JPS63173884A - Scroll compressor - Google Patents

Abstract

PURPOSE:To damp down the pulsation of discharge and improve the operating property of assembling by fitting a discharge muffler to the outer periphery of an annular projecting part provided on a fixed scroll to form a high pressure chamber while providing said muffler and a seal draw-out terminal on an upper container. CONSTITUTION:An annular projecting part 31c surrounding a discharge port 6 is provided on the top of a fixed scroll 31. And, a discharge muffler 34 consisting of a top end plate part and a cylinder part 34a and with an open bottom is airtightly and vertically movably fitted in an annular groove 31d provided on the outer periphery of the annular projecting part 31c via a packing 35, thereby, forming a high pressure chamber 36, to which a discharge pipe 20 is connected. On the other hand, the discharge muffler 34 is airtightly connected to the upper center of an upper container 33 which is airtightly connected to a lower container 32, while airtightly connecting a seal draw-out terminal 20 to the upper container 33. Thereby, the pulsation of discharge can be damped down, preventing abnormal rise in pressure at the time of starting during asleep, while improving the operating property of assembling.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a scroll compressor used for compressing refrigerant or compressing air in refrigeration equipment, air conditioning equipment, etc.

[Conventional technology]

As a conventional scroll compressor, for example, JP-A-60-2
There is one disclosed in Japanese Patent No. 06988. This conventional scroll compressor is constructed in a general manner. An oscillating scroll is combined below the fixed scroll, and this oscillating scroll is oscillated from below by a drive shaft by a TM machine, so that gas is compressed in a compression chamber formed by the spiral protrusions of both scrolls. ing. This compressed high-pressure gas is discharged and supplied to the outside through the upper container through a discharge pipe from a discharge hole in the center of the fixed scroll.

However, with this conventional compressor, when used in refrigeration equipment or air conditioners, the gas is compressed in the compression chamber, reaches the final pressure (uniquely determined by the suction pressure), and then is discharged from the discharge pipe and sent to the condenser. (not shown). If the condensing pressure at this time differs from the final pressure above, overcompression or undercompression will occur, causing pressure pulsations in the discharge pipe and vibrations through the discharge pipe.

It was causing noise.

Furthermore, when a refrigerant liquid is sucked into the suction chamber formed between both scrolls during sleep startup, a type of clogging phenomenon due to the viscous resistance of the liquid occurs in the discharge pipe, causing a temporary abnormal pressure increase in the discharge pipe. There were times when startup problems occurred.

In order to solve these problems, a scroll compressor shown in FIG. 2 has been proposed. In the figure, l/l
i is a fixed scroll, and the disk part a has a spiral protrusion 1 downward.
b, and a discharge hole 6 is bored in the center. 2 is an oscillating scroll corresponding to the fixed scroll 1 from below, and a spiral protrusion 2b is provided above a disk portion 2a.
It is combined with the spiral protrusion 1b, and a protruding shaft portion 2C is protruded from the lower center of the disk i2b. The combination of both spiral protrusions 1a and lb creates a compression chamber 3. A suction chamber 4 and a suction section 5 are formed. Reference numeral 7 denotes a lower bearing support, and a communication hole 7a is formed on the outer periphery. 8 is an upper bearing support fixed on this lower bearing support 7, and has multiple oil flow holes 8a.
is provided. Reference numeral 9 indicates an Oldham's rotor which is interposed between the upper bearing support 8 and the swinging scroll 2 and prevents the swinging scroll from rotating; 10 is a driving electric motor, which is attached to the lower bearing support with bolts 23; (2) It consists of an electron 10a and a rotor 1ob fixed to a drive shaft 11, and a drawer M100 is drawn out. The drive shaft 11 has an eccentric hole 11b eccentric from the center of the shaft formed in a large diameter portion 11a formed at the upper end of the drive shaft 11. An upper thrust bearing 13 is fixed to an upper bearing support 8 to support the rod 2. The upper bearing that supports the large diameter portion 1a of the unit, 14 is an eccentric hole Nl.
An upper bearing 15 is fixed on the lower bearing support plate and swingably supports the protruding shaft portion 2c.
f: supporting lower thrust bearing; 16 is a lower bearing fixed to the lower bearing supporter and supporting the drive shaft 11;

