CN216381856U

CN216381856U - Bipolar compression scroll structure

Info

Publication number: CN216381856U
Application number: CN202123257151.XU
Authority: CN
Inventors: 曾名勃
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-12-22
Filing date: 2021-12-22
Publication date: 2022-04-26
Anticipated expiration: 2031-12-22

Abstract

The utility model discloses a bipolar compression scroll structure, which comprises a movable scroll and a fixed scroll which are engaged with each other, wherein two sections of relatively independent scroll lines are enclosed by the movable scroll and the fixed scroll, the scroll lines comprise a first scroll line and a second scroll line, and the fixed scroll is positioned on the first scroll line and the second scroll line and is respectively provided with a second exhaust port and a first exhaust port; a first air inlet is arranged between the movable scroll and the fixed scroll, and a second air inlet is arranged on the rear wall of the movable scroll; the gas flows into the first vortex line from the first gas inlet and then flows out through the second gas outlet, and flows into the second vortex line from the second gas inlet and then flows out through the first gas outlet. The bipolar compression function is realized, and the energy efficiency ratio is improved; the working medium after the first-stage compression is output to an external cooler, and enters from a second air inlet after being cooled to continue to be compressed for the second stage. The cooled working medium simultaneously cools mechanisms such as the bearing and the like so as to prolong the service life of the bearing.

Description

Bipolar compression scroll structure

Technical Field

The utility model relates to the technical field of scroll compressors, in particular to a bipolar compression scroll structure.

Background

The existing scroll compressor, especially the oil-free scroll gas compressor, keeps the plane motion of small radius under certain phase place with the movable scroll, the movable scroll engages and forms several pairs of crescent closed compression chambers, the gas sucked into the working chamber is compressed gradually by the crescent formed compression chamber, then discharged from the gas outlet of the center of the fixed disc.

The prior scroll machine is generally a single stage compression, which is performed continuously from suction to discharge in a set of scrolls. If bipolar compression is needed, the existing scheme can only adopt a plurality of groups of scrolls to complete, so that the overall volume of the structural compressor is easily increased, the corresponding energy consumption is increased, and the compression ratio is lower; meanwhile, the temperature of equipment is easily increased due to continuous work in the compression process of unipolar compression, mechanical abrasion is caused, and the service life of the compressor is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a bipolar compression scroll structure, aiming at realizing a bipolar compression function and improving the energy efficiency ratio; and the working medium after the first-stage compression is output to an external cooler and enters from a second air inlet after being cooled to continue to be subjected to second-stage compression. The cooled working medium simultaneously cools mechanisms such as the bearing and the like so as to prolong the service life of the bearing. The temperature of the whole compression mechanism is greatly reduced, the service lives of a sealing piece and a compression part are prolonged, and the purpose of prolonging the service life of the whole compression mechanism is finally achieved.

In order to achieve the above object, the present invention provides a bipolar compression scroll structure, comprising a movable scroll and a fixed scroll which are engaged with each other, wherein the movable scroll and the fixed scroll enclose two sections of relatively independent scroll winding lines including a first scroll winding line and a second scroll winding line, and the first scroll winding line and the second scroll winding line of the fixed scroll are respectively provided with a second exhaust port and a first exhaust port; a first air inlet is arranged between the movable scroll and the fixed scroll, and a second air inlet is arranged on the rear wall of the movable scroll; the gas flows into the first vortex line from the first gas inlet and then flows out through the second gas outlet, and flows into the second vortex line from the second gas inlet and then flows out through the first gas outlet.

According to the technical scheme, after the gas enters the first vortex line through the first gas inlet, the first compression is achieved, then the gas after the first compression directly enters the second gas inlet after passing through the second gas outlet or enters the second gas inlet after passing through an external cooler, then the gas after the first compression can cool the rear wall of the movable scroll and the bearing, then the gas enters the second vortex line through the second gas inlet, the second compression is achieved, and the gas enters corresponding equipment through the first gas outlet. The bipolar compression function is realized, and the energy efficiency ratio is improved; the working medium after the first-stage compression is output to an external cooler, and enters from a second air inlet after being cooled to continue to be compressed for the second stage. The cooled working medium simultaneously cools mechanisms such as the bearing and the like so as to prolong the service life of the bearing. The temperature of the whole compression mechanism is greatly reduced, the service lives of a sealing element and a compression part are prolonged, and the purpose of prolonging the service life of the whole compression mechanism is finally achieved; wherein the scheme is also applicable to the structure of the double type scroll.

