Integrated air-cooled screw compressor

Abstract

The utility model discloses an integrated air-cooled screw compressor. The screw compressor comprises an air compression assembly, a driving assembly, an air inlet assembly and a variable frequency speed regulation assembly. The driving assembly is arranged on the right side of the air compression assembly, is used for driving the air compression assembly and comprises a motor cylinder, a driving motor, a first cooling fin and a second cooling fin; the bottom of the motor cylinder is provided with a first heat dissipation channel, and the top is provided with a second heat dissipation channel. The first radiating fin is arranged at the bottom of the motor cylinder and is arranged in the first radiating channel; the second radiating fin is arranged at the top of the motor cylinder and is arranged in the second radiating channel; the air inlet assembly is arranged on the right side of the driving assembly and communicates with the first heat dissipation channel and the second heat dissipation channel. The variable-frequency speed regulation assembly is arranged at the top of the driving assembly and comprises a shell and a radiator; and the radiator is arranged at the bottom of the shell and is arranged in the second radiating channel. Through the arrangement, the heat dissipation effect of the screw compressor is better, and the integration level and the overall energy efficiency ratio are higher.

Description

Technical Field

[0001] This utility model relates to the field of screw compressor technology, and in particular to an integrated air-cooled screw compressor. Background Technology

[0002] Screw compressors are key pieces of equipment widely used in industrial fields, and their core drive components include permanent magnet synchronous motors and variable frequency drives.

[0003] Permanent magnet synchronous motors typically rely on a separate cooling system for heat exchange. This system uses a centrifugal fan impeller and a guide shroud to create air pressure, thereby cooling the motor. Variable frequency drives (VFDs) generate significant heat when operating at rated current, and their cooling is usually achieved through a separate axial fan. However, axial fans are inefficient and perform poorly, making it difficult to effectively reduce the operating temperature of the VFD. Furthermore, the separate cooling systems for the permanent magnet synchronous motor and the VFD result in a lack of synergy in their thermal management, leading to inadequate cooling and reduced equipment efficiency. Additionally, the higher temperatures of both the motor and the VFD further impact the stability and lifespan of the equipment. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide an integrated air-cooled screw compressor. This screw compressor optimizes the structural design of its cooling system, integrating the cooling systems of the drive assembly and the variable frequency speed control assembly, thereby improving the cooling effect and enhancing the equipment's operating efficiency and reliability.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An integrated air-cooled screw compressor includes: an air compression assembly, a drive assembly, an intake assembly, and a variable frequency drive assembly; the air compression assembly is used to compress input air; the drive assembly is installed on the right side of the air compression assembly and is used to drive the air compression assembly, including a motor cylinder, a drive motor, a first heat sink, and a second heat sink; the drive motor is disposed inside the motor cylinder and connected to the air compression assembly; the bottom of the motor cylinder has a first heat dissipation channel, and the top has a second heat dissipation channel; the first heat sink is installed at the bottom of the motor cylinder, close to the drive motor, and at least partially disposed within the first heat dissipation channel; the second heat sink is installed at the top of the motor cylinder, close to the drive motor, and at least partially disposed within the second heat dissipation channel; the intake assembly is installed on the right side of the drive assembly and communicates with the first and second heat dissipation channels; the variable frequency drive assembly is at least partially disposed on the top of the drive assembly and the intake assembly, and includes a housing and a radiator; the radiator is installed at the bottom of the housing and at least partially disposed within the second heat dissipation channel.

[0007] Furthermore, the housing includes an upper shell, a lower shell, a first sealing step surface, and a second sealing step surface; the front ends of the upper shell and the lower shell are connected through the first sealing step surface to form a sealing structure; the rear ends of the upper shell and the lower shell are connected through the second sealing step surface to form a sealing structure.

[0008] Furthermore, the gap D1 between the first sealing step surfaces of the upper and lower shells is less than or equal to 1 mm; the gap D2 between the second sealing step surfaces of the upper and lower shells is less than or equal to 1 mm.

[0009] Furthermore, the variable frequency speed control component includes an IGBT module, which is at least partially disposed at the bottom of the housing cavity, and the heat sink is disposed close to the IGBT module.

[0010] Furthermore, the variable frequency speed control component also includes a lead-out module; the lead-out module is located at the rear end of the lower housing; the lead-out module includes a lead-out wire connecting the internal and external circuits of the variable frequency speed control component and a sealing sleeve covering the lead-out wire; a sealing ring is provided at the connection between the sealing sleeve and the lower housing and is fitted on the sealing sleeve.

