Double-loop differential pressure oil pumping compressor

Abstract

The invention provides a double-loop differential pressure pump oil compressor. The double-loop differential pressure pump oil compressor comprises a shell, a first partition plate, an oil separator and a compression assembly. A sealing cavity is formed in the shell; the first partition plate divides the sealing cavity into a low-pressure cavity and a high-pressure cavity, and an exhaust noise reduction cavity is formed in the high-pressure cavity. The compression assembly comprises a motor, a crankshaft and at least one stage of compression unit; the compression unit comprises a cylinder body and a rotary piston, an air suction cavity and a compression cavity are arranged between the cylinder body and the corresponding rotary piston, a first oil suction channel is arranged between the air suction cavity and the low-pressure cavity, the compression cavity is communicated with the oil separator, and an oil return channel is arranged between the exhaust silencing cavity and the high-pressure cavity; oil passing channels are arranged on the crankshaft at intervals, a center hole is formed in the crankshaft, and a second oil suction channel is arranged between the high-pressure cavity and the oil passing channels. The defects that an existing rotary compressor depends on high-speed rotation of a crankshaft to drive an oil pump, oil supply is insufficient under the conditions of low rotating speed, low oil level and gravity change, and the lubricating effect and operation efficiency are affected are overcome.

Description

Technical Field

[0001] The invention relates to the technical field of compressors, and in particular to a double-circuit pressure difference pump oil compressor. Background Art

[0002] In existing rotary compressors, a spiral oil pump blade is usually set in the inner hole at one end of the crankshaft, and the rotation of the crankshaft drives the oil pump blade to rotate, thereby realizing the flow of refrigeration oil; or a spiral pump body is set in the inner hole of the crankshaft, and the pump body and the inner hole of the crankshaft form a lubricating oil pump through the cooperation of the pump body and the inner hole of the crankshaft to supply lubrication and sealing clearance to each friction pair of the compressor. However, the oil supply driving force of the oil pump of the existing rotary compressor mainly depends on the high-speed rotation of the crankshaft, resulting in a small pressure difference of the oil pump, poor self-priming ability, and a problem of insufficient oil supply at low speed and low oil level.

[0003] Especially in some special scenarios, such as when the installation posture of a horizontal rotary compressor is changeable or it is used in a microgravity environment (such as cars, airplanes, high-speed trains, tanks, ships, flying cars, aerospace vehicles, satellites, space stations, and extraterrestrial space bases, etc.), due to changes in the oil level in the compressor or changes in gravitational acceleration, traditional oil pumps using gravity, centrifugal force, capillary force, etc. cannot effectively ensure reliable lubrication between moving parts and efficient oil sealing of the fitting clearance, affecting the service life and operating efficiency of the compressor. Summary of the invention

[0004] The present invention provides a dual-circuit differential pressure pump oil compressor, which is used to solve the defect that the existing rotary compressor relies on the high-speed rotation of the crankshaft to drive the oil pump, resulting in insufficient oil supply under low speed, low oil level and gravity changes, affecting the lubrication effect and operating efficiency.

[0005] The invention provides a double-circuit pressure difference pump oil compressor, comprising: a shell, a first partition plate, an oil separator and a compression component.

[0006] A sealed cavity is formed in the shell; the first partition is located in the sealed cavity and divides the sealed cavity into a low-pressure cavity and a high-pressure cavity, and an exhaust muffler cavity is provided in the high-pressure cavity; the oil separator is located in the exhaust muffler cavity; the compression assembly includes a motor, a crankshaft and at least one compression unit, both ends of the crankshaft are rotatably matched with the shell, and the motor is drivingly connected to the crankshaft.

[0007] The compression unit includes a cylinder body and a rotary piston, the rotary piston is arranged on the crankshaft, an air suction chamber and a compression chamber are arranged between the cylinder body and the corresponding rotary piston, the air suction chamber is communicated with the corresponding compression chamber, a first oil suction passage is arranged between the air suction chamber and the low-pressure chamber, the compression chamber is communicated with the oil separator, and an oil return passage is arranged between the exhaust muffler chamber and the high-pressure chamber.

[0008] The crankshaft is provided with oil passageways corresponding to the compression units one by one at intervals. A central hole is provided in the crankshaft. The oil passageways are communicated with the first end of the central hole. The second end of the central hole is communicated with the rotational mating part of the crankshaft and the housing and the low-pressure cavity in sequence. A second oil suction passage is provided between the high-pressure cavity and the oil passageways.

[0009] In the double-loop differential-pressure oil pump compressor provided by the present invention, the compression assembly includes multiple stages of the compression units connected in series in sequence. The compression cavity of the previous-stage compression unit is communicated with the suction cavity of the subsequent-stage compression unit. The compression cavity of the last stage is communicated with the exhaust silencing cavity. The first oil suction passage is provided between the suction cavity of at least one stage of the compression unit and the low-pressure cavity; or, the compression assembly includes multiple stages of the compression units connected in parallel with each other. The compression cavity of each stage of the compression unit is communicated with the exhaust silencing cavity. The first oil suction passage is provided between the suction cavity of at least one stage of the compression unit and the low-pressure cavity.

