JP2002168183A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the restricting effect of a restricting portion of a scroll compression mechanism without being blocked by dirt existing in a lubricant. SOLUTION: The restricting portion 24 is provided with a spiral restriction path 33.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor used for a refrigerating cycle device or the like.

[0002]

2. Description of the Related Art A conventional compressor of this type will be described with reference to FIG.
And a fixed spiral part 10 having a fixed end plate 54, and a swirling spiral part 11 having a swirling spiral blade 55 and a swirling end plate 25 to constitute a compression mechanism 2 having a plurality of compression chambers 32. When the compression chamber 32 moves while changing its volume when the rotation of the rotation part 11 is restricted along the circular orbit while restricting the rotation, the suction part 11 of the compression mechanism part 2 of the compression mechanism part 2 can be sucked, compressed, and discharged. The inner region 21 and the outer region 2 are provided on the side opposite to the blade surface and are sealed by a seal member 28.
The lubricating oil is supplied to the inner area 21 of the back pressure chamber 56 defined by the section 9, and the supplied lubricating oil is supplied to the outer area 29 and the suction space 30 of the compression mechanism 2 via the throttle unit 24. In this way, the back pressure generated by the supply of the lubricating oil to the inner region 21 and the outer region 29 prevents the swirling spiral component 11 from overturning away from the fixed spiral component 10.

The throttle portion 24 reduces the pressure of the high-pressure lubricating oil supplied to the inner region 21 and supplies it to the outer region 29 in an appropriate amount to lubricate sliding parts such as the rotation restraining parts 12 and the like.
As the amount of supply to 9 increases, the pressure there increases to a predetermined pressure for preventing the swirling spiral part 11 from overturning. When the pressure becomes equal to or higher than a predetermined pressure, the back pressure adjusting mechanism 31 opens to release the lubricating oil to the suction space 30 of the compression mechanism section 2 to maintain a predetermined pressure state and to lubricate the sliding section of the compression mechanism section 2. ing.

A conventional throttle unit corresponding to the throttle unit 24 according to the embodiment of the present invention has a screw portion a for mounting as shown in FIG.
And a cylindrical pin b having A narrow passage c formed by a straight fine hole is formed at the center of the pin b.
The throttle effect is generated by the throttle passage c to reduce the pressure. The appropriate amount of lubricating oil supply is adjusted by changing the inner diameter of the throttle passage c.

[0005]

However, in order to increase the throttle effect in the above-described conventional throttle portion, the diameter of the hole needs to be considerably reduced because the throttle passage c is straight and short. And the compressor performance becomes unstable. In addition, the drawing path c has a problem that the processing cost increases as the hole diameter decreases. An object of the present invention is to solve such a conventional problem and to provide a high-efficiency and low-cost scroll compressor with stable performance.

[0006]

In order to achieve the above object, a scroll compressor according to the present invention comprises a fixed spiral component having a fixed spiral blade and a fixed head plate, and a swirling spiral component having a swirling spiral blade and a swivel head plate. And a compression mechanism having a plurality of compression chambers by engaging with each other, and when the swirling spiral part is restrained from rotating and swirled along a circular orbit, the compression chamber moves while changing its volume, so that suction, Along with performing compression and discharge, lubricating oil is supplied to an inner region of a back pressure chamber which is provided on the opposite side of a blade surface of the swirling spiral part of the compression mechanism and is divided into an inner region and an outer region by a seal member. And, in the scroll compressor configured to supply the supplied lubricating oil to the outer region and the suction space of the compression mechanism via the throttle unit, the throttle unit has a spiral throttle passage. Characteristic It is intended to.

With this configuration, when the swirling spiral part is swirled along a circular orbit and the suction, compression and discharge are repeatedly performed in the compression chamber between the fixed spiral part and the swirling spiral part, the swirling spiral part is not used. In the back pressure chamber opposite to the blade surface of
The lubricating oil is supplied to the inner area defined by the seal member, and a part of the lubricating oil is supplied to the respective parts for lubrication. At the same time, the other part of the lubricating oil supplied to the inner area is depressurized by the constriction part to reduce the back pressure. While supplying an appropriate amount to the outside area of the chamber and lubricating each part, the inside area of the back pressure chamber becomes the supply pressure of lubricating oil, and the outside area becomes a predetermined pressure, thereby backing up the swirling parts and turning. This prevents the spiral part from overturning away from the fixed spiral part.

