CN114941959B - Waste heat island system based on wheel hub production line - Google Patents

Abstract

The invention provides a waste heat heat island system based on a wheel hub production line. The high temperature waste heat recovery equipment in the system is used to recover the high temperature waste heat, and the recovered high temperature waste heat energy is respectively transferred to the coating preheating plate changer and the machine cleaning plate changer. and auxiliary heat facilities; medium-temperature waste heat recovery equipment is used to recover medium-temperature waste heat, and the recovered medium-temperature waste heat energy is transferred to the machine-added cleaning plate exchange and auxiliary heat facilities respectively; the first-level low-grade waste heat utilization unit is used to improve low-temperature waste heat recovery The low-temperature waste heat energy recovered by the equipment is transferred to the machine-added cleaning plate exchange and auxiliary heat facilities respectively; the coating preheating plate exchange, machine-added cleaning plate exchange and auxiliary heat facilities are respectively used for the preheating of the coating process , Machine-added cleaning and auxiliary heating facilities for heating. The invention can recover the high, medium and low temperature waste heat of the wheel hub production line, and use it for downstream processes and auxiliary heat, so as to achieve the purpose of energy recovery and reuse.

Description

A waste heat heat island system based on wheel hub production line

technical field

The invention relates to the technical field of waste heat recovery of wheel hub production lines, in particular to a waste heat heat island system based on wheel hub production lines.

Background technique

Taking the sustainable development road of saving energy and developing circular economy has become an inevitable choice for enterprise development.

A large amount of waste heat energy will be generated in the production process of automobile wheels. In order to achieve the purpose of energy saving and emission reduction, it is necessary to combine the production process and recover the waste heat generated in the production process through a series of industrial equipment and intelligent technical means to form the waste heat of the wheel production line. "Heat Island", using heat island waste heat energy for downstream processes.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a waste heat heat island system based on the wheel hub production line in view of the deficiencies of the prior art, which can effectively collect the high, medium and low temperature waste heat of the wheel hub production line, and use it for other heat-requiring processes in the wheel hub production, To achieve the purpose of energy reuse, cost reduction and efficiency increase.

In order to solve the above-mentioned technical problems, the content of the present invention includes:

A waste heat heat island system based on a wheel hub production line, including high temperature waste heat recovery equipment, medium temperature waste heat recovery equipment, low temperature waste heat recovery equipment, coating preheating plate change, machine-added cleaning plate change, auxiliary heat facilities, first-class low-grade waste heat Utilize the unit and the cold process plate replacement; the high temperature waste heat recovery equipment is used to recover the high temperature waste heat of the flue gas of the smelting furnace in the wheel hub production line, and transfer the recovered high temperature waste heat energy to the coating preheating plate replacement and machine cleaning respectively. Plate exchange and auxiliary heat facilities; the medium-temperature waste heat recovery equipment is used to recover the medium-temperature waste heat generated by the quenching tank in the wheel hub production line, and transfer the recovered medium-temperature waste heat energy to the machine-added cleaning plate exchange and auxiliary heat facilities respectively; The low-temperature waste heat recovery equipment is used to recover the low-temperature waste heat of the air compressor, hydraulic station, die-casting machine and mold in the wheel hub production line. It is transferred to the machine-added cleaning plate changer and auxiliary heat facilities respectively; the cold water generated by the first-level low-grade waste heat utilization unit during the lifting process is transferred to the plate changer that needs to be cooled; The cleaning plate exchange and auxiliary heating facilities are respectively used for heating of the coating process preheating, machine cleaning and auxiliary heating facilities, and the cold process plate exchange is used for cooling in the wheel hub production line.

Further, it also includes a general circulation pipeline; the general circulation pipeline is used to replenish water for the high-temperature waste heat recovery equipment, the medium-temperature waste heat recovery equipment and the low-temperature waste heat recovery equipment, and for the replacement of the coating preheating plate and the machine-added cleaning plate. , Auxiliary heat facilities and drainage of first-class low-grade waste heat utilization units.

Further, the high-temperature waste heat recovery equipment includes a flue gas heat exchanger for exchanging the waste heat of the high-temperature flue gas from the smelting furnace and a high-temperature waste hot water tank for storing high-temperature hot water after absorbing the waste heat of the high-temperature flue gas; the The high-temperature residual hot water tank has two high-temperature pipes for transferring heat energy, and the two high-temperature pipes are provided with a circulating water pump and an electromagnetic water valve; The high-temperature pipeline is simultaneously connected with the hot water inlet of the machine-added cleaning board exchange and the auxiliary heating facility; an electromagnetic water valve is arranged on the pipeline connecting the machine-added cleaning board exchange and the hot water inlet of the auxiliary heating facility.

