CN111911807A - Small-sized oxygen generator and flow control device and method thereof - Google Patents
Small-sized oxygen generator and flow control device and method thereof Download PDFInfo
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- CN111911807A CN111911807A CN202010864315.6A CN202010864315A CN111911807A CN 111911807 A CN111911807 A CN 111911807A CN 202010864315 A CN202010864315 A CN 202010864315A CN 111911807 A CN111911807 A CN 111911807A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B13/00—Oxygen; Ozone; Oxides or hydroxides in general
- C01B13/02—Preparation of oxygen
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/18—Arrangements for supervising or controlling working operations for measuring the quantity of conveyed product
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Abstract
The invention discloses a flow control device of a small oxygen generator, which comprises: the first flow control branch is connected with the gas storage tank of the oxygen generator and comprises a first pressure reducing valve and a first electric control flow regulating valve which are sequentially connected; the second flow control branch is connected with the gas storage tank of the oxygen generator and comprises a second pressure reducing valve and a second electric control flow regulating valve which are sequentially connected, and the outlet pressure of the second pressure reducing valve is greater than the outlet pressure of the first pressure reducing valve; the oxygen flow sensor is arranged at the output ends of the first electric control flow regulating valve and the second electric control flow regulating valve so as to collect the real-time oxygen output flow of the oxygen generator; and the control circuit is connected with the first electric control flow regulating valve, the second electric control flow regulating valve and the oxygen flow sensor so as to regulate the opening degree of the first electric control flow regulating valve or the second electric control flow regulating valve according to the target oxygen supply amount and the oxygen outlet flow from the oxygen flow sensor. Also discloses a small-sized oxygen generator and a flow control method thereof.
Description
Technical Field
The invention relates to the field of oxygen generation equipment, in particular to a small oxygen generator and a flow control device and method thereof.
Background
The molecular sieve oxygen generator is an oxygen generator which uses pressure-variable adsorption principle to separate oxygen from air, and is a small-sized oxygen generator which uses compressor to compress air, then the compressed air is passed through scavenging valve and fed into adsorption tower equipped with molecular sieve to make oxygen by adsorption-desorption circulation. In recent years, the small oxygen generator has great improvement in the aspects of technology such as volume reduction, weight reduction, noise reduction and the like, is better applied to household oxygen therapy, becomes the most convenient and feasible method for comprehensively preventing and treating chronic diseases of a respiratory system, and has excellent effects of relieving the state of illness, promoting rehabilitation, improving sub-health state and the like.
At present, a small oxygen generator generally detects actual output flow of an electronic control flow regulating valve through an ultrasonic oxygen concentration flow detection device and a flow controller, and performs closed-loop flow control, and a flow control method of an existing electronic control flow regulating valve generally includes: firstly, calibrating a flow valve, generating a flow rate-stepping data table, storing a flow rate value and a stepping value in the flow rate-stepping data table into a memory, inquiring the flow rate-stepping data table according to a set target flow rate value, finding out a flow rate value with the minimum absolute difference value with the target flow rate value and a stepping value corresponding to the flow rate value in the flow rate-stepping data table, driving a stepping motor to adjust the opening degree of a needle valve by the stepping value, enabling the actual flow rate value flowing through the needle valve to be equal to the set value of an initial flow rate-stepping data table, and finally, gradually approximating the actual flow rate value by adopting a closed-loop control mode, so that the actual flow rate value is equal to the set target flow rate value; however, the valve core profile design of the electric control flow regulating valve cannot meet the linearity in the full range, and particularly when the target oxygen flow value is set to be a small value, the valve is in a small-opening working state, the flow response is too sensitive, the relative change value of the flow is too large, and overshoot is easily generated to cause oscillation, so that the closed-loop flow control is unstable.
Disclosure of Invention
The invention aims to provide a small oxygen generator capable of improving flow control stability, a flow control device and a flow control method thereof.
