CN107289325B - Automatic recovery processing device of sulfur hexafluoride - Google Patents
Automatic recovery processing device of sulfur hexafluoride Download PDFInfo
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- CN107289325B CN107289325B CN201710656640.1A CN201710656640A CN107289325B CN 107289325 B CN107289325 B CN 107289325B CN 201710656640 A CN201710656640 A CN 201710656640A CN 107289325 B CN107289325 B CN 107289325B
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- F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
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Abstract
The invention provides an automatic sulfur hexafluoride recovery processing device, which is characterized in that: comprises a gas storage device, a filtering system, a compression system, a pipeline system and an electric control system which are arranged on a supporting device; the filtering system comprises a particle filter and a moisture filter; the compression system comprises a compressor and a recovery pump; the pipeline system comprises pipelines connected among the devices and control valves on the pipelines; the electric control system comprises a sensor, an electric control element and an instrument display device. After the compressor is magnetically coupled by the non-oil lubrication leakage-free non-metal isolation sleeve, the recovered gas does not contain oil, the regeneration treatment of the gas is very simple and easy, the equipment does not leak, and the influence on the environment is reduced to the minimum. Meanwhile, the maintenance is simple and easy, the cost is reduced, and the maintenance is faster.
Description
Technical Field
The invention relates to the technical field of SF6 application such as electric power, metallurgy, aerospace and the like, in particular to an automatic sulfur hexafluoride recovery and treatment device.
Background
Sulfur hexafluoride gas is an excellent insulating and arc extinguishing gas, and is widely used in various electrical equipment. In order to ensure the normal operation of the equipment, the oil SF6 gas is usually sealed in the equipment and kept at a certain pressure. SF6 gas is nontoxic, but the decomposition products thereof have great harm to the environment, which is mainly shown in that the decomposition products thereof contain acidic substances, particularly HF and SO2, have toxicity and corrosiveness, not only influence the service life of equipment, but also pollute the environment, harm the safety of personnel and cause waste of resources. When the equipment works, gas loss caused by leakage, discharge and the like exists, and the equipment needs to be supplemented with gas for maintenance and sometimes needs to be recycled.
Chinese patent 201210399570.3 provides a tail gas recovery device for sulfur hexafluoride gas test instrument, comprising: an external gas storage tank and a tail gas recovery device main body; the tail gas recovery device main body comprises an inlet of a gas source to be detected; and a mass flow controller is arranged between the inlet of the gas source to be detected and the gas inlet of the instrument, and is in sealing connection with the buffer tank, the gas pump, the one-way valve, the recharging pipeline and the external gas storage tank, and finally the sulfur hexafluoride tail gas after being recycled and compressed is conveyed to the external gas storage tank for storage. The invention can realize zero emission of the sulfur hexafluoride gas test tail gas, and has the advantages of good portability, strong recovery capability and wide application range.
Chinese patent 201620886421.3 discloses a sulfur hexafluoride gas filtering and recycling integrated device, which comprises a vacuum system, a compression system, a purification system, a storage system and a condensation system, wherein the vacuum system comprises an oil-free vacuum pump, the purification system comprises an oil removal filter, a regeneration drying filter and a solid particle filter, the storage system comprises a storage tank, the compression system comprises a sulfur hexafluoride high-pressure compressor, the high-pressure compressor is externally connected with the purification system, and the purification system is connected with a condenser in the condensation system; an electromagnetic valve is arranged between the condenser and the storage tank, a self-sealing joint is arranged at the outlet end of the electromagnetic valve, and an electric contact pressure gauge is arranged at the outlet of the high-pressure compressor. This prior art simplifies the high pressure liquefaction and the low pressure condensation liquefaction two kinds of modes and fuses into high pressure condensation liquefaction, has reduced the process, reaches high efficiency, low-cost effect.
The above prior art also has the following drawbacks: the lubricating oil in the compressor can enter the recovered gas in the recovery and compression process to cause secondary pollution of the gas, so that the gas is not easy to regenerate, and even if the gas is treated, the consumption is large, the loss is large, the gas is not easy to control, the oil removal filter has short service life, and the replacement causes pollution discharge. According to the requirement of environmental protection, SF6 can not leak, but the compressor with oil lubrication has the structural characteristics that the compressor can not be completely sealed, and gas leakage causes environmental pollution in the compression process.
Disclosure of Invention
The invention provides an automatic sulfur hexafluoride recovery processing device, aiming at solving the problems of gas pollution and compression leakage caused by lubricating oil in the prior art.
The technical scheme of the invention is as follows:
the utility model provides an automatic recovery processing device of sulfur hexafluoride which characterized in that: comprises a gas storage device, a filtering system, a compression system, a pipeline system and an electric control system which are arranged on a supporting device; the filtering system comprises a particle filter and a moisture filter; the compression system comprises an oil-free compressor and a recovery pump; the pipeline system comprises pipelines connected among the devices and control valves on the pipelines; the electrical control system comprises a sensor, an electrical control element and an instrument display device; the compression system adopts oil-free lubrication without lubricating oil.
On the basis, the sulfur hexafluoride automatic recovery processing device further comprises a vacuum pumping system, wherein the vacuum pumping system comprises a vacuum pump, a piston type vacuum coaxial valve taking vacuum as a power gas source, a vacuum pressure sensor and a vacuum breaking ball valve which are sequentially connected through a pipeline; the piston type vacuum coaxial valve taking vacuum as a power air source can effectively prevent lubricating grease from flowing back to enter a recovery device and a vacuumized product.
On the basis, the sulfur hexafluoride automatic recovery processing device further comprises an air charging system, wherein the air charging system comprises an external heating type evaporator, a pressure reducer, a one-way valve, a moisture particle filter, a control valve and a pressure sensor; the external heating type evaporator is used for heating and gasifying liquid SF6 during air inflation.
On the basis, the whole operation process of the sulfur hexafluoride automatic recovery processing device adopts PLC program automatic control: inputting a recovery final pressure value on a control terminal to realize automatic recovery shutdown; setting inflation pressure on a control terminal to carry out automatic constant-pressure inflation; the vacuum value is set on the control terminal to realize the automatic stop of the vacuum pumping and the time delay is set to ensure that the vacuum is more thorough.
The control terminal is a touch screen or an industrial control computer.
On this basis, the sulfur hexafluoride automatic recovery processing device has the following recovery processes of the recovered gas:
1) Enabling sulfur hexafluoride waste gas to be recovered to pass through a particle filter to remove specific pollutants;
2) There are two cases: when the pressure of the waste gas is higher than the atmospheric pressure value, the waste gas firstly passes through the pressure reducer and then enters the compressor;
3) The compressed gas passes through a moisture particle filtering device and then enters a gas storage device.
The invention also provides an automatic sulfur hexafluoride recovery processing device comprising a piston type vacuum coaxial valve taking vacuum as a power air source, and the technical scheme is as follows:
the utility model provides an automatic recovery processing device of sulfur hexafluoride, includes gas storage device, filtration system, compression system, pipe-line system, electric control system, evacuation system, its characterized in that: the vacuum pumping system is characterized in that a piston type vacuum coaxial valve which takes vacuum as a power air source is arranged on a pipeline at the front end of the vacuum pump and is used for protecting the vacuum pump from being damaged by positive pressure.
On the basis, the piston type vacuum coaxial valve taking vacuum as a power air source comprises a coaxial valve part and an electromagnetic valve part, wherein the coaxial valve part takes vacuum as a power source and comprises a piston type valve core, a cylinder barrel, a pressing block, a sealing ring and a sealing valve seat, and the electromagnetic valve part comprises an electromagnetic control device; the piston type valve core is cylindrical, is sleeved in the cylinder barrel and can move back and forth; the side wall of the cylinder barrel is provided with a vent hole, and two ends of the cylinder barrel are provided with sealing blocks for sealing a sleeving gap between the piston type valve core and the cylinder barrel; the outer end of the sealing block is provided with a pressing block for pressing the sealing block; a sealing valve seat is also arranged at the outlet end of the piston type valve core and used for sealing the port of the piston type valve core; the electromagnetic control device is communicated with the side wall of the cylinder barrel through one end of a pipeline, and the other end of the electromagnetic control device is communicated with a pressing block outside the sealing valve seat; the sealing ring is positioned on the mutual contact surface among all the parts.