Further, the medium-temperature waste heat recovery equipment includes a quenching tank heat exchanger for exchanging the medium-temperature waste heat generated by the quenching tank and a medium-temperature waste hot water tank for storing the medium-temperature hot water after absorbing the medium-temperature waste heat of the quenching tank; The residual hot water tank has a medium temperature pipeline for transferring heat energy, and the medium temperature pipeline is provided with a circulating water pump and an electromagnetic water valve.

Further, the low-temperature waste heat recovery equipment includes a low-temperature waste water tank for recovering the low-temperature waste heat of the air compressor, the hydraulic station, the die-casting machine and the mold; the low-temperature waste heat tank has a first low-temperature pipeline for transferring thermal energy, and The first low-temperature pipeline is provided with a circulating water pump and an electromagnetic water valve, and the first low-temperature pipeline is communicated with the first-stage low-grade waste heat utilization unit.

Further, the first-stage low-grade waste heat utilization unit includes an evaporator, a condenser and a core compressor connected in sequence; the first low-temperature pipeline is connected to the hot water inlet of the evaporator of the first-stage low-grade waste heat utilization unit, so The condenser of the first-stage low-grade waste heat utilization unit has a second low-temperature pipeline for transferring thermal energy, and a circulating water pump is arranged on the second low-temperature pipeline. The cold water outlet of the evaporator of the first-stage low-grade waste heat utilization unit is connected to the cold water inlet of the cold process plate to be replaced through the first cold water pipeline.

Further, it also includes a secondary low-grade waste heat utilization unit cascaded with a primary low-grade waste heat utilization unit; the secondary low-grade waste heat utilization unit includes an evaporator, a condenser and a core compressor connected in sequence; The cold water outlet of the evaporator of the secondary low-grade waste heat utilization unit is connected to the hot water inlet of the evaporator of the secondary low-grade waste heat utilization unit through the first cold water pipeline, and the cold water outlet of the evaporator of the secondary low-grade waste heat utilization unit passes through the second. The cold water pipeline is connected to the cold water inlet that needs to be replaced by the cold process plate; the condenser of the secondary low-grade waste heat utilization unit has a third low-temperature pipeline for transferring heat energy, and a circulating water pump is arranged on the third low-temperature pipeline. The low temperature pipeline is connected to the hot water inlet of the auxiliary heating facility.

Further, the core compressors of the first-level low-grade waste heat utilization unit and the second-level low-grade waste heat utilization unit are centrifugal compressors; the centrifugal compressor includes a rotating shaft with a centrifugal impeller welded in the middle, and all Both ends of the rotating shaft are connected with the shell of the first-level low-grade waste heat utilization unit or the second-level low-grade waste heat utilization unit through magnetic suspension bearings; two permanent magnet synchronous motors are symmetrically fixed at both ends of the rotating shaft, The permanent magnet synchronous motor includes a stator fixed on the casing of a primary low-grade waste heat utilization unit or a secondary low-grade waste heat utilization unit, and a rotor located inside the stator and fixed on a rotating shaft.

The beneficial effects of the present invention are:

The waste heat heat island system of the invention can recover the high, medium and low temperature waste heat of the wheel hub production line, and use it for downstream processes and auxiliary heat, so as to achieve the purpose of energy recovery and reuse. Among them, the core compressor of the low-grade waste heat utilization unit adopts a centrifugal compressor based on magnetic levitation technology. The centrifugal impeller is placed in the middle of the rotating shaft, and the magnetic levitation bearing and the permanent magnet motor body are symmetrically arranged, which can achieve the purpose of efficient operation and good balance.

Description of drawings

Fig. 1 is the system structure diagram of the present invention;

Fig. 2 is the control flow chart of the present invention;

Fig. 3 is the waste heat utilization logic control diagram of the present invention;

4 is a schematic diagram of the overall structure of the centrifugal compressor of the present invention;

5 is an exploded view of the centrifugal compressor of the present invention;

Fig. 6 is the rotary shaft structure schematic diagram of the present invention;

7 is a schematic diagram of the rotor structure of the permanent magnet synchronous motor of the present invention;

Fig. 8 is the structural representation of the locking nut of the present invention;

Fig. 9 is the structure schematic diagram of the locking ring of the present invention;

In the picture: 1. Coating preheating plate replacement, 2. Electromagnetic water valve, 3. Machine-added cleaning plate replacement, 4. Auxiliary heating facilities, 5. First-class low-grade waste heat utilization unit, 6. Second-class low-grade waste heat utilization Unit, 6-1, centrifugal compressor, 6-1-1, magnetic bearing, 6-1-2, locking ring, 6-1-3, stator, 6-1-4, rotating shaft, 6-1 -5, lock nut, 6-1-6, rotor, 6-1-7, hexagon socket head cap screw, 6-1-2-1, countersunk hole, 6-1-2-2, anti-loosening boss, 6-1-4-1, Guide groove, 6-1-4-2, Centrifugal impeller, 6-1-4-3, Step table, 6-1-4-4, Rotating shaft thread, 6-1-5 -1, Internal thread, 6-1-5-2, threaded hole, 6-1-6-1, rotor boss, 6-1-6-2, permanent magnet, 7, need to change the cold process plate, 8, Low temperature waste heat recovery equipment, 9, medium temperature waste heat recovery equipment, 10, circulating water pump, 11, high temperature waste heat recovery equipment.

