CN109098966B

CN109098966B - Vortex tooth structure of oil-free vortex compressor

Info

Publication number: CN109098966B
Application number: CN201810931116.5A
Authority: CN
Inventors: 彭斌; 方圆力
Original assignee: Lanzhou University of Technology
Current assignee: Lanzhou University of Technology
Priority date: 2018-08-15
Filing date: 2018-08-15
Publication date: 2020-04-10
Anticipated expiration: 2038-08-15
Also published as: CN109098966A

Abstract

The invention belongs to the technical field of scroll compressors, and particularly relates to a scroll wrap structure of an oil-free scroll compressor. The specific technical scheme is as follows: the utility model provides a vortex tooth structure, is including moving vortex dish and quiet vortex dish, move and be equipped with first vortex tooth and second vortex tooth on vortex dish and the quiet vortex dish respectively, the flank of tooth of first vortex tooth and second vortex tooth sets up the tooth's socket, inwards from the outer lane along the direction of rotation of first vortex tooth or second vortex tooth, the tooth's socket is divided into the three-section in proper order by the division board: a low pressure zone, a medium pressure zone, and a high pressure zone; low pressure region > medium pressure region > high pressure region by length; and a sealing strip is also arranged in the tooth groove. The invention creatively designs different scroll wraps aiming at the characteristics of different partitions, effectively improves the sealing efficiency of the axial clearance of the scroll plate, saves the manufacturing raw materials of the scroll wraps and provides a brand new thought for the development and design of oil-free scroll compressors.

Description

Vortex tooth structure of oil-free vortex compressor

Technical Field

The invention belongs to the technical field of scroll compressors, and particularly relates to a scroll wrap structure of an oil-free scroll compressor.

Background

Following reciprocating compressor, rotor compressor, screw compressor, scroll compressor is known as a new high-efficient positive displacement compressor. Compared with other types of compressors, the scroll compressor has the characteristics of few parts, compact structure, low noise, low vibration, high efficiency, high reliability and the like. The types and parameters of the scroll wraps of the scroll compressor directly influence important parameters such as geometry, mechanics, thermodynamics, power consumption and efficiency, and important technical indexes such as processing performance, abrasion, service life and noise, and are key and difficult points of design and development of the scroll compressor.

In the movement process of the scroll compressor, the movable scroll disk and the fixed scroll disk are continuously engaged to compress and discharge sucked gas. Because the scroll plates have certain errors in the manufacturing and mounting processes and can deform under the action of heat, force and the like during operation, inevitable axial gaps and radial gaps can be generated among the scroll plates, and further, radial leakage and tangential leakage of gas are caused, so that the compression efficiency of the scroll plates is reduced.

Leakage of gas from the compression chamber is from a high pressure region to a low pressure region. The length of the leakage line of the tangential leakage caused by the radial clearance is twice the height of the wrap of the scroll; the length of the leakage line of the radial leakage caused by the axial clearance is the length of the central line of the wall thickness of the vortex body, so the leakage line of the radial leakage is much longer than that of the tangential leakage, and the control of the radial leakage also becomes a key factor for improving the efficiency of the compressor.

At present, the scroll wraps in the whole circle of scroll wraps are all in the same specification; however, as mentioned above, because the pressures in different areas of the compression chamber are different, the deformation degree of the scroll wrap is also different, and if the entire scroll wrap adopts the same specification, it is obviously impossible to seal the axial gaps in different pressure areas.

Disclosure of Invention

The invention aims to provide a scroll wrap structure of an oil-free scroll compressor.

In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows: a scroll wrap structure of an oil-free scroll compressor comprises a movable scroll and a fixed scroll, wherein a first scroll wrap and a second scroll wrap are respectively arranged on the movable scroll and the fixed scroll,

tooth surfaces of the first vortex tooth and the second vortex tooth are provided with tooth grooves, the tooth grooves are inwards from the outer ring along the rotating direction of the first vortex tooth or the second vortex tooth, and the tooth grooves are sequentially divided into three sections by the partition plates: a low pressure zone, a medium pressure zone, and a high pressure zone; low pressure region > medium pressure region > high pressure region by length;

and a sealing strip is also arranged in the tooth groove.

