A double-threaded screw reciprocating air pump

Abstract

A double-threaded screw reciprocating air pump, the pump body includes a cylinder sleeve, a cylinder piston, a piston ring, a double-threaded screw, a connecting pin, and a pump cover. The double-threaded screw includes a cylindrical section and a connecting end, and a left-handed and a right-handed thread groove are provided on the cylindrical section. The two thread grooves are respectively connected to each other at a reversing point and a lower reversing point on the thread groove. The connecting end is connected to the output shaft of the reducer or serves as the output shaft of the reducer. The connecting pin includes a cylindrical section and a front section. The front section is shaped to match the left-handed or right-handed thread groove. The front section is installed in the left-handed or right-handed thread groove of the double-threaded screw. The cylinder piston is sleeved on the cylindrical section of the double-threaded screw and is limited on the double-threaded screw by the connecting pin. It is driven by the double-threaded screw to move axially back and forth in the cylinder sleeve. An axial guide mechanism is provided between the reducer ring gear and the cylinder piston. The piston ring is installed in the cylinder piston and slides with the cylinder sleeve. The pump cover is fixed to the cylinder sleeve and is provided with a one-way intake and one-way exhaust mechanism.

Description

Technical Field

[0001] The present invention relates to an air pump, in particular to a double-threaded screw reciprocating air pump. Background Art

[0002] As vehicles become increasingly intelligent, they will be equipped with more lidars and cameras supporting automated driving. These sensors provide reliable sensing and accurate assessment of the driving environment, forming the link between automated parking, driver assistance, and the external environment. Due to the influence of external environmental factors, cleaning lidars and cameras is becoming increasingly important. Currently, cleaning lidars and cameras is performed by pumping a pressured cleaning fluid through a cleaning system. However, residual water droplets remain on the surfaces of the radars and cameras after cleaning, impacting their accuracy and posing a safety hazard. Therefore, after cleaning, the remaining water droplets must be immediately blown away to ensure proper operation, eliminate potential hazards, and ensure driving safety. Existing air pumps are typically connecting rod piston pumps. Due to the relatively high vibration and noise caused by the swinging connecting rod, the associated risk of pressure loss and reduced service life, making them unsuitable for this type of water droplet removal. Consequently, a suitable air pump design is urgently needed. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the above-mentioned defects of the prior art and provide a double-threaded screw reciprocating air pump with low vibration and noise, which can be suitable for purging vehicle radars and cameras.

[0004] The technical solution adopted by the present invention to solve the above technical problems is: a double-threaded screw reciprocating air pump, including a motor, a reducer and a pump body, the reducer is installed on the motor and is driven by the motor, the pump body includes a cylinder sleeve, a cylinder piston, a piston ring, a double-threaded screw, a connecting pin, and a pump cover, the double-threaded screw includes a cylindrical section and a connecting end, a left-handed thread or a left-handed thread groove and a right-handed thread or a right-handed thread groove are provided on the cylindrical section, the two threads or thread grooves are respectively connected to each other at the reversing point on the thread or thread groove and the reversing point below the thread or thread groove, the connecting end is connected to the output shaft of the reducer or serves as the output shaft of the reducer, the connecting end The pin includes a cylindrical section and a front section, the front section is shaped to cooperate with a left-handed thread groove or thread or a right-handed thread groove or thread, and the front section is installed in the left-handed thread groove or thread or the right-handed thread groove or thread of the double-thread screw. The cylinder piston is sleeved on the cylindrical section of the double-thread screw and is limited on the double-thread screw by the connecting pin, and is driven by the double-thread screw to move axially back and forth in the cylinder sleeve. An axial guide mechanism is provided between the reducer ring gear and the cylinder piston, the piston ring is installed in the annular groove of the cylinder piston and slides with the cylinder sleeve, the pump cover is fixed to the cylinder sleeve and is provided with a one-way air intake mechanism and a one-way exhaust mechanism, and the cylinder sleeve is installed on the reducer.

[0005] Preferably, the axial guide mechanism is as follows: an axial guide member is provided on the reducer ring gear, a corresponding axial guide hole is provided on the cylinder piston, the axial guide member is inserted into the axial guide hole, and the cylinder piston is guided by the axial guide member to perform axial reciprocating motion.

