CN116989499A - Carbon dioxide cooling system for thermal spraying - Google Patents
Carbon dioxide cooling system for thermal spraying Download PDFInfo
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- CN116989499A CN116989499A CN202310729453.7A CN202310729453A CN116989499A CN 116989499 A CN116989499 A CN 116989499A CN 202310729453 A CN202310729453 A CN 202310729453A CN 116989499 A CN116989499 A CN 116989499A
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- carbon dioxide
- liquid carbon
- cooling medium
- mixer
- cooling
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 456
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 228
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 228
- 238000001816 cooling Methods 0.000 title claims abstract description 67
- 238000007751 thermal spraying Methods 0.000 title claims abstract description 20
- 239000007788 liquid Substances 0.000 claims abstract description 171
- 239000002826 coolant Substances 0.000 claims abstract description 73
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 88
- 230000001105 regulatory effect Effects 0.000 claims description 46
- 229910052757 nitrogen Inorganic materials 0.000 claims description 41
- 230000001276 controlling effect Effects 0.000 claims description 14
- 238000012544 monitoring process Methods 0.000 claims description 12
- 238000004891 communication Methods 0.000 claims description 7
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 6
- 230000000694 effects Effects 0.000 description 16
- 239000007789 gas Substances 0.000 description 9
- 238000007710 freezing Methods 0.000 description 6
- 230000008014 freezing Effects 0.000 description 6
- 239000002699 waste material Substances 0.000 description 4
- 239000000112 cooling gas Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B19/00—Machines, plants or systems, using evaporation of a refrigerant but without recovery of the vapour
- F25B19/005—Machines, plants or systems, using evaporation of a refrigerant but without recovery of the vapour the refrigerant being a liquefied gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B19/00—Machines, plants or systems, using evaporation of a refrigerant but without recovery of the vapour
- F25B19/02—Machines, plants or systems, using evaporation of a refrigerant but without recovery of the vapour using fluid jet, e.g. of steam
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
Abstract
The invention discloses a carbon dioxide cooling system for thermal spraying, which comprises: the liquid carbon dioxide jar body and coolant mixer, the top of the liquid carbon dioxide jar body is equipped with jar body top export, and the bottom of the liquid carbon dioxide jar body is equipped with jar body below export and jar body below entry, and coolant mixer includes: the mixer comprises a mixer body, a first inlet, a second inlet and a mixer outlet, wherein the first inlet, the second inlet and the mixer outlet are arranged on the mixer body, and the mixer outlet is connected with a cooling medium using end through a cooling pipeline; the outlet below the tank body is communicated with the inlet below the tank body through a pipeline to form a liquid carbon dioxide loop, a low-temperature pump is arranged on the liquid carbon dioxide loop, a liquid carbon dioxide branch is led out of the liquid carbon dioxide loop, and the liquid carbon dioxide branch is connected with a first inlet of the cooling medium mixer; the outlet above the tank body is connected with the second inlet of the cooling medium mixer through a gaseous carbon dioxide pipeline.
Description
Technical Field
The invention relates to the technical field of cooling, in particular to a carbon dioxide cooling system.
Background
In the thermal spraying process of the workpiece, a higher temperature rising phenomenon is usually accompanied, the workpiece needs to be rapidly cooled in order to ensure various performances of the workpiece, in the prior art, compressed air or nitrogen is mostly used for purging the workpiece, but the cooling effect of the two gases is not satisfactory.
Liquid carbon dioxide is also an excellent cooling medium, but the liquid carbon dioxide stored in the carbon dioxide storage tank is concentrated below the tank body, and gaseous carbon dioxide is above the tank body. When liquid carbon dioxide circulates in a pipeline, if the pressure drops, the liquid carbon dioxide can be quickly changed into a solid state, so that the liquid carbon dioxide is frozen in the pipeline, the pipeline is blocked, and the required liquid carbon dioxide cannot be obtained when the liquid carbon dioxide is reused.
