An energy-saving multi-stage screw air compressor

Abstract

The present invention provides an energy-saving multi-stage screw air compressor, comprising a housing, a screw, a drive motor and a planetary gear mechanism. The compressor realizes progressive starting of the screw through a first drive mechanism and a second drive mechanism connected by the planetary gear mechanism. In the initial startup, the first drive mechanism with low speed and high torque drives the screw to overcome the inertial load, and then the second drive mechanism with high speed intervenes to accelerate the screw to maximum working efficiency. At the same time, the reset mechanism ensures that the first drive mechanism returns to its original position after separation, and the switching mechanism realizes smooth switching of the drive mechanism. The present invention can effectively improve the service life of the motor, enhance the stability and reliability of the compressor, reduce maintenance costs, and prevent gas backflow and protect the motor through the disconnection design, which has significant energy-saving effects and practical value.

Description

Technical Field

[0001] The present invention relates to the technical field of energy-saving air compressors, in particular to an energy-saving multi-stage screw air compressor. Background Art

[0002] Multi-stage screw air compressors are efficient and reliable air compression equipment that gradually compress air to the required pressure through a multi-stage compression process. They are widely used in industries such as industry, manufacturing, aerospace, and medicine. Motor startup is a crucial step in the operation of a multi-stage screw air compressor, directly impacting the compressor's startup speed, energy efficiency, and overall performance.

[0003] However, existing multi-stage screw air compressors often have numerous shortcomings when starting with a motor. Specifically, at the moment of startup, the high inertial load and static friction of the screw often require the motor to provide a very high starting torque. This not only places a huge load on the motor, shortening its service life, but also results in high energy consumption during startup, resulting in a lack of energy savings.

[0004] To this end, the present invention proposes an energy-saving multi-stage screw air compressor. Summary of the Invention

[0005] The object of the present invention is to provide an energy-saving multi-stage screw air compressor to solve the above-mentioned deficiencies in the prior art.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: an energy-saving multi-stage screw air compressor, comprising a housing, a screw mounted in the housing, and a drive motor disposed on the housing, wherein a planetary gear mechanism connected to the drive motor is disposed in the housing, and the energy-saving multi-stage screw air compressor further comprises:

[0007] a first drive mechanism and a second drive mechanism provided on the planetary gear mechanism, wherein the planetary gear mechanism is configured to make the rotation speed of the first drive mechanism lower than the rotation speed of the second drive mechanism;

[0008] A first claw and a ratchet groove are provided on the shaft end of the screw. When the drive motor is started, the first drive mechanism pushes the first claw to realize the rotation of the screw. When the screw has an initial velocity, the second drive mechanism engages with the ratchet groove to accelerate the screw and simultaneously separate the first drive mechanism from the screw.

[0009] The reset mechanism is arranged on the planetary gear mechanism. After the first drive mechanism is separated from the screw, the reset mechanism is used to limit the position of the first drive mechanism, and when the drive motor stops running, the reset mechanism is also used to restore the first drive mechanism to its initial position.

[0010] As a further description of the above technical solution: the planetary gear mechanism includes an outer ring gear arranged on the housing, planetary gears, a planetary carrier and a sun gear, wherein the planetary gears are arranged between the outer ring gear and the sun gear and are engaged with the outer ring gear and the sun gear at the same time, and the planetary carrier is installed on the planetary gears, the first drive mechanism is installed on the planetary carrier, and the second drive mechanism is installed on the sun gear.

[0011] As a further description of the above technical solution: the first driving mechanism includes a sliding seat slidingly set on the planetary carrier through spring 2, and a driving plate and a wedge block set on the sliding seat. When the planetary carrier rotates, the driving plate abuts against the surface of the claw 1.

[0012] As a further description of the above technical solution: the second driving mechanism includes multiple groups of claws 2 arranged in a circular array on the sun gear shaft, and the claws 2 are connected to the raised position of the sun gear shaft through springs 5. During the process of starting the drive motor to reaching the maximum speed, the claws 2 expand outward under the action of centrifugal force and resist the surface of the ratchet groove.

[0013] As a further description of the above technical solution: when the second claw abuts against the surface of the ratchet groove and makes the rotation speed of the first claw greater than the rotation speed of the push plate, the first claw abuts against the inclined surface of the wedge block on the adjacent sliding seat to achieve the separation of the first drive mechanism and the first claw.

