Horizontal scroll machine with through shaft and oil pump in the center of the static disc and lubrication method

Abstract

A horizontal scroll machine with a through shaft and a built-in oil pump at the center of the stationary disc, and a lubrication method thereof, are disclosed. The horizontal scroll machine includes a horizontal housing, a stationary disc, a moving disc, a support bearing housing, a through shaft, and a built-in oil pump. A closed lubricating oil pool is provided at the bottom of the horizontal housing. The stationary disc is fixed within the housing cavity, and the built-in oil pump is centrally mounted thereon, with its rotor coaxially connected to the through shaft. The support bearing housing fits snugly against the stationary disc. Both the stationary disc and the support bearing housing have internal suction and connecting sections, respectively, which connect and align with the oil pump inlet and the lubricating oil pool. One end of the through shaft passes through the moving disc and the bearing hole of the support bearing housing, and is fixed to the oil pump rotor. The other end is a series connection end, allowing for a rigid coaxial connection to another device. An axial central oil hole is provided within the through shaft, connecting to the oil pump outlet, and radial oil outlet holes are provided at corresponding lubrication points. This invention reduces the structural complexity and manufacturing cost of multi-machine series units, optimizes the lubrication system layout, simplifies the oil circuit, and improves operational stability.

Description

Technical Field

[0001] This invention belongs to the field of scroll machinery technology, specifically relating to a horizontal scroll machine with a through shaft and a built-in oil pump in the center of the stationary disc, and a lubrication method thereon. Background Technology

[0002] As a type of positive displacement rotary fluid machinery, scroll machinery achieves periodic changes in the volume of the working chamber through the relative rotational motion of the stationary and moving scrolls, thereby completing core processes such as fluid intake, compression (or expansion), and exhaust. Compared to traditional piston and screw fluid machinery, scroll machinery has significant advantages such as high volumetric efficiency, low operating vibration, compact structure, low noise, easy implementation of variable frequency speed regulation, and long service life. It has been widely used in many important fields, including refrigeration and air conditioning, heat pump systems, dynamic expansion energy recovery, industrial gas compression, and semiconductor vacuum acquisition.

[0003] With the rapid development of industrial equipment towards integration, miniaturization, high efficiency, and low cost, and the increasing demands for equipment reliability and ease of maintenance in application scenarios, existing scroll machinery still has many technical shortcomings in its lubrication system design and multi-machine series adaptation that urgently need to be addressed in practical applications. These shortcomings are as follows: On the one hand, the existing lubrication system design for scroll machinery has obvious irrationalities in the arrangement of lubrication pumps. Currently, most mainstream lubrication pumps in the industry are externally mounted or located in non-core areas, which can be divided into three categories: First, the lubrication pump is placed on the non-scroll side of the machine body, that is, far away from the core lubrication requirement area of ​​the scroll meshing pair; second, the lubrication pump is directly fixed to the outside of the machine body; and third, the lubrication pump is installed on the outside of the machine body through an independent bracket, arranged separately from the main unit. The aforementioned layout necessitates a longer oil pipeline design for the lubrication system, requiring multiple connection joints to accommodate the pipeline routing. This not only increases the risk of oil leakage, leading to frequent leaks and affecting the sealing and reliability of the lubrication system, but also causes wear, jamming, and other malfunctions in core moving components such as the scroll meshing pair, spindle, and bearings due to insufficient lubrication, thus shortening the overall service life of the machine. Furthermore, the external or separate layout results in a loose overall layout of the scroll machinery, low integration, and a greater need for installation space, making it difficult to adapt to space-constrained applications. The increased number of pipelines and joints also raises the manufacturing cost and the difficulty of subsequent maintenance, hindering the miniaturization and integration of the equipment.

[0004] On the other hand, in terms of multi-machine series adaptation, the lubrication system design of existing multi-stage series scroll turbine units suffers from redundancy and inefficiency. In industrial scenarios such as large-scale gas compression and high-pressure specific energy recovery, a single scroll turbine often cannot meet the operating requirements. Therefore, it is necessary to combine multiple scroll turbines in series to form a multi-stage series scroll turbine unit to achieve higher compression ratios, larger displacements, or more efficient energy recovery. However, currently, these multi-stage series scroll turbine units typically have an independent lubrication system for each scroll turbine, and each lubrication system requires complete components such as a lubricating oil pump, oil tank, filter, pipelines, and control elements. This design not only significantly increases the overall equipment size and manufacturing cost of the unit, resulting in a complex structure and increased weight, which is not conducive to the transportation and installation of the equipment; more importantly, the coordinated control of multiple independent lubrication systems is extremely difficult. It is difficult to achieve precise matching and synchronous control of the lubricating oil quantity and oil pressure between the lubrication systems, which can easily lead to insufficient lubrication in some units and excessive lubrication in others. This not only affects the overall operating efficiency of the unit, but may also cause damage to core components due to lubrication imbalance, reducing the operational stability and reliability of the multi-stage series scroll turbine unit. Summary of the Invention

[0005] The purpose of this invention is to address the problems in the prior art by providing a horizontal scroll machine with a through shaft and a built-in oil pump at the center of the stationary disc, and a lubrication method thereon. This enables the horizontal scroll machine to be connected in series on the same axis, optimizes the lubrication system layout, simplifies the oil circuit, improves the overall integration and operational stability of the machine, and reduces the structural complexity and manufacturing cost of multi-machine series units.