[0010] In the double-loop differential-pressure oil pump compressor provided by the present invention, the compression assembly further includes a first crankshaft support and a second crankshaft support. The first crankshaft support and the second crankshaft support are coaxial and arranged at intervals in the sealing cavity. One end of the crankshaft is rotationally mated with the housing. The other end of the crankshaft is rotationally mated with the first crankshaft support and the second crankshaft support. Multiple stages of the compression units are all located between the first crankshaft support and the second crankshaft support. A second partition plate is provided between adjacent compression units. The crankshaft passes through the second partition plate; a first oil suction hole is provided on the first partition plate, and a second oil suction hole is provided on the first crankshaft support. The first oil suction hole is communicated with the second oil suction hole to form the first oil suction passage.

[0011] In the double-loop differential-pressure oil pump compressor provided by the present invention, at least one of the first crankshaft support, the second crankshaft support, and the second partition plate is provided with the second oil suction passage.

[0012] In the double-loop differential-pressure oil pump compressor provided by the present invention, the second oil suction passage is provided in the first crankshaft support. A first oil storage groove is provided at the outlet of the first crankshaft support corresponding to the second oil suction passage. The first oil storage groove is communicated with the oil passageways.

[0013] In the double-loop differential-pressure oil pump compressor provided by the present invention, a second oil storage groove is provided between the crankshaft and the second partition plate. The second oil storage groove is communicated with the oil passageways.

[0014] According to the dual-loop differential pressure oil pump compressor provided by the present invention, the first partition is integrally provided with the first crankshaft support.

[0015] According to the dual-loop differential pressure oil pump compressor provided by the present invention, the oil separator includes a spiral separation tube, a spiral oil separation channel is formed inside the spiral separation tube, an air inlet and an air outlet are respectively provided at both ends of the spiral separation tube, and both the air inlet and the air outlet are communicated with the oil separation channel; the air inlet is communicated with the compression cavity at the last stage, the air outlet is configured to be connected to an exhaust pipe, an oil drainage structure is provided on the outer side of the outer wall of the spiral separation tube, the oil drainage structure is communicated with the oil separation channel, and the oil drainage structure is communicated with the exhaust silencing cavity.

[0016] According to the dual-loop differential pressure oil pump compressor provided by the present invention, the spiral separation tube includes a plurality of spiral tube units connected in sequence, all the spiral tube units have the same structure, forming a cylindrical spiral separation tube, or the diameters of a plurality of the spiral tube units gradually decrease along the axial direction of the spiral separation tube, forming a conical spiral separation tube.

[0017] According to the dual-loop differential pressure oil pump compressor provided by the present invention, the oil drainage structure is provided at the bottom of the outer side of the outer wall of each spiral tube unit, an oil-attracting structure is provided on the outer side of the inner wall of the oil separation channel, and an oil-repellent structure is provided on the inner side of the inner wall of the oil separation channel.

[0018] The dual-loop differential pressure oil pump compressor provided by the present invention can realize dual-loop differential pressure oil pumping, ensure that the lubricating oil entering the low-pressure cavity from the high-pressure cavity can quickly return to the high-pressure cavity, ensure the long-term reliable lubrication of the friction pair, and can realize stable oil supply under the conditions of low speed, low oil level and gravity change, ensuring the lubrication effect and operation efficiency of the compressor. When the compression unit sucks air, the lubricating oil in the low-pressure cavity is sucked into the suction cavity along the first oil suction channel by using the suction pressure difference. After the lubricating oil enters the suction cavity, most of it flows back to the low-pressure cavity through the suction channel, and a small part adheres to the surface of the rotating piston and is brought into the corresponding compression cavity to lubricate the contact surface between the rotating piston and the corresponding cylinder block, and then follows the compressed gas into the oil separator. The separated lubricating oil finally flows back to the high-pressure cavity through the oil return channel. When the compression unit exhausts, under the action of the suction and exhaust pressure difference between the low-pressure cavity and the high-pressure cavity, the lubricating oil in the high-pressure cavity enters the mating clearance of the crankshaft through the second oil suction channel for lubrication, then passes through the oil channel into the central hole of the crankshaft, and then reaches the rotational mating of the crankshaft and the housing for lubrication, and finally flows back to the low-pressure cavity, realizing the circulating flow of the lubricating oil between the low-pressure cavity and the high-pressure cavity and providing long-term reliable lubrication for the corresponding friction pair.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 is one of the sectional views of the double-circuit differential pressure pump oil compressor provided by the embodiment of the present invention.

[0022] Figure 2 is the second sectional view of the double-circuit differential pressure pump oil compressor provided by the embodiment of the present invention.

[0023] Figure 3 is the third sectional view of the double-circuit differential pressure pump oil compressor provided by the embodiment of the present invention.

[0024] Figure 4 is the fourth sectional view of the double-circuit differential pressure pump oil compressor provided by the embodiment of the present invention.

[0025] Figure 5 is one of the schematic diagrams of the crankshaft in the double-circuit differential pressure pump oil compressor provided by the embodiment of the present invention.

[0026] Figure 6 is the second schematic diagram of the crankshaft in the double-circuit differential pressure pump oil compressor provided by the embodiment of the present invention.

[0027] Figure 7 is one of the schematic diagrams of the oil separator in the double-circuit differential pressure pump oil compressor provided by the embodiment of the present invention.