Reference numeral 17 denotes a lower container for fixing the lower bearing supporter, the upper end of which is hermetically welded to the fixed scroll l. Reference numeral 18 denotes a lower container which is hermetically welded to the fixed scroll 1 and forms a high pressure chamber 19. 20 is a sealed drawer terminal, a
Several terminals 21 are drawn out airtightly to an insulating seat 22a such as a glass insulating seat, the insulating seat 22a is made of gold, and the flange is hermetically attached to the flank 22b, and the 7 flange 22b is hermetically welded to the 1st floor of the bottom container. combined. 24 is a bolt for fixing the upper AM bearing support 8 and the fixed scroll l to the lower bearing support 7; 25 is an oil pump means fixed to the lower end of the drive shaft 11; It is lifted into the eccentric oil supply hole lie by the action of a centrifugal pump to supply oil.

Reference numeral 26 denotes a partition plate fixed to the lower part of the container 17, and returns the lubricating oil 30 that has passed through each bearing to lubricate and flow down to the bottom of the container 17, as shown by the dotted arrows.

Next, 27 is a suction pipe hermetically connected to the lower container 17;
8 is a discharge pipe that is hermetically sealed to the upper container 18; 29 is a check valve that is attached to the fixed scroll 1 and passes the pressure line gas discharged from the discharge hole 6; the movable spring plate 29a and the receiver are connected to the plate 29b; Consisting of

In the above-mentioned conventional compressor, the electric motor 10 drives the electric motor TJIJIII111 to rotate, and the oscillating scroll 2 makes an oscillating motion! Do 1113. This generates a negative pressure, and gas from the outside is sucked in through the suction pipe 27, passes through the low pressure part inside the container 1) as shown by the solid line arrow, is sucked into the suction part 5, and enters the suction chamber 4. The volume of the gas in the suction chamber 4 is gradually reduced in the compression chamber 3 that is formed, and the gas becomes a high-pressure gas, which is then pressurized into the high-pressure chamber 19 through the discharge hole 6. The high pressure gas in the pressure chamber 19 is supplied to the outside from the discharge pipe 2.

As mentioned above, the upper container 18 above the fixed scroll 1
By forming a high pressure chamber 19 inside, it functions as a discharge muffler, eliminating the pressure pulsations and clogging that occur in the conventional scroll compressor. Startup failures due to 113A events are prevented.

[Problem that the invention seeks to solve]

In the conventional scroll compressor as described above, the upper container 1
In order to form a high pressure chamber 19 in the space with the fixed scroll 1, the fixed scroll 1 is hermetically welded, and the lower container 17 is sealed.
However, the upper container 18 cannot be directly welded to the lower container, which increases the number of work steps.

In addition, since the inside of the upper container becomes a high pressure chamber 19 during the day, it is not possible to provide a sealed lead-out terminal 20 for the electric motor 10.
It was installed in Shimoto container 17. Therefore, in order to connect the lead wire 10c to the terminal 21, it is necessary to insert and fix the lower bearing 7 to which the electric motor 10 is attached into the lower container 17, and then connect the drawer filoc to the terminal 21 in this state. , After this connection is completed, the upper bearing 8. The Oldham joint 91 double scroll 2.1 was assembled, and there was a problem in that the procedure of assembling all the internal components externally and then assembling them into the lower container 17 was not taken, making the assembly troublesome.

Furthermore, in order to connect the lead wire 10c to the terminal 21, the lower container 17 had to be provided with a mounting seat that protruded to the outside.

