CN118008793A - A scroll compressor with axially flexible structure - Google Patents

Abstract

The present invention discloses a scroll compressor with an axially flexible structure. An annular eccentric groove corresponding to the corresponding operating angle of the crankshaft is opened on a support seat, and matched with a spring ring sheet made of elastic material, a movable scroll plate is placed on the suspended part of the spring ring sheet. The deformation of the spring ring sheet will generate an axial elastic force on the movable scroll plate, and when the movable scroll plate is subjected to different gas axial forces at different operating angles, the length of the empty part of the spring ring sheet can be accurately adjusted by controlling the size of the annular eccentric groove of the support seat, so as to accurately adjust the elastic force of the spring ring sheet on the movable scroll plate, thereby accurately balancing the axial forces on the movable scroll plate at different times within a rotation cycle, solving the problems of large gap and large friction between the movable scroll plate and the fixed scroll plate, and improving the efficiency of the compressor.

Description

A scroll compressor with axially flexible structure

Technical Field

The invention belongs to the technical field of scroll compressors, and in particular relates to a scroll compressor with an axially flexible structure.

Background technique

A scroll compressor is a type of positive displacement compressor. The compression components consist of a movable scroll and a fixed scroll. During the compression process, the relative orbital motion of the movable and fixed scrolls is used to form a continuous change in the closed volume, thereby achieving the purpose of compressing the gas. Because the closed chamber formed when the movable and fixed scrolls are engaged has a certain gas pressure, the movable scroll will be subjected to an axial gas force in the opposite direction of the fixed scroll during compression. In order to increase the life of the bearing, reduce the damage of the axial force to the bearing in high-speed operation, and reduce the wear of the scroll and leakage in the compression chamber caused by unbalanced axial force, it is particularly necessary to adopt a structural design that can balance the axial gas force of the movable scroll.

Most existing scroll compressor designs adopt a back pressure chamber structure. By installing a mounting frame, shaft seal and other components on the back of the movable scroll, a closed chamber is formed on the back of the movable scroll. The intermediate pressure refrigerant between the suction pressure and the exhaust pressure is introduced into this closed chamber. Due to the existence of gas pressure, an axial thrust toward the fixed scroll is generated on the movable scroll to balance the axial gas force generated by the compression chamber. Due to the characteristics of the scroll compressor itself, the pressure in the compression chamber will fluctuate accordingly with the rotation angle of the crankshaft within a rotation cycle. When the crankshaft does not rotate to the exhaust angle, the gas pressure in the compression chamber gradually increases. When the crankshaft rotates to the exhaust angle, the gas pressure in the compression chamber gradually decreases. Therefore, within a complete rotation cycle, the gas pressure increases first and then decreases, so the gas axial force on the movable scroll caused by the gas pressure will also fluctuate. However, the pressure of the back pressure chamber of the compressor is in a constant state to a certain extent. Therefore, when the gas pressure in the compression chamber is small, the back pressure on the movable scroll is greater than the gas pressure, and the top and bottom of the scroll teeth are in a compressed state, which increases the friction of operation. When the gas pressure in the compression chamber is large, the back pressure on the movable scroll is less than the gas pressure, and the top and bottom of the scroll teeth are in a gap state, which affects the working efficiency of the compressor.

Therefore, it is necessary to propose a new scroll compressor with an axially flexible structure to solve the problem in the prior art that the axial clearance fluctuates due to the pressure fluctuation in the scroll plate, and the compressor performance is reduced due to large axial clearance or large axial friction.

Summary of the invention

The present invention provides a scroll compressor with an axially flexible structure, which can solve the problem in the prior art that the axial clearance fluctuates due to the pressure fluctuation in the scroll plate, and the compressor performance decreases due to the large axial clearance or large axial friction.

To solve the above problems, the technical solution provided by the present invention is as follows:

An embodiment of the present invention provides a scroll compressor with an axially flexible structure, which includes a compressor housing, a crankshaft and a support seat are arranged in the compressor housing, the support seat is connected to the upper part of the crankshaft through a bearing, a movable scroll and a fixed scroll are arranged on the support seat, the movable scroll is connected to the crank of the crankshaft, the movable scroll moves relative to the fixed scroll, forming a continuous change of the closed volume, thereby achieving the purpose of compressing gas;

The support seat is provided with an annular eccentric groove on the side facing the corresponding operating angle of the crankshaft, and a spring ring sheet is provided on the support seat, and the spring ring sheet extends into the annular eccentric groove, the fixed scroll plate is arranged in contact with the compression section of the spring ring sheet, and the movable scroll plate is located above the suspended part of the spring ring sheet, and the length of the suspended part of the spring ring sheet is used to balance the axial force exerted on the movable scroll plate within one rotation cycle.

