A crankshaft assembly and a micro-piston compressor having the same

Abstract

This utility model discloses a crankshaft assembly and a miniature piston compressor having the crankshaft assembly. The crankshaft assembly includes an output shaft and an offset shaft fixedly connected. The axis of the offset shaft is horizontally offset from the axis of the output shaft. The outer diameter surface of the offset shaft protrudes from the outer diameter surface of the output shaft. A main bearing is fitted on the offset shaft. An eccentric sleeve is fitted on the main bearing. The eccentric sleeve has a first bushing and a second bushing. The first bushing has a first inner ring and a first outer ring. The second bushing has a second inner ring and a second outer ring. The axes of the first inner ring and the first outer ring are horizontally offset, and the axes of the second inner ring and the second outer ring are coaxially arranged. The axes of the first inner ring and the second inner ring are located between the axes of the first outer ring and the second outer ring. Both the first outer ring and the second outer ring are fitted with auxiliary bearings. This technology effectively alleviates the problem of increased volume in compressors with multiple cylinders.

Description

Technical Field

[0001] This utility model relates to the field of air compressor technology, specifically to a crankshaft assembly and a miniature piston compressor having the crankshaft assembly. Background Technology

[0002] In traditional reciprocating compressors, a rotary cam mechanism is typically used to drive the piston to reciprocate longitudinally. However, in the field of air compression technology, there are high requirements for the size of the compressor. Most existing air compressors use a double-piston cylinder in conjunction with a rotary motor to achieve the compression function. With the continuous improvement of application requirements and the development of industry technology, the market's requirements for air compression efficiency are also increasing.

[0003] Chinese utility model patent (authorization announcement number: CN223104716U) discloses a piston compressor for home oxygen concentrators. By opening and closing the valve core, and coordinating the connection of the outlet connection hole and the inlet connection hole in different valve plates with the upper or lower horizontal air passage, the piston compressor can form a mode in which all four cylinders are in positive pressure. It is suitable for use in the PSA system of oxygen concentrators. However, in order to achieve higher compression efficiency, the above-mentioned piston compressor has four cylinders, which requires four crank mechanisms to be installed on the rotating shaft. This results in a significant increase in the overall size of the compressor. This structure restricts the miniaturization design of integrated equipment such as oxygen concentrators and makes it difficult to meet the current application requirements for compact and efficient compression power. Summary of the Invention

[0004] To overcome the shortcomings mentioned above, this utility model aims to provide a crankshaft assembly and a miniature piston compressor having the crankshaft assembly, which can solve the problem that the overall size of the compressor is significantly increased when four sets of cylinders are set, thus restricting the miniaturization design of integrated equipment such as oxygen generators.

[0005] A crankshaft assembly includes an output shaft and an offset shaft, which are fixedly connected. The axis of the offset shaft is horizontally offset from the axis of the output shaft. The outer diameter surface of the offset shaft protrudes from the outer diameter surface of the output shaft. A main bearing is sleeved on the offset shaft. An eccentric sleeve is sleeved on the main bearing. A first bushing and a second bushing are connected front and rear to each other on the eccentric sleeve. The first bushing has a first inner ring and a first outer ring. The second bushing has a second inner ring and a second outer ring. The axis of the first inner ring is horizontally offset from the axis of the first outer ring. The axis of the second inner ring is horizontally offset from the axis of the second outer ring. The first inner ring and the second inner ring are coaxially arranged. The axes of the first inner ring and the second inner ring are located between the axes of the first outer ring and the second outer ring. A secondary bearing is sleeved on both the first outer ring and the second outer ring.

[0006] As a further embodiment of this utility model: the crankshaft assembly also includes a connecting shaft, which is located on the same axis as the output shaft. The axis is provided with a first axis, the rear end of the connecting shaft is provided with a first step block, the front end of the offset shaft is provided with a second step block, the rear end of the offset shaft is provided with a third step block, and the front end of the output shaft is provided with a fourth step block. When the first step block abuts against the second step block and the third step block abuts against the fourth step block, the axis of the offset shaft is horizontally offset from the first axis.

[0007] As a further embodiment of this utility model: the crankshaft assembly also includes a first coupling sleeve, a first screw, a second screw, a second coupling sleeve, a third screw, and a fourth screw. The first coupling sleeve has a second sleeve hole for fitting the first stepped block and the second stepped block. The upper end face of the first coupling sleeve has a first through hole, which connects to the second sleeve hole and extends to the lower end face of the first coupling sleeve. The first stepped block has a first threaded hole on its surface near the first through hole, and the second stepped block has a second threaded hole on its surface near the first through hole. The threaded portion of the first screw passes through the first through hole at the upper end of the first coupling sleeve and is threadedly connected to the first threaded hole, so that the head of the first screw abuts against the upper end face of the first coupling sleeve. The threaded portion of the second screw passes through the first through hole at the lower end of the first coupling sleeve and is threadedly connected to the second threaded hole, so that the head of the second screw abuts against the lower end face of the first coupling sleeve. The second coupling sleeve has a third sleeve hole for fitting the third and fourth stepped blocks. The upper end face of the second coupling sleeve has a second through hole, which connects to the third sleeve hole and extends to the lower end face of the second coupling sleeve. The third stepped block has a third threaded hole on its surface near the second through hole, and the fourth stepped block has a fourth threaded hole on its surface near the second through hole. The threaded part of the third screw passes through the second through hole at the upper end of the second coupling sleeve and is threadedly connected to the third screw hole, so that the head of the third screw abuts against the upper end face of the second coupling sleeve. The threaded part of the fourth screw passes through the second through hole at the lower end of the second coupling sleeve and is threadedly connected to the fourth screw hole, so that the head of the fourth screw abuts against the lower end face of the second coupling sleeve.

