CN219673952U - Fixed-proportion high-pressure mixed gas supply system - Google Patents
Fixed-proportion high-pressure mixed gas supply system Download PDFInfo
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- CN219673952U CN219673952U CN202223076528.6U CN202223076528U CN219673952U CN 219673952 U CN219673952 U CN 219673952U CN 202223076528 U CN202223076528 U CN 202223076528U CN 219673952 U CN219673952 U CN 219673952U
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- 239000007788 liquid Substances 0.000 claims abstract description 167
- 239000006200 vaporizer Substances 0.000 claims abstract description 25
- 238000002156 mixing Methods 0.000 claims description 12
- 230000008016 vaporization Effects 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 230000003749 cleanliness Effects 0.000 claims description 3
- 238000009834 vaporization Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 56
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 50
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 24
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 abstract description 22
- 238000005265 energy consumption Methods 0.000 abstract description 8
- 239000012535 impurity Substances 0.000 abstract description 5
- DOTMOQHOJINYBL-UHFFFAOYSA-N molecular nitrogen;molecular oxygen Chemical compound N#N.O=O DOTMOQHOJINYBL-UHFFFAOYSA-N 0.000 abstract description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 13
- 239000001301 oxygen Substances 0.000 description 13
- 229910052760 oxygen Inorganic materials 0.000 description 11
- 238000007906 compression Methods 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 229910001882 dioxygen Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- OLBVUFHMDRJKTK-UHFFFAOYSA-N [N].[O] Chemical compound [N].[O] OLBVUFHMDRJKTK-UHFFFAOYSA-N 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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Abstract
The utility model relates to the technical field of aerospace, in particular to a proportional high-pressure mixed air supply system which comprises a first air supply mechanism, a second air supply mechanism, a low-temperature liquid mixer, a low-temperature liquid vaporizer and an output buffer tank, wherein the first air supply mechanism comprises a first low-temperature liquid storage tank and first low-temperature liquid pressurizing equipment, and the second air supply mechanism comprises a second low-temperature liquid storage tank and second low-temperature liquid pressurizing equipment. The output ends of the first air supply mechanism and the second air supply mechanism are connected with the input end of the low-temperature liquid mixer, the output end of the low-temperature liquid mixer is connected with the low-temperature liquid vaporizer, the output end of the vaporizer is connected with the high-pressure buffer tank, and the output end of the high-pressure buffer tank is connected with the air terminal. When liquid oxygen and liquid nitrogen are used as the first medium and the second medium respectively, the system can output the artificial air with the same nitrogen-oxygen ratio as the air, can replace a traditional high-pressure compressed air supply system with large scale and high energy consumption, greatly reduces the energy consumption, and can not lead to the damage of gas using equipment caused by the introduction of impurities such as greasy dirt, particulate matters and the like. The system is used in the field of aerospace, and can effectively improve the reliability of aerospace tasks.
Description
Technical Field
The utility model relates to the technical field of aerospace, in particular to a fixed-proportion high-pressure mixed air supply system.
Background
The high-pressure compressed air is a common industrial gas, and is widely applied to various fields of aviation, aerospace and the like, and is used as gas for operation, control, raw materials, environmental preservation and the like.
The prior art generally adopts complicated multistage air compressors to compress air and then supplies the compressed air to users in the modes of oil removal, impurity removal, filtration and drying. The air compression process is easy to introduce impurities such as oil stains, particles and the like to cause the damage of air utilization equipment and the failure of user tasks. The complex structure of the multi-stage compressor also results in reduced system reliability.
Disclosure of Invention
Therefore, the utility model aims to solve the technical problems of damage to gas equipment, high energy consumption and low reliability caused by easy introduction of impurities such as greasy dirt, particulate matters and the like in the air compression process in the prior art.
The utility model provides a fixed-proportion high-pressure mixed gas supply system, which comprises:
the first air supply mechanism comprises a first low-temperature liquid storage tank and a first low-temperature liquid pressurizing device, wherein the first low-temperature liquid storage tank is suitable for storing a first medium, and the first low-temperature liquid pressurizing device is suitable for converting the first low-temperature liquid into a high-pressure liquid state and outputting the first low-temperature liquid;
the second air supply mechanism comprises a second low-temperature liquid storage tank and a second low-temperature liquid pressurizing device, the second low-temperature liquid storage tank is suitable for storing a second medium, and the second low-temperature liquid pressurizing device is suitable for converting the second low-temperature liquid into a high-pressure liquid state and outputting the second low-temperature liquid;
the mixed vaporization buffering output mechanism comprises a low-temperature liquid mixer, a low-temperature liquid vaporizer and an output buffer tank.