[0014] As a further description of the above technical solution: a plug-in column is provided on the sliding seat through spring four, and a hole that is compatible with the plug-in column is opened on the planetary frame. When the claw one contacts the inclined surface of the wedge block, the sliding seat slides along the planetary frame and the plug-in column is inserted into the hole to realize the positioning action of the sliding seat.

[0015] As a further description of the above technical solution: the reset mechanism includes multiple annular pressure plates installed on the sun gear shaft through springs, and the annular pressure plates are attached to the surface of the planetary carrier hole position, and a movable column is slidably arranged in the hole, and the length of the movable column is greater than the depth of the hole.

[0016] As a further description of the above technical solution: the plurality of annular pressure plates are distributed in a circular array, and the size of the end gap between two adjacent annular pressure plates is smaller than the diameter of the movable column.

[0017] As a further description of the above technical solution: the energy-saving multi-stage screw air compressor also includes a switching mechanism arranged on the shell, and a contact plate is provided on each of the plurality of sliding seats through a connecting rod. When the sliding seat slides along the planetary carrier, the contact plate interferes with the switching mechanism to release the lock on the outer ring gear and lock the planetary carrier at the same time.

[0018] As a further description of the above technical solution: the contact plate is arc-shaped, and the curvature of the contact plate is greater than the curvature of the circle whose radius is the distance from the center position of the front view of the multiple contact plates to the contact plate. When the switching mechanism is pushed to the maximum stroke by the sliding seat and the connecting rod, the front view trajectory of the multiple contact plates is a perfect circle, and the gap size between two adjacent contact plates is smaller than the width of the push block.

[0019] In the above technical solution, the energy-saving multi-stage screw air compressor provided by the present invention has the following beneficial effects:

[0020] 1. The present invention adopts a first drive mechanism and a second drive mechanism to progressively start the screw. At the initial stage of starting, the first drive mechanism with a lower speed but a larger torque drives the screw to rotate, effectively overcoming the high inertia load and static friction of the screw and avoiding motor overload. When the screw obtains a certain initial speed, the second drive mechanism intervenes to accelerate the screw at a higher speed to achieve maximum working efficiency. This starting method not only protects the motor, but also improves the overall energy efficiency and effectively reduces the current impact when the motor starts. This not only reduces the energy consumption of the motor, but also extends the service life of the motor, which is in line with the design concept of energy-saving motors.

[0021] 2. A reset mechanism is provided to limit the position of the first drive mechanism after it separates from the screw, preventing it from falling back and affecting the drive of the second drive mechanism. At the same time, when the motor stops running, the reset mechanism automatically restores the first drive mechanism to its initial position without manual intervention, improving ease of use. The switching mechanism also automatically releases the outer ring gear and locks the planetary carrier when switching between the first and second drive mechanisms, improving overall stability and reliability.

[0022] 3. After the motor is turned off, the first drive mechanism and the second drive mechanism are disconnected from the screw to prevent the residual high-pressure gas in the housing from flowing back and pushing the rotor to reverse, causing the drive motor to be forced to be driven in the reverse direction, thereby further protecting the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0024] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention;

[0025] Figure 2 A schematic structural diagram of an overall cross-sectional view provided for an embodiment of the present invention;

[0026] Figure 3 A schematic diagram of the structure of a rear view provided by an embodiment of the present invention;

[0027] Figure 4 A schematic structural diagram of a planetary gear mechanism and a switching mechanism provided in an embodiment of the present invention;

[0028] Figure 5 A schematic structural diagram of a first driving mechanism provided in an embodiment of the present invention;

[0029] Figure 6 A schematic structural diagram of a front view of a first driving mechanism and a screw shaft provided in an embodiment of the present invention;

[0030] Figure 7 A schematic structural diagram of a screw provided in an embodiment of the present invention;

[0031] Figure 8 A schematic structural diagram of the sun gear and the second drive mechanism provided in an embodiment of the present invention;

[0032] Figure 9 A schematic structural diagram of a push plate and an outer gear ring provided in an embodiment of the present invention;

[0033] Figure 10 This is an exploded view of the reset mechanism provided by an embodiment of the present invention.

