Compressor apparatus

Abstract

The embodiment of the utility model relates to compressor equipment, which comprises a compressor head, an air inlet, a compressed air outlet and an air outlet. The driving motor is provided with a shell and a motor inner cavity in the shell, an air inlet hole is formed in one side of the outer wall of the shell, an oil gas discharge hole is formed in the other side, opposite to the side, of the outer wall, and the air inlet hole and the oil gas discharge hole both communicate with the motor inner cavity; the oil-gas separator is provided with an oil-gas inlet and a gas outlet, the compressed gas exhaust port is in fluid communication with the oil-gas inlet through a pipeline, and the gas outlet is in fluid communication with the gas inlet hole of the driving motor through a pipeline, so that compressed gas is introduced into the inner cavity of the motor; and an oil gas discharge hole of the driving motor is communicated with a gas inlet of the compressor head through a pipeline. According to the compressor equipment disclosed by the invention, the oil leaked into the inner cavity of the motor is discharged from the inner cavity of the motor by using the compressed gas, so that the mechanical loss is reduced, and the service life of the motor is prolonged.

Description

Technical Field

[0001] This application relates to the field of compressors, and more specifically, to a compressor device. Background Technology

[0002] Oil-cooled motors are increasingly being used in the current industrial compressor market. The cooling oil comes from the compressor system's own oil and cooler, which can improve the motor's cooling performance and eliminate the need for separate cooling components for the motor.

[0003] Most motors on the market are equipped with shaft seals to prevent bearing lubricating oil from entering the motor. However, as the motor operates for longer periods, the aging of the shaft seals can cause some lubricating oil to enter the motor cavity through the gap between the bearing housing and the drive shaft. This lubricating oil needs to be drained from the motor cavity in a timely manner; otherwise, the accumulated leaked lubricating oil will increase mechanical wear and reduce the motor's lifespan. Utility Model Content

[0004] This disclosure provides a compressor device with a special oil drainage design, which prevents excessive lubricating oil from entering the motor cavity without the need for a shaft seal, and fully utilizes the high-pressure gas generated by the compressor itself to discharge the lubricating oil from the motor cavity. This solves the problem of motor shaft seal aging and prevents lubricating oil accumulation in the motor cavity, effectively extending the motor's service life.

[0005] The compressor device disclosed herein includes: a compressor head having a gas inlet and a compressed gas exhaust port; a drive motor having a housing and a motor cavity inside the housing, an air inlet provided on one side of the outer wall of the housing, and an oil and gas exhaust port provided on the opposite side of the outer wall, both the air inlet and the oil and gas exhaust port communicating with the motor cavity; and an oil and gas separator having an oil and gas inlet and a gas outlet, wherein the compressed gas exhaust port is fluidly connected to the oil and gas inlet via a pipeline, and the gas outlet is fluidly connected to the air inlet of the drive motor via a pipeline to introduce compressed gas into the motor cavity; the oil and gas exhaust port of the drive motor is connected to the gas inlet of the compressor head via a pipeline.

[0006] The compressor equipment provided in this application has the following advantages over the prior art:

[0007] (1) Compressed gas is used to discharge the oil that has leaked into the motor cavity from the motor cavity, which reduces mechanical loss and extends the service life of the motor;

[0008] (2) By setting an annular groove on the inner side of the rotor shaft near the bearing support position, the use of shaft seal is omitted. When the rotor shaft rotates at high speed, the oil flowing through the annular groove moves towards the outer side of the corresponding bearing in the axial direction under the action of centrifugal force, which further reduces the amount of oil leaking into the motor cavity.

[0009] (3) By setting a cooling oil passage inside the motor housing and a cooling oil branch outlet connected to the cooling oil passage, and connecting the cooling oil branch outlet to the lubricating oil passage set on the end cover on one side of the motor, the cooling oil can be introduced into the bearing on that side for lubrication. The lubricated oil is discharged into the gear transmission device and then discharged into the compressor head through the oil return hole on the compressor head, so as to achieve recycling. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. Where appropriate, the same reference numerals are used in all drawings to refer to the same or similar parts. Such embodiments are illustrative and are not intended to be exhaustive or exclusive embodiments of this device or method. In the drawings:

[0011] Figure 1 This is a top view of the structure of a compressor device according to an embodiment of the present disclosure;

