JPS62199984A - Scroll type compressor - Google Patents

Abstract

PURPOSE:To simplify the construction of a gas intake path by forming a gas guiding groove communicating to two intake ports on the back of a fixed element and covering said groove with a cover connected to a gas intake pipe communicating to the outside. CONSTITUTION:A fixed element 21 of a scroll type compression mechanism 15 is formed on the back with a gas guiding groove 53 communicating to two intake ports 51, 52. This groove 53 is covered with a cover 55 having the central hole 57 connected to a gas intake pipe 58 extending through an enclosing case 11 to the outside. By such constitution can be prevented intake gas from being heated by high pressure gas in the enclosing case 11 while the number of contact points and seal portions can be reduced since only one intake pipe 58 extends through the enclosing case 11 so that the construction of intake path can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an improvement of a scroll-type compression device in which a scroll-type compression mechanism is housed in a closed case.

(Prior Art) Scroll-type compression devices are conventionally known as low-pressure compression devices. This compression device has a compression mechanism constructed by combining a pair of scroll blades in the axial direction, and has advantages such as small size, high efficiency, and low vibration.

By the way, such a scroll type compression device usually
A frame is fixed at a position slightly above the sealed case in a form that vertically partitions the inside of the sealed case, a scroll type compression mechanism is arranged above the frame, and a scroll type compression mechanism is arranged below the frame. A motor is placed to provide driving force, and lubricating oil is stored in the bottom of the sealed case. Scroll type compression II is
Usually, it is composed of a fixed element with a protruding scroll blade and a movable element with a scroll-like protrusion arranged below the fixed element and meshing with the scroll blade. A bearing hole is provided vertically through the frame, and the rotating shaft of the motor described above is rotatably supported by the bearing hole. Further, an eccentric coupling mechanism and an Oldham Il#I are provided between the upper end of the rotating shaft and the movable element, and the eccentric coupling mechanism and Oldham Il#I cause the movable element to perform a turning motion without rotation. . And, the one that makes the space where the motor is installed high pressure, in other words, uses the sealed case as a high pressure tank.
Typically, the fixing element is provided with two holes each communicating with the two suction openings of the scroll-type compression mechanism, each of which is connected via two suction pipes which pass through the wall of the closed case in a gas-tight manner. I'm trying to communicate with the outside world.

However, the conventional scroll type compression device configured as described above has the following problems. That is, the scroll type compression mechanism is structurally formed with two suction ports. Conventional compressors use two suction ports to prevent the suction gas from heating.

Moreover, a suction pipe is provided corresponding to each suction port. For this reason, there is a problem that the number of connection points and sealing points increases, making manufacturing complicated. Furthermore, since it is necessary to provide a check valve in each suction pipe, there is also the problem of increasing the overall cost.

(Problems to be Solved by the Invention) For the above-mentioned reasons, unless the structure is simplified, manufacturing cannot be facilitated and costs can be reduced.

Therefore, it is an object of the present invention to provide a scroll type compression device that can simplify the structure while preventing heating of the suction gas, thereby realizing easier manufacturing and lower cost. .

[Structure of the Invention] (Means for Solving the Problems) In the scroll type compression device according to the present invention, a gas guide groove is provided on the back surface of the fixed element in a relationship that commonly communicates with the two suction ports of the scroll type compression mechanism. .

A cover fixed to the back side of the fixed element is provided so as to cover the opening of the gas guide groove, a hole communicating with the gas guide groove is provided in this cover, and one end side is connected to the hole and the other end side is sealed. A single gas suction pipe is provided that hermetically penetrates the wall of the case and is led to the outside, and a check valve is provided between this gas suction pipe and the gas guide groove.

(Operation) Low-pressure gas is supplied to the two suction ports through one suction pipe, and high-pressure gas attempting to flow back through the two suction ports is stopped by one check valve.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 11 denotes a vertically elongated sealed case, and this sealed case 11 is welded to a bottomed cylindrical lower case 12 so as to close the upper end opening of the lower case 12. and a case 13. The sealed case 11 is located at an upper position inside the sealed case 11.
A frame 14 is fixed to partition the inside in the vertical direction.