[0011] Furthermore, the variable frequency speed control component also includes a rectifier module and an inverter drive PCB board; the inverter drive PCB board is at least partially disposed inside the housing and is connected to the IGBT module through the rectifier module.

[0012] Furthermore, the drive motor includes a first operating speed and a second operating speed; when the variable frequency speed control component is operating under rated load, the drive motor is at the first operating speed; when the load of the air compression component changes, and the operating load of the rectifier module and IGBT module changes accordingly, the variable frequency speed control component controls the drive motor to operate at the second operating speed; the ratio of the difference between the second operating speed and the first operating speed to the change in the operating load of the rectifier module and IGBT module is the change coefficient k.

[0013] Furthermore, a liquid crystal display driver board is provided on the top of the upper shell, and a display screen film is covered on the liquid crystal display driver board.

[0014] Furthermore, the air intake assembly includes a cover, a rotating shaft, and a centrifugal impeller; the cover is installed on the right side of the motor cylinder, and an air inlet is provided at the right end; the centrifugal impeller is at least partially disposed inside the cover; the rotating shaft extends in the left-right direction, connects to the centrifugal impeller, passes through the motor cylinder, and connects to the drive motor; the drive motor can drive the centrifugal impeller to rotate through the rotating shaft; both the first heat dissipation channel and the second heat dissipation channel are connected to the interior of the cover.

[0015] Furthermore, an air guide shroud is provided above the air inlet, and an air guide plate is provided at the bottom of the variable frequency speed control component near the air guide shroud. An air guide channel is formed between the air guide plate and the air guide shroud. Air can flow into the shroud from the air inlet, be guided by the air guide shroud and the air guide plate, and flow into the second heat dissipation channel from the air guide channel.

[0016] The aforementioned integrated air-cooled screw compressor optimizes the cooling system's structural design by integrating the cooling systems of the drive assembly and the variable frequency drive assembly. Combined with the thermal management requirements of both components, this achieves more efficient cooling, improving equipment operating efficiency and reliability. Simultaneously, the integrated design reduces the use of independent cooling components, lowering system complexity and power consumption, further enhancing the overall energy efficiency ratio of the screw compressor. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of a screw compressor provided according to this utility model;

[0018] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0019] Figure 3 yes Figure 1 A magnified view of a section at point B. Detailed Implementation

[0020] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] In addition, to clearly illustrate the technical solution of this application, the following are also defined: Figure 1 The top, bottom, left, and right sides are shown.

[0022] like Figure 1 As shown, this application provides an integrated air-cooled screw compressor. The screw compressor includes an air compression assembly 11, a drive assembly 12, an intake assembly 15, and a variable frequency speed control assembly 16.

[0023] Specifically, the air compression assembly 11 includes a male rotor 111 and a female rotor that mesh with each other for compressing the input air. The rotation axes of both the male rotor 111 and the female rotor extend in the left-right direction.

[0024] A drive assembly 12 is mounted on the right side of the air compression assembly 11 and is used to drive the air compression assembly 11. It includes a motor cylinder 121, a drive motor 122, a first heat sink 123, and a second heat sink 124. The motor cylinder 121 protects the internal components of the drive assembly 12. The drive motor 122 is at least partially disposed within the motor cylinder 121 and connected to the air compression assembly 11; specifically, the drive motor 122 is connected to the male rotor 111 and can drive the male rotor 111 to rotate. The bottom of the motor cylinder 121 has a first heat dissipation channel 13, and the top has a second heat dissipation channel 14. Specifically, the first heat sink 123 is mounted at the bottom of the motor cylinder 121, close to the drive motor 122, and is at least partially disposed within the first heat dissipation channel 13. The second heat sink 124 is mounted at the top of the motor cylinder 121, close to the drive motor 122, and is at least partially disposed within the second heat dissipation channel 14. The first heat sink 123 / the second heat sink 124 is used to exchange heat with the cold air in the first heat dissipation channel 13 / the second heat dissipation channel 14 in order to dissipate heat from the stator heating element in the drive motor 122.