[0006] To achieve the above objectives, the present invention provides the following technical solution: Firstly, a horizontal scroll machine with a through shaft and a built-in oil pump at the center of the stationary disc is provided, comprising a horizontal housing, a stationary disc, a moving disc, a support bearing housing, a through shaft, and a built-in oil pump; the bottom of the horizontal housing is provided with a closed lubricating oil pool; the stationary disc is fixed in the inner cavity of the horizontal housing, and the built-in oil pump is positioned and installed in the central area of ​​the stationary disc, with the oil pump rotor of the built-in oil pump coaxially connected to the through shaft; the moving disc is mounted on the through shaft, and when the through shaft rotates, it drives the moving disc to revolve and translate around the stationary disc, completing the compression process of the medium, and simultaneously driving the oil pump rotor of the built-in oil pump to rotate; the support bearing housing is fitted and connected to the end face of the stationary disc, and the interior of the stationary disc has a lubricating oil suction section channel, and the interior of the support bearing housing has a lubricating oil connecting section channel, for lubricating oil suction... One end of the segment channel is sealed and connected to the oil inlet of the built-in oil pump; the other end of the lubricating oil suction segment channel is connected to one end of the lubricating oil connecting segment channel; the other end of the lubricating oil connecting segment channel is connected to the lubricating oil sump. The through shaft is an integral rigid shaft. One end of the through shaft horizontally passes through the central shaft hole of the moving disc and the bearing hole on the supporting bearing seat, and extends into the central area of ​​the stationary disc to be coaxially and fixedly connected to the oil pump rotor of the built-in oil pump. The other end of the through shaft forms a series connection end, which can be coaxially and rigidly connected to another vortex machine or power machine. A central oil hole is opened axially inside the through shaft, and the oil outlet of the built-in oil pump is connected to the inlet of the central oil hole. Radial oil outlet holes are opened on the through shaft at the positions of the components that need lubrication.

[0007] As a preferred embodiment, the central area of ​​the stationary disc has an oil pump mounting cavity, and the built-in oil pump is adapted to be installed in the oil pump mounting cavity; the oil pump housing of the built-in oil pump and the oil pump mounting cavity of the stationary disc are positioned and fitted by a stop or a positioning pin, and a sealing ring is embedded at the mating surface, and the oil pump housing and the stationary disc are fastened together to form an integrated stationary disc-oil pump assembly.

[0008] As a preferred embodiment, the central area of ​​the stationary disc has an oil pump mounting cavity, which is machined to have the same inner wall structure as the oil pump housing of the built-in oil pump. The oil pump rotor of the built-in oil pump is directly assembled in the oil pump mounting cavity, forming an integrated assembly of stationary disc and oil pump rotor.

[0009] As a preferred embodiment, the exhaust side of the stationary disc is provided with a separate independent oil pump seat, and the built-in oil pump is installed on the oil pump seat; or, the built-in oil pump is directly installed on the inside of the end cover of the horizontal housing.

[0010] As a preferred embodiment, the series connection end of the through shaft is rigidly connected to another vortex machine or power machine through a coupling, hydraulic coupling, flange or spline structure, or by adopting a coaxial direct connection mode.

[0011] As a preferred embodiment, when the rotor of the built-in oil pump rotates, under the suction action, the lubricating oil in the lubricating oil pool is sequentially drawn into the built-in oil pump through the lubricating oil connecting section channel and the lubricating oil suction section channel; after being pressurized by the built-in oil pump, the lubricating oil enters the central oil hole of the through shaft through the oil outlet, and then is delivered to the part that needs lubrication through the radial oil outlet, so as to achieve forced lubrication. The lubricated oil flows back to the lubricating oil pool, forming a closed lubrication cycle.

[0012] As a preferred embodiment, the components requiring lubrication include the main bearing and the moving plate base bearing; The main bearing is fixed on the supporting bearing housing, and one end of the through shaft passes horizontally through the bearing hole of the main bearing. The main bearing supports the through shaft. The bearing on the base plate of the moving plate is fixed at the base plate of the moving plate. One end of the through shaft passes horizontally through the bearing hole on the bearing on the base plate of the moving plate and mates with the moving plate. With the drive of the through shaft, the moving plate can achieve revolution and translation, while also providing auxiliary support for the through shaft.

[0013] As a preferred embodiment, the lubricating oil tank is equipped with a filter assembly for filtering impurities in the lubricating oil, and the filter assembly is located at the end of the lubricating oil connecting section channel that is connected to the lubricating oil tank.