[0028] Figure 8 is the second schematic diagram of the oil separator in the double-circuit differential pressure pump oil compressor provided by the embodiment of the present invention.

[0029] Reference numerals:

[0030] 100. Housing; 110. Sealed cavity; 111. Low-pressure cavity; 112. High-pressure cavity; 113. Exhaust silencing cavity; 200. First partition; 300. Oil separator; 310. Oil separation channel; 320. Air inlet; 330. Exhaust port; 340. Oil drainage structure; 350. Oil-loving structure; 360. Oil-repellent structure; 400. Compression assembly; 410. Motor; 420. Crankshaft; 421. Oil passage; 422. Central hole; 430. Compression unit; 431. Cylinder block; 432. Rotary piston; 433. Suction cavity; 434. Compression cavity; 435. Exhaust cavity; 440. First crankshaft support; 441. First oil storage groove; 450. Second crankshaft support; 460. Second partition; 461. Second oil storage groove; 500. First oil suction channel; 600. Oil return channel; 700. Second oil suction channel. Detailed implementation manner

[0031] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0032] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the embodiments of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0033] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0034] In the embodiments of the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely means that the horizontal height of the first feature is less than that of the second feature.

[0035] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0036] The following will be combined with Figures 1 to 8 to describe the double-circuit differential-pressure pump oil compressor of the present invention.

[0037] Refer to Figures 1 to 6 As shown, the double-circuit differential-pressure pump oil compressor provided by the embodiments of the present invention includes: a housing 100, a first partition 200, an oil separator 300, and a compression assembly 400.

[0038] A sealed cavity 110 is formed inside the housing 100; the first partition 200 is located inside the sealed cavity 110 and divides the sealed cavity 110 into a low-pressure cavity 111 and a high-pressure cavity 112, and an exhaust silencing cavity 113 is provided inside the high-pressure cavity 112; the oil separator 300 is located inside the exhaust silencing cavity 113; the compression assembly 400 includes a motor 410, a crankshaft 420, and at least one stage of compression unit 430. Both ends of the crankshaft 420 are rotationally matched with the housing 100, and the motor 410 is drivingly connected to the crankshaft 420.

[0039] The compression unit 430 includes a cylinder block 431 and a rotary piston 432. The rotary piston 432 is provided on the crankshaft 420. An intake chamber 433 and a compression chamber 434 are provided between the cylinder block 431 and the corresponding rotary piston 432. The intake chamber 433 communicates with the corresponding compression chamber 434. A first oil suction passage 500 is provided between the intake chamber 433 and the low-pressure cavity 111. The compression chamber 434 communicates with the oil separator 300. An oil return passage 600 is provided between the exhaust muffler chamber 113 and the high-pressure cavity 112.

[0040] Oil passage 421 corresponding to the compression unit 430 one by one is provided at intervals on the crankshaft 420. A central hole 422 is provided in the crankshaft 420. The oil passage 421 communicates with the first end of the central hole 422. The second end of the central hole 422 communicates with the rotational mating part of the crankshaft 420 and the housing 100 and the low-pressure cavity 111 in sequence. A second oil suction passage 700 is provided between the high-pressure cavity 112 and the oil passage 421.

[0041] The double-circuit differential-pressure oil pumping compressor provided by the present invention can realize double-circuit differential-pressure oil pumping, ensure that the lubricating oil entering the low-pressure cavity 111 from the high-pressure cavity 112 can quickly return to the high-pressure cavity 112, guarantee the long-term reliable lubrication of the friction pair, and can realize stable oil supply under the conditions of low rotational speed, low oil level and gravity change, ensuring the lubrication effect and operation efficiency of the compressor.

[0042] The double-circuit differential-pressure oil pumping compressor provided by the present invention can realize differential-pressure oil pumping through two oil feeding paths.

[0043] Oil feeding path one: Oil is fed by using the pressure difference between the intake chamber 433 and the intake pressure, that is, intake oil feeding.

[0044] See Figure 1 and Figure 2 As shown, when the compression unit 430 intakes air, the lubricating oil in the low-pressure cavity 111 is sucked into the intake chamber 433 along the first oil suction passage 500 by using the intake pressure difference. After the lubricating oil enters the intake chamber 433, most of it flows back to the low-pressure cavity 111 through the intake passage, and a small part adheres to the surface of the rotary piston 432 and is carried into the corresponding compression chamber 434 to lubricate the contact surface between the rotary piston 432 and the corresponding cylinder block 431, and then follows the compressed gas into the oil separator 300. The separated lubricating oil finally flows back to the high-pressure cavity 112 through the oil return passage 600. The oil return passage 600 is a capillary passage.

[0045] Oil feeding path two: Oil is fed by using the pressure difference between the exhaust pressure and the intake pressure, that is, exhaust oil feeding.