[0025] An air intake assembly 15 is installed on the right side of the drive assembly 12 and communicates with the first heat dissipation channel 13 and the second heat dissipation channel 14. It includes a cover 151, a rotating shaft 152, and a centrifugal impeller 153. The cover 151 is installed on the right side of the motor cylinder 121, with an air inlet 154 at its right end. The centrifugal impeller 153 is at least partially disposed within the cover 151. The rotating shaft 152 extends in a left-right direction, connects to the centrifugal impeller 153, passes through the motor cylinder 121, and connects to the drive motor 122. Both the first heat dissipation channel 13 and the second heat dissipation channel 14 communicate with the interior of the cover 151. The drive motor 122 can drive the centrifugal impeller 153 to rotate via the rotating shaft 152, creating airflow and air pressure within the cover 151. External cold air can then flow in from the air inlet 154, pass through the first heat dissipation channel 13 and the second heat dissipation channel 14, and exchange heat with the first heat sink 123 and the second heat sink 124, ensuring the stable operation of the drive assembly 12.

[0026] The variable frequency drive assembly 16 is at least partially mounted above the drive assembly 12 and the intake assembly 15, and includes a housing 161, a heat sink 162, and an IGBT module 163. The IGBT module 163 is at least partially disposed at the bottom of the inner cavity of the housing 161. The heat sink 162 is mounted at the bottom of the housing 161, close to the IGBT module 163, and is at least partially disposed within the second heat dissipation channel 14. When cold air flows through the second heat dissipation channel 14, it can simultaneously exchange heat with the heat sink 162 and the second heat sink 124, improving the heat dissipation efficiency of the variable frequency drive assembly 16; at the same time, it reduces the need for an independent axial fan in the variable frequency drive assembly 16, reducing the power consumption and cost of the screw compressor; furthermore, this heat dissipation structure is highly compact, improving the space utilization of the screw compressor.

[0027] Through the above configuration, the screw compressor integrates the drive assembly 12, the intake assembly 15, and the variable frequency speed control assembly 16 into a single design, and optimizes the heat dissipation channel and assembly layout. This achieves integrated high-efficiency heat dissipation and high-performance drive, solving the problems of complex structure and low heat dissipation efficiency in traditional screw compressors, and improving the integration and operational reliability of the equipment. Furthermore, while traditional screw compressors use a motor air guide shroud for airflow guidance, the intake assembly 15 and drive assembly 12 are independently configured, with the air guide shroud 155 of the intake assembly 15 used for airflow guidance. This avoids air leakage and uneven airflow during heat exchange.

[0028] like Figure 1 As shown, the housing 161 includes an upper housing 1611, a lower housing 1612, a first sealing step surface 1613, and a second sealing step surface 1614. Specifically, the front ends of the upper housing 1611 and the lower housing 1612 are connected through the first sealing step surface 1613 to form a sealed structure. The rear ends of the upper housing 1611 and the lower housing 1612 are connected through the second sealing step surface 1614 to form a sealed structure. This prevents oil, water, dust, metal shavings, etc., from entering the frequency converter and damaging electrical components.

[0029] like Figures 2 to 3 As shown, the gap D1 between the first sealing step surface 1613 between the upper shell 1611 and the lower shell 1612 is less than or equal to 1 mm. The gap D2 between the second sealing step surface 1614 between the upper shell 1611 and the lower shell 1612 is less than or equal to 1 mm. With the above settings, the frequency converter has a high protection level, effectively preventing solid objects with a diameter greater than 1 mm from entering, and preventing splashing water droplets and dust from entering, making it suitable for applications in harsh environments.

[0030] The top of the upper shell 1611 is provided with a liquid crystal display driver board 1615, and the liquid crystal display driver board 1615 is covered with a display screen film 1616 to achieve waterproof and dustproof protection.

[0031] Specifically, the lower housing 1612 is made of plastic, while the IGBT module 163 is made of metal. A hard-soft sealing structure is formed between the lower housing 1612 and the IGBT module 163 to prevent moisture and dust from entering the frequency converter assembly 16 from the drive assembly 12. At the same time, the hard-soft sealing structure reduces the need for additional sealing structures, thus reducing material costs. Furthermore, the hard-soft sealing structure can be replaced by deformation caused by mechanical vibration and thermal expansion, further improving the stability of the connection between the lower housing 1612 and the IGBT module 163.

[0032] Specifically, the rear end of the lower housing 1612 is provided with a lead-out module 164. The lead-out module 164 includes a lead wire 1641 connecting the internal and external circuits of the frequency converter speed control component 16 and a sealing sleeve 1642 covering the lead wire 1641 to improve the sealing effect of the lead-out module 164. A sealing ring 1643 is provided at the connection between the sealing sleeve 1642 and the lower housing 1612, which is fitted on the sealing sleeve 1642 to improve the sealing effect at the connection between the lead-out module 164 and the lower housing 1612.