In addition, when the liquid carbon dioxide flows out from the lower part of the tank body under the drive of the cryopump and then returns to the lower part of the tank body, a flowing carbon dioxide loop is formed, so that the liquid carbon dioxide in the loop flows and cannot be frozen. However, due to the existence of the cryopump, the pressure in the tank body is increased as a slow booster pump, when the pressure reaches a certain degree, the safety valve of the pipe can jump, the gaseous carbon dioxide above the tank body is discharged, and the pressure in the tank body is reduced, so that waste is caused.
In addition, although the cooling effect of liquid carbon dioxide is very good, it is difficult to precisely control the cooling effect of the workpiece.
Temperature-adjustable CO as disclosed in Chinese patent application 202211487957.4 2 Self-cooling buffer tank device, this self-cooling buffer tank device includes: the device comprises a tank body, a liquid carbon dioxide storage tank communicated with an inlet of the tank body, a runner pipe communicated with an outlet of the tank body, a temperature controller for heating the tank body, and a heat dissipation unit connected between the outlet and the inlet of the tank body; the heat dissipation unit is used for reducing the temperature of carbon dioxide in the tank body.However, the self-cooling buffer tank device disclosed in this patent has the following drawbacks and disadvantages: (1) The problem of freezing of the liquid carbon dioxide under the condition of pressure rise cannot be solved, and the waste of the liquid carbon dioxide is extremely easy to cause; (2) And cannot accurately control the cooling effect.
Therefore, providing a carbon dioxide cooling system for thermal spraying with high cooling efficiency and precisely controllable cooling effect is an urgent problem to be solved in the industry.
Disclosure of Invention
Aiming at the defects of the prior art, one of the purposes of the invention is to provide a carbon dioxide cooling system for thermal spraying, which can effectively avoid the defect that liquid carbon dioxide is easy to freeze and realize the accurate control of cooling effect.
The invention provides a carbon dioxide cooling system for thermal spraying, comprising: the liquid carbon dioxide jar body, the top of the liquid carbon dioxide jar body is concentrated and is had liquid carbon dioxide, and the top of the liquid carbon dioxide jar body is equipped with jar body top export, and the bottom of the liquid carbon dioxide jar body is equipped with jar body below export and jar body below entry, its characterized in that still includes the coolant mixer, and the coolant mixer includes: the mixer comprises a mixer body, a first inlet, a second inlet and a mixer outlet, wherein the first inlet, the second inlet and the mixer outlet are arranged on the mixer body, and the mixer outlet is connected with a cooling medium using end through a cooling pipeline; the outlet below the tank body is communicated with the inlet below the tank body through a pipeline to form a liquid carbon dioxide loop, a low-temperature pump is arranged on the liquid carbon dioxide loop, a liquid carbon dioxide branch is led out of the liquid carbon dioxide loop, and the liquid carbon dioxide branch is connected with a first inlet of the cooling medium mixer; the outlet above the tank body is connected with the second inlet of the cooling medium mixer through a gaseous carbon dioxide pipeline.
The cryogenic pump is a pump working at low temperature, and is particularly provided with a certain pressurizing effect and is used for driving liquid carbon dioxide to flow.
Optionally, in the liquid carbon dioxide loop, an outlet switch valve, a cryogenic pump, a branch switch valve and an inlet switch valve are sequentially arranged on a pipeline from an outlet below the tank body to an inlet below the tank body, and a liquid carbon dioxide branch is led out between the pipeline of the cryogenic pump and the pipeline of the branch switch valve.
Optionally, the liquid nitrogen mixer further comprises a liquid nitrogen tank body, the mixer body of the cooling medium mixer is further provided with a third inlet, and an outlet of the liquid nitrogen tank body is connected with the third inlet of the cooling medium mixer through a nitrogen pipeline.