[0008] As a further embodiment of this utility model: a miniature piston compressor including the above-mentioned crankshaft assembly, further comprising: a hollow main body, at least two connecting rods and at least four cylinders, a rotating motor disposed on the rear end face of the main body, the crankshaft assembly disposed inside the main body, a first connecting hole provided on the rear end face of the main body for insertion of the output shaft, the two connecting rods having first sleeve holes for respectively sleeved on the outer cylindrical surface of the auxiliary bearing, pistons provided at both ends of the connecting rods, insertion holes provided on the upper and lower end faces and left and right end faces of the main body, the four cylinders each being inserted into the insertion hole, and a guide cylinder provided on the end face of the cylinder near the piston for insertion of the piston, the piston and the bottom of the guide cylinder forming a compression space for compressing gas; The main body is provided with a first intake pipe and a first exhaust pipe. The main body has an intake port on one end face near the first intake pipe and an exhaust port on one end face near the first exhaust pipe. The cylinder is provided with a second intake pipe and a second exhaust pipe. The first intake pipe is connected to the second intake pipe, and the second intake pipe is connected to the guide cylinder. The cylinder is provided with a first valve, which is located at the connection between the second intake pipe and the guide cylinder, so that gas can only be transported unidirectionally from the second intake pipe to the guide cylinder. The second exhaust pipe is connected to the guide cylinder and the first exhaust pipe. The cylinder is provided with a second valve, which is located at the connection between the second exhaust pipe and the guide cylinder, so that gas can only be transported unidirectionally from the guide cylinder to the second exhaust pipe.

[0009] As a further embodiment of this utility model: the crankshaft assembly also includes a first bearing, and a second mounting hole is provided on the front end face of the main body. The first bearing is installed in the second mounting hole, and the front end of the connecting shaft is inserted into the inner hole of the first bearing. When the rotating motor drives the output shaft to rotate, the connecting shaft rotates coaxially with the output shaft, and the output shaft drives the offset shaft to revolve around the first axis.

[0010] As a further embodiment of this utility model: the main body includes a first mounting base and a second mounting base. The left and right sides of the first mounting base extend forward to form two first side plates, and the upper and lower sides of the second mounting base extend backward to form two second side plates. The first mounting base and the second mounting base are inserted into each other to form a hollow box. A first connecting hole is opened on the rear end face of the first mounting base, and insertion holes are opened on the end faces of the first side plate and the second side plate for inserting the cylinder.

[0011] As a further embodiment of this utility model: the upper side of the first mounting base has two downwardly extending third through holes, which are located on the left and right sides of the first connecting hole, respectively. The left side of the first mounting base has two rightward extending fourth through holes, which are located on the upper and lower sides of the first connecting hole, respectively. The third through holes and the fourth through holes are interconnected to form a first air intake pipe. The first mounting base is provided with at least seven first sealing plugs to block the openings of the third through holes and the fourth through holes, so that the first air intake pipe has only one opening for use as an air intake.

[0012] As a further embodiment of this utility model: the first mounting base is provided with first air guide holes on the upper, lower and left and right sides near the first air intake pipe. The first air guide holes are connected to the first air intake pipe to transmit the gas of the first air intake pipe to the second air intake pipe of the cylinder.

[0013] As a further embodiment of this utility model: the upper side of the second mounting base has two downwardly extending fifth through holes, which are located on the left and right sides of the second connecting hole respectively. The left side of the second mounting base has two rightward extending sixth through holes, which are located on the upper and lower sides of the second connecting hole respectively. The fifth through holes and the sixth through holes are interconnected to form a first air outlet pipe. The second mounting base is provided with at least seven second sealing plugs to block the openings of the fifth through holes and the sixth through holes respectively, so that the first air outlet pipe has only one opening for use as an air outlet.

[0014] As a further embodiment of this utility model: the second mounting base is provided with second air guide holes on the upper, lower and left and right sides near the first air outlet pipe. The second air guide holes are connected to the first air outlet pipe to transmit the gas from the second air outlet pipe to the first air outlet pipe.

[0015] Compared with the prior art, the beneficial effects of this utility model are: by setting a piston at the end of the connecting rod, the eccentric rotation of the crankshaft assembly can be converted into the linear reciprocating motion of the connecting rod. The connecting rod makes linear reciprocating motion in the up and down and left and right directions, causing the piston at the end of the connecting rod to compress the gas in the guide cylinder. One connecting rod can drive two pistons at the same time, which effectively alleviates the problem of increased volume of the compressor when multiple sets of cylinders are set, and is more suitable for the miniaturization design of integrated equipment. Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the micro piston compressor structure in this utility model.

