CN209801147U - control system for preventing cavitation of supercharging device and gas supply system - Google Patents
control system for preventing cavitation of supercharging device and gas supply system Download PDFInfo
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- CN209801147U CN209801147U CN201822071981.5U CN201822071981U CN209801147U CN 209801147 U CN209801147 U CN 209801147U CN 201822071981 U CN201822071981 U CN 201822071981U CN 209801147 U CN209801147 U CN 209801147U
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Abstract
The embodiment of the utility model provides a prevent control system and gaseous feeding system of supercharging device cavitation, control system is applied to gaseous feeding system, gaseous feeding system includes supercharging device, control system includes: the temperature detection device is used for collecting the temperature value of the transmission medium in the gas supply system; and the control device is connected with the temperature detection device and the supercharging device and used for comparing the temperature value of the transmission medium detected by the temperature detection device with a preset temperature threshold value, judging whether the supercharging device can generate cavitation according to the comparison result and controlling the supercharging device to be opened and closed according to the judgment result. The embodiment of the utility model provides a can reduce supercharging device and appear the probability of cavitation.
Description
Technical Field
The utility model relates to a gas conveying equipment's technical field to more specifically, relate to a control system and gas supply system who prevents supercharging device cavitation.
Background
The nitrogen station supply system is widely applied to industrial production processes as a main nitrogen supply system.
In the conventional nitrogen station supply system structure, the nitrogen station supply system mainly comprises simple nitrogen making equipment and a part of connecting pipelines. Because the liquid nitrogen is low in temperature, the liquid is easy to vaporize when being output, and the gas dissolved in the liquid nitrogen is easy to generate cave-shaped corrosion damage to the supercharging device under the conditions of high-speed flow and pressure change, namely the cavitation damage exists. Cavitation can generate noise of various frequencies, damage flow passage components, and simultaneously block flow passages and damage continuous flow of liquid in the nitrogen production equipment.
In summary, how to reduce the occurrence probability of cavitation is a technical problem to be solved urgently by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a prevent control system and gaseous feed system of supercharging device cavitation for reduce among the gaseous feed system probability that the cavitation appears in supercharging device.
In a first aspect, an embodiment of the present invention provides a control system for preventing cavitation of a pressurization device, which is applied to a gas supply system, the gas supply system includes a pressurization device, and the control system includes:
The temperature detection device is used for collecting the temperature value of the transmission medium in the gas supply system;
And the control device is connected with the temperature detection device and the supercharging device and used for comparing the temperature value of the transmission medium detected by the temperature detection device with a preset temperature threshold value, judging whether the supercharging device can generate cavitation according to the comparison result and controlling the supercharging device to be opened and closed according to the judgment result.
In a second aspect, an embodiment of the present invention provides a gas supply system, which includes a storage tank, a pressure boosting device, a vaporization device, and a control system for preventing cavitation of the pressure boosting device according to an embodiment of the present invention,
A first air outlet and a first air return port are arranged on the storage tank, the first air outlet is connected with an inlet pipe of the supercharging device, and the first air return port is connected with an air return pipe of the supercharging device;
The vaporizing device is in sealed communication with an outlet pipe of the pressurizing device and is used for vaporizing the liquid gas flowing out of the pressurizing device to obtain gaseous gas.
The embodiment of the utility model provides a through temperature detection device collection the temperature value of transmission medium in the gas supply system; controlling means with temperature-detecting device reaches supercharging device connects, compares the temperature value that will gather with predetermineeing the temperature threshold value, judges according to the contrast result whether cavitation can appear in supercharging device to control according to the judged result supercharging device's switching, so that cavitation is difficult for appearing in the temperature environment among the gas supply system, thereby the embodiment of the utility model provides a can reduce supercharging device and appear the probability of cavitation, avoid cavitation to cause the destruction to supercharging device.
Drawings
in order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic flow chart of a control method for preventing cavitation of a supercharging device according to an embodiment of the present invention;
Fig. 2 is a schematic structural diagram of a control system for preventing cavitation of a supercharging device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a gas supply system according to an embodiment of the present invention;
Fig. 4 is a second schematic structural diagram of a gas supply system according to an embodiment of the present invention.
Detailed Description
the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
referring to fig. 1, an embodiment of the present invention provides a control method for preventing cavitation of a supercharging device, which is applied to a gas supply system, and includes:
step 101, collecting a temperature value of a transmission medium in the gas supply system.
Wherein, gas supply system can supply gas commonly used in workshop production processes such as nitrogen gas, the embodiment of the utility model provides an in order to supply gas to exemplify for nitrogen gas, when gas supply system supplies for nitrogen gas, transmission medium can be liquid nitrogen or nitrogen gas in the gas supply system, the collection transmission medium's in the gas supply system temperature value, can be through temperature sensor collection liquid nitrogen and/or gaseous nitrogen's in gas supply system's the pipeline temperature value.
And 102, comparing the acquired temperature value with a preset temperature threshold value, judging whether the supercharging device generates cavitation according to the comparison result, and controlling the supercharging device to be opened and closed according to the judgment result.
