CN114460978A - Large-range high-precision fluid adjusting device and method - Google Patents
Large-range high-precision fluid adjusting device and method Download PDFInfo
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- CN114460978A CN114460978A CN202210041472.6A CN202210041472A CN114460978A CN 114460978 A CN114460978 A CN 114460978A CN 202210041472 A CN202210041472 A CN 202210041472A CN 114460978 A CN114460978 A CN 114460978A
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- 239000012530 fluid Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 11
- 230000001105 regulatory effect Effects 0.000 claims abstract description 12
- 238000013459 approach Methods 0.000 claims abstract description 5
- 229910002056 binary alloy Inorganic materials 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 3
- 230000003750 conditioning effect Effects 0.000 claims 2
- 208000005646 Pneumoperitoneum Diseases 0.000 description 7
- 238000002324 minimally invasive surgery Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 210000000683 abdominal cavity Anatomy 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D7/00—Control of flow
- G05D7/06—Control of flow characterised by the use of electric means
- G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
- G05D7/0629—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means
- G05D7/0635—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means by action on throttling means
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Abstract
The invention discloses a large-range high-precision fluid regulating device and a method, wherein the device comprises an input bus bar with a fluid input end, an output bus bar with a fluid output end, a plurality of groups of branches connected in parallel between the input bus bar and the output bus bar, and a control module, wherein each group of branches is connected in series with an electromagnetic valve and a throttle valve, the electromagnetic valves of all the groups are controlled by the control module to be opened and closed respectively, all the groups of branches correspond to different bit weight values step by step respectively, and the flow value of the throttle valve is set according to the bit weight value of the branch in the group; when the control module works, the control module adopts a control mode of step control and fine adjustment, and according to the set flow or pressure, the control module is adjusted step by step from large step to small step, and the branch of the corresponding weight value is opened or closed, so that the output flow or pressure gradually approaches to the set value. The invention does not need a proportional valve, realizes the high-precision and large-range regulation of the fluid, and has convenient combination, flexible regulation and wide application.
Description
Technical Field
The invention belongs to the field of precision instruments, and particularly relates to a large-range high-precision fluid adjusting device and method.
Background
In the field of precision instruments, a device capable of realizing high-precision adjustment of fluid is often needed, for example, in a minimally invasive surgery in the medical industry, a pneumoperitoneum machine is used as a core device of the minimally invasive surgery of an abdominal cavity, and the adjustment precision of the fluid has high requirements. However, the localization of high-precision fluid regulating devices such as pneumoperitoneum machines at present has the following problems:
1. domestic flow regulation is extensive (e.g., utility model patent 20062010527 discloses a full-automatic pneumoperitoneum machine manufacturing method, using three flow valves of 4L/min, 12L/min, 14L/min to control the pneumoperitoneum machine flow), while foreign similar products can already carry out fine regulation at the level of 0.1L/min (e.g., German STORZ pneumoperitoneum machine);
2. although the method can continuously adjust the gas flow, firstly, domestic proportional valves do not reach the industrial application level temporarily, and need to be imported into foreign products, and secondly, all the prior proportional valves cannot meet the requirement of large-scale fluid adjustment.
Disclosure of Invention
The invention aims to provide a large-range high-precision fluid adjusting device and method, which do not need a proportional valve, realize high-precision and large-range adjustment of fluid, are convenient to combine, are flexible to adjust and are wide in application.
The technical scheme adopted by the invention is as follows:
a large-range high-precision fluid regulating device comprises an input bus bar with a fluid input end, an output bus bar with a fluid output end, a plurality of groups of branches connected in parallel between the input bus bar and the output bus bar, and a control module, wherein each group of branches is connected in series with an electromagnetic valve and a throttle valve, the electromagnetic valves of all the groups are controlled to be opened and closed by the control module respectively, all the groups of branches correspond to different bit weights step by step respectively, and the flow value of the throttle valve is set according to the bit weight value of the branch in the group; when the control module works, the control module adopts a control mode of step control and fine adjustment, and gradually adjusts from large step to small step according to the set flow or pressure, and opens or closes the branch of the corresponding bit weight value, so that the output flow or pressure gradually approaches to the set value.
Preferably, all the groups of branches respectively correspond to different bit weights step by step according to a binary system, the flow value of the throttle valve on the upper branch is twice that of the throttle valve on the lower branch, when the control module works, the control module outputs a corresponding binary code according to set flow or pressure, each bit of the code corresponds to the branch with the corresponding bit weight, and the opening and closing of the corresponding electromagnetic valve are controlled through the state of 0/1.