[0012] Figure 2 This is a schematic diagram of the structure of a compressor device according to an embodiment of the present disclosure, wherein the compressor head, gear transmission device, drive motor, and control components are arranged along... Figure 1 The cross-sectional view taken by the BB line is shown;

[0013] Figure 3 According to the embodiments of this disclosure Figure 2 An enlarged schematic diagram of region A in the diagram;

[0014] Figure 4 This is a schematic diagram of the gear transmission device, drive motor, and control assembly according to an embodiment of the present disclosure, wherein the gear transmission device and drive motor are shown in cross-sectional view;

[0015] Figure 5 This is a schematic diagram of the structure of the cooling oil passages inside the housing according to an embodiment of the present disclosure after being unfolded;

[0016] Figure 6 According to the embodiments of this disclosure Figure 4 An enlarged schematic diagram of region E in the diagram;

[0017] Figure 7This is a schematic diagram of the oil and gas flow path according to an embodiment of the present disclosure. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the described embodiments of this application without creative effort are within the scope of protection of this application.

[0019] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0020] To keep the following description of the embodiments of this application clear and concise, detailed descriptions of known functions and known components are omitted.

[0021] This application uses a horizontally arranged compressor device as an example for illustration, and does not imply that the technical solutions provided in the embodiments of this application cannot be used on compressor devices with other arrangement methods (such as vertically arranged compressor devices). As long as the technical solution is within the scope of the description in this application, it falls within the protection scope of this application.

[0022] Figure 1 A schematic diagram of the compressor device provided in an embodiment of this disclosure is shown. Figure 1 As shown, the compressor device 10 may include a compressor head 100, a gear transmission device 200, a drive motor 300, and an oil-gas separator 400. The gear transmission device 200 serves as a transmission mechanism connecting the compressor head 100 and the drive motor 300 to transmit the torque from the drive motor 300 to the compressor head 100, thereby compressing and discharging the gas. The oil-gas separator 400 connects to the compressor head 100 via pipelines (…). Figure 1 (Not shown in the image) is connected to the compressor head 100 and the drive motor 300.

[0023] In addition, the drive motor 300 is also connected to the control component 500 (such as... Figure 1 and Figure 2 As shown, the control component 500 is used to receive commands to control the operation of the drive motor 300. Its specific structure and control mechanism will not be described in detail here.

[0024] Unlike existing compressor equipment, the compressor equipment 10 provided in this application does not have shaft seals at both ends of the drive shaft of the drive motor 300 to avoid leakage problems caused by the aging of the shaft seals over time. In order to solve the problem of increased motor mechanical losses caused by oil leakage into the motor cavity without shaft seals, the oil-gas separator 400 included in the compressor equipment 10 of this application can introduce high-pressure compressed gas into the drive motor 300, thereby discharging the leaked oil from the motor cavity.

[0025] Specifically, such as Figure 2 As shown, the drive motor 300 has a housing 310 and a motor cavity 320 located inside the housing 310, on one side of the outer wall of the housing 310 (in Figure 2 An air inlet 311 is provided on the upper side of the outer wall, and on the opposite side of the outer wall (in the middle). Figure 2 The lower part of the motor is provided with an oil and gas discharge hole 312. Both the air inlet 311 and the oil and gas discharge hole 312 are connected to the inner cavity 320 of the motor. The oil and gas separator 400 includes an oil and gas inlet 410, a gas outlet 420 and an oil outlet 430. It can be used to separate the oil and gas mixture added from the oil and gas inlet 410 into oil and compressed gas (i.e., high-pressure gas) with a certain pressure (higher than atmospheric pressure). The gas discharged from the gas outlet 420 is divided into two paths. One path is supplied to the customer's gas end through the customer's gas pipeline 421, and the other path is fluidly connected to the air inlet 311 of the drive motor 300 through the external pipeline 422. Most of the compressed gas from the oil-gas separator 400 is discharged through the customer's gas pipeline 421 for external use. A small portion of the compressed gas can enter the motor cavity 320 through the external pipeline 422 via the air inlet 311, filling the motor cavity 320 with compressed gas. This creates a pressure difference between the motor cavity 320 and the external environment, thereby discharging the oil that has leaked into the motor cavity 320 along with the compressed gas through the oil-gas discharge hole 312, thus cleaning the oil that has leaked into the motor cavity 320.

