Single-source double-head compressor and installation method

Abstract

This invention relates to the technical field of compressors, specifically to a single-source dual-head compressor and its installation method. The compressor comprises two compressor heads and a drive source connected between their opposite ends. Each compressor head employs a screw-type compression structure, with separate working chambers for the two compressor heads. The drive source is suspended in the air. It includes a drive housing, a stator body housed within the drive housing, and a rotor body, with a power shaft sleeve on the rotor body. Each compressor head has an independent screw shaft. A first integral part and a second integral part are interlocked. The compressor head on the mounting side, along with its rotor body, is fitted into the stator body, while the screw shaft on the pre-positioning side is interlocked and circumferentially limited to the second end of the power shaft sleeve. This design offers the following advantages: it eliminates the need for couplings, optimizing connection convenience while maintaining coaxiality.

Description

Technical Field

[0001] This invention relates to the technical field of compressors, and more specifically, to a single-source dual-head compressor and its installation method. Background Technology

[0002] Screw compressors are core equipment in the gas compression field. A typical screw compressor structure mainly consists of a compressor main unit and a drive motor, with the motor outputting power to drive the compressor main unit to complete the gas compression operation. Currently, the industry commonly uses couplings to connect the motor drive shaft and the compressor main unit's drive shaft, which directly increases the overall axial length of the unit. Simultaneously, to ensure stable power output and avoid transmission vibration, abnormal noise, and wear, the motor drive shaft and the compressor main unit's drive shaft must maintain high-precision coaxiality. Therefore, during equipment assembly, the shaft alignment of the motor, coupling, and compressor main unit must be completed simultaneously, making the assembly process cumbersome and the debugging difficult. Furthermore, due to the large size and weight of the screw compressor main unit, to ensure overall assembly stability and structural flatness, the enlarged intermediate connecting parts also require maintaining the coaxiality and motion stability of each component.

[0003] Under high-pressure gas compression conditions, single-stage screw compressors have significant limitations. Firstly, the compression ratio of a single stage is limited, failing to meet the requirements for high-pressure gas preparation. Secondly, using single-stage compression under high-pressure conditions leads to a substantial increase in compression power consumption and significant heat generation, resulting in high energy consumption, high heat dissipation pressure, and a high risk of the compressed medium temperature exceeding limits and accelerated wear of equipment components, making it extremely uneconomical and impractical. Therefore, multi-stage compression structures are commonly used in high-pressure gas compression operations, with two-stage screw air compressors being the mainstream equipment in the industry.

[0004] The working principle of a two-stage screw air compressor is as follows: After being purified by an air filter, ambient air enters the first-stage compression chamber, where it mixes with lubricating oil to complete the initial compression and increase the pressure to the interstage pressure. The oil-gas mixture after the first stage compression is introduced into the cooling channel, where it undergoes heat exchange through full contact with a large amount of oil mist, rapidly reducing the gas compression temperature rise. The cooled low-pressure gas then re-enters the second-stage rotor compression chamber to complete the secondary pressurization, ultimately reaching the preset high-pressure exhaust standard.

[0005] Traditional two-stage screw air compressors typically use two independent motors to drive the primary and secondary compressor units respectively, in order to meet the requirements of two-stage compression operations. While the dual-motor drive structure can stably complete two-stage compression operations, it significantly increases the overall length of the unit and the floor space required. The equipment has a lengthy structure, low integration, and high installation space requirements, making it difficult to adapt to small and medium-sized installation scenarios, resulting in poor equipment adaptability.

[0006] To address the issue of the bulky size of dual-motor compressor units, existing technologies have introduced integrated solutions using a single motor to drive two-stage compression. For example, Chinese patent application CN105626530A discloses a water-lubricated, oil-free, medium-pressure, two-stage single-screw air compressor. This compressor includes an electric motor, a primary single-screw compressor, and a secondary single-screw compressor, all connected to the electric motor. The screw shaft of the primary single-screw compressor is connected to the front shaft of the electric motor via a primary connecting sleeve, and the screw shaft of the secondary single-screw compressor is connected to the rear shaft of the electric motor via a secondary coupling. However, because the motor shafts are connected to both the low-pressure and high-pressure air compressors, the drive shafts at both ends of the motor are easily damaged during actual operation, rendering it impractical. Summary of the Invention

[0007] 1. The technical problem that the invention aims to solve The purpose of this invention is to achieve synchronous motion of two-stage compression driven by a single drive source and to improve the stability of power transmission.