[0018] Figure 2 This is a schematic diagram of another structure of the micro piston compressor in this utility model.

[0019] Figure 3 yes Figure 2 A cross-sectional view of section AA.

[0020] Figure 4 yes Figure 3 A magnified view of a portion of point B in the middle.

[0021] Figure 5 This is a structural schematic diagram of the connecting rod and eccentric assembly in this utility model.

[0022] Figure 6 This is a partial schematic diagram of the offset axis and the connecting axis in this utility model.

[0023] Figure 7 This is a schematic diagram of the eccentric sleeve in this utility model.

[0024] Figure 8 This is a schematic diagram of the axial section of the eccentric sleeve in this utility model.

[0025] Figure 9 This is a longitudinal axial sectional view of the eccentric component in this utility model.

[0026] Figure 10 This is a transverse axial section view of the eccentric component in this utility model.

[0027] Figure 11 This is a top view of the eccentric component in this utility model, partially cut along the transverse direction.

[0028] Figure 12 This is a side view of the eccentric component in this utility model.

[0029] Figure 13 This is an isometric sectional view of the first mounting base in this utility model.

[0030] Figure 14 This is a schematic diagram of the structure of the first mounting base in this utility model.

[0031] Figure 15 This is an isometric sectional view of the second mounting base in this utility model.

[0032] Figure 16 This is a schematic diagram of the main body of the present invention.

[0033] Figure 17 This is an isometric sectional view of the cylinder barrel in this utility model.

[0034] Figure 18 This is a bottom view of the cylinder in this utility model.

[0035] Figure 19 yes Figure 18 A cross-sectional view of the CC section.

[0036] In the diagram: 1. Rotary motor; 11. Output shaft; 111. Fourth step block; 1111. Fourth threaded hole; 12. First air inlet pipe; 13. First air outlet pipe; 14. Air inlet; 15. Air outlet; 21. Connecting shaft; 211. First stepped block; 2111. First threaded hole; 22. Offset shaft; 221. Second stepped block; 2211. Second threaded hole; 222. Third stepped block; 2221. Third threaded hole; 23. Main bearing; 24. Eccentric sleeve; 241. First bushing; 2411. First inner ring sleeve; 2412. First outer ring sleeve; 242. Second bushing; 2421. Second inner ring sleeve; 2422. Second outer ring sleeve; 25. Secondary bearing; 26. First bearing; 27. First coupling sleeve; 271. First screw; 272. Second screw; 273. Second sleeve hole; 274. First through hole; 28. Second coupling sleeve; 281. Third screw; 282. Fourth screw; 283. Third sleeve hole; 284. Second through hole; 3. Main body; 32. First mounting base; 321. First side plate; 322. First connecting hole; 323. Third through hole; 324. Fourth through hole; 325. First sealing plug; 326. First vent hole; 33. Second mounting base; 331. Second side plate; 332. Second connecting hole; 333. Fifth through hole; 334. Sixth through hole; 335. Second sealing plug; 336. Second vent hole; 311. Insertion hole; 4. Connecting rod; 41. First bushing; 42. Piston; 5. Cylinder; 51. Guide cylinder; 52. Second intake pipe; 53. Second exhaust pipe; 54. First valve; 55. Second valve; 521. First intake port; 531. First exhaust port; 99. Compression space; 98. First shaft.

[0037] Detailed implementation method.

[0038] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0039] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0041] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0042] Please see Figures 1-5 In this embodiment of the invention, the micro piston compressor includes a rotary motor 1, a crankshaft assembly, a hollow main body 3, at least two connecting rods 4, and at least four cylinders 5. The rotary motor 1 is located on the rear end face of the main body 3, and a first connecting hole 322 is provided on the rear end face of the main body 3 for inserting the output shaft 11 of the rotary motor 1. The crankshaft assembly is located inside the main body 3, and the output shaft 11 of the rotary motor 1 is connected to the crankshaft assembly to drive the crankshaft assembly to rotate. The connecting rods 4 have a first sleeve hole 41 for sleeved onto the crankshaft assembly, and both ends of the connecting rods 4 are provided with... Piston 42, the upper and lower end faces and the left and right end faces of the main body 3 are respectively provided with insertion holes 311, and four cylinders 5 are each inserted into the insertion holes 311. The cylinder 5 is provided with a guide cylinder 51 on the end face near piston 42 for piston 42 to be inserted. The guide cylinder 51 restricts the position of piston 42, so that piston 42 can only move within the guide cylinder 51. The bottom of piston 42 and guide cylinder 51 form a compression space 99 for compressing gas. When the crankshaft assembly rotates, the crankshaft assembly drives one connecting rod 4 to move longitudinally reciprocatingly, and the crankshaft assembly drives another connecting rod 4 to move left and right reciprocatingly.