The preset temperature threshold may be a critical temperature value for determining whether cavitation occurs in the supercharging device. Specifically, the collected temperature value may be higher than a preset temperature threshold, and the supercharging device may suffer from cavitation, in which case, when the comparison result shows that the collected temperature value is higher than the preset temperature threshold, the supercharging device is turned off, otherwise, the supercharging device is turned on; or the collected temperature value is lower than a preset temperature threshold value, cavitation can occur in the supercharging device, and under the condition, when the collected temperature value is lower than the preset temperature threshold value according to the comparison result, the supercharging device is closed, otherwise, the supercharging device is opened.
Taking the temperature at the inlet pipe of the supercharging device as an example for explanation, the temperature value in the inlet pipe can be collected, when cold leakage exists at the inlet of the supercharging device, the temperature value of a transmission medium in the inlet pipe rises, and when the collected temperature value is higher than a preset temperature threshold value, it is judged that cavitation occurs in the supercharging device, so that the supercharging device is closed, and the preset temperature threshold value can be set to-160 ℃ under the condition; or a sealing pipe can be arranged around the periphery of the inlet pipe, the sealing pipe can be made of organic glass materials and can collect temperature values in the sealing pipe, when cold leakage exists at the inlet of the supercharging device, the temperature values in the sealing pipe are reduced, when the collected temperature values are lower than a preset temperature threshold value, the supercharging device is judged to be corroded by cavitation, the supercharging device is closed, and the preset temperature threshold value can be set to be 50 ℃ below zero under the condition.
the embodiment of the utility model provides a through gathering the temperature value of transmission medium in the gas supply system; temperature value with gathering contrasts with predetermineeing the temperature threshold value, judges according to the contrast result whether cavitation can appear in supercharging device to control according to the judged result supercharging device's switching, so that temperature environment among the gas supply system is difficult for making supercharging device cavitation appear, thereby the embodiment of the utility model provides a can reduce supercharging device cavitation's probability, avoid cavitation to cause destruction to supercharging device.
alternatively to this, the first and second parts may,
The step of collecting the temperature value of the transmission medium in the gas supply system comprises collecting the temperature value of the transmission medium in a return pipe of the supercharging device; comparing the acquired temperature value with a preset temperature threshold value, judging whether cavitation occurs in the supercharging device according to a comparison result, and controlling the supercharging device to be opened and closed according to a judgment result, wherein the comparison judgment comprises the steps of judging whether the temperature value of a transmission medium in the return air pipe is smaller than a first preset threshold value, if so, starting the supercharging device to supply air, and if not, pre-cooling the supercharging device;
And/or
The step of collecting the temperature value of the transmission medium in the gas supply system comprises collecting the temperature value of the transmission medium in an outlet pipe of the supercharging device; comparing the acquired temperature value with a preset temperature threshold value, judging whether cavitation occurs in the supercharging device according to a comparison result, and controlling the supercharging device to be opened and closed according to a judgment result, wherein the comparison judgment comprises the steps of judging whether the temperature value of a transmission medium in the outlet pipe is greater than a second preset threshold value, and if so, closing the supercharging device to stop air supply;
And/or
The step of collecting the temperature value of the transmission medium in the gas supply system comprises collecting the temperature value of the transmission medium in an inlet pipe of the supercharging device; and comparing the acquired temperature value with a preset temperature threshold value, judging whether cavitation can occur in the supercharging device according to a comparison result, controlling the supercharging device to be opened and closed according to a judgment result, judging whether the temperature value of the transmission medium in the inlet pipe is greater than a third preset threshold value or not by comparison, if so, leaking cold quantity in the supercharging device, and closing the supercharging device to stop air supply.
The temperature value of a transmission medium in an air return pipe of the supercharging device can be acquired through a first temperature sensor, and the first temperature sensor can be arranged in the air return pipe of the supercharging device; or the temperature value of the transmission medium in the outlet pipe of the supercharging device can be acquired through a second temperature sensor, and the second temperature sensor can be arranged in the outlet pipe of the supercharging device; or the temperature value of the transmission medium in the inlet pipe of the supercharging device can be acquired through a third temperature sensor, and the third temperature sensor can be arranged in the inlet pipe of the supercharging device.
Through gathering the temperature value of transmission medium in supercharging device's the return-air pipe, perhaps gather the temperature value of transmission medium in supercharging device's the exit pipe, perhaps gather the temperature value of transmission medium in supercharging device's the entry pipe can judge whether temperature environment in the gas supply system can lead to supercharging device to appear cavitation, controls through the temperature value of gathering supercharging device's operating condition, further reduces supercharging device and appears the probability of cavitation.
Optionally, before the temperature value of the transmission medium in the gas return pipe of the supercharging device is acquired, a precooling medium is introduced into the supercharging device through the inlet pipe of the supercharging device, and is discharged through the gas return pipe of the supercharging device, so as to form a precooling loop for precooling the supercharging device;
After the pre-cooling is finished, firstly, the pressure of the supercharging device is released for a preset time, and then the supercharging device is started.
wherein, a liquid inlet valve, an air return valve and a pressure release valve are arranged in the gas supply system. Specifically, the introducing of the precooling medium into the supercharging device may be to control the opening of the liquid inlet valve and the air return valve, and introduce liquid nitrogen into the supercharging device for precooling. The method comprises the steps of collecting a temperature value of a transmission medium in an air return pipe of the supercharging device, comparing and judging whether the temperature value of the transmission medium in the air return pipe is smaller than a first preset threshold value, if so, pre-cooling is completed, the decompression valve is controlled to be opened, and when the decompression valve is opened for a preset time, the decompression valve is closed and the supercharging device is started. The preset time period may be 10s, or 15s, and so on.