[0008] 2. Technical Solution To achieve the above objectives, in a first aspect, the technical solution provided by the present invention is: a single-source dual-head compressor, comprising two compressor heads, a drive source connected between opposite ends of the compressor heads, wherein the compressor heads adopt a screw-type compression structure, the drive source is used to drive the two compressor heads to compress air simultaneously, and the working chambers of the two compressor heads are separated. The drive source is suspended in the air; the drive source includes a drive housing, a stator body disposed within the drive housing, and a rotor body for cooperating with the stator body, the rotor body having a power shaft sleeve; Each compressor head has an independent screw shaft. One end of the screw shaft is fitted with the internal structure of the compressor head to compress air, and the other end of the screw shaft is used to extend into the drive housing and connect with the power shaft sleeve. The compressor head is provided with a radially extending docking shell at its end. The drive housing and stator body are first connected to one of the docking shells to form a first integral unit. The side of the compressor head where the docking shell is located is the pre-positioning side, and the other side is the mounting side. The power bushing has two through ends, namely a first end and a second end. The first end is close to the mounting side, and the second end is close to the prepositioning side. The first end of the power bushing is connected to the screw shaft located on the mounting side. A fixing member is inserted into the second end of the power bushing. The fixing member makes the power bushing axially fixed to the end of the screw shaft on the mounting side. The rotor body and the compressor head on the mounting side form a second integral unit. The first and second integral parts are inserted into each other, and the compressor head on the mounting side, along with the rotor body, is fitted into the stator body. At the same time, the screw shaft on the prepositioning side is inserted and circumferentially limited to the second end of the power shaft sleeve.

[0009] Through the above technical solution, a single-drive-source, bidirectional-drive, dual-compressor head structure replaces the traditional two-stage compressor dual-motor independent drive structure and the existing single-motor two-end direct-drive structure. On the one hand, it abandons the traditional coupling-connected transmission method, eliminates a large number of connecting and supporting components, effectively shortens the axial length of the unit, significantly reduces the equipment footprint, improves equipment integration, and adapts to various small installation scenarios, solving the defects of the traditional dual-motor two-stage compressor structure being lengthy and having poor space adaptability. On the other hand, the drive source is arranged entirely in a suspended manner, combined with a built-in plug-in transmission structure of the dual screw shaft and the power shaft sleeve, avoiding the problems of the exposed shafts at both ends of the motor bearing pressure separately and uneven high and low pressure loads in existing patents, avoiding eccentric wear and breakage of the drive shaft, fundamentally improving the operational stability and service life of the equipment. At the same time, the whole machine adopts a modular plug-in assembly structure, eliminating the need for complex coaxial calibration of the motor, coupling, and main unit, simplifying the assembly process, reducing the difficulty of equipment debugging, and enabling the dual compressor heads to operate synchronously, stably achieving two-stage gas compression, meeting the requirements of high-pressure gas compression conditions, reducing energy consumption and heat generation in high-pressure compression operations, and improving the economy of high-pressure compression.

[0010] Preferably, when the second end of the power bushing is connected to the screw shaft on the prepositioning side, the radially extending portion of the mating shell synchronously closes the drive housing.

[0011] Through the above technical solution, the cooperation between the first and second integral parts can achieve shaft fit during installation, as well as concentricity fit, and can also seal the inside of the drive housing.

[0012] Preferably, when the first integral and the second integral are connected to form a complete machine, the axes of the two screw shafts and the power bushing are located on the same straight line, and the distance between the opposite ends of the two screw shafts is less than the length of the power bushing.

[0013] The above technical solution ensures that the twin-screw shaft and the power bushing are arranged coaxially, with the distance between the ends of the two screw shafts being less than the length of the power bushing. This allows the power bushing to fully cover the transmission docking area of ​​both screw shafts. This guarantees uniform force distribution and consistent coaxiality at both compressor heads, completely resolving the core defects of existing single-motor two-end drive schemes, such as uneven high and low pressure loads and damage from overload on one side of the shaft. Simultaneously, the coaxial integrated transmission structure significantly reduces transmission losses, improves power transmission efficiency, reduces energy consumption and heat generation under high-pressure compression conditions, and enhances the overall working efficiency and service life of the equipment.

[0014] Preferably, after the two ends of the power bushing are fitted with the screw shafts, there is a hollow section in the middle of the power bushing. The hollow section is located between the shaft ends of the two screw shafts, and there is a heat dissipation gap between the end of the rotor body and the mating shell.