[0014] Secondly, a lubrication method for a horizontal scroll machine with a through shaft and a built-in oil pump at the center of the stationary disc is provided, including: A horizontal scroll machine can be rigidly connected to other scroll machines or power machines by means of a through shaft. The drive shaft rotates, causing the moving disc to revolve around the stationary disc, which in turn causes the volute teeth of the moving disc and the stationary disc to mesh and form a continuous change in the closed cavity, thus completing the compression or expansion process of the medium. At the same time, the drive shaft drives the oil pump rotor of the built-in oil pump, which is fixed in the central area of ​​the stationary disc, to rotate, triggering the suction and pressurization actions of the built-in oil pump. Lubricating oil is drawn into the lubricating oil pool at the bottom of the horizontal housing by the action of the built-in oil pump, and flows through the lubricating oil connecting section channel opened on the support bearing seat and the lubricating oil suction section channel opened on the stationary plate in sequence, and enters the oil inlet of the built-in oil pump. The high-pressure lubricating oil, after being pressurized by the built-in oil pump, enters the central oil hole of the through shaft from the oil outlet of the built-in oil pump, and then is delivered to the parts that need lubrication through the preset radial oil outlet on the through shaft to achieve forced lubrication. The lubricating oil after lubrication flows back to the lubrication oil pool, forming a closed lubrication cycle.

[0015] As a preferred solution, multiple horizontal scroll machines connected in series via a through shaft use the same built-in oil pump to achieve forced lubrication.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects: One end of the through shaft horizontally passes through the central shaft hole of the moving plate, the main bearing on the support bearing seat, and the bearing hole of the bearing on the base plate of the moving plate, extending into the central area of ​​the stationary plate and coaxially and fixedly connected to the oil pump rotor of the built-in oil pump; the other end of the through shaft forms a series connection end, which can achieve a coaxial rigid connection with another scroll machine or power machine without the need for additional couplings or other transmission components, significantly improving the coaxiality and operational synchronization of multiple machines in series; in addition, the series units can share a single lubrication system, eliminating the need to configure an independent lubrication system for each unit, greatly simplifying the structural design of multi-stage series units, reducing equipment manufacturing costs and the complexity of coordinated control of multiple lubrication systems, and improving the operational stability of multi-stage series units. The lubrication system consists of a closed lubricating oil sump, an oil inlet channel, a built-in oil pump, a central oil hole, radial oil outlets, and various lubrication points, forming a closed-loop circulation circuit. The lubricating oil can be reused within the circuit, significantly reducing lubricating oil consumption. Simultaneously, the forced pressure oil supply mode precisely matches the lubrication requirements of the components, avoiding the energy waste caused by excessive oil supply in existing lubrication systems. While ensuring good lubrication performance, it also considers energy saving, reducing the overall operating energy consumption of the machine. This invention uses an independent, sealed oil inlet channel formed by an oil suction section channel inside the stationary disc and a lubricating oil connecting section channel inside the supporting bearing housing. Combined with the closed lubricating oil sump at the bottom of the horizontal housing, this forms a well-sealed lubrication circuit. The built-in oil pump is coaxially fixedly connected to the through shaft and rotates synchronously with the through shaft, achieving forced pressure oil supply. Even at low speeds, it ensures a stable oil supply. Furthermore, the central oil hole inside the through shaft matches the radial oil outlets at the corresponding lubrication points, enabling precise oil supply to each core lubrication point and significantly improving lubrication reliability. The through shaft of this invention is an integral rigid shaft. The through shaft is designed to function as both a transmission and oil supply carrier, realizing the integration of transmission and oil supply, and reducing the structural complexity and manufacturing cost of the series unit.

[0017] Furthermore, this invention adapts and installs the built-in oil pump within the oil pump mounting cavity in the central area of ​​the stationary disc, fully utilizing the structural space of the stationary disc itself. Unlike existing technologies, it eliminates the need to place the lubricating oil pump on the non-scroll side of the machine body, outside the housing, or on a separate bracket, thus eliminating the traditional external oil pump and external lubricating oil pipeline. Simultaneously, the oil pump housing of the built-in oil pump is positioned and fitted to the stationary disc via a stop or locating pin, and fastened with bolts or a tight fit, forming an integrated stationary disc-oil pump assembly. Even further, the oil pump mounting cavity is machined with the same inner wall structure as the built-in oil pump housing, allowing the oil pump rotor of the built-in oil pump to be directly assembled within the mounting cavity, forming an integrated stationary disc-oil pump rotor assembly. This enables integrated machining of the stationary disc and oil pump, significantly reducing the number of components and oil circuit connection joints, fundamentally reducing leakage points, highly integrating the lubrication system with the main unit, significantly reducing the overall machine size, optimizing the overall layout, and making it more suitable for space-constrained applications.

[0018] Furthermore, a filter assembly for filtering impurities in the lubricating oil is installed in the lubricating oil sump. The filter assembly is located at the end of the lubricating oil connecting section channel that connects to the lubricating oil sump, which prevents impurities from entering the core components and causing wear, and extends the service life of the lubricating oil and various moving parts.