In order to solve the above technical problems, according to an aspect of the present invention, there is provided a flow control device for a small oxygen generator, comprising:
the first flow control branch is connected with the gas storage tank of the oxygen generator and comprises a first pressure reducing valve and a first electric control flow regulating valve which are sequentially connected;
the second flow control branch is connected with the gas storage tank of the oxygen generator and comprises a second pressure reducing valve and a second electric control flow regulating valve which are sequentially connected, and the outlet pressure of the second pressure reducing valve is greater than the outlet pressure of the first pressure reducing valve;
the oxygen flow sensor is arranged at the output ends of the first electric control flow regulating valve and the second electric control flow regulating valve so as to collect the real-time oxygen output flow of the oxygen generator;
and the control circuit is connected with the first electric control flow regulating valve, the second electric control flow regulating valve and the oxygen flow sensor so as to regulate the opening degree of the first electric control flow regulating valve or the second electric control flow regulating valve according to the target oxygen supply amount and the oxygen outlet flow from the oxygen flow sensor.
The further technical scheme is as follows: first automatically controlled flow control valve and second automatically controlled flow control valve structure are the same, first automatically controlled flow control valve includes:
the air inlet of the valve body is connected with the output end of the first pressure reducing valve, and the air outlet of the valve body is connected with the oxygen flow sensor;
the valve core is arranged in the valve body and used for adjusting the oxygen flow through self rotation;
and the stepping motor is arranged on the valve body and is respectively connected with the valve core and the control circuit so as to control the rotation of the valve core according to the instruction of the control circuit.
The further technical scheme is as follows: the control circuit includes:
the motor driving circuit is connected with the stepping motors of the first electric control flow regulating valve and the second electric control flow regulating valve so as to regulate the opening degree of the first electric control flow regulating valve or the second electric control flow regulating valve;
and the microprocessor is connected with the motor driving circuit and the oxygen flow sensor so as to obtain the number of the stepping value pulses of the stepping motor corresponding to the target oxygen supply amount according to the target oxygen supply amount, output a stepping value pulse instruction to the motor driving circuit so as to drive the corresponding stepping motor, and adjust the oxygen flow output by the oxygen generator to the target oxygen supply amount according to the oxygen output flow from the oxygen flow sensor.
The further technical scheme is as follows: the outlet pressure value of the first pressure reducing valve is 5-20 kPa.
The further technical scheme is as follows: the outlet pressure value of the second pressure reducing valve is 30-70 kPa.
In order to solve the technical problem, according to another aspect of the present invention, a small oxygen generator is provided, which comprises a compressor, a molecular sieve adsorption tower, a gas storage tank, and a flow control device of the small oxygen generator, wherein the compressor, the molecular sieve adsorption tower, the gas storage tank are sequentially connected through a pipeline, an oxygen outlet end of the gas storage tank is connected with a gas pipeline, and the flow control device is connected between the oxygen outlet end of the gas storage tank and the gas pipeline to adjust an oxygen flow output by the oxygen generator.
In order to solve the technical problem, according to another aspect of the present invention, there is provided a flow control method for a small oxygen generator, comprising:
the control circuit determines whether a first flow control branch or a second flow control branch connected with the gas storage tank is conducted according to the set target oxygen supply amount; the first flow control branch comprises a first pressure reducing valve and a first electric control flow regulating valve which are sequentially connected, the second flow control branch comprises a second pressure reducing valve and a second electric control flow regulating valve which are sequentially connected, and the outlet pressure of the second pressure reducing valve is greater than the outlet pressure of the first pressure reducing valve;
obtaining the number of step value pulses corresponding to the target oxygen supply amount by adopting a linear interpolation algorithm according to the flow control branch which is determined to be conducted;
the control circuit adjusts the opening of an electric control flow adjusting valve in the corresponding flow control branch according to the obtained step value pulse number so as to initially adjust the oxygen flow output by the oxygen generator;
and finely adjusting the oxygen flow output by the oxygen generator according to the oxygen output flow acquired by the oxygen flow sensor so as to ensure that the oxygen flow output by the oxygen generator is the target oxygen supply amount.
The further technical scheme is as follows: the method for obtaining the number of the stepping value pulses corresponding to the target oxygen supply amount by adopting a linear interpolation algorithm according to the determined conducted flow control branch specifically comprises the following steps:
if the first flow control branch is determined to be conducted, according to a formula
Calculating to obtain a target oxygen supply amount VtargetNumber of corresponding step value pulses ftargetWherein V issmallFor the first flow control branch full scale flow value, fsmallIs a VsmallThe corresponding number of step value pulses.