Optionally, in the gaseous carbon dioxide pipeline, a first pressure regulating valve, a first electronic pressure gauge and a first mass flowmeter are sequentially arranged between an outlet above the tank body and a second inlet of the cooling medium mixer, wherein the first pressure regulating valve is used for regulating the pressure of the output gaseous carbon dioxide in the liquid carbon dioxide tank body, the first electronic pressure gauge is used for monitoring the pressure of the gaseous carbon dioxide in the gaseous carbon dioxide pipeline in real time, and the first mass flowmeter is used for controlling the flow of the gaseous carbon dioxide entering the cooling medium mixer.
Optionally, in the nitrogen pipeline, a second pressure regulating valve, a second electronic pressure gauge and a second mass flowmeter are sequentially arranged between an outlet of the liquid nitrogen tank body and a third inlet of the cooling medium mixer, wherein the second pressure regulating valve is used for regulating the pressure of output nitrogen in the liquid nitrogen tank body, the second electronic pressure gauge is used for monitoring the pressure of the nitrogen in the nitrogen pipeline in real time, and the second mass flowmeter is used for controlling the flow of the nitrogen entering the cooling medium mixer.
Optionally, the liquid carbon dioxide branch is set to be a pipeline with a fixed caliber, a third electronic pressure gauge and a first automatic regulating valve are arranged on the liquid carbon dioxide branch, the third electronic pressure gauge is used for monitoring the pressure of the liquid carbon dioxide in the liquid carbon dioxide branch in real time, and the first automatic regulating valve is used for regulating and controlling the flow of the liquid carbon dioxide entering the cooling medium mixer under a set pressure range.
Optionally, a fourth electronic pressure gauge and a second automatic regulating valve are arranged on the cooling pipeline, the fourth electronic pressure gauge is used for monitoring the pressure of the cooling medium in the cooling pipeline in real time, and the second automatic regulating valve is used for regulating and controlling the flow of the cooling medium conveyed to the using end of the cooling medium.
Wherein each pressure regulating valve has the function of regulating pressure, and the output pressure of the valve is adjustable under the condition of a certain input pressure. The pressure range of each electronic pressure gauge is 0-100 Bar.
Optionally, the system further comprises a PLC control device, wherein the PLC control device is in communication connection with the first electronic pressure gauge, the second electronic pressure gauge, the third electronic pressure gauge, the fourth electronic pressure gauge, the first mass flow meter, the second mass flow meter, the first automatic regulating valve and the second automatic regulating valve so as to respectively regulate the flow of liquid carbon dioxide, gaseous carbon dioxide and nitrogen according to the acquired real-time pressure values.
Optionally, the device further comprises a temperature sensor which is arranged at the cooling medium using end and is in communication connection with the PLC control device, so that the real-time temperature of the cooling medium is transmitted to the PLC control device, and the PLC control device can adjust the flow of liquid carbon dioxide, gaseous carbon dioxide and nitrogen or adjust the flow of the cooling medium which is transmitted to the cooling medium using end.
Optionally, the cooling pipeline is provided with a plurality of cooling branches, each cooling branch is connected with a cooling medium using end, and each cooling medium using end is respectively provided with a temperature sensor in communication connection with the PLC control device.
Optionally, a safety valve is arranged between the branch switch valve and the inlet switch valve in the liquid carbon dioxide loop, and a safety valve is also arranged between the cooling medium mixer and the third electronic pressure gauge in the liquid carbon dioxide branch, wherein the two safety valves are valves with certain set values, and when the pressure in the system exceeds a certain value, the two safety valves take off and become a passage to discharge gas or liquid in the system, so that the pressure is ensured not to exceed a threshold value.
Optionally, a check valve is installed in the liquid carbon dioxide branch, and the check valve is a one-way valve, so that the liquid carbon dioxide can only flow along one direction, and can flow to the cooling medium mixer to prevent the liquid carbon dioxide from flowing back into the liquid carbon dioxide tank.
Optionally, a purifier is provided in the nitrogen line.