According to an optional embodiment of the present invention, the fixed scroll is provided with an oil hole on the pressing section with the spring ring sheet, and when the movable scroll does not rotate to the angle where the oil hole is located, the spring ring sheet covers the oil hole, and at this time the oil hole is closed, and the oil outflow is restricted; when the movable scroll rotates to the angle where the oil hole is located, the spring ring sheet is deformed downward by the pressure of the movable scroll, and at this time the oil hole is connected, and the refrigeration oil flows out onto the surface of the spring ring sheet, and as the movable scroll moves in a circular motion on the surface of the spring ring sheet, the oil is scraped onto the entire moving contact surface, so as to achieve the effect of lubricating the bottom movement of the movable scroll.

According to an optional embodiment of the present invention, a coating is provided on the end surface of the spring ring sheet, and the coating is made of a high temperature resistant, corrosion resistant and self-lubricating material such as polytetrafluoroethylene and polyetheretherketone.

According to an optional embodiment of the present invention, a first positioning hole and a second positioning hole are provided on the support seat, and a first limiting hole and a second limiting hole are provided on the spring ring sheet. The first limiting hole and the second limiting hole are respectively arranged in alignment with the first positioning hole and the second positioning hole, and the first limiting hole and the second limiting hole are used to fix the spring ring sheet.

According to an optional embodiment of the present invention, the compressor housing further includes a drive motor, and a motor rotor of the drive motor is connected to the crankshaft to drive the crankshaft to rotate.

According to an optional embodiment of the present invention, a first balancing block and a second balancing block are respectively provided at two end positions of the crankshaft corresponding to the motor rotor of the drive motor, and a third balancing block is provided between the support seat and the crank of the crankshaft.

According to an optional embodiment of the present invention, a valve plate, a valve sheet and a filter are further provided on the movable scroll and the fixed scroll.

According to an optional embodiment of the present invention, an upper cover is further provided on the compressor housing, and the upper cover is provided with an exhaust pipe, and the exhaust pipe is connected with the valve plate, the valve sheet and the filter.

Compared with the prior art, the embodiment of the present invention provides a scroll compressor with an axially flexible structure, which has the following beneficial effects:

(1) Conventional technology does not consider the fluctuation problem within a rotation cycle in the axial force balance problem of the movable scroll. Usually, a certain method is designed to apply a constant axial force to the movable scroll, but it cannot solve the existing problem well. The present invention realizes the problem of precise adjustment of elastic force through the creative annular eccentric groove and spring ring plate structure, which is relatively low-cost and easy to process parts, and is conducive to improving the working efficiency of the compressor.

(2) Since the suspended length of the spring ring at the angle where the oil hole is located can be accurately controlled by the opening size of the eccentric groove of the support seat, the deformation of the spring ring can be accurately controlled from a design perspective. Therefore, the outflow of refrigeration oil is also controlled within an appropriate range, which can prevent the high friction caused by insufficient oil, the wear of parts and the reduction of compressor efficiency, or the excessive refrigeration oil causing the accumulation of more oil in the moving cavity and the resistance caused by the stirring between the moving parts affecting the working efficiency of the compressor.

(3) The present invention can also solve the problem of excessive pressure between the movable scroll and the fixed disk causing structural damage to the scroll wall under severe working conditions of the compressor. When the pressure exceeds the design allowable value, the axial force is too large, so that the movable scroll can move downward a greater distance. At this time, the deformation of the spring ring is larger, and an additional axial gap is generated inside the compression chamber to release the pressure, thereby avoiding the problem of structural damage caused by the gas pressure exceeding the upper limit that the scroll wall can withstand.