[0046] See Figure 3 and Figure 4As shown, when the compression unit 430 exhausts air, under the action of the intake and exhaust pressure difference between the low-pressure cavity 111 and the high-pressure cavity 112, the lubricating oil in the high-pressure cavity 112 enters the mating clearance of the crankshaft 420 through the second oil suction channel 700 for lubrication, and then enters the central hole 422 of the crankshaft 420 through the oil channel 421, and then reaches the rotational mating of the crankshaft 420 and the housing 100 for lubrication, and finally returns to the low-pressure cavity 111, realizing the cyclic flow of the lubricating oil between the low-pressure cavity 111 and the high-pressure cavity 112, and providing long-term and reliable lubrication for the corresponding friction pairs.

[0047] In addition, since the high-pressure cavity 112 and the low-pressure cavity 111 are located on both sides of the first partition 200, when the attitude of the compressor changes, the lubricating oil in any one of the high-pressure cavity 112 and the low-pressure cavity 111 can smoothly enter the first oil suction channel 500, solving the problem of insufficient oil supply at the oil level height and the position of the moving pair in the compressor caused by the vibration and bump of the compressor, the change of the installation attitude or the change of the gravitational acceleration in the use scenario, and is applicable to scenarios such as automobiles, airplanes, high-speed rails, tanks, ships, flying cars, aerospace vehicles, satellites, space stations, and extraterrestrial space bases.

[0048] Specifically, the compression assembly 400 is used to compress gas, and finally discharge the compressed gas at a set pressure to a set position through the exhaust silencing cavity 113. The compression assembly 400 includes a motor 410, a crankshaft 420 and at least one-stage compression unit 430. The motor 410 is used to drive the crankshaft 420 to rotate, and the crankshaft 420 is used to drive the compression unit 430 to compress gas. The number of stages of the compression unit 430 is single-stage or multi-stage. When it is single-stage, the single-stage compression unit 430 is used to compress gas. When it is multi-stage, the multi-stage compression units 430 can be connected in series or in parallel in turn, and no limitation is made thereto.

[0049] An oil separator 300 is provided in the exhaust silencing cavity 113. The compressed gas at a set pressure contains some lubricating oil mist. Under the action of the oil separator 300, the oil mist can re-accumulate to form oil liquid and enter the exhaust silencing cavity 113.

[0050] In some embodiments, the cross-sectional size of the housing 100 can be correspondingly set according to the size of the internal cavity. For example, the cross-sectional size of the housing 100 corresponding to the position of the low-pressure cavity 111 is larger, and the cross-sectional size of the housing 100 corresponding to the position of the high-pressure cavity 112 is smaller.

[0051] See Figures 1 to 4As shown, according to some embodiments of the present invention, the compression assembly 400 includes a multi-stage compression unit 430 connected in series in sequence. The compression chamber 434 of the front-stage compression unit 430 is communicated with the suction chamber 433 of the rear-stage compression unit 430. The compression chamber 434 at the last stage is communicated with the exhaust silencing chamber 113. A first oil suction channel 500 is provided between the suction chamber 433 of at least one stage of the compression unit 430 and the low-pressure cavity 111.

[0052] By setting the compression assembly 400 as a multi-stage compression unit 430 connected in series in sequence, the gas can be compressed stage by stage to increase the pressure value of the gas. And a first oil suction channel 500 is provided between the suction chamber 433 of at least one stage of the compression unit 430 and the low-pressure cavity 111, which can use the pressure difference during suction to suck the lubricating oil in the low-pressure cavity 111 into the first oil suction channel 500, so that most of the lubricating oil flows back to the low-pressure cavity through the suction channel, and a small part of the lubricating oil passes through the suction chamber 433 and the compression chamber 434 of each stage of the compression unit 430 in sequence and finally enters the exhaust silencing chamber 113. Under the action of the oil separator 300, the oil in the oil-gas mixture is separated and flows back into the high-pressure cavity 112 through the oil return channel 600 to ensure that the lubricating oil in the high-pressure cavity 112 is within a preset range.

[0053] At this time, the first oil suction channel 500 can be provided between any stage of the compression unit 430 and the low-pressure cavity 111, or the first oil suction channel 500 can be provided between any multiple stages of the compression unit 430 and the low-pressure cavity 111. When the first oil suction channel 500 is only provided between a single-stage compression unit 430 and the low-pressure cavity 111, the lubricating oil in the low-pressure cavity 111 can be sucked into the compression assembly 400 when the corresponding stage of the compression unit 430 sucks air, and part of the lubricating oil after lubricating the corresponding friction pair is stored in the high-pressure cavity 112. When the first oil suction channel 500 is provided between multiple stages of the compression unit 430 and the low-pressure cavity 111 at the same time, the lubricating oil in the low-pressure cavity 111 can be sucked into the compression assembly 400 when multiple stages of the compression unit 430 suck air at the same time, and part of the lubricating oil after lubricating the corresponding friction pair is stored in the high-pressure cavity 112.

[0054] In addition, when the compression assembly 400 includes a multi-stage compression unit 430 connected in series in sequence, an exhaust cavity 435 can be provided downstream of the compression chamber 434 of at least one stage of the compression unit 430 to buffer and temporarily store the compressed gas.

[0055] See Figures 1 to 4As shown, for example, in this embodiment, the compression assembly 400 includes two stages of compression units 430 connected in series in sequence. In the two-stage compression units 430, a first oil suction channel 500 is provided between the first-stage compression unit 430 located upstream and the low-pressure cavity 111. The compression chamber 434 of the second-stage compression unit 430 located downstream communicates with the exhaust muffler cavity 113, and an exhaust cavity 435 is provided downstream of the compression chamber 434 of the first-stage compression unit 430.

