Screw compressor with efficient heat dissipation function

Abstract

The utility model discloses a screw compressor with an efficient heat dissipation function. 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 mounted on the right side of the air compression assembly and comprises a motor cylinder and a driving motor; the top of the motor cylinder is provided with a first heat dissipation channel, and the bottom is provided with a second heat dissipation channel. The air inlet assembly is mounted on the right side of the driving assembly; the variable frequency speed regulation assembly is arranged above the driving assembly and the air inlet assembly and comprises a shell, an IGBT module, a radiator, a rectification module and an inversion driving PCB. The IGBT module is at least partially arranged at the bottom of the inner cavity of the shell; the radiator is arranged at the bottom of the shell, is close to the IGBT module and is arranged in the second heat dissipation channel; and the inversion driving PCB is at least partially arranged in the shell and is connected to the IGBT module through the rectification module. Through the arrangement, the variable-frequency speed regulation assembly and the driving assembly adopt the same cooling system, and the temperature controllability is higher.

Description

Technical Field

[0001] This utility model relates to the field of screw compressor technology, and in particular to a screw compressor with high-efficiency heat dissipation. Background Technology

[0002] Screw air compressors, as a type of high-efficiency gas compression equipment, are widely used in industrial production, especially in manufacturing, chemical, pharmaceutical and power industries.

[0003] In screw compressors, the permanent magnet synchronous motor is typically driven by a variable frequency drive (VFD). However, the VFD generates a significant amount of heat when operating at its rated current, accounting for approximately 3% of the motor's rated power consumption. While a fan draws heat from the module and expels it, the heat distribution is scattered and uneven, resulting in poor cooling efficiency and placing high demands on the fan's operating temperature. During normal rated load operation, the VFD incurs its own losses (approximately 3% of its rated power). The heat generated by these losses is exchanged between a heat exchanger and an independent fan. This independent fan requires separate control and protection; fan failure can easily trigger a module high-temperature alarm, and in severe cases, module explosion. This increases the VFD's failure rate. Furthermore, the VFD is prone to dust accumulation over time, requiring frequent maintenance and demanding high operator skills. It also lacks support for variable speed control of the cooling fan, and the VFD's temperature is subject to uncontrollable factors. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a screw compressor with high-efficiency heat dissipation. In this screw compressor, the variable frequency speed control component and the drive motor utilize the same heat dissipation system, resulting in high efficiency and strong controllability.

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

[0006] A high-efficiency heat-dissipating screw compressor includes: an air compression assembly, a drive assembly, an intake assembly, and a variable frequency speed control 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 and a drive motor disposed inside the motor cylinder; the top of the motor cylinder has a first heat dissipation channel and the bottom has a 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 speed control assembly is at least partially installed above the drive assembly and the intake assembly, and includes a housing, an IGBT module, a heat sink, and a rectifier module. The system includes a rectifier module and an inverter drive PCB board; the IGBT module is at least partially disposed at the bottom of the housing cavity; the heat sink is installed at the bottom of the housing, close to the IGBT module, and at least partially disposed within the second heat dissipation channel; the inverter drive PCB board is at least partially disposed within the housing and connected to the IGBT module via a rectifier module; 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 the IGBT module changes accordingly, the variable frequency speed control component controls the drive motor to operate at the second operating speed.

[0007] Furthermore, the drive assembly includes a motor cylinder, a drive motor, a first heat sink, and a second heat sink; the drive motor is at least partially disposed inside the motor cylinder and connected to the air compression assembly; the first heat sink is disposed at the bottom of the motor cylinder, close to the drive motor, and at least partially disposed within a first heat dissipation channel; the second heat sink is disposed at the top of the motor cylinder, close to the drive motor, and at least partially disposed within a second heat dissipation channel.

[0008] 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.

[0009] 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.

[0010] Furthermore, the air inlet is an air intake louver window.

[0011] 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.

[0012] 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.

[0013] Furthermore, the lower casing is made of plastic, while the IGBT module is made of metal. A hard-soft sealing structure is formed between the lower casing and the IGBT module to prevent moisture and dust from entering the frequency converter from the drive component.

[0014] 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.

[0015] Furthermore, the rear end of the lower shell is provided with a lead-out module; the lead-out module includes lead-out wires connecting the internal and external circuits of the frequency conversion speed control component and a sealing sleeve covering the lead-out wires; a sealing ring is provided at the connection between the sealing sleeve and the lower shell and is fitted on the sealing sleeve.