(4) Compared with the existing technology, the present invention has the characteristics of low cost and easy installation. Compared with the design of the traditional back pressure chamber, the present invention can better solve the difficulty of high cost and difficulty in sealing between cavities with different pressures due to the existence of cavities with different pressures inside the compressor, and avoid the decrease in compressor efficiency caused by internal leakage. Compared with the existing technical solutions, the present invention has a lower cost advantage. In addition, the method of balancing the gas force by arranging permanent magnets mentioned in patent CN117386616A may have the potential problem that the magnetism of the permanent magnet changes due to the large amount of heat generated during the operation of the compressor, thereby causing the magnetic force to deviate from the design value and causing the design failure. The technical solution of the present invention provides a better solution with lower material costs, more convenient assembly steps and more stable technical implementation solutions.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

FIG1 is a schematic structural diagram of a scroll compressor with an axially flexible structure provided in an embodiment of the present application.

FIG2 is a schematic diagram of a partially exploded structure of a scroll compressor with an axially flexible structure provided in an embodiment of the present application.

FIG3 is a front view of a support seat of a scroll compressor having an axially flexible structure provided in an embodiment of the present application.

FIG. 4 is a front view of a spring ring of a scroll compressor having an axially flexible structure provided in an embodiment of the present application.

5 is a partial cross-sectional view of a short suspension of a spring ring of a scroll compressor with an axially flexible structure provided in an embodiment of the present application.

6 is a partial cross-sectional view of a spring ring of a scroll compressor with an axially flexible structure provided in an embodiment of the present application, wherein the spring ring is suspended in the air.

FIG7 is a partial cross-sectional view of an oil hole opening of a scroll compressor with an axially flexible structure provided in an embodiment of the present application.

FIG. 8 is a partial enlarged schematic diagram of point A in FIG. 7 .

FIG9 is a partial cross-sectional view of an oil hole closing of a scroll compressor with an axially flexible structure provided in an embodiment of the present application.

FIG. 10 is a schematic diagram of the working principle of a scroll compressor with an axially flexible structure provided in an embodiment of the present application.

FIG. 11 is a schematic diagram of changes in the crankshaft and axial gas force of a scroll compressor with an axially flexible structure provided in an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

As shown in Figure 1, a schematic diagram of the structure of a scroll compressor with an axially flexible structure provided in an embodiment of the present application. A scroll compressor with an axially flexible structure includes a compressor housing 1, wherein a crankshaft 2 and a support seat 3 are arranged in the compressor housing 1, wherein the support seat 3 is connected to the upper part of the crankshaft 2 through a bearing 7, and a movable scroll 4 and a fixed scroll 5 are arranged on the support seat 3, wherein the movable scroll 4 is connected to the crank of the crankshaft 2 through a bearing 8, and the movable scroll 4 moves relative to the fixed scroll 5 to form a continuous change in the enclosed volume, thereby achieving the purpose of compressing the gas.

As shown in Figures 1, 2, 3, 4, 5, 6, 7, 8 and 9, an annular eccentric groove 34 is provided on the side of the support seat 3 facing the corresponding operating angle of the crankshaft 2, a spring ring sheet 6 is provided on the support seat 3, and the spring ring sheet 6 extends into the annular eccentric groove 34, the fixed scroll 5 is arranged in contact with the clamping section 63 of the spring ring sheet 6, and the movable scroll 4 is located above the suspended portion 64 of the spring ring sheet 6, and the length of the suspended portion of the spring ring sheet 6 is used to balance the axial force exerted on the movable scroll 4 during one rotation cycle.

The fixed scroll 5 is provided with an oil hole 51 on the pressing surface with the spring ring piece 6. When the movable scroll 4 does not rotate to the angle where the oil hole 51 is located, the spring ring piece 6 covers the oil hole 51. At this time, the oil hole 51 is closed, and the oil outflow 51 is restricted; when the movable scroll 4 rotates to the angle where the oil hole 51 is located, the spring ring piece 6 is deformed downward by the pressure of the movable scroll 4. At this time, the oil hole 51 is connected, and the refrigeration oil flows out from the gap 52 to the surface of the spring ring piece 6, and with the circular motion of the movable scroll 4 on the surface of the spring ring piece 6, the oil is scraped to the entire moving contact surface, so as to achieve the effect of lubricating the bottom movement of the movable scroll 4.