This invention was developed in order to solve these problems, and it has a high pressure chamber formed above the fixed scroll, and also allows direct connection between the upper container and the lower container, so that all the objects stored inside can be connected directly to each other. The object of the present invention is to obtain a scroll compressor in which component parts are pre-assembled externally and housed in a waste container, assembly is not complicated, discharge pulsation is reduced, and abnormal pressure increase during sleep startup is prevented.

[Means for solving problems]

The scroll compressor according to the present invention is provided with an annular projection Ehk surrounding a discharge hole on a disk portion of a fixed scroll, and a discharge muffler consisting of an upper end plate portion and a cylindrical portion is attached to the outer circumference of the annular projection portion via a packing. A fitted high pressure chamber is formed, a discharge pipe is connected to the muffler, the muffler is hermetically connected to the upper container with the upper end plate exposed, and a sealed lead-out terminal is attached to the upper container.

[Function] In this invention, after the components housed in the container are assembled externally, they are fitted and fixed in the lower container, and after connecting the lead wire of the motor to the sealed lead-out terminal attached to the upper container,
The upper container is hermetically joined to the lower container. The discharge muffler is hermetically fitted to the outer circumference of the annular protrusion on the fixed scroll via a gasket, and is hermetically coupled to the upper container to form a high pressure chamber.

〔Example〕

FIG. 1 is a longitudinal sectional view of a scroll compressor according to an embodiment of the present invention, and shows 2 to 16, 20, 21, 23 to 30
, 2a-2c, 7a, 8a, 10a, lo
b, lla-llc, 22a.

The reference numeral 22b is the same as the conventional device described above, and the explanation thereof will be omitted. Reference numeral 31 designates a fixed scroll, which is provided with an A-shaped protrusion 31b downward from the disk portion 31a, and an annular protrusion 31c surrounding the discharge hole 6 above. This annular projection 31
An annular groove 31d is provided on the outer circumference of c, into which a packing 35 consisting of an O-ring is fitted. 32 is a lower container, which is fixedly supported by fitting a lower bearing supporter. 33 is an upper container fitted into the lower container 32 and hermetically connected by welding or the like; 34 is a discharge muffler consisting of an upper end plate portion and a cylindrical portion 34a with an open bottom; The high pressure chamber 36 is fitted airtightly and movably up and down via a tube 35, and a discharge pipe 28 is welded to the chamber 36. The muffler 34 is hermetically welded to the center of the upper part of the container 33, and a sealed lead-out terminal 2o is attached to the container 33 in an airtight manner with an exposed upper end plate.

The compressor of the above embodiment is assembled as follows. The stator 10a of the electric motor 10 is attached to the lower bearing support 7 externally, the drive shaft 11 is inserted into the lower bearing support 7, and the trochanter 1ob (9) is fixed to the drive shaft 11 by shrink fitting or the like. Next, the upper bearing support 8. Orgeum m hand 9. Oscillating scroll 2. Install the fixed scroll 31. The thus assembled structure is placed in the lower container 32, and the lower bearing support 7 is fitted and fixed by press fitting or shrink fitting.

Next, the sealed pull-out terminal 20 attached to the upper container 33
The lead wire 10c of the electric motor 10 is connected to the terminal 21 of the electric motor 10. After fitting and fixing the outer container 33 into the lower container 32, the discharge muffler 34 is passed through the upper center of the upper container 33, and the gasket 35 is pressed and fitted onto the outer circumference of the annular projection 31c.

The upper container 33 is hermetically connected to the lower container 32 by welding or the like,
The discharge muffler 34 is hermetically welded to the upper container 33.

Inhalation of gas by the rocking motion of the rocking scroll 2.

The compression and discharge operations of compressed gas and the lubricating action of each bearing by the oil pump means 25 are the same as those of the conventional compressor described above.