Preferably, the liquid booster pump is taken as an example of the boosting device, and pre-cooling is required before the liquid booster pump is started to boost pressure, in order to avoid that the liquid gas is vaporized due to too high temperature when flowing into the liquid booster pump, and the vaporized gas causes cavitation to the liquid booster pump when the liquid booster pump is boosted. By opening the liquid inlet valve and the gas return valve, liquid nitrogen flows through the liquid booster pump from the liquid inlet valve and then flows back to the storage tank from the gas return valve, and gas is discharged through the pressure release valve, so that precooling of the liquid booster pump can be realized.
The inlet pipe of the supercharging device is used for introducing the precooling medium into the supercharging device for precooling, so that the liquid gas is prevented from being vaporized due to overhigh temperature when flowing into the supercharging device, the vaporized gas can cause cavitation to the supercharging device when the supercharging device is supercharged, and the probability of cavitation of the supercharging device can be further reduced.
referring to fig. 2, an embodiment of the present invention provides a control system 5 for preventing cavitation of a supercharging device, which is applied to a gas supply system 1, the gas supply system 1 includes a supercharging device 3, and the control system 5 includes:
A temperature detection device 51 for collecting a temperature value of the transmission medium in the gas supply system 1;
And the control device 52 is connected with the temperature detection device 51 and the supercharging device 3, and is used for comparing the temperature value of the transmission medium detected by the temperature detection device 51 with a preset temperature threshold value, judging whether the supercharging device 3 generates cavitation according to the comparison result, and controlling the supercharging device 3 to be opened and closed according to the judgment result.
Wherein, gas supply system 1 can supply gas commonly used in workshop production processes such as nitrogen gas, the embodiment of the utility model provides an in order to supply gas to exemplify for nitrogen gas, when the nitrogen gas that is supplied with of gas supply system 1, transmission medium can be liquid nitrogen or nitrogen gas in the gas supply system 1, gathers the temperature value of transmission medium in the gas supply system 1, can be through the temperature sensor temperature value of liquid nitrogen and/or gaseous nitrogen in gathering gas supply system 1's the pipeline.
The preset temperature threshold may be a critical temperature value for determining whether cavitation occurs in the supercharging device 3. Specifically, the collected temperature value may be higher than a preset temperature threshold, and cavitation may occur in the supercharging device 3, in this case, when the comparison result shows that the collected temperature value is higher than the preset temperature threshold, the supercharging device 3 is turned off, otherwise, the supercharging device 3 is turned on; or the collected temperature value is lower than a preset temperature threshold value, cavitation may occur in the supercharging device 3, and in this case, when the collected temperature value is lower than the preset temperature threshold value as a comparison result, the supercharging device 3 is turned off, otherwise, the supercharging device 3 is turned on.
the embodiment of the utility model collects the temperature value of the transmission medium in the gas supply system 1 through the temperature detection device 51; compare the temperature value that will gather through controlling means 52 with predetermine the temperature threshold value, judge supercharging device 3 according to the contrast result whether can appear the cavitation to according to judged result control supercharging device 3's switching, so that the difficult cavitation that appears of temperature environment in the gaseous feed system 1, thereby the embodiment of the utility model discloses can reduce supercharging device 3 and appear the probability of cavitation, avoid the cavitation to cause destruction to supercharging device 3.
Alternatively, as shown in fig. 4, the temperature detection device 51 includes:
The first temperature sensor 14 is arranged on the air return pipe of the supercharging device 3 and is used for acquiring the temperature value of the transmission medium in the air return pipe of the supercharging device 3;
And/or
The second temperature sensor 15 is arranged on an outlet pipe of the supercharging device 3 and is used for acquiring the temperature value of the transmission medium in the outlet pipe of the supercharging device 3;
and/or
The third temperature sensor 16 is arranged on an inlet pipe of the supercharging device 3 and is used for acquiring the temperature value of the transmission medium in the inlet pipe of the supercharging device 3;
The control device 52 compares and judges whether the temperature value of the transmission medium in the return air pipe is smaller than a first preset threshold value, if so, the supercharging device 3 is started, and if not, the supercharging device 3 is precooled;
And/or
the control device 52 compares and judges whether the temperature value of the transmission medium in the outlet pipe is greater than a second preset threshold value, if so, the supercharging device 3 is closed;
and/or
the control device 52 compares and judges whether the temperature value of the transmission medium in the inlet pipe is larger than a third preset threshold value, if so, the cold quantity leakage exists in the supercharging device 3, and the supercharging device 3 is closed.