[0043] Specifically, the first set of holes 41 is located in the middle of the connecting rod 4. When the crankshaft assembly makes an eccentric motion, the connecting rod 4, which is sleeved on the crankshaft assembly, moves reciprocally in the longitudinal direction or reciprocates in the left and right direction. The pistons 42 at each end of the connecting rod 4 have the same stroke. By arranging the four cylinders 5 radially in a cross shape in the same main body 3 and using a single crankshaft assembly to drive all the pistons 42, the ultimate integrated design of sharing one motor and one crankshaft for the four cylinders 5 is realized. This design is suitable for portable devices with strict space requirements (such as medical oxygen concentrators).

[0044] Further as Figures 3-6 As shown in the embodiment of this utility model, the crankshaft assembly includes a connecting shaft 21, an offset shaft 22, two main bearings 23, an eccentric sleeve 24, a first bearing 26, and two auxiliary bearings 25. (Refer to...) Figure 1 The front end face of the main body 3 is provided with a second connecting hole 332. The first bearing 26 is installed in the second connecting hole 332. The front end of the connecting shaft 21 is inserted into the inner hole of the first bearing 26. The connecting shaft 21 and the output shaft 11 are located on the same axis, which is set as the first axis 98. The rear end of the connecting shaft 21 is provided with a first step block 211. The front end of the offset shaft 22 is provided with a second step block 221. The rear end of the offset shaft 22 is provided with a third step block 222. The front end of the output shaft 11 is provided with a fourth step block 111. The step surface of the first step block 211 is connected to the step surface of the second step block 221. The step surface of the third step block 222 is connected to the step surface of the fourth step block 111, so that the axis of the offset shaft 22 is horizontally offset from the first axis 98. When the rotating motor 1 drives the output shaft 11 to rotate, the output shaft 11 drives the offset shaft 22 to rotate eccentrically about the first axis 98. The crankshaft assembly is connected in a segmented structure, which facilitates machining and forming. The connecting shaft 21, offset shaft 22 and output shaft 11 can be machined and formed by CNC lathe and milling machine. On the other hand, the segmented structure makes it easy to replace severely worn parts in a timely manner. For example, when the offset shaft 22 is severely worn after long-term use, it can be replaced with a new offset shaft 22 in a timely manner.

[0045] Further as Figures 5-12 As shown, the eccentric sleeve 24 is provided with a first bushing 241 and a second bushing 242. The front end face of the first bushing 241 is fixedly connected to the rear end face of the second bushing 242. The first bushing 241 is provided with a first inner ring sleeve 2411 and a first outer ring sleeve 2412. (Refer to...) Figure 7-8 The second bushing 242 is provided with a second inner ring 2421 and a second outer ring 2422. The first inner ring 2411 and the second inner ring 2421 are located on the same axis. The axis of the first inner ring 2411 is horizontally offset from the axis of the first outer ring 2412, and the axis of the second inner ring 2421 is horizontally offset from the axis of the second outer ring 2422. The first inner ring 2411 and the second inner ring 2421 are coaxially arranged. The axis of 21 is located between the axis of the first outer ring sleeve 2412 and the axis of the second outer ring sleeve 2422. The first inner ring sleeve 2411 and the second inner ring sleeve 2421 are both equipped with main bearings 23. The offset shaft 22 passes through the inner hole of the main bearing 23, so that the eccentric sleeve 24 is fitted on the offset shaft 22. The first outer ring sleeve 2412 and the second outer ring sleeve 2422 are each fitted with a secondary bearing 25. The first sleeve hole 41 of the two connecting rods 4 is respectively fitted on the outer circular surface of the secondary bearing 25.

[0046] Specifically, the first step block 211 and the second step block 221 can be connected by a coupling to achieve synchronous rotation of the output shaft 11 and the offset shaft 22. The coupling types include, but are not limited to, diaphragm couplings, lapel couplings, and gear couplings. Similarly, the third step block 222 and the fourth step block 111 can be connected in the same way as the first step block 211 and the second step block 221. When the output shaft 11 of the rotary motor 1 rotates, it can drive the offset shaft 22 and the connecting shaft 21 to rotate synchronously. (Reference) Figures 7-12 The axis between the first bushing 241 and the second bushing 242 is horizontally offset, causing the eccentric bushing 24 to undergo a compound motion under the eccentric rotation of the offset shaft 22 when the offset shaft 22 rotates eccentrically. This compound motion can be decomposed into longitudinal and transverse components, which are transmitted to the corresponding pistons 42 through the two connecting rods 4, driving them to perform linear reciprocating motion. The first bushing 241 and the second bushing 242 can be integrally machined by CNC machining.

