compression chambers,
5 ... Discharge port, 6 ... Spindle, 11 ... Shell, 16 ... Discharge piping, 17 ... Discharge muffler, 18 ... Check valve, 20 ... Annular protrusion, 21 ... Sealing material, 22 ... … Valve cover.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Naohiro Maeda 6-5-6 Tehira, Wakayama, Wakayama Sanryo Electric Co., Ltd. (56) Reference JP-A-55-35151 (JP, A) Actual development Sho 61-76187 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A spiral projection that is combined with an orbiting scroll side in a shell to form a compression chamber, and a base plate formed by projecting the spiral projection on an inner side surface and by forming a discharge port in a central portion. And a valve mechanism provided at the discharge port of the fixed scroll base plate for preventing the working fluid from moving from the high pressure side to the low pressure side, and the discharge port part of the fixed scroll base plate through the valve mechanism. And a valve cover provided so as to connect between a discharge pipe outside the shell and an annular protrusion that surrounds the periphery of the discharge port and the valve mechanism on the outer surface of the fixed scroll base plate. And the valve cover, one end opening is fitted into the annular projection in an airtight state, and the other end opening penetrates the shell in an airtight state to the discharge pipe side. Shape to connect with A scroll compressor characterized by being formed by deep drawing.