[0006] Better yet, a thread or thread groove intersection is set at the intersection of the left-handed thread or thread groove and the right-handed thread or thread groove between the upper reversing point of the thread or thread groove and the lower reversing point of the thread or thread groove of the double-thread screw. In this way, the length of the left-handed thread or thread groove and the right-handed thread or thread groove can be extended, thereby extending the stroke of the cylinder piston.

[0007] Preferably, a limiting portion is provided between the cylindrical section and the connecting end of the double-threaded screw, the cylindrical section of the double-threaded screw is mounted on the gear ring via a bearing, and the limiting portion is defined by a cylindrical bearing.

[0008] Preferably, the reducer is a planetary reduction gear, and connecting rods evenly distributed along the circumference are provided on the connecting ends of the double-threaded screws. The connecting rods serve as the central axes of the planetary wheels of the reducer, and the planetary wheels rotate around their respective connecting rods.

[0009] Preferably, the cylinder piston is provided with a through groove for accommodating the fixing part, and an arc groove is also provided in the through groove, and another arc groove is provided on the fixing part. The arc groove and the other arc groove form a cylindrical groove for accommodating the cylindrical section of the connecting pin, so that the cylindrical section of the connecting pin can rotate during movement. Spring clips are provided on both sides of the fixing part, and buckle grooves that cooperate with the spring clips on both sides of the fixing part are also provided on both sides of the through groove. After the fixing part is inserted into the through groove, its spring clips are buckled into the buckle grooves to be fixed. The arc bottom surface of the fixing part fits with the top arc surface of the front section of the connecting pin to fit the front section in the left thread groove or the right thread groove, which is convenient for installation.

[0010] Preferably, a V-shaped groove is further provided at the spring clip of the fixing piece, which can enhance the elasticity of the spring clip and make installation of the fixing piece more convenient.

[0011] Preferably, the one-way air intake mechanism is as follows: the pump cover is sequentially provided with a first-stage air intake hole and a second-stage air intake hole connected thereto, a diaphragm is installed in the second-stage air intake hole, and a third-stage air intake hole and an annular boss are also provided on the upper end surface of the cylinder liner, the two ends of the air intake spring are respectively pressed against the annular boss and the inner bottom surface of the diaphragm, the diaphragm seals the first-stage air intake hole normally, and when the cylinder piston runs from right to left in the inner cavity of the cylinder liner and forms a negative pressure, the external air pushes the diaphragm to compress the air intake spring to connect the first-stage air intake hole and the second-stage air intake hole.

[0012] Preferably, the one-way exhaust mechanism is as follows: a first-level exhaust hole is provided on the upper end surface of the cylinder liner, a second-level exhaust hole and a fourth-level exhaust hole are provided on corresponding positions of the pump cover, a through hole is provided between the second-level exhaust hole and the fourth-level exhaust hole, and three-level exhaust grooves are evenly provided around the through hole. A sealing rod and an exhaust spring are installed in the second-level exhaust hole, and the two ends of the exhaust spring are respectively pressed against the annular surface of the through hole and the annular boss of the sealing rod. Under normal circumstances, the bottom surface of the annular boss of the sealing rod seals the first-level exhaust hole on the cylinder liner.

[0013] Preferably, a mounting hole is provided on the first-level air inlet hole of the pump cover, and the air filter is installed in the mounting hole.

[0014] Preferably, the motor shaft of the motor is supported by a cylindrical bearing, and a stop copper ring and a gasket are respectively provided on both sides of the cylindrical bearing to prevent the motor shaft from axial movement and avoid noise generated during the gear transmission process of the reducer.

[0015] Compared with the existing technology, the advantages of the present invention are: the air pump uses a double-threaded screw to push the cylinder piston to perform continuous axial reciprocating motion to output gas, its structure is more compact, the vibration and noise are relatively small, and the service life is longer. Therefore, it is also suitable for purging automotive radars and cameras. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional schematic diagram of a double-threaded screw reciprocating air pump according to an embodiment of the present invention.

[0017] Figure 2 This is a structural diagram of a double-threaded screw reciprocating air pump according to an embodiment of the present invention.

[0018] Figure 3 yes Figure 2 AA cross-sectional view.