[0047] See attached document Figures 3-4 In this embodiment of the present invention, the connection between the first step block 211 and the second step block 221 can refer to the following scheme: The crankshaft assembly also includes a first coupling sleeve 27, a first screw 271, a second screw 272, a second coupling sleeve 28, a third screw 281, and a fourth screw 282. The first coupling sleeve 27 has a second sleeve hole 273 for fitting the first step block 211 and the second step block 221. The upper end face of the first coupling sleeve 27 has a first through hole 274. The first through hole 274 connects to the second sleeve hole 273 and extends to the lower end face of the first coupling sleeve 27. The first step block 211 has a [missing information - likely a surface feature] on its surface near the first through hole 274. The first threaded hole 2111 and the second stepped block 221 have a second threaded hole 2211 on their surface near the first through hole 274. The threaded part of the first screw 271 passes through the first through hole 274 at the upper end of the first coupling sleeve 27 and is threadedly connected to the first threaded hole 2111, so that the head of the first screw 271 abuts against the upper end face of the first coupling sleeve 27. The threaded part of the second screw 272 passes through the first through hole 274 at the lower end of the first coupling sleeve 27 and is threadedly connected to the second threaded hole 2211, so that the head of the second screw 272 abuts against the lower end face of the first coupling sleeve 27, thereby completing the locking and fixing between the first stepped block 211 and the second stepped block 221.

[0048] The connection between the third step block 222 and the fourth step block 111 can refer to the following scheme: The second coupling sleeve 28 has a third sleeve hole 283 for fitting the third step block 222 and the fourth step block 111. The upper end face of the second coupling sleeve 28 has a second through hole 284, which connects to the third sleeve hole 283 and extends to the lower end face of the second coupling sleeve 28. The third step block 222 has a third threaded hole 2221 on the surface near the second through hole 284. The fourth step block 111 has a threaded hole on the surface near the second through hole 284. There is a fourth threaded hole 1111. The threaded part of the third screw 281 passes through the second through hole 284 at the upper end of the second coupling sleeve 28 and is threadedly connected to the hole of the third screw 281, so that the head of the third screw 281 abuts against the upper end face of the second coupling sleeve 28. The threaded part of the fourth screw 282 passes through the second through hole 284 at the lower end of the second coupling sleeve 28 and is threadedly connected to the hole of the fourth screw 282, so that the head of the fourth screw 282 abuts against the lower end face of the second coupling sleeve 28, thereby completing the locking and fixing between the third step block 222 and the fourth step block 111.

[0049] Further as Figures 2-3 As shown in the embodiment of this utility model, the main body 3 is provided with a first air intake pipe 12 and a first air outlet pipe 13. An air inlet 14 is provided on one end face of the main body 3 near the first air intake pipe 12, and an air outlet 15 is provided on one end face of the main body 3 near the first air outlet pipe 13. A second air intake pipe 52 and a second air outlet pipe 53 are provided inside the cylinder 5. The first air intake pipe 12 is connected to the second air intake pipe 52, and the second air intake pipe 52 is connected to the guide cylinder 51. Further refer to the attached drawing. Figures 17-19 The cylinder 5 is equipped with a first valve 54, which is located at the connection between the second intake pipe 52 and the guide cylinder 51, allowing gas to be transported unidirectionally from the second intake pipe to the guide cylinder 51, thus preventing gas backflow. The second outlet pipe 53 connects to the guide cylinder 51 and the first outlet pipe 13. The cylinder 5 is also equipped with a second valve 55, which is located at the connection between the second outlet pipe 53 and the guide cylinder 51, allowing gas to be transported unidirectionally from the guide cylinder 51 to the second outlet pipe 53. The first valve 54 and the second valve 55 can be wafer check valves.

[0050] Further as Figures 13-16As shown in the embodiment of this utility model, the main body 3 includes a first mounting base 32 and a second mounting base 33. The left and right sides of the first mounting base 32 extend forward to form two first side plates 321, and the upper and lower sides of the second mounting base 33 extend backward to form two second side plates 331. The first mounting base 32 and the second mounting base 33 are inserted into each other to form a hollow box. The rear end face of the first mounting base 32 is provided with a first connecting hole 322. The end faces of the first side plate 321 and the second side plate 331 are provided with insertion holes 311 for the insertion of the cylinder 5. The main body 3 is formed by inserting the first mounting base 32 and the second mounting base 33. This split structure greatly simplifies the processing difficulty of the complex internal air passages (first intake pipe 12 and first exhaust pipe 13) and facilitates the installation and maintenance of the crankshaft assembly and the cylinder 5.

[0051] Specifically, the first side plate 321 and the second side plate 331 are interleaved so that the first side plate 321 abuts against the rear end face of the second mounting base 33. The first side plate 321 can be fixed to the rear end face of the second mounting base 33 by threading holes corresponding to the end faces of the first side plate 321 that contact the second mounting base 33 through threaded connection. Similarly, when the second side plate 331 abuts against the front end of the first mounting base 32, the connection between the second side plate 331 and the first mounting base 32 can also refer to the connection method between the first side plate 321 and the second mounting base 33 bracket described above.