[0026] The relative positions of the air inlet 311 and the oil / gas outlet 312 on the housing 310 should, in principle, satisfy the following requirement: the height of the air inlet 311 should be higher than the height of the oil / gas outlet 312. That is, in the vertical direction, the air inlet 311 should be above the oil / gas outlet 312. Regardless of whether the compressor is horizontally or vertically positioned, the oil / gas outlet 312 should be located at the lower bottom of the housing 310. This allows the oil in the motor cavity to flow into the oil / gas outlet 312 both under air pressure and under gravity. Figure 2 As shown in the embodiment, the air inlet 311 is located at the top of the housing 310, and the oil and gas outlet 312 is located at the bottom of the housing 310.

[0027] In addition, since there are no shaft seals at both ends of the rotor shaft 340 (described later) of the drive motor 300, the motor cavity 320 and the space of the first bearing 350A and the second bearing 350B at both ends and the outer space of the bearings are connected. The compressed gas entering the motor cavity 320 makes the gas pressure in the motor cavity 320 greater than the pressure of the bearings at both ends and the space outside the bearings. On the one hand, this can further reduce the leakage of lubricating oil from the bearings at both ends into the motor. On the other hand, it also facilitates the flow of lubricating oil from the bearings at both ends to their respective oil passages downstream, ensuring the smooth flow of lubricating oil.

[0028] In addition, such as Figure 2As shown, the compressor head 100 may be provided with a gas inlet 110, a compressed gas exhaust port 120, and an oil injection port 130. The compressed gas exhaust port 120 is fluidly connected to the oil-gas inlet 410 of the oil-gas separator 400 through a pipeline, and the oil injection port 130 is fluidly connected to the oil outlet 430 of the oil-gas separator 400 to receive a portion of the oil from the oil-gas separator 400. The gas for compression (generally at atmospheric pressure, such as air) enters the interior of the compressor head 100 from the gas inlet 110. Under the action of the compressor rotor (not shown in the figure), the gas is compressed to a specific pressure and then discharged from the compressed gas exhaust port 120. The gas inlet 110 is also fluidly connected to the oil and gas discharge port 312 of the drive motor 300 via a pipeline, allowing the mixture of oil and compressed gas passing through the oil and gas discharge port 312 under the pressure of compressed gas to enter the compressor head 100 through the gas inlet 110. Finally, along with the compressed gas and the oil already inside the compressor head, it flows from the compressor head 100 through the compressed gas exhaust port 120 and the connected oil and gas inlet 410 into the oil and gas separator 400 for oil and gas separation. On the one hand, the pressure of the gas inlet 110 is generally the ambient atmospheric pressure, which is lower than the pressure of the high-pressure gas separated from the oil and gas separator 400. This creates a stable pressure difference between the air inlet 311 of the motor housing 310 and the oil and gas discharge port 312, facilitating the smooth discharge of oil from the motor housing through the oil and gas discharge port 312. On the other hand, this oil is reused in the compressor cycle, reducing waste. Moreover, these oils enter the compression chamber from the gas inlet 110 of the compressor and are sprayed directly onto the outer surface of the screw rotor opposite to the gas inlet 110, which can improve the lubrication and cooling effect of this part of the screw rotor.

[0029] Preferably, such as Figure 2 As shown, in order to efficiently clean the oil in the motor cavity 320 using compressed gas, the air inlet 311 and oil-gas outlet 312 on the housing 310 of the drive motor 300 can be respectively located at both ends in the axial direction of the housing 310. For example, the air inlet 311 and the oil-gas outlet 312 can be respectively located at the end of the housing 310 away from the gear transmission device 200. Figure 1 The middle part is the left end) and the end near the gear transmission device 200 ( Figure 1 (The middle part is the right end), so that the compressed gas introduced from the air inlet 311 can fully "purge" the oil in the motor cavity 320 along approximately the entire axial length of the housing 310, further improving the cleaning efficiency.

[0030] Of course, the arrangement of the air inlet 311 and the oil and gas outlet 312 can also be the same as... Figure 2Conversely, as shown, the air inlet 311 and the oil and gas outlet 312 are respectively located at one end of the housing 310 near the gear transmission device 200 and the other end away from the gear transmission device 200.