The invention achieves at least the following advantages: (1) The cooling gas is controlled to be in a mixed state of liquid carbon dioxide and gaseous carbon dioxide, and is sprayed to the surface of the workpiece through a special nozzle, so that the cooling gas is quickly evaporated on the surface of the workpiece at high temperature, and a large amount of heat is taken away; (2) The gaseous carbon dioxide and the liquid carbon dioxide are mixed for use, so that the defect that the pure liquid carbon dioxide is easy to freeze in a pipeline is effectively overcome, and the use efficiency of the liquid carbon dioxide is improved; (3) Liquid nitrogen is used as a second cooling gas to be mixed with liquid carbon dioxide, so that the problem of unstable stock of gaseous carbon dioxide in the tank body is effectively solved; (4) Mixing gaseous carbon dioxide into the liquid carbon dioxide, and adjusting the mixing ratio of the liquid carbon dioxide and the gaseous carbon dioxide to obtain an accurate cooling effect; (5) The flow rate of the gaseous carbon dioxide and the flow rate of the nitrogen are controlled by adopting a mass flowmeter, and the flow channel with a fixed caliber is adopted as a pipeline through which the liquid carbon dioxide circulates, so that the overall flow rate is controlled by pressure under the condition that the caliber of the pipeline is fixed, and the PLC ensures the stability of the flow rate by adjusting the opening and closing of an automatic regulating valve and controlling the pressure of the pipeline within a certain range, thereby realizing the accurate control of the cooling effect; (6) And the PLC adjusts the proportion of the gaseous liquid mixture or directly adjusts the whole flow to cool through the real-time reading of the set temperature sensor, so that the cooling effect is ensured.
Drawings
Fig. 1 shows a schematic configuration of a carbon dioxide cooling system for thermal spraying according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
First, before describing the embodiments, it is necessary to explain some terms presented herein. For example: where the terms "first," "second," and the like are used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. Thus, a "first" element could also be termed a "second" element without departing from the teachings of the present invention.
In addition, it will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements present.
The various terms presented herein are used for the purpose of describing particular embodiments only and are not intended to be limiting of the invention. The singular is intended to include the plural unless the context clearly indicates otherwise. When the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence and/or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The carbon dioxide cooling system for thermal spraying of the present invention is specifically described below with reference to the accompanying drawings.
As shown in fig. 1, as a non-limiting embodiment, the carbon dioxide cooling system for thermal spraying of the present invention includes a liquid carbon dioxide tank 1, a cooling medium mixer 2, and a cooling medium use end 3.
The top of the liquid carbon dioxide tank 1 is provided with a tank upper outlet 10, and the bottom of the liquid carbon dioxide tank is provided with a tank lower outlet 11 and a tank lower inlet 12. The cooling medium mixer 2 includes: the mixer comprises a mixer body (not shown), a mixer outlet (not shown) arranged on the mixer body, a first inlet (not shown) and a second inlet (not shown), wherein the mixer outlet is connected with a cooling medium using end 3 through a cooling pipeline LL. The tank body lower outlet 11 is communicated with the tank body lower inlet 12 through a pipeline to form a liquid carbon dioxide loop LH, a low-temperature pump P is arranged on the liquid carbon dioxide loop LH, a liquid carbon dioxide branch LZ is led out of the liquid carbon dioxide loop LH, the liquid carbon dioxide branch LZ is connected with a first inlet of the cooling medium mixer 2, and the tank body upper outlet 10 is connected with a second inlet of the cooling medium mixer 2 through a gaseous carbon dioxide pipeline LQ.