The further technical scheme is as follows: the method for obtaining the number of the stepping value pulses corresponding to the target oxygen supply amount by adopting a linear interpolation algorithm according to the determined conducted flow control branch specifically comprises the following steps:
if the second flow control branch is determined to be conducted, according to the formula
Calculating to obtain a target oxygen supply amount VtargetNumber of corresponding step value pulses ftargetWherein V isminFor the second flow control branch range lower limit flow value, fminIs a VminNumber of corresponding step value pulses, VmaxFor the second flow control branch full scale flow value, fmaxIs a VmaxThe corresponding number of step value pulses.
The invention has the beneficial technical effects that: the small-sized oxygen generator flow control device is provided with a large-flow range control branch and a small-flow range control branch, namely a first flow control branch and a second flow control branch, the outlet pressure of a second reducing valve is greater than the outlet pressure of a first reducing valve, so that the control branches in corresponding flow ranges are conducted according to oxygen supply requirements of users, unstable states such as system overshoot or oscillation and the like caused by mismatching of flow coefficient values when a valve core is in a small opening degree can be avoided in the large-flow range control range, the valve port pressure difference is low in the small-flow range control range, and the flow response sensitivity can be reduced when the valve core is in a small opening degree, so that the flow control stability is improved.
Drawings
Fig. 1 is a schematic structural view of a flow control device of a small-sized oxygen generator according to an embodiment of the present invention.
Fig. 2 is a schematic flow chart of a flow control method of a small-sized oxygen generator according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood by those skilled in the art, the present invention is further described with reference to the accompanying drawings and examples.
Referring to fig. 1, fig. 1 is a schematic structural view of a flow control device of a small-sized oxygen generator according to an embodiment of the present invention. In the embodiment shown in the attached drawings, the flow control device of the small oxygen generator comprises: the system comprises a first flow control branch 10, a second flow control branch 20, an oxygen flow sensor 30 and a control circuit 40, wherein the first flow control branch 10 is connected with an oxygen storage tank of an oxygen generator and comprises a first reducing valve 101 and a first electric control flow regulating valve 102 which are sequentially connected; the second flow control branch 20 is connected with an air storage tank of the oxygen generator and comprises a second pressure reducing valve 201 and a second electric control flow regulating valve 202 which are sequentially connected, and the outlet pressure of the second pressure reducing valve 201 is greater than the outlet pressure of the first pressure reducing valve 101; the oxygen flow sensor 30 is installed at the output ends of the first electric control flow regulating valve 102 and the second electric control flow regulating valve 202 to collect the real-time oxygen output flow of the oxygen generator; the control circuit 40 is connected to the first electrically controlled flow regulating valve 102, the second electrically controlled flow regulating valve 202, and the oxygen flow sensor 30, so as to regulate the opening degree of the first electrically controlled flow regulating valve 102 or the second electrically controlled flow regulating valve 202 according to the target oxygen supply amount and the oxygen output flow from the oxygen flow sensor 30. Preferably, in this embodiment, the outlet pressure value of the first pressure reducing valve 101 is 5 to 20kPa, and the outlet pressure value of the second pressure reducing valve 201 is 30 to 70 kPa.
It can be known that the flow control device of the small oxygen generator of the present invention is provided with a large flow range control branch and a small flow range control branch, that is, a first flow control branch 10 and a second flow control branch 20 are provided, and the outlet pressure of the second pressure reducing valve 201 is greater than the outlet pressure of the first pressure reducing valve 101, so as to turn on the control branch of the corresponding flow range according to the oxygen supply requirement of the user, and the other control branch is turned off by the electrically controlled flow regulating valve therein.
In this embodiment, when the second flow control branch 20 is turned on, the outlet pressure of the second pressure reducing valve 201 is a large value, so as to set the flow to be a large flow range control range, and at the same time, the opening of the valve port of the electrically controlled flow control valve is located above 10% (approximately to be a linear control region), thereby avoiding unstable states such as system overshoot or oscillation caused by the mismatch of the flow coefficient value when the valve core is small in opening.