[0019] Furthermore, the structure of the built-in oil pump installed in the center area of ​​the stationary disc can be adapted to meet the actual working conditions. For example, the oil pump seat can be set on the exhaust side of the stationary disc or the oil pump can be directly installed inside the end cover, flexibly meeting the structural design requirements of different models and applications of scroll machinery. At the same time, the whole machine adopts a horizontal layout, combined with the features of precise lubrication and multi-machine series adaptation, which can be widely used in various scenarios such as refrigeration, air conditioning, heat pump, power expansion recovery and industrial fluid pressurization. Moreover, by connecting multiple machines in series, it can meet the multi-stage compression / expansion requirements of high pressure ratio and large displacement, thus expanding the application range. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 A schematic diagram of a horizontal scroll mechanical structure with a through shaft and a built-in oil pump at the center of the stationary disc, according to an embodiment of the present invention. In the attached diagram: 1-Horizontal housing; 2-Stationary disc; 3-Moving disc; 4-Support bearing seat; 5-Through shaft; 6-Built-in oil pump; 7-Main bearing; 81-Lubricating oil suction section channel; 82-Lubricating oil connecting section channel; 9-Moving disc base plate bearing; 10-Central oil hole; 11-Radial oil outlet hole. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, those skilled in the art can obtain other embodiments without creative effort.

[0023] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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 the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] Horizontal scroll machinery is a volumetric rotary fluid machine with a horizontally arranged main shaft and a scroll meshing pair as its core working unit. It is one of the mainstream structural forms of scroll fluid machinery. The core product category is the horizontal scroll compressor, while also encompassing derivative models such as horizontal scroll expanders, scroll vacuum pumps, and scroll hydraulic pumps. The general core components of horizontal scroll machinery are consistent with those of scroll machinery, and have been specifically optimized for horizontal layout. It consists of a pair of stationary scrolls (fixed) and moving scrolls (moving) with a 180° phase difference and precisely matched profiles, forming a scroll working pair. After meshing, they form multiple pairs of independent crescent-shaped closed working chambers.

[0025] Please see Figure 1 This invention proposes a horizontal scroll machine with a through shaft and a centrally located oil pump. Through the through shaft structure design, the integration of the central oil pump on the stationary disc, and the optimization of the combined oil inlet channel between the stationary disc and the bearing housing, a high degree of integration between the lubrication system and the main machine is achieved, enabling convenient coaxial series connection of multiple machines. Specifically, the main structure of this horizontal scroll machine includes a horizontal housing 1, a stationary disc 2, a moving disc 3, a supporting bearing housing 4, a through shaft 5, and a centrally located oil pump 6.

[0026] The bottom of the horizontal housing 1 is provided with a closed lubricating oil pool; The stationary disc 2 is fixed in the inner cavity of the horizontal housing 1. The built-in oil pump 6 is installed in the center area of ​​the stationary disc 2. The oil pump rotor of the built-in oil pump 6 is coaxially connected to the through shaft 5. The moving disc 3 is installed on the through shaft 5. When the through shaft 5 rotates, it drives the moving disc 3 to revolve around the stationary disc 2 to complete the compression process of the medium, and at the same time drives the oil pump rotor of the built-in oil pump 6 to rotate. The bearing housing 4 and the stationary plate 2 are connected to each other. The stationary plate 2 has a lubricating oil suction section channel 81 inside. The bearing housing 4 has a lubricating oil connecting section channel 82 inside. One end of the lubricating oil suction section channel 81 is sealed and connected to the oil inlet of the built-in oil pump 6. The other end of the lubricating oil suction section channel 81 is connected to one end of the lubricating oil connecting section channel 82. The other end of the lubricating oil connecting section channel 82 is connected to the lubricating oil pool. The through shaft 5 is a one-piece rigid shaft. One end of the through shaft 5 horizontally passes through the central shaft hole of the moving disk 3 and the bearing hole on the support bearing seat 4, and extends into the central area of ​​the stationary disk 2 to be coaxially and fixedly connected to the oil pump rotor of the built-in oil pump 6. The other end of the through shaft 5 forms a series connection end, which can be coaxially and rigidly connected to another vortex machine or power machine. A central oil hole 10 is opened axially inside the through shaft 5, and the oil outlet of the built-in oil pump 6 is connected to the inlet of the central oil hole 10. Radial oil outlet holes 11 are provided on the through shaft 5 at the positions of the components that require lubrication.

[0027] In this embodiment, the oil inlet channel is formed by connecting the lubricating oil suction section channel 81 inside the stationary plate 2 and the lubricating oil connecting section channel 82 inside the support bearing seat 4. It can also be connected to the lubricating oil pool through oil pipes or other means.

[0028] In one possible implementation, the central area of ​​the stationary plate 2 has an oil pump mounting cavity, and the built-in oil pump 6 is adapted to be installed in the oil pump mounting cavity; the oil pump housing of the built-in oil pump 6 and the oil pump mounting cavity of the stationary plate 2 are positioned and fitted by a stop or a positioning pin, and a sealing ring is embedded at the mating surface. The oil pump housing and the stationary plate 2 are fastened together to form an integrated stationary plate-oil pump assembly.

[0029] In one possible implementation, the stationary disc 2 is fixed to the inner cavity of the horizontal housing 1 by bolts; the support bearing seat 4 is fitted to the stationary disc 2 and is fastened by high-strength bolts.