The temperature value acquired by the first temperature sensor 14 is used to determine whether the supercharging device 3 is precooled, and the condition for determining that the supercharging device 3 is precooled may be that the temperature value acquired by the first temperature sensor 14 is lower than a first preset threshold, for example, when the gas supplied by the gas supply system 1 is nitrogen, the condition for the supercharging device 3 is precooled is that the temperature value acquired by the first temperature sensor 14 is lower than-140 ℃. The temperature value collected by the second temperature sensor 15 is used to determine whether the pressure boosting device 3 operates in the cavitation state, and the condition for determining that the pressure boosting device 3 operates in the cavitation state may be that the temperature value collected by the second temperature sensor 15 is higher than a second preset threshold, for example, when the gas supplied by the gas supply system 1 is nitrogen, the pressure boosting device 3 operates in the cavitation state that the temperature value collected by the second temperature sensor 15 is higher than-120 ℃. The temperature value collected by the third temperature sensor 16 is used to judge whether the supercharging device 3 has cold leakage, and the condition for judging that the supercharging device 3 has cold leakage may be that the temperature value collected by the third temperature sensor 16 is higher than a third preset threshold, for example, when the gas supplied by the gas supply system 1 is nitrogen, the supercharging device 3 has cold leakage, and the temperature value collected by the third temperature sensor 16 is higher than-160 ℃.
The gas supply system 1 may be provided with the first temperature sensor 14, the second temperature sensor 15, and the third temperature sensor 16 at the same time, or may be provided with one or two of the first temperature sensor 14, the second temperature sensor 15, and the third temperature sensor 16.
as a specific embodiment, before the gas supply is started, the control device 52 first controls the storage tank 2 to supply gas to the pressure boosting device 3, so as to reduce the temperature of the pressure boosting device 3, thereby avoiding cavitation of the pressure boosting device 3 caused by a large temperature difference between the gas temperature and the pressure boosting device 3 when the gas supply is directly started to the pressure boosting device 3, the first temperature sensor 14 detects a first temperature value, when the detected temperature value is higher than a first preset threshold value, the gas supply is continued to the pressure boosting device 3, when the detected temperature value is smaller than the first preset threshold value, the control device 52 controls the pressure boosting device 3 to start the gas supply, during the gas supply process, the second temperature sensor 15 and the second temperature sensor 15 collect a second temperature value and a third temperature value, when the second temperature value is higher than a second preset threshold value, the pressure boosting device 3 will generate cavitation, at this time, or when the third temperature value is higher than a third preset threshold value, cavitation may also occur in the supercharging device 3, and the control device 52 may also shut down the supercharging device 3, and the entire air supply system may be serviced and maintained by personnel.
The temperature value of the transmission medium in the return air pipe of the supercharging device 3 is acquired through the first temperature sensor 14, the temperature value of the transmission medium in the outlet pipe of the supercharging device 3 is acquired through the second temperature sensor 15, the temperature value of the transmission medium in the inlet pipe of the supercharging device 3 is acquired through the third temperature sensor 16, whether cavitation of the supercharging device 3 occurs due to the temperature environment in the gas supply system 1 or not can be judged through the control device 52, the working state of the supercharging device 3 is controlled through the acquired temperature values, and the probability of cavitation of the supercharging device 3 is further reduced.
Referring to fig. 3, the embodiment of the present invention provides a gas supply system 1, which includes a storage tank 2, a pressure boosting device 3, a vaporizing device 4, and a control system 5 for preventing cavitation of the pressure boosting device according to the embodiment of the present invention,
A first air outlet and a first air return port are arranged on the storage tank 2, the first air outlet is connected with an inlet pipe of the supercharging device 3, and the first air return port is connected with an air return pipe of the supercharging device 3;
the vaporizing device 4 is in sealed communication with an outlet pipe of the pressurizing device 3 and is used for vaporizing the liquid gas flowing out through the pressurizing device 3 to obtain the gaseous gas.
wherein, gas supply system 1 can supply the gas commonly used in workshop production processes such as nitrogen gas, the embodiment of the utility model provides an use the supplied gas to exemplify for nitrogen gas. The storage tank 2 is used for storing liquid nitrogen, and in practical application, the storage tank 2 can be a liquid nitrogen low-pressure tank 7. The liquid nitrogen in the storage tank 2 can be obtained by filling the liquid nitrogen in the tank car into the storage tank 2 through a tank car filling pump, and the pressure in the storage tank 2 can be maintained at a set pressure value through a pressure control system arranged on the storage tank 2.
as shown in fig. 4, the pressure increasing device 3 may be a liquid pressure increasing pump, and specifically, may be a liquid nitrogen pump 8. It should be noted that, in order to prevent failure and facilitate maintenance, one or more liquid booster pumps may be provided for backup.
The vaporizing device 4 may be the vaporizer 9, or may be an evaporator, etc., which is not limited in the embodiments of the present invention. In order to prevent malfunction and facilitate maintenance, one or more vaporizing devices 4 may be provided for backup.
The embodiment of the utility model provides a gas supply system 1, including the control system 5 who prevents supercharging device cavitation, can reduce supercharging device 3 probability that cavitation appears, avoid cavitation to cause destruction to supercharging device 3.