[0015] With the above technical solution, compared to the physical contact between the screw shaft and the power bushing, heat tends to flow more towards the two ends of the rotor body, that is, closer to the heat dissipation gap. To better guide heat transfer, the inner diameter of the middle part of the power bushing is larger, resulting in less solid material in the middle section, which facilitates heat flow towards both ends. The heat dissipation gap is directly connected to the inner wall of the drive housing. During the rotation of the rotor body, heat will flow towards the inner wall of the drive housing, improving the heat dissipation effect, rather than accumulating in the middle. Of course, this is on the premise that the inside of the drive housing is sealed by the mating shell, so that the gas flows only towards the inner wall of the drive housing.

[0016] Preferably, the two ends of the drive housing are supported on the outer wall of the compressor head by a mating shell.

[0017] Through the above technical solution, the drive housing is suspended and fixed by the docking shells of the compressor heads on both sides, eliminating the need for additional auxiliary support structures such as motor support seats and unit support bases. This significantly reduces the number of unit parts, simplifies the overall structure, and lowers equipment production costs. It also completely solves the problems of cumbersome assembly and difficulty in controlling flatness caused by traditional equipment relying on bottom support seats for leveling and support. By relying on the compressor heads at both ends to support the drive source, the force is symmetrical and uniform, effectively ensuring the coaxial accuracy of the drive source and the compressor heads at both ends, avoiding transmission vibration and abnormal noise during equipment operation, and improving power transmission stability.

[0018] Preferably, the end of the drive housing has a clearance space, the clearance space has a radial extension distance, and the radial extension length of the clearance space is not less than the inner diameter length of the stator body; The second assembly is embedded into the drive housing through the clearance space.

[0019] The above technical solution provides ample space for the second integral unit with the rotor, avoiding collisions and interference between the stator, rotor, and shaft structures during assembly. This significantly reduces the difficulty of equipment assembly and improves assembly tolerance and efficiency. Simultaneously, the clearance space accommodates the integral embedding of the rotor, ensuring coaxial assembly accuracy between the rotor and stator. This avoids transmission eccentricity and accelerated wear caused by assembly deviations, guaranteeing stable power output from the drive source and adapting to continuous compression operations under high-pressure conditions.

[0020] Preferably, when the first integral and the second integral are engaged, after the second end of the power bushing is circumferentially engaged with the screw shaft located on the prepositioning side, the mating shell and the drive housing located on the mounting side are engaged and installed through the relative rotation of the power bushing.

[0021] The above technical solution eliminates the need for precise manual alignment and calibration; assembly and fitting can be completed simply by the structure's own rotational adaptation. This eliminates the complex process of aligning the three components of a traditional compressor, greatly simplifying the overall assembly process, reducing manual adjustment costs and assembly errors. Simultaneously, the rotational adaptation assembly method ensures a tight fit and precise alignment of the mating structures, guaranteeing the coaxiality of the entire machine, effectively suppressing transmission vibrations during operation, and improving motion stability.

[0022] Preferably, the radial extension length of the docking shell is greater than the radial extension length of the drive shell, the end of the drive shell is limited to one side of the docking shell, and a limit ring is provided on the compressor head, which is limited to the other side of the docking shell. The drive shell, docking shell, and limit ring form an axial positioning.

[0023] The above technical solution utilizes the mutual limiting and cooperation of the drive housing, docking housing, and limiting ring to form a stable axial positioning structure, achieving bidirectional axial limiting and fixation of the entire machine. This effectively restricts the axial movement of the drive housing, compressor head, and shaft structure during equipment operation, solving the problems of component loosening and coaxiality misalignment that occur after long-term operation of traditional multi-stage compressors, and continuously ensuring the transmission accuracy and structural stability of the entire machine. Furthermore, the integrated limiting structure eliminates the need for additional fasteners, resulting in a simpler structure, further improving equipment integration, and reducing the probability of failure.

[0024] Preferably, the power shaft of the dual-head compressor has two first bearings located at both ends and two second bearings located in the middle. The two second bearings are located inside or near the corresponding docking shell, and the power shaft sleeve rotates through the two second bearings.

[0025] The above technical solution provides comprehensive and stable support for the power shaft sleeve. Compared to traditional two-end bearing support structures, the central bearing effectively counteracts the radial force and deformation generated by the shaft during high-pressure compression, suppresses shaft sway and eccentric vibration, and continuously ensures the motion accuracy and coaxiality of the power shaft. This solves the problems of severe shaft wear, abnormal transmission noise, and poor stability associated with long-term operation of traditional compressors, making it suitable for continuous high-pressure, high-load compression conditions, significantly reducing equipment failure rates, and extending the overall service life of the machine.

