Anti-rotation scroll plate for scroll air compressor and working method thereof

Abstract

This invention relates to an anti-rotation scroll plate for a scroll air compressor and its working method. The anti-rotation scroll plate includes a stationary scroll plate and a moving scroll plate. Multiple grooves are evenly distributed around the lower end face of the stationary scroll plate, with through holes at the bottom of the grooves. Electric push rod end caps are fixedly connected to the stationary scroll plate corresponding to each through hole. An electric push rod is installed inside each through hole, with its fixed end facing upwards and abutting against the inner bottom surface of the electric push rod end cap via a pressure sensor. Its driving end is fixedly connected downwards to a slider. An annular track is provided at the bottom of the slider. Multiple bosses that can be embedded in corresponding grooves are provided on the outer periphery of the moving scroll plate, with steel ball grooves on the bosses. A steel ball is provided between each boss and the slider, with the upper and lower parts of the steel ball embedded in the annular track and the steel ball groove, respectively. Under the pushing force of the electric push rod, the slider presses downwards against the steel ball. When the moving scroll plate moves, the steel ball rolls along the annular track, which can prevent the moving scroll plate from rotating while reducing wear and heat generation between the moving and stationary scroll plates.

Description

Technical Field

[0001] This invention relates to the field of air compressors for fuel cell vehicles, and more specifically to an anti-rotation scroll plate for a scroll air compressor and its working method. Background Technology

[0002] Scroll air compressors are widely used in the new energy vehicle industry. Existing scroll air compressors include a stationary scroll plate with helical scroll teeth, a moving scroll plate with helical scroll teeth that cooperates with the stationary scroll plate, and an anti-rotation mechanism that moves between the moving scroll plate and the upper support. The anti-rotation mechanism restricts the moving and stationary scroll plates so that they can only move relative to each other. The scroll teeth of the moving and stationary scroll plates mesh with each other to form multiple pairs of compression chambers. The eccentric main shaft driven by the motor drives the moving scroll plate to revolve along its orbit. The compression chambers move from the outside to the inside along the scroll teeth, and the volume gradually decreases, thereby achieving air compression.

[0003] During the operation of a scroll air compressor, an anti-rotation mechanism is generally provided to prevent the moving scroll from rotating on its own. Common anti-rotation mechanisms include pins and cross slip rings. Since the working process involves sliding friction, it often results in a large amount of heat generation and is prone to wear on the surfaces of the moving and stationary scrolls. Summary of the Invention

[0004] The purpose of this invention is to provide an anti-rotation scroll plate for a scroll air compressor and its working method. The anti-rotation scroll plate can prevent the moving scroll plate from rotating during the operation of the scroll air compressor and reduce the wear and heat generation of the moving scroll plate and the stationary scroll plate.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: an anti-rotation scroll disc for a scroll air compressor, comprising a stationary scroll disc and a moving scroll disc that cooperate with each other. The lower end face of the stationary scroll disc has multiple grooves evenly distributed around its periphery. A through hole penetrating the stationary scroll disc is formed at the bottom of each groove along the axial direction of the stationary scroll disc. An electric push rod end cap is fixedly connected to each through hole on the upper end face of the stationary scroll disc. An electric push rod is installed inside each through hole. The fixed end of the electric push rod abuts against the inner bottom surface of the electric push rod end cap via a pressure sensor. The driving end of the electric push rod is fixedly connected downwards to a slider. A ring track is formed at the lower part of the slider. The outer periphery of the moving scroll disc has multiple bosses that can be embedded in corresponding grooves. A steel ball groove is formed on each boss. A steel ball is provided between each boss and its corresponding slider. The upper and lower parts of the steel ball are embedded in the ring track and the steel ball groove, respectively. The slider presses against the steel ball downwards under the thrust of the electric push rod, and when the moving scroll disc moves, the steel ball rolls along the ring track.

[0006] Furthermore, the electric actuator includes an electric actuator housing, a motor, and a lead screw assembly. The motor is installed inside the electric actuator housing, and the motor's output axis is fixedly connected downwards to the lead screw of the lead screw assembly. The nut of the lead screw assembly is fixedly connected to the actuator sliding block. The actuator sliding block slides along the inner wall of the electric actuator housing and is fixedly connected to the upper part of the slider by connecting bolts and locking nuts. The electric actuator housing is pressed upwards against the inner bottom surface of the electric actuator end cap via a pressure sensor. A positioning structure is provided in the through hole to axially position the electric actuator housing.

[0007] Furthermore, the lower end face of the slider is higher than the lower end face of the stationary vortex disk to form a height difference between the two, thereby forming a boss embedding space; the cross-sectional shape and size of the groove of the stationary vortex disk are adapted to the boundary shape of the boss following the movement of the vortex disk.