The outer wall of the piston type valve core is provided with an annular step, an annular groove is formed in the step, a piston sealing ring is nested in the annular groove, and the piston sealing ring is in sealing contact with the inner wall of the cylinder barrel; the side wall of the inlet end of the piston type valve core is sleeved with a spring, one end of the spring is propped against the cross section of the sealing block, and the other end of the spring is propped against the side face of the annular step.
The side wall of the cylinder barrel is provided with two vent holes which are respectively communicated with spaces on two sides of the annular step of the piston type valve core, wherein the vent hole at the inlet end is communicated with the electromagnetic control device through a pipeline, and the vent hole at the outlet end is communicated with the atmosphere.
The sealing block is in a cake shape with a hole in the middle, the outer wall of the cake is provided with an annular groove, an elastic sealing ring is nested in the groove, and the elastic sealing ring is elastically contacted and sealed with the inner wall of the pressing block; the inner wall of the middle hole is provided with an annular groove, an elastic sealing ring is nested in the groove, the sealing blocks are sleeved on the outer walls of two ends of the piston type valve core, and the elastic sealing ring is elastically contacted and sealed with the outer wall of the piston type valve core; the section of the sealing block is abutted against the port of the cylinder barrel; the edge of the sealing block at the outlet end is also provided with a flange extending outwards.
The pressing block is positioned on the outer side of the sealing block, a cylindrical fluid channel is arranged inside the pressing block, and steps are arranged inside the pressing block to form 2-3 sections of cylindrical channels with different diameters; the cylinder barrel and the sealing block are sleeved in the barrel diameter of the pressing block; the innermost step of the pressing block at the inlet end is abutted against the port of the piston type valve core; the side wall of the pressure block at the outlet end is provided with an air hole and is communicated with an electromagnetic control device through a pipeline; the left and right pressing blocks are connected and fastened through bolts.
The sealing valve seat is in a round cake shape, the edge of the cross section of the sealing valve seat is abutted against the edge folding end face of the sealing block, a round elastic sealing gasket is arranged at the center of the round cake-shaped cross section, the diameter of the elastic sealing gasket is larger than or equal to that of the piston type valve core, and the elastic sealing gasket and the outlet end of the piston type valve core form elastic sealing; as an optional embodiment of the present invention, the elastic sealing gasket is in a circular cake shape, and the diameter of the elastic sealing gasket is larger than the outer diameter of the piston type valve core; as another optional embodiment of the present invention, the elastic sealing gasket is circular, and the circular cross section of the elastic sealing gasket covers the cross section of the port of the piston type valve core; the sealing valve seat is also provided with a plurality of through holes at the outer edge of the elastic sealing gasket, and the through holes are correspondingly distributed on the annular section between the piston type valve core and the cylinder barrel.
The outlet end of the piston type valve core is in an inner cone shape, a knife edge is formed at the edge of the outer wall of the port to form an annular sealing knife, and the annular sealing knife is abutted to an elastic sealing gasket in the center of the sealing valve seat to form elastic sealing.
The electromagnetic control device includes: the electromagnetic valve comprises a two-position three-way electromagnetic valve, an electromagnetic valve spring and an electromagnetic valve core; one port of the two-position three-way electromagnetic valve is communicated with the atmosphere, one port of the two-position three-way electromagnetic valve is communicated with the vent hole at the inlet end of the cylinder barrel, and the other port of the two-position three-way electromagnetic valve is communicated with the vent hole of the pressing block at the outlet end.
When the coaxial valve is opened, a vent hole at the outlet end of the cylinder barrel is communicated with a pressing block at the outlet end through a pipeline and a two-position three-way electromagnetic valve; when the coaxial valve is closed, the vent hole at the inlet end of the cylinder barrel is communicated with the atmosphere through a pipeline and a two-position three-way electromagnetic valve.
The gas or other media has bidirectional flow control, and the fluid in the inlet end pipeline is positive pressure or vacuum negative pressure; when the valve is closed, the valve can bear vacuum and positive pressure without leakage, and simultaneously, the vacuum pump is suddenly stopped in positive vacuum, the piston type vacuum coaxial valve taking vacuum as a power air source loses vacuum power and is automatically closed, so that the problem that the vacuum pump oil reflows due to reverse differential pressure of the vacuum pump is effectively prevented.
The invention also provides an automatic sulfur hexafluoride recovery processing device of the oil-free compressor, which comprises the magnetic coupling device, and the technical scheme is as follows:
an automatic sulfur hexafluoride recovery and treatment device comprises a gas storage device, a filtering system, a compression system, a pipeline system and an electric control system; the method is characterized in that: the compression system adopts a magnetic coupling power transmission compressor which is lubricated without oil and sealed and isolated by a non-metallic isolation sleeve.
On the basis of the above-mentioned technical scheme,
the compressor comprises an eccentric axle box, a high-pressure cylinder, a low-pressure cylinder, a piston, a transmission shaft, an eccentric shaft, a bearing shaft and a magnetic coupling device; the compressor is provided with three cylinders, one high-pressure cylinder is distributed at the upper part of the eccentric shaft box, two low-pressure cylinders are distributed at two sides of the lower part of the eccentric shaft box, the high-pressure cylinder and the low-pressure cylinders are distributed in an inverted Y-shaped structure, and the three cylinders are staggered at an included angle of 120 degrees and are not arranged on the same plane; the pistons are connected with the eccentric shaft through connecting rods, and the three pistons are staggered by 120 included angles; two ends of the eccentric shaft are respectively connected with the transmission shaft and the supporting shaft; the magnetic coupling device drives the transmission shaft to move.
And lubricating oil is not added in all transmission parts in the eccentric axle box.
The inlet of the low-pressure cylinder is communicated with the eccentric shaft box, and the outlet of the low-pressure cylinder is communicated with the inlet of the high-pressure cylinder through a pipeline.
Lubricating media are not added among the high-pressure cylinder, the low-pressure cylinder and the piston, the piston ring is made of a self-lubricating non-metallic material, and the non-metallic material is made by taking polytetrafluoroethylene as a base body and adding carbon fiber and polyimide for mixing.
The magnetic coupling device adopts direct-coupled magnetic coupling transmission and comprises an inner magnetic circuit and an outer magnetic circuit, the eccentric axle box is in full-sealed isolation with the outside atmosphere through a non-metal isolation sleeve, and the inner magnetic circuit and the outer magnetic circuit are isolated by the non-metal isolation sleeve.
The non-metal isolation sleeve is formed by using nylon and glass fiber as main materials.
Two-stage compression is adopted in the compression process, two low-pressure cylinders carry out one-stage compression on gas, and the high-pressure cylinder further carries out two-stage compression on the gas.
The displacement of a high-pressure cylinder of the oil-free gas compressor is 6-60M 3 And h, the output pressure is more than 6MPa.
The gas enters the eccentric shaft box from the inlet of the pneumatic cylinder, takes away the heat of the bearing in the eccentric shaft box in the flowing process, and enters the high-pressure cylinder through the outlet of the low-pressure cylinder.
The outer walls of the low-pressure cylinder and the high-pressure cylinder are provided with a plurality of radiating fins with fin-shaped structures; the outer walls of the high-pressure cylinder and the low-pressure cylinder are provided with cooling devices; the cooling device adopts fan to carry out forced air cooling.
Two ends of the eccentric shaft are provided with inertia balance wheels, and are respectively connected with the support shaft and the transmission shaft through the inertia balance wheels; the inertia balance wheel is provided with a balance sheet, and the low-pressure cylinder and the high-pressure cylinder are positioned between the two inertia balance wheels; and a spacer ring is arranged between the eccentric shaft and the inertia balance wheel.