[0026] To achieve the above objectives, in a second aspect, the technical solution provided by the present invention is: a method for installing a single-source dual-head compressor, based on the above-mentioned single-source dual-head compressor, comprising: S1: Connect the drive housing and the stator body to one of the docking housings, with the compressor head where this docking housing is located being the pre-positioning side, to form a first integral unit; S2: Connect the power shaft sleeve to the docking housing on the other side. The compressor head where this docking housing is located is the mounting side, forming a second integral unit; S3: The first and second integral parts are installed together, the compressor head with rotor body on the installation side is fitted into the stator body, and the screw shaft on the prepositioning side is inserted and circumferentially limited to the power shaft sleeve.

[0027] 3. Beneficial effects Compared with the prior art, the technical solution provided by this invention has the following advantages: (1) In this invention, the traditional connection method of power transmission between the motor shaft and the coupling is eliminated. The screw shaft of the compressor head is extended into the drive housing, so that the drive source can drive two compressor heads at the same time. This structure eliminates the need for an additional motor and shortens the axial distance compared to the exposed coupling, making the two-stage compressor structure more compact.

[0028] (2) One reason for using an external coupling is to achieve the connection between the two ends of a machine. Moreover, the connection of three shafts can only be achieved by using a coupling. In this application, the docking shell makes the drive source and the compressor heads on both sides form an integrated machine structure. Part of the compressor head structure will form a structure located inside the drive source. Through the docking shells at both ends of the drive housing, the two screw shafts are connected coaxially, optimizing the connection convenience while maintaining coaxiality.

[0029] (3) The whole machine adopts a modular plug-in assembly structure, which eliminates the need for complex coaxial calibration of the motor, coupling and main unit, simplifying the assembly process and reducing the difficulty of equipment debugging.

[0030] (4) During the plug-in installation process, the drive housing is closed simultaneously, and the screw shafts at both ends of the power shaft sleeve are connected. Heat tends to flow to both ends of the rotor body, which is closer to the heat dissipation gap. In order to better guide the heat transfer, the inner diameter of the middle part of the power shaft sleeve is larger, making the middle part less solid and more convenient to flow to both ends. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the present invention.

[0032] Figure 2 This is a partial internal structure diagram of the present invention.

[0033] Figure 3 This is a partial exploded view of the present invention.

[0034] Figure 4 for Figure 2 Enlarged view of section A in the middle.

[0035] Figure 5 for Figure 2 Enlarged view of section B.

[0036] Explanation of reference numerals in the attached figures: 100. Drive source; 110. Stator body; 120. Rotor body; 121. Power shaft sleeve; 122. Hollow part; 123. Fixing bolt; 124. Spacer block; 125. First end; 126. Second end; 200. Drive housing; 210. Clearance space; 220. Heat dissipation gap; 230. Cooling channel; 300. Compressor head; 310. Docking housing; 320. Screw shaft; 332. Second bearing; 340. Limiting ring; 400. First whole; 410. Pre-positioning side; 500, Second integral; 510, Installation side. Detailed Implementation

[0037] To further understand the content of this invention, please refer to the accompanying drawings. Figure 1-5 The present invention will be described in detail with reference to the embodiments.

[0038] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0039] A single-source dual-head compressor includes a drive source 100 and compressor heads 300 disposed at both ends of the drive source 100. The drive source 100 provides power during operation, and the compressor heads 300 adopt a screw-type compression structure. The drive source 100 enables the compressor heads 300 at both ends to perform air compression.

[0040] The drive source 100 includes a stator body 110, a rotor body 120, and a drive housing 200. The stator body 110 is installed on the inner wall of the drive housing 200, and the rotor body 120 is fitted into the stator body 110. The rotor body 120 and the stator body 110 can be detached, meaning the rotor body 120 can be axially inserted into the stator body 110. Specifically, it is installed from the end of the drive housing 200 inwards, and the axial position of the rotor body 120 can be adjusted according to actual conditions. The outer side of the rotor body 120 does not actually contact the inner side of the stator body 110; this is only for illustration. The fit between the stator body 110 and the rotor body 120 can be a conventional three-phase asynchronous motor structure or a permanent magnet motor structure; the latter allows for a shorter layout space.