Preferably, the tooth slot is divided into three sections by partition plates: and taking the length of the first scroll wrap or the second scroll wrap as the total length, wherein the low-pressure area extends inwards from the outer ring to the total length of 9/20-1/2 from the outermost end of the first scroll wrap or the second scroll wrap, the medium-pressure area extends inwards to the total length of 3/10-7/20 from the terminal point of the low-pressure area, and the balance is the high-pressure area.

Preferably, the tooth slot is divided into three sections by partition plates: and taking the length of the first scroll wrap or the second scroll wrap as the total length, the low-pressure area is formed by extending the outermost end of the first scroll wrap or the second scroll wrap inwards from the outer ring to the position with the total length 1/2, the medium-pressure area is formed by extending the terminal point of the low-pressure area inwards to the position with the total length 3/10, and the rest part is the high-pressure area.

Preferably, the tooth height of the first scroll wrap or the second scroll wrap at any point a in the low pressure region is:

the tooth height of the first scroll wrap or the second scroll wrap at any point B in the middle pressure area is as follows:

the tooth height of the first scroll wrap or the second scroll wrap at any point C in the high-pressure area is as follows:

the tooth thickness of the first scroll wrap or the second scroll wrap at any point A in the low-pressure area is as follows:

the tooth thickness of the first scroll wrap or the second scroll wrap at any point B in the intermediate pressure area is as follows:

the tooth thickness of the first scroll wrap or the second scroll wrap at any point C in the high-pressure area is as follows:

the height of the sealing strip corresponding to any point A in the low-pressure area is as follows:

the height of the sealing strip corresponding to any point B in the middle pressure area is as follows:

the height of the sealing strip corresponding to any point C in the high-pressure area is as follows:

the original tooth height refers to the tooth height of the outermost ring of the first scroll wrap or the second scroll wrap;

the original tooth thickness refers to the tooth thickness of the outermost ring of the first vortex tooth or the second vortex tooth;

the original height refers to the height of the sealing strip of the outermost ring of the first scroll wrap or the second scroll wrap;

the total radian is a total radian value which is wound by the first scroll wrap or the second scroll wrap;

the radian of the point A refers to the radian of the first scroll wrap or the second scroll wrap where the point A is located;

the radian of the point B refers to the radian of the first scroll wrap or the second scroll wrap where the point B is located;

the radian of the point C refers to the radian of the first scroll wrap or the second scroll wrap where the point C is located.

Preferably, the material of the partition plate is the same as that of the first scroll wrap or the second scroll wrap; after tooth grooves are formed in the tail ends of the first scroll wrap or the second scroll wrap, the partition plate is fixedly connected to the corresponding position.

Preferably, the material of the first scroll wrap or the second scroll wrap at the location of the divider plate is retained during the manufacture of the tooth grooves of the first scroll wrap or the second scroll wrap.

Preferably, the thickness of the separating plate is 1/5 the original tooth thickness of the first or second scroll wrap.

The invention has the following beneficial effects:

the invention creatively carries out partition design aiming at the scroll teeth of the oil-free scroll compressor, and solves the problem that the tooth surface is not processed in a partition mode according to different pressures when the existing scroll route is designed, so that the air tightness is poor. The high pressure area, the middle pressure area and the low pressure area are subjected to different temperatures and pressures, and the deformation generated by the scroll wrap is naturally different. As the scroll movement time increases, the amount of differential deformation of the wrap will cause the sealing effect on the compressed gas to decrease, thereby reducing the operating efficiency of the compressor. On the basis of partitioning the scroll wrap, different scroll wrap lines are designed according to the characteristics of different partitions, so that the sealing efficiency of the axial clearance of the scroll plate can be effectively improved, and the manufacturing raw materials of the scroll wrap are saved.