Compared with the prior art, the invention has the beneficial effects that:
1) After the invention adopts the oil-free lubrication and leakage-free non-metal isolation sleeve magnetic coupling power transmission compressor, the recovered gas does not contain oil, the regeneration treatment of the gas is very simple and easy, and the device has no leakage, thereby reducing the influence on the environment to the minimum. Meanwhile, even if the rotating part of the compressor is abraded after the compressor runs for a long time to cause a fault, the magnetic coupling power transmission slips without causing further damage to parts of the compressor head under the condition that the motor does not stop working, so that the maintenance is simple and easy, the cost is reduced, and the maintenance is faster.
2) In the technical scheme of the invention, the vacuum function can not only vacuumize the equipment per se but also vacuumize the recovered product. The invention adopts the piston type vacuum coaxial valve which takes vacuum as a power air source to be used in front of the vacuum pump, so that the vacuum pump is protected when the pipeline is in positive pressure, and when the inlet of the pump is in positive pressure, the valve is automatically closed and cannot be opened, thereby protecting the safety of the pump. When the inlet is in a state without positive pressure, the vacuum pump is started to provide vacuum power for the valve, and the valve is automatically opened at the moment to connect the processed product with a vacuum pipeline of the equipment to complete the vacuum function.
3) The invention adopts vacuum as a coaxial valve of a power source, and does not need a power air source. The valve has the particular advantage that once the vacuum pump is stopped, whether intentionally or otherwise, the vacuum power source is lost and the valve automatically closes immediately, preventing oil from entering the product being treated due to vacuum in the stopped state, protecting the product from contamination, otherwise treating the oil inside the product is very complicated and expensive. In this regard, compared with other prior art, no matter whether an electromagnetic coaxial valve, an electric valve or a manual ball valve is adopted, automatic closing protection in an emergency state cannot be achieved. In the prior art, once the electromagnetic valve fails or the valve is manually forgotten to be closed, the pump oil can quickly flow back to the product as long as the vacuum pump is stopped, and the result is unimaginable. Moreover, such problems sometimes occur.
4) According to the invention, through the PLC and the pressure sensor, the gas recovery process is not stopped, the electromagnetic valve is closed for a short time, the measured pressure of the sensor is compared with the set pressure, then the valve is controlled, through the program design, the automatic measurement and comparison are carried out for a plurality of times within the designed upper and lower limit ranges, and the recovery device is automatically stopped until the set pressure value, so that the gas recovery control failure caused by inaccurate operation of workers when the gas is recovered is avoided. The prior art device has no parameter setting input, and the device is shut down only by observing and operating by personnel, or only has a default final pressure value, and the device is automatically shut down after the value is reached, so that the recovery final pressure cannot be set at will. The use limitation is large.
5) The automatic recovery processing device has a constant-pressure inflation function, and adopts a PLC program to set inflation pressure for automatic constant-pressure inflation, so that even if the inflation pressure values of products are different in requirement, the equipment can perform constant-pressure inflation according to a flow programmed by the program as long as the required inflation value is set. The constant-pressure inflation function of the invention has the advantages that:
a. the inflation pressure infinitely approaches to a set value but cannot exceed the set value, and particularly in the inflation places where some products have the requirement of differential pressure, the products can be effectively protected from deformation caused by the differential pressure. In this regard, pressure-difference-requiring products have been almost impossible to do with manually adjustable pressure reducer inflators in the prior art.
b. The explosion-proof protective film of the product can not be damaged. The product is often protected by an explosion-proof membrane, and during inflation, the instantaneous pressure required by inflation cannot exceed the pressure of the explosion-proof membrane, otherwise the product performance is influenced or the explosion-proof membrane is directly damaged by impact, so that the product is damaged. The existing equipment is inflated manually by manually adjusting a pressure regulator, the pressure is difficult to ensure, the phenomenon that products are damaged by flushing occurs, and even familiar operators have poor confidence.
6) The invention adopts PLC program to set vacuum value, automatically stops the vacuum pumping and sets time delay to make the vacuum more thorough. Because the inner wall of the pipeline has resistance to the airflow during the vacuum pumping, when the instrument displays the vacuum value, the numerical value is found to rebound and rise all the time after the machine is stopped, which is mainly caused by air resistance, so that an operator needs to watch the equipment and continuously and repeatedly start the equipment to achieve the required vacuum value. The device of the invention measures the value of the vacuum degree by automatically opening and closing the valve under the condition of no shutdown through a pre-programmed program, and the function is automatically stopped until the required vacuum degree is met.
Compared with the prior art, the function has two characteristics to be explained:
a. for the product vacuumizing with the differential pressure requirement, the traditional equipment cannot be controlled, and the product is easy to deform and influence the product quality due to the fact that the product exceeds the differential pressure range.
b. For products with high vacuum requirements, the device of the invention adds an automatic delay shutdown function in the program, delay time calculation input is carried out according to products with different volumes, the vacuum requirements of the delayed products are met to the maximum extent, and personnel are not needed to watch. Conventional equipment must be operated and attended by personnel, and if neglected, the equipment is likely to run for a long time and have potential risks of high-temperature aging, failure and the like.
7) The invention adopts the external heating type evaporator to heat and gasify the liquid SF6 during charging, and adopts the external heating type heating to ensure that the heater heats more uniformly and reduce the local high temperature condition, so that the gas is heated uniformly, the rapid increase of the pressure of the heater caused by the rapid expansion of the volume can not be caused, and the whole process is gentle and stable in heating, safe and reliable. Meanwhile, due to the surrounding heating, the maintenance is very convenient, the pipeline and related sealing do not need to be dismantled, and the device is economical and applicable. The traditional evaporator adopts an internal heating pipe heating mode, the temperature of the surface of a heating pipe is very high, and the part far away from the heating pipe is heated slowly, so that the temperature and the pressure have sudden changes, and the stability is poor. And because the evaporator is installed in a sealed evaporator, the sealing is difficult to be made and easy to leak, if a heating pipe fails, the evaporator needs to be opened to be repaired or replaced, the cost is high, the sealing is difficult to be made, and the period is long.
Drawings
FIG. 1 is a functional flow diagram of an automatic sulfur hexafluoride recovery processing apparatus according to the present invention;
FIG. 2 is a schematic structural diagram of a piston type vacuum coaxial valve which takes vacuum as a power air source and is used for the automatic sulfur hexafluoride recovery and treatment device; the reference numbers in fig. 2 are as follows: the valve comprises an electromagnetic valve part A, a coaxial valve part B, a two-position three-way electromagnetic valve coil 201, a two-position three-way electromagnetic valve spring 202, a two-position three-way electromagnetic valve spool 203, a left pressing block 204, a left sealing block 205, an inner sealing ring 206 of the sealing block, an outer sealing ring 207 of the sealing block, a pressing block sealing ring 208, a spool spring 209, a cylinder barrel 210, a piston type spool 211, a piston sealing ring 212, a sealing gasket 213, a right sealing block 216, a sealing valve seat 217, a connecting bolt 218 and a right pressing block 219.