[0052] Further as Figures 13-14 As shown in this embodiment of the present invention, the upper side of the first mounting base 32 has two downwardly extending third through holes 323, which are located on the left and right sides of the first connecting hole 322, respectively. The left side of the first mounting base 32 has two rightward extending fourth through holes 324, which are located on the upper and lower sides of the first connecting hole 322, respectively. The third through holes 323 and the fourth through holes 324 are interconnected to form a square first air intake pipe 12. The first connecting hole 322 is surrounded by the first air intake pipe 12. Because the third through holes 323 and the fourth through holes 324 are connected... The interconnection allows the first air intake pipe 12 to have eight through holes. The first mounting base 32 is provided with at least seven first sealing plugs 325 to block the through holes of the first air intake pipe 12 (i.e., the holes of the third through hole 323 and the fourth through hole 324), so that the first air intake pipe 12 has only one hole for use as the air inlet 14. The aforementioned third through hole 323 and fourth through hole 324 can be processed by drilling. Then, the excess holes are blocked by sealing plugs. The air inlet 14 can be flexibly defined according to the actual site conditions, which can adapt to the layout requirements of different complete machines (such as oxygen concentrators).

[0053] Further as Figures 13-14As shown in the embodiment of this utility model, the first mounting base 32 is provided with first air guide holes 326 on the upper, lower and left and right sides near the first air intake pipe 12. One end of the first air guide hole 326 is connected to the first air intake pipe 12, and the other end of the first air guide hole 326 is connected to the second air intake pipe 52 for transmitting the gas from the first air intake pipe 12 to the second air intake pipe 52 of the cylinder 5. Specifically, the bottom of the cylinder 5 is provided with a guide cylinder 51, making the cylinder 5 as a stepped protrusion structure. When the guide cylinder 51 is inserted from the insertion hole 311 of the side plate, the bottom surfaces of the four cylinders 5 abut against the upper and lower and left and right sides of the first mounting base 32, so that the first air guide hole 326 abuts against the bottom surface of the cylinder 5. The second air intake pipe 52 inside the cylinder 5 extends from the bottom surface of the cylinder 5 near the first air guide hole 326 to form the first air intake hole 521. The first air intake hole 521 is used to communicate with the first air guide hole 326 so that the gas in the first air intake pipe 12 can be transmitted to the first air intake pipe 12. The first air guide hole 326 has an annular groove (not shown in the figure) on its flat surface (i.e., the side surface of the first mounting base 32) to surround the first air guide hole 326. A sealing rubber ring (not shown in the figure) is placed in the annular groove so that when the bottom surface of the cylinder 5 abuts against the upper and lower and left and right sides of the first mounting base 32, the sealing performance can be enhanced to prevent gas leakage during transmission. Similarly, the opening of the first air inlet hole 521 can also refer to the above-mentioned technical solution of opening an annular groove in the first air guide hole 326 to place the sealing rubber ring.

[0054] Further as Figures 15-16 As shown in the embodiment of this utility model, the upper side of the second mounting base 33 has two downwardly extending fifth through holes 333, which are located on the left and right sides of the second connecting hole 332, respectively. The left side of the second mounting base 33 has two rightward extending sixth through holes 334, which are located on the upper and lower sides of the second connecting hole 332, respectively. The fifth through holes 333 and the sixth through holes 334 are interconnected to form a first air outlet pipe 13. The second connecting hole 332 is surrounded by the first air outlet pipe 13. Since the fifth through holes 333 and the sixth through holes 334 are interconnected, the first air outlet pipe 13 has eight through hole openings. The second mounting base 33 is provided with at least seven second sealing plugs 335 to block the openings of the through holes of the first air outlet pipe 13 (that is, the openings of the fifth through holes 333 and the sixth through holes 334), so that the first air outlet pipe 13 has only one opening for use as an air outlet 15. The aforementioned fifth through hole 333 and sixth through hole 334 can be formed by drilling. Then, the excess holes can be sealed with sealing plugs. The air outlet 15 can be flexibly defined according to the actual site conditions, which can adapt to the layout requirements of different complete machines (such as oxygen generators).

[0055] Further as Figures 15-16As shown in this embodiment of the present invention, the second mounting base 33 has second air guide holes 336 on its upper, lower, left, and right sides near the first air outlet pipe 13. One end of the second air guide hole 336 is connected to the first air outlet pipe 13, and the other end is connected to the second air outlet pipe 53, for transmitting the gas from the second air outlet pipe 53 to the first air outlet pipe 13. When the guide cylinders 51 of the four cylinders 5 are inserted into the insertion holes 311, the bottom surfaces of the four cylinders 5 abut against the upper, lower, left, and right sides of the second mounting base 33, so that the openings of the second air guide holes 336 abut against the bottom surface of the cylinders 5. The second air outlet pipe 53 inside the cylinders 5 extends out from the bottom surface of the cylinders 5 near the second air guide holes 336 to form a first air outlet hole 531. The first air outlet hole 531 is used to connect with the second air guide hole 336 so that the gas from the second air outlet pipe 53 can be transmitted to the first air outlet pipe 13. Similarly, the first vent 531 or the second vent 336 can be fitted with an annular groove to accommodate a sealing rubber ring, similar to the first vent 326 described above. This enhances the sealing performance of the gas during transmission and prevents gas leakage.

[0056] The working principle of this utility model is as follows: 1. Intake stage: The rotating motor 1 drives the crankshaft assembly to rotate, which drives the two sets of four pistons 42 to move away from the bottom of the guide cylinder 51. The volume of the compression space 99 increases and the internal pressure decreases. At this time, the first valve 54 (intake one-way valve) opens under the action of pressure difference. External air is sucked into the compression space 99 in sequence through the intake port 14, the first intake pipe 12, the first air guide hole 326, and the second intake pipe 52.

