Vacuum pump structure of air compressor

Abstract

The invention relates to the technical field of vacuum pump design, and discloses an air compressor vacuum pump structure which comprises a first mounting shell, a second mounting shell, a cylinder body, a top cover and a double-shaft motor, eccentric blocks and connecting rods are arranged in the first mounting shell and the second mounting shell, piston discs are arranged at the upper ends of the connecting rods, and cooling fans are arranged in the first mounting shell and the second mounting shell. Wrapping covers are arranged on the first mounting shell and the second mounting shell, connecting ends are arranged at the ends of output shafts of the double-shaft motors, connecting rings are arranged on the inner walls of the peripheral sides of the wrapping covers, three connecting plates which are evenly distributed along the peripheral sides of the connecting rings at intervals are arranged in the connecting rings, and sliding plates are slidably connected to the connecting plates; a connecting arm extending towards one side of the connecting end is arranged at one end of the sliding plate, brake blocks used for abutting against the outer wall of the connecting end are arranged at the end, away from the sliding plate, of the connecting arm, and a driving assembly used for driving the three brake blocks to abut against the outer wall of the connecting end after the double-shaft motor is powered off is arranged in the wrapping cover.

Description

Technical Field

[0001] The invention belongs to the technical field of vacuum pump design, and in particular relates to a vacuum pump structure of an air compressor. Background Art

[0002] The components of an air compressor include a vacuum pump, an air storage tank, a cooler, an oil filter, and a control system. The basic principle of an oil-free vacuum pump is to press the connecting rod and the eccentric wheel together. The eccentric wheel is tightly locked on the motor shaft. The rotation of the shaft drives the connecting rod to reciprocate, thereby realizing the process of air intake, compression, and discharge. The entire vacuum pump is small in size, light in weight, beautiful in appearance, and simple in structure. It is completely oil-free and easy to maintain. It is widely used in medical equipment, automatic control, printing machinery, packaging machinery, food preservation, and other fields.

[0003] At present, a Chinese patent with publication number CN112555119A and publication date March 26, 2021 discloses an oil-free vacuum pump, comprising a first mounting shell, a second mounting shell, a dual-axis motor and two cylinders, the two cylinders are respectively arranged in the first mounting shell and the second mounting shell, the two output shafts of the dual-axis motor are both sleeved with a first bearing, a rotating seat and a cooling fan, the interior of the first mounting shell and the interior of the second mounting shell are both provided with a bearing mounting frame, the first bearing is arranged on the bearing mounting frame, the rotating seat comprises an integrally formed rotating part and a deflection part, the deflection part is sleeved on the end of the rotating part, the axial hole and the rotating part of the cooling fan are respectively sleeved on the output shaft of the dual-axis motor, the rotating part is sleeved with a second bearing, a connecting rod is arranged between the second bearing and the cylinder, the bottom of the connecting rod is sleeved on the second bearing, the top of the connecting rod extends into the interior of the cylinder, the top cover of the cylinder is provided with a valve plate, a piston is arranged in the cylinder, and the piston is arranged between the top of the connecting rod and the valve plate.

[0004] The principle of the oil-free vacuum pump is as follows: a dual-axis motor drives the connecting rods on the two output shafts to reciprocate up and down, and the two connecting rods respectively drive the pistons in the cylinder of the first mounting shell and the pistons in the cylinder of the second mounting shell, thereby causing the pistons to reciprocate and change the pressure in the cylinder, and then causing the valve plate on the top of the cylinder to complete the exhaust and suction. The two cylinders have large capacities, which can enable the vacuum pump to meet the working intensity of continuous suction and discharge at the same time, and make the vacuum pump more flexible in choosing to realize suction and discharge. At the same time, the cooling fans on the two output shafts rotate with the output shafts, and continuously cool the dual-axis motors when the vacuum pump realizes suction and discharge, thereby ensuring the stable and efficient operation of the vacuum pump.

[0005] However, this type of dual-axis motor does not have a braking function. Therefore, after the power supply of the dual-axis motor is cut off, under the action of inertia, the output shaft of the dual-axis motor will still drive the piston to reciprocate several times, so that the vacuum pump continues to perform suction and discharge operations; this will be not conducive to the precise control of the vacuum pump to perform suction and discharge operations. Summary of the invention

[0006] The object of the present invention is to provide an air compressor vacuum pump structure, which can brake the output shaft after cutting off the power supply of the dual-shaft motor, thereby facilitating the precise control of the vacuum pump for suction and discharge operations.