When the first flow control branch 10 is conducted, the outlet pressure of the first pressure reducing valve 101 is a small value to set the flow of the oxygen generator to be a small flow range control range, and the electric control flow regulating valve is regarded as a throttle valve, and the flow coefficient of the electric control flow regulating valve is the flow coefficient
Wherein q isVThe valve port flow is shown, Δ p is the valve port pressure difference, A is the valve port flow area, and ρ is the fluid density. In this embodiment, the flow rate of the oxygen generator is in a small range, the opening degree A of the valve port is kept at a fixed value, the pressure difference Δ p of the valve port is reduced, and the control flow rate is small (q)VSmaller), the flow coefficient at the moment is similar to the flow coefficient when the valve port opening degree is equal to that of the large-flow range control range, so that the relative flow control error of the system in the small-flow range control range is consistent with that in the large-flow range control range; because when the valve core is positioned at a smaller opening degree, the flow coefficient CdThe valve is large, the flow response is too sensitive, the relative change value of the flow is too large, overshoot is easily generated to cause oscillation to cause unstable closed-loop flow control, and in the embodiment, when the oxygen generator is in a small-flow range control range, the valve port pressure difference delta p is low, and the valve core is in a small opening degree, so that the flow response sensitivity can be reducedThereby improving the flow control stability.
In some embodiments, the first electrically controlled flow regulating valve 102 and the second electrically controlled flow regulating valve 202 have the same structure, the first electrically controlled flow regulating valve 102 includes a valve body, a valve core and a stepping motor, the air inlet of the valve body is connected to the output end of the first pressure reducing valve 101, and the air outlet is connected to the oxygen flow sensor 30; the valve core is arranged in the valve body and used for adjusting the oxygen flow through self rotation; the stepping motor is arranged on the valve body and is respectively connected with the valve core and the control circuit 40 so as to control the valve core to rotate according to the instruction of the control circuit 40. Understandably, the valve body air inlet of the second electrically controlled flow regulating valve 202 is connected with the output end of the second pressure reducing valve 201.
In this embodiment, the control circuit 40 includes a motor driving circuit and a microprocessor, and the motor driving circuit is connected to the stepping motors of the first electrically controlled flow regulating valve 102 and the second electrically controlled flow regulating valve 202 to adjust the opening degree of the first electrically controlled flow regulating valve 102 or the second electrically controlled flow regulating valve 202; the microprocessor is connected with the motor driving circuit and the oxygen flow sensor 30 so as to obtain the number of stepping value pulses of the stepping motor corresponding to the target oxygen supply amount according to the target oxygen supply amount, output a stepping value pulse instruction to the motor driving circuit so as to drive the corresponding stepping motor, and adjust the oxygen flow output by the oxygen generator to the target oxygen supply amount according to the oxygen output flow from the oxygen flow sensor 30; namely, whether the first flow control branch 10 or the second flow control branch 20 is conducted is determined according to the target oxygen supply amount, then the number of step value pulses corresponding to the target oxygen supply amount is obtained, and a step value pulse instruction is output to a motor driving circuit to drive a step motor of the first flow control branch 10 or the second flow control branch 20 so as to control the valve core to rotate, thereby adjusting the output oxygen flow.
Referring to fig. 2, fig. 2 is a schematic flow chart of a flow control method of a small oxygen generator according to an embodiment of the present invention. In the embodiment shown in the attached drawings, the flow control method of the small oxygen generator comprises the following steps:
s101, the control circuit supplies oxygen according to the set target oxygen supply amount VtargetDeterminingAnd the first flow control branch or the second flow control branch connected with the gas storage tank is conducted.
In this embodiment, the first flow control branch comprises a first pressure reducing valve and a first electric control flow regulating valve which are connected in sequence, the second flow control branch comprises a second pressure reducing valve and a second electric control flow regulating valve which are connected in sequence, and the outlet pressure of the second pressure reducing valve is greater than the outlet pressure of the first pressure reducing valve; preferably, the outlet pressure value of the first pressure reducing valve is 5-20kPa, the outlet pressure value of the second pressure reducing valve is 30-70kPa, and the second flow control branch and the first flow control branch can be respectively set as a large flow range control branch and a small flow range control branch.