Drawings

FIG. 1 is a schematic view of a scroll compressor;

FIG. 2 is a schematic view of the orbiting scroll section on the fixed scroll;

FIG. 3 is a sectional view of the scroll wrap;

FIG. 4 is a schematic elevation of the wrap tooth height;

FIG. 5 is a schematic thickness of the wrap of the scroll;

FIG. 6 is a schematic view of the height of the seal strip on the scroll wrap.

Detailed Description

As shown in fig. 1, 2 and 3, the oil-free scroll compressor includes a movable scroll 1 and a fixed scroll 2, and the movable scroll 1 and the fixed scroll 2 are respectively provided with a first wrap 41 and a second wrap 42. The tail ends of the first scroll wrap 41 and the second scroll wrap 42 are provided with tooth grooves, and sealing strips 3 are fixedly connected inside the tooth grooves. Since the first scroll lap 41 and the second scroll lap 42 are symmetrically distributed and have the same structure and material, the first scroll lap 41 will be described below as an example, but actually both refer to the first scroll lap 41 and the first scroll lap 42.

According to the pressure value of the first scroll wrap 41, the first scroll wrap is divided into three areas from the outermost end (i.e. the suction end of the oil-free scroll compressor) inwards in sequence: a low pressure region 51, a medium pressure region 52 and a high pressure region 53. The specific division method is as follows: taking the length of the first scroll wrap 41 as the total length, extending inward from the outermost end/outermost turn of the first scroll wrap 41 to a length of 5 total lengths 9/20-1/2 is a low pressure region 51, extending inward from the end point of the low pressure region 51 to a length of 3/10-7/20 is a medium pressure region 52, and the remaining portion, the length of 3/20-1/4 is a high pressure region 53. The more preferable dividing method is as follows: extending inward from the outermost end to a length of total length 1/2 is low pressure region 51, extending inward from the terminus of low pressure region 51 to a length of total length 3/10 of first wrap 41 is intermediate pressure region 52, and the remainder, up to a length of total length 1/5, is high pressure region 53.

The three regions are divided by the partition plate 6 to form three mutually independent sections in which gas of different pressures in the tooth grooves of the first scroll wraps 41 do not flow into each other. The partition plate 6 is located inside the tooth groove of the first scroll wrap 41, and divides the sealing strip 3 into 3 parts independent of each other. The thickness of the partition plate 6 is 1/5 the original tooth thickness of the first scroll wrap 41. The partition plate 6 can be made of the material of the first scroll wrap 41 alone, and after the tooth groove of the first scroll wrap 41 is made, the made partition plate 6 is fixedly connected/glued to the corresponding position; when the first scroll lap 41 is manufactured, the partition plate 6 may be directly formed of the material of the first scroll lap 41 without removing the position corresponding to the partition plate 6.

As shown in fig. 4, the tooth height of first scroll lap 41 is H1 (hereinafter referred to as tooth height H1). Since the amount of deformation of seal strip 3 is larger as seal strip 3 is closer to the center of first scroll wrap 41, the more the pressure and temperature are affected, and a sufficient axial deformation space is reserved.

Taking the preferred division of the first scroll wrap 41 into zones (i.e., 1/2 for the

low pressure zone

51, 3/10 for the medium pressure zone 52, and 1/5 for the high pressure zone 53), the calculation of the tooth height, tooth thickness, and seal 3 thickness at any point in each zone is derived as follows. The derivation is the same when the first wrap 41 region is divided into non-preferred divisions.

In the region of low pressure zone 51, the tooth height H1 at the outermost end of first scroll wrap 41 is the original tooth height, and the tooth height H1 at the innermost end of low pressure zone 51 is 99.9% of the original tooth height. In this region, the tooth height H1 has a tendency to smoothly decline.

The tooth height H1 at any point A in low-pressure region 51 is:

the derivation of the above formula is:

(1) through repeated measurement and experiments, the inventor finds that the total deformation amount of each subarea scroll wrap 4 is one thousandth of the initial value, and the tooth height of the terminal point of the low-pressure area 51 (namely the joint of the low-pressure area 51 and the middle-pressure area 52) is 99.9% of the original tooth height by setting the initial tooth height of the low-pressure area 51 to be the original tooth height; the final tooth height of intermediate pressure zone 52 is 99.9% of the final tooth height of low pressure zone 51, and so on.