[0007] The above technical objectives of the present invention are achieved through the following technical solutions: an air compressor vacuum pump structure, comprising a first mounting shell, a second mounting shell, a cylinder body located at the upper ends of the first mounting shell and the second mounting shell, a top cover located at the upper end of the cylinder body, and a double-axis motor located between the first mounting shell and the second mounting shell, wherein the first mounting shell and the second mounting shell are both provided with an eccentric block and a connecting rod connected to the output shaft of the double-axis motor, the upper end of the connecting rod is provided with a piston disk embedded in the cylinder body, the first mounting shell and the second mounting shell are both provided with a cooling fan connected to the output shaft of the double-axis motor, and the first mounting shell and the second mounting shell are both provided with a cooling fan connected to the output shaft of the double-axis motor. A wrapping cover wrapped around the outside of the cooling fan is provided on the top, a connecting end extending into the wrapping cover is provided at the end of the output shaft of the dual-axis motor, a connecting end extending into the wrapping cover is provided on the inner wall of the peripheral side of the wrapping cover, three connecting plates evenly spaced along the peripheral side of the connecting ring are provided in the connecting ring, a slide is slidably connected to the connecting plate, a connecting arm extending toward one side of the connecting end is provided at one end of the slide, a brake block for pressing against the outer wall of the connecting end is provided at the end of the connecting arm away from the slide, and a driving component for driving the three brake blocks to press against the outer wall of the connecting end when the dual-axis motor is cut off from power is provided in the wrapping cover.

[0008] By adopting the above technical solution, when the power supply of the dual-axis motor is cut off, the driving assembly immediately drives the three brake blocks to press against the outer wall around the connecting end, thereby braking the output shaft of the dual-axis motor through the friction force formed between the brake blocks and the connecting end. Finally, the output shaft can be braked after the power supply of the dual-axis motor is cut off, which helps to accurately control the suction and discharge operations of the vacuum pump.

[0009] The present invention is further configured as follows: a dovetail slot is provided on the connection plate, and a dovetail slider embedded in the dovetail slot is provided on the side wall of the slide plate.

[0010] By adopting the above technical solution, the dovetail slider of the skateboard is embedded in the dovetail groove on the connecting plate, so that the skateboard can be stably slidably connected to the connecting plate, which facilitates the stable movement of the brake block.

[0011] The present invention is further configured as follows: the driving assembly includes a mounting shaft rotatably connected to the connecting plate, an eccentric disk fixed on the mounting shaft, a rotating sleeve sleeved on the circumference of the eccentric disk, a first driving arm connected to the rotating sleeve at one end and hinged to the outer wall of the slide plate at the other end, a second driving arm in a V shape and fixed to the mounting shaft at the middle, two linkage rods arranged between the three eccentric disks and hinged at one end to the end of the second driving arm and at the other end to the end of the adjacent second driving arm, and a driving cylinder hinged at one end to the connecting ring and at the other end to the end of the second driving arm.

[0012] By adopting the above technical scheme, when the power supply of the dual-axis motor is cut off, the piston rod of the driving cylinder immediately extends toward the side of the second driving arm, thereby pushing the second driving arm to rotate. After the second driving arm rotates, it can drive the eccentric disk to rotate, and the rotation of the eccentric disk can push the rotating sleeve to swing downward, and then the rotating sleeve can drive the slide plate to move toward the side close to the connecting end through the first driving arm, so that the brake block is pressed against the outer wall of the connecting end; wherein the second driving arm can drive the three eccentric disks to rotate at the same time through the linkage rod, and after the three eccentric disks rotate at the same time, they can drive the three brake blocks to press against the outer wall of the connecting end at the same time, and at this time, the output shaft of the dual-axis motor can be braked by the friction force formed between the three brake blocks and the connecting end.

[0013] The present invention is further configured as follows: a convex ring is arranged on the inner wall of the peripheral side of the rotating sleeve, and a ring groove for the convex ring to be embedded is opened on the outer wall of the peripheral side of the eccentric disk.

[0014] By adopting the above technical solution, the rotating sleeve is embedded in the annular groove on the peripheral side of the eccentric disk by means of the convex ring, thereby preventing the rotating sleeve from coming off the eccentric disk, which is conducive to the stable installation of the rotating sleeve on the eccentric disk.

[0015] The present invention is further configured as follows: a filter screen is also provided in the wrapping cover, a mounting ring is provided on the peripheral side of the filter screen, an opening groove for the connection end to pass through is provided on the filter screen and the mounting ring, a long strip opening for the filter screen to pass through is provided on the lower surface of the wrapping cover, an extension plate passing through the long strip opening is provided on the lower side of the mounting ring, a positioning plate for fitting on the outer wall of the wrapping cover is provided on the side of the extension plate away from the mounting ring, a pressure column is provided at the end of the second driving arm, a pressure block is provided at the end of the pressure column away from the second driving arm, a magnet column is provided on the pressure block, a groove for the magnet column to be embedded is provided on the pressure column, a connecting spring with one end connected to the bottom wall of the groove and the other end connected to the magnet column is provided in the groove, an iron ring for attracting the magnet column is fixed in the wrapping cover and located on the side of the mounting ring away from the eccentric disk; when the brake block is pressed against the connection end, the pressure block moves to one side of the filter screen, and when the brake block is removed from the connection end, the pressure block moves to one side of the mounting ring and presses the mounting ring against the support ring.