[0030] Furthermore, the oil pump housing of the built-in oil pump 6 and the oil pump mounting cavity of the stationary plate 2 are positioned and fitted with a stop or locating pin, and a sealing ring is embedded at the mating surface. The oil pump housing and the stationary plate 2 are tightly connected. The specific method of forming the stationary plate-oil pump integrated assembly can be selected from any of the following according to the actual situation: (1) A ring-shaped stop is machined on the inner wall of the oil pump mounting cavity of the stationary plate 2. The inner diameter and height of the stop are precisely matched with the outer diameter and thickness of the end of the housing of the built-in oil pump 6, and the fitting clearance is controlled at 0.02~0.05mm. The end of the oil pump housing is embedded into the stop to achieve coaxial positioning. A ring-shaped sealing groove is machined on the mating surface of the stop of the stationary plate 2, and an O-ring is embedded (the embedding depth is 70%~80% of the diameter of the sealing ring). After assembly, the sealing ring is squeezed to form a radial seal to prevent lubricating oil leakage.

[0031] (2) Three blind holes (15-25mm deep) are evenly distributed in an equilateral triangle pattern on the inner wall of the oil pump mounting cavity of the stationary plate 2. Corresponding pin grooves are machined on the housing of the internal oil pump 6. A quenched cylindrical positioning pin of No. 45 steel is inserted into the blind hole of the stationary plate, and then the oil pump pin groove is aligned with the positioning pin and inserted to achieve circumferential and coaxial positioning. A sealing groove is machined on the circumferential surface of the oil pump housing, and a Y-shaped sealing ring with the lip facing the lubricating oil side is inserted. The oil pressure is used to make the lip tightly adhere to the inner wall of the mounting cavity to achieve bidirectional sealing.

[0032] (3) A ring-shaped stop is machined in the oil pump mounting cavity of the stationary plate 2, and two locating pin holes are arranged circumferentially at the boss of the stop. An adaptation step and corresponding pin holes are machined at the end of the oil pump housing. During assembly, the locating pins are inserted into the pin holes of the stationary plate, and then the oil pump step is inserted into the stop to achieve a composite positioning of radial limit of the stop and circumferential limit of the locating pin. A sealing groove is machined on the end face of the stop of the stationary plate to insert an O-ring seal, and a shallow groove is machined on the end of the mating surface of the oil pump housing to insert a dustproof ring, forming a combined seal.

[0033] (4) The same stop positioning structure as in method (1) is adopted, and the gap between the step and the stop is controlled at 0.03~0.06mm to achieve coaxial positioning and installation depth limit. The oil seal mounting groove is processed at the opening end of the oil pump mounting cavity of static plate 2, and a nitrile rubber skeleton oil seal (suitable temperature -20℃~120℃) is embedded. The inner ring of the oil seal is attached to the oil pump shell and the outer ring is attached to the inner wall of the mounting groove. It is suitable for working conditions where the oil pump speed is higher than 5000r / min.

[0034] (5) Two symmetrical blind holes are machined at the bottom of the oil pump mounting cavity of stationary plate 2, and tapered pins with a taper of 1:50 are used; corresponding tapered pin holes are machined at the bottom of the oil pump housing. After inserting the tapered pins into the blind holes of stationary plate, the oil pump is pressed into the tapered pins to achieve precise positioning and self-locking. Two to three sealing grooves are machined on the circumferential surface of the oil pump housing, and V-shaped sealing rings with openings facing the oil pressure side are embedded in each groove to form a multi-stage seal.

[0035] (6) Machining a groove-type stop in the oil pump mounting cavity of the stationary plate 2, machining an appropriate boss at the end of the oil pump housing, with a fitting clearance of 0.01~0.03mm (transition fit); grinding the mating surface of the stop before assembly, applying 0.1~0.2mm thick oil-resistant sealant to the bottom surface of the groove, embedding the oil pump boss and waiting for the sealant to cure, embedding an O-ring at the end of the mating surface to form a double seal, suitable for leak-free precision working conditions.

[0036] In the above methods, after the positioning and fitting are completed, the oil pump housing is fastened to the stationary plate 2 by bolts or tight fit; the seals are all made of materials that are resistant to lubricating oil and suitable for the working temperature of the vortex machinery, and the positioning accuracy meets the micron-level assembly requirements and does not affect the connection between the oil inlet channel 8 and the oil pump inlet.

[0037] Furthermore, in one possible implementation, the central region of the stationary disc 2 is provided with an oil pump mounting cavity. The oil pump mounting cavity is machined with the same inner wall structure as the oil pump housing of the built-in oil pump 6. The oil pump rotor of the built-in oil pump 6 is directly assembled in the oil pump mounting cavity, forming an integrated assembly of stationary disc and oil pump rotor, further improving the integration.

[0038] In one possible implementation, the assembly structure of the through shaft can be adapted: The through shaft 5 can pass through the moving plate 3 and the stationary plate 2 in sequence. An independent oil pump seat is set on the exhaust side of the stationary plate 2, and the built-in oil pump 6 is installed on the oil pump seat; or, the built-in oil pump 6 is directly installed on the inside of the end cover of the vortex machine, and the oil pump rotor is coaxially connected with the through shaft 5. Its lubrication and oil supply working principle is the same as the technical solution described above.