Preferably, the control circuit of the control module is a combination of a single chip microcomputer circuit and an electromagnetic valve driving circuit, or a combination of an encoding and decoding circuit and an electromagnetic valve driving circuit.
Preferably, 10 groups of branches are adopted, and the flow values of the throttle valves on each group of branches are respectively 0.1L/min, 0.2L/min, 0.4L/min, 0.8L/min, 1L/min, 2L/min, 4L/min, 8L/min, 16L/min and 32L/min.
Preferably, the input and output busbars are provided with pressure and/or flow measuring interfaces.
Preferably, the throttle valve uses a manual or electric set flow value.
A large-range high-precision fluid regulating method features that several groups of parallelly connected branches are arranged between fluid input and output ends, each group of branches is serially connected with electromagnetic valve and throttle valve, all the groups of branches are respectively step-by-step correspondent to different weight values, and the flow value of throttle valve is set according to the weight value of branch.
Preferably, all the groups of branches respectively correspond to different bit weights step by step according to a binary system, the flow value of the throttle valve on the upper branch is twice that of the throttle valve on the lower branch, when the valve works, a corresponding binary code is obtained according to set flow or pressure, each bit of the code corresponds to the branch with the corresponding bit weight, and the opening and closing of the corresponding electromagnetic valve are controlled through the state of 0/1.
Preferably, 10 groups of branches are adopted, and the flow values of the throttle valves on each group of branches are respectively 0.1L/min, 0.2L/min, 0.4L/min, 0.8L/min, 1L/min, 2L/min, 4L/min, 8L/min, 16L/min and 32L/min.
The invention has the beneficial effects that:
the invention adopts a parallel connection and multistage electromagnetic valve and throttle valve combination mode and a control mode of step control and fine adjustment to replace the proportional valve, thereby realizing high-precision adjustment of fluid, avoiding the problems of low quality or overhigh cost of the proportional valve, dispersing the risk of equipment failure, overcoming the inherent defects of the proportional valve, realizing large-range adjustment of the fluid and achieving the advanced performance index; in the invention, the flow value of the throttle valve on the lowest-level branch determines the resolution and the regulation precision of the whole system, the flow value of the throttle valve on the highest-level branch determines the maximum step quantity of the whole system, and the larger the branch quantity N is, the larger the regulation range and the regulation and control capability are, so that the branch quantity N, each weight and flow value can be set as required, the combination is convenient, and the regulation is flexible; the device is not limited to be used in a minimally invasive surgery pneumoperitoneum machine, and can also be applied to other pneumatic/hydraulic equipment needing precise adjustment, so that the device is widely applied.
Drawings
Fig. 1 is a schematic structural diagram of a wide-range high-precision fluid regulating device in an embodiment of the invention.
FIG. 2 is a schematic diagram of an input/output bus according to an embodiment of the present invention.
In the figure: 1-an input bus; 2-an electromagnetic valve; 3-branch; 4-a throttle valve; 5-output bus.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in fig. 1, a large-range high-precision fluid regulating device comprises an input bus bar 1 with a fluid input end, an output bus bar 5 with a fluid output end, a plurality of groups of branches 3 connected in parallel between the input bus bar 1 and the output bus bar 5, and a control module, wherein each group of branches is connected in series with an electromagnetic valve 2 and a throttle valve 4, the electromagnetic valves 2 of all groups are controlled by the control module to open and close respectively, all groups of branches 3 correspond to different bit weight values step by step respectively, and the flow value of the throttle valve 4 is set according to the bit weight value of the branch 3 of the group; when the control module works, the control module adopts a control mode of step control and fine adjustment, and gradually adjusts from large step to small step according to the set flow or pressure, and opens or closes the branch 3 of the corresponding weight value, so that the output flow or pressure gradually approaches to the set value.
In this embodiment, all the groups of branches 3 respectively correspond to different bit weights step by step according to a binary system, the flow value of the throttle 4 on the previous branch 3 is twice as large as the flow value of the throttle 4 on the next branch 3, and the control module is operatedAnd outputting a corresponding binary code according to the set flow or pressure, wherein each bit of the code corresponds to a branch of the corresponding bit weight, and controlling the opening and closing of the corresponding electromagnetic valve 2 through the state of 0/1. The above arrangement can be implemented as 2NThe flow value on each branch 3 corresponds to the bit weight value, and can be 0.1L/min, 0.2L/min, 0.4L/min, 0.8L/min …, or can be a more precise value, such as 0.01L/min, 0.02L/min, 0.04L/min, 0.08L/min, in short, the higher the setting precision, the more precise the adjustment. Of course, binary systems, decimal systems, ternary systems and the like are not required to be adopted, the binary systems are adopted in the application, the control coding is convenient on one hand, and the difference between the front level and the rear level is not too large or too small on the other hand.