Detailed ways

In order to facilitate the understanding of the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. It should be understood by those skilled in the art that the embodiments are only for helping the understanding of the present invention, and should not be regarded as a specific limitation of the present invention.

The invention provides a waste heat heat island heating method based on a wheel hub production line, including the following processes:

Recover the high-temperature waste heat of the smelting furnace in the wheel production line, recover the medium-temperature waste heat generated by the quenching tank in the wheel production line, and recover the low-temperature waste heat of the hollow compressor, hydraulic station, die-casting machine and mold in the wheel production line, and obtain high-temperature waste heat energy, Medium-temperature waste heat energy and low-temperature waste heat energy; step heating according to the preset priority: high-temperature waste heat energy is given priority to supply the heat for painting pretreatment, and the heat for painting pretreatment is only supplied by high-temperature waste heat energy. If the high-temperature heat is abundant, then The remaining high-temperature waste heat is supplied to the machine for cleaning and auxiliary heat, and the machine-added cleaning and auxiliary heat facilities can be supplied by high, medium and low temperature waste heat energy; At the same time, the energy supplies heat to the machine cleaning; if the machine cleaning supply is sufficient, the high, medium and low temperature waste heat energy supplies heat to the auxiliary heating facilities.

The evaporative condensation method is used to first increase the temperature of the low-temperature waste heat energy, and then supply it to the machine cleaning or auxiliary heating facilities; the cold water produced during the heating process is used for the cooling process in the wheel hub production line.

As shown in Figure 1, the present invention provides a waste heat island system based on a wheel hub production line, including high temperature waste heat recovery equipment 11, medium temperature waste heat recovery equipment 9, low temperature waste heat recovery equipment 8, coating preheating plate replacement 1, machining Cleaning board replacement 3, auxiliary heat facilities 4, first-level low-grade waste heat utilization unit 5 and process board replacement 7; high-temperature waste heat recovery equipment 11 is used to recover the high-temperature flue gas waste heat of the smelting furnace in the wheel hub production line, and will be recycled The high temperature waste heat energy is transferred to the coating preheating plate changer 1, the machine cleaning plate changer 3 and the auxiliary heat facility 4; the medium temperature waste heat recovery equipment 9 is used to recover the medium temperature waste heat generated by the quenching tank in the wheel hub production line, and will be recycled The medium-temperature waste heat energy is transferred to the machine cleaning plate replacement 3 and auxiliary heat facilities 4 respectively; the low-temperature waste heat recovery equipment 8 is used to recover the low-temperature waste heat of the hollow compressor, hydraulic station, die-casting machine and mold of the wheel hub production line. The waste heat utilization unit 5 is used to upgrade the low-temperature waste heat energy recovered by the low-temperature waste heat recovery equipment 8, and transfer it to the machine-added cleaning plate exchange 3 and the auxiliary heat facilities 4 respectively. The first-level low-grade waste heat utilization unit 5 generates during the lifting process The cold water is passed to the cooling process board 7; the coating preheating board 1, the machine cleaning board 3 and the auxiliary heating facilities 4 are respectively used for the preheating of the coating process, the machine cleaning and the auxiliary heating facilities. For hot use, cold process plate is required to change 7 for cooling in the wheel hub production line that requires cold process.

The system also includes a main circulation pipeline; the main circulation pipeline is used to replenish water for the high-temperature waste heat recovery equipment 11, the medium-temperature waste heat recovery equipment 9 and the low-temperature waste heat recovery equipment 8 respectively, and for the replacement of the coating preheating plate 1 and the machine-added cleaning plate. 3. Drainage of auxiliary heating facilities 4 and first-grade low-grade waste heat utilization unit 5.

The high temperature waste heat recovery device 11 includes a flue gas heat exchanger for exchanging the waste heat of the high temperature flue gas from the smelting furnace and a high temperature waste water tank for storing the high temperature hot water after absorbing the waste heat of the high temperature flue gas; the water inlet of the high temperature waste water tank The pipeline is connected with the main circulation pipeline, and the high-temperature residual hot water tank has two high-temperature pipelines for transferring heat energy, and the two high-temperature pipelines are provided with a circulating water pump 10 and an electromagnetic water valve 2; one of the high-temperature pipelines is connected to the painting preheating plate The hot water inlet of exchange 1 is connected, and the other high-temperature pipe is connected to the hot water inlet of machine cleaning plate exchange 3 and auxiliary heating facility 4 at the same time; painting preheating plate exchange 1, machine cleaning plate exchange 3 and auxiliary heat The cold water outlet of the facility 4 is respectively connected with the main circulation pipeline through a drain pipe, and an electromagnetic water valve 2 is arranged on the drain pipe. An electromagnetic water valve 2 is arranged on the pipeline connecting between the machine-added cleaning plate exchange 3 and the hot water inlet of the auxiliary heating facility 4 .