[0031] In an embodiment, the drive motor 300 may further include a stator 330 arranged in the motor cavity 320, a rotor including a rotor shaft 340, and a first bearing 350A and a second bearing 350B for supporting the two ends of the rotor shaft 340. The stator 330 includes a first segment 331, a second segment 332 and a third segment 333 arranged sequentially along the axial direction. That is, the second segment 332 is located in the middle of the stator 330, and the first segment 331 and the third segment 333 are located at both ends of the stator 330. The gap between the second segment 332 and the inner wall of the housing 310 is smaller than the gap between the first segment 331 and the third segment 333 and the inner wall of the housing 310. That is, the stator 330 is generally thick in the middle and thin at both ends. The stator 330 is arranged axially in the motor cavity 320. The second section 332 is typically, for example, a silicon steel lamination area, whose outer surface is basically cylindrical. The gap between it and the inner wall of the housing 310 is very small, so gas and oil cannot pass smoothly through the silicon steel lamination area. Therefore, it is preferable to set the air inlet 311 and the oil and gas outlet 312 in the area of ​​the housing 310 that avoids the area corresponding to the second section 332 of the stator 330, that is, in the area of ​​the housing 310 that corresponds to the first section 331 or the second section 333 of the stator 330.

[0032] In an embodiment, such as Figure 2 As shown, an oil collecting groove 360 ​​is also provided at the bottom of the inner wall of the housing 310. The bottom wall of the groove is connected to the oil and gas discharge hole 312 on the housing 310. Under high pressure, the oil inside the motor cavity 320 can collect in the oil collecting groove 360 ​​and further flow into the oil and gas discharge hole 312. Optionally, the oil collecting groove 360 ​​corresponds to the second section 332 of the stator 330, and the length of the oil collecting groove 360 ​​along the axial direction of the housing is greater than the length of the second section 332.

[0033] In addition, such as Figure 2 As shown, the drive motor 300 may further include a first end cover 370 and a second end cover 380. The first end cover 370 and the second end cover 380 are respectively fixed at both ends of the housing 310, so that the first end cover 370, the second end cover 380 and the housing 310 together form the motor cavity 320 of the drive motor 300. The first bearing 350A and the second bearing 350B are respectively fixedly installed in the first end cover 370 and the second end cover 380. The end of the rotor shaft 340 passes through the first bearing 350A and the second bearing 350B supported on the first end cover 370 and the second end cover 380, thereby supporting the rotor shaft 340.

[0034] No seals are provided between the rotor shaft 340 and the first end cover 370, or between the rotor shaft 340 and the second end cover 380; that is, no shaft seals are provided at either end of the rotor shaft 340.

[0035] Among them, such as Figure 2 and Figure 4 As shown, the first end cover 370 also forms part of the housing of the gear transmission device 200. The end of the rotor shaft 340 near the compressor head 110 passes through the first bearing 350A and extends into the inner cavity of the first end cover 370 (i.e., the gear transmission device 200), where it meshes with the gear assembly to transmit torque. With this configuration, oil flowing into the first bearing 350A for lubrication and cooling can pass through the first end cover 370 into the gear transmission device 200.

[0036] As mentioned above, the high-pressure gas entering the motor cavity can, to some extent, inhibit the lubricating oil in the first bearing 350A and the second bearing 350B from entering the motor cavity. In a preferred embodiment, to further reduce the amount of oil leaking into the motor cavity 320 and reduce the burden on the compressed gas in the oil-gas separator 400 for cleaning the oil, a first annular groove 341A and a second annular groove 341B are respectively formed on the inner side of each of the two ends of the rotor shaft 340 in the axial direction near the support position of the first bearing 350A and the second bearing 350B, along the circumferential direction of the rotor shaft. That is, the first annular groove 341A and the second annular groove 341B are located between the first bearing 350A and the second bearing 350B. Figure 3 The structure and location of the second annular groove 341B are schematically shown. The shape of this annular groove is designed so that during the rotation of the rotor shaft 340, the oil flowing through the first annular groove 341A and the second annular groove 341B can move outward in the axial direction of the corresponding first bearing 350A and second bearing 350B under the action of centrifugal force, thereby preventing most of the oil from entering the motor cavity 320.

[0037] Therefore, in the compressor device 10 provided in this application, the use of annular groove design eliminates the need for shaft seals and also prevents a large amount of oil from entering the motor cavity 320, thus solving the problem of short motor life caused by shaft seal aging in the prior art. At the same time, this application introduces compressed gas from the oil-gas separator 400 into the motor cavity 320, further discharging the small amount of oil leaked into the motor cavity 320 in a timely manner, thus solving the technical problem in the prior art where oil used for lubrication / cooling leaks into the motor cavity 320, causing significant mechanical damage.