[0016] By adopting the above technical solution, when the swing of the second driving arm drives the brake block to press against the connecting end, the vacuum pump is in a stopped state. At this time, the pressure block at the end of the second driving arm moves to one side of the filter screen, and the magnet column is not in an attracted state with the iron ring. Under the elastic restoring force of the connecting spring, the magnet column retracts into the groove, so the filter screen is in a relaxed state in the wrapping cover. At this time, the operator can smoothly pull out the filter screen along the long strip, so as to facilitate the cleaning of dust on the surface of the filter screen, which is helpful for the filter screen to have a good filtering effect when the vacuum pump is running next time. When the reverse swing of the second driving arm drives the brake block to move away from the connecting end, the vacuum pump is in operation and the output shaft of the dual-axis motor rotates. The filter screen needs to play a stable filtering role on the airflow entering the package cover. At this time, the pressure block at the end of the second driving arm moves to one side of the mounting ring, and the magnet column can generate magnetic attraction between the magnet column and the iron ring. After the magnet column extends out of the groove, it can drive the pressure block to press the mounting ring against the iron ring. The position of the filter screen in the package cover can be limited by the pressure block to avoid the shaking of the vacuum pump body causing the filter screen to fall out of the long strip mouth, and finally the dual utilization of the second driving arm can be realized.

[0017] The present invention is further configured as follows: the wrapping cover is provided with a plurality of air inlet hole groups evenly spaced along the circumference of the connecting end, the air inlet hole group includes three fan-shaped holes, and a closing frame for closing the three fan-shaped holes is slidably connected on the inner wall of the wrapping cover and at the position of each air inlet hole group, the closing frame includes three closing plates corresponding to the three fan-shaped holes respectively, and fixed arms arranged on the sides of the three closing plates, and a linkage component is arranged between the connecting arm and the closing frame to drive the closing plate to cover the fan-shaped hole when the connecting arm moves toward the side close to the connecting end.

[0018] By adopting the above technical solution, when the swing of the second driving arm drives the brake block to press against the connecting end, the connecting arm moves toward the side close to the connecting end. At this time, the linkage assembly can be used to drive the closing frame to move, so that the covering plate can cover the fan-shaped hole. Finally, the air inlet hole group on the package cover can be closed when the vacuum pump is in the shutdown state to prevent external impurities from entering the package cover and ensure the cleanliness of the inside of the vacuum pump.

[0019] The present invention is further configured as follows: a first connecting ear is provided on the closed frame, a guide rod is provided on the first connecting ear and extends toward the side close to the connecting end, a second connecting ear corresponding to the position of the guide rod is provided on the inner wall of the wrapping cover, a guide hole is provided on the second connecting ear for the guide rod to pass through, and a return spring is sleeved on the guide rod with one end connected to the first connecting ear and the other end connected to the second connecting ear.

[0020] By adopting the above technical solution, the guide rod on the first connecting ear is passed through the guide hole on the second connecting ear. At this time, the movement of the closing frame can be guided by the guide rod. At the same time, one end of the reset spring is connected to the first connecting ear and the other end is connected to the second connecting ear. When the reverse swing of the second driving arm drives the brake block to move away from the connecting end, the elastic restoring force of the reset spring can drive the closing frame to move in the opposite direction, thereby moving the closing plate away from the fan-shaped hole.

[0021] The present invention is further configured as follows: the linkage assembly includes two guide posts arranged on the inner wall of the wrapping cover, a traction post arranged on the connecting arm, and a connecting rope with one end connected to the guide rod away from the second connecting ear and the other end connected to the traction post after passing through the two guide posts.

[0022] By adopting the above technical solution, when the swing of the second driving arm drives the brake block to press against the connecting end, the connecting arm moves toward the side close to the connecting end. At this time, the connecting arm can drive the traction column to move, and the traction column can drive the guide rod to move through the connecting rope, thereby driving the covering plate to cover the fan-shaped hole.

[0023] The present invention is further configured as follows: two third connecting ears are provided on both sides of the first mounting shell, threaded holes are provided in the third connecting ears, two fourth connecting ears are provided on both sides of the second mounting shell, through holes are provided in the fourth connecting ears, and long rod bolts are provided between the first mounting shell and the second mounting shell, passing through the through holes and being threadedly connected in the threaded holes.

[0024] By adopting the above technical solution, when the first mounting shell, the second mounting shell and the dual-axis motor are assembled, a long rod bolt is passed through the through hole of the fourth connecting ear and then threadedly connected to the threaded hole on the third connecting ear. At this time, a detachable connection between the first mounting shell and the second mounting shell can be achieved.