[0019] Figure 4 It is an exploded schematic diagram of a reducer according to an embodiment of the present invention.

[0020] Figure 5 It is an exploded schematic diagram of the pump body of an embodiment of the present invention.

[0021] Figure 6-1 、 6-2 It is a schematic structural diagram of a pump cover according to an embodiment of the present invention.

[0022] Figure 7 Schematic diagram of a cylinder piston according to an embodiment of the present invention.

[0023] Figure 8 Schematic diagram of a fixing member according to an embodiment of the present invention.

[0024] Figure 9-1 、 9-2 9-3 is a schematic diagram of a connecting pin according to an embodiment of the present invention.

[0025] Figure 10-1 、 10-2 , 10-3, and 10-4 are schematic diagrams of a double-threaded screw according to an embodiment of the present invention. Implementation Method

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] like Figure 1-1 0 shows a double-threaded screw reciprocating air pump, which includes a motor 1, a reducer 2 and a pump body 3.

[0028] The motor shaft 11 of the motor 1 is supported by a cylindrical bearing 14 , and a stop copper ring 12 and a gasket 13 are respectively provided on both sides of the cylindrical bearing 14 to prevent the motor shaft 11 from axial movement and avoid noise generated during the gear transmission process of the reducer 2 .

[0029] The reducer 2 can be any of various types of reducers, and its output shaft can be connected to the pump body 3 of the present invention and drive the pump body 3 .

[0030] The reducer 2 of this embodiment is a planetary gear reducer, which includes a ring gear 22 , a connecting flange 29 , planetary gears 25 , and a sun gear 26 .

[0031] The connecting flange 29 is provided with an inner hole 291 which is matched with the cylindrical surface 15 of the housing of the motor 1 for positioning, and is fixed to the motor 1 by screws 28 .

[0032] The gear ring 22 of the reducer 2 is provided with an inner circular surface 226 which cooperates with the arc surface 295 of the connecting flange 29 for radial positioning, and is fixed to the connecting flange 29 with a fixing pin 23, so that the connection between the two is more firm and reliable.

[0033] The sun gear 26 is fixed on the motor shaft 11 and meshes with the planetary gears 25 .

[0034] A cylindrical bearing 24 is set in the gear ring 22, and the lower end surface 242 and the inner hole surface 241 of the cylindrical bearing 24 respectively cooperate with the bottom surface 3142 and the cylinder 3141 set in the double-threaded screw 314 described below, so that the cylinder 3141 can rotate in the bearing 24 and the bottom surface 3142 is restricted to the lower end surface 242 of the cylindrical bearing 24.

[0035] The pump body 3 includes a cylinder sleeve 38 , a cylinder piston 311 , a piston ring 310 , a double-threaded screw 314 , a connecting pin 313 , a fixing member 312 , and a pump cover 32 .

[0036] The piston ring 310 is installed in the annular groove 3115 provided on the cylinder piston 311. The outer arc surface 3101 provided on the piston ring 310 is slidably matched with the inner cylindrical surface 383 provided on the cylinder sleeve 38 to play a sealing role.

[0037] The double-threaded screw 314 includes a cylindrical section 3141, a limiting portion 3142 and a connecting end. A left-handed thread groove 3147 and a right-handed thread groove 3148 are provided on the cylindrical section 3141. The two thread grooves are connected to each other at the upper reversing point 3149 and the lower reversing point 31410 of the thread groove respectively.

[0038] A thread groove intersection 3144 is also provided between the upper reversing point 3149 of the thread groove and the lower reversing point 31410 of the thread groove, so that the left-handed thread groove 3147 and the right-handed thread groove 3148 can intersect without affecting the passage of the front section 3132 of the connecting pin 313 described below, thereby extending the length of the left-handed thread groove and the right-handed thread groove, thereby extending the stroke of the cylinder piston.

[0039] The cylinder piston 311 is limited on the double-threaded screw 314 by the connecting pin 313 and is driven by the double-threaded screw 314 to move axially back and forth.

[0040] The cylinder piston 311 is sleeved on the cylindrical section 3141 of the double-threaded screw 314 .