The output ends of the first air supply mechanism and the second air supply mechanism are connected with the inlet of the low-temperature liquid mixer, the outlet of the low-temperature liquid mixer is connected with the inlet of the low-temperature liquid vaporizer, the outlet of the low-temperature liquid vaporizer is connected with the inlet of the output buffer tank, and the outlet of the output buffer tank is connected with the air terminal.
The high-pressure liquid first medium output by the first air supply mechanism and the high-pressure liquid second medium output by the second air supply mechanism are both conveyed to the low-temperature liquid mixer, high-pressure mixed liquid is formed in the low-temperature liquid mixer and enters the low-temperature liquid vaporizer, the low-temperature liquid vaporizer is suitable for vaporizing the high-pressure mixed liquid, and the high-pressure gaseous mixed medium with stable pressure is output by connecting an output buffer tank with an air device.
Further, the constant-proportion high-pressure mixed gas supply system comprises a first pump body and a second low-temperature liquid pressurizing device comprising a second pump body, wherein the first pump body and the second pump body are both reciprocating piston pumps, and the constant flow characteristic of the reciprocating piston pumps can ensure that the mixing of two mediums basically keeps constant proportion.
Further, in the fixed-ratio high-pressure mixed gas supply system, the medium output by the first gas supply mechanism and the medium output by the second gas supply mechanism are mixed in the low-temperature liquid mixer in a low-temperature high-pressure liquid mode, the low-temperature liquid mixer adopts a narrow cavity structure, and the low-temperature liquid mixer can be forced to form uniformly mixed low-temperature liquid medium in the low-temperature liquid mixer by matching with the pulse output characteristic of the reciprocating piston pump.
Furthermore, in the fixed-proportion high-pressure mixed gas supply system, the first medium and the second medium are respectively single-type high-purity low-temperature liquid, and the high-purity low-temperature liquid is used as a raw material for mixed gas supply, so that the cleanliness of the output mixed gas is ensured.
Further, the proportional high-pressure mixed gas supply system further comprises:
the pump frequency converter is connected with the mixed gas proportion on-line analysis component to form combined closed-loop control. The frequency converter is connected with the first low-temperature liquid pressurizing device and/or the second low-temperature liquid pressurizing device and is suitable for controlling the output flow of the first medium or the second medium, and the flow of the second medium or the first medium is kept constant, so that the mixing proportion of the two mediums is controlled to be a stable value, the operation frequency and the corresponding flow of the first low-temperature liquid pressurizing device or the second low-temperature liquid pressurizing device are adjusted according to the set required proportion according to the actual proportion of the two mediums in the mixed gas, and the actual proportion of the two mediums in the output mixed gas is consistent with the set mixing proportion;
further, the proportional high-pressure mixed gas supply system, the first gas supply mechanism further comprises:
a first return line connecting a gas phase end of the first cryogenic liquid storage tank with a liquid bath end of the first pump body, adapted to return the first medium vaporized in the first pump body to the first cryogenic liquid storage tank;
a second return pipe connecting the gas phase end of the second cryogenic liquid storage tank with the liquid bath end of the second pump body, adapted to return the second medium vaporized in the second pump body to the second cryogenic liquid storage tank;
the first return pipe and the second return pipe are suitable for timely exhausting gas when cavitation occurs between the first pump body and the second pump body due to external heat leakage, so that normal operation of the first pump body and the second pump body is ensured, and medium and cold energy can be saved.
Further, the fixed-proportion high-pressure mixed gas supply system comprises a first gas supply mechanism and a second gas supply mechanism, wherein the first gas supply mechanism further comprises a first temperature sensor, and the first temperature sensor is arranged on the first pump body and is suitable for detecting the temperature of the first pump body;
the second air supply mechanism is provided with a second temperature sensor, and the second temperature sensor is arranged on the second pump body and is suitable for detecting the temperature of the second pump body;
a third temperature sensor and a first pressure sensor are further arranged on a pipeline between the first pump body and the low-temperature liquid mixer, and the pipeline is suitable for detecting and judging whether cavitation occurs in the first pump body;
a fourth temperature sensor and a second pressure sensor are further arranged on the pipeline between the second pump body and the low-temperature liquid mixer, and the pipeline is suitable for detecting and judging whether cavitation occurs in the second pump body or not;
the temperature and pressure detection arranged on the first air supply mechanism and the second air supply mechanism can provide the real-time working conditions of the first pump body and the second pump body for the control system. When the temperature and pressure detection data show that cavitation occurs in the pump, the alarm can be given out timely, and cavitation is eliminated by opening the vent valve on the pump reflux pipe and the vent valve on the pump outlet pipe, and timely discharging the cavitation-causing gas.
