JPH01163484A - Oil injection type scroll compressor - Google Patents

Abstract

PURPOSE:To reduce the length of an oil passage and facilitate the handling of piping by screwing a plug into an oil feeding port and forming a spiral orifice. CONSTITUTION:An oil feeding port 15 provided on a fixed scroll 2 consists of a large diameter bore portion 16, a small diameter lap-portion oil feeding port 17 the end of which is opened into a compression chamber 10, and an end-plate oil feeding port 18 the end of which is opposite to the end plate 8A of a revolving scroll 8 and opened in a casing 1. In the end-plate oil feeding port 18, and orifice 21 composed of a spiral flow passage is formed between the outer peripheral face of the shaft portion 20A of a plug 20 screwed in the internal thread portion 18A and the inner peripheral face of the internal thread portion 18A, and the length of the flow passage of the orifice 21 can be extendingly/contractingly adjusted by rotating and advancing/retracting the plug 20 in the axial direction.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a roll compressor suitable for compressing gas such as air or refrigerant (hereinafter referred to as air), and particularly relates to an oil-cooled compressor. The present invention relates to scroll compressors.

(Prior art) Generally speaking, an oil-cooled scroll compressor has a bearing on one side. a casing whose other side is a cylindrical part; a fixed scroll fixed to the cylindrical part of the casing; A drive shaft that is a crankshaft, and a compression chamber that is located within the cylindrical portion of the casing and is rotatably provided on the crankshaft of the drive shaft via a bearing, overlaps with the fixed scroll and rotates. It generally consists of an orbiting scroll and an oil supply port formed in the casing or the fixed scroll for supplying oil to a sliding contact area between the orbiting scroll and the fixed scroll or in the casing.

And, when the motor rotates, the scroll compressor
The rotation is transmitted to the orbiting scroll via the drive shaft and bearings, and while the orbiting scroll is orbiting, the air sucked in from the suction port is confined in the compression chamber, gradually compressed in the compression chamber, and then released from the discharge port together with oil. Discharge into oil separation tank.

On the other hand, during the compression operation, the pressure inside the oil separation tank is the same as the discharge pressure, and a pressure difference occurs between the inside of the casing and the oil inside the oil separation tank, so that the oil inside the oil separation tank is transferred to the oil supply port of the casing via an oil pipe such as a capillary tube. It is designed to lubricate the drive shaft and bearings of the orbiting scroll, seal and cool the lap parts of the fixed scroll and orbiting scroll, and lubricate and seal the sliding parts of the fixed scroll and orbiting scroll. .

[Problems to be Solved by the Invention] By the way, when the oil separation tank and the oil supply port are connected via oil piping, if the tank pressure inside the oil separation tank acts directly on the oil piping side, air will flow together with the oil. It will be supplied to the oil supply port side. Therefore, in conventional technology, a fixed orifice and a long capillary tube with a small diameter are used as the oil piping, and the pressure loss of the tube is used to reduce the air pressure, and only oil is supplied to the oil supply port side. It is configured so that it can be done.

However, when a capillary tube is used as a decompression tube as described above, there is a limit to reducing the inner diameter of the tube in order to obtain a desired decompression value, and clogging is likely to occur. Furthermore, if the tube is made longer, the piping will be troublesome and the material cost will increase.

The present invention was devised in view of the above-mentioned drawbacks of the prior art, and is an oil-filled scroll that can be used by shortening large-diameter oil piping, can obtain the desired pressure reduction effect, and can adjust the oil amount. The company provides compressors.

[Means for solving problems]

The feature of the means of the present invention configured to solve the above-mentioned problems is that the oil supply port provided in the casing or fixed scroll is formed in a punch hole, and a plug is screwed into the oil supply port. The reason is that a spiral orifice is formed between the plug and the oil supply port.

[Effect]

By forming the orifice provided in the oil supply port in a spiral shape, the distance of the oil passage can be lengthened, and the length of the extraction pipe can be shortened by that amount, and there is no need to have a pressure reducing part in the oil pipe, so the hole diameter is large. Oil piping can be used and clogging of the piping can be prevented. Furthermore, when an oil passage is formed in the casing to eliminate piping, there is no need to consider the cross-sectional area of the passage, and the oil passage can be easily formed.