Optionally, as shown in fig. 4, the supercharging device 3 includes a main supercharging device and a backup supercharging device, the main supercharging device and the backup supercharging device have the same structure, and the main supercharging device and the backup supercharging device are connected in parallel.
the input end of the main supercharging device is connected with the input end of the backup supercharging device, and the output end of the main supercharging device is connected with the output end of the backup supercharging device.
When using, first-selected main supercharging device that adopts carries out the pressure boost to the liquid gas who comes out from storage tank 2, when main supercharging device broke down, adopts backup supercharging device to carry out the pressure boost to the liquid gas who comes out from storage tank 2, through setting up main supercharging device and backup supercharging device, can prevent supercharging device 3 trouble and make things convenient for supercharging device 3's maintenance.
Optionally, as shown in fig. 4, the main supercharging device and the backup supercharging device both include a liquid booster pump, the inlet pipe is provided with a liquid inlet valve 18, the gas return pipe is provided with a gas return valve 17, the outlet pipe is provided with a pressure release valve 19, the control device 52 may be a control cabinet 6, and the control device 52 is connected with the liquid inlet valve 18, the gas return valve 17 and the pressure release valve 19, and is used for controlling the opening and closing of the liquid inlet valve 18, the gas return valve 17 and the pressure release valve 19.
Note that, in order to avoid vaporization of the liquid nitrogen due to an excessively high temperature when the liquid nitrogen flows into the liquid booster pump, pre-cooling is required before the liquid booster pump is started to boost the pressure. By opening the liquid inlet valve 18 and the gas return valve 17, liquid nitrogen flows through the liquid booster pump from the liquid inlet valve 18 and then flows back to the storage tank 2 from the gas return valve 17, and gas is discharged through the pressure release valve 19, so that precooling of the liquid booster pump can be realized.
Wherein, the inlet pipe and the muffler of liquid booster pump are connected with storage tank 2 respectively, and the outlet pipe of liquid booster pump is connected with vaporizer 4, and first temperature sensor 14 sets up on the muffler of liquid booster pump, and second temperature sensor 15 sets up on the outlet pipe of liquid booster pump, and third temperature sensor 16 sets up on the inlet pipe of liquid booster pump.
Specifically, the third temperature sensor 16 can be arranged at the joint of the driving end and the cold end of the liquid booster pump, and the temperature value acquired by the third temperature sensor 16 can be used for judging whether a large amount of cold energy caused by the sealing abrasion of the piston rod leaks.
Optionally, as shown in fig. 4, the gas supply system 1 further includes a fourth temperature sensor 23, the vaporizing device 4 is connected to the outlet pipe of the pressure boosting device 3, and the fourth temperature sensor 23 is disposed on the outlet pipe of the vaporizing device 4 and is used for collecting a gas temperature value output from the vaporizing device 4; the control device 52 may be the control cabinet 6, and the control device 52 is connected to the fourth temperature sensor 23, and is configured to compare and determine whether the gas temperature value output from the vaporizing device 4 is smaller than a sixth preset threshold, and if so, the control device 52 controls the pressure boosting device 3 to be turned off.
The working state of the supercharging device 3 is controlled by the temperature value acquired by the fourth temperature sensor 23, which is beneficial to the fault maintenance inside the gas supply system 1 and the control of the working state of the gas supply system 1.
Optionally, as shown in fig. 4, the gas supply system 1 further includes a first pressure sensor 20 disposed on the outlet pipe of the pressure boosting device 3, the first pressure sensor 20 is connected to the control device 52, and the first pressure sensor 20 is configured to collect a pressure value of the transmission medium in the outlet pipe of the pressure boosting device 3;
the control device 52 is configured to determine a magnitude relationship between a pressure value of the transmission medium in the outlet pipe of the pressure boosting device 3 and a fourth preset threshold and a fifth preset threshold, when a gas pressure value of the outlet pipe is greater than the fifth preset threshold, the control device 52 controls the pressure boosting device 3 to close, so that a gas pressure value in the outlet pipe of the pressure boosting device 3 is reduced, and when the gas pressure value of the outlet pipe of the pressure boosting device 3 is reduced to be smaller than the fourth preset threshold, the control device 52 controls the pressure boosting device 3 to start; the fourth preset threshold is smaller than the fifth preset threshold.
Through setting up first pressure sensor 20, utilize the pressure value of first pressure sensor 20 collection to realize supercharging device 3's self-starting, the automated control of being convenient for. Meanwhile, the start-stop pressure of the supercharging device 3 is adjustable through setting a fifth preset threshold and a sixth preset threshold.
Alternatively, as shown in fig. 4, the gas supply system 1 further includes: and the pressure regulating device is communicated with the outlet end of the vaporizing device 4 in a sealing way and is used for regulating the pressure of the gaseous gas.
Through setting up the pressure regulating device, can adjust the pressure value of actual demand with gaseous pressure.
Optionally, as shown in fig. 4, the voltage regulating device includes a main voltage regulating device and a backup voltage regulating device, the main voltage regulating device and the backup voltage regulating device have the same structure, and the main voltage regulating device and the backup voltage regulating device are connected in parallel.
The input end of the main voltage regulating device is connected with the input end of the backup voltage regulating device, and the output end of the main voltage regulating device is connected with the output end of the backup voltage regulating device.