[0041] The cylinder piston 311 is provided with a through groove 3111 for accommodating the fixing part 312, and an arc groove 3112 is also provided in the through groove 3111. Another arc groove 3121 is provided on the fixing part 312. The arc groove 3112 and the other arc groove 3121 form a cylindrical groove for accommodating the cylindrical section 3131 of the following connecting pin 313, so that the cylindrical section 3131 of the connecting pin 313 can rotate during movement.

[0042] Buckling grooves 3114 are further provided on both sides of the through slot 3111 to cooperate with the spring clips 3122 on both sides of the fixing member 312. After the fixing member 312 is inserted into the through slot 3111, its spring clips 3122 are buckled into the buckling grooves 3114 to fix it.

[0043] The connecting pin 313 includes a cylindrical section 3131 and a front section 3132. The front section 3132 is shaped to match the left-handed thread groove 3147 or the right-handed thread groove 3148. The front section 3132 is installed in the left-handed thread groove 3147 or the right-handed thread groove 3148 of the double-threaded screw 314. The inclined surface 3135 and the inner arc surface 3133 of the front section 3132 respectively match the thread groove side surface 3145 and the thread groove bottom surface 3146 of the left-handed thread groove 3147 or the right-handed thread groove 3148, so that the front section 3132 can move smoothly along the left-handed thread groove 3147 or the right-handed thread groove 3148.

[0044] Similarly, the coordination between the left-handed thread groove 3147 and the right-handed thread groove 3148 and the front section 3132 of the connecting pin 313 can also be changed as follows: the left-handed thread groove 3147 and the right-handed thread groove 3148 become left-handed threads and right-handed threads, and the two threads are connected to each other at the reversing point on the thread and the reversing point below the thread, respectively, and the corresponding front section 3132 of the connecting pin 313 becomes a shape that cooperates with the left-handed threads and the right-handed threads (such as a groove corresponding to the thread) and can move on the left-handed threads and the right-handed threads.

[0045] A thread intersection is also set between the upper reversal point of the thread and the lower reversal point of the thread, so that the left-hand thread and the right-hand thread can intersect without affecting the passage of the front section of the connecting pin described below, thereby extending the length of the left-hand thread and the right-hand thread, thereby extending the stroke of the cylinder piston.

[0046] The spring clips 3122 are provided on both sides of the fixing part 312, and the fixing part 312 is installed in the through groove 3111 provided in the cylinder piston 311. The spring clips 3122 of the fixing part 312 enter the buckle groove 3114 provided in the cylinder piston 311 and are fixed to prevent the fixing part 312 from loosening. At this time, the arc groove 3121 provided in the fixing part 312 and the arc groove 3112 provided in the cylinder piston 311 are combined to form a cylindrical hole that cooperates with the cylindrical section 3131 of the connecting pin 313, so as to facilitate the rotation of the connecting pin 313 during the sliding process of the left thread groove or the right thread groove, and the arc surface 3124 of the fixing part 312 fits with the top arc surface of the front section 3132 of the connecting pin 313 to fit the front section 3132 in the left thread groove or the right thread groove.

[0047] The cylindrical section 3141 of the double-threaded screw 314 is installed on the ring gear 22 through a cylindrical bearing 24. The limiting portion 3142 is defined by the lower end surface 242 of the cylindrical bearing 24. The connecting end of the double-threaded screw 314 is provided with three connecting rods 3143 evenly distributed along the circumference. The three connecting rods 3143 serve as the central axes of the three planetary gears 25 in the reducer, and the three planetary gears 25 rotate around their respective connecting rods 3143.

[0048] A V-shaped groove 3123 is further provided at the spring clip 3122 of the fixing member 312 , which can enhance the elasticity of the spring clip 3122 and facilitate the installation of the fixing member 312 .

[0049] The gear ring 22 is provided with a fixing hole 221 , and a guide member 21 is provided in the fixing hole 221 , which is slidably matched with and guided by the guide hole 3113 provided in the cylinder piston 311 , thereby better guiding the axial reciprocating motion of the cylinder piston 311 .

[0050] The cylinder sleeve 38 is fixed to the gear ring 22 of the reducer via a fixing pin 39 , and the cylindrical surface 222 of the gear ring 22 cooperates with the inner cylindrical surface 383 of the cylinder sleeve 38 for radial positioning.