Furthermore, by rotating the plug to advance and retreat, the oil flow rate can be easily adjusted.

(Example) Hereinafter, as an example of the present invention, a case where a compressor is installed vertically will be described in detail based on the drawings.

In the figure, 1 is a casing, and the casing 1 includes a bearing part IA and a large diameter cylindrical part I formed on the lower end side of the bearing part IA.
B, and a stepped scroll fitting hole tC formed at the tip of the large diameter cylindrical portion IB.

2 is a fixed scroll, and the fixed scroll 2 has an end plate 2A.
, a spiral wrap portion 2B that stands upright on the end plate 2A, and a cylindrical portion 2D that protrudes at the same height as the wrap portion 2B so as to surround the wrap portion 2B, and whose L surface is the sliding surface 2C. and a flange portion 2F protruding in the radial direction from an intermediate portion of the cylindrical portion 2D. Then, the cylindrical part 2D is fitted into the scroll fitting hole 1C of the casing l, the flange part 2F is brought into contact with the end face of the large diameter cylindrical part IB, and the bolt (
(not shown), the casing l and the fixed scroll 2 are integrated. In addition, the wrap section 2
B is formed into an involute or a curve close to an involute, and furthermore, the flange portion 2 of the fixed scroll 2
A suction port 3 is formed at F, and a discharge port 4 is formed approximately at the center of the end plate 2A.

Reference numeral 5 denotes a drive shaft rotatably supported via a pair of bearings 6 and 7 arranged at a predetermined distance apart from the bearing portion IA of the casing 1, and one end of the drive shaft 5 protrudes outside the casing l. It is connected to a motor (not shown), and the other end protrudes into the large diameter cylindrical portion IB to form a crank 5A. The drive shaft 5 has the same axis 01 as the axis of the fixed scroll 2.
, and the axis 02 of the crank 5A is
It is eccentric by a distance δ with respect to +.

Reference numeral 8 denotes an orbiting scroll rotatably supported by the crank 5A of the drive shaft 5 via an orbiting bearing 9, and the orbiting scroll 8 is coaxial with the axis 02 of the crank 5A. Here, the orbiting scroll 8 includes a disc-shaped end plate 8A,
It consists of a spiral wrap portion 8B that is erected on the mirror plate 8A, and the wrap portion 8B is formed into an involute or a curve close to an involute. The orbiting scroll 8 is attached so that the wrap portion 8B overlaps the wrap portion 2B of the fixed scroll 2 with a predetermined angle shift, and a sealed space is formed between each of the upper portions 2B and 8B, and a plurality of compression chambers IO are formed. is forming. In order to stabilize the turning movement of the end plate 8A, its outer peripheral side is held between an annular groove formed by the scroll fitting hole IC of the casing l and the sliding surface 2C of the cylindrical part 2D forming the fixed scroll 2. There is. ll is an end plate 8 of the orbiting scroll 8 in order to guide the compressed air in the compression chamber IO to the back side of the orbiting scroll 8.
This is the back pressure introduction hole drilled in A.

12 is an Oldham joint provided between the casing l and the orbiting scroll 8, and the Oldham joint 12 connects the orbiting scroll 8 to the axis of the drive shaft 5 &90. It is guided so that it revolves around the center with a radius of δ.

Next, 13 is a bracket fixed to the upper surface of the bearing part IA of the casing l, and 14 is an oil supply port bored in the bracket 13. One end of the oil supply port 14 is a female joint, and the other end is a female joint. This is an oil supply path that opens inward, and oil in an oil separation tank 23 (to be described later) is supplied to each bearing 6, 7.9 in the casing 1 through the oil supply port 14.