In particular, since the throttle portion has a spiral throttle passage, the length of the throttle passage can be increased from several times to several tens of times even if the throttle portion has the same length as the conventional one. Even if the hole diameter is increased by the proportion of the length, the same squeezing effect can be obtained. Thus, the throttling effect can be sufficiently enhanced without causing blockage due to the above, and the performance of the scroll compressor can be made highly efficient and stable. In addition, processing is easier and lower cost than in the case where the hole diameter is small because the hole diameter may be large.

The throttle passage is formed by a male member having a spiral groove formed on an outer peripheral surface thereof and a female member having the male member inserted into a hole, or a spiral groove is formed on an inner peripheral surface of the hole. When the female member and the male member inserted into the hole are formed, a spiral groove is formed on the open outer or inner peripheral surface of each of the male and female members to be fitted, and the fitting is performed. The helical groove alone forms a spiral throttle passage between the male and female members, so that the processing of the throttle passage becomes easier and the cost is further reduced.

[0010] If the end of the male member is provided with a slit cut from the end surface, the spiral drawing passage may be incomplete at the end of the male member due to defective machining or subsequent collapse. In the spiral throttle passage, the inner portion from the end portion is connected at a plurality of locations through slits to secure the flow passage of the throttle passage, so that the reliability is high.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of the scroll compressor according to the present invention will be described below in detail with reference to FIGS. 1 to 5 so that the present invention can be understood.

A first embodiment of the present invention shown in FIGS.
In each of the second embodiment shown in FIG. 3, the third embodiment shown in FIG. 4, and the fourth embodiment shown in FIG. 5, the compression mechanism 2 and the compression mechanism 2 are placed in a container 1 as shown in FIG. This is an example of a vertically arranged scroll compressor for a refrigeration cycle that accommodates a driving motor 3. However, the present invention is not limited to this. As shown in FIG. 1, a fixed spiral part 10 having a fixed spiral blade 53 and a fixed head plate 54, and a swirl spiral part 11 having a swirl spiral blade 55 and a swivel head plate 25. To form a compression mechanism 2 having a plurality of compression chambers 32. When the revolving spiral part 11 is constrained from rotating by the rotation constraining part 12 and revolves along a circular orbit, the volume of the compression chamber 32 becomes larger. In addition to performing suction, compression, and discharge by moving while changing the rotation, the swirling spiral part 1 of the compression mechanism 2
The lubricating oil is supplied to the inner area 21 of the back pressure chamber 56, which is provided on the side opposite to the blade surface of the first pressure chamber 1 and is divided into the inner area 21 and the outer area 29 by the seal member 28. , 34, 38, and 42, the present invention is effective when applied to various types of scroll compressors having a basic configuration for supplying the outer region 29 and the suction space 30 of the compression mechanism section 2 in general. It belongs to the category of the invention.

The specific structure and basic operation of the scroll compressor shown in FIG.
Is a stator 4 fixed to the inside of the container 1 by shrink fitting or welding, etc., and a rotor 5 located inside the stator 4.
The rotor 5 is connected to the outer periphery of the drive shaft 6. One end of the drive shaft 6 is rotatably supported via a bearing 8 on a main bearing component 7 constituting a part of the compression mechanism 2 as a fixing member for backing up the swirling spiral component 11. Drive shaft 6 supported by bearing 8
Is provided with a crankshaft 9 that performs eccentric motion with respect to the drive shaft 6. On the other hand, by engaging the fixed spiral part 10 and the revolving spiral part 11, a plurality of compression chambers 32 are formed.
And a rotation restraining part 12 is provided between the swirl spiral part 11 and the main bearing part 7 to prevent the rotation of the swirl spiral part 11 from rotating.
By making a turning motion along a circular orbit via 3
The compression chamber 32 is moved from the outer circumference to the center while reducing the volume, and the refrigerant gas is sucked and compressed through the suction pipe 57 of the container 1 and the suction port 14 of the outer circumference of the compression mechanism 2 to be compressed. Refrigerant gas or the like is discharged from the discharge port 15 at the center to the space 16 in the container 1 via the inside of the muffler 50 above the compression mechanism 2.