[0039] In one possible implementation, the series connection end of the through shaft 5 in this embodiment is rigidly connected to another scroll machine or power machine via a coupling, hydraulic coupling, flange, or spline structure, or by adopting a coaxial direct connection mode. Specific selection depends on the working conditions; the implementation details and applicable scenarios for each connection method are as follows: Coaxial direct connection is suitable for scenarios with stable speed (2000~8000r / min), stable load, coaxiality error ≤0.05mm, and compact installation space, such as series connection of horizontal scroll machinery of the same model, or direct connection of scroll machinery and small motor. The connecting end of the through shaft 5 is directly connected to the shaft end of another device, without additional transmission components, achieving a highly integrated and lossless rigid connection.

[0040] Flange connections are suitable for applications with medium loads, speeds of 1500~6000 r / min, and requiring regular disassembly and maintenance, such as connecting scroll machinery to industrial gearboxes or medium-sized motors. Positioning is aided by the flange stop, and bolt tightening ensures a balance between connection rigidity and ease of maintenance, compensating for minor installation deviations.

[0041] Coupling connections are suitable for scenarios with slight installation deviations (0.05~0.2mm) and minor impacts during operation, such as multi-unit tandem units installed outdoors. Rigid or flexible couplings can be selected; flexible couplings can buffer vibrations, protect the through shaft and bearings, and are suitable for connecting scroll machinery with asynchronous motors and pump bodies.

[0042] Spline connections are suitable for high-speed (≥6000 r / min), high-load applications requiring axial fine-tuning, such as connecting scroll machinery to high-speed motors and precision reducers. The spline joint enables high-precision transmission, compensates for shaft deformation caused by thermal expansion and contraction, and offers strong load-bearing capacity.

[0043] Hydraulic couplings are suitable for heavy-duty applications with large load fluctuations, significant start-up shocks, or frequent start-stop cycles, such as large industrial gas compressor units. By buffering start-up shocks, hydraulic couplings achieve flexible speed matching, protect core components such as through-shafts and bearings, and extend equipment lifespan.

[0044] In this embodiment of the invention, a horizontal scroll machine with a through shaft and a centrally located oil pump is provided. When the oil pump rotor of the built-in oil pump 6 rotates, under the suction action, the lubricating oil in the lubricating oil pool is sequentially drawn into the built-in oil pump 6 through the lubricating oil connecting section channel 82 and the lubricating oil suction section channel 81. After being pressurized by the built-in oil pump 6, the lubricating oil enters the central oil hole 10 of the through shaft 5 through the oil outlet, and then is delivered to the part that needs lubrication through the radial oil outlet hole 11 to achieve forced lubrication. The lubricated oil flows back to the lubricating oil pool, forming a closed lubrication cycle.

[0045] Among them, the components that need lubrication include the main bearing 7 and the moving plate base bearing 9. One end of the through shaft 5 passes horizontally through the central shaft hole of the moving plate 3, the bearing hole of the main bearing 7 on the support bearing seat 4 and the bearing hole of the moving plate base bearing 9, extends into the oil pump mounting cavity in the center of the stationary plate 2, and is coaxially and fixedly connected with the oil pump rotor of the built-in oil pump 6. Furthermore, the main bearing 7 is fixed on the supporting bearing seat 4, and one end of the through shaft 5 horizontally passes through the bearing hole of the main bearing 7. The main bearing 7 supports the through shaft 5, ensuring the stability of the horizontal rotation of the through shaft 5. The moving plate bearing 9 is fixed on the bottom plate of the moving plate 3, and one end of the through shaft 5 horizontally passes through the bearing hole on the moving plate bearing 9, cooperating with the moving plate 3. With the drive of the through shaft 5, it ensures that the moving plate 3 achieves revolution and translation, while also providing auxiliary support for the through shaft 5.

[0046] In one possible implementation, a filter assembly for filtering impurities in the lubricating oil is provided in the lubricating oil sump, and the filter assembly is located at one end of the lubricating oil connecting section 82 that is connected to the lubricating oil sump.

[0047] The filter assembly can be fixed to the bottom of the lubricating oil sump using an embedded structure, or it can be detachably connected to the oil inlet end of the lubricating oil connecting section channel 82. Its filter port is aligned with the inlet of the lubricating oil connecting section channel 82 to ensure that all lubricating oil entering the oil inlet channel can be filtered, which is suitable for the static disc-oil pump integrated structure and the need for precise lubrication of this application.