The medium-temperature waste heat recovery equipment 9 includes a quenching tank heat exchanger for exchanging the medium-temperature waste heat generated by the quenching tank and a medium-temperature waste water tank for storing the medium-temperature hot water after absorbing the waste heat of the quenching tank; the water inlet pipeline of the medium-temperature waste hot water tank Connected to the main circulating pipeline, the medium-temperature residual hot water tank has a medium-temperature pipeline for transferring heat energy, and the medium-temperature pipeline is provided with a circulating water pump 10 and an electromagnetic water valve 2, and the medium-temperature pipeline is simultaneously exchanged with the machine-added cleaning plate 3 and auxiliary heat The hot water inlet of facility 4 is connected.

The low-temperature waste heat recovery equipment 8 includes a low-temperature waste water tank for recovering the low-temperature waste heat of the air compressor, hydraulic station, die-casting machine and mold; the water inlet pipeline of the low-temperature waste heat tank is connected with the main circulation pipeline, and the low-temperature waste water tank has a heat transfer heat energy. The first low-temperature pipeline, and the first low-temperature pipeline is provided with a circulating water pump 10 and an electromagnetic water valve 2, and the first low-temperature pipeline is communicated with the first-stage low-grade waste heat utilization unit 5.

The first-stage low-grade waste heat utilization unit 5 includes an evaporator, a condenser and a core compressor connected in sequence; the first low-temperature pipeline is connected to the hot water inlet of the evaporator of the first-stage low-grade waste heat utilization unit 5, and the first-stage low-grade waste heat utilization The condenser of the unit 5 has a second low-temperature pipeline for transferring thermal energy, and a circulating water pump 10 is arranged on the second low-temperature pipeline. The inlets are connected to each other; the cold water outlet of the evaporator of the first-level low-grade waste heat utilization unit 5 and the water inlet of the condenser are connected to the main circulation pipeline through branch pipes; the cold water outlet of the evaporator of the first-level low-grade waste heat utilization unit 5 passes through the first The cold water pipeline is connected with the cold water inlet of the process board exchange 7 that needs to be cooled, and the hot water outlet of the process board exchange 7 needs to be cooled is connected with the main circulation pipeline through the branch pipeline.

The system also includes a secondary low-grade waste heat utilization unit 6 cascaded with the primary low-grade waste heat utilization unit 5; the secondary low-grade waste heat utilization unit 6 includes an evaporator, a condenser and a core compressor connected in sequence; The cold water outlet of the evaporator of the waste heat utilization unit 5 is connected to the hot water inlet of the evaporator of the secondary low-grade waste heat utilization unit 6 through the first cold water pipeline, and the cold water outlet of the evaporator of the secondary low-grade waste heat utilization unit 6 passes through the second. The cold water pipeline is connected to the cold water inlet of the process board that needs to be cooled. The condenser of the secondary low-grade waste heat utilization unit 6 has a third low-temperature pipeline for transferring thermal energy, and a circulating water pump 10 is arranged on the third low-temperature pipeline, and the third low-temperature pipeline is connected with the hot water inlet of the auxiliary heating facility 4 .

After the first-level low-grade waste heat utilization unit 5 extracts the low-grade waste heat, the produced cold water is transported to the cooling-required process board 7 for cooling in the wheel hub production line. If the temperature of the cold water does not meet the technological requirements, the secondary low-grade waste heat utilization unit 6 is used to continue to provide heat, and ultra-low temperature cold water is produced for the cooling process. The temperature of the heat extracted by the secondary low-grade waste heat utilization unit 6 is relatively low, and it only supplies heat to the auxiliary heating facilities 4 .

The low-grade waste heat utilization unit is composed of a permanent magnet synchronous motor, a compressor, a condenser, a throttle valve, an evaporator, and a liquid separator (storage). Among them, the bearing of the core compressor adopts a magnetic suspension bearing and is driven by a permanent magnet synchronous motor. This design can realize the high-speed operation of the compressor, improve thermal efficiency, and save energy significantly. At the same time, the heat island management and control module can perform stepless speed regulation on the permanent magnet synchronous motor, and control the heating capacity of the low-grade waste heat utilization unit in real time.