[0041] The drive source 100 has compressor heads 300 at both ends, and each compressor head 300 has a screw shaft 320. The two screw shafts 320 are independently set. One end of the screw shaft 320 cooperates with the internal structure of the compressor head 300 to compress air, and the working chambers of the two compressor heads 300 are independently separated.

[0042] In some embodiments, the two ends of the drive source 100 are identical screw compressors, or in other embodiments, one end is a single-screw compressor and the other end is a twin-screw compressor, forming a combination of low-pressure and high-pressure compressors. Generally, the working chambers within the compressor heads 300 on both sides remain independent. However, typically, the compressor heads 300 at both ends of the drive housing 200 are different, resulting in different screw shafts 320 at both ends. This difference may be in length or thickness, and the two screw shafts 320 must be separate and independent, not the same shaft. It is worth noting that, to ensure reliable connection between the screw shafts 320 and the rotor body 120, in this embodiment, the distance between the ends of the two screw shafts 320 is less than the length of the stator body 110.

[0043] The compressor head 300 has a docking shell 310 at its housing end, which extends radially. Specifically, the docking shell 310 can be integrally formed on the outer wall of the compressor head 300 end or it can be separately formed on the compressor head 300 end. Taking the docking shell 310 as a separate form as an example, the middle of the docking shell 310 has a space for the compressor head 300 end to be inserted. When the docking shell 310 is connected to the drive housing 200, the docking shell 310, the drive housing 200, and the outer wall of the compressor head 300 are directly connected to form a supporting shell, thereby allowing the drive source 100 to be suspended in the air, with the compressor heads 300 at both ends serving as support points.

[0044] Two docking shells 310 are first installed on the corresponding compressor head 300. One of the docking shells 310 is first connected to one end of the drive housing 200. At this time, the stator body 110 is connected together to form the first whole 400. The compressor head 300 side where this docking shell 310 is located is the prepositioning side 410.

[0045] In this embodiment, a rotor body 120 is disposed inside the drive housing 200. The rotor body 120 is provided with a power bushing 121 located at the rotation axis. Both ends of the power bushing 121 are through, namely a first end 125 and a second end 126. The other side relative to the prepositioning side 410 is the mounting side 510. The screw shaft 320 of the mounting side 510 is connected to the inner wall of the first end 125 of the power bushing 121 by a single key, forming a circumferential limit. The axial connection is completed by a fixing member. The fixing member is a fixing bolt 123. A pad 124 is provided inside the power bushing 121. The fixing bolt 123 is inserted through the second end 126, passes through the pad 124, and is threadedly connected to the end of the screw shaft 320. The rotor body 120 and the compressor head 300 of the mounting side 510 form a second integral 500. In this embodiment, the distance between the shaft ends of the two screw shafts 320 is also less than the length of the power bushing 121.

[0046] Preferably, the first integral 400 and the second integral 500 are then inserted together. At this time, the compressor head 300 on the mounting side 510, along with the rotor body 120, will be inserted into and fitted into the stator body 110. At this time, the second end 126 of the power shaft sleeve 121 will be inserted into the screw shaft 320 located on the prepositioning side 410 and circumferentially limited.

[0047] During the insertion process, the radially extending portion of the synchronous docking shell 310 synchronously closes the drive shell 200.

[0048] The docking shell 310 has a radial extension length greater than that of the drive shell 200. The end of the drive shell 200 is confined to one side of the docking shell 310. A limiting ring 340 is provided on the compressor head 300, which is confined to the other side of the docking shell 310. The drive shell 200, the docking shell 310, and the limiting ring 340 form an axial positioning. The end of the drive shell 200 has a clearance space 210 with a radial extension distance. The radial extension length of the clearance space 210 is not less than the inner diameter of the stator body 110. When the first integral 400 and the second integral 500 are inserted, the second integral 500 is embedded into the drive shell 200 through the clearance space 210.

[0049] After assembly, the drive housing 200, docking housing 310, and compressor head 300 form a common support frame. The portions of the compressor heads 300 located outside the drive housing 200 on both sides serve as two support ends, and the outer walls of the compressor heads 300 are supported by the inner sides of the docking housing 310. This eliminates the need for the supporting connectors in the middle drive housing 200, allowing the entire drive housing 200 to be suspended in mid-air. Simultaneously, the dual-head compressor's power shaft has two first bearings (not shown in the figure) located at both ends, and two second bearings 332 located in the middle. These second bearings 332 are located inside or near the corresponding docking housing 310, and the power shaft sleeve 121 rotates via these two second bearings 332. This eliminates the need for additional bearings (previously, one bearing was required at the end of the screw shaft 320, and another bearing was needed at the extended end of the rotor body 120), effectively sharing a bearing between the end of the screw shaft 320 and the rotor body 120, further shortening the axial length.