[0048] Another embodiment of the present invention provides a lubrication method for a horizontal scroll machine with a through shaft and a built-in oil pump at the center of the stationary disc, which mainly includes the following steps: A horizontal scroll machine is rigidly connected to other scroll machines or power machines via a through shaft 5. The drive shaft 5 rotates, which in turn drives the moving disk 3 to revolve around the stationary disk 2, causing the volute teeth of the moving disk 3 and the stationary disk 2 to mesh and form a continuous change in the closed cavity, thus completing the compression or expansion process of the medium. At the same time, the drive shaft 5 drives the oil pump rotor of the built-in oil pump 6, which is fixed in the central area of ​​the stationary disk 2, to rotate, triggering the suction and pressurization actions of the built-in oil pump 6. Under the action of the built-in oil pump 6, the lubricating oil is drawn from the lubricating oil pool at the bottom of the horizontal housing 1, flows through the lubricating oil connecting section channel 82 opened on the support bearing seat 4 and the lubricating oil suction section channel 81 opened on the stationary plate 2, and enters the oil inlet of the built-in oil pump 6. The high-pressure lubricating oil, after being pressurized by the built-in oil pump 6, enters the central oil hole 10 of the through shaft 5 from the oil outlet of the built-in oil pump 6, and then is delivered to the part that needs lubrication through the preset radial oil outlet hole 11 on the through shaft 5 to achieve forced lubrication. The lubricating oil after lubrication flows back to the lubricating oil pool to form a closed lubrication cycle.

[0049] In one possible implementation, multiple horizontal scroll machines connected in series via a through shaft 5 utilize the same built-in oil pump 6 for forced lubrication. This eliminates the need for additional transmission components, enabling coaxial series operation of multiple scroll machines. Furthermore, all series-connected units share a single lubrication system comprised of the built-in oil pump and the through shaft's oil circuit, ensuring uniformity in lubrication parameters across all units.

[0050] This invention fully utilizes the structural space of the stationary disc by integrating the built-in oil pump into the center space of the stationary disc, eliminating the traditional external oil pump and external lubrication oil pipeline, significantly reducing the number of parts and leakage points, and making the lubrication system highly integrated with the main unit, resulting in a smaller overall size and more compact layout; at the same time, it can realize the integrated processing of stationary disc and oil pump.

[0051] On the other hand, the independent sealed oil inlet channel, which is formed by the static plate and the support bearing housing, and the built-in oil pump rotates synchronously with the through shaft, can achieve forced pressure oil supply. Even under low speed conditions, it can still ensure a stable oil supply, which can achieve precise oil supply to each lubrication part and greatly improve lubrication reliability.

[0052] In addition, the integrated through-shaft structure allows for direct coaxial rigid connection with another vortex machine or power machine without the need for additional transmission components, significantly improving the coaxiality and synchronization of multiple machines in series. Furthermore, the series units can share a single lubrication system, simplifying the structural design of multi-stage units and reducing manufacturing costs and control complexity.

[0053] Meanwhile, the lubrication system adopts a closed-loop design, allowing the lubricating oil to be reused and reducing lubricating oil consumption; and the forced pressure oil supply precisely matches the needs of each lubrication part, avoiding energy waste caused by excessive oil supply, thus balancing lubrication effect and energy saving.

[0054] Finally, it should be noted that the above embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit it. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical details; and these modifications, changes, or substitutions 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, and should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A horizontal scroll machine with a through shaft and a built-in oil pump at the center of the stationary disc, characterized in that, The system includes a horizontal housing (1), a stationary disc (2), a moving disc (3), a support bearing seat (4), a through shaft (5), and a built-in oil pump (6). The bottom of the horizontal housing (1) is provided with a closed lubricating oil pool. The stationary disc (2) is fixed in the inner cavity of the horizontal housing (1), and the built-in oil pump (6) is installed in the center area of ​​the stationary disc (2). The oil pump rotor of the built-in oil pump (6) is coaxially connected with the through shaft (5). The moving disc (3) is installed on the through shaft (5). When the through shaft (5) rotates, it drives the moving disc (3) to revolve around the stationary disc (2) to complete the compression process of the medium, and at the same time drives the oil pump rotor of the built-in oil pump (6) to rotate. The support bearing seat (4) is in close contact with the end face of the stationary disc (2). The interior of the stationary disc (2) is provided with a lubricating oil suction section channel (81), and the interior of the support bearing seat (4) is provided with a lubricating oil connecting section channel (82). One end of the through shaft (5) is sealed and connected to the oil inlet of the built-in oil pump (6), and the other end of the lubricating oil suction section channel (81) is connected to one end of the lubricating oil connecting section channel (82), and the other end of the lubricating oil connecting section channel (82) is connected to the lubricating oil pool; the through shaft (5) is an integral rigid shaft body, one end of the through shaft (5) horizontally passes through the central shaft hole of the moving plate (3) and the bearing hole on the bearing seat (4), and extends into the central area of ​​the stationary plate (2) and is coaxially fixedly connected to the oil pump rotor of the built-in oil pump (6); the other end of the through shaft (5) forms a series connection end, which can be coaxially rigidly connected with another vortex machine or power machine; a central oil hole (10) is opened in the through shaft (5) along the axial direction, and the oil outlet of the built-in oil pump (6) is connected to the inlet of the central oil hole (10); radial oil outlet holes (11) are opened on the through shaft (5) corresponding to the parts that need to be lubricated.