On the other hand, 15 is another oil supply port bored in the fixed scroll 2, and the core oil supply port 15 is connected to the large diameter port 16 and the large diameter port 1.
A small-diameter lap oil supply hole 17 is formed in communication with the inner part of the large-diameter opening 16, and the tip thereof opens into the compression chamber 10.
An end plate oil supply hole 18 opened in the casing l facing A
It consists of

Here, the end plate oil supply hole 18 opens at the large diameter opening 16 on one side, has a tapered surface 1BAI on the other side, and has a female thread 1 on the inner peripheral surface.
It consists of a large-diameter female screw portion 18A with a numeral 8A2 engraved thereon, and a small-diameter hole portion 18B bored in the axial direction from the tapered surface 18Al of the female screw portion 18A, and the tip of the small-diameter hole portion 18B is connected to a fixed scroll. An annular oil groove 19 recessed in the sliding surface of 2
is connected to.

Reference numeral 20 denotes a plug screwed into the female threaded portion 18A of the end plate oil supply hole 18, and as shown in FIG. portion 20A, and formed on the outer periphery of the shaft portion 20A,
The male thread 2 screws into the female thread l 8A of the female thread part 18A.
0B, and a cross groove 20C for rotation, which is formed on the axial-side end surface of the shaft portion 20A and engages a driver or the like. By screwing the plug 20 into the female threaded portion 18A, an orifice formed of a spiral flow path is formed between the outer peripheral surface of the shaft portion 20A of the plug 20 and the inner peripheral surface of the female threaded portion 18A by the male thread 20B. 21 is formed, and by rotating the plug 20 and moving it forward and backward in the axial direction, the wave path length of the orifice 21 can be expanded and contracted. Note that 22 is a sealing plug.

Furthermore, 23 is an oil separation tank, and the kernel oil separation tank 23 is connected to the discharge port 4 via a discharge pipe 24, and a mixture of compressed air and oil is supplied from the discharge port 4. 25 supplies oil separated from compressed air in the oil separation tank 23 to each oil supply port 14.
．． The core oil pipe 25 is a pipe for supplying oil into the casing l through the capillary tube 15, and the core oil pipe 25 is made of a pipe body with a larger diameter than a conventional capillary tube, and the branch pipe 25A on one side that branches in the middle is used for oil supply. Connected to the port 14, the branch pipe 25B on the other side
is connected to the oil supply port 15.

The present embodiment is constructed as described above, and its operation will be explained next.

When the motor (not shown) is rotated, the rotation is caused by the drive shaft 5.
, is transmitted to the orbiting scroll 8 via the orbiting bearing 9, and the orbiting scroll 8 is aligned with the axis 0.0 with respect to the fixed scroll 2.
Perform relative yen interlocking around . The air sucked in from the suction port 3 is gradually compressed in the compression chamber IO, and after being raised to a predetermined pressure, it is supplied from the discharge port 4 via the discharge pipe 24 to the oil separation tank 23, and the oil is separated. The air that has been separated from oil and purified in the tank 23 is supplied to an air tank (not shown).

On the other hand, the oil separated from the compressed air in the oil separation tank 23 is transferred to the oil pipe 2 due to the pressure difference between the tank 23 and the casing l.
5, the branch pipe 25A, and the oil supply port 14 are sequentially valved to connect the bearing 6.
.
Lubrication, sealing, cooling, etc. of these sliding contact parts are performed.

By the way, although there is a negative pressure between the sliding surface 2C of the fixed scroll 2 and the end plate 8A of the orbiting scroll 8 together with the inside of the compression chamber IO on the suction port 3 side, the oil separation tank 23 is When supplying oil into the annular oil groove 19, the hydraulic pressure on the end plate oil supply hole 18 side is reduced in order to prevent the orbiting scroll 8 from separating from the fixed scroll 2 due to the pressure of the oil separation tank 23. Is it necessary? Therefore, by forming a part of the end plate oil supply hole 18 into a small diameter hole 18B and forming a spiral orifice 21,
The oil supplied to the head plate oil supply hole 18 is depressurized and sucked into the annular oil groove 19 by negative pressure to perform lubrication, sealing, etc. between the fixed and rotating scrolls 2 and 8. .