[0025] The beneficial effects of the present invention are as follows: when the power supply of the dual-axis motor is cut off, the piston rod of the driving cylinder immediately extends toward the side of the second driving arm, thereby pushing the second driving arm to rotate. After the second driving arm rotates, the eccentric disk can be driven to rotate, and the rotation of the eccentric disk can push the rotating sleeve to swing downward, and then the rotating sleeve can drive the slide plate to move toward the side close to the connecting end through the first driving arm, so that the brake block is pressed against the outer wall of the connecting end; wherein the second driving arm can simultaneously drive the three eccentric disks to rotate through the linkage rod, and after the three eccentric disks rotate at the same time, the three brake blocks can be driven to press against the outer wall of the connecting end at the same time, and at this time, the output shaft of the dual-axis motor can be braked by the friction force formed between the three brake blocks and the connecting end, and finally the output shaft can be braked after the power supply of the dual-axis motor is cut off, thereby facilitating the precise control of the suction and discharge operations of the vacuum pump; When the swing of the second driving arm drives the brake block to press against the connecting end, the vacuum pump is in a stopped state. At this time, the pressure block at the end of the second driving arm moves to one side of the filter screen, and the magnet column is not in an attracted state with the iron ring. Under the elastic restoring force of the connecting spring, the magnet column retracts into the groove, so the filter screen is in a relaxed state in the wrapping cover. At this time, the operator can smoothly pull out the filter screen along the long strip, so as to facilitate the cleaning of the dust on the surface of the filter screen, which is helpful for the filter screen to have a good filtering effect when the vacuum pump is running next time. When the second driving arm swings in the opposite direction, the filter screen will be easily removed. When the brake block is driven to move away from the connection end, the vacuum pump is in operation and the output shaft of the dual-axis motor rotates. The filter screen needs to play a stable filtering role on the airflow entering the package cover. At this time, the pressure block at the end of the second driving arm moves to one side of the mounting ring, and the magnet column can generate magnetic attraction with the iron ring. After the magnet column extends out of the groove, it can drive the pressure block to press the mounting ring against the iron ring. The position of the filter screen in the package cover can be limited by the pressure block to avoid the vibration of the vacuum pump body causing the filter screen to fall out of the long strip mouth, and finally the dual use of the second driving arm can be realized; At the same time, when the swing of the second driving arm drives the brake block to press against the connecting end, the connecting arm moves toward the side close to the connecting end. At this time, the connecting arm can drive the traction column to move toward the side close to the connecting end, and the traction column can drive the guide rod to move through the connecting rope, thereby driving the covering plate to cover the fan-shaped hole, and the reset spring is compressed, and finally the air inlet hole group on the package cover can be closed when the vacuum pump is in the shutdown state to prevent external impurities from entering the package cover and ensure the cleanliness of the inside of the vacuum pump; and when the reverse swing of the second driving arm drives the brake block to move away from the connecting end, the connecting arm drives the traction column to move toward the side away from the connecting end, and then the elastic restoring force of the reset spring can drive the closing frame to move in the opposite direction, thereby removing the closing plate from the fan-shaped hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a partial structural exploded diagram of the present invention; Figure 3 is an enlarged view of the structure of the wrapping cover in the present invention; Figure 4 It is an enlarged view of the structure of the wrapping cover of the present invention after the iron ring and the filter screen are omitted; Figure 5 It is a schematic diagram of the connection relationship between the connecting ring, the connecting plate, the sliding plate, the brake block and the driving assembly in the present invention, at which time the reverse swing of the second driving arm drives the brake block to move away from the connecting end; Figure 6 It is a partial enlarged view of the connection relationship between the connecting ring, the connecting plate, the sliding plate, the brake block and the driving assembly in the present invention; Figure 7 It is a cross-sectional view of the connection relationship between the eccentric disk and the rotating sleeve in the present invention; Figure 8 It is a partial structural exploded view of the package cover in the present invention, wherein the filter screen is exploded; Fig. 9 1 is a schematic plan view of the positional relationship between the iron ring, the filter screen, the mounting ring, the pressure column and the pressure block in the present invention, wherein the dotted line indicates the position where the pressure block moves to one side of the filter screen when the swing of the second driving arm drives the brake block to press against the connecting end; Fig.10 It is a schematic diagram of the connection relationship between the connecting ring, the connecting plate, the sliding plate, the brake block and the driving assembly in the present invention, and at this time, the swing of the second driving arm drives the brake block to press against the connecting end; Fig.11 It is an enlarged view of the structure of the wrapping cover in the present invention after the iron ring, the filter screen, the connecting ring and the driving assembly are omitted; Fig.12 It is a schematic diagram of the connection relationship between the second connecting ear, the closed frame, and the first connecting ear in the present invention.