[0050] Furthermore, since the end of the compressor head 300 extends into the drive housing 200, the bearing lubrication can rely on the lubricating oil circulating within the compressor head 300 itself, eliminating the need to add additional lubricant to the bearings at both ends of the drive housing 200. Simultaneously, after prolonged use, there is a possibility of leakage of the lubricating oil within the compressor head 300 through the connection between the compressor head 300 and the screw shaft 320. When the lubricating oil flows into the drive housing 200, it is caught by the drive housing 200. In conventional structures, the lubricating oil would leak to the outside, requiring timely cleaning to prevent contamination. In this embodiment, however, the lubricating oil flows into the drive housing 200 without overflowing, providing a certain degree of lubrication for the rotor 120. When there is excessive lubricating oil, it can be periodically cleaned by opening the drive housing 200.

[0051] Furthermore, in this embodiment, both the stator body 110 and the rotor body 120 are coated with rubber to prevent oil leakage from affecting the stator body 110 and the rotor body 120 inside the drive housing 200.

[0052] The compressor head 300 is a screw compressor. If the thread surface of the corresponding screw is polarized along the axial direction during rotation, since one end of the power bushing 121 is fixed to the screw shaft 320 and the other end is inserted into another screw shaft 320, it can move a certain distance in the axial direction. That is, the gap between the ends of the two screw shafts 320 can be set to vary along the axial length (only within the normal range of movement). This change will occur during the compression operation, so it can adapt to the situation of compressor heads 300 with different ends.

[0053] Since one end of the screw shaft 320 is inserted into the power bushing 121, if there is axial polarization, this gap ensures that the screw shafts 320 on both sides do not affect each other. Simultaneously, when the docking shell 310 docks with the drive housing 200, this gap also provides operating space for the operator. There is a gap between the end of the power bushing 121 where it is inserted into the screw shaft 320 and the docking shell 310. In some embodiments, when the first integral 400 and the second integral 500 are engaged, after the second end 126 of the power bushing 121 circumferentially aligns with the screw shaft 320 located on the prepositioning side 410, the docking shell 310 and the drive housing 200 are fitted together through the relative rotation of the screw shaft 320 and the power bushing 121.

[0054] The screw shaft 320 is connected to the power sleeve 121 of the rotor body 120. This can be understood as the screw shaft 320 being directly connected to the rotor body 120. Here, "direct connection" refers to the method where the connecting shaft of the rotor body 120 extends outwards and is then connected to the screw shaft 320 via a coupling. In contrast, the rotor body 120 has no connecting shaft and no extra bearing structure, thus enabling the two screw shafts 320 and the rotor body 120 to be coaxially arranged via the power sleeve 121, and ensuring that the power transmission path from the rotor body 120 to the screw shaft 320 is entirely within the integrated machine.

[0055] The drive housing 200 has cooling channels 230 within its shell wall. These channels 230 are used to circulate a cooling medium. In some embodiments, the drive housing 200 also has inlet and outlet channels for circulating the cooling medium, which can be cooling oil. The cooling channels 230 within the drive housing 200 can be spiral-shaped or multiple individual annular structures. Alternatively, the drive housing 200 can be configured as two half-shells, or the cooling channels 230 can be arranged axially. However, generally speaking, the axial extension of the cooling channels 230 needs to be sufficiently long, at least covering a portion of the rotor body 120 along its axial length. In this embodiment, the cooling channels 230 extend spirally, thus completely covering the rotor body 120 except for both ends of the drive housing 200, allowing for cooling and heat dissipation.

[0056] There is a heat dissipation gap 220 between the end of the rotor body 120 and the docking shell 310. In fact, when the screw shaft 320 is embedded in the power shaft sleeve 121, there is a hollow part 122 in the middle section of the power shaft sleeve 121, which is filled with air. Compared with the solid contact between the screw shaft 320 and the power shaft sleeve 121, the heat tends to flow to the two ends of the rotor body 120, that is, closer to the heat dissipation gap 220.

[0057] Furthermore, to better guide heat transfer, after the screw shaft 320 is inserted into both ends of the power sleeve 121, the inner diameter of the middle part of the power sleeve 121 is larger, resulting in less solid material in the middle part and facilitating heat flow towards both ends. The heat dissipation gap 220 is directly connected to the inner wall of the drive housing 200. During the rotation of the rotor body 120, heat will flow towards the inner wall of the drive housing 200, improving heat dissipation rather than accumulating in the middle. Of course, this is on the premise that the inside of the drive housing 200 is sealed by the mating shell 310, so that the gas can only flow towards the inner wall of the drive housing 200.