[0034] Description of reference numerals:

[0035] 1. Housing; 2. Drive motor; 3. Push block; 31. Contact plate; 32. Connecting rod; 33. Rotating rod; 34. Bump; 35. Planetary constellation; 36. Spring 1; 37. Clamping block; 4. Screw; 5. Spring 2; 51. Spring 3; 52. Spring 4; 53. Connecting column; 54. Movable column; 55. Annular pressure plate; 6. Sliding seat; 61. Wedge block; 62. Roller; 63. Drive plate; 64. Claw 1; 7. Ratchet groove; 71. Claw 2; 72. Spring 5; 8. Planetary gear; 9. Planet carrier; 10. Sun gear; 11. Outer ring gear. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0037] See also Figures 1-10The embodiment of the present invention provides a technical solution: an energy-saving multi-stage screw 4 air compressor, comprising a housing 1, a screw 4 installed in the housing 1, and a drive motor 2 provided on the housing 1. A planetary gear 8 mechanism connected to the drive motor 2 is provided in the housing 1. After the drive motor 2 is started, the planetary gear 8 mechanism starts to operate, so that the first drive mechanism and the second drive mechanism provided on the planetary gear 8 mechanism can drive the screw 4;

[0038] It should be noted here that the planetary gear 8 mechanism includes an outer ring gear 11 provided on the housing 1, planetary gears 8, a planetary carrier 9 and a sun gear 10, wherein the planetary gear 8 is provided between the outer ring gear 11 and the sun gear 10 and meshes with the outer ring gear 11 and the sun gear 10 at the same time, the planetary carrier 9 is installed on the planetary gear 8, and the power end of the drive motor 2 is connected to the sun gear 10. Due to the characteristics of the planetary gear 8 mechanism, when the sun gear 10 is in a rotating state, the planetary gear 8 will not only rotate on its own, but also revolve around the sun gear 10, thereby driving the planetary carrier 9 to revolve around the sun gear 10, but the speed of the revolution is lower than the speed of the sun gear 10. Here, the first drive mechanism is installed on the planetary carrier 9, and the second drive mechanism is installed on the sun gear 10, so that the speed of the first drive mechanism is lower than the speed of the second drive mechanism through the planetary gear 8 mechanism;

[0039] When the screw 4 is started by the drive motor 2, since the energy-saving multi-stage screw 4 air compressor is provided with a claw 64 and a ratchet groove 7 at the shaft end of the screw 4, when the drive motor 2 is started, the first drive mechanism pushes the claw 64 to realize the rotation of the screw 4. Here, the first drive mechanism on the planetary carrier 9 pushes the claw 64 to drive the screw 4 to rotate. It is a lower speed compared with the speed of the sun gear 10 directly connected to the drive motor 2, and it can be seen from the structural characteristics of the planetary gear 8 group that the speed is slow at this time, but the torque is large. Therefore, when the screw 4 is in a stationary state and enters a rotating state, it is driven by the first drive mechanism on the planetary carrier 9 with a larger torque to overcome its own high inertia load and static friction, and avoid motor overload. After the screw 4 has a certain initial velocity, the second drive mechanism docks with the ratchet groove 7 to accelerate the screw 4 At the same time as the speed is increased, the first drive mechanism is separated from the screw 4. At this time, the screw 4 can be taken over by the second drive mechanism connected to the sun gear 10, so that the speed of the screw 4 is increased from a lower speed to the motor speed, thereby achieving the maximum working efficiency of the screw 4 air compressor. When the screw 4 in the air compressor is started by the motor, the screw 4 can be started with a low speed and high torque in the initial stage of startup. After the screw 4 has a certain initial speed after startup, the driving source is switched to the second drive mechanism with a higher speed, thereby making the air compressor reach the maximum working efficiency; when the air compressor screw 4 is started by the drive motor 2, this progressive starting method is adopted. At the time of startup, the high torque output characteristics of the planetary carrier 9 are used to overcome the inertia load, and the sun gear drive is switched to during steady-state operation to achieve efficient transmission, thereby improving the service life of the drive motor 2;

[0040] The energy-saving multi-stage screw 4 air compressor is also provided with a reset mechanism, which is arranged on the planetary gear 8 mechanism. After the first drive mechanism is separated from the screw 4, the reset mechanism is used to limit the position of the first drive mechanism, thereby preventing the first drive mechanism from falling back and affecting the drive of the second drive mechanism when the second drive mechanism drives the screw 4. When the drive motor 2 stops running, the reset mechanism is also used to restore the first drive mechanism to its initial position. In the initial stage of starting the drive motor 2 next time, the screw 4 is still driven by the first drive mechanism with high torque, without manual adjustment, and is more convenient to use.

