Cost-reducing efficiency-increasing control system and method for magnetic suspension centrifugal blower unit

Abstract

The invention relates to the technical field of centrifugal blowers, in particular to a cost-reducing and efficiency-increasing control system and method for a magnetic suspension centrifugal blower unit, and the system comprises a cabinet body, a built-in mounting plate, a motor base and an electrical component, and the cabinet body is sequentially divided into a fan bin, a strong current bin, a weak current bin and a circuit breaker bin; the built-in mounting plate comprises a reactor mounting plate, a frequency converter mounting plate, an electrical element mounting plate, a magnetic controller mounting plate and a circuit breaker mounting plate. The cabinet body is divided into four bins, typesetting and deployment are carried out again, the length, width and height of the whole unit are reduced, all the bins are separated through the partition plates, current interaction is avoided, the built-in mounting plates are fixed to the partition plates, and the use space of the bin body is further reduced; the motor base is made of sheet metal parts, so that the whole motor base is lighter and more attractive; connection is established among the chambers for selecting more appropriate electrical components, so that the purposes of reducing cost and increasing efficiency are further achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of centrifugal blowers, and in particular to a cost-reduction and efficiency-enhancing control system and method for a magnetically suspended centrifugal blower unit. Background Art

[0002] Magnetic levitation centrifugal blowers have the characteristics of high efficiency, energy saving, low carbon and environmental protection, intelligent design, etc. The performance of the whole machine is significantly better than that of traditional blowers. Therefore, they account for a large proportion in the current suspension blower market application. Moreover, with the global attention to energy saving and consumption reduction, the sales volume of magnetic levitation blowers has increased year by year. Under the premise that its usage is on the rise, various manufacturers are also facing huge competition and challenges. Relevant companies and manufacturers have also been optimizing their products in various ways to achieve the purpose of reducing costs and increasing efficiency. This not only helps to enhance the stability of internal operations of the enterprise, but also to cope with possible market fluctuations and risks.

[0003] At present, the cost of magnetic levitation blowers is mainly concentrated in the production of cabinets, the selection of frequency converters, the selection of reactors, and the selection of various electrical components. The cabinet of the magnetic levitation blower plays an important role in the whole machine. On the one hand, it exists as a carrier of all components, and on the other hand, it also bears the direction of the air duct in the warehouse. At present, the cabinet volume of the magnetic levitation blower is mainly determined by two factors. The first is the active factor. The unreasonable compartment design and component layout of the silo itself will lead to extremely uneven use of the cabinet space, which in turn affects the volume of the whole cabinet; the second is the passive factor, which is restricted by the power used. The greater the power, the more electrical components are required, and the volume will also increase accordingly. The overall air inlet area required by the fan is also wider. Fans exceeding 300kW also need to be equipped with a water cooling system. These are important factors affecting the size of the fan, and they are related to the performance and cost of the magnetic levitation blower.

[0004] The fan cabinet also affects the selection of the inverter. An unreasonable layout will cause the inverter temperature to rise too high and fail to achieve a good heat dissipation effect. Therefore, a larger inverter model has to be selected, which not only increases the cost, but also fails to meet the overall use effect. In addition, the inductance value of the reactor also affects the temperature rise of the motor. Its inductance value is proportional to its own cost. Therefore, the cost of the magnetic levitation fan can be reduced and the efficiency can be increased by reducing the inductance value of the reactor. However, based on the above technical problems, there is a lack of a complete design layout to achieve the optimization of the fan's working performance. A design method for reducing the cost and increasing the efficiency of a magnetic levitation centrifugal blower unit is urgently needed. Summary of the invention

[0005] In order to solve the above-mentioned problems, the present invention provides a cost-reducing and efficiency-increasing control system and method for a magnetic levitation centrifugal blower unit.

[0006] In the first aspect, the present invention provides a cost reduction and efficiency improvement control system for a magnetic suspension centrifugal blower unit, which adopts the following technical solution: A cost-reduction and efficiency-increasing control system for a magnetic levitation centrifugal blower unit comprises: a cabinet, wherein the cabinet comprises a fan compartment, a high-voltage compartment, a low-voltage compartment and a circuit breaker compartment, wherein the fan compartment, the high-voltage compartment, the low-voltage compartment and the circuit breaker compartment are connected via cables; wherein a reactor and a reactor mounting plate are arranged in the fan compartment; a frequency converter heat dissipation cover and an exhaust duct are arranged in the high-voltage compartment to reduce the temperature rise during the operation of the frequency converter; a frequency converter mounting plate and a frequency converter are installed in the high-voltage compartment; a UPS power supply, a transformer, a magnetic bearing controller and a controller mounting plate are installed in the low-voltage compartment; and a circuit breaker and a circuit breaker mounting plate are installed in the circuit breaker compartment.