The other end of the drive shaft 6 is supported by a sub-bearing part 17, and the other end of the drive shaft 6 is provided with a positive displacement pump 18 at the other end.
, The pump 18 is driven at the same time. By this drive, the pump 18 sucks the lubricating oil from the lubricating oil reservoir 19 at the lower part of the container 1, passes through the oil supply path 20 provided at the center of the drive shaft 6 in the axial direction, and the inner region 21 in the back pressure chamber 56.
To supply. A part of the lubricating oil that has reached the inner region 21 flows down sequentially so as to seep out the slewing bearings 13 and 8, lubricates and cools them, and then joins the refrigerant gas discharged to the space 16 and discharged there. The gas is blown out as a swirling flow to the lower part of the electric motor 3 through the gas passage 51 of the rotor 5. At this time, the lubricating oil in the refrigerant gas is centrifuged, returned to the lubricating oil reservoir 19, and recirculated. The refrigerant gas after the separation of the lubricating oil reaches the upper part of the container 1 through the stator 4 or the gas passage 52 between the stator 4 and the container 1, is discharged from the discharge pipe 58 of the container 1, and is supplied to the refrigeration cycle.

On the other hand, the other part of the lubricating oil supplied to the inner region 21 passes through the slots 23, 34, 38, and 42 through the elongated holes 23 provided inside the swirling spiral component 11, and then passes through. After the pressure is reduced, the revolving end plate 25, the depression 26 provided in the main bearing component 7, the upper surface 27 of the fixed spiral component 10, and the outer region 29 constituted by the sealing member 28 are supplied in an appropriate amount based on the reduced pressure. .

Here, the inner region 21 becomes a high pressure portion which is higher than the discharge pressure of the compression mechanism 2 as a supply pressure of the lubricating oil, and the outer region 29 becomes a high pressure portion as the supplied lubricating oil increases. It is set to a pressure intermediate to the discharge pressure. The swirling spiral part 11 is backed up by the high pressure state at the center and the intermediate pressure state at the periphery of the back pressure chamber 56 to prevent the swirling spiral part 11 from being separated from the fixed spiral part 10 and capsulating. I have. The seal member 28 has a role of sealing between the inner region 21 which is a high pressure portion and the outer region 29 which is an intermediate pressure portion. In addition, this outer region 2
A rotation restraining component 12 is provided on 9, and lubrication is performed by lubricating oil supplied to the outer region 29.

When the lubricating oil supplied to the outer region 29 becomes excessive and exceeds the set pressure, the outer region 29 and the compression chamber 32
The back pressure adjusting mechanism 31 formed between the suction space 30 and the suction space 30 is opened to supply the lubricating oil in the outer region 29 to the suction space 30.
To maintain the outer region 29 at a predetermined intermediate pressure. The lubricating oil escaping into the suction space 30 enhances the sealing performance of the compression chamber 32 by the oil film formed by the oil and prevents the leakage of refrigerant gas and the like during compression. It plays the role of lubricating the contact surface.

As described above, in the conventional technique of reducing the hole diameter of the throttle passage of the throttle portion 24 to increase the throttle effect in performing the required pressure reduction, the performance is deteriorated due to clogging with dust or the like mixed in the lubricating oil. May be caused by the first method shown in FIGS. 2, 3 (a), 4 (a) and 5 (a) of the present invention.
In each of the fourth to fourth embodiments, the throttle portions 24, 34, 3
8 and 42 are eliminated by adopting a structure having a spiral throttle passage 33.

As described above, the throttle sections 24, 34, 38, 4
When the second throttle passage 33 has a spiral shape, the length of the throttle passage 33 can be increased several times to several tens times even with the throttle unit 24 having the same length as the conventional one, and the length is increased. The same drawing effect can be obtained even if the hole diameter is increased by the proportion
Higher throttling effect than before in the thicker throttling passage 33 than before, sufficiently enhancing the throttling effect without clogging due to dust mixed in lubricating oil, and high efficiency and stable scroll compressor performance It can be. In addition, processing is easier and lower cost than in the case where the hole diameter is small because the hole diameter may be large.

In the first embodiment shown in FIGS. 1 and 2, the throttle portion 24 is formed by a single plug member 24a, and a spiral throttle passage 33 is formed inside the plug member 24a. The method of forming the throttle passage 33 may be any method. For example, sintering and casting of the metal plug member 24a and molding of the resin plug member 24a are performed so as to surround the spiral core. After that, the core can be removed by removing or eluting the core.
A mounting screw 61 is provided on the cylindrical outer periphery of the plug member 24a, and the swirling spiral part 11
Is screwed from the outside to an opening to the outer periphery of the elongated hole 23 extending to the outer periphery of the swirling spiral part 11 through the inside of the spiral part. A lubricating oil inlet 60 connected to the throttle passage 33 is formed at one end of the plug member 24 a to guide the lubricating oil in the outer region 29 to the throttle passage 33.