[0016] The aforementioned high-efficiency heat-dissipating screw compressor, drive assembly, and variable frequency drive assembly all use the same heat dissipation system, eliminating the need for a separate fan within the variable frequency drive assembly. This improves heat dissipation efficiency and reduces energy consumption. Furthermore, when the operating load of the air compression assembly changes, causing a change in the operating load of the variable frequency drive assembly, the variable frequency drive can control the drive motor to switch from a first operating speed to a second operating speed. This ensures that the temperature of the variable frequency drive assembly remains under control, thereby improving its applicability and controllability. 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 a screw compressor with high-efficiency heat dissipation. The screw compressor includes an air compression assembly, a drive assembly, an intake assembly, and a variable frequency speed control assembly.

[0023] Specifically, the air compression assembly contains meshing male and female rotors for compressing air. The rotation axes of both the male and female rotors extend in the left-right direction.

[0024] The drive assembly includes a motor cylinder, a drive motor, a first heat sink, and a second heat sink. The motor cylinder protects the internal components of the drive assembly. The drive motor is at least partially housed within the motor cylinder and connected to the male rotor, driving its rotation. The motor cylinder has a first heat dissipation channel at its bottom and a second heat dissipation channel at its top. Specifically, the first heat sink is attached to the bottom of the motor cylinder, close to the drive motor, and at least partially located within the first heat dissipation channel. The second heat sink is attached to the top of the motor cylinder, close to the drive motor, and at least partially located within the second heat dissipation channel. The first and second heat sinks exchange heat with the cool air within the first and second heat dissipation channels to dissipate heat from the stator heating components within the drive motor.

[0025] The air intake assembly includes a cover, a rotating shaft, and a centrifugal impeller. The cover is mounted on the right side of the motor cylinder, with an air inlet at the right end. The centrifugal impeller is at least partially housed within the cover. The rotating shaft extends laterally, connects to the centrifugal impeller, passes through the motor cylinder, and connects to the drive motor. Both the first and second heat dissipation channels communicate with the interior of the cover. The drive motor drives the centrifugal impeller to rotate via the rotating shaft, creating airflow and air pressure within the cover. This allows external cool air to flow in from the air inlet, pass through the first and second heat dissipation channels, and exchange heat with the first and second heat sinks, ensuring the stable operation of the drive assembly.

[0026] The variable frequency drive (VFD) assembly is at least partially mounted above the drive assembly and intake assembly, and includes a housing, an IGBT module, and a heat sink. The IGBT module is at least partially located at the bottom of the housing cavity. The heat sink is attached to the bottom of the housing, close to the IGBT module, and is at least partially located within a second heat dissipation channel. When cold air flows through the second heat dissipation channel, it can simultaneously exchange heat with the heat sink and the second heat sink fins, improving the heat dissipation efficiency of the VFD assembly. Simultaneously, it reduces the need for an independent axial fan in the VFD assembly, lowering 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 design, the screw compressor integrates the drive assembly, intake assembly, and variable frequency speed control assembly into a single unit, and optimizes the heat dissipation channel and component 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 and drive assembly in this application are independently configured, with the intake assembly's air guide shroud used for airflow guidance. This avoids air leakage and uneven airflow during heat exchange.

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

[0029] like Figures 1 to 3 As shown, 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. With the above settings, the frequency converter has a high protection level, effectively preventing the ingress of solid objects with a diameter greater than 1 mm, and preventing the ingress of splashing water droplets and dust, making it suitable for applications in harsh environments.

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

[0031] Specifically, the variable frequency drive assembly also includes a rectifier module and an inverter drive PCB board. The inverter drive PCB board is at least partially housed within the housing and is connected to the IGBT module via the rectifier module. During operation, current is rectified and inverted by the inverter drive PCB board and the rectifier module before reaching the IGBT module to drive its operation. In this process, electrical energy is converted into heat energy, which is dissipated by a heat sink within the second heat dissipation channel.

[0032] The lower housing has a lead-out module at its rear end. The lead-out module includes lead wires connecting the internal and external circuits of the frequency converter and a sealing sleeve covering the lead wires to improve the sealing effect of the lead-out module. A sealing ring is provided at the connection between the sealing sleeve and the lower housing, which is fitted onto the sealing sleeve to improve the sealing effect at the connection between the lead-out module and the lower housing.

[0033] With the above-mentioned configuration, the assembly precision of the variable frequency drive assembly is higher, and the protection level reaches IP, preventing solid particles as small as 1mm from entering the housing. Simultaneously, waterproof and dustproof seals are applied between each electrical component inside the housing and each contact surface of the housing, further enhancing the protection effect of the variable frequency drive assembly.

[0034] The variable frequency drive assembly also includes a control module. The control module is housed within the casing and connected to it via several support components. It is electrically connected to the inverter drive PCB board, rectifier module, and IGBT module. All connections between the control module, inverter drive PCB board, rectifier module, and IGBT module and the casing are waterproofed and dustproofed, providing better protection for the variable frequency drive.