In some embodiments, the first electrically controlled flow regulating valve and the second electrically controlled flow regulating valve have the same structure, the first electrically controlled flow regulating valve comprises a valve body, a valve core and a stepping motor, the air inlet of the valve body is connected with the output end of the first reducing valve, and the air outlet of the valve body is connected with the oxygen flow sensor; the valve core is arranged in the valve body and used for adjusting the oxygen flow through self rotation; the stepping motor is arranged on the valve body and is respectively connected with the valve core and the control circuit so as to control the rotation of the valve core according to the instruction of the control circuit. Understandably, the valve body air inlet of the second electric control flow regulating valve is connected with the output end of the second reducing valve.
Understandably, before step S101, it is necessary to perform linear calibration on the initial value of the oxygen generator, specifically: electrifying for initialization, closing the electric control flow regulating valve, resetting the pulse number of the step value, then opening the first electric control flow regulating valve in the first flow control branch, fully opening the valve of the first electric control flow regulating valve, and recording the pulse number f of the step value of the step motor in the first electric control flow regulating valve at the momentsmallSimultaneously, the small flow full-scale flow value V is measuredsmallAnd the corresponding number f of step-value pulsessmallWriting into a memory; then the first electric control flow regulating valve is closed, the second electric control flow regulating valve in the second flow control branch is opened, and the second electric control flow regulating valve tracks to the full-scale flow value V of the small flow branch according to the closed-loop control algorithmsmallSet it to be a large flowFlow value V at lower limit of measuring rangeminWill VminAnd the corresponding number f of step-value pulsesminWriting into a memory; after the first electric control flow regulating valve is closed, the second electric control flow regulating valve can be opened to fully open the valve, and the pulse number f of the stepping value of the stepping motor in the second electric control flow regulating valve is recordedmaxSimultaneously, the large flow and the full-scale flow value V are usedmaxAnd the corresponding number f of step-value pulsesmaxAnd writing into a memory, and finishing calibration.
S102, obtaining target oxygen supply amount V by adopting a linear interpolation algorithm according to the flow control branch determined to be communicatedtargetNumber of corresponding step value pulses ftarget。
The method specifically comprises the following steps: if the first flow control branch is determined to be conducted, according to a formula
Calculating to obtain a target oxygen supply amount VtargetNumber of corresponding step value pulses ftargetWherein V issmallFor the first flow control branch full scale flow value, fsmallIs a VsmallThe corresponding step value pulse number; if the second flow control branch is determined to be conducted, according to the formula
Calculating to obtain a target oxygen supply amount VtargetNumber of corresponding step value pulses ftargetWherein V isminFor the second flow control branch range lower limit flow value, fminIs a VminNumber of corresponding step value pulses, VmaxFor the second flow control branch full scale flow value, fmaxIs a VmaxThe corresponding number of step value pulses.
S103, the control circuit obtains the pulse number f according to the obtained step valuetargetAnd adjusting the opening of the electric control flow adjusting valve in the corresponding flow control branch to initially adjust the oxygen flow output by the oxygen generator.
In this embodiment, the control circuit includes a motor drive circuit and a microprocessor, and the motor drive circuit is connected to the stepping motors in the first and second electrically controlled flow control valves to adjust the opening of the first or second electrically controlled flow control valve; the microprocessor motor driving circuit is connected with the oxygen flow sensor to determine whether the first flow control branch or the second flow control branch is switched on according to the target oxygen supply amount, then the step value pulse number corresponding to the target oxygen supply amount is obtained, and a step value pulse instruction is output to the motor driving circuit to drive a step motor of an electric control flow regulating valve in the corresponding flow control branch, so that the opening degree of a valve port is enabled to be at a proper position, and the output oxygen flow is initially regulated to be close to the target oxygen supply amount.
And S104, finely adjusting the oxygen flow output by the oxygen generator according to the oxygen output flow acquired by the oxygen flow sensor so that the oxygen flow output by the oxygen generator is a target oxygen supply amount.
In this step, the actual output oxygen flow is finely adjusted by a closed-loop control method according to the collected real-time oxygen output flow, so that the actual output oxygen flow is equal to the target oxygen supply amount.