[0028] In the figure, 11, first mounting shell; 111, third connecting ear; 112, threaded hole; 12, second mounting shell; 121, fourth connecting ear; 122, through hole; 123, long rod bolt; 13, cylinder body; 14, top cover; 15, dual-axis motor; 151, connecting end; 16, eccentric block; 17, connecting rod; 171, piston disc; 18, cooling fan; 2, wrapping cover; 21, connecting ring; 22, connecting plate; 221, dovetail slide; 23, iron ring; 24, long strip mouth; 25, second connecting ear; 251, guide hole; 3, slide plate; 31, connecting arm; 311, brake block; 32, dovetail slider; 4, driving assembly; 41, mounting shaft; 42. eccentric disk; 421. annular groove; 43. rotating sleeve; 431. convex ring; 44. first driving arm; 45. second driving arm; 451. pressure column; 4511. groove; 4512. connecting spring; 452. pressure block; 4521. magnet column; 46. linkage rod; 47. driving cylinder; 5. filter screen; 51. mounting ring; 52. opening groove; 53. extension plate; 54. positioning plate; 6. air inlet hole group; 61. fan-shaped hole; 7. closing frame; 71. closing plate; 72. fixed arm; 701. first connecting ear; 702. guide rod; 703. reset spring; 8. linkage assembly; 81. guide column; 82. traction column; 83. connecting rope. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] A vacuum pump structure for an air compressor, referring to Figure 1 , Figure 2 The vacuum pump structure of the air compressor includes a first mounting shell 11, a second mounting shell 12, a cylinder body 13, a top cover 14, and a double-shaft motor 15, wherein the cylinder body 13 is fixed to the upper ends of the first mounting shell 11 and the second mounting shell 12, and the top cover 14 is bolted to the upper end of the cylinder body 13, and the double-shaft motor 15 is fixed between the first mounting shell 11 and the second mounting shell 12 by bolts, and the first mounting shell 11 and the second mounting shell 12 are both provided with a motor connected to the output shaft of the double-shaft motor 15. The eccentric block 16 and the connecting rod 17 are integrally provided with a piston disk 171 embedded in the cylinder body 13 at the upper end of the connecting rod 17, and the first mounting shell 11 and the second mounting shell 12 are both provided with a cooling fan 18 fixed on the output shaft of the dual-axis motor 15; the dual-axis motor 15 drives the eccentric blocks 16 on the two output shafts, so that the connecting rod 17 and the piston disk 171 make up and down reciprocating motions, thereby changing the pressure in the cylinder body 13, and finally completing the exhaust and suction operations of the vacuum pump at the position of the top cover 14.

[0031] Reference Figure 1 Two third connecting ears 111 are integrally provided on both sides of the first mounting shell 11, and a threaded hole 112 is opened in the third connecting ear 111. At the same time, two fourth connecting ears 121 are integrally provided on both sides of the second mounting shell 12, and a through hole 122 is opened in the fourth connecting ear 121, wherein a long rod bolt 123 that passes through the through hole 122 and is threadedly connected in the threaded hole 112 is provided between the first mounting shell 11 and the second mounting shell 12.

[0032] Reference Figure 3 , Figure 4 , Figure 5 , Figure 6 The first mounting shell 11 and the second mounting shell 12 are both fixed with a wrapping cover 2 wrapped around the outside of the cooling fan 18 by bolts, wherein the output shaft end of the dual-axis motor 15 is integrally provided with a connecting end 151 extending into the wrapping cover 2, and a connecting ring 21 is welded on the inner wall of the peripheral side of the wrapping cover 2, and at the same time, three connecting plates 22 uniformly spaced along the peripheral side of the connecting ring 21 are integrally provided in the connecting ring 21, and a slide plate 3 is slidably connected to the connecting plate 22, wherein a dovetail groove 221 is provided on the connecting plate 22, and a dovetail slider 32 embedded in the dovetail groove 221 is integrally provided on the side wall of the slide plate 3; at the same time, a connecting arm 31 extending toward one side of the connecting end 151 is integrally provided at one end of the slide plate 3, and a brake block 311 for pressing against the outer wall of the connecting end 151 is fixed by bolts at the end of the connecting arm 31 away from the slide plate 3.

[0033] Reference Figure 5 , Figure 6 , Figure 7, the wrapping cover 2 is also provided with a driving assembly 4 for driving the three brake blocks 311 to press against the outer wall of the connecting end 151 when the dual-axis motor 15 is powered off, the driving assembly 4 includes a mounting shaft 41, an eccentric disk 42, a rotating sleeve 43, a first driving arm 44, a second driving arm 45, a linkage rod 46, and a driving cylinder 47, wherein one end of the mounting shaft 41 is rotatably connected to the connecting plate 22 through a bearing, and the eccentric disk 42 is welded to the mounting shaft 41 and eccentrically arranged; at the same time, the rotating sleeve 43 is sleeved on the eccentric disk 42, and a convex ring 431 is integrally arranged on the inner wall of the peripheral side of the rotating sleeve 43, wherein the outer wall of the peripheral side of the eccentric disk 42 is An annular groove 421 is provided for the convex ring 431 to be embedded. At this time, the rotating sleeve 43 is rotatably connected to the eccentric disk 42; at the same time, one end of the first driving arm 44 is welded to the outer wall of the rotating sleeve 43 and the other end is hinged to the outer wall of the slide plate 3, and the second driving arm 45 is V-shaped and the middle part is welded to the mounting shaft 41, wherein two linkage rods 46 are provided, and the two linkage rods 46 are located between the three eccentric disks 42, and at the same time, one end of the linkage rod 46 is hinged to the end of the second driving arm 45 and the other end is hinged to the end of the adjacent second driving arm 45; and the driving cylinder 47 is hinged to the connecting ring 21 at one end and to the end of the second driving arm 45 at the other end.