Drawings

FIG. 1 is a cross-sectional view of the present invention;

FIG. 2 is a side sectional view of the first embodiment of the present invention;

FIG. 3 is a side cross-sectional view of the first embodiment of the present invention;

FIG. 4 is a schematic view of the orbiting scroll;

FIG. 5 is a schematic view of a fixed scroll configuration;

fig. 6 is an exploded view of the present invention.

In the figure, 1. the first section of the orbiting scroll; 2. a fixed scroll first section; 3. a second section of the fixed scroll; 4. a second exhaust port; 5. a second section of orbiting scroll; 6. a second air inlet; 61. a first air inlet; 7. a first exhaust port; 8. a movable vortex disc; 9. fixed scroll; 10. a bearing; 11. a second partition wall; 12. the first partition wall, 100 is the first vortex line, 200 is the second vortex line, 300 is the cooler.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that if directional indications (such as … …, which is up, down, left, right, front, back, top, bottom, inner, outer, vertical, transverse, longitudinal, counterclockwise, clockwise, circumferential, radial, axial) are provided in the embodiments of the present invention, the directional indications are only used for explaining the relative position relationship, motion condition, etc. of the components at a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description relating to "first" or "second", etc. in the embodiments of the present invention, the description of "first" or "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

As shown in fig. 1 to 6, a double-pole compression scroll structure comprises an orbiting scroll 8 and a fixed scroll 9 which are engaged with each other, wherein the orbiting scroll 8 and the fixed scroll 9 are enclosed into two sections of relatively independent scroll winding lines including a first scroll winding line 100 and a second scroll winding line 200 (i.e. two relatively independent compression channels are formed in one compression scroll), and the first scroll winding line 100 and the second scroll winding line 200 of the fixed scroll 9 are respectively provided with a second exhaust port 4 and a first exhaust port 7; a first air inlet 61 is arranged between the movable scroll 8 and the fixed scroll 9, and a second air inlet 6 is arranged on the rear wall of the movable scroll 8; the gas flows into the first scroll line 100 from the first gas inlet 61, flows out through the second gas outlet 4, flows into the second scroll line 200 from the second gas inlet 6, and flows out through the first gas outlet.

Specifically, after gas enters into first vortex line 100 through first air inlet 61, first compression has been realized, then gas after first compression directly enters into second air inlet 6 or enters into second air inlet 6 after through external cooler 300 after passing through second gas vent 4, then gas through first compression can cool down to the back wall and the bearing 10 that move vortex 8, then rethread second air inlet 6 enters into second vortex line 200 after, realize the second compression, rethread first gas vent 7 enters into corresponding equipment. The bipolar compression function is realized, and the energy efficiency ratio is improved; the working medium after the first-stage compression is output to the external cooler 300, and enters from the second air inlet 6 after being cooled to continue the second-stage compression. The cooled working medium simultaneously cools mechanisms such as the bearing 10 and the like so as to prolong the service life of the bearing 10. The temperature of the whole compression mechanism is greatly reduced, the service lives of the sealing element and the compression part are prolonged, and the purpose of prolonging the service life of the whole compression mechanism is finally achieved.

In the present embodiment, the orbiting scroll 8 includes an orbiting scroll first section 1 and an orbiting scroll second section 5; the fixed scroll 9 includes a fixed scroll first section 2 and a fixed scroll second section 3. The present example is explained in terms of the second and first sections of the swirl line being based on the same base circle and the same start, provided that in practice the two sections of the swirl line are guaranteed to have the same radius of gyration.

The basic parameters of the circle involute scroll profile in this example are as follows.

Wherein: radius of base circle a

Vortex wall thickness T

Initial angle of gradual lineα

Vortex pitch P

Radius of gyration R = P/2-T

Involute spread angle phi of central plane of vortex

Final spread angle phi 2 of middle part of second involute section of central surface of vortex

Initial spread angle phi 1 of first section middle part of involute of central plane of vortex

First section outermost spread angle phi E of involute of central plane of vortex

Scroll profile equation

X=a*(cos(t)+t*sin(t))

Y=a*(sin(t)-t*cos(t))

For convenience of description, we define only the central vortex line, with the inner and outer lines equally dividing the two sides by the wall thickness T.

Vortex molded line variable 0< t < phi 2 of the second section

The first section of the vortex type line variable Φ 1< t < Φ E,

where Φ 2< Φ 1.

The vortex line between Φ 2 and Φ 1 will be cut and shaped.

The position of Φ 1 needs to be determined according to the kind of gas and the required compression ratio.

The profile of the fixed scroll 9 here requires a larger position for the discharge port because of the need to discharge the gas from the second discharge port outwardly. The movable scroll 8 is arranged to be small-sized and the fixed scroll 9 is arranged to be large-sized according to the meshing requirement.