The technical scheme of the utility model has the following advantages:
1. the constant-proportion high-pressure mixed gas supply system provided by the utility model uses two single pure low-temperature liquids as raw material mediums to perform constant-proportion real-time high-pressure mixing and vaporization under liquid state, and provides pure high-pressure mixed gas with stable mixing ratio for a gas utilization device.
2. The constant-proportion high-pressure mixed gas supply system provided by the utility model can ensure that the mixture of two media is kept at a constant proportion based on the constant flow characteristic of the reciprocating piston pump, and can conveniently realize the gas supply pressure of 35MPa and higher. The low-temperature liquid mixer adopts a narrow cavity structure, and can force the two mediums to form uniformly mixed low-temperature liquid mediums in the low-temperature liquid mixer by matching with the pulse output characteristic of the reciprocating piston pump, so as to realize a high-pressure mixing process with stable mixing ratio.
3. The constant-proportion high-pressure mixed gas supply system provided by the utility model adopts a closed-loop control technical scheme of combining the mixed gas proportion on-line analysis component with the variable frequency control of the piston pump motor, and can realize real-time fine adjustment of the low-temperature liquid high-pressure mixed proportion, so that the gas mixed proportion is more accurate and stable.
4. According to the fixed-proportion high-pressure mixed gas supply system provided by the utility model, the low-temperature liquid pressurizing equipment is provided with the gas phase backflow function of the liquid pool, and the sensors such as temperature and pressure are arranged to realize the on-line detection of the pump state, so that the combination of the two can ensure the stable and reliable operation of the pressurizing equipment.
5. The constant-proportion high-pressure mixed gas supply system provided by the utility model does not need to use complex mechanical equipment such as a compressor and huge matched equipment, and can not lead in impurities such as greasy dirt, particulate matters and the like to cause the damage of gas utilization equipment during gas supply, and has the advantages of simple structure, high reliability, convenience in operation, fewer potential safety hazards and low use cost. When liquid oxygen is used as a first medium and liquid nitrogen is used as a second medium, high-pressure oil-free artificial air with high cleanliness can be output to replace a large-scale high-energy-consumption high-pressure compressed air supply system, the power consumption is only 10% of that of a traditional air compressor, the energy consumption is greatly reduced, and the reliability and success rate of user tasks are improved.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a hybrid gas supply system provided in an embodiment of the present utility model;
reference numerals illustrate: 1. a first cryogenic liquid storage tank; 11. a first pump body; 12. a first pump motor; 13. a first temperature sensor; 14. a third temperature sensor; 15. a first pressure sensor; 16. a first return pipe; 17. a frequency converter; 2. a second cryogenic liquid storage tank; 21. a second pump body; 22. a second pump motor; 23. a second temperature sensor; 24. a fourth temperature sensor; 25. a second pressure sensor; 26. a second return pipe; 3. a cryogenic liquid mixer; 4. a cryogenic liquid vaporizer; 5. an output buffer tank; 6. and the mixed gas proportion online analysis component.
Detailed Description
The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiment is one embodiment of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
Examples
As shown in fig. 1, the constant-ratio high-pressure mixed air supply system provided by the utility model comprises a first air supply mechanism, a second air supply mechanism, a low-temperature liquid mixer 3, a low-temperature liquid vaporizer 4 and a buffer tank 5, wherein the first air supply mechanism comprises a first low-temperature liquid storage tank 1 and a first low-temperature liquid pressurizing device which store a first medium, the second air supply mechanism comprises a second low-temperature liquid storage tank 2 and a second low-temperature liquid pressurizing device which store a second medium, an inlet of the low-temperature liquid mixer 3 is connected with the first air supply mechanism and the second air supply mechanism, and an outlet of the low-temperature liquid mixer 3 is connected with an inlet of the low-temperature liquid vaporizer 4. The low-temperature liquid vaporizer 4 is suitable for heating and vaporizing the mixed medium of the first medium and the second medium, the inlet end of the output buffer tank 5 is connected with the outlet end of the vapor low-temperature liquid vaporizer 4, and the outlet end of the output buffer tank 5 conveys the mixed gas to the gas utilization device.