According to this embodiment, the orifice 21 is formed in the end plate oil supply hole 18 by the female threaded portion 18A and the plug 20.
Moreover, since the orifice 21 is formed in a spiral shape, the orifice 21 consists of a flow path having a much longer distance than the axial length of the female threaded portion 18A. Therefore, the oil piping 25.25B connected between the oil separation tank 23 and the oil supply port 15 can be shortened by the length corresponding to the flow path of the orifice 21, and the oil piping 25.
25B piping process becomes easier. Also, oil pipe 25.2
Unlike conventional technology, 5B does not need to function as a pressure reducing tube and can use oil piping with a larger inner diameter than conventional ones, so the piping can be clogged with foreign objects and abnormally high temperatures can occur due to insufficient oil supply. , burn-in accidents, etc. can be prevented.

Moreover, according to the embodiment, the plug 2 can be removed by removing the sealing plug 22.
The length of the flow path of the orifice 21 can be changed by rotating it with a jig such as a driver and moving it forward and backward.
Since the opening area between the plug 20 and the tapered surface 18A+ of the female threaded portion 18A can be changed, it is possible to adjust the flow rate of oil, which was impossible when using a capillary tube. An appropriate amount of oil can always be supplied to the sliding contact portion of the orbiting scroll 8.

Although the embodiments have been described using a vertically installed scroll compressor, the present invention can also be applied to a horizontally installed scroll compressor. In this case, the oil supply port 15 may be provided in the fixed scroll 2 so as to be located above the end plate sliding surface 2C of the fixed scroll 2. Since oil permeates between the fixed scroll 2 and the orbiting scroll 8 due to its own weight, good lubrication and cooling conditions can be maintained.

In addition, the embodiment has been described assuming that the spiral orifice 21 is formed by a threaded groove formed by making the outer diameter D2 of the shaft portion 20A of the plug 20 slightly smaller than the inner diameter D1 of the female threaded portion 18A. It can be formed into an appropriate shape such as a U-shape, a semicircular shape, or a V-shape.

Furthermore, although the embodiment has been described in which the spiral orifice 21 is provided in the oil supply hole 18 of the oil supply port 15 of the fixed scroll 2, the spiral orifice 21 may be provided in the oil supply hole 17 of the lap part.
It may be provided in the oil supply port 14 of the casing l. Furthermore, the embodiment also includes an oil separation tank 23 and an oil supply port 15.
Although it has been described that the oil passages are connected to the casing 1 and the fixed scroll 2 by the oil piping 25, the present invention can also be applied to a piping-less configuration in which the oil passages are formed in the casing l and the fixed scroll 2 and the oil piping 25 is abolished. In this case as well, since there is no need to make the cross-sectional area of the oil passage strict, hole machining is easy and the degree of freedom in design can be increased.

In the embodiment, a sintered filter or the like may be attached to the oil supply port 15 at the upstream side of the spiral orifice 21, thereby preventing clogging of the orifice 21 and the small diameter hole 18B. It can definitely be prevented.

(Effects of the Invention) The present invention has been described in detail above, and by providing a spiral orifice in the oil supply port, the length of the conventional oil passage can be shortened, and as a result, piping processing becomes easier. The oil passage can be formed with a large hole diameter, and clogging accidents in the oil passage can be prevented. Further, since the flow path length and opening area of the orifice can be changed by moving the plug that forms the orifice back and forth, the oil flow rate can be adjusted extremely easily.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an oil-cooled scroll compressor according to an embodiment of the present invention, and FIG. 2 is an enlarged view of the main parts in FIG. l...Casing, 2...Fixed scroll, 5...
・Drive shaft, 8...Orbiting scroll, 14.15...
Oil supply port, 18 A-...Female thread portion, 20...Plug, 21...Spiral orifice.

Claims (1)

[Claims] a casing having a bearing portion on one side and a cylindrical portion on the other side; a fixed scroll fixed to the cylindrical portion of the casing;
a drive shaft which is rotatably provided in the bearing part of the casing via a bearing and whose tip end inside the casing becomes a crankshaft; for supplying oil to an orbiting scroll that is rotatably provided and forms a compression chamber while rotating while overlapping with the fixed scroll, and a sliding contact portion between the orbiting scroll and the fixed scroll or within the casing; In an oil-cooled scroll compressor equipped with an oil supply port formed in the casing or the fixed scroll, the oil supply port is formed in a screw hole, and a plug is screwed into the oil supply port. An oil-cooled scroll compressor characterized by forming a spiral orifice between the oil supply port and the oil supply port.