[0034] Reference Figure 3 , Figure 4 , Figure 6 , Figure 8 , Fig. 9 , Fig.10 A filter screen 5 is also provided in the wrapping cover 2, and a mounting ring 51 is welded on the peripheral side of the filter screen 5, wherein the filter screen 5 and the mounting ring 51 are both provided with an opening groove 52 for the connection end 151 to pass through, and a long strip opening 24 for the filter screen 5 to pass through is provided at the lower surface of the wrapping cover 2, and an extension plate 53 passing through the long strip opening 24 is integrally provided on the lower side of the mounting ring 51, wherein a positioning plate 54 for fitting on the outer wall of the wrapping cover 2 is welded on the side of the extension plate 53 away from the mounting ring 51; and a pressure column 451 is also integrally provided at the end of the second driving arm 45, and a pressure block 452 is provided at the end of the pressure column 451 away from the second driving arm 45, and the pressure block 452 is made of rubber material , and a magnet column 4521 is bonded to the pressing block 452, wherein a groove 4511 is provided on the pressing column 451 for the magnet column 4521 to be embedded, and a connecting spring 4512 is provided in the groove 4511 with one end bonded to the bottom wall of the groove 4511 and the other end bonded to the magnet column 4521, and an iron ring 23 for attracting the magnet column 4521 is welded in the wrapping cover 2 and on the side of the mounting ring 51 away from the eccentric disk 42; when the brake block 311 is pressed against the connecting end 151, the pressing block 452 moves to one side of the filter screen 5, and when the brake block 311 is removed from the connecting end 151, the pressing block 452 moves to one side of the mounting ring 51 and presses the mounting ring 51 against the supporting ring.

[0035] Reference Figure 1 , Figure 3 , Fig.11 , Fig.12 The wrapping cover 2 is provided with a plurality of air inlet hole groups 6 evenly spaced along the circumference of the connecting end 151, and the air inlet hole group 6 includes three fan-shaped holes 61, wherein a closing frame 7 for closing the three fan-shaped holes 61 is slidably connected on the inner wall of the wrapping cover 2 and at the position of each air inlet hole group 6, and the closing frame 7 includes three closing plates 71 corresponding to the three fan-shaped holes 61, and a fixed arm 72 integrally arranged at the sides of the three closing plates 71, a first connecting ear 701 is welded on the closing frame 7, and a guide rod 702 extending toward the side close to the connecting end 151 is welded on the first connecting ear 701, and a second connecting ear 25 corresponding to the position of the guide rod 702 is welded on the inner wall of the wrapping cover 2, and a guide hole 251 for the guide rod 702 to pass through is provided on the second connecting ear 25, wherein a return spring 703 is sleeved on the guide rod 702, one end of which is welded to the first connecting ear 701 and the other end is welded to the second connecting ear 25.

[0036] Reference Figure 4 , Figure 6 , Fig.11 , Fig.12 A linkage assembly 8 is also provided between the connecting arm 31 and the closing frame 7, which drives the closing plate 71 to seal the fan-shaped hole 61 when the connecting arm 31 moves toward the side close to the connecting end 151. The linkage assembly 8 includes a guide column 81, a traction column 82, and a connecting rope 83. Two guide columns 81 are provided at each closing frame 7 position, and the ends of the guide columns 81 are welded to the inner wall of the wrapping cover 2. The traction column 82 is welded to the connecting arm 31. The connecting rope 83 has one end bonded and fixed to the guide rod 702 away from the second connecting ear 25, and the other end passes through the two guide columns 81 and is bundled and fixed to the traction column 82.