[0038] like Figure 2As shown, a first lubricating oil passage 381 is provided in the second end cover 380 on the left side. The first lubricating oil passage 381 includes an oil inlet 382 and an oil outlet 383. The oil inlet 382 is fluidly connected to the oil outlet 430 of the oil-gas separator 400 through a pipeline to receive oil from the oil outlet 430 of the oil-gas separator 400. This part of the oil passes through the second bearing 350B corresponding to the second end cover 380, thereby lubricating the second bearing 350B and then being discharged from the oil outlet 383. The oil outlet 383 is fluidly connected to an opening (not shown in the figure) on the side of the housing of the gear transmission device 200 through a pipeline to discharge a part of the oil into the inner cavity of the gear transmission device 200 (or the first end cover 370), thereby continuing to lubricate the gear assembly in the inner cavity of the gear transmission device 200. Because the opening is located at a certain height on the side of the housing of the gear transmission device 200, rather than at the bottom, it ensures that oil from the second end cover 380 can smoothly enter the inner cavity of the gear transmission device 200 (if the opening were located at the bottom, the oil already present at the bottom would create significant resistance, preventing the oil in the second end cover 380 from draining smoothly), and the incoming oil can effectively lubricate the gear assembly. Furthermore, an oil return hole 140 is provided on the compressor head 100, through which the compressor head 100 is in fluid communication with the inner cavity of the gear transmission device 200, allowing oil from the gear transmission device 200 to enter the compressor head 100. Finally, the oil from the gear transmission device 200, along with the oil entering the compressor head 100 through the oil injection port 130, is discharged through the compressed gas exhaust port 120 and enters the oil-gas separator 400 for further separation.

[0039] On the one hand, as described above, the second bearing 350B corresponding to the second end cover 380 is lubricated by providing a first lubrication channel 381 in the second end cover 380 of the drive motor 300.

[0040] On the other hand, the following will combine Figures 4 to 6 The lubrication of the first bearing 350A corresponding to the first end cover 370 is described in detail.

[0041] like Figure 4 As shown, a cooling oil channel 390 is provided inside the wall of the housing 310 of the drive motor 300. Specifically, the cooling oil channel 390 consists of multiple S-shaped cooling sections (such as...) arranged in series along the circumference of the housing 310. Figure 5As shown, it consists of a cooling oil passage inlet 391 and a cooling oil passage outlet 392. Cooling oil from the outside enters the cooling oil passage through the cooling oil passage inlet 391, cools the motor while flowing in the cooling oil passage 390, and then flows out of the cooling oil passage 390 through the cooling oil passage outlet 392. On the surface of the housing 310, the cooling oil passage inlet 391 and the cooling oil passage outlet 392 can be seen to be positioned close to each other.

[0042] like Figure 4 As shown, as part of the cooling oil passage 390, a cooling oil branch outlet 393 is also provided at one end of the housing 310 near the gear transmission device 200. This cooling oil branch outlet 393 is connected to one of the cooling sections of the cooling oil passage 390. Additionally, at least one oil drain hole 371 is provided in the first end cover 370 of the drive motor 300 (e.g., ...). Figure 6 As shown in the diagram, a second lubrication passage 372 is provided. At least one drain hole 371 is positioned opposite the support position between the first bearing 350A corresponding to the first end cap 370 and the corresponding end of the rotor shaft 340. The second lubrication passage 372 has an oil inlet 372A and an oil outlet 372B. The oil inlet 372A is aligned with the cooling oil branch outlet 393, allowing oil to enter the oil inlet 372A from the cooling oil branch outlet 393. The oil outlet 372B is in fluid communication with at least one drain hole 371, so that a portion of the cooling oil in the cooling oil passage 390 can flow into the first bearing 350A corresponding to the first end cap 370 for lubrication via the cooling oil branch outlet 393 and the second lubrication passage 372. The size of the oil inlet 372A is much smaller than the size of the cooling oil branch outlet 393, so that a small portion of the cooling oil inside the housing enters the second lubrication oil passage 372 through the oil inlet 372A to lubricate and cool the first bearing 350A, while most of the cooling oil still circulates in the wall of the motor housing. This ensures the lubrication and cooling effect of the first bearing 350A, and does not affect the cooling effect of the motor due to the reduction of cooling oil.