Because the carbon dioxide stored in the liquid carbon dioxide tank 1 is liquid, the carbon dioxide is concentrated below the tank, and the carbon dioxide is in a gaseous state above the tank. If the pressure of the liquid carbon dioxide is reduced when the liquid carbon dioxide circulates in the pipeline, the liquid carbon dioxide can be quickly changed into a solid state, so that the liquid carbon dioxide is frozen in the pipeline, and the pipeline is blocked. Thus, the invention uses the cryopump P to lead out liquid carbon dioxide from the lower part of the liquid carbon dioxide tank body 1, and then returns to the bottom of the storage tank to form a liquid carbon dioxide loop LH. Because the cryopump P has a certain pressurizing effect, the liquid carbon dioxide in the loop will remain in a liquid state and will not freeze, and a side stream is led out from the liquid carbon dioxide loop LH, that is, the liquid carbon dioxide branch LZ is used as carbon dioxide for cooling. But also easily causes freezing of the tributary piping due to the rapid pressure drop of the liquid carbon dioxide when it reaches the end of use. In addition, due to the existence of the cryopump P in the liquid carbon dioxide circuit LH, the pressure in the liquid carbon dioxide tank 1 will slowly rise, once the pressure exceeds a safety value, the safety valve on the liquid carbon dioxide tank 1 will jump, and the pressure in the liquid carbon dioxide tank 1 will be released, resulting in an instantaneous pressure drop, which will easily cause the freezing of the liquid carbon dioxide in the liquid carbon dioxide tank 1. Therefore, the invention leads out the gaseous carbon dioxide at the upper end of the liquid carbon dioxide tank body 1, mixes the gaseous carbon dioxide with the liquid carbon dioxide led out by the liquid carbon dioxide branch LZ, changes the carbon dioxide in the cooling medium mixer 2 into a liquid and gaseous mixed state, and then uses the mixed state as the cooling medium, thereby not only solving the problem of the pressure rise of the liquid carbon dioxide tank body 1, but also avoiding the freezing problem of the pressure drop of the liquid carbon dioxide in the liquid carbon dioxide branch LZ.
In order to ensure the flowing state of the liquid carbon dioxide in the liquid carbon dioxide circuit LH, an outlet switch valve S1, a cryogenic pump P, a bypass switch valve S2 and an inlet switch valve S3 are sequentially arranged on a pipeline from an outlet 11 under the tank body to an inlet 12 under the tank body in the liquid carbon dioxide circuit LH, and a liquid carbon dioxide bypass LZ is led out between the pipelines of the cryogenic pump P and the bypass switch valve S2.
The mixed state of the gaseous carbon dioxide and the liquid carbon dioxide is introduced, so that the problem of freezing of the liquid carbon dioxide is solved, but the stock of the gaseous carbon dioxide in the liquid carbon dioxide tank body 1 is unstable, and insufficient conditions often occur. Therefore, the introduction of the second gas is required to replace carbon dioxide and liquid carbon dioxide to be mixed when the flow rate of gaseous carbon dioxide is insufficient. Thus, as another non-limiting embodiment, the system is further provided with a liquid nitrogen tank 4, the mixer body of the cooling medium mixer 2 is further provided with a third inlet (not shown in the figure), and the outlet (not shown in the figure) of the liquid nitrogen tank 4 is connected with the third inlet of the cooling medium mixer 2 through a nitrogen pipeline LD, thereby introducing nitrogen gas as the second gas for mixed cooling with liquid carbon dioxide.
In this non-limiting embodiment, as shown in fig. 1, in the gaseous carbon dioxide line LQ, a first pressure regulating valve F1, a first electronic pressure gauge Y1 and a first mass flow meter Z1 are sequentially disposed between the outlet 10 above the tank body and the second inlet of the cooling medium mixer 2, wherein the first pressure regulating valve F1 is used for regulating the pressure of the gaseous carbon dioxide output from the liquid carbon dioxide tank body 1, the first electronic pressure gauge Y1 is used for monitoring the pressure of the gaseous carbon dioxide in the gaseous carbon dioxide line LQ in real time, and the first mass flow meter Z1 is used for controlling the flow rate of the gaseous carbon dioxide entering the cooling medium mixer 2.
In the nitrogen pipeline LD, a second pressure regulating valve F2, a second electronic pressure gauge Y2 and a second mass flowmeter Z2 are sequentially arranged between the outlet of the liquid nitrogen tank 4 and the third inlet of the cooling medium mixer 2, wherein the second pressure regulating valve F2 is used for regulating the pressure of the output nitrogen in the liquid nitrogen tank 4, the second electronic pressure gauge Y2 is used for monitoring the pressure of the nitrogen in the nitrogen pipeline LD in real time, and the second mass flowmeter Z2 is used for controlling the flow of the nitrogen entering the cooling medium mixer 2.