[0057] 2. Compression and exhaust stage: The crankshaft assembly continues to rotate, pushing all pistons 42 to move towards the bottom of the guide cylinder 51. The volume of the compression space 99 decreases, the gas is compressed, and the pressure increases. When the pressure exceeds the sum of the back pressure of the first exhaust pipe 13 and the pressure of the second valve 55 (exhaust check valve), the second valve 55 opens, and the compressed gas passes through the second exhaust pipe 53, the second air guide hole 336, and the first exhaust pipe 13 in sequence, and is discharged from the exhaust port 15.

[0058] 3. Coordinated operation: The intake and compression strokes of the four cylinders 5 are carried out alternately under the coordination of the crankshaft assembly, so that the compressed gas can be output continuously and smoothly.

[0059] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A crankshaft assembly, characterized in that, The device includes an output shaft (11) and an offset shaft (22), which are fixedly connected to the output shaft (11). The axis of the offset shaft (22) is horizontally offset from the axis of the output shaft (11). The outer diameter surface of the offset shaft (22) protrudes from the outer diameter surface of the output shaft (11). A main bearing (23) is sleeved on the offset shaft (22), and an eccentric sleeve (24) is sleeved on the main bearing (23). The eccentric sleeve (24) has a first bushing (241) and a second bushing (242) connected front and rear. The first bushing (241) has a first inner ring (2411) and a first outer ring (2412), and the second bushing (242) has a second inner ring (2411) and a second outer ring (2412). The inner ring sleeve (2421) and the second outer ring sleeve (2422) are arranged in a coaxial manner. The axis of the first inner ring sleeve (2411) is horizontally offset from the axis of the first outer ring sleeve (2412), and the axis of the second inner ring sleeve (2421) is horizontally offset from the axis of the second outer ring sleeve (2422). The first inner ring sleeve (2411) and the second inner ring sleeve (2421) are coaxially offset. The axis of the first inner ring sleeve (2411) and the second inner ring sleeve (2421) is located between the axis of the first outer ring sleeve (2412) and the axis of the second outer ring sleeve (2422). The first outer ring sleeve (2412) and the second outer ring sleeve (2422) are both fitted with a secondary bearing (25).

2. The crankshaft assembly according to claim 1, characterized in that, The crankshaft assembly also includes a connecting shaft (21), which is located on the same axis as the output shaft (11). The axis is provided with a first axis (98). The rear end of the connecting shaft (21) is provided with a first step block (211), the front end of the offset shaft (22) is provided with a second step block (221), the rear end of the offset shaft (22) is provided with a third step block (222), and the front end of the output shaft (11) is provided with a fourth step block (111). When the first step block (211) abuts against the second step block (221) and the third step block (222) abuts against the fourth step block (111), the axis of the offset shaft (22) is horizontally offset from the first axis.

3. The crankshaft assembly according to claim 2, characterized in that, The crankshaft assembly also includes a first coupling sleeve (27), a first screw (271), a second screw (272), a second coupling sleeve (28), a third screw (281), and a fourth screw (282). The first coupling sleeve (27) has a second sleeve hole (273) for fitting the first stepped block (211) and the second stepped block (221). The upper end face of the first coupling sleeve (27) has a first through hole (274). The first through hole (274) connects to the second sleeve hole (273) and extends to the lower end face of the first coupling sleeve (27). The first stepped block (211) has a first threaded hole on its surface near the first through hole (274). 2111), the second step block (221) has a second threaded hole (2211) on the surface near the first through hole (274). The threaded part of the first screw (271) passes through the first through hole (274) at the upper end of the first coupling sleeve (27) and is threadedly connected to the first threaded hole (2111), so that the head of the first screw (271) abuts against the upper end face of the first coupling sleeve (27). The threaded part of the second screw (272) passes through the first through hole (274) at the lower end of the first coupling sleeve (27) and is threadedly connected to the second threaded hole (2211), so that the head of the second screw (272) abuts against the lower end face of the first coupling sleeve (27). The second coupling sleeve (28) has a third sleeve hole (283) for fitting the third step block (222) and the fourth step block (111). The upper end face of the second coupling sleeve (28) has a second through hole (284), which connects to the third sleeve hole (283) and extends to the lower end face of the second coupling sleeve (28). The third step block (222) has a third threaded hole (2221) on its surface near the second through hole (284). The fourth step block (111) has a threaded hole on its surface near the second through hole (284). There is a fourth threaded hole (1111). The threaded part of the third screw (281) passes through the second through hole (284) at the upper end of the second coupling sleeve (28) and is threadedly connected to the third screw (281) hole, so that the head of the third screw (281) abuts against the upper end face of the second coupling sleeve (28). The threaded part of the fourth screw (282) passes through the second through hole (284) at the lower end of the second coupling sleeve (28) and is threadedly connected to the fourth screw (282) hole, so that the head of the fourth screw (282) abuts against the lower end face of the second coupling sleeve (28).