[0007] Furthermore, an air intake filter window is provided on one side of the fan compartment. The air intake filter window adopts a shutter structure. The air intake filter window is equipped with primary and medium efficiency filtering devices to provide the necessary air volume for the operation of the fan, while blocking the entry of dust and impurities, thereby ensuring the cleanliness of the air.

[0008] Furthermore, each compartment of the cabinet is separated by partition sheet metal and square tubes to ensure their independence and sealing. A hole is opened below the partition between each compartment for the cable to pass through the threading plate.

[0009] Furthermore, square openings are designed above the partitions of the strong and weak current compartments, so that the external wind can pass through the air intake filter louvers to ventilate and cool the strong and weak current compartments by taking advantage of the pressure difference between the fan compartment and the outside world.

[0010] Furthermore, the weak current warehouse includes a magnetic bearing controller, and the magnetic bearing controller includes a magnetic bearing controller mounting plate. The magnetic bearing controller mounting plate is modified according to the volume of the magnetic bearing controller to reduce the height and width so as to reduce the overall volume.

[0011] Furthermore, the reactor is installed in the fan compartment, and the reactor reduces its own inductance by changing the coil length, cross-sectional area and number of coil turns, so as to reduce the temperature rise of the motor.

[0012] Furthermore, the fan compartment is equipped with sound insulation cotton to reduce the noise generated when the fan is running; and a motor heat dissipation cover is designed on the top of the fan compartment to ensure that the motor can effectively dissipate heat.

[0013] Furthermore, a motor is provided in the fan compartment, and the installation position of the motor is determined by the distance between the air inlet of the motor main unit in the fan compartment and the cabinet door, so as to reduce the volume of the whole machine.

[0014] Furthermore, a shock-absorbing pad and a motor base are provided in the fan compartment to provide support and stability for the operation of the motor; the motor base is formed by integrated bending, and the motor base is provided with a support plate to raise the height of the motor.

[0015] In a second aspect, a cost reduction and efficiency improvement control method for a magnetic suspension centrifugal blower unit includes: The motor bearing of the fan compartment is floated, and the drain valve is opened at the same time, until the bearing is floated smoothly, and the fan host is started; When the fan reaches the predetermined valve closing speed, the drain valve is closed and the main engine continues to increase speed. When the fan reaches the set speed, the fan can operate normally. During the operation of the fan, the temperature, pressure, flow and pressure difference signals of the entire fan are collected in real time.

[0016] In summary, the present invention has the following beneficial technical effects: 1. Through comprehensive consideration of various design methods, the overall volume of the cabinet is reduced. In terms of layout, the strong current compartment, weak current compartment, fan compartment and circuit breaker compartment are rearranged, so that the effective use space of the entire cabinet is greatly increased, achieving the effect of reducing the size of the cabinet; 2. In terms of the cabinet, the length, width and height of each mounting plate used inside the whole machine are adjusted without affecting the function, and the installation position is re-planned. For the universal mounting plate, the shape, size and installation position are directly specified, which can reduce the size of the cabinet and save installation time; 3. In terms of cost, the material usage of the entire cabinet is reduced, the electrical components are more integrated, and the transportation is more convenient. The inverter can choose a lower-grade model, and the reactor can choose a type with a lower inductance value, all of which greatly saves costs; 4. In terms of performance, the reduction of the cabinet size and the selection of the inverter and reactor not only did not reduce the original use effect of the fan, but also reduced the temperature of the internal fan compartment by 4°C under operating conditions compared with the original fan. The internal space of the weak current compartment of the new different models of the whole machine is designed with a unified layout, and the cabinets are serialized to ensure the overall consistency of the style, which is not only more beautiful, but also achieves the purpose of reducing costs and increasing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0018] Figure 2 2 is another structural diagram of an embodiment of the present invention.