A scroll type compression mechanism 1 is installed above the frame 14.
5 is disposed below the frame 14, and a motor 16 for providing driving power to the scroll type compression mechanism 15 is disposed below the frame 14.
is arranged, and furthermore, lubricating oil 1 is placed at the bottom of the sealed case 11.
7 is accommodated.

The scroll type compression mechanism 15 is composed of a fixed element 21 and a movable element 22 arranged below the fixed element 21, as in the known one.

The fixing element 21 includes a disk-shaped mirror plate 23, an annular wall 24 protruding from the peripheral edge of one surface of the mirror plate 23, and a portion surrounded by the annular wall 24 having a height approximately equal to that of the annular wall 24. It is composed of a scroll vA25 protruding from the side, and a discharge port 26 provided approximately at the center of the end plate 23. A portion of the annular wall 24 is fixed to the frame 14 with bolts.

On the other hand, the movable element 22 includes a mirror plate 37 having an outer diameter larger than the inner diameter of the annular wall 24, and a scroll blade 32 protruding from one surface of the mirror plate 31 at a height approximately equal to the height of the scroll blade 25. and a cylindrical portion 33 protruding from the other center of the mirror plate 31 in the drawing. In the movable element 22 configured as described above, the scroll blades 32 and the scroll blades 25 mesh with each other with the protruding direction of the scroll 132 being upward, and the peripheral part of the mirror plate 31 and the end of the annular wall 24 The two parts are in sliding contact with each other, and this mounted state is maintained by an Oldham mechanism 34 provided between the end plate 31 and the frame 14.

A bearing hole 35 eccentric to the axis of the cylindrical portion 33 of the movable element 22 is provided through the frame 14 in the vertical direction, and the bearing hole 35 is located on the cylindrical portion 33 side of the bearing hole 35. A large diameter portion 36 is formed in the portion. The upper end edge of the large diameter portion 36 is provided with an annular thrust receiver which projects upward and which receives thrust force applied to the end plate 31 of the movable element 22 and functions as a sealing material. 37 are provided.

A rotating shaft 40 of the motor 16 is rotatably supported in the bearing hole 35 of the frame 14 .

The rotating shaft 40 has a large diameter portion 41 formed in a portion located in the large diameter portion of the bearing hole 35, and a small shaft 42 that fits into the aforementioned cylindrical portion 33 is protruded from this large diameter portion 41. There is. The rotating shaft 40 is formed in such a length that its lower end penetrates into the lubricating oil 17.

Inside the rotating shaft 40, there is a hole 4 through which lubricating oil 17 is pumped up to the bearing surface and the fitting part between the small shaft 42 and the cylindrical part 33 by a centrifugal pump action.
3 is formed.

The motor 16 is a cage-shaped induction lightning with a concave rotor 45 on the inside and a stator 46 on the outside! 11n.

Therefore, on the end plate 23 of the fixing element 21.

At positions corresponding to the two suction ports of the compression chamber P formed by the fixed scroll blade 25 and the movable scroll 1H32,
Suction holes 51 and 52 passing through the mirror plate 23 are respectively formed. As shown in FIGS. 2 and 3, a gas guide groove 53 is formed in the upper surface of the end plate 23 in a dogleg shape to connect the suction ports 51 and 52. A convex portion 54 having a diameter smaller than the width of the gas guide groove 53 is formed at the center of the gas guide groove 53, that is, at the bending point position. A cover 55 is placed on the upper surface of the end plate 23 to cover the gas guide groove 53, and this cover 55 is fixed to the end plate 23 with bolts 56. cover 5
As shown in FIG. 5, a hole 57 communicating with the gas guide groove 53 is formed at a position opposite to the convex portion 54 of the sealing case 11. It is connected to a suction pipe 58 provided. and.

A check valve 59 is installed between the connecting portion of the suction pipe 58 and the hole 57 and the convex portion 54 in such a manner that it always closes the end of the suction pipe 58.

In FIG. 1, 61 indicates a hole that communicates the upper chamber and the lower chamber partitioned by the frame 14, 62 indicates a discharge pipe, and 63 indicates a connection mechanism for power supply to the motor 16.

Next, the operation of the compression device configured as described above will be explained.