The system does not specifically limit the first medium, and in order to meet the practical situation, in this embodiment, the first medium is liquid oxygen, and the first low-temperature liquid storage tank 1 is a liquid oxygen tank.
The system does not specifically limit the second medium, and in this embodiment, the second medium is liquid nitrogen, and the second low-temperature liquid storage tank 2 is a liquid nitrogen tank, so as to meet the practical situation.
The liquid oxygen pressurizing equipment and the liquid nitrogen pressurizing equipment of the system all adopt piston pumps with liquid pools. The flow configuration of the liquid oxygen pressurizing equipment and the liquid nitrogen pressurizing equipment is about 1 by taking the oxygen-nitrogen ratio in the air as a target: 4 molar ratio.
The system does not limit the form of the cryogenic liquid vaporizer 4, and in order to meet the practical situation, the cryogenic liquid vaporizer 4 in this embodiment adopts an air-bath type high-pressure vaporizer.
The first cryogenic liquid pressurizing device (liquid oxygen pump) pressurizes the liquid oxygen in the liquid oxygen tank to the cryogenic liquid mixer 3, and the second cryogenic liquid pressurizing device (liquid nitrogen pump) pressurizes the liquid nitrogen in the liquid nitrogen tank and simultaneously delivers the liquid nitrogen to the cryogenic liquid mixer 3. Since the flow rates of the liquid oxygen pump and the liquid nitrogen pump are basically matched, the ratio of the liquid oxygen to the liquid nitrogen entering the cryogenic liquid mixer 3 basically accords with the ratio of the oxygen to the nitrogen in the air. The liquid oxygen and liquid nitrogen mixture is heated and vaporized to normal temperature and high pressure gas in the low temperature liquid vaporizer 4 and is conveyed to the buffer tank 5, and is conveyed to the gas utilization device from the outlet end of the buffer tank 5. The main components of the air are nitrogen and oxygen, so that the gas mixed according to the proportion of oxygen and nitrogen in the air can be directly output for use as high-cleanliness air.
In this embodiment, the first air supply mechanism is provided with a frequency converter 17, and the frequency converter 17 is connected with the liquid oxygen pump. An on-line mixed gas proportion analysis part 6 is also arranged at the sampling point of the buffer tank 5 and is used for monitoring the oxygen content of the medium in the buffer tank 5 to obtain oxygen content data. The mixed gas proportion online analysis part 6 is connected with the frequency converter 17 for closed loop control, and the frequency converter 17 finely adjusts the output flow of the liquid oxygen pump according to the oxygen content data, so that the oxygen content in the mixed gas accurately accords with the standard oxygen content (20.9%) in the atmosphere.
The mixed gas proportion online analysis part 6 of the system is determined according to the first medium and the second medium, and the mixed gas proportion online analysis part 6 adopts an oxygen content analyzer in the embodiment.
The first cryogenic liquid pressurizing device comprises a first pump motor 12 and a first pump body 11, the output end of the first pump motor 12 is connected with the piston part of the first pump body 11, the first pump motor 12 drives the piston part of the first pump body 11 to move so as to drive liquid oxygen in a liquid oxygen tank to be conveyed into the cryogenic liquid vaporizer 4, the second cryogenic liquid pressurizing device comprises a second pump motor 22 and a second pump body 21, the output end of the second pump motor 22 is connected with the piston part of the second pump body 21, and the second pump motor 22 drives the piston part of the second pump body 21 to move so as to drive liquid nitrogen in the liquid nitrogen tank to be conveyed into the cryogenic liquid mixer 3 and the cryogenic liquid vaporizer 4.
The pressure of the first pump body 11 and the second pump body 21 is not particularly limited, and in order to meet the practical situation, in this embodiment, the first pump body 11 and the second pump body 21 adopt a high-pressure piston pump with an output pressure of 35 MPa.
A blow-down pipe is further arranged on the side, close to the output end, of the first pump body 11 and the second pump body 21, and partial gas can be released through the blow-down pipe when the pump is cavitation-etched.
In the first air supply mechanism, a first temperature sensor 13 is arranged on the first pump body 11 and is suitable for detecting the temperature of the first pump body 11, in the second air supply mechanism, a second temperature sensor 23 is arranged on the second pump body 21 and is suitable for detecting the temperature of the second pump body 21, the first air supply mechanism further comprises a first return pipe 16, the first return pipe is connected with a liquid oxygen tank gas phase and a liquid pool of the first pump body 11 and is suitable for returning liquid oxygen vaporized in the first pump body 11 to the liquid oxygen tank, the second air supply mechanism further comprises a second return pipe 26, the second return pipe 26 is connected with a second storage tank 2 gas phase and the second pump body 21 and is suitable for returning liquid nitrogen vaporized in the second pump body 21 to the liquid nitrogen tank.