[0033] Furthermore, the variable frequency drive assembly 16 also includes a rectifier module 165 and an inverter drive PCB board 166. The inverter drive PCB board 166 is at least partially disposed within the housing 161 and is connected to the IGBT module 163 via the rectifier module 165. During operation, current is inverted and rectified by the inverter drive PCB board 166 and the rectifier module 165 before reaching the IGBT module 163 to drive its operation. In this process, electrical energy is converted into heat energy, which is dissipated by the heat sink 162 within the second heat dissipation channel 14.

[0034] The variable frequency drive assembly 16 also includes a control module 167. The control module 167 is housed within the housing 161 and connected to the housing 161 via several support members. It is electrically connected to the inverter drive PCB board 166, the rectifier module 165, and the IGBT module 163. The connections between the control module 167, the inverter drive PCB board 166, the rectifier module 165, and the IGBT module 163 and the housing 161 are all waterproof and dustproof, providing better protection for the variable frequency drive.

[0035] With the above-mentioned configuration, the assembly precision of the variable frequency drive assembly 16 is higher, and the protection level reaches IP54, which can prevent solid particles as small as 1mm from entering the housing 161. At the same time, waterproof and dustproof seals are provided between each electrical component inside the housing 161 and each contact surface of the housing 161, further improving the protection effect of the variable frequency drive assembly 16.

[0036] Furthermore, the drive motor 122 includes a first operating speed and a second operating speed. When the variable frequency drive assembly 16 is operating under rated load, the drive motor 122 is at the first operating speed. When the load of the air compression assembly 11 changes, and the operating loads of the rectifier module 165 and IGBT module 163 change accordingly, the variable frequency drive assembly 16 controls the drive motor 122 to operate at the second operating speed. The ratio of the difference between the second operating speed and the first operating speed to the change in the operating load of the rectifier module 165 and IGBT module 163 is the change coefficient k. The change coefficient k is determined based on the heat exchange efficiency and heat dissipation area of ​​the radiator 162. When the drive motor 122 is at the second operating speed, the airflow and air pressure generated by the intake assembly 15 can control the temperature of the variable frequency drive assembly 16 to a controllable optimal state. Through the above settings, the variable frequency drive assembly 16 does not need to be equipped with an additional cooling fan. The intake assembly 15 can be controlled by the drive assembly 12 according to the heat generation status of the internal electrical components, improving the controllability and reliability of the temperature regulation of the variable frequency drive assembly 16.

[0037] like Figure 1 As shown, an air guide shroud 155 is provided above the air inlet 154, and an air guide plate 156 is provided at the bottom of the variable frequency speed control component 16 near the air guide shroud 155. An air guide channel 157 is formed between the air guide plate 156 and the air guide shroud 155. Cold air flows in from the air inlet 154, is guided by the air guide shroud 155, and forms air volume and air pressure in the cover 151. After secondary guidance by the air guide plate 156, it flows into the second heat dissipation channel 14 through the air guide channel 157. Through secondary guidance, the airflow direction and air pressure distribution can be optimized, reducing cold air leakage and improving the flow stability of cold air in the cover 151 and the second heat dissipation channel 14, thereby ensuring the heat dissipation efficiency of the drive component 12 and the variable frequency speed control component 16.

[0038] Specifically, the air inlet 154 is an air inlet louver window to prevent dust or impurities from entering the cover 151; at the same time, the direction of cold air introduction is optimized to ensure that cold air can flow into the cover 151 evenly and stably.

[0039] The above description of embodiments of the present invention, through which those skilled in the art are able to implement or use the present invention, will be readily apparent to those skilled in the art. Various modifications to these embodiments will be readily apparent to those skilled in the art. The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novelty disclosed herein.

Claims

1. An integrated air-cooled screw compressor, characterized in that, include: An air compression assembly (11) is used to compress the input air; A drive assembly (12) is installed on the right side of the air compression assembly (11) and is used to drive the air compression assembly (11). The drive assembly (122) includes a motor cylinder (121), a drive motor (122), a first heat sink (123), and a second heat sink (124). The drive motor (122) is at least partially disposed inside the motor cylinder (121) and connected to the air compression assembly (11). The motor cylinder (121) has a first heat dissipation channel (13) at its bottom and a second heat dissipation channel (14) at its top. The first heat sink (123) is installed at the bottom of the motor cylinder (121) near the drive motor (122) and is at least partially disposed inside the first heat dissipation channel (13). The second heat sink (124) is installed at the top of the motor cylinder (121) near the drive motor (122) and is at least partially disposed inside the second heat dissipation channel (14). An air intake assembly (15) is installed on the right side of the drive assembly (12) and is connected to the first heat dissipation channel (13) and the second heat dissipation channel (14); A variable frequency speed control assembly (16) is at least partially installed on the top of the drive assembly (12) and the air intake assembly (15), including a housing (161) and a radiator (162); the radiator (162) is installed at the bottom of the housing (161) and is at least partially disposed in the second heat dissipation channel (14).