[0037] Principle: When the power supply of the dual-axis motor 15 is cut off, the piston rod of the driving cylinder 47 immediately extends toward the second driving arm 45, thereby pushing the second driving arm 45 to rotate. After the second driving arm 45 rotates, the eccentric disk 42 can be driven to rotate, and the rotation of the eccentric disk 42 can push the rotating sleeve 43 to swing downward, and then the rotating sleeve 43 can drive the slide plate 3 to move toward the side close to the connecting end 151 through the first driving arm 44, so that the brake block 311 is pressed against the outer wall of the connecting end 151; wherein the second driving arm 45 can simultaneously drive the three eccentric disks 42 to rotate through the linkage rod 46, and the three eccentric disks 42 can simultaneously drive the three brake blocks 311 to press against the outer wall of the connecting end 151, at this time, the output shaft of the dual-axis motor 15 can be braked by the friction force formed between the three brake blocks 311 and the connecting end 151, and finally the output shaft can be braked after the power supply of the dual-axis motor 15 is cut off, thereby facilitating the precise control of the vacuum pump for suction and discharge operations; When the swing of the second driving arm 45 drives the brake block 311 to press against the connecting end 151, the vacuum pump is in a shutdown state. At this time, the pressure block 452 at the end of the second driving arm 45 moves to one side of the filter screen 5. The magnet column 4521 is not in an attracted state with the iron ring 23. Under the elastic restoring force of the connecting spring 4512, the magnet column 4521 retracts into the groove 4511. Therefore, the filter screen 5 is in a relaxed state in the wrapping cover 2. At this time, the operator can smoothly pull out the filter screen 5 along the long strip 24, so as to facilitate the cleaning of the dust on the surface of the filter screen 5, which is helpful for the filter screen 5 to have a good filtering effect when the vacuum pump is running next time. When the car block 311 is removed from the connecting end 151, the vacuum pump is in operation and the output shaft of the dual-axis motor 15 rotates. The filter screen 5 needs to play a stable filtering role on the airflow entering the package cover 2. At this time, the pressing block 452 at the end of the second driving arm 45 is moved to one side of the mounting ring 51, and the magnet column 4521 can generate a magnetic attraction with the iron ring 23. After the magnet column 4521 extends out of the groove 4511, it can drive the pressing block 452 to press the mounting ring 51 against the iron ring 23. The position of the filter screen 5 in the package cover 2 can be limited by the pressing block 452 to avoid the shaking of the vacuum pump body causing the filter screen 5 to fall out of the long strip opening 24, and finally the dual use of the second driving arm 45 can be achieved. At the same time, when the swing of the second driving arm 45 drives the brake block 311 to press against the connecting end 151, the connecting arm 31 moves toward the side close to the connecting end 151. At this time, the connecting arm 31 can drive the traction column 82 to move toward the side close to the connecting end 151, and the traction column 82 can drive the guide rod 702 to move through the connecting rope 83, thereby driving the covering plate to cover the fan-shaped hole 61, and the return spring 703 is compressed, and finally the air inlet hole group 6 on the package cover 2 can be closed when the vacuum pump is in the shutdown state, so as to prevent external impurities from entering the package cover 2 and ensure the cleanliness of the inside of the vacuum pump; and when the reverse swing of the second driving arm 45 drives the brake block 311 to move away from the connecting end 151, the connecting arm 31 drives the traction column 82 to move toward the side away from the connecting end 151, and then the elastic restoring force of the return spring 703 can drive the closing frame 7 to move in the opposite direction, so that the closing plate 71 is removed from the fan-shaped hole 61.

Claims

1. A vacuum pump structure of an air compressor, comprising a first mounting shell (11), a second mounting shell (12), a cylinder body (13) located at the upper ends of the first mounting shell (11) and the second mounting shell (12), a top cover (14) located at the upper end of the cylinder body (13), and a double-shaft motor (15) located between the first mounting shell (11) and the second mounting shell (12), wherein an eccentric block (16) and a connecting rod (17) connected to the output shaft of the double-shaft motor (15) are disposed in the first mounting shell (11) and the second mounting shell (12), a piston disc (171) embedded in the cylinder body (13) is disposed at the upper end of the connecting rod (17), a cooling fan (18) connected to the output shaft of the double-shaft motor (15) is disposed in the first mounting shell (11) and the second mounting shell (12), and a wrapping cover (2) wrapped around the outside of the cooling fan (18) is disposed on the first mounting shell (11) and the second mounting shell (12), characterized in that: The output shaft end of the dual-axis motor (15) is provided with a connection end (151) extending into the wrapping cover (2); a connection ring (21) is provided on the inner wall of the peripheral side of the wrapping cover (2); three connection plates (22) are provided in the connection ring (21) and are evenly spaced along the peripheral side of the connection ring (21); a slide plate (3) is slidably connected to the connection plate (22); a connection arm (31) extending toward a side of the connection end (151) is provided at one end of the slide plate (3); a brake block (311) for pressing against the outer wall of the connection end (151) is provided at the end of the connection arm (31) away from the slide plate (3); and a drive component (4) is provided in the wrapping cover (2) for driving the three brake blocks (311) to press against the outer wall of the connection end (151) when the dual-axis motor (15) is powered off.

2. The air compressor vacuum pump structure according to claim 1, characterized in that: A dovetail slide groove (221) is provided on the connecting plate (22), and a dovetail slider (32) embedded in the dovetail slide groove (221) is provided on the side wall of the slide plate (3).