When the first temperature sensor 13 shows that the temperature in the first pump body 11 is higher than the preset value, gaseous oxygen can be returned to the liquid oxygen tank by opening a control valve on the first return pipe 16. When the second temperature sensor 23 shows that the temperature in the second pump body 21 is higher than the preset value, gaseous nitrogen can be returned to the liquid nitrogen tank by opening a control valve on the second return pipe 26. And vent valves which are communicated with the atmosphere are arranged on the first return pipe 16 and the second return pipe 26, and when the returned oxygen or nitrogen gas is excessive, partial oxygen or nitrogen gas can be released through the control valves, so that the pump body is prevented from being damaged due to pump cavitation. The method can recycle the vaporized medium, reduces the use cost, and has the advantages of simple structure, easy control and convenient operation.
A third temperature sensor 14 and a first pressure sensor 15 are also provided in the line between the first pump body 11 and the liquid mixer 3, adapted to detect the pump outlet temperature and pressure. A fourth temperature sensor 24 and a second pressure sensor 25 are also arranged on the pipeline between the second pump body 21 and the cryogenic liquid vaporizer 4, and are suitable for detecting the temperature and the pressure of the pump outlet. When the temperature sensor is higher than the preset value or the pressure sensor is lower than the preset value, the pump cavitation can be avoided by opening the vent valve on the return pipe and the vent valve at the pump outlet.
In the embodiment, liquid oxygen and liquid nitrogen are mixed, vaporized and buffered after being pressurized, and high-pressure, stable and constant-proportion artificial air can be provided for gas utilization equipment. Based on the flow pulse characteristic and the constant flow characteristic of the reciprocating piston pump, the stability and uniformity of the mixing proportion are ensured. The pump frequency converter and the oxygen content analyzer are matched for use, so that the nitrogen-oxygen mixing proportion is more accurate.
The liquid oxygen and liquid nitrogen are respectively used as the first medium and the second medium, and the system can replace a traditional high-pressure compressed air supply system with large scale and high energy consumption, the energy consumption is only less than 1/10 of that of a compressor, and a complex air compressor and huge matched hydroelectric equipment are not needed. The device has the advantages of simple structure, high reliability, convenient operation, less potential safety hazard, low energy consumption and low use cost.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.
Claims (8)
1. A proportional high pressure hybrid gas supply system, comprising:
a first air supply mechanism comprising a first cryogenic liquid storage tank (1) and a first cryogenic liquid pressurization device, the first cryogenic liquid storage tank (1) being adapted to store a first medium, the first cryogenic liquid pressurization device being adapted to convert the first cryogenic liquid to a high pressure liquid state and output;
a second air supply mechanism including a second cryogenic liquid storage tank (2) and a second cryogenic liquid pressurizing device, the second cryogenic liquid storage tank (2) being adapted to store a second medium, the second cryogenic liquid pressurizing device being adapted to convert the second cryogenic liquid into a high pressure liquid state and output;
the mixed vaporization buffer output mechanism comprises a low-temperature liquid mixer (3), a low-temperature liquid vaporizer (4) and an output buffer tank (5);
the output ends of the first air supply mechanism and the second air supply mechanism are connected with the inlet of the low-temperature liquid mixer (3), the outlet of the low-temperature liquid mixer (3) is connected with the inlet of the low-temperature liquid vaporizer (4), the outlet of the low-temperature liquid vaporizer (4) is connected with the inlet of the output buffer tank (5), and the outlet of the output buffer tank (5) is connected with an air terminal;
the high-pressure liquid first medium output by the first air supply mechanism and the high-pressure liquid second medium output by the second air supply mechanism are both conveyed to the low-temperature liquid mixer (3), high-pressure mixed liquid is formed in the low-temperature liquid mixer (3) and enters the low-temperature liquid vaporizer (4), the low-temperature liquid vaporizer (4) is suitable for vaporizing the high-pressure mixed liquid, the vaporized high-pressure mixed gas enters the output buffer tank (5), and the stable-pressure high-pressure gaseous mixed medium is output to the air utilization device through the output buffer tank (5).