FIG. 3 is a schematic sectional view of an oil-free gas compressor of the automatic sulfur hexafluoride recovery and treatment apparatus according to the present invention;
FIG. 4 is a schematic sectional view showing an oil-free gas compressor of the automatic sulfur hexafluoride recovery and treatment apparatus of the present invention;
FIG. 5 is a flow chart illustrating the operation principle of the compression process of the oil-free gas compressor of the present invention;
the reference numbers in fig. 3 and 4 are as follows: the eccentric shaft box 301, the transition flange 302, the eccentric shaft box cover plate 303, the low-pressure cylinder 304, the high-pressure cylinder 305, the first spacer ring 306, the inertia balance wheel 307, the eccentric wheel 308, the transmission shaft 309, the support shaft 310, the spacer fixing clamp 311, the second spacer ring 312, the high-pressure cylinder cover bolt 313, the low-pressure cylinder cover bolt 314, the fastening bolt 315, the connecting rod 316, the high-pressure piston 317, the balance plate 318, the inner magnetic circuit 320, the sealing bearing 321, the cover plate bolt 325, the cylindrical pin 328, the flange sealing washer 334, the flat key 336, the fastening screw 337, the ventilation joint 338, the cylinder sealing washer 340, the high-pressure valve plate 342, the high-pressure cylinder cover 345, the inlet and outlet joint 350, the temperature sensor joint 352, the low-pressure valve plate 354, the low-pressure cylinder cover 357, the spacer sealing washer 359, the spacer 360, the outer magnetic circuit 361, the motor connecting cylinder 362 and the hole stop 364.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
An automatic sulfur hexafluoride recovery and treatment device comprises a gas storage device, a filtering system, a compression system, a pipeline system and an electric control system, wherein the gas storage device, the filtering system, the compression system, the pipeline system and the electric control system are arranged on a supporting device; wherein the filtering system comprises a particle filter and a moisture filter; the compression system comprises a compressor and a recovery pump; the pipeline system comprises pipelines connected among the devices and electromagnetic control valves on the pipelines; the electric control system comprises a sensor, an electric control element and an instrument display device; the connection relationship and the working principle of the components are shown in figure 1. The compression system adopts oil-free lubrication without lubricating oil.
The gas storage device is a storage tank or a gas cylinder and is used for storing the gas which is recovered and subjected to particle filtration, moisture filtration and decomposition product filtration in a liquid state. The gas storage device is fixed on the support frame. The support frame is of a steel frame structure and is provided with a forklift hole convenient to assemble and disassemble, and the support frame is also provided with a steering wheel and a fixed wheel which can be braked.
In addition, the sulfur hexafluoride automatic recovery processing device also comprises a vacuum pumping system, wherein the vacuum pumping system comprises a vacuum pump, a vacuum power source coaxial control valve, a vacuum pressure sensor and a vacuum breaking ball valve which are sequentially connected through a pipeline; the vacuum power source coaxial control valve can effectively prevent lubricating grease from flowing back to enter the recovery device and the vacuumized product, so that the vacuum system does not have the phenomenon of oil backflow of a vacuum pump.
The sulfur hexafluoride automatic recovery processing device also comprises an air charging system, wherein the air charging system comprises an external heating type evaporator, a pressure reducer, a one-way valve, a moisture particle filter, a control valve and a pressure sensor; the external heating evaporator is used for heating and gasifying liquid SF6 during inflation.
The sulfur hexafluoride automatic recovery processing device provided by the invention adopts PLC program automatic control in the whole operation process: inputting a recovery final pressure value on a touch screen or an industrial control computer to realize automatic recovery shutdown; setting inflation pressure on a touch screen or an industrial control computer to carry out automatic constant-pressure inflation; the vacuum value is set on a touch screen or an industrial computer to realize the automatic stop of the vacuumizing and the time delay to ensure that the vacuum is more thorough.
The invention provides an automatic recovery processing device of sulfur hexafluoride, which comprises the following recovery processes of:
1) Enabling sulfur hexafluoride waste gas to be recovered to pass through a particle filter to remove specific pollutants;
2) There are two cases: when the pressure of the waste gas is higher than the atmospheric pressure value, the waste gas firstly passes through the pressure reducer and then enters the compressor;
3) The compressed gas passes through a moisture particle filtering device and then enters a gas storage device.
In the technical scheme of the invention, the recovery pump runs in a dry mode and operates absolutely without oil, and is protected by a pressure switch, a pressure detector and an electromagnetic valve so as to avoid unallowable working conditions. The recovery pump may pump the gas chamber to less than pa1 mbar (absolute). The recovery pump will automatically turn on at a pressure of about Pe =0.1-0.2 bar. The pressure at the output of the recovery pump is controlled by a pressure sensor, and the regulating valve at the input can avoid the overhigh output pressure caused by the blockage of the inlet valve. The output pressure can be adjusted to approximately pa1000-1050mbar by a regulating valve on the output end of the recovery pump to avoid that the compressor on the recovery vehicle is sucked in at too low negative pressure to affect the operation of the compressor.
The electromagnetic control valve and the pipeline are used for controlling the gas flow direction. The vacuum pump only operates on air, and can vacuumize the air chamber and maintain the equipment.
The external heat evaporator is used for heating and gasifying the stored SF6 in the liquid state, so that the purpose of air inflation is achieved. When the liquid sulfur hexafluoride in the gas cylinder is filled into the high-pressure equipment, the sulfur hexafluoride is changed from the liquid state to the gas state, a large amount of heat needs to be absorbed, if no external heat source continuously supplements heat to the liquid gas, most residual sulfur hexafluoride in the gas cylinder cannot be discharged, and the gas is wasted. In this embodiment, the heating mode is external heating formula, and liquid SF6 gas in the gas cylinder flows in the evaporimeter that has the multiunit heating circle and carries out the uniform heating, adopts pressure automatic control and demonstration gas pressure simultaneously, makes gas constant at a certain set pressure, prevents that gas pressurization from excessively causing evaporimeter trouble etc..
The filtering system comprises a particle filter and a moisture filter, firstly filters particles in the gas, then filters moisture and decomposition products in the gas, and then stores the filtered gas in a liquid state. The effect of purifying and regenerating SF6 gas is achieved through two-step filtration.
The electric control system comprises a touch screen, a PLC and other electric control component devices, function selection operation and set data input are carried out on the touch screen, a control program is compiled in the PLC, and the purpose of setting functions of the equipment is achieved. The operation control of all the parts and equipment is achieved through electrical components.
After the compressor is magnetically coupled by the non-oil lubrication leakage-free non-metal isolation sleeve, the recovered gas does not contain oil, the regeneration treatment of the gas is very simple and easy, the equipment does not leak, and the influence on the environment is reduced to the minimum. Meanwhile, even if the rotating part of the compressor is abraded after the compressor runs for a long time to cause a fault, the magnetic coupling power transmission slips without causing further damage to parts of the compressor head under the condition that the motor does not stop working, so that the maintenance is simple and easy, the cost is reduced, and the maintenance is faster.
Example 2
As shown in fig. 1, an automatic sulfur hexafluoride recovery and treatment device includes the following components: the device comprises a support frame, a compressor, a recovery pump, a vacuum power source coaxial valve, an external heat evaporator, a gas storage tank, a dust filter, a dry filter, a plurality of electromagnetic valves, pipelines for connecting all the components, a touch screen, a PLC and other electric control components. The structure and function of each component are the same as those of embodiment 1. The sulfur hexafluoride automatic recovery processing device comprises an automatic vacuum pumping system, an inflation system and a recovery compression system.
For the vacuum-pumping system, referring to fig. 1, the working principle and the working route are as follows: before operation, a pipeline with a self-sealing joint is connected into 11 ports of the equipment, and the other end of the pipeline is connected into the equipment needing vacuumizing. Automatic vacuumizing is started through a touch screen, and the numerical value of vacuumizing and vacuumizing delay time are set. When the product vacuumizing parameters required by differential pressure are set, the delay time is 0. The vacuum rebound value can be displayed on the touch screen, the value is used for detecting the leakage of the product, when the function indication reaches a set value, the equipment can close the electromagnetic valve to isolate the product from the vacuum pump, and the vacuum in the product can rebound rapidly within a few seconds. 3 detections are fixed in the PLC device program, if the 3 detections still exceed the set value, the pumped product is considered to have leakage, and the pipeline and the product need to be checked. Vacuum rebound values are generally required to be calculated on an annual leak rate basis.