In this example, the movable scroll 8 is modified by a circular arc having a wall thickness of R1= T/2, and the corresponding fixed scroll 9 is modified by R2 = T/2+ R (radius of gyration) to ensure meshing.

In practice, involute successive modification with the same radius of gyration can also be used. The utility model does not describe the modifications.

The second exhaust port is arranged in the position offset from the tail end of the middle part so as to exhaust fully as far as possible. A check valve (not shown in this example) may be provided outside the exhaust port as necessary.

The profile of the orbiting scroll 8 here requires a larger position as the intake port because of the need to intake air from the first intake port. Engagement is not actually required here. In the embodiment, the fixed scroll 9 is shaped according to the arc with the wall thickness R1 being not less than T/2, and the corresponding movable scroll 8 is shaped according to the arc with the wall thickness R2 being not less than T/2+ R (radius of gyration), and a section of larger space is arranged to be beneficial to air suction.

The outer ring of the second movable scroll (from Φ 2 to Φ 2-2 π) is not engaged with the fixed scroll 9, and a certain gap is provided. The gap also serves as insulation.

The second section scroll is modified at its center in accordance with the prior art.

The movable scroll 8 and the fixed scroll 9 of the present embodiment are both provided with the first partition wall 12, so that the first-stage compressed gas and the second-stage intake gas are well separated, and a better heat insulation effect is achieved. In fact, the second-stage compression function can be achieved by providing only one first partition wall 12 between the movable scroll 8 and the fixed scroll 9.

Although the suction volume of the second stage compression is small compared with the exhaust volume of the first stage compression, the corresponding volume of the gas is also small after the gas is cooled by external cooling and isobaric temperature reduction, so that the method is feasible.

The scroll winding of the same scroll plate is composed of two sections, the first section (1, 2) is unfolded from the middle part to the outer circle part, the second section (3, 5) is unfolded from the center part to the middle part, and a first partition wall 1211 is arranged between the two sections of scrolls. An exhaust port 1 is arranged at the middle part of the fixed scroll 9, and an exhaust port 2 is arranged at the central part; an intake port 1 is provided in the middle of the orbiting scroll 8. The gas is sucked from the outermost suction port and is compressed to the exhaust port 1 through the first stage and is discharged. The gas cooled by the external cooler 300 enters the bearing 10 cooled on the back of the orbiting scroll 8 to form a back pressure P2, enters from the gas inlet 1, is compressed by the second stage to the gas outlet 2 and is discharged.

The gas pressure P2 after being cooled by the external cooler 300 can be utilized to set a closed middle cavity between the movable scroll 8 and the machine base 12, so that a back pressure structure is formed, namely, the movable scroll 8 can realize full-floating operation, and the operation efficiency is greatly improved. Meanwhile, the efficiency of the two-stage compression is higher than that of the single-stage compression, the temperature of the middle cavity and the temperature of the whole scroll machine are greatly reduced by the gas subjected to middle cooling, and the service lives of parts such as a bearing 10, scrolls, a sealing element and the like are greatly prolonged.

The present example is set forth in terms of the second and first sections of the vortex line being based on the same base circle and the same start. But this solution does not require necessarily the same line of occurrence. The scroll bodies are arranged in a segmentation manner in the same plane, the peripheral molded line and the internal molded line can not be the same generation line, or the same base circle radius, or even different types of involute curves, and can be different tooth heights, and only the same turning radius is required to be ensured. This example uses the same base circle generating line for ease of illustration only. The design scheme greatly improves the design flexibility of the scroll machine.

In the present embodiment, an external cooler 300 is disposed between the second exhaust port and the second intake port 6. After the compressed gas passes through the external cooler 300, the temperature of the gas is lowered to cool the rear wall of the orbiting scroll 8 and the bearing 10, and then the gas enters the second scroll line 200.

In the embodiment of the present invention, the movable scroll 8 is installed on the base, the movable scroll and the base form a closed cavity, and the gas flows into the second scroll line after entering from the closed cavity, that is, a relatively closed cavity is further provided between the first scroll line and the second scroll line, although the first scroll line and the second scroll line may also be directly connected.

In the embodiment of the present invention, the gas is cooled by the external cooler 300 and then enters the back surface of the movable scroll 8 of the compressor to form a back pressure, so that the movable scroll 8 is operated in a floating manner. Thereby reducing the friction between the movable scroll 8 and the fixed scroll 9 and improving the service life of the scrolls.