The heat island control module prioritizes the use of high-temperature waste heat and medium-temperature waste heat, and the system automatically calculates the heat demand. When the heat demand is greater than the heat produced at the high and medium temperature, it controls the low-grade waste heat utilization unit to start and controls the low-grade waste heat utilization unit according to the heat demand. The speed of the unit is balanced to achieve heat supply and demand balance , and at the same time avoid the waste of electric energy when the low-grade waste heat utilization unit runs at full speed. When the medium and high temperature waste heat is sufficient, the rotation speed of the permanent magnet synchronous motor can be reduced to reduce the heating capacity of the low-grade waste heat utilization unit; when the medium and high temperature waste heat is insufficient, the rotation speed of the permanent magnet synchronous motor can be increased to increase the heating capacity of the low-grade waste heat utilization unit. Realize the balance of heat supply and demand, and maximize energy conservation and emission reduction.

Figure 2 shows the control flow chart of the present invention. The high-temperature flue gas (300°C) of the aluminum ingot smelting furnace of the wheel hub production line uses the flue gas heat exchanger to exchange the high-temperature waste heat, and then uses the high-temperature circulating water pump to absorb the waste heat. The high-temperature hot water is sent to the high-temperature residual hot water tank for energy storage; for the medium-temperature quenching heat energy (80°C) in the heat treatment process of the casting quenching tank, the medium-temperature residual heat is exchanged by the quenching tank heat exchanger, and the medium-temperature hot water after absorbing the residual heat of the quenching tank passes through The circulating water pump is driven to the medium temperature residual hot water tank for energy storage. Driven by the circulating water pump, the low-temperature water of the wheel hub process mold, die-casting, hydraulic station, and air compressor station is sent to the two-stage low-grade waste heat utilization unit, and the low-temperature heat source and cold source are generated by increasing the heat and reducing the temperature of the circulating water to produce medium-temperature hot water. (60~70℃), and the two-stage low-grade waste heat utilization unit can produce ultra-low temperature cold water (as low as 12℃). The high-temperature waste heat energy (high-temperature hot water) passes through the high-temperature pipeline and is driven by the circulating water pump to supply heat to the pre-coating pretreatment, machining cleaning, and auxiliary heating facilities; the medium-temperature waste heat energy (medium-temperature hot water) passes through the medium-temperature pipeline and is circulated by The water pump drives heat to the machine cleaning and auxiliary heating facilities, and the low-temperature waste heat energy (low temperature hot water) supplies heat to the machine cleaning and auxiliary heating facilities through the low-temperature pipeline.

The entire waste heat energy distribution process is provided by the heat island management and control module according to the preset priority ladder. The high temperature waste heat is given priority to supply the heat for the pretreatment of the coating. The preheating temperature of the coating is high and can only be supplied by the high temperature waste heat. If the heat supply is insufficient, the heating boiler will start to supplement heat; Cleaning and auxiliary heat. Machine cleaning and auxiliary heat can be supplied by high, medium and low temperature waste heat. After the high temperature waste heat meets the heating supply of the coating pretreatment, it will supply heat to the machine cleaning together with the medium and low temperature waste heat. If the heat supply of the machine cleaning is insufficient, the heating boiler will start to make up heat; , Low-temperature waste heat supplies heat to auxiliary heating facilities. If the heat supply does not meet the heat consumption of the auxiliary heating facilities, the heating boiler will start supplementary heat.

The low-temperature cold water produced by the low-grade waste heat utilization system is used as a cold source for refrigeration and air-conditioning and other processes requiring cooling, as well as the cooling water for processes and equipment such as smelting furnaces, quenching tanks, molds, castings, and air compressors. The purpose of cooling and waste heat recollection.

FIG. 3 is a logic control diagram of waste heat utilization of the present invention. The heat island control module controls the high, medium and low temperature heating to be turned on at the same time. Due to the high heating temperature of the coating pretreatment, it can only be heated by the high temperature waste heat. If the high temperature heating cannot meet the heat demand of the coating pretreatment, it needs to be produced by heat Boiler supplementary heat; if the high temperature heat supply fully meets the heat demand of the coating pretreatment, the high temperature heat supply together with the medium temperature waste heat and the low temperature waste heat will supply heat to the machine cleaning process. If the medium, high and low temperature waste heat does not meet the heat requirement of the machine cleaning process, the heat generating boiler needs to supplement heat; if the medium, high and low temperature waste heat fully meets the heat requirement of the machine cleaning process, continue to supply heat to auxiliary heating facilities, including factory heating and factory heating water etc. If the high, medium and low temperature cannot meet the heating requirements of auxiliary heating facilities, boiler supplementary heat is still required. In the process of heating, the first-level low-grade waste heat utilization unit 5 will also produce low-temperature cold water supply and demand cooling processes, including refrigeration for refrigeration and air conditioning, and cooling of process equipment. If the cooling capacity of the primary low-grade waste heat utilization unit 5 cannot meet the cooling process temperature, it is necessary to start the secondary low-grade waste heat utilization unit 6 to heat the cooling water twice to generate ultra-low temperature cold water. At the same time, the heat is directly used for auxiliary Heating with heating facilities.