[0056] According to some embodiments of the present invention, the compression assembly 400 includes multiple stages of compression units 430 connected in parallel with each other. The compression chamber 434 of each stage of compression unit 430 communicates with the exhaust muffler cavity 113, and a first oil suction channel 500 is provided between the suction chamber 433 of at least one stage of compression unit 430 and the low-pressure cavity 111.

[0057] By setting the compression assembly 400 as multiple stages of compression units 430 connected in parallel, the gas can be compressed simultaneously by the multiple stages of compression units 430, thereby improving the gas compression efficiency of the compressor. Similarly, a first oil suction channel 500 is provided between the suction chamber 433 of at least one stage of compression unit 430 and the low-pressure cavity 111, which can use the pressure difference during suction to suck the lubricating oil in the low-pressure cavity 111 into the first oil suction channel 500, so that most of the lubricating oil flows back to the low-pressure cavity through the suction channel, and a small part of the lubricating oil passes through the suction chamber 433 and the compression chamber 434 of each stage of compression unit 430 in sequence, and finally enters the exhaust muffler cavity 113. Under the action of the oil separator 300, the oil in the oil-gas mixture is separated and flows back into the high-pressure cavity 112 through the oil return channel 600 to ensure that the lubricating oil in the high-pressure cavity 112 is within a preset range.

[0058] At this time, the first oil suction channel 500 can be provided between any stage of compression unit 430 and the low-pressure cavity 111, or the first oil suction channel 500 can be provided between any multiple stages of compression units 430 and the low-pressure cavity 111. Similarly, when the first oil suction channel 500 is only provided between a single stage of compression unit 430 and the low-pressure cavity 111, the lubricating oil in the low-pressure cavity 111 can be sucked into the compression assembly 400 when the compression unit 430 of this stage sucks air, and part of the lubricating oil after lubricating the corresponding friction pairs is stored in the high-pressure cavity 112. When the first oil suction channel 500 is provided between multiple stages of compression units 430 and the low-pressure cavity 111 at the same time, the lubricating oil in the low-pressure cavity 111 can be sucked into the compression assembly 400 when the multiple stages of compression units 430 suck air at the same time, and part of the lubricating oil after lubricating the corresponding friction pairs is stored in the high-pressure cavity 112.

[0059] Similarly, when the compression assembly 400 includes multiple-stage compression units 430 connected in parallel to each other, an exhaust cavity 435 can be provided downstream of the compression cavity 434 of at least one stage of the compression unit 430 to buffer and temporarily store the compressed gas.

[0060] See Figures 1 to 4 As shown, according to some embodiments of the present invention, the compression assembly 400 further includes a first crankshaft support 440 and a second crankshaft support 450. The first crankshaft support 440 and the second crankshaft support 450 are coaxial and spaced in the sealing cavity 110. One end of the crankshaft 420 is rotatably fitted with the housing 100, and the other end of the crankshaft 420 is rotatably fitted with the first crankshaft support 440 and the second crankshaft support 450. The multiple-stage compression units 430 are all located between the first crankshaft support 440 and the second crankshaft support 450. A second partition 460 is provided between adjacent compression units 430, and the crankshaft 420 passes through the second partition 460; a first oil suction hole 510 is provided on the first partition 200, and a second oil suction hole 520 is provided on the first crankshaft support 440. The first oil suction hole 510 and the second oil suction hole 520 are communicated to form a first oil suction channel 500.

[0061] By providing the first crankshaft support 440 and the second crankshaft support 450, the crankshaft 420 can be supported and fixed, ensuring that it can rotate stably under the driving action of the motor 410. All the compression units 430 are located between the first crankshaft support 440 and the second crankshaft support 450, which can improve the compactness of the compressor. The second partition 460 can effectively separate the compression units 430 at all levels, and the second partition 460 can limit the cylinder blocks of the compression units 430 at all levels. The first oil suction hole 510 is provided on the first partition 200, and the second oil suction hole 520 is provided on the first crankshaft support 440. During processing, the first oil suction hole 510 and the second oil suction hole 520 can be drilled on the first partition 200 and the first crankshaft support 440 respectively. During assembly, the outlet of the first oil suction hole 510 is aligned with the inlet of the second oil suction hole 520 and sealed and connected, which is convenient for processing the first oil suction channel 500.

[0062] Specifically, in this embodiment, the first crankshaft support 440 is located on the side where the first partition 200 is located, and the two are adjacent to each other and are fixedly connected by bolts. The inlet end of the first oil suction hole 510 is located at the bottom of the first partition 200 to meet the oil suction function when the lubricating oil level in the low-pressure cavity 111 is relatively low.

[0063] In some embodiments, the first partition 200 and the first crankshaft support 440 can also be integrally provided to further improve the compactness of the compressor.

[0064] According to some embodiments of the present invention, at least one of the first crankshaft support 440, the second crankshaft support 450, and the second partition 460 is provided with a second oil suction passage 700.