3. The air compressor vacuum pump structure according to claim 1, characterized in that: The driving assembly (4) comprises a mounting shaft (41) rotatably connected to the connecting plate (22), an eccentric disk (42) fixed on the mounting shaft (41), a rotating sleeve (43) sleeved on the circumference of the eccentric disk (42), a first driving arm (44) connected to the rotating sleeve (43) at one end and hinged to the outer wall of the slide plate (3) at the other end, a second driving arm (45) in a V shape and fixed to the mounting shaft (41) at the middle, two linkage rods (46) arranged between the three eccentric disks (42) and hinged to the end of the second driving arm (45) at one end and hinged to the end of the adjacent second driving arm (45) at the other end, and a driving cylinder (47) hinged to the connecting ring (21) at one end and hinged to the end of the second driving arm (45) at the other end.

4. The air compressor vacuum pump structure according to claim 3, characterized in that: A convex ring (431) is provided on the inner wall of the circumference of the rotating sleeve (43), and an annular groove (421) for the convex ring (431) to be embedded is provided on the outer wall of the circumference of the eccentric disc (42).

5. The air compressor vacuum pump structure according to claim 3, characterized in that: A filter screen (5) is also provided in the wrapping cover (2), and a mounting ring (51) is provided on the peripheral side of the filter screen (5). An opening groove (52) for the connection end (151) to pass through is provided on the filter screen (5) and the mounting ring (51). A long strip opening (24) for the filter screen (5) to pass through is provided on the lower surface of the wrapping cover (2). An extension plate (53) passing through the long strip opening (24) is provided on the lower side of the mounting ring (51). A positioning plate (54) for fitting on the outer wall of the wrapping cover (2) is provided on the side of the extension plate (53) away from the mounting ring (51). A pressure column (451) is provided at the end of the second driving arm (45). A pressure block (452) is provided at the end of the pressure column (451) away from the second driving arm (45). A magnet column (4521) is provided, a groove (4511) is provided on the pressure column (451) for the magnet column (4521) to be embedded, a connecting spring (4512) is provided in the groove (4511) and has one end connected to the bottom wall of the groove (4511) and the other end connected to the magnet column (4521), and an iron ring (23) for attracting the magnet column (4521) is fixed in the wrapping cover (2) and located on the side of the mounting ring (51) away from the eccentric disk (42); when the brake block (311) is pressed against the connecting end (151), the pressure block (452) moves to one side of the filter screen (5), and when the brake block (311) is removed from the connecting end (151), the pressure block (452) moves to one side of the mounting ring (51) and presses the mounting ring (51) against the supporting ring.

6. The air compressor vacuum pump structure according to claim 3, characterized in that: The wrapping cover (2) is provided with a plurality of air inlet hole groups (6) evenly spaced along the circumference of the connecting end (151), the air inlet hole group (6) comprising three fan-shaped holes (61), a closing frame (7) for closing the three fan-shaped holes (61) is slidably connected on the inner wall of the wrapping cover (2) and at the position of each air inlet hole group (6), the closing frame (7) comprising three closing plates (71) corresponding to the three fan-shaped holes (61) respectively, and a fixed arm (72) arranged at the side of the three closing plates (71), and a linkage component (8) is arranged between the connecting arm (31) and the closing frame (7) for driving the closing plate (71) to cover the fan-shaped hole (61) when the connecting arm (31) moves toward the side close to the connecting end (151).

7. The air compressor vacuum pump structure according to claim 6, characterized in that: The enclosing frame (7) is provided with a first connecting ear (701), and the first connecting ear (701) is provided with a guide rod (702) extending toward a side close to the connecting end (151). The inner wall of the wrapping cover (2) is provided with a second connecting ear (25) corresponding to the position of the guide rod (702), and the second connecting ear (25) is provided with a guide hole (251) for the guide rod (702) to pass through. The guide rod (702) is sleeved with a return spring (703) with one end connected to the first connecting ear (701) and the other end connected to the second connecting ear (25).

8. The air compressor vacuum pump structure according to claim 7, characterized in that: The linkage assembly (8) comprises two guide posts (81) arranged on the inner wall of the wrapping cover (2), a traction post (82) arranged on the connecting arm (31), and a connecting rope (83) having one end connected to an end of the guide rod (702) away from the second connecting ear (25) and the other end passing through the two guide posts (81) and then connected to the traction post (82).

9. The air compressor vacuum pump structure according to claim 1, characterized in that: Two third connecting ears (111) are provided on both sides of the first mounting shell (11), and threaded holes (112) are provided in the third connecting ears (111). Two fourth connecting ears (121) are provided on both sides of the second mounting shell (12), and through holes (122) are provided in the fourth connecting ears (121). A long rod bolt (123) is provided between the first mounting shell (11) and the second mounting shell (12), and passes through the through holes (122) and is then threadedly connected to the threaded holes (112).

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