(2) The overall tooth height H1 of low-pressure region 51 decreases uniformly and linearly, with an overall decreasing slope a: (99.9% original tooth height-original tooth height)/length of low-pressure region 51; wherein low pressure region 51 has a length 1/2 of the total arc length of first wrap 41; therefore, a is 0.001 original tooth height/0.5 total arc length. Setting the radian of the point A as X and the radian of the initial point of the low-pressure area as X'; the tooth height at point A is Y, and the tooth height at the beginning of the low-pressure region 51 is Y'. Then the equation exists: a (X-X ') ═ Y-Y', a being the slope found above. Because X 'is 0 and Y' is the original tooth height, the calculation formula of the tooth height of the point A can be obtained by reasoning. The following formula for calculating the tooth height H1 at any point in the intermediate pressure zone 52 and the high pressure zone 53, the formula for calculating the tooth thickness H2 in each zone, and the formula for calculating the seal height H3 in each zone were obtained in the same manner.

At the boundary between the medium pressure zone 52 and the low pressure zone 51, the tooth height is 99.9% of the original tooth height, and to the end of the medium pressure zone 52, the tooth height is 99.8% of the original tooth height, during which the tooth height still shows a smooth downward trend. The tooth height H1 at any point B in intermediate pressure region 52 is:

at the intersection of high pressure zone 53 and intermediate pressure zone 52, the tooth height H1 is 99.8% of the original tooth height, up to the centermost tooth height of first wrap 41 is 99.7% of the original tooth height, and the tooth height H1 at any point C in high pressure zone 53 is:

the tendency for tooth height H1 to decrease increases as each zone gets closer to the center of first scroll wrap 41 to ensure that more deformation space is reserved as pressure increases.

Fig. 5 is a schematic view showing the tooth thickness H2 (hereinafter referred to as tooth thickness H2) of the first scroll lap 41. Referring to the variation law of the tooth height H1, the outermost tooth thickness in the low-pressure region 51 is still the original tooth thickness, and to the end of the low-pressure region 51, the tooth thickness is 99.9% of the original tooth thickness. In the low-pressure region 51, the tooth thickness H2 at any point a is:

the tooth thickness at the junction of the low pressure region 51 and the intermediate pressure region 52 is 99.9% of the original tooth thickness, and the tooth thickness H2 at any point B in the intermediate pressure region 52 is:

the tooth thickness at the intersection of the medium pressure zone 52 and the high pressure zone 53 is 99.8% of the original tooth thickness, and the tooth thickness H2 at any point C in the high pressure zone 53 is:

to the centermost point of first wrap 41, tooth thickness H2 is 99.7% of the original tooth thickness. The tooth thickness H2 in between is in the same smooth downward trend as the tooth height H1.

The height H3 of seal 3 secured to scroll wrap 4 is shown in fig. 6. In low pressure zone 51, seal 3 height H3 increases uniformly from its original height to 100.1% of its original height, where point A seal 3 height H3 is:

by the range of intermediate pressure zone 52, weatherstrip 3 height H3 increases uniformly from 100.1% of the original height to 100.2%, where point B weatherstrip 3 height H3 is:

by high pressure zone 53, seal height H3 increases uniformly from 100.2% to 100.3% of original height H3, where point C seal 3 height H3 is:

note that the point A, B, C refers to any point (including each area end point) in each partitioned area, and is not particularly limited to a certain point.

The above description is only for the preferred embodiments of the present invention, and is not intended to limit the present invention in any way, and all equivalent modifications or variations made to the above embodiments according to the technical spirit of the present invention are within the scope of the present invention.