[0041] In one embodiment of the present invention, the first drive mechanism includes a sliding seat 6 slidably mounted on the planetary carrier 9 via a second spring 5, and a drive plate 63 and a wedge block 61 mounted on the sliding seat 6. When the planetary carrier 9 rotates, the drive plate 63 abuts against the surface of the first claw 64, and the drive motor 2 is activated, causing the planetary carrier 9 to rotate, driving the sliding seat 6, the drive plate 63, and the wedge block 61 to rotate. The screw 4 is then driven to rotate by the abutting first claw 64 and the drive plate 63.

[0042] In another embodiment of the present invention, the second driving mechanism includes a plurality of groups of second claws 71 arranged in a circumferential array on the rotating shaft of the sun gear 10, and the second claws 71 are connected to the raised position of the rotating shaft of the sun gear 10 through the fifth spring 72. When the drive motor 2 is started and reaches the maximum speed, the second claws 71 are expanded outward under the action of centrifugal force and abut against the surface of the ratchet groove 7. After a period of time after the drive motor 2 is started, especially when the drive motor 2 has a certain load, in order to protect the drive motor 2, the current is often changed to make the rotor of the drive motor 2 have a certain acceleration time, that is, at one end after the drive motor 2 is started, After a certain time, its rotor will reach the maximum speed, thereby making the sun gear 10 reach the maximum rotation speed, and the second claw 71 is connected to the raised position of the sun gear 10 rotation shaft through the fifth spring 72, and multiple second claws 71 are rotatably arranged on the sun gear 10 rotation shaft in a circular array. After the sun gear 10 reaches the maximum rotation speed, the centrifugal force overcomes the elastic force of the fifth spring 72, and the fifth spring 72 stretches and deforms, and multiple second claws 71 expand outward and abut against the surface of the ratchet groove 7. At this time, the connection between the second drive mechanism and the screw 4 is completed, so that the screw 4 begins to accelerate to the maximum speed, thereby achieving the maximum working efficiency of the screw 4 air compressor;

[0043] It should be noted that when the second claw 71 contacts the surface of the ratchet groove 7 and the rotation speed of the claw 1 64 is greater than the rotation speed of the push plate, the claw 1 64 contacts the inclined surface of the wedge block 61 on the adjacent sliding seat 6, thereby realizing the separation of the first driving mechanism and the claw 1 64, that is, when the second driving mechanism intervenes to drive the screw 4 to rotate, the rotation speed of the screw 4 is greater than the sliding seat 6, the wedge block 61 and the driving plate 63. At this time, the screw 4 and the sliding seat 6, the wedge block 61 and the driving plate 63 are no longer in a relatively static state, but have generated relative movement. After the relative movement occurs, the claw 1 64 on the screw 4 will contact the inclined surface of the wedge block 61, causing the wedge block 61, the driving plate 63 and the sliding seat 6 to move along the planetary carrier. 9 moves, so that the wedge block 61, the driving plate 63 and the sliding and clamping claw 1 64 are separated. At this time, the first driving mechanism is separated from the screw rod 4. In order to minimize the influence of the first driving mechanism on the rotation of the screw rod 4 after separation, the sliding seat 6 is provided with a roller 62 at the position between the wedge block 61 and the driving plate 63. In this way, when the clamping claw 1 64 contacts the wedge block 61 to move the sliding seat 6, it will also push the roller 62 to further move the sliding seat 6. In this way, in the subsequent rotation of the screw rod 4, the clamping claw 1 64 thereon will only contact the roller 62. The roller 62 replaces the sliding friction with the rolling friction, thereby reducing the friction and thus improving the service life.

[0044] After the sliding seat 6, wedge block 61 and driving plate 63 on the first driving mechanism are separated from the claw 1 64 on the screw rod 4, a reset mechanism is provided to prevent the first driving mechanism from falling back. The reset mechanism includes a plug-in column 53 provided on the sliding seat 6 by a spring 4 52, and a hole is provided on the planetary carrier 9 that is adapted to the plug-in column 53. When the claw 1 64 contacts the inclined surface of the wedge block 61, the sliding seat 6 slides along the planetary carrier 9 and the plug-in column 53 is plugged into the hole to realize the positioning action of the sliding seat 6. When the sliding seat 6 moves on the planetary carrier 9, the plug-in column 53 is plugged into the hole to lock the sliding seat 6, thereby preventing the sliding seat 6 from falling back and causing movement restriction.