[0051] The pump cover 32 is screwed into the threaded hole 385 provided in the cylinder sleeve 38 by means of the screw hole 323 thereof using the screw 31 , so that the pump cover 32 is fixed to the cylinder sleeve 38 .

[0052] A one-way air intake mechanism and a one-way air exhaust mechanism are provided between the pump cover 32 and the cylinder sleeve 38 .

[0053] The one-way air intake mechanism of this embodiment: the pump cover 32 is provided with a first-stage air intake hole 326 and a second-stage air intake hole 327 connected thereto in sequence, a diaphragm 34 is installed in the second-stage air intake hole 327, a third-stage air intake hole 381 and an annular boss 382 are also provided on the upper end surface 386 of the cylinder sleeve 38, the two ends of the air intake spring 35 are respectively in close contact with the annular boss 382 and the inner bottom surface 342 of the diaphragm 34, the diaphragm 34 seals the first-stage air intake hole 326 when the cylinder sleeve is in normal operation, and the diaphragm 34 seals the first-stage air intake hole 326 when the cylinder sleeve is in normal operation. When the piston 311 moves from right to left in the inner cavity of the cylinder sleeve 38 and forms a negative pressure, the external air pushes the diaphragm 34 to compress the intake spring 35, so that the first-stage air intake hole 326 and the second-stage air intake hole 327 are connected, and the external air is sucked in from the first, second and third-stage air intake holes in sequence. When the cylinder piston 311 moves from left to right in the inner cavity of the cylinder sleeve 38 and forms a positive pressure, the intake spring 35 returns to its original position and presses the diaphragm 34 to seal the first-stage air intake hole 326 to prevent air leakage in the inner cavity.

[0054] The one-way exhaust mechanism of this embodiment is as follows: the cylinder sleeve 38 is provided with a first-level exhaust hole 384 on the upper end surface 386, and the pump cover 32 is provided with a second-level exhaust hole 3210 and a fourth-level exhaust hole 324 at corresponding positions. A through hole 321 is provided between the second-level exhaust hole 3210 and the fourth-level exhaust hole 324, and four third-level exhaust grooves 322 are evenly provided around the through hole 321. A sealing rod 37 and an exhaust spring 36 are installed in the second-level exhaust hole 3210, and the two ends of the exhaust spring 36 are respectively pressed against the annular surface 329 of the through hole 321 and the annular boss 371 of the sealing rod 37. Under normal circumstances, the bottom surface 372 of the annular boss 371 of the sealing rod 37 seals the first-level exhaust hole 384 on the cylinder sleeve 38.

[0055] When the cylinder piston 311 runs from right to left to form negative pressure, the exhaust spring 36 presses the sealing rod 37 to form a seal to prevent air leakage. When the cylinder piston 311 runs from left to right in the inner cavity of the cylinder sleeve 38 to form positive pressure, the compressed gas in the inner cavity of the cylinder sleeve 38 pushes the annular boss 371 of the sealing rod 37 to compress the exhaust spring 36 and connect the first-level exhaust hole 384 with the second-level exhaust hole 3210. The compressed gas is exhausted from the first-level exhaust hole 384, the second-level exhaust hole 3210, the third-level exhaust groove 322 and the fourth-level exhaust hole 324 in sequence.

[0056] A mounting hole 325 is provided on the first-level air inlet hole 326 of the pump cover 32, and an air filter 33 is installed in the mounting hole 325. The air entering the pump body is filtered by the air filter 33 to prevent foreign matter from entering the pump cavity and damaging the inner cylindrical surface 383 of the cylinder liner or the outer arc surface 3101 of the piston ring 310, causing pressure relief or noise.