[0008] Furthermore, the inner wall of the stationary vortex disk groove, the outer wall of the moving vortex disk boss, and the outer wall of the slider are all arc-shaped structures.

[0009] Furthermore, the annular track matches the trajectory of the steel ball with the orbital trajectory of the moving vortex disk.

[0010] Furthermore, the electric push rod drives the slider to move along the axial direction of the stationary scroll plate to position and apply force to the corresponding steel ball; the anti-rotation scroll plate is equipped with a control unit, which is electrically connected to each pressure sensor and the electric push rod. The control unit controls the electric push rod according to the force signal detected by the pressure sensor, and adjusts the thrust output of the electric push rod to avoid the steel ball being affected by excessive pressure, which affects rotation, or being unable to be positioned due to insufficient pressure, which would cause it to fall off.

[0011] Furthermore, the number of grooves on the stationary scroll plate and the number of bosses on the moving scroll plate are designed according to the structural size of the scroll plate used in the scroll air compressor.

[0012] The present invention also provides a method for operating the above-mentioned anti-rotation scroll disc for a scroll air compressor, comprising the following steps:

[0013] 1) The electric actuator controls the slider movement with a small initial thrust until the pressure sensor detects a pressure signal, that is, after the circular track contacts the steel ball, proceed to step 2);

[0014] 2) After adjusting the electric actuator to the ideal pressure value of the steel ball, proceed to step 3);

[0015] 3) The pressure sensor detects the force exerted by the steel ball on the circular track in real time. When the force is greater than the thrust of the electric push rod, the control unit controls the electric push rod to work and change the thrust of the electric push rod to the magnitude of the force, so as to avoid the steel ball from gapping with the vortex disk or even falling off during the operation, thus achieving precise positioning of the steel ball.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention converts the sliding friction between the moving and stationary scroll plates into rolling friction by using the rolling motion of the steel ball between the slider on the stationary scroll plate and the boss on the moving scroll plate, which is connected by an electric push rod. This prevents the moving scroll plate from rotating on its own while reducing wear and heat generation between the moving and stationary scroll plates caused by the anti-rotation structure design. At the same time, the present invention also achieves secondary anti-rotation through the cooperation between the boss on the moving scroll plate and the groove on the stationary scroll plate, so that a stable anti-rotation effect can still be achieved even if the anti-rotation of the rolling friction structure fails. In addition, the present invention uses the force signal detected by the pressure sensor to feedback the force status of the steel ball, and adjusts the thrust output of the electric push rod accordingly, thereby avoiding excessive pressure on the steel ball affecting its rotation or insufficient pressure causing it to fall off, thus ensuring the stability of the scroll air compressor during operation. Attached Figure Description

[0017] Figure 1 This is an isometric view of the anti-rotation vortex disk according to an embodiment of the present invention;

[0018] Figure 2 This is an isometric view of the moving vortex disk in an embodiment of the present invention;

[0019] Figure 3 This is a cross-sectional view of the anti-rotation vortex disk according to an embodiment of the present invention;

[0020] Figure 4 This is a simulation diagram of the torque control of the electric push rod motor in an embodiment of the present invention.

[0021] In the diagram: 1-Moving scroll plate, 2-Groove groove of stationary scroll plate, 3-Circular track, 4-Stationary scroll plate, 5-Electric push rod end cap, 6-Electric push rod, 7-Slider, 8-Boss of moving scroll plate, 9-Steel ball, 10-Locking nut, 11-Connecting bolt, 12-Screw pair, 13-Motor, 14-Electric push rod housing, 15-Pressure sensor, 16-Electric push rod control line. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0024] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0025] like Figure 1-3 As shown, this embodiment provides an anti-rotation scroll disc for a scroll air compressor, including a stationary scroll disc 4 and a moving scroll disc 1 that work together. The lower end face of the stationary scroll disc 4 has multiple grooves 2 evenly distributed around its periphery. The bottom of each groove 2 has a through hole extending through the stationary scroll disc along its axial direction. An electric push rod end cap 5 is fixedly connected to the upper end face of the stationary scroll disc 4 corresponding to each through hole. An electric push rod 6 is installed inside each through hole. The fixed end of the electric push rod 6 abuts against the inner bottom surface of the electric push rod end cap 5 via a pressure sensor 15. The drive end of the electric push rod 6 is fixedly connected downward to the slider 7. The slider 7 has an annular track 3 at the lower middle position. The outer periphery of the moving scroll plate 1 is provided with a plurality of protrusions 8 that can be embedded in corresponding grooves. A steel ball groove is provided at the middle position of the protrusion 8. Each protrusion 8 is equipped with a steel ball 9 between it and its corresponding slider 7. The upper and lower parts of the steel ball 9 are respectively embedded in the annular track 3 and the steel ball groove. The slider 7 presses against the steel ball 9 downward under the pushing force of the electric push rod 6. When the moving scroll plate 1 moves, the steel ball 9 rolls along the annular track 3.