[0065] By providing the second oil suction passage 700 in at least one of the first crankshaft support 440, the second crankshaft support 450, and the second partition 460, the lubricating oil in the high-pressure cavity 112 can be driven by the suction and exhaust pressure difference to smoothly enter the fitting clearance between the crankshaft 420 and the corresponding components, so as to meet the lubrication effect when the crankshaft 420 rotates.

[0066] Specifically, the second oil suction passage 700 can be provided in any one of the first crankshaft support 440, the second crankshaft support 450, and the second partition 460, or the second oil suction passage 700 can be provided in at least two of the first crankshaft support 440, the second crankshaft support 450, and the second partition 460.

[0067] As an example, in this embodiment, the compression assembly 400 includes two-stage compression units 430 arranged in series. Oil passage 421 is provided on the crankshaft 420 corresponding to the first-stage compression unit 430 and the second-stage compression unit 430. The second oil suction passage 700 is provided in the first crankshaft support 440. Under the action of the suction and exhaust pressure, the lubricating oil in the high-pressure cavity 112 enters the fitting clearance between the crankshaft 420 and the first crankshaft support 440 through the second oil suction passage 700, and then reaches the central hole 422 of the crankshaft 420 through the two oil passages 421, and finally returns to the low-pressure cavity 111 through the rotational connection between the crankshaft 420 and the housing 100.

[0068] According to some embodiments of the present invention, the second oil suction passage 700 is provided in the first crankshaft support 440. A first oil storage groove 441 is provided at the outlet of the first crankshaft support 440 corresponding to the second oil suction passage 700. The first oil storage groove 441 is communicated with the oil passage 421. A second oil storage groove 461 is provided between the crankshaft 420 and the second partition 460. The second oil storage groove 461 is communicated with the oil passage 421.

[0069] By providing the first oil storage groove 441, when the lubricating oil is discharged from the outlet end of the second oil suction passage 700, it can be accumulated in the first oil storage groove 441 to fully supply oil to the fitting clearance between the crankshaft 420 and the corresponding components. By providing the second oil storage groove 461, the connection passage volume between adjacent oil passages 421 can be increased, the flow rate of the lubricating oil between the oil passages 421 can be improved, and thus the lubrication effect of the crankshaft 420 can be improved.

[0070] See Figures 7 to 8As shown, according to some embodiments of the present invention, the oil separator 300 includes a spiral separation tube in which a spiral oil separation channel 310 is formed. An air inlet 320 and an exhaust port 330 are respectively provided at both ends of the spiral separation tube. Both the air inlet 320 and the exhaust port 330 are in communication with the oil separation channel 310. The air inlet 320 is in communication with the compression chamber 434 at the last stage, and the exhaust port 330 is configured to be connected to an exhaust pipe. An oil drainage structure 340 is provided outside the outer wall of the spiral separation tube. The oil drainage structure 340 is in communication with the oil separation channel 310 and the exhaust silencing chamber 113.

[0071] It should be noted that the "outside of the outer wall of the spiral separation tube" mentioned above can be seen as Figure 8 shown by the arrow direction in

[0072] By setting the oil separator 300 as a spiral separation tube type, during operation, the compressed gas carrying tiny lubricating oil droplets enters the oil separation channel 310 through the air inlet 320. Under the action of the centrifugal force in the spiral oil separation channel 310, the lubricating oil droplets can adhere to the outer side of the inner wall of the spiral separation tube. When accumulated to a certain extent, the tiny lubricating oil droplets can form larger lubricating oil droplets and are discharged through the oil drainage structure 340 provided on the outer side of the outer wall of the spiral separation tube, which can prevent the tiny lubricating oil droplets from following the compressed gas into the system. The oil separation effect is good, and the oil separator 300 separates oil and gas through the centrifugal force of the spiral separation tube, which can meet the oil and gas separation requirements in normal gravity and micro-gravity scenarios, and solves the defect of poor oil separation effect of the existing oil separator 300 in normal gravity and micro-gravity scenarios.

[0073] Specifically, the spiral separation tube includes a plurality (greater than or equal to two) of spiral tube units connected in sequence, and the inner diameter of the spiral separation tube can be adjusted according to specific application requirements. For example, according to the exhaust volume of the compressor, the inner diameter of the spiral separation tube is adjusted to optimize the gas flow rate and separation effect. If the exhaust volume is large, a larger inner diameter can be designed to avoid too rapid air flow and ensure that the oil droplets have enough time to be separated. If the exhaust volume is small, the inner diameter can be appropriately reduced to increase the rotation speed of the gas, thereby enhancing the centrifugal force and improving the separation effect. The design parameters of the spiral separation tube can also be adjusted according to the exhaust volume, flow rate, and oil-gas mixing degree of the compressor. For example, the adjustment of the inner diameter and the number of spiral tube units of the spiral separation tube can ensure efficient oil and gas separation under various working conditions.

[0074] The oil drainage structure 340 can adopt various forms such as oil drainage holes, oil drainage grooves, or oil drainage hollows. Among them, the oil drainage holes are formed by setting several (greater than or equal to one) holes on the outer side of the outer wall of the spiral separation tube, and the separated lubricating oil can flow along the inner wall of the tube and be smoothly discharged through the oil drainage holes. The oil drainage groove is similar to the oil drainage hole, and it forms a groove-like structure such as a strip shape or a square shape on the outer side of the outer wall of the spiral tube. The oil drainage hollow reduces the resistance to the air flow by hollowing out some areas or forming channels on the outer wall of the spiral tube, so that the oil can flow out through the gaps, and it is applicable to the scenario with a high oil drainage rate.