Claims

1. A double-threaded screw reciprocating air pump, characterized in that: The cam is connected to the cylinder to form a circle, and the cylinder piston is mounted on the cylinder to form a circle, and the cylinder piston is mounted on the cylinder to form a circle, and the cylinder piston is mounted on the cylinder to form a circle, and the cylinder piston is mounted on the cylinder to form a circle, and the cylinder piston is mounted on the cylinder to form a circle, and the cylinder piston is mounted on the cylinder to form a circle, and the cylinder piston is mounted on the cylinder to form a circle, and the cylinder piston is mounted on the cylinder to form a circle, and the cylinder piston is mounted on the cylinder to form a circle, and the cylinder piston is mounted on the cylinder An axial guide mechanism is provided between the reducer ring gear and the cylinder piston, the piston ring is installed in the annular groove of the cylinder piston and slides with the cylinder sleeve, the pump cover is fixed to the cylinder sleeve and is provided with a one-way air intake mechanism and a one-way exhaust mechanism, and the cylinder sleeve is installed on the reducer; the axial guide mechanism is: an axial guide member is provided on the reducer ring gear, a corresponding axial guide hole is provided on the cylinder piston, the axial guide member is inserted into the axial guide hole, and the cylinder piston is guided by the axial guide member to reciprocate axially; the cylinder piston is provided with a through groove for accommodating a fixing member, an arc groove is also provided in the through groove, another arc groove is provided on the fixing member, the arc groove and the other arc groove form a cylindrical groove for accommodating the cylindrical section of the connecting pin, and the cylindrical section of the connecting pin can rotate when moving, and spring clips are provided on both sides of the fixing member, and buckle grooves that cooperate with the spring clips on both sides of the fixing member are also provided on both sides of the through groove. After the fixing member is inserted into the through groove, its spring clip is buckled into the buckle groove and fixed, and the bottom surface of the fixing member is in contact with the front section of the connecting pin.

2. The double-threaded screw reciprocating air pump according to claim 1, characterized in that: A thread or thread groove intersection is provided at the intersection of the left-hand thread or thread groove and the right-hand thread or thread groove between the upper reversing point of the thread or thread groove and the lower reversing point of the thread or thread groove of the double-thread screw.

3. The double-threaded screw reciprocating air pump according to claim 1, characterized in that: A limiting portion is further provided between the cylindrical section and the connecting end of the double-threaded screw. The cylindrical section of the double-threaded screw is mounted on the gear ring through a cylindrical bearing, and the limiting portion is defined by the cylindrical bearing.

4. The double-threaded screw reciprocating air pump according to claim 1, characterized in that: The reducer is a planetary reduction gear, and connecting rods evenly distributed along the circumference are set on the connecting ends of the double-threaded screws. The connecting rods serve as the central axes of the planetary wheels of the reducer, and the planetary wheels rotate around their respective connecting rods.

5. The double-threaded screw reciprocating air pump according to claim 1, characterized in that: A V-shaped groove is also provided at the spring-locking position of the fixing piece.

6. The double-threaded screw reciprocating air pump according to claim 1, characterized in that: The one-way air intake mechanism is as follows: the pump cover is sequentially provided with a first-stage air intake hole and a second-stage air intake hole connected thereto, a diaphragm is installed in the second-stage air intake hole, and a third-stage air intake hole and an annular boss are also provided on the upper end surface of the cylinder sleeve. The two ends of the air intake spring are respectively pressed against the annular boss and the inner bottom surface of the diaphragm. The diaphragm seals the first-stage air intake hole normally. When the cylinder piston runs from right to left in the inner cavity of the cylinder sleeve and forms a negative pressure, the external air pushes the diaphragm to compress the air intake spring to connect the first-stage air intake hole and the second-stage air intake hole.

7. The double-threaded screw reciprocating air pump according to claim 1, characterized in that: The one-way exhaust mechanism is as follows: a first-level exhaust hole is provided on the upper end surface of the cylinder sleeve, a second-level exhaust hole and a fourth-level exhaust hole are provided on the corresponding positions of the pump cover, a through hole is provided between the second-level exhaust hole and the fourth-level exhaust hole, and a third-level exhaust groove is evenly provided around the through hole. A sealing rod and an exhaust spring are installed in the second-level exhaust hole, and the two ends of the exhaust spring are respectively tightly attached to the annular surface of the through hole and the annular boss of the sealing rod. Under normal circumstances, the bottom surface of the annular boss of the sealing rod seals the first-level exhaust hole on the cylinder sleeve.

8. The double-threaded screw reciprocating air pump according to claim 6, characterized in that: A mounting hole is provided on the first-level air inlet hole of the pump cover, and the air filter is mounted in the mounting hole.

Images