The core compressors of the primary low-grade waste heat utilization unit 5 and the secondary low-grade waste heat utilization unit 6 both use centrifugal compressors 6-1.

As shown in FIGS. 4 to 9 , the centrifugal compressor 6-1 includes a rotating shaft 6-1-4 with a centrifugal impeller 6-1-4-2 welded in the center, and both ends of the rotating shaft 6-1-4 Both are connected with the shell of the first-level low-grade waste heat utilization unit 5 or the second-level low-grade waste heat utilization unit 6 through the magnetic suspension bearing 6-1-1; the two ends of the rotating shaft 6-1-4 are fixedly provided with a stepped platform 6 -1-4-3, and the step table 6-1-4-3 is fixedly assembled in the inner ring of the magnetic suspension bearing 6-1-1, and the outer ring of the magnetic suspension bearing 6-1-1 is fixed in the first-level low-grade waste heat utilization Unit 5 or secondary low-grade waste heat utilization unit 6 on the shell. The two magnetic suspension bearings 6-1-1 act on the stepped platforms 6-1-4-3 at both ends of the rotating shaft 6-1-4 through electromagnetic force, and hold up the entire rotating shaft 6-1-4, and the electromagnetic force can also limit the The rotating shaft 6-1-4 moves in the axial direction.

The rotating shaft 6-1-4 is made of stainless steel and permanent magnet material, wherein part of the step table 6-1-4-3 is made of permanent magnet material, and the rest is made of stainless steel.

Two permanent magnet synchronous motors are installed symmetrically at both ends of the rotating shaft 6-1-4. The permanent magnet synchronous motor includes a stator 6-1-3 and a rotor 6-1-6. The stator 6-1-3 is made of silicon steel sheets. It is composed of coils, and the stator 6-1-3 is fixed on the shell of the first-level low-grade waste heat utilization unit 5 or the second-level low-grade waste heat utilization unit 6, and the rotor 6-1-6 is located inside the stator 6-1-3. And fixed on the rotating shaft 6-1-4.

The centrifugal compressor 6-1 adopts two permanent magnet synchronous motors symmetrically arranged on the rotating shaft 6-1-4, which can ensure that the centrifugal impeller 6-1-4-2 is always in a state of force balance when rotating at a high speed.

The installation method of the permanent magnet synchronous motor on the rotating shaft 6-1-4 is as follows: both ends of the rotating shaft 6-1-4 are provided with guide grooves 6-1-4-1 along the axial direction, and the guide grooves 6 at each end are provided with guide grooves 6-1-4-1. -1-4-1 are evenly arranged along the circumferential direction;

The rotor 6-1-6 is in the shape of a hollow cylinder, and a plurality of permanent magnets 6-1-6-2 are uniformly pasted on its outer wall along the circumferential direction, and a plurality of rotor bosses 6-1-6-2 are uniformly and fixedly arranged on its inner wall along the circumferential direction. 1-6-1, and the rotor boss 6-1-6-1 is compatible with the guide groove 6-1-4-1, but the length of the guide groove 6-1-4-1 is slightly larger than the rotor boss 6- 1-6-1 length. The rotor 6-1-6 is installed on the rotating shaft 6-1-4 through the rotor boss 6-1-6-1 and the guide groove 6-1-4-1, and rotates synchronously with the rotating shaft 6-1-4.

The guide groove 6-1-4-1 on the rotating shaft 6-1-4 is provided with a rotating shaft thread 6-1-4-4 on the shoulder side, and the two rotors 6-1-6 are respectively installed on the rotating shaft 6- After the two ends of 1-4 are installed, the rotor 6-1-6 and the rotating shaft 6-1-4 are fixed on the two ends of the rotating shaft 6-1-4 by installing the lock nuts 6-1-5 respectively. Together. The lock nut 6-1-5 is installed on both ends of the rotating shaft 6-1-4 through the inner thread 6-1-5-1 which is matched with the rotating shaft thread 6-1-4-4, and the rotor 6- 1-6 Axial locking.

In order to prevent the lock nut 6-1-5 from loosening, a locking ring 6-1-2 is also installed on the outer end of the lock nut 6-1-5. A plurality of anti-loosening bosses 6-1-2-2 are evenly and fixedly arranged on the inner wall of the anti-loosening ring 6-1-2, and the anti-loosening bosses 6-1-2-2 are also connected with the guide grooves 6-1-4. -1 is matched, and the anti-loosening ring 6-1-2 is installed on both ends of the rotating shaft 6-1-4 through the cooperation of the anti-loosening boss 6-1-2-2 and the guide groove 6-1-4-1 , and a plurality of countersunk holes 6-1-2-1 are evenly opened on the anti-loosening ring 6-1-2, and a plurality of threaded holes 6-1-5-2 are evenly opened on the locking nut 6-1-5 , use the socket head cap screw 6-1-7 to pass through the countersunk head hole 6-1-2-1 and screw it into the threaded hole 6-1-5-2, connect the lock ring 6-1-2 with the lock nut 6- 1-5 are fixedly connected together to prevent the lock nut 6-1-5 from rotating in the axial direction, and effectively prevent the lock nut 6-1-5 from loosening.