The end surface of the spring ring sheet is provided with a coating, which is made of a high temperature resistant, corrosion resistant and self-lubricating material such as polytetrafluoroethylene and polyetheretherketone. Specifically, in order to reduce the friction between the bottom of the movable scroll and the contact part of the spring ring sheet, increase the service life of the spring ring sheet, and improve the working efficiency of the scroll compressor, a surface treatment that facilitates lubrication can be performed on the end surface of the spring ring sheet that contacts the movable disk. Polytetrafluoroethylene, polyetheretherketone and other high temperature resistant, corrosion resistant and self-lubricating materials can be applied to the end surface of the spring ring sheet to form a coating to achieve the above effect.

The support seat 3 is provided with an outer edge pressing surface 31, a first positioning hole 32, a second positioning hole 33 and an annular eccentric groove 34. The pressing section of the spring ring piece 6 is arranged in contact with the outer edge pressing surface 31. The spring ring piece 6 is provided with a first limiting hole 61 and a second limiting hole 62, which are respectively arranged in alignment with the first positioning hole 32 and the second positioning hole 33, and the first limiting hole 61 and the second limiting hole 62 are used to fix the spring ring piece 6. In this embodiment, screws are used to fix the spring ring piece 6 on the limiting hole through the limiting hole.

The compressor housing 1 further includes a drive motor, which includes a motor stator 11 and a motor rotor 12 . The motor rotor 12 of the drive motor is connected to the crankshaft 2 to drive the crankshaft 2 to rotate.

A first balancing block 13 and a second balancing block 17 are respectively arranged at two sides of the crankshaft 2 corresponding to the motor rotor 12 of the driving motor, and a third balancing block 20 is arranged between the support seat 3 and the crank of the crankshaft 4 .

A valve plate 23, a valve sheet 24 and a filter screen 25 are also provided on the movable scroll 4 and the fixed scroll 5. An upper cover 26 is also provided on the compressor housing 1. The upper cover 26 is provided with an exhaust pipe 27, and the exhaust pipe 27 is connected to the valve plate 23, the valve sheet 24 and the filter screen 25. A sealing ring 21 and an O-ring 22 are also provided between the compressor housing 1 and the upper cover 26.

As shown in FIG1 , a sealing ring 9 and a retaining ring 10 are also provided between the crankshaft 2 and the support seat 3. The bottom of the crankshaft 2 is connected to the compressor housing 1 through a bearing 14, and the controller cover 18 is fixed to the side of the compressor housing 1 through screws 15. A plurality of terminals 16 are provided on the controller cover 18, and a sealing ring 19 is also provided between the top of the controller cover 18 and the side of the compressor housing 1.

As shown in Figures 5 to 9, when the axial force of the compressor is large, the movable scroll moves to a position where the spring ring has a shorter suspension amount. At this time, the spring ring deforms downward by the same vertical distance, generating a larger upward elastic force on the movable scroll. Figure 10 is a schematic diagram of the working principle of a scroll compressor with an axially flexible structure provided in an embodiment of the present application, and θ in Figure 10 is the angle of rotation of the movable scroll 4. Figure 11 is a schematic diagram of the change of the crankshaft and axial gas force of a scroll compressor with an axially flexible structure provided in an embodiment of the present application.

As described above, the present invention places a spring ring sheet between the support seat and the fixed scroll plate, and the support seat and the fixed plate press the outer edge of the spring ring sheet. An annular eccentric groove corresponding to the crankshaft angle is provided on the support seat. Due to the presence of the annular eccentric groove, the spring sheet has different compression section lengths and suspension section lengths on the cross section on the circumference, thereby generating precise elastic force corresponding to the crankshaft angle. The bottom of the movable scroll plate contacts the inner suspension section of the spring ring sheet, and the axial pressure of the movable scroll plate causes the spring sheet to deform, thereby controlling the precise opening and closing time and conduction gap of the oil hole of the fixed scroll plate during the rotation cycle, thereby accurately controlling the oil outflow and achieving a lubrication effect on the contact surface between the bottom of the movable plate and the spring sheet. The components of the present invention have the following characteristics:

An oil hole is opened at the contact surface between the fixed scroll and the suspended section of the spring ring. The oil hole is closed when the spring is not deformed, and the oil hole is open when the spring is bent downward. The outer circle of the bottom of the movable scroll is designed with a flange, which contacts the suspended section of the spring ring. Since the movable scroll slides with a certain eccentricity in the circumferential direction, the movable scroll bends a small part of the spring ring when it moves to a certain angle, while the other parts of the spring ring do not deform. The spring ring is made of elastic material. By controlling the thickness of the spring ring, the length of the suspended section of the spring ring, the deformation of the spring ring, and the elastic modulus of the material, the stress generated by the elastic deformation can be accurately calculated to accurately balance the different axial gas forces corresponding to different crankshaft angles. The surface of the spring ring is designed with a surface treatment process or coating that can lubricate the movement effect, such as Teflon coating, to reduce the friction with the bottom of the movable scroll, so as to improve the working efficiency and life of the compressor. The compression section length and the suspension section length of the spring sheet are precisely adjusted by opening grooves on the support seat, so as to precisely match different axial forces corresponding to different rotation angles in the compressor design.

In summary, although the present invention has been disclosed as above in terms of preferred embodiments, the above preferred embodiments are not intended to limit the present invention. A person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined in the claims.

Claims (8)

1. A scroll compressor with an axially flexible structure, characterized in that it comprises a compressor housing, a crankshaft and a support seat are arranged in the compressor housing, the support seat is connected to the upper part of the crankshaft through a bearing, a movable scroll and a fixed scroll are arranged on the support seat, the movable scroll is connected to the crank of the crankshaft, the movable scroll moves relative to the fixed scroll to form a continuous change of the closed volume, thereby achieving the purpose of compressing gas; The support seat is provided with an annular eccentric groove on the side facing the corresponding operating angle of the crankshaft, and a spring ring sheet is provided on the support seat, and the spring ring sheet extends into the annular eccentric groove, the fixed scroll plate is arranged in contact with the compression section of the spring ring sheet, and the movable scroll plate is located above the suspended part of the spring ring sheet, and the length of the suspended part of the spring ring sheet is used to balance the axial force exerted on the movable scroll plate within one rotation cycle. 2. A scroll compressor with an axially flexible structure according to claim 1, characterized in that the fixed scroll plate is provided with an oil hole on the pressing section with the spring ring plate, and when the movable scroll plate does not rotate to the angle where the oil hole is located, the spring ring plate covers the oil hole, and at this time the oil hole is closed, and the oil outflow is restricted; when the movable scroll plate rotates to the angle where the oil hole is located, the spring ring plate is deformed downward by the pressure of the movable scroll plate, and at this time the oil hole is connected, and the refrigeration oil flows out to the surface of the spring ring plate, and as the movable scroll plate moves in a circular motion on the surface of the spring ring plate, the oil is scraped to the entire moving contact surface, so as to achieve the effect of lubricating the bottom movement of the movable scroll plate. 3. A scroll compressor with an axially flexible structure according to claim 1, characterized in that a coating is provided on the end surface of the spring ring sheet, and the coating is made of a high-temperature, corrosion-resistant and self-lubricating material such as polytetrafluoroethylene and polyetheretherketone. 4. A scroll compressor with an axially flexible structure according to claim 1, characterized in that a first positioning hole and a second positioning hole are arranged on the support seat, and a first limiting hole and a second limiting hole are arranged on the spring ring sheet, the first limiting hole and the second limiting hole are respectively arranged to be aligned with the first positioning hole and the second positioning hole, and the first limiting hole and the second limiting hole are used to fix the spring ring sheet. 5. A scroll compressor with an axially flexible structure according to claim 1, characterized in that the compressor housing further comprises a drive motor, and a motor rotor of the drive motor is connected to the crankshaft to drive the crankshaft to rotate. 6. A scroll compressor with an axially flexible structure according to claim 5, characterized in that a first balancing block and a second balancing block are respectively arranged at the two end positions of the crankshaft corresponding to the motor rotor of the driving motor, and a third balancing block is arranged between the support seat and the crank of the crankshaft. 7. A scroll compressor with an axially flexible structure according to claim 1, characterized in that a valve plate, a valve sheet and a filter are further provided on the movable scroll and the fixed scroll. 8. A scroll compressor with an axially flexible structure according to claim 7, characterized in that an upper cover is also provided on the compressor housing, the upper cover is provided with an exhaust pipe, and the exhaust pipe is connected to the valve plate, the valve sheet and the filter.