As yet another non-limiting embodiment, the liquid carbon dioxide branch LZ is set as a pipeline with a fixed caliber, and a third electronic pressure gauge Y3 and a first automatic regulating valve T1 are arranged on the liquid carbon dioxide branch LZ, wherein the third electronic pressure gauge Y3 is used for monitoring the pressure of the liquid carbon dioxide in the liquid carbon dioxide branch LZ in real time, and the first automatic regulating valve T1 is used for regulating and controlling the flow of the liquid carbon dioxide entering the cooling medium mixer 2 under the set pressure range.
As shown in fig. 1, a fourth electronic pressure gauge Y4 and a second automatic regulating valve T2 are disposed on the cooling pipeline LL, the fourth electronic pressure gauge Y4 is used for monitoring the pressure of the cooling medium in the cooling pipeline LL in real time, and the second automatic regulating valve T2 is used for regulating and controlling the flow of the cooling medium delivered to the cooling medium using end 3.
When the ratio of gaseous carbon dioxide to liquid carbon dioxide is changed and is controlled randomly, the cooling effect has larger fluctuation, so that the ratio of gaseous carbon dioxide to liquid carbon dioxide and the total flow thereof need to be adjusted to obtain a stable cooling effect. Thus, a PLC control device 5 is introduced herein, and the PLC control device 5 is in communication connection with the first electronic pressure gauge Y1, the second electronic pressure gauge Y2, the third electronic pressure gauge Y3, the fourth electronic pressure gauge Y4, the first mass flow meter Z1, the second mass flow meter Z2, the first automatic regulating valve T1 and the second automatic regulating valve T2 (shown by dashed lines in the figure) so as to respectively regulate the flow rates of the liquid carbon dioxide, the gaseous carbon dioxide and the nitrogen according to the acquired real-time pressure values.
Therefore, the flow rate of the gaseous carbon dioxide and the flow rate of the nitrogen are controlled by adopting a mass flowmeter, the flow channel with a fixed caliber is adopted as a pipeline through which the liquid carbon dioxide flows, the total flow rate is controlled by pressure under the condition that the caliber of the pipeline is fixed, and the PLC control device ensures the stability of the flow rate by adjusting the opening and closing size of an automatic regulating valve and controlling the pressure of the pipeline within a certain range, so that the same pressure control method is adopted for the mixture of the gas and the liquid, namely the cooling medium.
In order to realize finer cooling, one or more temperature sensors 6 are arranged at the cooling medium using end 3 and are in communication connection with the PLC control device 5, and the PLC control device 5 can adjust the proportion of the mixture of liquid carbon dioxide and gaseous carbon dioxide and nitrogen or directly adjust the whole flow rate for cooling according to the real-time reading of the temperature sensors 6.
As a further non-limiting embodiment, a plurality of cooling paths may be provided at the rear section of the cooling medium mixer 2, i.e. the cooling line may be provided with a plurality of cooling branches, each cooling branch being connected to a cooling medium application end, so as to realize cooling at different positions, each path may be provided with a temperature sensor, and the PLC control device 5 controls each path individually.
In this non-limiting embodiment, the PLC control device 5 will decide to increase or decrease the proportion of liquid or increase or decrease the overall flow rate according to the built-in algorithm based on the temperature reading. The built-in algorithm of the PLC control device 5 adjusts the mass flow meters of the carbon dioxide gas and the nitrogen gas according to the measured pressure of the liquid carbon dioxide, so that the ratio of the gas and the liquid reaches the required range. The built-in algorithm of the PLC control device 5 determines the ratio of carbon dioxide gas and nitrogen gas according to the numerical state of the pressure gauge of carbon dioxide and nitrogen gas, so as to ensure stable supply of the gas. In addition, the built-in algorithm of the PLC control device 5 can adjust each mass flowmeter and the automatic valve in a multi-path cooling state, so that the distribution of the total flow in each branch is ensured, and the multi-path cooling effect is ensured.