In the embodiment of the present invention, the first scroll line 100 extends spirally outward with the second exhaust port 4 as a base point; the second scroll line 200 extends spirally outward toward the second exhaust port 4 with the first exhaust port 7 as a base point.

In the embodiment of the present invention, a first partition wall 12 is disposed between the first section 1 of the orbiting scroll and the second section 5 of the orbiting scroll; a second partition wall 11 is provided between the fixed scroll first section 2 and the fixed scroll second section 3.

In the embodiment of the utility model, the first section 1 of the movable scroll and the first section 2 of the fixed scroll have the same radius of gyration; the second section 5 of the orbiting scroll is the same as the second section 3 of the fixed scroll in radius of gyration. By the same radius of gyration, even if the scroll bodies are arranged in a same plane in a subsection way, the peripheral molded line and the internal molded line can be involutes of different types.

In the embodiment of the utility model, the scroll bodies are arranged in a same plane in a subsection mode, and the scroll bodies can be discharged after peripheral compression.

In the embodiment of the utility model, the scroll bodies are arranged in a same plane in a segmented manner, the peripheral molded line and the internal molded line can be different from the same generating line or different base circle radiuses, even different types of involutes and different tooth heights, and only the same radius of gyration is required to be ensured.

In the embodiment of the utility model, the scroll body is arranged in a same plane in a segmented manner, the peripheral molded line and the internal molded line can be involutes of different types, and only the same turning radius is required to be ensured.

In the embodiment of the utility model, the scroll bodies are arranged in a same plane in a segmented manner, the peripheral molded line and the internal molded line can be different in tooth height, and only the same turning radius is required to be ensured.

In the embodiment of the present invention, the scroll line of the same scroll is composed of two sections, the first section is expanded from the middle portion to the outer circular portion, the second section is expanded from the middle portion to the middle portion, and a first partition wall 12 is provided between the two sections of at least one of the orbiting scroll 8 and the fixed scroll 9, preferably on the fixed scroll 9.

In the embodiment of the present invention, the spiral line of the same scroll is composed of two sections, the first section is expanded from the middle portion to the outer circle portion, the second section is expanded from the center portion to the middle portion, and the fixed scroll 9 is provided with the first partition wall 12 to be engaged and modified.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the technical solutions of the present invention, which are made by using the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A bipolar compression scroll structure is characterized by comprising a movable scroll and a fixed scroll which are engaged with each other to move, wherein two sections of independent scroll lines surrounded by the movable scroll and the fixed scroll comprise a first scroll line and a second scroll line, and a second exhaust port and a first exhaust port are respectively arranged on the first scroll line and the second scroll line of the fixed scroll; a first air inlet is arranged between the movable scroll and the fixed scroll, and a second air inlet is arranged on the rear wall of the movable scroll; the gas flows into the first vortex line from the first gas inlet and then flows out through the second gas outlet, and flows into the second vortex line from the second gas inlet and then flows out through the first gas outlet.

2. A bipolar scroll compressor as in claim 1, wherein: the orbiting scroll includes an orbiting scroll first section and an orbiting scroll second section; the fixed scroll includes a fixed scroll first section and a fixed scroll second section.

3. A bipolar scroll compressor as in claim 1, wherein: an external cooler is arranged between the second air outlet and the second air inlet.

4. A bipolar scroll compressor as in claim 1, wherein: the movable scroll is arranged on the base, the movable scroll and the base form a closed cavity, and gas flows into the second scroll line after entering from the closed cavity.

5. A bipolar scroll compressor as in claim 1, wherein: the gas is cooled by an external cooler and then enters the back of the movable scroll of the compressor to form back pressure, so that the movable scroll can float and operate.

6. A bipolar scroll compressor as in claim 1, wherein: the first vortex line extends outwards in a spiral mode by taking the second exhaust port as a base point; the second vortex line extends outward spirally toward the second exhaust port with the first exhaust port as a base point.

7. A bipolar scroll compressor as in claim 2, wherein: a first partition wall is arranged between the first section of the movable scroll and the second section of the movable scroll; a second partition wall is disposed between the first section of the fixed scroll and the second section of the fixed scroll.

8. A bipolar scroll compressor as in claim 2, wherein: the first section of the movable scroll and the first section of the fixed scroll have the same radius of gyration; the second section of the movable scroll has the same radius of gyration as the second section of the fixed scroll.

9. A bipolar scroll compressor as in claim 1, wherein: the first vortex line and the second vortex line are fluid compression channels.

10. A bipolar scroll compressor as in claim 1, wherein: the first vortex winding line and the second vortex winding line are connected through an intermediate piece or directly connected.