Through setting up main pressure regulating device and backup pressure regulating device, can prevent pressure regulating device trouble and make things convenient for pressure regulating device's maintenance.
Optionally, as shown in fig. 4, a filter 25 is disposed on the pressure regulating device.
Specifically, the main pressure regulating device and the backup pressure regulating device are both provided with filters 25, and the filters 25 can be precision filters, so that impurities are not doped in the gas.
optionally, as shown in fig. 4, the gas supply system 1 further includes a gas output pipe 12, the gas output pipe 12 is in sealed communication with the outlet end of the pressure regulating device for outputting gas, and a flow meter 26 and/or a second pressure sensor 21 are disposed on the gas output pipe 12.
By installing the flow meter 26 and/or the second pressure sensor 21 in the gas output pipe 12, the flow rate and/or the pressure of the gas can be checked in real time, so that the gas output can be adjusted in real time.
Optionally, as shown in fig. 4, the gas supply system 1 further includes a high-pressure buffer device for buffering the gas, and the high-pressure buffer device is in sealed communication with the vaporizing device 4.
In this embodiment, the high-pressure buffer device is connected between the vaporizing device 4 and the pressure regulating device, and can be connected in series on the gas transmission pipeline between the vaporizing device 4 and the pressure regulating device, and also can be connected in parallel on the gas transmission pipeline between the vaporizing device 4 and the pressure regulating device, the gas coming out of the vaporizing device 4 can enter the high-pressure buffer device for buffering, and also can directly enter the pressure regulating device, and the transmission path of the gas transmitted from the vaporizing device 4 to the pressure regulating device is switched by arranging a valve on the gas transmission pipeline.
Through high-pressure buffer, the guarantee can realize in the short time that the large-scale gas is used, provides the gas of steady pressure and flow, simultaneously, can reduce supercharging device 3's operating time and open and stop the number of times.
alternatively, as shown in fig. 4, the high pressure buffer device is a high pressure buffer tank 10.
optionally, as shown in fig. 4, the vaporizing device 4 includes a main vaporizing device and a backup vaporizing device, the main vaporizing device and the backup vaporizing device have the same structure, and the main vaporizing device and the backup vaporizing device are connected in parallel.
Optionally, as shown in fig. 4, a third pressure sensor 22 is further disposed on the outlet pipe of the vaporizing device 4, and the third pressure sensor 22 is configured to acquire a pressure value on the outlet pipe of the vaporizing device 4.
Optionally, as shown in fig. 4, a safety valve 13 is disposed in the transmission pipeline of the gas supply system 1, and when the pressure value of the transmitted liquid gas and/or gaseous gas in the transmission pipeline reaches a preset limit pressure value, the safety valve 13 can implement pressure relief.
The gas supply system of the present invention is illustrated in a specific embodiment below:
As shown in fig. 4, the gas supply system 1 is a nitrogen gas supply system, and the nitrogen gas supply system can provide nitrogen gas for a workshop, as shown in fig. 2, the nitrogen gas supply system includes a control cabinet 6, a liquid nitrogen low-pressure tank 7, a liquid nitrogen pump 8, a vaporizer 9, a high-pressure buffer tank 10, a pressure regulating valve set 11 and a gas output pipe 12, the liquid nitrogen pump 8 includes a main liquid nitrogen pump and a backup liquid nitrogen pump, the vaporizer 9 includes a main vaporizer and a backup vaporizer, the pressure regulating valve set 11 includes a pressure reducing valve 24, and the pressure reducing valve 24 includes a main pressure reducing valve and a backup pressure reducing valve. Liquid nitrogen is exported to liquid nitrogen low pressure jar 7, and liquid nitrogen pump 8 carries out the pressure boost to the liquid nitrogen of liquid nitrogen low pressure jar 7 output, and the liquid nitrogen after will the pressure boost transmits to vaporizer 9, and vaporizer 9 vaporizes the liquid nitrogen for nitrogen gas to carry to high-pressure buffer tank 10 and store, when the workshop needs nitrogen gas, high-pressure buffer tank 10 carries nitrogen gas to the regulator, and nitrogen gas exports for the workshop through gas output tube 12 after the pressure regulating of pressure regulating valves 11. A first temperature sensor 14 is arranged on an air return pipe of the liquid nitrogen pump 8, a second temperature sensor 15 is arranged on an outlet pipe of the liquid nitrogen pump 8, and a third temperature sensor 16 is arranged at the joint of the pump driving end and the cold end of the liquid nitrogen pump 8. Meanwhile, a liquid inlet valve 18 is arranged on an inlet pipe of the liquid nitrogen pump 8, an air return valve 17 is arranged on an air return pipe, a pressure release valve 19 is arranged on an outlet pipe, and the liquid inlet valve 18, the air return valve 17 and the pressure release valve 19 are used for pre-cooling the liquid nitrogen pump 8. The outlet pipe of the liquid nitrogen pump 8 is also provided with a first pressure sensor 20. A fourth temperature sensor 23 is provided on the outlet pipe of the vaporizer 9. The gas outlet pipe 12 is provided with a flow meter 26 and a second pressure sensor 21. The pressure regulating valve group 11 is provided with a filter 25, and the filter 25 comprises a main filter and a backup filter. The nitrogen gas supply system is also provided with a first valve 27, a one-way valve 28, an exhaust valve 29, a metal hose 30, a heat preservation device 31, a three-way valve 32, a second valve 33 and a flange 34. The first valve 27 is used for controlling whether liquid nitrogen or gaseous nitrogen is allowed to flow in the pipeline when the nitrogen supply system works; the one-way valve 28 is used for controlling the one-way circulation of liquid nitrogen or gaseous nitrogen in the pipeline; the exhaust valve 29 is used for controlling exhaust of the pipeline; the metal hose 30 is used for connecting a liquid nitrogen pump, so that shock absorption is facilitated; the heat preservation device 31 is used for preserving heat of the pipeline to avoid vaporization of liquid nitrogen; the three-way valve 32 is used for communicating the nitrogen supply system with other devices; the second valve 33 is used for controlling the conduction and the stop of the pipeline when the nitrogen supply system is overhauled; the flange 34 is used to connect components in the nitrogen supply system.