Claims

1. The utility model provides an oil-free scroll compressor's vortex tooth structure, is including moving vortex dish (1) and quiet vortex dish (2), move and be equipped with first vortex tooth (41) and second vortex tooth (42) on vortex dish (1) and quiet vortex dish (2) respectively, its characterized in that:

tooth surfaces of the first scroll (41) and the second scroll (42) are provided with tooth grooves, the tooth grooves are inwards from the outer ring along the rotating direction of the first scroll (41) or the second scroll (42), and the tooth grooves are sequentially divided into three sections by the partition plate (6): a low pressure zone (51), a medium pressure zone (52) and a high pressure zone (53); low pressure zone (51) > mid pressure zone (52) > high pressure zone (53) by length;

a sealing strip (3) is also arranged in the tooth groove;

the tooth grooves are divided into three sections by partition plates (6): taking the length of the first scroll wrap (41) or the second scroll wrap (42) as the total length, extending inwards from the outer ring to the total length 9/20-1/2 from the outermost end of the first scroll wrap (41) or the second scroll wrap (42) to form a low-pressure area (51), extending inwards from the terminal point of the low-pressure area (51) to the total length 3/10-7/20 to form a medium-pressure area (52), and taking the rest part of the high-pressure area (53);

the tooth height of the first scroll wrap (41) or the second scroll wrap (42) at any point A in the low-pressure area (51) is as follows:

the tooth height of the first scroll wrap (41) or the second scroll wrap (42) at any point B in the intermediate pressure area (52) is as follows:

the tooth height of the first scroll wrap (41) or the second scroll wrap (42) at any point C in the high-pressure region (53) is as follows:

the tooth thickness of the first scroll wrap (41) or the second scroll wrap (42) at any point A in the low pressure region (51) is as follows:

the tooth thickness of the first scroll (41) or the second scroll (42) at any point B in the middle pressure area (52) is as follows:

the tooth thickness of the first scroll wrap (41) or the second scroll wrap (42) at any point C in the high-pressure region (53) is as follows:

the height of the sealing strip (3) corresponding to any point A in the low-pressure area (51) is as follows:

the height of the sealing strip (3) corresponding to any point B in the middle pressure area (52) is as follows:

the height of the sealing strip (3) corresponding to any point C in the high-pressure area (53) is as follows:

wherein the original tooth height refers to the tooth height of the outermost ring of the first scroll wrap (41) or the second scroll wrap (42);

the original tooth thickness refers to the tooth thickness of the outermost ring of the first scroll wrap (41) or the second scroll wrap (42);

the original height refers to the height of the sealing strip (3) at the outermost ring of the first scroll wrap (41) or the second scroll wrap (42);

the total radian is a total radian value which is bypassed by the first scroll wrap (41) or the second scroll wrap (42);

the radian of the point A refers to the radian of the first scroll wrap (41) or the second scroll wrap (42) where the point A is located;

the radian of the point B refers to the radian of the first scroll wrap (41) or the second scroll wrap (42) where the point B is located;

the radian of the point C refers to the radian of the first scroll wrap (41) or the second scroll wrap (42) where the point C is located.

2. The scroll wrap structure of claim 1, wherein: the tooth grooves are divided into three sections by partition plates (6): taking the length of the first scroll wrap (41) or the second scroll wrap (42) as the total length, extending inward from the outer ring to the length 1/2 from the outermost end of the first scroll wrap (41) or the second scroll wrap (42) is a low pressure region (51), extending inward to the length 3/10 from the end point of the low pressure region (51) is a medium pressure region (52), and the remainder is a high pressure region (53).

3. The scroll wrap structure of claim 1, wherein: the material of the partition plate (6) is the same as that of the first scroll lap (41) or the second scroll lap (42); after tooth grooves are formed at the tail ends of the first scroll lap (41) or the second scroll lap (42) completely, the partition plate (6) is fixed to a corresponding position.

4. The scroll wrap structure of claim 1, wherein: when the tooth grooves of the first scroll wrap (41) or the second scroll wrap (42) are manufactured, the material of the first scroll wrap (41) or the second scroll wrap (42) at the position of the partition plate (6) is reserved.

5. The scroll wrap structure of claim 1, wherein: the thickness of the partition plate (6) is 1/5 of the original tooth thickness of the first scroll wrap (41) or the second scroll wrap (42).