In this embodiment, the control circuit of the control module is a combination of a single chip microcomputer circuit and an electromagnetic valve driving circuit, or a combination of an encoding and decoding circuit and an electromagnetic valve driving circuit.
In the present embodiment, the throttle valve 4 adopts a manually set flow rate value.
As shown in FIG. 1, in the present embodiment, a 24V solenoid valve is selected, 10 sets of branch circuits 3 are adopted, and the flow rate values of the throttle 4 on each set of branch circuits 3 are respectively 0.1L/min, 0.2L/min, 0.4L/min, 0.8L/min, 1L/min, 2L/min, 4L/min, 8L/min, 16L/min and 32L/min, as shown in Table 1.
TABLE 1 Branch flow settings
| Branch sequence number | 2-ary coded bit weights | Flow setting (Unit L/min) |
| 0 | 1 | 0.1 |
| 1 | 2 | 0.2 |
| 2 | 4 | 0.4 |
| 3 | 8 | 0.8 |
| 4 | 16 | 1 |
| 5 | 32 | 2 |
| 6 | 64 | 4 |
| 7 | 128 | 8 |
| 8 | 256 | 16 |
| 9 | 512 | 32 |
The flow can be finely adjusted by 1024 steps within the range from 0.1L/min to 64L/min, and the set value can be gradually approached. Of course, it is not necessary to use 10 sets of branch lines 3 and the selected flow values described above, and 6, 8, 12, etc. sets may be selected as desired, and in any case, determined according to specific needs.
As shown in fig. 2, in the present embodiment, the input busbar 1 and the output busbar 5 are provided with pressure and/or flow measurement interfaces. The input bus bar 1 and the output bus bar 5 have (N + m) access capacity, and besides completing N-way 'electromagnetic valve + throttle valve' access, the input bus bar 1 and the output bus bar 5 also have input/output interfaces and pressure, flow and other measurement interfaces, as shown in fig. 2, on the regular hexahedral metal blocks of the input bus bar 1 and the output bus bar 5, one surface is provided with N gas path interfaces, the end surface is provided with the input/output interfaces, and the other surface is provided with a plurality of interfaces for installing sensors for measuring fluid pressure or flow and the like.
The invention adopts a parallel connection and multistage electromagnetic valve and throttle valve combination mode and a control mode of step control and fine adjustment to replace the proportional valve, thereby realizing high-precision adjustment of fluid, avoiding the problems of low quality or overhigh cost of the proportional valve, dispersing the risk of equipment failure, overcoming the inherent defects of the proportional valve, realizing large-range adjustment of the fluid and achieving the advanced performance index; in the invention, the flow value of the throttle valve on the lowest-level branch determines the resolution and the regulation precision of the whole system, the flow value of the throttle valve on the highest-level branch determines the maximum step quantity of the whole system, and the larger the branch quantity N is, the larger the regulation range and the regulation and control capability are, so that the branch quantity N, each weight and flow value can be set as required, the combination is convenient, and the regulation is flexible; the device is not limited to be used in a minimally invasive surgery pneumoperitoneum machine, and can also be applied to other pneumatic/hydraulic equipment needing precise adjustment, so that the device is widely applied.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (9)
1. A wide range high accuracy fluid regulating device which characterized in that: the system comprises an input bus bar with a fluid input end, an output bus bar with a fluid output end, a plurality of groups of branches connected in parallel between the input bus bar and the output bus bar, and a control module, wherein each group of branches is connected in series with an electromagnetic valve and a throttle valve, the electromagnetic valves of all the groups are controlled by the control module to be opened and closed, all the groups of branches respectively correspond to different bit weight values step by step, and the flow value of the throttle valve is set according to the bit weight value of the branch in the group; when the control module works, the control module adopts a control mode of step control and fine adjustment, and gradually adjusts from large step to small step according to the set flow or pressure, and opens or closes the branch of the corresponding bit weight value, so that the output flow or pressure gradually approaches to the set value.