In the apparatus of the above embodiment, the high pressure chamber 36 formed by the discharge muffler 34 has a sufficiently large volume, and can effectively attenuate discharge pressure pulsations as a muffler.
Even if the liquid refrigerant, etc. trapped in the lower container 32 is sucked through the suction part 5 and flows into the high pressure chamber 36 through the discharge hole 6, this high pressure chamber acts as an accumulator, and a large amount is transferred to the discharge pipe 2 at once. This prevents liquid from being discharged, prevents abnormal pressure rise due to temporary liquid clogging, and eliminates startup failures.

This discharge muffler 34 is simply welded and fixed to the upper container 33, and the annular protrusion 3 of the fixed scroll 31 is
K is fitted so as to be vertically movable, and the upper end plate portion is exposed from the upper container 33 and the discharge pipe 28 is directly brought out to the outside 9, making it easy to assemble the seal. Thereby, for example, even if the discharge muffler 34 is displaced upward due to the high pressure in the high pressure chamber 36, the disk portion 31a of the fixed scroll 31
will not be pulled or deformed.

Furthermore, since the sealed draw-out terminal 20 is attached to the upper container 33 forming a low-pressure section, the ambient temperature of the draw-out terminal 20 is increased due to heat transferred from the high-pressure section 36 during operation after compression. Prevents condensation and frost formation.

〔Effect of the invention〕

As described above, according to the present invention, an annular protrusion surrounding the discharge hole is provided on the disk portion of the fixed scroll, and a circumferential discharge muffler with an open bottom is provided on the outer circumference of the annular protrusion. The muffler is fitted through the gasket to form a high-pressure chamber, the discharge pipe is connected to this muffler, the upper end plate is exposed in the center of the upper container, and the muffler is airtightly connected.A sealed extraction terminal is attached to the upper container, so that the discharge pulsation is attenuated, preventing abnormal pressure rise during sleep startup, and improving assembly workability.

[Brief explanation of the drawing]

Figure WJ1 is a vertical cross-sectional view of an embodiment of a scroll compressor according to the present invention, and Figure 2 is a vertical cross-sectional view of a conventional scroll compressor. 2... Oscillating scroll, 2a... Disk portion, 2b
... Spiral projection, 3... Compression chamber, 6... Discharge hole, F... Lower bearing support, 8... Upper bearing support, 1o...
- Electric motor, 20... Kidney seal pull-out terminal, 21... Terminal, 27... Suction pipe, 28... Discharge pipe, 31... Constant scroll, 31a... Disc part, 31b... - Spiral projection, 31c... Annular projection, 32... Shimoto container,
33... Lower container, 34... Discharge muffler, 34a
...Cylindrical part, 35...Packing, 36...High pressure chamber. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] A fixed scroll in which a spiral protrusion is formed in the lower part of the disc part and a discharge hole is provided in the center of the disc part, and a fixed scroll in which the spiral projection is formed in the upper part of the disc part. an oscillating scroll disposed below and in which both of the spiral protrusions are combined to form a compression chamber; an electric motor eccentrically connected to the oscillating scroll from below by a drive shaft for causing oscillating movement; and an oscillating scroll. and a bearing support that supports the drive shaft via a bearing, lower and upper containers that hermetically house each of the above-mentioned components, a suction pipe connected to the lower container, and a high-pressure gas from the discharge hole of the fixed scroll. In a scroll compressor equipped with a discharge pipe leading out of the container and a sealed lead-out terminal to which a lead wire of the electric motor is connected and drawn out to the outside of the container, an annular protrusion surrounding a discharge hole is provided on the upper part of the disc part. The installed fixed scroll is made up of an upper end plate part and a cylindrical part, the lower part of which is open, and is hermetically fitted to the outer circumference of the annular protrusion via a packing to form a high pressure chamber, and a discharge pipe is installed in the upper end plate part. a discharge muffler hermetically coupled to the lower container; and an upper container hermetically coupled to the lower container, with the upper end plate of the muffler exposed at the center of the upper part, and the sealed extraction terminal attached airtightly. A scroll compressor characterized by: (2) The scroll compressor according to claim 1, wherein the sealed lead-out terminal extends through the glass insulating seat and is attached to the outer side of the upper container.