2. The proportional high-pressure mixed gas supply system according to claim 1, wherein the first low-temperature liquid pressurizing device comprises a first pump body (11) and the second low-temperature liquid pressurizing device comprises a second pump body (21), the first pump body (11) and the second pump body (21) are both reciprocating piston pumps, and the constant flow characteristic of the reciprocating piston pumps can ensure that the mixing of two mediums can keep a constant proportion basically.
3. The proportional high-pressure mixed gas supply system according to claim 2, wherein the medium output by the first gas supply mechanism and the medium output by the second gas supply mechanism are mixed in the low-temperature liquid mixer (3) in a low-temperature high-pressure liquid form, the low-temperature liquid mixer (3) adopts a narrow cavity structure, and the first medium and the second medium can be forced to form uniformly mixed low-temperature liquid medium in the low-temperature liquid mixer (3) under the cooperation of the pulse output characteristic of the reciprocating piston pump.
4. The system of claim 1, wherein the first medium and the second medium are each a single type of high-purity cryogenic liquid, and the high-purity cryogenic liquid is used as a raw material for the mixed gas supply, thereby ensuring cleanliness of the output mixed gas.
5. The proportional high-pressure hybrid gas supply system of claim 1, further comprising:
the pump frequency converter (17) is connected with the mixed gas proportion online analysis component (6) to form combined closed loop control, the frequency converter (17) is connected with the first low-temperature liquid pressurizing device and/or the second low-temperature liquid pressurizing device and is suitable for controlling the output flow of the first medium or the second medium, the flow of the second medium or the first medium is kept constant, the mixing proportion of the two mediums is controlled to be a stable numerical value, the operation frequency and the corresponding flow of the first low-temperature liquid pressurizing device or the second low-temperature liquid pressurizing device are adjusted according to the set required proportion in comparison with the actual proportion of the two mediums in the mixed gas, and accordingly the actual proportion of the two mediums in the output mixed gas is consistent with the set mixing proportion.
6. The proportional high-pressure hybrid gas supply system of claim 2, wherein the first gas supply mechanism further comprises:
-a first return pipe (16), the first return pipe (16) connecting a gas phase end of the first cryogenic liquid storage tank (1) with a liquid bath end of the first pump body (11), adapted to return the first medium vaporized in the first pump body (11) to the first cryogenic liquid storage tank (1);
-a second return line (26), said second return line (26) connecting a gas phase end of said second cryogenic liquid storage tank (2) with a liquid bath end of said second pump body (21), adapted to return said second medium vaporized in said second pump body (21) to said second cryogenic liquid storage tank (2);
the first return pipe (16) and the second return pipe (26) are suitable for timely exhausting gas when cavitation occurs between the first pump body (11) and the second pump body (21) due to external heat leakage, so that normal operation of the first pump body (11) and the second pump body (21) is ensured, and medium and cold energy can be saved.
7. The proportional high-pressure mixed gas supply system according to claim 6, wherein the first gas supply mechanism further comprises a first temperature sensor (13), the first temperature sensor (13) being provided on the first pump body (11) and adapted to detect the temperature of the first pump body (11);
the second air supply mechanism is provided with a second temperature sensor (23), and the second temperature sensor (23) is arranged on the second pump body (21) and is suitable for detecting the temperature of the second pump body (21);
a third temperature sensor (14) and a first pressure sensor (15) are further arranged on a pipeline between the first pump body (11) and the low-temperature liquid mixer (3), and the pipeline is suitable for detecting and judging whether cavitation occurs in the first pump body (11);
and a fourth temperature sensor (24) and a second pressure sensor (25) are further arranged on the pipeline between the second pump body (21) and the low-temperature liquid mixer (3), and the pipeline is suitable for detecting and judging whether cavitation occurs in the second pump body (21).
8. The proportional high-pressure mixed gas supply system according to claim 1 or 7, wherein when the temperature and pressure detection shows that cavitation occurs in the pump, the alarm can be given in time and cavitation-causing gas is discharged to the outside in time by opening the vent valve of the pump return pipe and the vent valve of the pump outlet, so that cavitation of the pump is eliminated.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223076528.6U CN219673952U (en) | 2022-11-18 | 2022-11-18 | Fixed-proportion high-pressure mixed gas supply system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223076528.6U CN219673952U (en) | 2022-11-18 | 2022-11-18 | Fixed-proportion high-pressure mixed gas supply system |
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| CN219673952U true CN219673952U (en) | 2023-09-12 |
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| CN202223076528.6U Active CN219673952U (en) | 2022-11-18 | 2022-11-18 | Fixed-proportion high-pressure mixed gas supply system |
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