[0058] Furthermore, since both ends of the actual drive housing 200 are connected to the compressor head 300, continuing to use an end-mounted cooling fan structure would have the following drawbacks: if a fan is placed at one end, the heat dissipation effect at the other end would be poor, resulting in a significant difference in cooling effect between the two ends; if a symmetrical structure is formed, there would be at least two cooling fan structures located at the ends, and the overall length would still be relatively long. Moreover, since there are connecting parts at both ends, the original cooling fan structure might interfere with airflow; and if a fan is only placed between the two connecting ends, the cooling effect would not meet the requirements since the heat dissipation has already doubled.

[0059] Furthermore, the fans need to rotate synchronously, which inevitably has a radial impact during rotation. Additionally, after prolonged use, some fan blades may have impurities, causing radial imbalance during rotation. Moreover, since the rotor body 120 in this embodiment needs to have screw shafts 320 at both ends, and the compressor heads 300 at both ends are of different types, the influence of the cooling fan on its rotation shaft is amplified.

[0060] In this embodiment, by providing a cooling channel 230 within the drive housing 200, axial full-coverage cooling can be achieved without interfering with the movement of the internal rotor 120. During cooling, if temperature changes cause deformation of the drive housing 200, the spiral-shaped cooling channel 230 in this embodiment will cause axial "expansion" of the drive housing 200. This deformation is not significant and generally occurs at the beginning of the cooling cycle. The end of the screw shaft 320 can adapt to this axial deformation by deforming, for example, by deforming the pad 124 or by the spline's axial adaptation movement. Therefore, a more efficient cooling effect is achieved without any movement obstruction due to deformation.

[0061] Furthermore, based on the aforementioned fit between the screw shaft 320 and the power bushing 121, and the arrangement at both ends of the drive housing 200, the compressor heads 300 at both ends can serve as the main support points. The middle portion of the drive housing 200, due to its length variation and the presence of the docking shell 310 and the ends of the compressor heads 300, does not require additional support and can remain suspended. This also avoids the hollow drive housing 200 directly serving as a support point, which could cause deformation of the internal cooling channel 230, affecting the flow of cooling oil. Simultaneously, when the docking shell 310 and the drive housing 200 are separate, the supporting force will not directly act on the drive housing 200, further reducing the impact on the drive housing 200.

[0062] A method for installing a single-source dual-head compressor, based on the aforementioned single-source dual-head compressor, includes: S1: First connect the drive housing 200 and the stator body 110 to one of the docking housings 310. The compressor head 300 where this docking housing 310 is located is the prepositioning side 410, forming a first integral 400. S2: Connect the power shaft sleeve 121 to the docking shell 310 on the other side. The compressor head 300 where this docking shell 310 is located is the mounting side 510, forming a second integral 500. S3: The first integral 400 and the second integral 500 are installed together. The compressor head 300 of the mounting side 510 with the rotor body 120 is fitted into the stator body 110. At the same time, the screw shaft 320 of the prepositioning side 410 is inserted and circumferentially limited to the power shaft sleeve 121.

[0063] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited to this. It is worth noting that the various embodiments are not completely independent; they are combined together to express the technical solution as a whole. Furthermore, provided that the various embodiments do not conflict technically, the various technical features can be combined without exceeding the scope of this application. Therefore, if those skilled in the art, inspired by this description, design similar structures and embodiments without departing from the spirit of the invention, they should all fall within the protection scope of this invention.