[0075] See Figure 7 and Figure 8 As shown, by way of example, the oil drainage structure 340 in this embodiment is an oil drainage hole, which has a simple structure and is easy to process and manufacture. The aperture of the oil drainage hole can be set according to actual needs. For example, the ratio of the aperture of the spiral separation tube to the aperture of the oil drainage hole is set in the range of 2 to 20, and the aperture size is adjusted according to the exhaust volume of the compressor, the degree of oil-gas mixing, and the separation efficiency requirements. For applications with a large exhaust volume, the aperture of the oil drainage hole can be appropriately increased to ensure that the oil can be smoothly discharged and avoid excessive accumulation of oil affecting the separation effect; while for applications with a small exhaust volume, the aperture of the oil drainage hole can be reduced to ensure that the oil drainage process does not affect the gas flow and at the same time achieve an ideal oil-gas separation effect.

[0076] See Figure 7 and Figure 8 As shown according to some embodiments of the present invention, the spiral separation tube includes a plurality of spiral tube units connected in sequence, and all the spiral tube units have the same structure, forming a cylindrical spiral separation tube.

[0077] By connecting a plurality of spiral tube units in series, a longer oil-gas separation path can be achieved, improving the oil-gas separation effect. Each spiral tube unit is designed with a spiral structure, so that the oil-gas mixture moves spirally in the pipeline, enhancing the separation efficiency of the oil and gas. And since all the spiral tube units have the same structure, the production and manufacturing process can be simplified.

[0078] According to some embodiments of the present invention, the diameters of the plurality of spiral tube units gradually decrease along the axial direction of the spiral separation tube, forming a conical spiral separation tube.

[0079] By setting the diameters of the plurality of spiral tube units to gradually decrease, the oil-gas separation process can be optimized, gradually accelerating the rotational movement of the air flow, thereby improving the oil-gas separation efficiency.

[0080] Specifically, as the diameter of the spiral tube unit decreases, the speed of the air flow will gradually increase, and the separation effect of the oil in the air flow will also be enhanced. Especially at a higher speed, the separation of the oil and gas is more thorough.

[0081] It should be noted that the number of helical tube units can be set according to actual needs. Without affecting the exhaust, by increasing or decreasing the number of helical tube units, the separation effect and processing capacity of the separator can be flexibly adjusted. If the exhaust volume is large, the number of helical tube units can be increased to provide a longer separation path and improve the oil-gas separation effect; conversely, if the exhaust volume is small, the number of helical tube units can be reduced to ensure smooth air flow and a stable separation effect.

[0082] See Figure 7 and Figure 8 As shown, according to some embodiments of the present invention, an oil drainage structure 340 is provided at the outer bottom of the outer wall of each helical tube unit.

[0083] By providing an oil drainage structure 340 at the outer bottom of the outer wall of each helical tube unit, the accumulated oil in each helical tube unit can be effectively drained in time, avoiding the accumulation of oil in the separation tube and thus affecting the oil-gas separation effect. Setting the oil drainage structure 340 at the bottom is conducive to the oil flowing naturally to the oil drainage structure 340 by its own gravity, thereby realizing the automatic discharge of the oil.

[0084] It should be noted that the above-mentioned "outer bottom of the outer wall of the helical tube unit" specifically refers to the lowest position of the outer wall of the helical tube unit after the oil separator 300 is installed on the compressor.

[0085] According to some embodiments of the present invention, an oil-attracting structure 350 is provided on the outer side of the inner wall of the oil separation channel 310, and an oil-repellent structure 360 is provided on the inner side of the inner wall of the oil separation channel 310.

[0086] By providing an oil-attracting structure 350 on the outer side of the inner wall of the oil separation channel 310 and an oil-repellent structure 360 on the inner side of the inner wall of the oil separation channel 310, the oil can be effectively guided to the outside of the channel, while reducing the adhesion of the oil on the inner side of the inner wall, and the wall surface affects the exhaust effect.

[0087] Specifically, the function of the oil-attracting structure 350 on the outer side is to attract and hold the oil, making it move towards the exhaust structure, while the oil-repellent structure 360 can effectively reduce the adhesion of the oil on the inner side of the inner wall, enabling the air flow to pass through the oil separation channel 310 more smoothly and preventing the secondary adhesion and accumulation of the oil.

[0088] The oil-attracting structure 350 can be an oil-attracting layer or an oil-attracting micro-nano convex structure, etc. The oil-repellent structure 360 can be an oil-repellent layer or an oil-repellent micro-nano convex structure, etc.