In order to improve the safety of the system, as shown in fig. 1, a safety valve SF is provided between the branch switching valve S2 and the inlet switching valve S3 in the liquid carbon dioxide circuit LH, a check valve ZF is provided in the liquid carbon dioxide branch LZ, a safety valve SF is also provided between the cooling medium mixer 2 and the third electronic pressure gauge Y3, and a purifier J is provided in the nitrogen line LD.
It can be seen that the liquid carbon dioxide flows out from the lower part of the liquid carbon dioxide tank 1 under the drive of the cryopump and then returns to the lower part of the liquid carbon dioxide tank 1, so that a flowing carbon dioxide loop is formed, and carbon dioxide in the loop flows and cannot be frozen. The liquid carbon dioxide is led out of the loop, but due to the existence of the low-temperature pump, the pressure in the tank body is increased as a slow booster pump, when the pressure reaches a certain degree, the safety valve of the pipe is tripped, gaseous carbon dioxide above the liquid carbon dioxide tank body 1 is discharged, the pressure in the tank body is reduced, and waste is caused, so that the gaseous carbon dioxide above the inside of the liquid carbon dioxide tank body 1 is led out and the liquid carbon dioxide led out from the main loop are mixed for cooling, the waste of the liquid carbon dioxide is effectively avoided, and because the liquid carbon dioxide led out from the main loop flows and the liquid carbon dioxide continuously flowing in the main loop is different, once the liquid carbon dioxide in the led-out pipeline is stopped for use, the required liquid carbon dioxide can not be obtained when the liquid carbon dioxide is reused, and the problem of freezing is solved after the gaseous carbon dioxide and the liquid carbon dioxide are mixed is led in, and in addition, the cooling effect of the liquid carbon dioxide is very good, but the cooling effect of the liquid carbon dioxide is difficult to control accurately.
Although preferred embodiments of the present invention have been described in detail herein, it is to be understood that the invention is not limited to the precise construction and steps set forth herein, and that other modifications and variations may be effected by one skilled in the art without departing from the spirit and scope of the invention.
Claims (10)
1. The utility model provides a carbon dioxide cooling system for thermal spraying, includes the liquid carbon dioxide jar body, the top of liquid carbon dioxide jar body is concentrated and is had gaseous carbon dioxide, the below of liquid carbon dioxide jar body is concentrated and is had liquid carbon dioxide, the top of liquid carbon dioxide jar body is equipped with jar body top export, the bottom of liquid carbon dioxide jar body is equipped with jar body below export and jar body below entry, its characterized in that still includes the cooling medium blender, the cooling medium blender includes: the cooling device comprises a mixer body, a first inlet, a second inlet and a mixer outlet, wherein the first inlet, the second inlet and the mixer outlet are arranged on the mixer body, and the mixer outlet is connected with a cooling medium using end through a cooling pipeline;
the outlet below the tank body is communicated with the inlet below the tank body through a pipeline to form a liquid carbon dioxide loop, a low-temperature pump is arranged on the liquid carbon dioxide loop, a liquid carbon dioxide branch is led out of the liquid carbon dioxide loop, and the liquid carbon dioxide branch is connected with the first inlet of the cooling medium mixer;
the outlet above the tank body is connected with the second inlet of the cooling medium mixer through a gaseous carbon dioxide pipeline.
2. The carbon dioxide cooling system for thermal spraying according to claim 1, wherein an outlet switching valve, the cryopump, a bypass switching valve, and an inlet switching valve are sequentially provided in the liquid carbon dioxide circuit from an outlet below the tank to an inlet below the tank, and the liquid carbon dioxide bypass is led out between the cryopump and the bypass switching valve.
3. The carbon dioxide cooling system for thermal spraying according to claim 1, further comprising a liquid nitrogen tank, wherein the mixer body of the cooling medium mixer is further provided with a third inlet, and an outlet of the liquid nitrogen tank is connected with the third inlet of the cooling medium mixer through a nitrogen pipeline.