Claims

1. A single-sourced double-headed compressor, characterized by: It includes two compressor heads (300) and a drive source (100) connected between opposite ends of the compressor heads (300). The compressor heads (300) adopt a screw-type compression structure. The drive source (100) is used to drive the two compressor heads (300) to compress air simultaneously. The working chambers of the two compressor heads (300) are separated. The drive source (100) is suspended; the drive source (100) includes a drive housing (200), a stator body (110) disposed in the drive housing (200), and a rotor body (120) for cooperating with the stator body (110), the rotor body (120) having a power shaft sleeve (121). Each compressor head (300) has an independent screw shaft (320). One end of the screw shaft (320) is engaged with the internal structure of the compressor head (300) to compress air, and the other end of the screw shaft (320) is used to extend into the drive housing (200) and be connected with the power bushing (121). The compressor head (300) is provided with a radially extending docking shell (310) at its end. The drive housing (200) and the stator body (110) are first connected to one of the docking shells (310) to form a first integral (400). The side of the compressor head (300) where the docking shell (310) is located is the prepositioning side (410), and the other side is the mounting side (510). The power bushing (121) has two through ends, namely a first end (125) and a second end (126). The first end (125) is close to the mounting side (510), and the second end (126) is close to the prepositioning side (410). The first end (125) of the power bushing (121) is connected to the screw shaft (320) located on the mounting side (510). A fixing member is inserted into the second end (126) of the power bushing (121). The fixing member makes the power bushing (121) axially fixed to the end of the screw shaft (320) on the mounting side (510). The rotor body (120) and the compressor head (300) on the mounting side (510) form a second integral (500). The first integral (400) and the second integral (500) are inserted into each other. The compressor head (300) of the mounting side (510) along with the rotor body (120) is fitted into the stator body (110). At the same time, the screw shaft (320) of the positioning side (410) is inserted and circumferentially limited to the second end (126) of the power shaft sleeve (121).

2. A single-sourced double-headed compressor according to claim 1, characterized in that: When the second end (126) of the power bushing (121) and the screw shaft (320) of the prepositioning side (410) are connected, the radially extending portion of the mating shell (310) simultaneously closes the drive housing (200).

3. A single-sourced double-headed compressor according to claim 1, characterized in that: When the first integral (400) and the second integral (500) are connected to form a whole machine, the axes of the two screw shafts (320) and the power bushing (121) are on the same straight line, and the distance between the opposite ends of the two screw shafts (320) is less than the length of the power bushing (121).

4. A single-sourced double-headed compressor according to claim 3, characterized in that: After the two ends of the power bushing (121) are fitted with the screw shaft (320), there is a hollow part (122) in the middle of the power bushing (121). The hollow part (122) is located between the shaft ends of the two screw shafts (320), and there is a heat dissipation gap (220) between the end of the rotor body (120) and the mating shell (310).

5. A single-sourced double-headed compressor as claimed in claim 1, characterized in that: The two ends of the drive housing (200) are supported on the outer wall of the compressor head (300) by the docking housing (310).

6. A single-sourced double-headed compressor as claimed in claim 2, characterized in that: The end of the drive housing (200) has a clearance space (210), the clearance space (210) has a radial extension distance, and the radial extension length of the clearance space (210) is not less than the inner diameter length of the stator body (110); The second unit (500) is embedded into the drive housing (200) through the clearance space (210).

7. A single-sourced double-headed compressor as claimed in claim 1, characterized in that: When the first integral (400) and the second integral (500) are engaged, the second end (126) of the power bushing (121) is circumferentially engaged with the screw shaft (320) located on the prepositioning side (410), and the mating installation of the mating shell (310) and the drive housing (200) located on the mounting side (510) is achieved by the relative rotation of the power bushing (121).

8. A single-source dual-head compressor according to claim 2, characterized in that: The radial extension length of the docking shell (310) is greater than that of the drive shell (200). The end of the drive shell (200) is limited to one side of the docking shell (310). A limiting ring (340) is provided on the compressor head (300). The limiting ring (340) is limited to the other side of the docking shell (310). The drive shell (200), docking shell (310), and limiting ring (340) form an axial positioning.

9. A single-source dual-head compressor according to claim 1, characterized in that: The dual-head compressor has two first bearings at both ends on its power shaft and two second bearings (332) in the middle. The two second bearings (332) are located inside or near the corresponding docking shell (310) respectively. The power shaft sleeve (121) rotates through the two second bearings (332).

10. A method for installing a single-source dual-head compressor, characterized in that: Based on the single-source dual-head compressor as described in any one of claims 1-9, comprising: S1: First connect the drive housing (200) and the stator body (110) to one of the docking housings (310), and the compressor head (300) where this docking housing (310) is located is the prepositioning side (410) to form a first integral (400). S2: Connect the power shaft sleeve (121) to the docking shell (310) on the other side, where the compressor head (300) where the docking shell (310) is located is the mounting side (510), forming a second integral (500). S3: The first integral (400) and the second integral (500) are installed together. The compressor head (300) of the mounting side (510) with the rotor body (120) is fitted into the stator body (110). At the same time, the screw shaft (320) of the positioning side (410) is inserted and circumferentially limited to the power shaft sleeve (121).

Images