[0045] In order to ensure that the first drive mechanism can automatically return to its original position after the drive motor 2 is turned off, in another embodiment of the present invention, the reset mechanism includes a plurality of annular pressure plates 55 installed on the rotating shaft of the sun gear 10 through spring three 51, and the annular pressure plates 55 are fitted on the surface of the hole position of the planetary carrier 9, and a movable column 54 is slidingly provided in the hole, and the length of the movable column 54 is greater than the depth of the hole. What needs to be explained in detail here is that when the second drive mechanism intervenes, that is, after the claw two 71 is against the ratchet groove 7, the centrifugal force at this time will also cause the spring three 51 to stretch and deform, and the plurality of annular pressure plates 55 will expand outward, and when the plug-in column 53 is plugged into the hole, since the length of the movable column 54 is greater than the depth of the hole, one end of the movable column 54 will be at the end of the plug-in column 53 in the hole. After the annular pressure plate 55 is restored to its original position, the annular pressure plate 55 squeezes the movable column 54, causing the movable column 54 to move toward the position of the plug-in column 53, thereby ejecting the plug-in column 53 from the hole. At this time, the spring 2 5 recovers its deformation, ejecting the sliding seat 6, and the sliding seat 6 returns to its original position, thereby restoring the first drive assembly composed of the driving plate 63, the wedge block 61 and the sliding seat 6. In the initial stage of starting the driving motor 2 next time, the planetary carrier 9 with larger torque is used first, and then the second driving mechanism takes over the driving screw 4. No manual adjustment is required, and the overall use is more convenient.

[0046] After the driving motor 2 is turned off, due to the reduction of centrifugal force, the second claw 71 gradually disengages from the ratchet groove 7, the annular pressure plate 55 also gradually returns to its initial position and squeezes the plug post 53 out through the movable column 54. At this time, the sliding seat 6 falls back, but due to the effect of inertia, the speed of the screw 4 is still greater than that of the sliding seat 6, the driving plate 63 and the wedge block 61. In this way, the first claw 64 on the screw 4 will continue to push the sliding seat 6 through the wedge block 61. However, since the annular pressure plate 55 is attached to the outside of the hole to form a block, the movable column 54 cannot enter the hole completely, so that the end of the movable column 54 exposed from the hole limits the plug post 53 on the sliding seat 6. The sliding seat 6 cannot reach the height when it can be fixed by the hole and can only move back and forth continuously. At this time, the pulley and the wedge block 61 can decelerate the screw 4, causing the screw 4 to quickly decelerate to 0.

[0047] Furthermore, during this process, neither the first drive mechanism nor the second drive mechanism is connected to the screw 4. That is, after the drive motor 2 is turned off, the first drive mechanism and the second drive mechanism are disconnected from the screw 4, thereby preventing the residual high-pressure gas in the housing 1 from flowing back and pushing the rotor to reverse, causing the drive motor 2 to be forced to reversely drive. This can further protect the drive motor 2 and further increase its service life.

[0048] It should also be noted that when the screw 4 is driven by the second drive mechanism, the width of the clamping claw 64 is set to completely pass over the wedge block 61, the roller 62 and the driving plate 63. In other words, the width of the top of the clamping claw 64 is greater than the gap between the driving plate 63, the roller 62 and the wedge block 61.

[0049] It should also be noted that the multiple annular pressure plates 55 are distributed in a circular array, and the size of the end gap between two adjacent annular pressure plates 55 is smaller than the diameter of the movable column 54. The purpose of this arrangement is that since the multiple annular pressure plates 55 are all arranged on the sun gear 10, that is, the multiple annular pressure plates 55 are all rotating continuously, when the drive motor 2 stops, the positions of the multiple annular pressure plates 55 are uncertain. In this way, only when the gap between adjacent annular pressure plates 55 is smaller than the diameter of the movable column 54 can it be ensured that the movable column 54 can be pushed to push the plug-in column 53 out of the hole, thereby preventing the movable column 54 from being stuck in the gap between the multiple annular pressure plates 55 and causing the movable column 54 to be unable to be pushed.