The second embodiment shown in FIGS. 3A and 3B is as follows.
As shown in FIG. 3B, a male member 36 having a spiral groove 37 formed on the outer peripheral surface thereof, and a hole 35a into which the male member 36 is inserted.
The narrowed portion 34 is constituted by the female member 35 on which
As shown in (a), the male member 36 is connected to the hole 35a of the female member 35.
, A spiral throttle passage 33 is formed between the spiral groove 37 and the inner surface of the hole 35a. A lubricating oil inlet 60 is provided at one end of the female member 35, and the hole 3
5a, and is connected to the throttle passage 33 through a part of the hole 35a. However, it can be connected directly.

According to the second embodiment, the spiral groove 37 is formed on the open outer peripheral surface of the male member 36 before fitting in the male and female members 35, 36 to be fitted, and the fitting is performed. The spiral groove 37 has the male and female members 35,
36, a spiral throttle passage 33 is formed.
3 becomes easier and the cost is further reduced. In particular, by making the male member 36 a cylindrical body, the male member 36
And processing of the spiral groove 37 and the hole 35a of the female member 35
Can be easily performed with a lathe or the like. A mounting screw 61 similar to that in the first embodiment is formed on the cylindrical outer peripheral surface of the female member 35.

The third embodiment shown in FIGS. 4 (a) and 4 (b)
As shown in FIG. 4B, the spiral groove 4 is formed on the inner peripheral surface of the hole 39a.
1 is formed in the female member 39 in which
(A) and the male member 40 inserted as shown in FIG.
8, the male member 40 is inserted into the hole 39a of the female member 39, thereby forming the spiral groove 41 and the outer peripheral surface 40 of the male member 40.
A spiral throttle passage 33 is formed between the throttle passage 33 and a. Female member 3
9 is provided with a lubricating oil inlet 60 at one end, and the hole 39a
And is connected to the throttle passage 33 through a part of the hole 39a. However, they can be connected directly.

Also in this third embodiment, a spiral groove 41 is formed on the inner peripheral surface of the open hole 39a of the female member 39 before being fitted in each of the male and female members 39, 40 to be fitted. Since the spiral groove 41 becomes the spiral throttle passage 33 between the male and female members 39 and 40 only by performing the alignment,
The processing of the throttle passage 33 becomes easier and the cost is further reduced. Further, similarly to the second embodiment, by forming the male member 40 into a cylindrical body, the processing of the male member 40 and the female member 3 can be performed.
The hole 39a for inserting the male member 40 of 9 and the spiral groove 41 on the inner peripheral surface thereof can be easily processed by a lathe or the like. A mounting screw 61 similar to that in the first and second embodiments is formed on the cylindrical outer peripheral surface of the female member 39.

The fourth embodiment shown in FIGS. 5 (a) and 5 (b)
As shown in FIG. 5B, as in the case of the second embodiment, a male member 44 having a spiral groove 45 formed on the outer peripheral surface and a female member having a hole 43a into which the male member 44 is inserted are formed. Member 4
3 and the male member 44 is inserted into the hole 43a of the female member 43 as shown in FIG. 5 (a), thereby forming a spiral between the spiral groove 45 and the inner surface of the hole 43a. And a slit 46 cut from the end face is provided at the end of the male member 44. A lubricating oil inlet 60 is provided at one end of the female member 43, communicates with the hole 43a, and is connected to the throttle passage 33 through a part of the hole 43a. However, it can be connected directly.

In the fourth embodiment, in addition to exhibiting the same operation and effect as the second embodiment, the male member 44 is provided with a slit 46 cut from the end face at the end thereof, thereby forming a spiral. Even if the spiral throttle passage 33 may be incomplete due to processing failure or subsequent crushing at the end of the male member 44, the spiral throttle passage 33 has a plurality of inner portions from the end through the slits 46. And the flow path of the throttle passage 33 is secured, so that the reliability is high. In the present embodiment, the male member 44 is formed on the lubricating oil inlet 60 side where the lubricating oil flows in. However, it is also effective to form the male member 44 at the opposite end where the lubricating oil flows out. It can also be formed.

Although the present invention uses a positive displacement pump for supplying lubricating oil, the same effect can be obtained when a differential pressure oil supply type pump is used.