2. The horizontal scroll machine with a through shaft and a built-in oil pump at the center of the stationary disc as described in claim 1, characterized in that, The central area of ​​the stationary plate (2) is provided with an oil pump mounting cavity, and the built-in oil pump (6) is adapted to be installed in the oil pump mounting cavity; the oil pump housing of the built-in oil pump (6) and the oil pump mounting cavity of the stationary plate (2) are positioned and matched by a stop or positioning pin, and a sealing ring is embedded at the mating surface. The oil pump housing and the stationary plate (2) are tightly connected to form an integrated stationary plate-oil pump assembly.

3. The horizontal scroll machine with a through shaft and a built-in oil pump at the center of the stationary disc as described in claim 1, characterized in that, The central area of ​​the stationary disc (2) is provided with an oil pump mounting cavity. The oil pump mounting cavity is machined with the same inner wall structure as the oil pump housing of the built-in oil pump (6). The oil pump rotor of the built-in oil pump (6) is directly assembled in the oil pump mounting cavity to form an integrated assembly of stationary disc and oil pump rotor.

4. The horizontal scroll machine with a through shaft and a built-in oil pump at the center of the stationary disc as described in claim 1, characterized in that, The exhaust side of the static plate (2) is provided with a separate independent oil pump seat, and the built-in oil pump (6) is installed on the oil pump seat; Alternatively, the built-in oil pump (6) can be installed directly on the inside of the end cap of the horizontal housing (1).

5. The horizontal scroll machine with a through shaft and a built-in oil pump at the center of the stationary disc as described in claim 1, characterized in that, The series connection end of the through shaft (5) is connected to another vortex machine or power machine through a coupling, hydraulic coupling, flange or spline structure, or by adopting a coaxial direct connection mode.

6. The horizontal scroll machine with a through shaft and a built-in oil pump at the center of the stationary disc as described in claim 1, characterized in that, When the rotor of the built-in oil pump (6) rotates, under the suction action, the lubricating oil in the lubricating oil pool is sucked into the built-in oil pump (6) through the lubricating oil connecting section channel (82) and the lubricating oil suction section channel (81) in sequence. After being pressurized by the built-in oil pump (6), the lubricating oil enters the central oil hole (10) of the through shaft (5) through the oil outlet, and then is transported to the part that needs to be lubricated through the radial oil outlet (11) to achieve forced lubrication. The lubricating oil after lubrication flows back to the lubricating oil pool to form a closed lubrication cycle.

7. The horizontal scroll machine with a through shaft and a built-in oil pump at the center of the stationary disc as described in claim 1 or 6, characterized in that, The components requiring lubrication include the main bearing (7) and the moving plate base bearing (9). The main bearing (7) is fixed on the support bearing seat (4), and one end of the through shaft (5) passes horizontally through the bearing hole of the main bearing (7). The main bearing (7) supports the through shaft (5). The moving plate bearing (9) is fixed at the bottom plate of the moving plate (3). One end of the through shaft (5) passes horizontally through the bearing hole on the moving plate bearing (9) and cooperates with the moving plate (3). With the drive of the through shaft (5), the moving plate (3) is ensured to achieve revolution and translation, while also providing auxiliary support for the through shaft (5).

8. The horizontal scroll machine with a through shaft and a built-in oil pump at the center of the stationary disc as described in claim 1, characterized in that, The lubricating oil tank is equipped with a filter assembly for filtering impurities in the lubricating oil. The filter assembly is located at one end of the lubricating oil connecting section (82) that is connected to the lubricating oil tank.

9. A lubrication method for a horizontal scroll machine with a through shaft and a built-in oil pump at the center of the stationary disc, characterized in that, include: A horizontal scroll machine is coaxially rigidly connected to other scroll machines or power machines via a through shaft (5). The drive shaft (5) rotates, and the drive shaft (5) drives the moving disk (3) to revolve around the stationary disk (2), so that the volute teeth of the moving disk (3) and the stationary disk (2) mesh to form a continuous change of the closed cavity, thus completing the compression or expansion process of the medium; at the same time, the drive shaft (5) drives the oil pump rotor of the built-in oil pump (6) fixed in the central area of ​​the stationary disk (2) to rotate, triggering the suction and pressurization action of the built-in oil pump (6); Under the action of the built-in oil pump (6), the lubricating oil is sucked in from the lubricating oil pool at the bottom of the horizontal housing (1), flows through the lubricating oil connecting section channel (82) opened on the support bearing seat (4) and the lubricating oil suction section channel (81) opened on the stationary plate (2), and enters the oil inlet of the built-in oil pump (6). The high-pressure lubricating oil, after being pressurized by the built-in oil pump (6), enters the central oil hole (10) of the through shaft (5) from the oil outlet of the built-in oil pump (6), and then is delivered to the part that needs lubrication through the radial oil outlet (11) preset on the through shaft (5) to achieve forced lubrication. The lubricating oil after lubrication flows back to the lubricating oil pool to form a closed lubrication cycle.

10. The lubrication method for a horizontal scroll machine with a through shaft and a built-in oil pump at the center of the stationary disc according to claim 9, characterized in that, Multiple horizontal scroll machines connected in series via a through shaft (5) use the same built-in oil pump (6) for forced lubrication.

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