In the technical scheme of the invention, the vacuum pump is started with pressure protection, if the pressure in the pumped product or the pipeline is higher than 0.2bar, the vacuum pump cannot be started, and the piston type vacuum coaxial valve taking vacuum as a power air source in front of the pump cannot be opened and can be started only after the pressure is removed. When the vacuum degree reaches the set parameters, the equipment automatically stops, and the vacuum value can be observed on the touch screen.
As shown in fig. 1, the direction of the automatic vacuum gas flow is: from the port of the pipeline 11 to a vacuum pipeline, a vacuum pressure sensor, a control valve V1 and finally to the atmosphere through a vacuum pump.
For the automatic compression recovery system, referring to fig. 1, the working principle and the working route are as follows: before operation, the pipeline of the self-sealing joint is connected into a port 11 of the equipment, the other end of the self-sealing joint is connected into a product to be recovered, an empty special gas storage steel cylinder or a storage tank is connected into a port 21, the steel cylinder is preferably placed on the equipment with a weighing device, the weight is convenient to observe, the storage allowable amount is not exceeded, and the weighing device is recommended to be carried for the gas storage tank. Setting a final pressure value to be recovered and recovery delay time through a touch screen: a pressure below 0 gauge pressure, hereinafter referred to as absolute pressure, in units of mbar of 0-1 bar absolute, with an input range of 1-999 mbar; pressures above 0 gauge, referred to hereinafter as relative pressures, with relative pressures in the range of 0 to 9bar being given in bar and input ranges in the range of 0.01 to 9.99bar. The recovery delay time is to solve the problem that the actual input value may rebound to exceed the set value due to a small amount of return air of the compressor after the recovery is stopped, so that the recovery delay time is allowed to be a certain time for reaching the set value more accurately, and the proposal of the differential pressure setting requirement is set to be 0.
In the technical scheme of the invention, the gas recovery process comprises the following steps: from 11 ports to the particle filter, pipeline, sensor, V6 valve (when under atmospheric pressure, V6 is closed, the gas passes through V8, recovery pump, V7 valve, compressor, V2 valve is the same as above atmospheric pressure), pressure stabilizer, compressor, V2 valve, moisture particle filter, V4 valve to 21 ports, and enters into the gas storage tank or bottle.
For the automatic inflation system, referring to fig. 1, the working principle and the working route are as follows: before operation, a pipeline with a self-sealing joint is connected to 11 ports of the equipment, the other end of the pipeline is connected to a product needing vacuumizing, and a special gas storage steel cylinder or a storage tank with SF6 is connected to 21 ports.
And starting an inflation button through the touch screen to set inflation pressure. The inflation pressure is relative pressure in bar, and pressure above 0 gauge is directly input, such as 0.5bar. If the inflation pressure is below 0 gauge, "-" is entered, as when an absolute inflation pressure of 400mbar is required, the inputs need to be calculated: an absolute 400mbar corresponds to a relative pressure of-600 mbar, and so on, conversion of a unit to bar (kg) is required.
And when the inflation pressure value is set and the vehicle is returned, the automatic inflation upper and lower limit values are automatically generated. Generally, the upper limit proportion number of automatic inflation is the maximum upper limit threshold of a set value, the lower limit proportion number is the minimum lower limit threshold of the set value, the actual inflation pressure is in the upper limit and the lower limit, the program considers that the inflation meets the requirements, at the moment, the V9 valve is in a closed state on the flow chart, the color of the pipeline after the valve is recovered, meanwhile, the pressure indication is in the set range, and the inflation is considered to be finished. The program can be exited or the tubing can be moved directly to the next product to continue the inflation without changing the settings as long as the parameters are the same.
The inflation process can be automatically set by a PLC program or can be completed by manual operation. The inflation process is related to liquid gas, and gas is inflated only after the evaporation and gasification reach a certain pressure. If the automatic inflation mode is selected, when the stored gas quantity is insufficient, the inflation is slow and the pressure cannot be inflated, at the moment, the compressor can be started through manual operation, and the effect of air suction and pressurization is achieved.
In the technical scheme of the invention, the inflation process and the relation of related parts are as follows: the liquid SF6 goes through 21 ports to V5 valve, evaporator (heating and gasifying), check valve, moisture particle filter, V3 valve, pressure reducer, V9 valve, pressure sensor and 11 ports to the aerated product.
According to the invention, through the PLC and the pressure sensor, the gas recovery process is not stopped, the valve is controlled after the pressure measured by the electromagnetic valve to be detected by the sensor is temporarily closed and compared with the set pressure, multiple times of automatic measurement and comparison are carried out within the designed upper and lower limit ranges through the program design, and the recovery device is automatically stopped until the set pressure value, so that the gas recovery control failure caused by inaccurate operation of workers is avoided when the gas is recovered.
The automatic recovery processing device has a constant-pressure inflation function, and adopts a PLC program to set inflation pressure for automatic constant-pressure inflation, so that even if the inflation pressure values of products are different in requirement, the equipment can perform constant-pressure inflation according to a flow programmed by the program as long as the required inflation value is set.
The invention adopts PLC program to set vacuum value, automatically stops the machine by vacuum pumping and sets time delay to make the vacuum more thorough. The device measures the vacuum degree value by automatically opening and closing the valve through a pre-programmed program under the condition of no shutdown, and the function is automatically stopped until the required vacuum degree is met.
Example 3
An automatic recovery processing device of sulfur hexafluoride comprises the following components: a supporting frame, a compressor, a recovery pump, a vacuum pump,To be provided withThe vacuum energy-saving device comprises a piston type vacuum coaxial valve taking vacuum as a power air source, an external heat evaporator, an air storage tank, a dust filter, a dry filter, a plurality of electromagnetic valves, pipelines for connecting all the parts, a touch screen, a PLC and other electric control components. The structure and function of each component are the same as those of embodiment 1. The sulfur hexafluoride automatic recovery processing device comprises an automatic vacuum-pumping system, an air-charging system and a recovery systemA compression system.
In the technical scheme of this embodiment, the vacuum pumping system is provided with a piston type vacuum coaxial valve which takes vacuum as a power air source in front of an inlet of a vacuum pump, is used for protecting the vacuum pump from being damaged by positive pressure, and is used for isolation control of a detection vacuum pump and a product air chamber.
As shown in fig. 2, the piston type vacuum coaxial valve using vacuum as a power air source adopted by the sulfur hexafluoride automatic recovery processing device of the present invention includes an electromagnetic valve portion a and a coaxial valve portion B: the solenoid valve portion includes a solenoid control device; the coaxial valve part takes vacuum as a power source and comprises a piston type valve core 211, a cylinder barrel 210, a left pressing block 204, a right pressing block 219, a left sealing block 205, a right sealing block 216, a sealing ring and a sealing valve seat 217. The piston type valve core 211 is cylindrical, is sleeved in the cylinder barrel 210 and can realize reciprocating movement; two ends of the cylinder barrel 210 are provided with a left sealing block 205 and a right sealing block 216 respectively, the left sealing block and the right sealing block are respectively used for sealing a sleeving gap between the piston type valve core and the cylinder barrel; the outer end of the sealing block is also provided with a pressing block, the left pressing block and the right pressing block are respectively a left pressing block 204 and a right pressing block 219, and the pressing blocks are used for pressing the sealing block; a sealing valve seat 217 is also arranged at the outlet end of the piston type valve core 211 and is used for sealing the port of the piston type valve core 211; the electromagnetic control device is communicated with the side wall of the cylinder barrel 210 through one end of the pipeline, and the other end of the electromagnetic control device is communicated with the pressing block outside the sealing valve seat.
The outer wall of the piston type valve core 211 is provided with an annular step, an annular groove is arranged on the step, a piston sealing ring 212 is nested in the annular groove, and the piston sealing ring 212 is in sealing contact with the inner wall of the cylinder barrel 210; the side wall of the inlet end of the piston type valve core 211 is sleeved with a valve core spring 209, one end of the valve core spring 209 abuts against the section of the left sealing block 204, and the other end of the valve core spring 209 abuts against the side surface of the annular step of the piston type valve core 211.