[0050] Furthermore, both ends of the movable column 54 are arc-shaped so that the annular pressure plate 55 can push the movable column 54 and prevent it from getting stuck.

[0051] When the first drive mechanism and the second drive mechanism are switched, and when the sliding seat 6 slides along the planetary carrier 9, the energy-saving multi-stage screw 4 air compressor further includes a switching mechanism provided on the housing 1, and a plurality of sliding seats 6 are provided with a contact plate 31 through a connecting rod 32. When the sliding seat 6 slides along the planetary carrier 9, the planetary carrier 9 is locked while the outer ring gear 11 is unlocked through the contact plate 31. Due to the characteristics of the planetary gear 8 mechanism, when the planetary carrier 9 is locked, the outer ring gear 11 will rotate. At this time, by unlocking the outer ring gear 11 and locking the planetary carrier 9 at the same time, the planetary carrier 9 no longer rotates, that is, when the second drive mechanism drives the screw 4, the planetary carrier 9 and the first drive mechanism thereon stop rotating to prevent local vibration. Instead, the outer ring gear 11 on the outside is rotated to improve overall stability.

[0052] In another embodiment of the present invention, the switching mechanism includes a push block 3 mounted on the housing 1 by a spring 36, and a rotating rod 33 arranged on the housing 1 by a torsion spring. A planetary constellation 35 is provided on the surface of the planetary gear 8 away from the planetary carrier 9, and a clamping block 37 is provided on the outer ring gear 11. A protrusion 34 is provided on the planetary constellation 35. When the sliding seat 6 moves away from the screw 4, that is, when the first driving mechanism is separated from the screw 4, the contact plate 31 is moved at the same time by the connecting rod 32. The contact plate 31 pushes the push block 3 away from the clamping block 37. At this time, the lock of the outer ring gear 11 is released. At the same time, the moving push block 3 squeezes the rotating rod. 33. After the rotation of the rotating rod 33, one end approaches the planetary constellation 35. When the planetary constellation 35 revolves with the planetary gear 8, the protrusion 34 abuts against the end of the rotating rod 33. At this time, the planetary constellation 35 is fixed and cannot revolve. When the second driving mechanism drives the screw 4, the planetary carrier 9 and the first driving mechanism thereon stop rotating to prevent local vibration. Instead, the outer ring gear 11 on the outside rotates to improve the overall stability. Conversely, when the driving motor 2 is turned off and the sliding seat 6 returns to its original position, the push block 3 and the rotating rod 33 also return to their original positions, thereby re-locking the outer ring gear 11 and unlocking the planetary constellation 35 and the planetary carrier 9 to facilitate the next use.

[0053] Please note that Figure 9When the sliding seat 6 and the connecting rod 32 push the switching mechanism to move to the maximum stroke, the front view trajectory of the multiple contact plates 31 is a perfect circle. When the sliding seat 6 moves away from the screw rod 4, the contact plates 31 are pushed to move by the connecting rod 32. After the contact plates 31 move, the rotation trajectory of the multiple contact plates 31 is a perfect circle, so that when rotating, each position has the same force on the push block 3, preventing the push block 3 from being unevenly subjected to force, and the gap size between the adjacent two contact plates 31 is smaller than the width of the push block 3. In this way, when the planetary carrier 9 stops rotating, at least one contact plate 31 can always be kept in contact with the push block 3, preventing the push block 3 from rebounding through the gap between the multiple contact plates 31.