The heating capacity (cooling capacity) of the first-level low-grade waste heat utilization unit 5 and the second-level low-grade waste heat utilization unit 6 varies with the rotation speed of the rotating shaft 6-1-4. The control system monitors the improvement of the two low-grade waste heat utilization units through the temperature sensor. Heat (cooling capacity), if the temperature is lower (higher) than the required heating capacity (cooling capacity), control the centrifugal compressor 6-1 to increase the speed to increase the heating capacity (cooling capacity); if the heating temperature is too high High (cooling temperature is too low) exceeds the set value of the equipment, then control the centrifugal compressor 6-1 to reduce the speed to prevent the equipment from overloading.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, and substitutions can be made in these embodiments without departing from the principle and spirit of the invention and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (5)

1. A waste heat heat island system based on a wheel hub production line, characterized in that: comprising high temperature waste heat recovery equipment (11), medium temperature waste heat recovery equipment (9), low temperature waste heat recovery equipment (8), coating preheating plate replacement (1) ), machine-added cleaning plate replacement (3), auxiliary heating facilities (4), first-class low-grade waste heat utilization unit (5), and cold process plate replacement (7); The high-temperature waste heat recovery equipment (11) is used to recover the high-temperature flue gas waste heat of the smelting furnace in the wheel hub production line, and transfer the recovered high-temperature waste heat energy to the coating preheating plate changer (1) and the machine cleaning plate changer (1). 3) and auxiliary heating facilities (4); The medium-temperature waste heat recovery equipment (9) is used to recover the medium-temperature waste heat generated by the quenching tank in the wheel hub production line, and transfer the recovered medium-temperature waste heat energy to the machine-added cleaning plate exchange (3) and the auxiliary heat facility (4) respectively; The low-temperature waste heat recovery equipment (8) is used to recover the low-temperature waste heat of the air compressor, hydraulic station, die-casting machine and mold in the wheel hub production line, and the first-level low-grade waste heat utilization unit (5) is used to improve the low-temperature waste heat recovery equipment ( 8) The recovered low-temperature waste heat energy is transferred to the machine-added cleaning plate exchange (3) and auxiliary heat facilities (4) respectively; the first-level low-grade waste heat utilization unit (5) produces cold water during the lifting process Pass it to the need for cold process plate change (7); The coating preheating plate changer (1), the machine-added cleaning plate changer (3) and the auxiliary heating facilities (4) are respectively used for the preheating of the coating process, the machine-added cleaning and the heating of the auxiliary heating facilities, The cold process plate changer (7) is used for refrigeration in the wheel hub production line requiring cold process; The high-temperature waste heat recovery device (11) includes a flue gas heat exchanger for exchanging high-temperature flue gas residual heat from the smelting furnace and a high-temperature residual hot water tank for storing high-temperature hot water after absorbing the high-temperature flue gas residual heat; the The high-temperature residual hot water tank has two high-temperature pipes for transferring heat energy, and the two high-temperature pipes are provided with a circulating water pump (10) and an electromagnetic water valve (2); one of the high-temperature pipes is exchanged with the painting preheating plate (1). ) is connected to the hot water inlet of ), and another high-temperature pipeline is connected to the hot water inlet of the machine-added cleaning plate exchange (3) and the auxiliary heat facility (4); the machine-added cleaning plate exchange (3) and the auxiliary heat facility (4) An electromagnetic water valve (2) is arranged on the pipeline connected between the hot water inlets; The medium-temperature waste heat recovery device (9) includes a quenching tank heat exchanger for exchanging the medium-temperature waste heat generated by the quenching tank and a medium-temperature waste hot water tank for storing the medium-temperature hot water after absorbing the medium-temperature waste heat of the quenching tank; the medium-temperature waste heat The residual hot water tank has a medium temperature pipeline for transferring heat energy, and a circulating water pump (10) and an electromagnetic water valve (2) are arranged on the medium temperature pipeline. The medium temperature pipeline is simultaneously exchanged with the machine-added cleaning plate (3) and auxiliary heat facilities. (4) The hot water inlet is connected; The low-temperature waste heat recovery device (8) includes a low-temperature waste water tank for recovering low-temperature waste heat of an air compressor, a hydraulic station, a die-casting machine and a mold; the low-temperature waste water tank has a first low-temperature pipeline for transferring thermal energy, and The first low-temperature pipeline is provided with a circulating water pump (10) and an electromagnetic water valve (2), and the first low-temperature pipeline is communicated with the primary low-grade waste heat utilization unit (5); The first-stage low-grade waste heat utilization unit (5) includes