The side wall of the cylinder barrel 210 is provided with two vent holes which are respectively communicated with the spaces at two sides of the annular step of the piston type valve core 211, wherein the vent hole at the inlet end is communicated with an electromagnetic control device through a pipeline, and the vent hole at the outlet end is communicated with the atmosphere.
The sealing ring is arranged on the mutual contact surface among all the parts and mainly distributed on a plurality of contact surfaces: the contact surface between the outer wall of the piston type valve core 211 and the inner wall of the sealing block, such as the inner sealing ring 206 of the sealing block in the figure, is arranged at the left and the right; the contact surface between the outer wall of the sealing block and the inner wall of the pressing block is one on the left and the right, such as the outer sealing ring 207 of the sealing block in the figure; the contact surfaces between the outer wall of the cylinder barrel 210 and the inner wall of the pressing block, such as the pressing block sealing rings 208 in the figure, are arranged on the left and the right. The sealing mode of the sealing ring adopts a mode of combining the annular groove and the annular sealing ring.
The sealing blocks are respectively arranged on the left and the right, the sealing blocks are slightly different from each other, the sealing blocks are in a round cake shape with a hole in the middle, the outer wall of the round cake is provided with an annular groove, an elastic sealing ring is nested in the groove, and the elastic sealing ring is elastically contacted and sealed with the inner wall of the pressing block; the inner wall of the middle hole is provided with an annular groove, an elastic sealing ring is nested in the groove, the sealing blocks are sleeved on the outer walls of the two ends of the piston type valve core, and the elastic sealing ring is elastically contacted and sealed with the outer wall of the piston type valve core; the section of the sealing block is abutted against the port of the cylinder barrel; the edge of the sealing block at the outlet end is also provided with a flange extending outwards.
The pressing block is positioned on the outer side of the sealing block, a cylindrical fluid channel is arranged inside the pressing block, and steps are arranged inside the pressing block to form 2-3 sections of cylindrical channels with different diameters; the cylinder barrel 210, the left sealing block 205 and the right sealing block 216 are all sleeved in the barrel diameter of the pressing block; the innermost step of the left pressing block 204 at the inlet end is propped against the port of the piston type valve core 211; the side wall of the right pressing block 219 at the outlet end is provided with an air hole which is communicated with an electromagnetic control device through a pipeline; the left and right pressing blocks are connected and fastened through bolts 218.
The sealing valve seat 217 is in a round cake shape, the edge of the cross section of the sealing valve seat is abutted against the edge folding end face of the sealing block, a round elastic sealing gasket 213 is arranged at the center of the round cake-shaped cross section, the diameter of the elastic sealing gasket 213 is larger than or equal to that of the piston type valve core 211, and the elastic sealing gasket and the outlet end of the piston type valve core 211 form elastic sealing; the outlet end of the piston type valve core 211 is in an inner cone shape, a knife edge is formed at the edge of the outer wall of the port to form an annular sealing knife, and the annular sealing knife is propped against an elastic sealing gasket in the center of the sealing valve seat to form elastic sealing.
The electromagnetic control device includes: the two-position three-way electromagnetic valve comprises a two-position three-way electromagnetic valve, an electromagnetic valve spring and an electromagnetic valve core; one port of the two-position three-way electromagnetic valve is communicated with the atmosphere, one port of the two-position three-way electromagnetic valve is communicated with the vent hole at the inlet end of the cylinder barrel, and the other port of the two-position three-way electromagnetic valve is communicated with the vent hole of the pressing block at the outlet end.
When the coaxial valve is opened, a vent hole at the outlet end of the cylinder barrel is communicated with a pressing block at the outlet end through a pipeline and a two-position three-way electromagnetic valve; when the coaxial valve is closed, the air vent at the inlet end of the cylinder barrel is communicated with the atmosphere through a pipeline and the two-position three-way electromagnetic valve.
The gas or other media has bidirectional flow control, and the fluid in the inlet end pipeline is positive pressure or vacuum negative pressure; when the valve is closed, it can bear vacuum and positive pressure without leakage.
Fig. 2 is a schematic diagram of the coaxial valve in the open state, the principle of which is: when a right pressing block 219 in the figure is connected with a vacuum pump through a pipeline and the vacuum pump is started, vacuum negative pressure is generated in a right pressing block cavity, the two-position three-way electromagnetic valve is in an open state, an a port of the two-position three-way electromagnetic valve is communicated with a p port, so that the vacuum negative pressure in the right pressing block cavity is transmitted to a cavity with a valve core spring 209 on the left side of a piston type valve core 211 through the two-position three-way electromagnetic valve, because the right side of the piston type valve core is always in an atmospheric pressure state, and the left side cavity generates differential pressure on two sides under the vacuum action, when the force generated by the differential pressure is larger than the spring force, the piston type valve core 211 moves leftwards, so that a knife edge of the piston type valve core 211 is separated from a rubber sealing gasket 213 of a sealing valve seat 217, when the piston type valve core moves leftwards to an inner side step limit position of a left pressing block 204, the piston type valve core stops moving, so that a coaxial valve is in an open state, under the action of right vacuum, left side air flow to the vacuum pump through a round hole in the middle of the piston type valve core, and a pipeline or other cavities connected with the left pressing block 204 form vacuum.
When the two-position three-way electromagnetic valve is closed, the two-position three-way electromagnetic valve a is communicated with r, and a is not communicated with p, so that the cavity on the left side of the piston type valve core is communicated with the atmosphere and becomes the atmospheric pressure. Which again recovers the state of figure 1.
When the coaxial valve is in a closed state, the right pressure block 219 in fig. 2 is connected with the vacuum pump through a pipeline and the vacuum pump is started, vacuum negative pressure is generated in the cavity of the right pressure block 219, and meanwhile when the two-position three-way electromagnetic valve is in a closed state, the vacuum negative pressure cannot be transmitted to the cavity with the 209 spring on the left side of the piston type valve core 211. At the moment, the two-position three-way electromagnetic valve is closed, the port a is communicated with the port r, and the port a is not communicated with the port p, so that the cavity on the left side of the piston type valve core 211 is communicated with the atmosphere and becomes the atmospheric pressure, and then the sealing knife edge on the right side of the piston type valve core 211 is pressed with the rubber sealing gasket 213 of the sealing valve seat 217 through the spring force of the valve core spring 209, so that the coaxial valve is sealed in a closed state.
The piston type vacuum coaxial valve which takes vacuum as a power air source is adopted, and an external power air source and a power air source are not needed. The valve has the special advantage that once the vacuum pump stops, no matter the vacuum pump stops operating intentionally or not, the vacuum power source is lost, the valve is automatically closed immediately, oil is prevented from entering processed products due to vacuum in the stop state, and the products are protected from being polluted.
In the technical scheme of the invention, the vacuum function can not only vacuumize the equipment per se but also vacuumize the recovered product. The invention adopts the piston type vacuum coaxial valve which takes vacuum as a power air source to be used in front of the vacuum pump, so that the vacuum pump is protected when the pipeline is in positive pressure, and when the inlet of the pump is in positive pressure, the valve is automatically closed and cannot be opened, thereby protecting the safety of the pump. When the inlet is in a state without positive pressure, the vacuum pump is started to provide vacuum power for the valve, and the valve is automatically opened at the moment to connect the processed product with a vacuum pipeline of the equipment to complete the vacuum function.
According to the technical scheme, vacuum is used as a power source, namely, a high-power electromagnetic coil is not needed to control the coaxial valve to be opened and closed, and whether vacuum negative pressure is transmitted or not can be controlled by using a low-power two-position three-way electromagnetic valve, so that the coaxial valve is opened and closed, the power consumption is low, and the operation is convenient and rapid. Moreover, a balanced structure design is adopted between the inlet and the outlet, and a pipeline or other inner cavities connected with the inlet end can be positive pressure or vacuum negative pressure.