Understandably, when the flow control branch needs to be switched in the use process of the oxygen generator, namely when a user sets a new target oxygen supply amount, the opening degree of a valve port of the electric control flow valve of the current flow branch is gradually closed to enable the output oxygen flow to be zero, then the flow control branch is switched to the target flow branch, the opening degree of the electric control flow regulating valve is regulated according to the target oxygen supply amount and the oxygen output flow from the oxygen flow sensor, namely, the opening degree of the branch electric control flow regulating valve is gradually opened according to the number of step value pulses, so that the actual output oxygen flow of the small oxygen generator is equal to the target oxygen supply amount. When the variable flow switching control is applied to the continuous flow servo control situation, the switching process considers that the first flow control branch and the second flow control branch have different flow response characteristics, an over-damping adjusting mode can be adopted to avoid an overshoot phenomenon, and the adjusting time is shortened.
The small oxygen generator comprises a compressor, a molecular sieve adsorption tower and a gas storage tank which are sequentially connected through pipelines, wherein the oxygen outlet end of the gas storage tank is connected with a gas pipeline, the small oxygen generator further comprises the small oxygen generator flow control device in the embodiment, and the flow control device is connected between the oxygen outlet end of the gas storage tank and the gas pipeline so as to adjust the oxygen flow output by the oxygen generator. Therefore, the flow control device is adopted to control different flow range ranges in the whole flow range of the oxygen generator through two independent branches, so that unstable states such as system overshoot or oscillation caused by mismatching of flow coefficient values are avoided, and meanwhile, the flow response sensitivity can be reduced, so that the flow control stability is improved.
It should be noted that, in the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments. While, for purposes of simplicity of explanation, the foregoing method embodiments have been described as a series of acts or combination of acts, it will be appreciated by those skilled in the art that the present invention is not limited by the illustrated ordering of acts, as some steps may occur in other orders or concurrently with other steps in accordance with the invention. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required by the invention.
The foregoing is considered as illustrative of the preferred embodiments of the invention and is not to be construed as limiting the invention in any way. Various equivalent changes and modifications can be made by those skilled in the art based on the above embodiments, and all equivalent changes and modifications within the scope of the claims should fall within the protection scope of the present invention.
Claims (9)
1. The utility model provides a small-size oxygenerator flow control device which characterized in that, including:
the first flow control branch is connected with the gas storage tank of the oxygen generator and comprises a first pressure reducing valve and a first electric control flow regulating valve which are sequentially connected;
the second flow control branch is connected with the gas storage tank of the oxygen generator and comprises a second pressure reducing valve and a second electric control flow regulating valve which are sequentially connected, and the outlet pressure of the second pressure reducing valve is greater than the outlet pressure of the first pressure reducing valve;
the oxygen flow sensor is arranged at the output ends of the first electric control flow regulating valve and the second electric control flow regulating valve so as to collect the real-time oxygen output flow of the oxygen generator;
and the control circuit is connected with the first electric control flow regulating valve, the second electric control flow regulating valve and the oxygen flow sensor so as to regulate the opening degree of the first electric control flow regulating valve or the second electric control flow regulating valve according to the target oxygen supply amount and the oxygen outlet flow from the oxygen flow sensor.
2. The small oxygen generator flow control device according to claim 1, wherein the first and second electrically controlled flow control valves are identical in structure, and the first electrically controlled flow control valve comprises:
the air inlet of the valve body is connected with the output end of the first pressure reducing valve, and the air outlet of the valve body is connected with the oxygen flow sensor;
the valve core is arranged in the valve body and used for adjusting the oxygen flow through self rotation;
and the stepping motor is arranged on the valve body and is respectively connected with the valve core and the control circuit so as to control the rotation of the valve core according to the instruction of the control circuit.
3. The small oxygen generator flow control device according to claim 2, wherein said control circuit comprises:
the motor driving circuit is connected with the stepping motors of the first electric control flow regulating valve and the second electric control flow regulating valve so as to regulate the opening degree of the first electric control flow regulating valve or the second electric control flow regulating valve;
and the microprocessor is connected with the motor driving circuit and the oxygen flow sensor so as to obtain the number of the stepping value pulses of the stepping motor corresponding to the target oxygen supply amount according to the target oxygen supply amount, output a stepping value pulse instruction to the motor driving circuit so as to drive the corresponding stepping motor, and adjust the oxygen flow output by the oxygen generator to the target oxygen supply amount according to the oxygen output flow from the oxygen flow sensor.