[0019] Among them, 1. Fan compartment; 2. High-voltage compartment; 3. Low-voltage compartment; 4. Circuit breaker compartment; 34. Reactor mounting plate; 35 Inverter mounting plate; 36. Electrical component mounting plate; 37. Magnetic bearing controller mounting plate; 38. Circuit breaker mounting plate; 40. Sound insulation cotton; 52. Ventilation opening; 61. Motor base; 62. Shock-absorbing pad; 76. Double-layer air intake filter window; 77. Double-layer air intake filter window; 78. Single-layer air intake filter window; 82. Inverter heat sink; 83. Exhaust duct; 84. Motor heat sink; 121. Inverter; 122. Reactor; 123. Magnetic bearing controller; 124. UPS power supply; 125. Transformer; 126. Circuit breaker. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0021] Example 1 Reference Figure 1 The specific design of a cost reduction and efficiency improvement control system for a magnetic suspension centrifugal blower unit of this embodiment is as follows: It includes a cabinet body, a built-in mounting plate, a motor base 61, and electrical components. The cabinet body is designed as a fan compartment 1, a strong current compartment 2, a weak current compartment 3, and a circuit breaker compartment 4 in sequence; the built-in mounting plate includes a reactor mounting plate 34, a frequency converter mounting plate 35, an electrical component mounting plate 36, a magnetic bearing controller mounting plate 37, and a circuit breaker mounting plate 38; the electrical components are composed of a frequency converter 121, a reactor 122, a magnetic bearing controller 123, a UPS power supply 124, a transformer 125, and a circuit breaker 126, and each is arranged in a suitable compartment.

[0022] The reactor mounting plate 34, the motor base 61, the shock-absorbing pad 62, and the reactor 122 are installed inside the fan compartment 1; the inverter mounting plate 35 and the inverter 121 are installed inside the strong power compartment 2; the electrical component mounting plate 36, the magnetic bearing controller mounting plate 37, the magnetic bearing controller 123, the UPS power supply 124, and the transformer 125 are installed inside the weak power compartment 3; the circuit breaker mounting plate 38 and the circuit breaker 126 are installed inside the circuit breaker compartment 4. The reactor 122 is installed on the reactor mounting plate 34; the inverter 122 is installed on the inverter mounting plate 35; the magnetic bearing controller 123 is installed on the magnetic bearing controller mounting plate 37; the circuit breaker 126 is installed on the circuit breaker mounting plate 38; and the motor base 61 is fixed on the shock-absorbing pad 62. The motor heat dissipation cover 84 is installed on the top of the fan compartment 1; the inverter heat dissipation cover 82 is installed on the top of the strong power compartment 2; and the exhaust duct 83 is installed on the upper part of the inverter 121. The double-layer air intake filter shutter 76 is on one side of the fan compartment 1; the single-layer air intake filter shutter 78 is designed on the switch cabinet door of the strong power compartment 2; the double-layer air intake filter shutter 77 is designed on the switch cabinet door of the weak power compartment 3. The sound insulation cotton 40 is wrapped around the fan compartment 1; the ventilation port 52 is designed on the partition between the fan compartment 1 and the strong power compartment 2.

[0023] 1. This embodiment divides the cabinet into four compartments, namely, the fan compartment, the strong current compartment, the weak current compartment, and the circuit breaker compartment. The strong and weak current compartments are designed to be unevenly distributed. Compared with the original symmetrical layout, the space loss is avoided. By reducing the horizontal distance of the weak current compartment and expanding the vertical length, not only can all the components used be carried, but the protruding space also makes up for the area waste of the original fan compartment, making the entire layout fuller; 2. Redesign the air intake filter of the fan compartment. The original air intake door was evenly divided into four windows. Although it ensured sufficient air intake, the design was too bulky, which caused workers to spend a lot of energy during the installation process. The newly designed air intake door abandoned the original structure, reduced the length and width, and combined the four windows into one, which not only reduced the weight of the cabinet door, but also kept the overall air intake area unchanged. The window door style is designed as a shutter style, which enhances the fan's ability to filter dust and impurities; 3. By calculating the distance between the air inlet of the motor host and the cabinet door in the fan compartment, and using the formula of 1.5×φP (φP represents the inner diameter of the impeller cover nozzle), the installation position of the motor can be determined more reasonably, unnecessary space can be reduced, and the volume of the whole machine can be reduced; 4. By designing a new motor base, compared with the original base, the new motor base is completed by integrated bending, with a support plate at the bottom, which not only reduces the weight, but also reduces the height of the cabinet, while ensuring the stability of the fan during operation; 5. Under the condition that components can be loaded, the length and width of the inverter mounting plate and the controller mounting plate are redesigned, their positions in the strong and weak power compartments are adjusted, the side wall space of the cabinet is effectively utilized, and the height of the cabinet is reduced; Example 2 Reference Figure 2 The specific design of a cost reduction and efficiency improvement control system for a magnetic suspension centrifugal blower unit of this embodiment is as follows: 1. This embodiment changes the structure of the inverter compartment, connects the fan compartment with the inverter compartment, and uses the suction effect of the main impeller to cool down. Since the main impeller has a large suction volume, a large amount of wind passes through the filter window and flows through the heat dissipation channel of the inverter to dissipate heat for the inverter. The cooling effect is verified by experiments, and the temperature is reduced by 10°C compared with the previous independent heat dissipation. Compared with the original fan, the inverter can be used at a lower level, and the cost is reduced by 10%; 2. The reactor has a filtering function, which is used to reduce the temperature rise during the operation of the motor. Its cost is positively correlated with its own inductance value. Therefore, by reducing the inductance value of the reactor and increasing the carrier of the inverter from 7K to 9K, the temperature rise of the motor can remain unchanged. Therefore, by reducing the inductance value of the reactor, the effect of reducing costs and increasing efficiency can also be achieved.