4. A miniature piston compressor comprising the crankshaft assembly according to any one of claims 1 to 3, characterized in that, Also includes: The main body (3) is hollow inside, with at least two connecting rods (4) and at least four cylinders (5). The rotating motor (1) is located on the rear end face of the main body (3), and the crankshaft assembly is located inside the main body (3). The rear end face of the main body (3) is provided with a first connecting hole (322) for the insertion of the output shaft (11). The two connecting rods (4) are provided with a first sleeve hole (41) for respectively sleeved on the outer circular surface of the auxiliary bearing (25). Both ends of the connecting rods (4) are provided with pistons (42). The upper and lower end faces and the left and right end faces of the main body (3) are respectively provided with insertion holes (311). The four cylinders (5) are each inserted into the insertion holes (311). The cylinder (5) is provided with a guide cylinder (51) on the end face near the piston (42) for the insertion of the piston (42). The bottom of the piston (42) and the guide cylinder (51) form a compression space (99) for squeezing gas. The main body (3) is provided with a first intake pipe (12) and a first exhaust pipe (13). The main body (3) has an intake port (14) on one end face near the first intake pipe (12) and an exhaust port (15) on one end face near the first exhaust pipe (13). The cylinder (5) is provided with a second intake pipe (52) and a second exhaust pipe (53). The first intake pipe (12) is connected to the second intake pipe (52). The second intake pipe (52) is connected to the guide cylinder (51). The cylinder (5) is provided with a first valve (54). The first valve (54) is located at the connection between the second intake pipe (52) and the guide cylinder (51) so that gas can only be transported unidirectionally from the second intake pipe to the guide cylinder (51). The second exhaust pipe (53) is connected to the guide cylinder (51) and the second exhaust pipe (53) is connected to the first exhaust pipe (13). The cylinder (5) is provided with a second valve (55), which is located at the connection between the second exhaust pipe (53) and the guide cylinder (51) so that gas can only be transported unidirectionally from the guide cylinder (51) to the second exhaust pipe (53).

5. The miniature piston compressor according to claim 4, characterized in that, The crankshaft assembly also includes a first bearing (26). A second mounting hole is provided on the front end face of the main body (3). The first bearing (26) is installed in the second mounting hole. The front end of the connecting shaft (21) is inserted into the inner hole of the first bearing (26). When the rotating motor (1) drives the output shaft (11) to rotate, the connecting shaft (21) and the output shaft (11) rotate coaxially. The output shaft (11) drives the offset shaft (22) to revolve around the first axis.

6. The miniature piston compressor according to claim 4, characterized in that, The main body (3) includes a first mounting base (32) and a second mounting base (33). The left and right sides of the first mounting base (32) extend forward to form two first side plates (321), and the upper and lower sides of the second mounting base (33) extend backward to form two second side plates (331). The first mounting base (32) and the second mounting base (33) are inserted into each other to form a hollow box. The rear end face of the first mounting base (32) is provided with a first connecting hole (322). The end faces of the first side plate (321) and the second side plate (331) are provided with insertion holes (311) for the insertion of the cylinder (5).

7. The miniature piston compressor according to claim 6, characterized in that, The upper side of the first mounting base (32) has two downwardly extending third through holes (323), which are located on the left and right sides of the first connecting hole (322). The left side of the first mounting base (32) has two rightward extending fourth through holes (324), which are located on the upper and lower sides of the first connecting hole (322). The third through holes (323) and the fourth through holes (324) are interconnected to form the first air intake pipe (12). The first mounting base (32) is provided with at least seven first sealing plugs (325) to block the openings of the third through holes (323) and the fourth through holes (324) respectively, so that the first air intake pipe (12) has only one opening for use as an air intake (14).

8. The miniature piston compressor according to claim 6, characterized in that, The first mounting base (32) has a first air guide hole (326) on the upper, lower and left and right sides near the first air intake pipe (12). The first air guide hole (326) is connected to the first air intake pipe (12) to transmit the gas of the first air intake pipe (12) to the second air intake pipe (52) of the cylinder (5).

9. The miniature piston compressor according to claim 6, characterized in that, The upper side of the second mounting base (33) has two downwardly extending fifth through holes (333), which are located on the left and right sides of the second connecting hole (332). The left side of the second mounting base (33) has two rightward extending sixth through holes (334), which are located on the upper and lower sides of the second connecting hole (332). The fifth through holes (333) and the sixth through holes (334) are interconnected to form the first air outlet pipe (13). The second mounting base (33) is provided with at least seven second sealing plugs (335) to block the openings of the fifth through holes (333) and the sixth through holes (334) respectively, so that the first air outlet pipe (13) has only one opening for use as an air outlet (15).

10. The miniature piston compressor according to claim 9, characterized in that, The second mounting base (33) has second air guide holes (336) on the upper, lower and left and right sides near the first air outlet pipe (13). The second air guide holes (336) are connected to the first air outlet pipe (13) to transmit the gas from the second air outlet pipe (53) to the first air outlet pipe (13).

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