4. The small oxygen generator flow control device according to claim 1, wherein the outlet pressure value of the first pressure reducing valve is 5-20 kPa.
5. The small oxygen generator flow control device according to claim 1, wherein the outlet pressure value of the second pressure reducing valve is 30-70 kPa.
6. The utility model provides a small-size oxygenerator, is including compressor, molecular sieve adsorption tower, the gas holder that loops through the tube coupling, the gas holder goes out the oxygen end and is connected with gas transmission pipeline, its characterized in that: the small oxygen generator further comprises a flow control device of the small oxygen generator as claimed in claims 1 to 5, wherein the flow control device is connected between the oxygen outlet end of the gas storage tank and the gas transmission pipeline so as to adjust the oxygen flow output by the oxygen generator.
7. A flow control method for a small oxygen generator is characterized by comprising the following steps:
the control circuit is used for controlling the oxygen supply according to the set target oxygen supply amount VtargetDetermining whether a first flow control branch connected with the gas storage tank or a second flow control branch is conducted; the first flow control branch comprises a first pressure reducing valve and a first electric control flow regulating valve which are sequentially connected, the second flow control branch comprises a second pressure reducing valve and a second electric control flow regulating valve which are sequentially connected, and the outlet pressure of the second pressure reducing valve is greater than the outlet pressure of the first pressure reducing valve;
obtaining a target oxygen supply amount V by adopting a linear interpolation algorithm according to the flow control branch which is determined to be communicatedtargetNumber of corresponding step value pulses ftarget；
The control circuit obtains the pulse number f according to the obtained step valuetargetThe opening degree of an electric control flow regulating valve in the corresponding flow control branch is regulated so as to initially regulate the oxygen flow output by the oxygen generator;
and finely adjusting the oxygen flow output by the oxygen generator according to the oxygen output flow acquired by the oxygen flow sensor so as to ensure that the oxygen flow output by the oxygen generator is the target oxygen supply amount.
8. The flow control method of a small oxygen generator as claimed in claim 7, wherein the target oxygen supply amount V is obtained by the flow control branch determined to be connected by adopting a linear interpolation algorithmtargetNumber of corresponding step value pulses ftargetThe method specifically comprises the following steps:
if the first flow control branch is determined to be conducted, according to a formula
Calculating to obtain a target oxygen supply amount VtargetNumber of corresponding step value pulses ftargetWherein V issmallFor the first flow control branch full scale flow value, fsmallIs a VsmallThe corresponding number of step value pulses.
9. The flow control method of a small oxygen generator as claimed in claim 7, wherein the target oxygen supply amount V is obtained by the flow control branch determined to be connected by adopting a linear interpolation algorithmtargetNumber of corresponding step value pulses ftargetThe method specifically comprises the following steps:
if the second flow control branch is determined to be conducted, according to the formula
Calculating to obtain a target oxygen supply amount VtargetNumber of corresponding step value pulses ftargetWherein V isminFor the second flow control branch range lower limit flow value, fminIs a VminNumber of corresponding step value pulses, VmaxFor the second flow control branch full scale flow value, fmaxIs a VmaxThe corresponding number of step value pulses.