First, when power is supplied to the motor 16, the rotating shaft 40 starts rotating. The rotational force of the rotating shaft 40 is then transmitted to the movable element 22. The cylindrical portion 33 of the movable element 22 is fitted with a small shaft 42 provided eccentrically with respect to the rotating shaft 40, and is supported by the Oldham mechanism 34, so that the movable element 22 does not rotate on its own axis. Make a turning movement. Therefore, the scroll blades 32 provided on the movable element 22
It also performs a turning movement. Along with this swirling movement, the volume of the compression chamber P formed between the scroll blades 25 and the scroll battlers 32 is periodically reduced, thereby causing the suction pipe 58. Check valve 57. Gas guide 53. Suction hole 51.
The gas sucked in via 52 is compressed and discharged from the discharge port 26.

The discharged high pressure gas flows through the hole 61. The motor 16 is housed in a room and is sent out through a discharge pipe 62.

This is where the function as a compression device comes into play.

On the other hand, when the motor 16 rotates as described above, the lubricating oil 1
7 is pumped upward into the hole 43 by the centrifugal pumping action due to the shape of the hole 43. This pumped up lubricating oil lubricates the inner circumferential surface of the bearing hole 35, then lubricates the fitting part between the small shaft 42 and the cylindrical part 33, and then lubricates the surface of the thrust bearing 37. It lubricates the part where the Oldham mechanism 34 is provided, and then enters into the compression chamber P and lubricates the sliding part in the pressure ll1iWP. The lubricating oil that has entered the compression chamber P is finally discharged from the discharge port 26 and then flows downward through the IL 61.

In this way, only one suction tube 58 is used.

Furthermore, low pressure gas is sucked in from two suction ports with a scroll pressure of 1141115. therefore,
Compared to conventional compression devices, the number of connections and seals in the system for sucking low-pressure gas can be significantly reduced, making manufacturing easier. Furthermore, since only one check valve is required, the overall cost can be reduced.

Note that the present invention is not limited to the embodiments described above. That is, in the embodiments described above, gas guide grooves are provided on the end plate of the fixing element, but gas guide grooves may also be provided on the cover side.

[Effects of the Invention] As detailed above, according to the present invention, the configuration of the suction system can be reduced to 1 iJl while preventing heating of the suction gas, so that the scroll can be manufactured easily and the overall cost can be reduced. Expansion and compression equipment B can be provided.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a scroll type compression device according to a 1M example of a part of the present invention, FIG. 2 is a top view of a fixing element in the device, and FIG. 3 is a view taken along the line A-A in FIG. 2. Figure, 4th
The figure is a top view of the cover in the same device, and FIG. 5 is a view taken along the line B-8 in FIG. 4. 11... Sealed case, 14... Frame, 15...
・Scroll type compression mechanism, 16...Motor, 17...
- Lubricating oil, 21...fixed element, 22...movable element,
25゜32...Scroll buy, 26...Discharge port, 3
4...Oldham mechanism, 35...Bearing hole, 37...
Thrust receiver. 40...Rotating shaft, 51.52...Suction port, 53.
... Gas guide groove, 55 ... Cover, 57 ... Hole, 5
8... Suction pipe, 5... Check valve. Applicant's agent Patent attorney Takehiko Suzue Figure 1 Figure 3 Figure 5

Claims (1)

[Claims] Scroll-type compression consisting of a fixed element and a movable element, each of which is joined in the axial direction to form a compression chamber therebetween, and each of which has a scroll blade that meshes with each other within the compression chamber. A mechanism is disposed in a sealed case, and the movable element is rotated without rotation by the power of a motor provided in the sealed case, thereby compressing the gas, and compressing the gas by the scroll type compression mechanism. In the scroll type compression device, the gas is sent out of the closed case through a space in which the motor is disposed, wherein a rear surface of the fixed element is connected in common to two suction ports of the scroll type compression mechanism. a gas guide groove formed in relation to each other, a cover fixed to the back side of the fixing element so as to cover an opening of the gas guide groove, a hole provided in this cover and communicating with the gas guide groove, and this hole. a gas suction pipe whose one end is connected to the airtight case and whose other end is guided to the outside by passing through the wall of the sealed case in an airtight manner; and a non-return check provided between the gas suction pipe and the gas guide groove. A scroll type compression device characterized by comprising a valve.