[0054] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. An energy-saving multi-stage screw (4) air compressor, comprising a housing (1), a screw (4) mounted in the housing (1), and a drive motor (2) disposed on the housing (1), wherein a planetary gear (8) mechanism connected to the drive motor (2) is disposed in the housing (1), characterized in that: Also includes: A first drive mechanism and a second drive mechanism are provided on a planetary gear (8) mechanism, wherein the planetary gear (8) mechanism is used to make the rotation speed of the first drive mechanism lower than the rotation speed of the second drive mechanism; A claw (64) and a ratchet groove (7) are provided on the shaft end of the screw (4); when the drive motor (2) is started, the first drive mechanism pushes the claw (64) to realize the rotation of the screw (4); and after the screw (4) has an initial velocity, the second drive mechanism docks with the ratchet groove (7) to accelerate the screw (4) and simultaneously separate the first drive mechanism from the screw (4); a reset mechanism, provided on the planetary gear (8) mechanism, for limiting the position of the first drive mechanism after the first drive mechanism is separated from the screw (4), and for restoring the first drive mechanism to an initial position when the drive motor (2) stops running; The planetary gear (8) mechanism comprises an outer ring gear (11) arranged on the housing (1), planetary gears (8), a planetary carrier (9) and a sun gear (10), wherein the planetary gear (8) is arranged between the outer ring gear (11) and the sun gear (10) and meshes with the outer ring gear (11) and the sun gear (10), the planetary carrier (9) is mounted on the planetary gear (8), the first driving mechanism is mounted on the planetary carrier (9), the second driving mechanism is mounted on the sun gear (10), and the power end of the driving motor (2) is connected to the sun gear (10); The first driving mechanism comprises a sliding seat (6) slidingly arranged on the planetary carrier (9) via a second spring (5), and a driving plate (63) and a wedge block (61) arranged on the sliding seat (6). When the planetary carrier (9) rotates, the driving plate (63) abuts against the surface of the first claw (64).

2. An energy-saving multi-stage screw (4) air compressor according to claim 1, characterized in that: The second driving mechanism comprises a plurality of groups of second claws (71) arranged in a circumferential array on the rotating shaft of the sun gear (10), and the second claws (71) are connected to the raised position of the rotating shaft of the sun gear (10) via the fifth spring (72). When the driving motor (2) is started and reaches the maximum speed, the second claws (71) are expanded outwards under the action of centrifugal force and abut against the surface of the ratchet groove (7).

3. An energy-saving multi-stage screw (4) air compressor according to claim 2, characterized in that: When the second clamping claw (71) contacts the surface of the ratchet groove (7) and the rotation speed of the first clamping claw (64) is greater than the rotation speed of the push plate, the first clamping claw (64) contacts the inclined surface of the wedge block (61) on the adjacent sliding seat (6), thereby separating the first driving mechanism and the first clamping claw (64).

4. An energy-saving multi-stage screw (4) air compressor according to claim 3, characterized in that: The sliding seat (6) is provided with a plug-in column (53) via a spring four (52), and the planetary frame (9) is provided with a hole adapted to the plug-in column (53). When the clamping claw one (64) contacts the inclined surface of the wedge block (61), the sliding seat (6) slides along the planetary frame (9) and enables the plug-in column (53) to be plugged into the hole to realize the positioning action of the sliding seat (6).

5. An energy-saving multi-stage screw (4) air compressor according to claim 4, characterized in that: The reset mechanism includes a plurality of annular pressure plates (55) mounted on the rotating shaft of the sun gear (10) via spring three (51), and the annular pressure plates (55) are fitted on the surface of the hole position of the planetary carrier (9), and a movable column (54) is slidably arranged in the hole, and the length of the movable column (54) is greater than the depth of the hole.

6. An energy-saving multi-stage screw (4) air compressor according to claim 5, characterized in that: The plurality of annular pressure plates (55) are distributed in a circumferential array, and the size of the gap between the ends of two adjacent annular pressure plates (55) is smaller than the diameter of the movable column (54).

7. An energy-saving multi-stage screw (4) air compressor according to claim 6, characterized in that: The energy-saving multi-stage screw (4) air compressor further comprises a switching mechanism provided on the housing (1), wherein a plurality of the sliding seats (6) are provided with a contact plate (31) via a connecting rod (32), and when the sliding seat (6) slides along the planetary carrier (9), the contact plate (31) contacts the switching mechanism, thereby releasing the locking of the outer ring gear (11) and locking the planetary carrier (9) at the same time.

8. An energy-saving multi-stage screw (4) air compressor according to claim 7, characterized in that: The contact plate (31) is arc-shaped, and the curvature of the contact plate (31) is greater than the curvature of a circle whose radius is the distance from the center position of the front view of the plurality of contact plates (31) to the contact plate (31); when the switching mechanism is pushed to move to the maximum stroke by the sliding seat (6) and the connecting rod (32), the front view trajectory of the plurality of contact plates (31) is a perfect circle, and the gap size between two adjacent contact plates (31) is smaller than the width of the push block (3).

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