an evaporator, a condenser and a core compressor connected in sequence; the first low-temperature pipeline and the hot water inlet of the evaporator of the first-stage low-grade waste heat utilization unit (5) Connected, the condenser of the first-stage low-grade waste heat utilization unit (5) has a second low-temperature pipeline for transferring thermal energy, and a circulating water pump (10) is arranged on the second low-temperature pipeline, and the second low-temperature pipeline is connected to the machine at the same time. The washing plate exchange (3) is connected with the hot water inlet of the auxiliary heating facility (4); the cold water outlet of the evaporator of the first-level low-grade waste heat utilization unit (5) is exchanged with the cold process plate through the first cold water pipeline (7) The cold water inlet is connected; The waste heat island system based on the wheel hub production line further includes a secondary low-grade waste heat utilization unit (6) cascaded with the primary low-grade waste heat utilization unit (5); the secondary low-grade waste heat utilization unit (6) includes The evaporator, the condenser and the core compressor are connected in sequence; the cold water outlet of the evaporator of the first-stage low-grade waste heat utilization unit (5) passes through the first cold water pipeline and the evaporator of the second-stage low-grade waste heat utilization unit (6) The cold water outlet of the evaporator of the secondary low-grade waste heat utilization unit (6) is connected to the cold water inlet of the cooling process plate exchange (7) through the second cold water pipeline; the secondary low-grade waste heat utilization unit The condenser of (6) has a third low-temperature pipeline for transferring thermal energy, and a circulating water pump (10) is arranged on the third low-temperature pipeline, and the third low-temperature pipeline is connected to the hot water inlet of the auxiliary heating facility (4). 2. The waste heat heat island system based on a wheel hub production line according to claim 1, characterized in that: it further comprises a main circulation pipeline; the main circulation pipeline is used for respectively reclaiming high temperature waste heat recovery equipment (11) and medium temperature waste heat recovery equipment ( 9) and low-temperature waste heat recovery equipment (8) for water replenishment, and used for coating preheating plate replacement (1), machine-added cleaning plate replacement (3), auxiliary heat facilities (4) and first-class low-grade waste heat utilization unit (5) Drainage. 3. The waste heat heat island system based on a wheel hub production line according to claim 1, characterized in that: the core compressors of the first-level low-grade waste heat utilization unit (5) and the second-level low-grade waste heat utilization unit (6) are equal to each other. A centrifugal compressor (6-1) is used; the centrifugal compressor (6-1) includes a rotating shaft (6-1-4) with a centrifugal impeller (6-1-4-2) welded in the middle, and Both ends of the rotating shaft (6-1-4) pass through the magnetic suspension bearing (6-1-1) and the shell of the primary low-grade waste heat utilization unit (5) or the secondary low-grade waste heat utilization unit (6). Connected; two permanent magnet synchronous motors are fixedly installed symmetrically at both ends of the rotating shaft (6-1-4), and the permanent magnet synchronous motors include a low-grade waste heat utilization unit (5) fixed at the first stage or the second stage. The stator (6-1-3) on the casing of the low-grade waste heat utilization unit (6) and the rotor (6) located inside the stator (6-1-3) and fixed on the rotating shaft (6-1-4) -1-6). 4. A heating method based on the waste heat heat island system of a wheel hub production line as claimed in claim 1, characterized in that: the method comprises the following process: Recover the high-temperature waste heat of the smelting furnace in the wheel production line, recover the medium-temperature waste heat generated by the quenching tank in the wheel production line, and recover the low-temperature waste heat of the hollow compressor, hydraulic station, die-casting machine and mold in the wheel production line, and obtain high-temperature waste heat energy, Medium temperature waste heat energy and low temperature waste heat energy; Step heating according to the preset priority: the high-temperature waste heat energy is given priority to supply the heat for pre-painting, and the heat for pre-coating is only supplied by the high-temperature waste heat energy. and auxiliary heat, and the machine cleaning and auxiliary heat facilities can be supplied by high, medium and low temperature waste heat energy; after the high temperature waste heat energy meets the heating supply of the coating pretreatment, together with the medium and low temperature waste heat energy, it simultaneously supplies heat to the machine cleaning ; If the machine cleaning supply is sufficient, the high, medium and low temperature waste heat energy will supply heat to the auxiliary heating facilities. 5. the heating method based on the waste heat heat island system of wheel hub production line according to claim 4, it is characterized in that: adopt the method of evaporative condensation to raise the temperature of low temperature waste heat energy first, then supply to machine plus cleaning or auxiliary heat facilities ; The cold water produced in the heating process is used for refrigeration in the wheel hub production line that requires a cold process.

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