2. The wide range high precision fluid regulating device according to claim 1, wherein: all the groups of branches respectively correspond to different bit weight values step by step according to a binary system, the flow value of the throttle valve on the upper branch is twice of the flow value of the throttle valve on the lower branch, when the control module works, the control module outputs corresponding binary codes according to set flow or pressure, each bit of the codes corresponds to the branch with the corresponding bit weight value, and the opening and closing of the corresponding electromagnetic valve are controlled through the state of 0/1.
3. The wide range high precision fluid regulating device according to claim 2, wherein: the control circuit of the control module is a combination of a singlechip circuit and an electromagnetic valve drive circuit, or a combination of a coding and decoding circuit and an electromagnetic valve drive circuit.
4. The wide range high precision fluid regulating device according to claim 2, wherein: 10 groups of branches are adopted, and the flow values of the throttle valves on the branches are respectively 0.1L/min, 0.2L/min, 0.4L/min, 0.8L/min, 1L/min, 2L/min, 4L/min, 8L/min, 16L/min and 32L/min.
5. The wide range high precision fluid regulating device according to claim 1, wherein: the input bus and the output bus are provided with pressure and/or flow measurement interfaces.
6. The wide range high precision fluid regulating device according to claim 1, wherein: the throttle valve adopts a manual or electric setting flow value.
7. A large-range high-precision fluid adjusting method is characterized in that: the method comprises the steps of setting a plurality of groups of branches connected in parallel between a fluid input end and a fluid output end, connecting an electromagnetic valve and a throttle valve in series on each group of branches, respectively corresponding different bit weight values step by step, setting the flow value of the throttle valve according to the bit weight value of the branch in the group, adopting a control mode of step control and fine adjustment during work, gradually adjusting from large step to small step according to set flow or pressure, and opening or closing the electromagnetic valve on the branch with the corresponding bit weight value to enable the output flow or pressure to gradually approach the set value.
8. A wide range high precision fluid conditioning method as claimed in claim 7, wherein: all the groups of branches respectively correspond to different bit weights step by step according to a binary system, the flow value of the throttle valve on the upper branch is twice of the flow value of the throttle valve on the lower branch, when the valve works, a corresponding binary code is obtained according to set flow or pressure, each bit of the code corresponds to the branch with the corresponding bit weight, and the opening and closing of the corresponding electromagnetic valve are controlled through the state of 0/1.
9. A wide range high precision fluid conditioning method as claimed in claim 7, wherein: 10 groups of branches are adopted, and the flow values of the throttle valves on the branches are respectively 0.1L/min, 0.2L/min, 0.4L/min, 0.8L/min, 1L/min, 2L/min, 4L/min, 8L/min, 16L/min and 32L/min.
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| CN202210041472.6A CN114460978A (en) | 2022-01-14 | 2022-01-14 | Large-range high-precision fluid adjusting device and method |
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| CN202210041472.6A CN114460978A (en) | 2022-01-14 | 2022-01-14 | Large-range high-precision fluid adjusting device and method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0264032A2 (en) * | 1986-10-04 | 1988-04-20 | Bopp & Reuther Aktiengesellschaft | Method for regulating flow-dependent magnitudes |
| CN1570403A (en) * | 2003-07-18 | 2005-01-26 | 庄海 | Digitalized linear proportional flow parallel control valve |
| JP2008020102A (en) * | 2006-07-12 | 2008-01-31 | Daihen Corp | Fluid supply device |
| KR20140115039A (en) * | 2013-03-20 | 2014-09-30 | 배정이 | Mass flow controller with motor driving circuit |
| CN106679925A (en) * | 2016-12-15 | 2017-05-17 | 中国航空工业集团公司沈阳空气动力研究所 | High-precision control device and control method for micro-mass jet flow rate |
-
2022
- 2022-01-14 CN CN202210041472.6A patent/CN114460978A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0264032A2 (en) * | 1986-10-04 | 1988-04-20 | Bopp & Reuther Aktiengesellschaft | Method for regulating flow-dependent magnitudes |
| CN1570403A (en) * | 2003-07-18 | 2005-01-26 | 庄海 | Digitalized linear proportional flow parallel control valve |
| JP2008020102A (en) * | 2006-07-12 | 2008-01-31 | Daihen Corp | Fluid supply device |
| KR20140115039A (en) * | 2013-03-20 | 2014-09-30 | 배정이 | Mass flow controller with motor driving circuit |
| CN106679925A (en) * | 2016-12-15 | 2017-05-17 | 中国航空工业集团公司沈阳空气动力研究所 | High-precision control device and control method for micro-mass jet flow rate |
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