[0024] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A cost reduction and efficiency improvement control system for a magnetic suspension centrifugal blower unit, comprising: The cabinet comprises a fan compartment, a high-voltage compartment, a low-voltage compartment and a circuit breaker compartment, wherein the fan compartment, the high-voltage compartment, the low-voltage compartment and the circuit breaker compartment are connected by cables; wherein a reactor and a reactor mounting plate are arranged in the fan compartment; a frequency converter heat dissipation cover and an exhaust duct are arranged in the high-voltage compartment to reduce the temperature rise during the operation of the frequency converter; a frequency converter mounting plate and a frequency converter are installed in the high-voltage compartment; a UPS power supply, a transformer, a magnetic bearing controller and a controller mounting plate are installed in the low-voltage compartment; and a circuit breaker and a circuit breaker mounting plate are installed in the circuit breaker compartment.

2. A cost reduction and efficiency improvement control system for a magnetic suspension centrifugal blower unit according to claim 1, characterized in that: An air intake filter window is provided on one side of the fan compartment. The air intake filter window adopts a shutter structure. The air intake filter window is equipped with primary and medium efficiency filtering devices to provide the necessary air volume for the operation of the fan, while blocking the entry of dust and impurities, thereby ensuring the cleanliness of the air.

3. A cost reduction and efficiency improvement control system for a magnetic suspension centrifugal blower unit according to claim 2, characterized in that: Each compartment of the cabinet is separated by partition sheet metal and square tubes to ensure their independence and sealing. A hole is opened below the partition between each compartment for cables to pass through the threading plate.

4. A cost reduction and efficiency improvement control system for a magnetic suspension centrifugal blower unit according to claim 3, characterized in that: Square openings are designed above the partitions of the strong and weak current compartments, so that the external wind can pass through the air intake filter louvers to ventilate and cool the strong and weak current compartments by taking advantage of the pressure difference between the fan compartment and the outside world.

5. A cost reduction and efficiency improvement control system for a magnetic suspension centrifugal blower unit according to claim 4, characterized in that: The weak current warehouse includes a magnetic bearing controller, and the magnetic bearing controller includes a magnetic bearing controller mounting plate. The magnetic bearing controller mounting plate is modified according to the volume of the magnetic bearing controller to reduce the height and width so as to reduce the overall volume.

6. A cost reduction and efficiency improvement control system for a magnetic suspension centrifugal blower unit according to claim 5, characterized in that: The reactor is installed in the fan compartment. The reactor reduces its own inductance by changing the coil length, cross-sectional area and number of coil turns, so as to reduce the temperature rise of the motor.

7. A cost reduction and efficiency improvement control system for a magnetic suspension centrifugal blower unit according to claim 6, characterized in that: The fan compartment is filled with sound insulation cotton to reduce the noise generated when the fan is running; a motor heat dissipation cover is designed on the top of the fan compartment to ensure that the motor can effectively dissipate heat.

8. The cost reduction and efficiency improvement control system of a magnetic suspension centrifugal blower unit according to claim 7, characterized in that: A motor is arranged in the fan compartment, and the installation position of the motor is determined by the distance between the air inlet of the motor main unit in the fan compartment and the cabinet door, so as to reduce the volume of the whole machine.

9. A cost reduction and efficiency improvement control system for a magnetic suspension centrifugal blower unit according to claim 8, characterized in that: The fan compartment is also provided with a shock-absorbing pad and a motor base to provide support and stability for the operation of the motor; the motor base is formed by integrated bending, and the motor base is provided with a support plate to raise the height of the motor.

10. A cost reduction and efficiency improvement control method for a magnetic suspension centrifugal blower unit, characterized in that: include: The motor bearing of the fan compartment is floated, and the drain valve is opened at the same time, until the bearing is floated smoothly, and the fan host is started; When the fan reaches the predetermined valve closing speed, the drain valve is closed and the main engine continues to increase speed. When the fan reaches the set speed, the fan can operate normally. During the operation of the fan, the temperature, pressure, flow and pressure difference signals of the entire fan are collected in real time.

Images