4. The carbon dioxide cooling system for thermal spraying according to claim 3, wherein a first pressure regulating valve, a first electronic pressure gauge and a first mass flowmeter are sequentially arranged in the gaseous carbon dioxide pipeline from an outlet above the tank body to a second inlet of the cooling medium mixer, wherein the first pressure regulating valve is used for regulating the pressure of the gaseous carbon dioxide output from the liquid carbon dioxide tank body, the first electronic pressure gauge is used for monitoring the pressure of the gaseous carbon dioxide in the gaseous carbon dioxide pipeline in real time, and the first mass flowmeter is used for controlling the flow rate of the gaseous carbon dioxide entering the cooling medium mixer.
5. The carbon dioxide cooling system for thermal spraying according to claim 4, wherein a second pressure regulating valve, a second electronic pressure gauge and a second mass flow meter are sequentially arranged in the nitrogen pipeline from an outlet of the liquid nitrogen tank body to a third inlet of the cooling medium mixer, wherein the second pressure regulating valve is used for regulating the pressure of output nitrogen in the liquid nitrogen tank body, the second electronic pressure gauge is used for monitoring the pressure of the nitrogen in the nitrogen pipeline in real time, and the second mass flow meter is used for controlling the flow rate of the nitrogen entering the cooling medium mixer.
6. The carbon dioxide cooling system for thermal spraying according to claim 5, wherein the liquid carbon dioxide branch is set as a pipeline with a fixed caliber, a third electronic pressure gauge and a first automatic regulating valve are arranged on the liquid carbon dioxide branch, the third electronic pressure gauge is used for monitoring the pressure of the liquid carbon dioxide in the liquid carbon dioxide branch in real time, and the first automatic regulating valve is used for regulating and controlling the flow of the liquid carbon dioxide entering the cooling medium mixer under a set pressure range.
7. The carbon dioxide cooling system for thermal spraying according to claim 6, wherein a fourth electronic pressure gauge and a second automatic regulating valve are arranged on the cooling pipeline, the fourth electronic pressure gauge is used for monitoring the pressure of the cooling medium in the cooling pipeline in real time, and the second automatic regulating valve is used for regulating and controlling the flow rate of the cooling medium which is conveyed to the cooling medium using end.
8. The carbon dioxide cooling system for thermal spraying of claim 7, further comprising a PLC control device communicatively coupled to the first electronic pressure gauge, the second electronic pressure gauge, the third electronic pressure gauge, the fourth electronic pressure gauge, the first mass flow meter, the second mass flow meter, the first automatic regulating valve, and the second automatic regulating valve to respectively regulate the flow rates of the liquid carbon dioxide, the gaseous carbon dioxide, and the nitrogen gas according to the obtained real-time pressure values.
9. The carbon dioxide cooling system for thermal spraying of claim 8, further comprising a temperature sensor disposed at the cooling medium use end in communication with the PLC control device to communicate a real-time temperature of the cooling medium to the PLC control device, thereby causing the PLC control device to adjust the flow rates of the liquid carbon dioxide, the gaseous carbon dioxide, and the nitrogen gas or the flow rate of the cooling medium delivered to the cooling medium use end.
10. The carbon dioxide cooling system for thermal spraying according to claim 9, wherein the cooling line is provided with a plurality of cooling branches, each cooling branch being connected to one of the cooling medium use terminals, each of the cooling medium use terminals being provided with a temperature sensor in communication with the PLC control device, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310729453.7A CN116989499A (en) | 2023-06-19 | 2023-06-19 | Carbon dioxide cooling system for thermal spraying |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310729453.7A CN116989499A (en) | 2023-06-19 | 2023-06-19 | Carbon dioxide cooling system for thermal spraying |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116989499A true CN116989499A (en) | 2023-11-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310729453.7A Pending CN116989499A (en) | 2023-06-19 | 2023-06-19 | Carbon dioxide cooling system for thermal spraying |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116989499A (en) |
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2023
- 2023-06-19 CN CN202310729453.7A patent/CN116989499A/en active Pending
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