[0043] In a preferred embodiment, such as Figure 6 As shown, the first end cover 370 of the drive motor 300 has two parallel oil drain holes 371. The design of the two oil drain holes 371 can increase the flow rate of lubricating oil when both are working at the same time, and when one of them is blocked, the other oil drain hole 371 can input lubricating oil into the first bearing 350A, reducing the probability of lubrication circuit failure.

[0044] The above text combined Figures 1 to 6 The specific structure of the compressor device 10 provided in the embodiments of this disclosure is described in detail below. Figure 7The flow path of oil and gas during the operation of the compressor device 10 of this application is described in detail, wherein the flow path of oil is represented by a solid line with an arrow and the flow path of compressed gas is represented by a dashed line with an arrow.

[0045] like Figure 7 As shown, on one hand, the oil-gas separator 400 separates the incoming oil-gas mixture into oil and compressed gas. A portion of the oil is introduced into the second end cover 380 of the drive motor 300 via the oil outlet 430 along path ①, and lubricates the second bearing 350B corresponding to the second end cover 380 through the first lubricating oil passage 381. A small portion of the lubricating oil leaks into the motor cavity 320, while most of the lubricating oil enters the inner cavity of the gear transmission device 200 through the opening on the housing of the gear transmission device 200 along path ②, lubricating the internal gear assembly. On the other hand, the oil-gas separator 400 introduces a portion of the separated compressed gas into the motor cavity 320 along path ③ via the air inlet 311, "blowing away" the small portion of lubricating oil that also enters the motor cavity 320, and forming an oil-gas mixture with it. Together, the mixture is introduced into the gas inlet 110 of the compressor head 100 through the oil-gas outlet 312 along path ④, entering the interior of the compressor head 100, thereby completing the cleaning of the lubricating oil that has leaked into the motor cavity 320. In addition, externally added cooling oil can be used to cool the first end cover 370 through the cooling oil passage 390. Part of the cooling oil enters the second lubrication oil passage 372 from the cooling oil branch outlet 393 and lubricates the first bearing 350A corresponding to the first end cover 370 through the oil drain hole 371. This part of the oil, together with the oil that enters the inner cavity of the gear transmission device 200 through path ②, enters the compressor head 100 through the oil return hole 140. In addition, another part of the oil separated from the oil-gas separator 400 can enter the compressor head 100 through the oil injection port 130 through path ⑤ for lubrication. Subsequently, this part of the lubricating oil, together with the oil-gas mixture introduced through path ④ and the oil introduced through the oil return hole 140, enters the oil-gas separator 400 through path ⑥ from the compressed gas exhaust port 120 of the compressor head 100 for re-separation and recycling.

[0046] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of disclosure in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

[0047] Furthermore, although the operations are described in a specific order, this should not be construed as requiring these operations to be performed in the specific order shown or in a sequential order. Multitasking and parallel processing may be advantageous in certain environments. Similarly, while several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of this invention. Certain features described in the context of individual embodiments may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented individually or in any suitable sub-combination in multiple embodiments.

[0048] Although the subject matter has been described using language specific to structural features and / or methodological logic, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. Rather, the specific features and actions described above are merely illustrative examples of implementing the claims.

[0049] The foregoing has described in detail several embodiments of this application, but this application is not limited to these specific embodiments. Those skilled in the art can make various variations and modifications based on the concept of this application, and all such variations and modifications should fall within the scope of protection claimed in this application.

Claims

1. A compressor device, characterized in that, include: The compressor head has a gas inlet and a compressed gas outlet; A drive motor has a housing and a motor cavity inside the housing. An air inlet is provided on one side of the outer wall of the housing, and an oil / gas outlet is provided on the opposite side of the outer wall. Both the air inlet and the oil / gas outlet communicate with the motor cavity. An oil-gas separator has an oil-gas inlet and a gas outlet. The compressed gas exhaust port is fluidly connected to the oil-gas inlet through a pipeline, and the gas outlet is fluidly connected to the air inlet of the drive motor through a pipeline to introduce compressed gas into the inner cavity of the motor. The oil and gas discharge port of the drive motor is connected to the gas inlet of the compressor head through a pipeline.