[0089] As an example, in this embodiment, the oil-loving structure 350 is an oil-loving layer, and the oil-repellent structure 360 is an oil-repellent layer. Among them, the oil-loving structure 350 and the oil-repellent structure 360 can be prepared by electroplating, electroless plating and other methods. For example, when processing the oil-loving structure 350, a part of the spiral separation tube corresponding to the oil-repellent structure 360 can be physically shielded. After the oil-loving structure 350 is processed, a part of the spiral separation tube corresponding to the oil-loving structure 350 can be physically shielded to process the oil-repellent structure 360. After the oil-loving structure 350 and the oil-repellent structure 360 are processed, the tube body can be bent into a spiral shape.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments or equivalently replace some of the technical features. However, such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A double-circuit differential pressure oil pump compressor, characterized in that, Comprising: A housing, within which a sealed cavity is formed; A first partition, which is located within the sealed cavity and divides the sealed cavity into a low-pressure cavity and a high-pressure cavity, and an exhaust silencing cavity is provided within the high-pressure cavity; An oil separator, which is located within the exhaust silencing cavity; A compression assembly, the compression assembly includes a motor, a crankshaft and at least one stage of compression unit, both ends of the crankshaft are rotationally engaged with the housing, and the motor is drivingly connected to the crankshaft; The compression unit includes a cylinder block and a rotary piston, the rotary piston is provided on the crankshaft, an intake cavity and a compression cavity are provided between the cylinder block and the corresponding rotary piston, the intake cavity is communicated with the corresponding compression cavity, a first oil suction channel is provided between the intake cavity and the low-pressure cavity, the compression cavity is communicated with the oil separator, and an oil return channel is provided between the exhaust silencing cavity and the high-pressure cavity; Oil passageways corresponding to the compression units one by one are provided at intervals on the crankshaft, a central hole is provided within the crankshaft, the oil passageways are communicated with the first end of the central hole, the second end of the central hole is sequentially communicated with the rotational engagement positions of the crankshaft and the housing and the low-pressure cavity, and a second oil suction channel is provided between the high-pressure cavity and the oil passageways.

2. The double-loop differential pressure pump oil compressor according to claim 1, characterized in that, The compression assembly includes multiple stages of the compression units connected in series in sequence, the compression cavity of the previous stage of the compression unit is communicated with the intake cavity of the next stage of the compression unit, the compression cavity of the last stage is communicated with the exhaust silencing cavity, and the first oil suction channel is provided between the intake cavity of at least one stage of the compression unit and the low-pressure cavity; Or, the compression assembly includes multiple stages of the compression units connected in parallel with each other, the compression cavity of each stage of the compression unit is communicated with the exhaust silencing cavity, and the first oil suction channel is provided between the intake cavity of at least one stage of the compression unit and the low-pressure cavity.

3. The double-circuit differential-pressure pump oil compressor according to claim 2, wherein, The compression assembly further includes a first crankshaft support and a second crankshaft support, the first crankshaft support and the second crankshaft support are coaxial and spaced within the sealed cavity, one end of the crankshaft is rotationally engaged with the housing, the other end of the crankshaft is rotationally engaged with the first crankshaft support and the second crankshaft support, multiple stages of the compression units are all located between the first crankshaft support and the second crankshaft support, a second partition is provided between adjacent compression units, and the crankshaft passes through the second partition; A first oil suction hole is provided on the first partition, a second oil suction hole is provided on the first crankshaft support, and the first oil suction hole is communicated with the second oil suction hole to form the first oil suction channel.

4. The double-circuit differential-pressure pump oil compressor according to claim 3, characterized in that, At least one of the first crankshaft support, the second crankshaft support and the second partition is provided with the second oil suction channel.

5. The double-loop differential pressure pump oil compressor according to claim 4, wherein The second oil suction channel is provided within the first crankshaft support, a first oil storage groove is provided at the outlet of the first crankshaft support corresponding to the second oil suction channel, and the first oil storage groove is communicated with the oil passageway.

6. The double-loop differential-pressure oil compressor according to claim 3, wherein, A second oil storage groove is provided between the crankshaft and the second partition, and the second oil storage groove is communicated with the oil passageway.

7. The double-circuit differential pressure pump oil compressor according to claim 3, characterized in that, The first partition is integrally provided with the first crankshaft support member.

8. The double-loop differential pressure pump oil compressor according to any one of claims 1 to 7, characterized in that, The oil separator includes a spiral separation tube, a spiral oil separation channel is formed in the spiral separation tube, an air inlet and an exhaust port are respectively provided at two ends of the spiral separation tube, and both the air inlet and the exhaust port are communicated with the oil separation channel; The air inlet is communicated with the compression chamber at the last stage, the exhaust port is configured to be connected to an exhaust pipe, an oil drainage structure is provided on the outer side of the outer wall of the spiral separation tube, the oil drainage structure is communicated with the oil separation channel, and the oil drainage structure is communicated with the exhaust silencing chamber.

9. The double-circuit differential pressure oil compressor according to claim 8, characterized in that, The spiral separation tube includes a plurality of spiral tube units connected in sequence, all the spiral tube units have the same structure to form a cylindrical spiral separation tube, or the diameters of the plurality of spiral tube units gradually decrease along the axial direction of the spiral separation tube to form a conical spiral separation tube.

10. The double-loop differential pressure pump oil compressor according to claim 8, characterized in that, The oil drainage structure is provided at the outer bottom of the outer wall of each spiral tube unit, an oil-loving structure is provided on the outer side of the inner wall of the oil separation channel, and an oil-repellent structure is provided on the inner side of the inner wall of the oil separation channel.

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