Example 4
An automatic recovery processing device of sulfur hexafluoride comprises the following components: the device comprises a support frame, a compressor, a recovery pump, a vacuum power source coaxial valve, an external heat evaporator, a gas storage tank, a dust filter, a dry filter, a plurality of electromagnetic valves, pipelines for connecting all the components, a touch screen, a PLC and other electric control components. The structure and function of each component are the same as those of embodiment 1. The sulfur hexafluoride automatic recovery processing device comprises an automatic vacuum pumping system, an inflation system and a recovery compression system.
In the technical scheme of the embodiment, the compressor adopts an oil-free lubrication leakage-free nonmetal spacer sleeve magnetic coupling power transmission compressor.
As shown in fig. 3 and 4, the compressor used in the automatic sulfur fluoride recovery processing device of the present invention is an inverted Y-type oil-free gas compressor, which comprises an eccentric axle box 301, a low pressure cylinder 304, a low pressure piston 365, a high pressure cylinder 305, a high pressure piston 317, a connecting rod 316, a transmission shaft 309, a support shaft 310, an inertia balance wheel 307, an eccentric shaft 308, and a magnetic circuit coupling device; wherein: one end of the eccentric axle box 301 is provided with an eccentric axle box cover plate 303, the eccentric axle box cover plate 303 is fixedly connected with the eccentric axle box through a cover plate bolt 325, and the cover plate bolt 325 is further sleeved with a check washer. The high-pressure cylinders 305 are distributed on the upper part of the eccentric axle box, the low-pressure cylinders 304 are distributed on two sides of the lower part of the eccentric axle box, the high-pressure cylinders and the low-pressure cylinders are distributed in an inverted Y-shaped structure, and the three cylinders are mutually staggered at an included angle of 120 degrees and are not arranged on the same plane. The low pressure piston 365 and the high pressure piston 317 are connected to the eccentric 307 by a connecting rod 316, and the three pistons are also offset from each other by 120 degrees. The eccentric shaft 308 is located between the support shaft 310 and the transmission shaft 309, and both ends are connected to them.
The magnetic coupling device includes: inner magnetic path 320, isolation sleeve 360, outer magnetic path 361. The inner magnetic path 320 is a cylindrical structure, the caliber of two ends is different, one end with smaller caliber is installed on the transmission shaft 309, corresponding grooves are arranged on the inner diameter and the transmission shaft 309, a flat key 336 is installed in each groove to facilitate disassembly and connection and transmit torque, a plurality of corresponding through holes are also arranged on the outer wall of the end with smaller caliber, and fastening screws 337 are installed in the through holes to fasten the connection of the inner magnetic path 320 and the transmission shaft 309. The isolation sleeve 360 is made of non-metal materials, the isolation sleeve 360 is of a basin-shaped structure, a folded edge extending outwards is arranged at the edge of the caliber, and an isolation sleeve fixing clamp 311 is arranged at the folded edge and used for fixing the isolation sleeve 360; the port of the isolation sleeve 360 is sealed with the transition flange 302 by an isolation sleeve sealing washer 359, and a plurality of fastening bolts are further arranged at the flanged position to fixedly connect the isolation sleeve 360 and the transition flange 302.
The magnetic circuit coupling device also has a motor connector 362 on the outside.
In the present embodiment, in order to ensure oil-free performance in the compressor, no lubricating oil is added to the eccentric shaft housing, and gas is used as a lubricating medium for the rotary bearing in the eccentric shaft housing.
The compression process adopts two-stage compression, two low-pressure cylinders carry out one-stage compression on gas, and a high-pressure cylinder further carries out two-stage compression on the gas; the working principle is shown in fig. 5: the inlet of the low-pressure cylinder is communicated with the eccentric axle box, and the outlet of the low-pressure cylinder is communicated with the inlet of the high-pressure cylinder through a pipeline. The gas entering the low-pressure cylinder is compressed in the eccentric shaft box and then enters the high-pressure cylinder through the outlet of the low-pressure cylinder through an outer pipeline, so that primary compression is completed. The inner cavity of the high-pressure cylinder is divided into two sections with different diameters, the diameter of one section of the inner cavity close to the piston is larger than that of the other section of the inner cavity, and gas after primary compression enters the high-pressure cylinder firstly and then is subjected to secondary compression and then is introduced into external equipment.
The upper section and the lower section of the high-pressure cylinder are sealed through circular gaskets, a high-pressure valve plate 342 and an elastic gasket are arranged between the high-pressure cylinder cover 345 and the high-pressure cylinder 305, and the high-pressure cylinder cover 345 and the high-pressure cylinder 305 are fixedly connected through high-pressure cylinder cover bolts 313.
The low pressure cylinder 304 is not segmented and is a single segment. The low-pressure cylinder cover 357 and the low-pressure cylinder 304 are provided with a low-pressure valve sheet 354 and an elastic gasket, and the low-pressure cylinder cover 357 and the low-pressure cylinder 304 are fixedly connected through a low-pressure cylinder cover bolt 314. The outer walls of the low pressure cylinder 304 and the high pressure cylinder 305 also have fins.
In the eccentric axle box 301, two ends of the eccentric axle 308 are provided with two inertia balance wheels 307, the outer side surface of the inertia eccentric wheel 307 is provided with a circular cavity, the circular cavity of the inertia eccentric wheel 307 at the left end is nested with a support shaft 310, and the circular cavity of the inertia eccentric wheel 307 at the right end is nested with a transmission shaft 309; the low-pressure cylinder 304 and the high-pressure cylinder 305 are positioned between two inertia balance wheels 307, the eccentric shaft 308 is positioned to deviate from the center of the inertia balance wheels, a balance sheet 318 is further installed on one side of the inertia balance wheels 307 far away from the eccentric shaft 8, and one of the two inertia balance wheels 307 is fixedly connected with the inertia balance wheel 307 through a countersunk bolt. Between the eccentric shaft 308 and the inertia balance wheel 307, there are spacers, one on each side, a first spacer 306 and a second spacer 312, wherein the first spacer 306 is close to the support shaft 310, and the second spacer 312 is close to the drive shaft 309.
The two end surfaces of the eccentric shaft 308 and the inertia balance wheel 307, the end surface of the support shaft 310 and the inertia balance wheel 307, and the end surface of the transmission shaft 309 and the inertia balance wheel 307 are fixed through cylindrical pins 328; the end face of the spacer 360 is also fixedly connected to the transition flange 302 by the cylindrical pin 328. The end face center of the support shaft 310 is further provided with a fastening bolt 315 and a lock washer for connecting the support shaft 310 and the eccentric shaft 308. The bottom of the circular cavity of the inertia balance wheel 307 is fixedly connected with the eccentric shaft through a fastening bolt and a check washer.
Sealing bearings 321 are arranged between the eccentric shaft box cover plate 303 and the supporting shaft 310 and between the sealing flange 302 and the transmission shaft 309; each piston connecting rod 316 is connected to the eccentric shaft 308 via a seal bearing 321. The sealed bearing 321 may be a deep groove ball bearing.
The high-pressure cylinder and the low-pressure cylinder are provided with inlet and outlet joints 350, each cylinder is provided with two cylinders, the left cylinder and the right cylinder are respectively provided with one cylinder, and the total number of the three cylinders is 6. The high pressure cylinder also has a breather connector 338 and a temperature sensor connector 352 thereon.
The oil-free gas compressor in the technical scheme of the invention adopts direct-coupled magnetic coupling transmission, no lubricating oil is added in the cylinder and the eccentric axle box, the eccentric axle box and all high/low pressure cylinders are effectively and completely isolated from the outside atmosphere through the isolating sleeve, full sealing is really realized, and the problem of dynamic seal leakage of the transmission shaft of the eccentric axle box is solved. Under the sealing action of the nonmetal isolation sleeve, even under the negative pressure condition, outside gas cannot enter the compressor, so that the purity of the gas to be compressed is effectively protected.