The control cabinet 6 controls the working state of the liquid nitrogen pump 8 specifically including:
the control cabinet 6 receives the temperature values collected by the first temperature sensor 14, the second temperature sensor 15 and the third temperature sensor 16 and the pressure value collected by the first pressure sensor 20. The control cabinet 6 controls the opening of the liquid inlet valve 18 and the gas return valve 17, and liquid nitrogen flows in from the liquid inlet valve 18, flows out through the gas return valve 17 and returns to the liquid nitrogen low-pressure tank 7. The control cabinet 6 judges whether the temperature value acquired by the first temperature sensor 14 is smaller than a first preset threshold value, if so, the pressure release valve 19 is controlled to be opened, and after the pressure release valve 19 is opened for 10s, the pressure release valve 19 is closed and the liquid nitrogen pump 8 is started. If the precooling exceeds a certain time, the temperature value acquired by the first temperature sensor 14 is always smaller than a first preset threshold value, and a precooling error alarm can be sent out. After the liquid nitrogen pump 8 is started, whether the pressure value acquired by the first pressure sensor 20 is greater than a fifth preset threshold value or not is judged, if yes, the liquid nitrogen pump 8 is stopped, meanwhile, whether the pressure value acquired by the first pressure sensor 20 is smaller than a fourth preset threshold value or not is judged, if yes, the liquid nitrogen pump 8 is started, and the fourth preset threshold value is smaller than the fifth preset threshold value. The control cabinet 6 judges whether the temperature value acquired by the second temperature sensor 15 is greater than a second preset threshold value, and if the temperature value acquired by the second temperature sensor 15 is greater than the second preset threshold value and exceeds a set time, the liquid nitrogen pump 8 is stopped and a cavitation alarm is sent out. And the control cabinet 6 judges whether the temperature value acquired by the third temperature sensor 16 is greater than a third preset threshold value, and if so, the alarm device is started to remind a user to stop the liquid nitrogen pump 8 for maintenance.
The control cabinet 6 controls the working state of the vaporizer 9, which specifically includes:
the control cabinet 6 receives the temperature value acquired by the fourth temperature sensor 23, judges whether the temperature value acquired by the fourth temperature sensor 23 is smaller than a sixth preset threshold value, and if so, sends an alarm that the temperature of the vaporizer 9 is low and stops the liquid nitrogen pump 8.
The control cabinet 6 includes a PLC (Programmable Logic Controller) control system, has a network communication function, and can be incorporated into a plant monitoring system to realize remote monitoring. The control cabinet 6 comprises a control panel, the control panel can realize a display function and receive an operation instruction generated by user operation, and the control panel can be a teaching box, a tablet personal computer and the like.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
In the description of the present invention, it is to be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and to simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
in the description of the present invention, it is to be noted that the terms "mounted", "disposed" and "connected" are to be construed broadly unless otherwise explicitly stated or limited. For example, the connection can be fixed, detachable or integrated; may be directly connected or indirectly connected through an intermediate. The fixed connection can be common technical schemes such as welding, threaded connection and clamping. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
the above embodiments are only specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention, and all should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A control system for preventing cavitation of a supercharging device, applied to a gas supply system including a supercharging device, characterized in that the control system comprises:
The temperature detection device is used for collecting the temperature value of the transmission medium in the gas supply system;
And the control device is connected with the temperature detection device and the supercharging device and used for comparing the temperature value of the transmission medium detected by the temperature detection device with a preset temperature threshold value, judging whether the supercharging device can generate cavitation according to the comparison result and controlling the supercharging device to be opened and closed according to the judgment result.