[0026] In this embodiment, the electric actuator 6 includes an electric actuator housing 14, a motor 13, and a lead screw assembly 12. The motor 13 is installed inside the electric actuator housing 14. The output axis of the motor 13 is fixedly connected downwards to the lead screw of the lead screw assembly 12. The nut of the lead screw assembly 12 is fixedly connected to the actuator sliding block. The actuator sliding block slides along the inner wall of the electric actuator housing 14. The actuator sliding block is fixedly connected to the upper part of the slider 7 by connecting bolts 11 and locking nuts 10. The electric actuator housing 14 is pressed upwards against the inner bottom surface of the electric actuator end cap 5 by a pressure sensor 15. A positioning structure is provided in the through hole to axially position the electric actuator housing, thereby preventing the electric actuator from coming out of the lower end of the through hole when not under pressure. The positioning structure can be implemented in various ways. In this embodiment, the through hole is a stepped hole with a smaller diameter at the bottom and a larger diameter at the top. Correspondingly, the external structure of the electric push rod housing is also smaller at the bottom and larger at the top. Alternatively, the upper part of the outer side of the electric push rod housing may have a raised edge. When the electric push rod is inserted into the through hole from the top end, the stepped part of the through hole will hold the electric push rod in place, thereby achieving axial positioning of the electric push rod.

[0027] The annular track 3 matches the running trajectory of the steel ball 9 with the revolution trajectory of the moving scroll plate 1. Thus, when the moving scroll plate moves relative to the stationary scroll plate, the rolling motion of the steel ball realizes the rolling friction between the moving scroll plate and the stationary scroll plate. The steel ball also limits the movement of the slider and the boss, preventing the moving scroll plate from rotating.

[0028] The lower end face of the slider 7 is higher than the lower end face of the stationary scroll plate 4, creating a height difference between them and thus forming a boss embedding space. The cross-sectional shape and size of the groove 2 of the stationary scroll plate are adapted to the boundary shape of the boss 8 as it moves with the moving scroll plate. The inner sidewall of the groove 2 of the stationary scroll plate, the outer sidewall of the boss 8 of the moving scroll plate, and the outer sidewall of the slider 7 are all arc-shaped structures. Through the above structural design, the present invention achieves a two-stage anti-rotation effect through the cooperation between the boss 8 on the moving scroll plate 1 and the groove 2 on the stationary scroll plate 4. This ensures a stable anti-rotation effect even under complex actual conditions such as the failure of the anti-rotation structure due to rolling friction caused by processing, assembly, and wear during use in the scroll air compressor. At the same time, the arc-shaped structure design of the sidewalls of each component also avoids violent mechanical collisions between components, ensuring that there is a small sliding friction force when sliding friction occurs between components.

[0029] The electric actuator 6 drives the slider 7 to move axially along the stationary scroll plate to position and apply force to the corresponding steel ball 9. The anti-rotation scroll plate is equipped with a control unit, which is electrically connected to each pressure sensor and the electric actuator. The control unit controls the electric actuator based on the force signals detected by the pressure sensors, adjusting the output thrust of the electric actuator by changing the torque of the motor output shaft. This prevents the steel ball from being subjected to excessive pressure that affects rotation or insufficient pressure that prevents positioning and causes it to fall off. The simulation diagram of the torque control of the electric actuator motor in this embodiment is shown below. Figure 4 As shown.

[0030] In this embodiment, there are four grooves on the stationary scroll plate and four bosses on the moving scroll plate. In other embodiments, the number of grooves on the stationary scroll plate and the number of bosses on the moving scroll plate can be designed according to the structural size of the scroll plate used in the scroll air compressor.

[0031] In this embodiment, the implementation and operation process of the anti-rotation vortex disk are as follows:

[0032] Insert the electric actuator into the through hole of the stationary scroll plate, then connect the electric actuator to the slider. Next, place the pressure sensor on top of the electric actuator and secure it with the end cap to restrict axial movement. The control wires for the electric actuator and pressure sensor pass through pre-drilled holes in the end cap. After installing the moving scroll plate onto the eccentric spindle of the air compressor, install the moving scroll plate and stationary scroll plate according to their meshing scroll teeth. Finally, place the steel balls into the steel ball grooves on the moving scroll plate to complete the assembly of the anti-rotation scroll plate in the scroll air compressor.