[0028]

As is apparent from the above embodiment, according to the first aspect of the present invention, the suction pressure, the compression and the discharge are repeatedly performed in the compression chamber, and the back pressure on the side opposite to the blade surface of the swirling spiral part. In the chamber, lubricating oil is supplied to the inner region and the outer region defined by the seal member to back up the swirling spiral component, and to prevent the swirling spiral component from overturning away from the fixed spiral component, Since the throttle portion which reduces the pressure of the lubricating oil from the inner region and supplies it to the outer region has a spiral throttle passage, even if the throttle portion has the same length as the conventional one, the length of the throttle passage is several times smaller. It can be doubled to several tens of times, and the same throttle effect can be obtained even if the hole diameter is increased by the proportion of the increase in length. Demonstrates and removes trash mixed in lubricating oil Performance of sufficiently enhance the squeezing effect without obstruction occurs scroll compressor can be the intended highly efficient and stable that. In addition, processing is easier and lower cost than in the case where the hole diameter is small because the hole diameter may be large.

The throttle passage is formed by a male member having a spiral groove formed on the outer peripheral surface thereof and a female member having the male member inserted into the hole, or a spiral groove is formed on the inner peripheral surface of the hole. When the female member and the male member inserted into the hole are formed, a spiral groove is formed on the open outer or inner peripheral surface of each of the male and female members to be fitted, and the fitting is performed. The helical groove alone forms a spiral throttle passage between the male and female members, so that the processing of the throttle passage becomes easier and the cost is further reduced.

Further, if a slit cut from the end face is provided at the end of the male member, the helical throttle passage may be incomplete at the end of the male member due to defective processing or subsequent collapse. However, the spiral throttle passage is highly reliable because the portion inside from the end is connected at a plurality of locations through the slit to secure the flow passage of the throttle passage.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing the entire structure of a scroll compressor common to first to fourth embodiments of the present invention.

FIG. 2 is a cross-sectional view illustrating a throttle unit according to the first embodiment of the present invention.

FIGS. 3A and 3B show a throttle unit according to a second embodiment of the present invention, in which FIG. 3A is a sectional view of an assembled state, and FIG. FIG.

FIGS. 4A and 4B show a throttle unit according to a third embodiment of the present invention, in which FIG. 4A is a sectional view of an assembled state, and FIG. FIG.

FIGS. 5A and 5B show a throttle unit according to a fourth embodiment of the present invention, wherein FIG. 5A is a sectional view of an assembled state, and FIG. FIG.

FIG. 6 is a sectional view showing a throttle section of a conventional scroll compressor.

[Explanation of symbols]

 2 Compression mechanism part 3 Electric motor 6 Drive shaft 10 Fixed spiral part 11 Revolving spiral part 12 Rotation restraining part 14 Suction port 15 Discharge port 18 Volumetric pump 19 Lubricating oil sump 20 Oil supply path 21 Inner area 23 Slot 24, 34, 38, 42 throttle part 25 revolving end plate 27 upper surface 28 seal member 29 outer region 30 suction space 32 compression chamber 33 throttle passage 35, 39, 43 female member 36, 40, 44 male member 37, 41, 45 spiral groove 46 slit

Continued on the front page (72) Inventor Akira Hiwada 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. Inventor Kiyoshi Sano 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture F-term (reference) 3H029 AA02 AA14 AA21 AB03 BB06 BB31 BB36 CC33 CC55 3H039 AA03 AA06 AA12 BB07 BB11 BB16 CC27 CC40 CC42

Claims (4)

[Claims] 1. A compression mechanism having a plurality of compression chambers is formed by engaging a fixed spiral component having a fixed spiral blade and a fixed head plate with a rotary spiral component having a swirling spiral blade and a rotary head plate. When the compression chamber moves while changing its volume when constrained rotation and swivels along a circular orbit, suction, compression, and discharge are performed, and at the same time, the blade surface of the swirling spiral part of the compression mechanism is moved. Lubricating oil is supplied to the inner region of the back pressure chamber which is provided on the opposite side and is divided into an inner region and an outer region by a seal member, and the supplied lubricating oil is supplied to the outer region and the compression mechanism via a throttle. In a scroll compressor adapted to supply to a suction space, the throttle portion has a spiral throttle passage. 2. The throttle passage according to claim 1, wherein the throttle passage is formed by a male member having a spiral groove formed on an outer peripheral surface thereof, and a female member having the male member inserted into a hole. The scroll compressor as described. 3. The throttle passage according to claim 1, wherein the throttle passage is formed by a female member having a spiral groove formed on an inner peripheral surface of the hole and a male member inserted into the hole. Scroll compressor. 4. The scroll compressor according to claim 2, wherein a slit cut from an end face is provided at an end of the male member.