2. The control system according to claim 1, wherein the temperature detection means includes:
the first temperature sensor is arranged on an air return pipe of the supercharging device and used for acquiring the temperature value of a transmission medium in the air return pipe of the supercharging device;
And/or
the second temperature sensor is arranged on an outlet pipe of the pressurizing device and is used for acquiring the temperature value of the transmission medium in the outlet pipe of the pressurizing device;
And/or
the third temperature sensor is arranged on an inlet pipe of the supercharging device and is used for acquiring the temperature value of the transmission medium in the inlet pipe of the supercharging device;
The control device compares and judges whether the temperature value of the transmission medium in the return air pipe is smaller than a first preset threshold value, if so, the supercharging device is started, and if not, the supercharging device is precooled;
And/or
The control device compares and judges whether the temperature value of the transmission medium in the outlet pipe is greater than a second preset threshold value, and if so, the supercharging device is closed;
And/or
and the control device compares and judges whether the temperature value of the transmission medium in the inlet pipe is greater than a third preset threshold value, if so, the cold quantity leakage exists in the supercharging device, and the supercharging device is closed.
3. a gas supply system comprising a storage tank, a pressure boosting device, a vaporization device, and the control system for preventing cavitation of the pressure boosting device according to any one of claims 1 to 2,
A first air outlet and a first air return port are arranged on the storage tank, the first air outlet is connected with an inlet pipe of the supercharging device, and the first air return port is connected with an air return pipe of the supercharging device;
the vaporizing device is in sealed communication with an outlet pipe of the pressurizing device and is used for vaporizing the liquid gas flowing out of the pressurizing device to obtain gaseous gas.
4. The gas supply system according to claim 3, wherein the pressure boosting device comprises a main pressure boosting device and a backup pressure boosting device, the main pressure boosting device and the backup pressure boosting device are identical in structure, and the main pressure boosting device and the backup pressure boosting device are connected in parallel.
5. The gas supply system according to claim 4, wherein the main pressurizing device and the backup pressurizing device each comprise a liquid pressurizing pump, the inlet pipe is provided with a liquid inlet valve, the gas return pipe is provided with a gas return valve, the outlet pipe is provided with a pressure release valve, and the control device is connected with the liquid inlet valve, the gas return valve and the pressure release valve and used for controlling the opening and closing of the liquid inlet valve, the gas return valve and the pressure release valve.
6. the gas supply system according to claim 3, further comprising a fourth temperature sensor disposed on the gas outlet pipe of the vaporizing device for collecting a gas temperature value output from the vaporizing device; the control device is connected with the fourth temperature sensor and used for comparing and judging whether the gas temperature value output from the vaporizing device is smaller than a sixth preset threshold value or not, and if yes, the control device controls the pressurizing device to be closed.
7. the gas supply system according to claim 3, further comprising a first pressure sensor disposed on the outlet pipe of the pressure boosting device, wherein the first pressure sensor is connected to the control device, and is configured to acquire a pressure value of the transmission medium in the outlet pipe of the pressure boosting device;
The control device is used for judging the magnitude relation between the pressure value of the transmission medium in the outlet pipe of the supercharging device and a fourth preset threshold value and a fifth preset threshold value, when the gas pressure value of the outlet pipe is larger than the fifth preset threshold value, the control device controls the supercharging device to be closed, so that the gas pressure value in the outlet pipe of the supercharging device is reduced, and when the gas pressure value of the outlet pipe of the supercharging device is reduced to be smaller than the fourth preset threshold value, the control device controls the supercharging device to be started; the fourth preset threshold is smaller than the fifth preset threshold.
8. the gas supply system according to claim 3, further comprising: the pressure regulating device is communicated with the outlet end of the vaporizing device in a sealing mode and used for regulating the pressure of the gaseous gas, and a filter is arranged on the pressure regulating device.
9. The gas supply system according to claim 8, further comprising a gas outlet pipe in sealed communication with the outlet end of the pressure regulating device for gas output, wherein a flow meter and/or a second pressure sensor is disposed on the gas outlet pipe.
10. The gas supply system of claim 3, further comprising a high pressure buffer for buffering gas, the high pressure buffer being in sealed communication with the vaporizing device.
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| CN201822071981.5U CN209801147U (en) | 2018-12-11 | 2018-12-11 | control system for preventing cavitation of supercharging device and gas supply system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114046441A (en) * | 2021-10-29 | 2022-02-15 | 济南华信流体控制有限公司 | Automatic pressurization system of low temperature liquefied gas |
| CN114110416A (en) * | 2021-10-29 | 2022-03-01 | 济南华信流体控制有限公司 | Automatic pressurization system for low-temperature liquefied carbon dioxide |
| CN115823482A (en) * | 2023-02-15 | 2023-03-21 | 济南华信流体控制有限公司 | Pipeline system filled with gas |
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2018
- 2018-12-11 CN CN201822071981.5U patent/CN209801147U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114046441A (en) * | 2021-10-29 | 2022-02-15 | 济南华信流体控制有限公司 | Automatic pressurization system of low temperature liquefied gas |
| CN114110416A (en) * | 2021-10-29 | 2022-03-01 | 济南华信流体控制有限公司 | Automatic pressurization system for low-temperature liquefied carbon dioxide |
| CN114046441B (en) * | 2021-10-29 | 2023-08-15 | 济南华信流体控制有限公司 | Automatic pressurization system for low-temperature liquefied gas |
| CN115823482A (en) * | 2023-02-15 | 2023-03-21 | 济南华信流体控制有限公司 | Pipeline system filled with gas |
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