[0033] To avoid excessive thrust impacting the steel ball, the electric actuator controls the slider movement with a small initial thrust until the pressure sensor detects a pressure signal, indicating that the annular track is in contact with the steel ball and exerting pressure. At this point, the electric actuator gradually increases the thrust to the ideal pressure value for the steel ball. During the operation of the moving scroll plate, the rolling motion of the steel ball between the slider (connected to the stationary scroll plate via the electric actuator) and the boss on the moving scroll plate converts the sliding friction between the moving and stationary scroll plates into rolling friction. This prevents the moving scroll plate from rotating while reducing wear and heat generation caused by the anti-rotation structure design. Furthermore, the engagement between the boss on the moving scroll plate and the groove on the stationary scroll plate provides a secondary anti-rotation mechanism, ensuring stable anti-rotation even if the rolling friction structure fails. During the operation of the rotating scroll plate, the pressure sensor detects the force exerted by the steel ball on the circular track in real time. When the force exceeds the thrust of the electric push rod, the control unit controls the electric push rod to change its thrust to the magnitude of the force, thus preventing the steel ball from gapping with the scroll plate or even falling off during operation and achieving precise positioning of the steel ball.

[0034] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. An anti-rotation scroll for a scroll air compressor comprising a stationary scroll and an orbiting scroll which work in cooperation with each other, characterized in that, The lower end face of the stationary vortex disk has multiple grooves evenly distributed around its periphery. A through hole is formed at the bottom of each groove along the axial direction of the stationary vortex disk, penetrating the disk. An electric push rod end cap is fixedly connected to each through hole on the upper end face of the stationary vortex disk. An electric push rod is installed inside each through hole. The fixed end of the electric push rod abuts against the inner bottom surface of the electric push rod end cap via a pressure sensor. The driving end of the electric push rod is fixedly connected to a slider. A ring track is formed at the lower part of the slider. The outer periphery of the moving vortex disk has multiple bosses that can be embedded in corresponding grooves. A steel ball groove is formed on each boss. A steel ball is provided between each boss and its corresponding slider. The upper and lower parts of the steel ball are embedded in the ring track and the steel ball groove, respectively. The slider presses against the steel ball downwards under the pushing force of the electric push rod, and when the moving vortex disk moves, the steel ball rolls along the ring track. The electric actuator includes an electric actuator housing, a motor, and a lead screw assembly. The motor is installed inside the electric actuator housing, and its output axis is fixedly connected downwards to the lead screw of the lead screw assembly. The nut of the lead screw assembly is fixedly connected to the actuator sliding block. The actuator sliding block slides along the inner wall of the electric actuator housing and is fixedly connected to the upper part of the slider by connecting bolts and locking nuts. The electric actuator housing abuts against the inner bottom surface of the electric actuator end cap via a pressure sensor. A positioning structure is provided in the through hole to axially position the electric actuator housing. The lower end face of the slider is higher than the lower end face of the stationary vortex disk to form a height difference between the two, thereby forming a boss embedding space; the cross-sectional shape and size of the groove of the stationary vortex disk are adapted to the boundary shape of the boss following the movement of the vortex disk. The inner wall of the groove of the stationary vortex disk, the outer wall of the boss of the moving vortex disk, and the outer wall of the slider are all arc-shaped structures. The electric push rod drives the slider to move along the axial direction of the stationary scroll plate to position and apply force to the corresponding steel ball. The anti-rotation scroll plate is equipped with a control unit, which is electrically connected to each pressure sensor and the electric push rod. The control unit controls the electric push rod according to the force signal detected by the pressure sensor, and adjusts the thrust output of the electric push rod to avoid the steel ball being affected by excessive pressure, which affects rotation, or being unable to be positioned due to insufficient pressure, which would cause it to fall off.

2. The anti-rotation scroll disc for a scroll air compressor according to claim 1, characterized in that, The circular track matches the trajectory of the steel ball with the orbital trajectory of the moving vortex disk.

3. The anti-rotation scroll disc for a scroll air compressor according to claim 1, characterized in that, The number of grooves on the stationary scroll and the number of protrusions on the moving scroll are designed according to the structural size of the scroll used in the scroll air compressor.

4. The working method of the anti-rotation scroll disc for a scroll air compressor according to claim 1, characterized in that, Includes the following steps: 1) The electric actuator controls the slider movement with a small initial thrust until the pressure sensor detects a pressure signal, i.e., after the circular track contacts the steel ball, proceed to step 2). 2) After adjusting the electric actuator to the ideal pressure value of the steel ball, proceed to step 3). 3) The pressure sensor detects the force exerted by the steel ball on the circular track in real time. When the force is greater than the thrust of the electric push rod, the control unit controls the electric push rod to work and changes the thrust of the electric push rod to the magnitude of the force, so as to avoid the steel ball from gapping with the vortex disk or even falling off during the operation, thus achieving precise positioning of the steel ball.

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