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Cited By (2)
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| CN114028668A (en) * | 2021-10-28 | 2022-02-11 | 中国船舶重工集团公司第七一八研究所 | Control method of pulse gas volume of pulse type oxygen generation equipment |
| CN114326874A (en) * | 2021-12-13 | 2022-04-12 | 天津怡和嘉业医疗科技有限公司 | Control method, control device and control system of oxygen production equipment |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001259342A (en) * | 2000-03-16 | 2001-09-25 | Marutaka Co Ltd | Flow rate adjusting device of oxygen enriching apparatus |
| JP2009054094A (en) * | 2007-08-29 | 2009-03-12 | Ckd Corp | Flow rate inspection system and flow rate inspection method |
| CN202024094U (en) * | 2011-04-28 | 2011-11-02 | 山东三木自动化有限公司 | Flow measurement device for coke oven gas |
| CN103320569A (en) * | 2013-05-09 | 2013-09-25 | 马钢控制技术有限责任公司 | Oxygen pressure adjustment apparatus and adjustment method for electric furnace |
| CN204022867U (en) * | 2014-07-23 | 2014-12-17 | 马钢(集团)控股有限公司 | A kind of pipeline pressure wider range control device |
| CN104671213A (en) * | 2015-03-12 | 2015-06-03 | 肖永初 | Closed-loop system oxygenator and flow/concentration regulating closed-loop control system thereof |
| CN204477696U (en) * | 2015-03-16 | 2015-07-15 | 青岛新奥燃气设施开发有限公司 | Industrial and commercial units' air feed seperating range control device |
| CN204629093U (en) * | 2015-05-07 | 2015-09-09 | 仪征祥源动力供应有限公司 | A kind of steam Small Flow Control System |
| CN105700578A (en) * | 2016-01-08 | 2016-06-22 | 航电中和山东医疗技术有限公司 | Oxygenator oxygen flow control system and method |
| CN205999012U (en) * | 2016-08-24 | 2017-03-08 | 广东欧格斯科技有限公司 | Oxygenerator flow control assembly and oxygenerator |
| CN212319411U (en) * | 2020-08-25 | 2021-01-08 | 深圳市德达康健股份有限公司 | Small-size oxygenerator and flow control device thereof |
-
2020
- 2020-08-25 CN CN202010864315.6A patent/CN111911807A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001259342A (en) * | 2000-03-16 | 2001-09-25 | Marutaka Co Ltd | Flow rate adjusting device of oxygen enriching apparatus |
| JP2009054094A (en) * | 2007-08-29 | 2009-03-12 | Ckd Corp | Flow rate inspection system and flow rate inspection method |
| CN202024094U (en) * | 2011-04-28 | 2011-11-02 | 山东三木自动化有限公司 | Flow measurement device for coke oven gas |
| CN103320569A (en) * | 2013-05-09 | 2013-09-25 | 马钢控制技术有限责任公司 | Oxygen pressure adjustment apparatus and adjustment method for electric furnace |
| CN204022867U (en) * | 2014-07-23 | 2014-12-17 | 马钢(集团)控股有限公司 | A kind of pipeline pressure wider range control device |
| CN104671213A (en) * | 2015-03-12 | 2015-06-03 | 肖永初 | Closed-loop system oxygenator and flow/concentration regulating closed-loop control system thereof |
| CN204477696U (en) * | 2015-03-16 | 2015-07-15 | 青岛新奥燃气设施开发有限公司 | Industrial and commercial units' air feed seperating range control device |
| CN204629093U (en) * | 2015-05-07 | 2015-09-09 | 仪征祥源动力供应有限公司 | A kind of steam Small Flow Control System |
| CN105700578A (en) * | 2016-01-08 | 2016-06-22 | 航电中和山东医疗技术有限公司 | Oxygenator oxygen flow control system and method |
| CN205999012U (en) * | 2016-08-24 | 2017-03-08 | 广东欧格斯科技有限公司 | Oxygenerator flow control assembly and oxygenerator |
| CN212319411U (en) * | 2020-08-25 | 2021-01-08 | 深圳市德达康健股份有限公司 | Small-size oxygenerator and flow control device thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114028668A (en) * | 2021-10-28 | 2022-02-11 | 中国船舶重工集团公司第七一八研究所 | Control method of pulse gas volume of pulse type oxygen generation equipment |
| CN114028668B (en) * | 2021-10-28 | 2023-06-09 | 中国船舶重工集团公司第七一八研究所 | Pulse gas quantity control method of pulse type oxygen making equipment |
| CN114326874A (en) * | 2021-12-13 | 2022-04-12 | 天津怡和嘉业医疗科技有限公司 | Control method, control device and control system of oxygen production equipment |
| CN114326874B (en) * | 2021-12-13 | 2023-12-01 | 天津怡和嘉业医疗科技有限公司 | Control method, control equipment and control system of oxygen production equipment |
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