[0035] More specifically, the lower housing is made of plastic, while the IGBT module is made of metal. A hard-soft seal structure is formed between the lower housing and the IGBT module to prevent moisture and dust from entering the frequency converter from the drive component. At the same time, the hard-soft seal structure reduces the need for additional sealing structures, thus reducing material costs. Furthermore, the hard-soft seal structure can be replaced by deformation caused by mechanical vibration and thermal expansion, further improving the stability of the connection between the lower housing and the IGBT module.

[0036] Furthermore, the drive motor includes a first operating speed and a second operating speed. When the variable frequency drive (VFD) is operating under rated load, the drive motor operates at the first operating speed. When the load of the air compressor component changes, and the operating loads of the rectifier module and IGBT module change accordingly, the VFD 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 variation coefficient k. The variation coefficient k is determined based on the heat exchange efficiency and heat dissipation area of ​​the radiator. When the drive motor is operating at the second operating speed, the airflow and air pressure generated by the intake component can control the temperature of the VFD to a controllable optimal state.

[0037] like Figure 1As shown, an air guide shroud is installed above the air inlet, and an air guide plate is installed 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. Cold air flows in from the air inlet, is guided by the air guide shroud, and forms air volume and pressure inside the shroud. It is then guided a second time by the air guide plate and flows into the second heat dissipation channel through the air guide channel. Through secondary air 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 shroud and the second heat dissipation channel, thereby ensuring the heat dissipation efficiency of the drive component and the variable frequency speed control component.

[0038] Specifically, the air inlet is a louvered window to prevent dust or impurities from entering the enclosure; at the same time, the direction of cold air introduction is optimized to ensure that cold air can flow into the enclosure 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. A high-efficiency heat dissipation 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 (121) includes a motor cylinder (121) and a drive motor (122) disposed in the motor cylinder (121). The top of the motor cylinder (121) is provided with a first heat dissipation channel (13) and the bottom is provided with a second heat dissipation channel (14). 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); A variable frequency speed control assembly (16) is at least partially mounted above the drive assembly (12) and the air intake assembly (15), and includes a housing (161), an IGBT module (162), a heat sink (163), a rectifier module (164), and an inverter drive PCB board (165); the IGBT module (162) is at least partially disposed at the bottom of the inner cavity of the housing (161); the heat sink (163) is mounted at the bottom of the housing (161), close to the IGBT module (162), and at least partially disposed within the second heat dissipation channel (14); the inverter drive PCB board (165) is at least partially disposed within the housing (161) and connected to the IGBT module (162) through the rectifier module (164); The drive motor (122) includes a first operating speed and a second operating speed; when the variable frequency speed control component (16) is running 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 (164) and the IGBT module (162) changes accordingly, the variable frequency speed control component (16) controls the drive motor (122) to be at the second operating speed.

2. The high-efficiency heat dissipation screw compressor as described in claim 1, characterized in that, The drive assembly (12) further includes a first heat sink (123) and a second heat sink (124); the first heat sink (123) is installed at the bottom of the motor cylinder (121), close to the drive motor (122), and is at least partially installed in the first heat dissipation channel (13); the second heat sink (124) is installed at the top of the motor cylinder (121), close to the drive motor (122), and is at least partially installed in the second heat dissipation channel (14).

3. The high-efficiency heat dissipation screw compressor as described in claim 2, 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).

4. The high-efficiency heat dissipation screw compressor as described in claim 3, 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).

5. The high-efficiency heat dissipation screw compressor as described in claim 3, characterized in that, The air inlet (154) is an air inlet louver window.

6. The high-efficiency heat dissipation 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.

7. The high-efficiency heat dissipation screw compressor as described in claim 6, 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.

8. The high-efficiency heat dissipation screw compressor as described in claim 6, characterized in that, The lower shell (1612) is made of plastic, and the IGBT module (162) is made of metal. A hard-soft sealing structure is formed between the lower shell (1612) and the IGBT module (163) to prevent moisture and dust from entering the variable frequency speed control component (16) from the drive component (12).

9. The high-efficiency heat dissipation screw compressor as described in claim 6, 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).

10. The high-efficiency heat dissipation screw compressor as described in claim 6, characterized in that, The lower housing (1612) has a lead-out module (166) at its rear end; the lead-out module (166) includes a lead-out wire (1661) that connects the internal and external circuits of the variable frequency speed control component (16) and a sealing sleeve (1662) that covers the lead-out wire (1661); a sealing ring (1663) is provided at the connection between the sealing sleeve (1662) and the lower housing (1612).

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