In the oil-free gas compressor in the technical scheme, the cylinders are of an inverted Y-shaped structure, and the three cylinders are staggered at an included angle of 120 degrees and are not arranged on the same plane, so that the resultant force of three rows of pistons is on the same eccentric shaft, and the balance force is completely balanced, therefore, the operation is stable, and the silencing effect is good; and the compressor can take higher rotating speed, so that the adoption of direct-coupled magnetic coupling is possible, and the efficiency of the compressor is greatly improved.
The oil-free gas compressor in the technical scheme of the invention adopts an eccentric shaft structure, and does not need to have turns like an eccentric shaft, so that deep groove ball sealing bearings are adopted for transmission among the main journal, the eccentric shaft and the connecting rod, the assembly is simple and convenient, and the efficiency is high. And the three pistons are staggered by 120-degree included angles, so that mechanical vibration generated by the operation inflection point of the reciprocating motion machine is greatly improved.
According to the technical scheme, the external heating type evaporator is used for heating and gasifying the liquid SF6 during inflation, so that the heater is heated more uniformly, the local high-temperature condition is reduced, the rapid increase of the pressure of the heater due to rapid volume expansion is avoided, the heating in the whole process is smooth and stable, and the heating is safe and reliable. Meanwhile, due to the surrounding heating, the maintenance is very convenient, the pipeline and related sealing do not need to be dismantled, and the device is economical and applicable.
While the foregoing description shows and describes the preferred embodiments of the present invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (4)
1. The utility model provides an automatic recovery processing device of sulfur hexafluoride which characterized in that: comprises a gas storage device, a filtering system, a compression system, a pipeline system and an electric control system which are arranged on a supporting device; the filtering system comprises a particle filter and a moisture filter; the compression system comprises a compressor and a recovery pump; the pipeline system comprises pipelines connected among the devices and control valves on the pipelines; the electrical control system comprises a sensor, an electrical control element and an instrument display device; the compression system adopts oil-free lubrication without lubricating oil; the vacuum pump is characterized by further comprising a vacuum pumping system, wherein the vacuum pumping system comprises a vacuum pump, a control valve, a vacuum pressure sensor and a vacuum breaking ball valve which are sequentially connected through a pipeline; a piston type vacuum coaxial valve which takes vacuum as a power air source is used in front of the vacuum pump, so that oil backflow is automatically prevented from entering a pipeline system when the vacuum pump is stopped; the vacuum pumping system is provided with a piston type vacuum coaxial valve which is used for taking vacuum as a power air source and is arranged on a pipeline at the front end of the vacuum pump, and is used for protecting the vacuum pump from being damaged by positive pressure; the piston type vacuum coaxial valve taking vacuum as a power air source comprises a coaxial valve part and an electromagnetic valve part, wherein the coaxial valve part takes vacuum as a power source and comprises a piston type valve core, a cylinder barrel, a pressing block, a sealing ring and a sealing valve seat, and the electromagnetic valve part comprises an electromagnetic control device; the piston type valve core is cylindrical, is sleeved in the cylinder barrel and can move back and forth; the side wall of the cylinder barrel is provided with a vent hole, and two ends of the cylinder barrel are provided with sealing blocks for sealing a sleeving gap between the piston type valve core and the cylinder barrel; the outer end of the sealing block is provided with a pressing block for pressing the sealing block; the outlet end of the piston type valve core is also provided with a sealing valve seat for sealing the port of the piston type valve core; the electromagnetic control device is communicated with the side wall of the cylinder barrel through one end of a pipeline, and the other end of the electromagnetic control device is communicated with a pressing block outside the sealing valve seat; the sealing ring is positioned on the mutual contact surface among all the parts; the device also comprises an air charging system, wherein the air charging system comprises an external heating type evaporator, a pressure reducer, a one-way valve, a moisture particle filter, a control valve and a pressure sensor; the external heating type evaporator is used for heating and gasifying liquid SF6 during air inflation; the compression system comprises a compressor which is in magnetic coupling power transmission and is lubricated without oil and sealed and isolated by a nonmetal isolation sleeve; the compressor comprises an eccentric axle box, a high-pressure cylinder, a low-pressure cylinder, a piston, a transmission shaft, an eccentric shaft, a bearing shaft and a magnetic coupling device; the magnetic coupling device adopts direct-coupled magnetic coupling transmission and comprises an inner magnetic circuit and an outer magnetic circuit, the eccentric axle box is in full-sealed isolation from the outside atmosphere through a non-metal isolation sleeve, and the inner magnetic circuit and the outer magnetic circuit are isolated by the non-metal isolation sleeve; the non-metal isolation sleeve is formed by taking nylon and glass fiber as main materials; the eccentric shaft box is not internally provided with lubricating oil; the compressor is provided with three cylinders which are staggered at an included angle of 120 degrees and are not arranged on the same plane; the eccentric shaft box is completely sealed and isolated from the outside atmosphere through a non-metal isolation sleeve, the inner magnetic circuit and the outer magnetic circuit are isolated by the non-metal isolation sleeve, and meanwhile, the gas in the eccentric shaft box and the inner magnetic part are completely isolated from the atmosphere, so that no leakage is realized; lubricating media are not added among the high-pressure cylinder, the low-pressure cylinder and the piston, the piston is made of self-lubricating non-metallic materials, and the non-metallic materials are made of polytetrafluoroethylene serving as a base body and added with carbon fibers and polyimide in a mixing mode.
2. The automatic sulfur hexafluoride recovery processing apparatus of claim 1, wherein: the whole operation process adopts PLC program automation control: inputting a recovery final pressure value on a control terminal to realize automatic recovery shutdown; setting inflation pressure on a control terminal to carry out automatic constant-pressure inflation; the vacuum value is set on the control terminal to realize the automatic stop of the vacuum pumping and the time delay is set to ensure that the vacuum is more thorough.
3. The automatic sulfur hexafluoride recovery processing apparatus of claim 1, wherein: the recovery process of the sulfur hexafluoride gas comprises the following steps:
1) Enabling sulfur hexafluoride waste gas to be recovered to pass through a particle filter to remove specific pollutants;
2) The method comprises the following two cases: when the pressure of the waste gas is higher than the atmospheric pressure value, the waste gas firstly passes through the pressure reducer and then enters the compressor;
3) The compressed gas passes through a moisture particle filtering device and then enters a gas storage device.
4. The automatic recovery processing device of sulfur hexafluoride as claimed in claim 1, wherein: the rotary bearing in the eccentric axle box adopts recovered gas as a heat dissipation medium; the compression process adopts two-stage compression, two low-pressure cylinders carry out one-stage compression on gas, and a high-pressure cylinder further carries out two-stage compression on the gas; the inlet of the low-pressure cylinder is communicated with the eccentric shaft box, and the outlet of the low-pressure cylinder is communicated with the inlet of the high-pressure cylinder through a pipeline.
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CN109323122B (en) * | 2018-10-15 | 2021-04-13 | 杭州博大净化设备有限公司 | Efficient nitrogen purification equipment and intermediate collection method thereof |
CN109915728B (en) * | 2018-12-24 | 2020-10-16 | 国网浙江龙游县供电有限公司 | SF (sulfur hexafluoride)6Full-automatic vacuum pumping and inflating trolley |
CN113353892A (en) * | 2021-05-28 | 2021-09-07 | 南通虹登机械设备有限公司 | Gas purification system for SF6 gas station and purification method thereof |
CN114188869B (en) * | 2021-11-23 | 2024-06-28 | 江苏跨境数据科技有限公司 | Portable network display equipment based on SF6 air supplement |
CN113996126B (en) * | 2021-11-29 | 2022-12-23 | 国网江苏省电力有限公司检修分公司 | SF 6 Recovery filtering and self-cleaning device and filtering method |
CN115493082B (en) * | 2022-09-15 | 2023-08-01 | 四川红华实业有限公司 | Electronic grade chlorine trifluoride feeding system and method, and receiving system and method |
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