2. The compressor equipment according to claim 1, characterized in that, The air inlet and the oil / gas outlet are located at opposite ends in the axial direction of the housing; in the vertical direction, the air inlet is located above the oil / gas outlet.

3. The compressor equipment according to claim 2, characterized in that, The drive motor also includes a gear transmission device, which is disposed between the drive motor and the compressor head; The oil and gas discharge port is located at one end of the housing near the gear transmission device, and the air inlet port is located at the opposite end of the housing away from the gear transmission device.

4. The compressor equipment according to claim 3, characterized in that, The drive motor further includes a stator arranged in the motor cavity, a rotor including a rotor shaft, and a first bearing and a second bearing respectively for supporting the two ends of the rotor shaft; the drive motor further includes a first end cover and a second end cover respectively fixed to the two ends of the housing, the first end cover, the second end cover and the housing together forming the motor cavity of the drive motor; the first bearing is fixedly installed in the first end cover and the second bearing is fixedly installed in the second end cover.

5. The compressor equipment according to claim 4, characterized in that, The stator includes a first section, a second section, and a third section arranged sequentially along the axial direction, wherein the gap between the second section and the inner wall of the housing is smaller than the gaps between the first section and the third section and the inner wall of the housing; and The air inlet and the oil / gas outlet are respectively located in the regions of the housing corresponding to the first segment and the third segment, or the air inlet and the oil / gas outlet are respectively located in the regions of the housing corresponding to the third segment and the first segment.

6. The compressor equipment according to claim 5, characterized in that, An oil-collecting groove is provided at the bottom of the inner wall of the housing. The oil-collecting groove is arranged opposite to the second section and the bottom wall of the oil-collecting groove is connected to the oil and gas discharge hole. The length of the oil-collecting groove along the axial direction is greater than the length of the second section. The air inlet is provided at the top of the housing.

7. The compressor equipment according to claim 4, characterized in that, A first annular groove is provided on the outer surface of the rotor shaft located inside the first end cover, and a second annular groove is provided on the outer surface of the rotor shaft located inside the second end cover. In the axial direction of the rotor shaft, the first annular groove and the second annular groove are located between the first bearing and the second bearing. Both the first annular groove and the second annular groove are opened along the circumferential direction of the rotor shaft. The shape and structure of the first annular groove and the second annular groove are such that during the rotation of the rotor shaft, the oil flowing through the first annular groove and the second annular groove can move outward in the axial direction of the first bearing and the second bearing respectively under the action of centrifugal force.

8. The compressor equipment according to claim 4, characterized in that, A first lubricating oil passage is provided in the second end cap, the first lubricating oil passage comprising: An oil inlet, which is in fluid communication with the oil-gas separator via a pipeline, is provided to receive oil from the oil-gas separator to lubricate and cool the second bearing; and An oil drain port is connected to the gear transmission device via a pipeline to drain oil that lubricates and cools the second bearing into the gear transmission device.

9. The compressor equipment according to claim 4, characterized in that, Cooling oil channels are provided inside the wall of the housing, and the cooling oil channels have branch outlets for cooling oil. At least one oil drain hole is provided in the first end cover, and the at least one oil drain hole is positioned directly opposite the first bearing. A second lubricating oil passage is provided in the first end cover, and the oil inlet of the second lubricating oil passage is aligned with the cooling oil branch outlet, so that the cooling oil inside the wall of the housing can enter the oil inlet from the cooling oil branch outlet. The oil outlet of the second lubricating oil passage is in fluid communication with the at least one oil drain hole, so that a portion of the cooling oil in the cooling oil passage can flow into the first bearing for lubrication and cooling via the cooling oil branch outlet and the second lubricating oil passage.

10. The compressor device according to claim 9, characterized in that, The first end cap has two parallel oil drain holes; the size of the oil inlet is smaller than the size of the cooling oil branch outlet.

11. The compressor equipment according to claim 9, characterized in that, The first end cap forms part of the housing of the gear transmission device, and the oil that flows into the first bearing for lubrication and cooling flows into the gear transmission device through the first end cap.

12. The compressor equipment according to any one of claims 3-11, characterized in that, The compressor head also includes: An oil return port, through which the compressor head is in fluid communication with the gear transmission device to receive oil from the gear transmission device; and An oil injection port is in fluid communication with the oil-gas separator to receive a portion of the oil from the oil-gas separator.

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