2. The integrated air-cooled screw compressor as described in claim 1, characterized in that, The housing (161) includes an upper shell (1611), a lower shell (1612), a first sealing step surface (1613), and a second sealing step surface (1614); the front ends of the upper shell (1611) and the lower shell (1612) are connected through the first sealing step surface (1613) to form a sealing structure; the rear ends of the upper shell (1611) and the lower shell (1612) are connected through the second sealing step surface (1614) to form a sealing structure.

3. The integrated air-cooled screw compressor as described in claim 2, characterized in that, The gap D1 between the first sealing step surface (1613) between the upper shell (1611) and the lower shell (1612) is less than or equal to 1 mm; the gap D2 between the second sealing step surface (1614) between the upper shell (1611) and the lower shell (1612) is less than or equal to 1 mm.

4. The integrated air-cooled screw compressor as described in claim 2, characterized in that, The variable frequency speed control component (16) includes an IGBT module (163), which is at least partially disposed at the bottom of the inner cavity of the housing (161), and the heat sink (162) is disposed close to the IGBT module (163).

5. The integrated air-cooled screw compressor as described in claim 4, characterized in that, The variable frequency speed control assembly (16) further includes a lead-out module (164); the lead-out module (164) is disposed at the rear end of the lower shell (1612); the lead-out module (164) includes a lead-out wire (1641) connecting the internal and external circuits of the variable frequency speed control assembly (16) and a sealing sleeve (1642) covering the lead-out wire (1641); a sealing ring (1643) is provided at the connection between the sealing sleeve (1642) and the lower shell (1612) and is sleeved on the sealing sleeve (1642).

6. The integrated air-cooled screw compressor as described in claim 4, characterized in that, The variable frequency speed control component (16) further includes a rectifier module (165) and an inverter drive PCB board (166); the inverter drive PCB board (166) is at least partially disposed in the housing (161) and is connected to the IGBT module (163) through the rectifier module (165).

7. The integrated air-cooled screw compressor as described in claim 6, characterized in that, The drive motor (122) includes a first operating speed and a second operating speed; when the variable frequency speed control component (16) is operating under rated load, the drive motor (122) is at the first operating speed; when the load of the air compression component (11) changes, and the operating load of the rectifier module (165) and the IGBT module (163) changes accordingly, the variable frequency speed control component (16) controls the drive motor (122) to be at the second operating speed; the ratio of the difference between the second operating speed and the first operating speed to the change in the operating load of the rectifier module (165) and the IGBT module (163) is the change coefficient k.

8. The integrated air-cooled screw compressor as described in claim 2, characterized in that, The top of the upper shell (1611) is provided with a liquid crystal display driver board (1615), and the liquid crystal display driver board (1615) is covered with a display screen film (1616).

9. The integrated air-cooled screw compressor as described in claim 1, characterized in that, The air intake assembly (15) includes a cover (151), a rotating shaft (152), and a centrifugal impeller (153); the cover (151) is installed on the right side of the motor cylinder (121), and an air inlet (154) is provided at the right end; the centrifugal impeller (153) is at least partially disposed inside the cover (151); the rotating shaft (152) extends in the left-right direction, is connected to the centrifugal impeller (153), passes through the motor cylinder (121), and is connected to the drive motor (122); the drive motor (122) can drive the centrifugal impeller (153) to rotate through the rotating shaft (152); the first heat dissipation channel (13) and the second heat dissipation channel (14) are both connected to the interior of the cover (151).

10. The integrated air-cooled screw compressor as described in claim 9, characterized in that, An air guide shroud (155) is provided above the air inlet (154), and an air guide plate (156) is provided at the bottom of the variable frequency speed control component (16) near the air guide shroud (155). An air guide channel (157) is formed between the air guide plate (156) and the air guide shroud (155). Air can flow into the cover (151) from the air inlet (154), be guided by the air guide shroud (155) and the air guide plate (156), and flow into the second heat dissipation channel (14) from the air guide channel (157).

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