CN111896061A - Small-flow laminar flow element - Google Patents
Small-flow laminar flow element Download PDFInfo
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- CN111896061A CN111896061A CN201910377347.0A CN201910377347A CN111896061A CN 111896061 A CN111896061 A CN 111896061A CN 201910377347 A CN201910377347 A CN 201910377347A CN 111896061 A CN111896061 A CN 111896061A
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- laminar flow
- main body
- groove
- flow
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
- G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
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- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention discloses a laminar flow element for measuring small flow (less than 1L/min) fluid, which comprises an upper main body, a lower main body, an upper main body connecting piece, a lower main body connecting piece and a fixing structure, wherein a laminar flow groove is formed on the connecting surface of the upper main body and the lower main body, and sealing grooves are formed on two sides of the laminar flow groove. Compared with the prior art, the invention has the advantages of simple manufacturing process, convenient mechanical processing, stable process and reduced processing cost.
Description
Technical Field
The present invention relates to the field of flow measurement.
Background
A laminar flow element is an element that converts the flow regime of a fluid from turbulent flow to laminar flow. In the laminar flow state, the flow pressure loss of the fluid is proportional to the flow velocity. The laminar flow element is mainly applied to the field of flow measurement and is a core element of a laminar flow flowmeter and a laminar flow controller.
The laminar flow element is designed to have small flow channels through which fluid flows to form a laminar flow. At present, laminar flow elements are generally made of capillary tubes, and for example, patent No. CN201220237073 discloses a capillary tube type laminar flow element which is formed by embedding stainless steel thin tubes with the diameter of 1mm or less in a cylindrical corrosion-resistant polymer material. There are also laminar flow elements formed by rolling corrugated plates and flat plates, and allowing fluid to flow through the gaps between the corrugated plates and the flat plates to form laminar flow, for example, an engine instantaneous flow measurement laminar flow meter disclosed in patent No. CN200820060508, in which the laminar flow element used therein is the one that is adopted. In addition, there are some other types of laminar flow elements, for example, one disclosed in patent No. CN201510610447 uses a stainless steel round bar stack to form a gap as the laminar flow element.
The laminar flow elements mentioned above are often not suitable for measuring small flows of fluid due to their structural limitations. For example, when using capillaries, it is necessary to reduce the diameter of the capillaries and the number of capillaries when constructing a low-flow laminar flow element. In order to ensure the processing quality of the inner surface of the capillary tube and avoid damaging a laminar flow structure, the diameter of the capillary tube is generally difficult to be less than 0.2 mm; too small a capillary diameter can also result in insufficient stiffness and difficulty in assembly. The corrugated plate is more difficult to roll into the laminar flow element with small flow. Generally, the problems of high manufacturing difficulty, unstable process, high processing cost and the like exist in the prior art for manufacturing the laminar flow element with small flow rate below 1L/min.
Disclosure of Invention
The invention aims to provide a laminar flow element, which solves the problems that the conventional laminar flow element is not suitable for measuring small-flow fluid, and the laminar flow element is difficult to manufacture, unstable in process and high in processing cost in the process of modifying the laminar flow element on the basis of the prior art.
The content of the invention is as follows: a laminar flow element characterized by: the connecting structure comprises an upper main body, a lower main body and an upper main body connecting piece and a lower main body connecting piece, wherein a layer flow groove is arranged on the connecting surface of the lower main body and the upper main body, sealing grooves are arranged on the two sides of the layer flow groove in parallel, sealing materials are filled in the sealing grooves, and the upper main body connecting piece and the lower main body connecting piece are arranged on the outer.
The connecting surface of the lower main body and the upper main body is flat and smooth.
The length of the laminar flow groove is consistent with the length of the upper main body and the lower main body.
The cross-sectional area of the laminar flow groove is less than or equal to 2mm 2.
The laminar flow groove is rectangular.
The laminar flow groove is polygonal in shape.
The laminar flow groove is arc-shaped.
The distance between the sealing groove and the layer flow groove is less than or equal to 2 mm.
The invention creatively solves the problems that the traditional laminar flow element is not suitable for measuring the fluid flow of 1L/min and is difficult to manufacture. The laminar flow groove is arranged on the connecting surface between the upper main body and the lower main body, so that a laminar flow channel is formed among the upper main body, the lower main body and the laminar flow groove and is used for measuring small-flow fluid. Compared with the existing laminar flow element, the laminar flow element designed by the invention has the advantages of simple processing and manufacturing, convenient mechanical processing, stable process and low processing cost.
Description of the drawings:
fig. 1 is a schematic structural diagram of a low-flow laminar flow element according to the present invention.
Fig. 2 is a schematic view of a lower body structure of a low-flow laminar flow element according to the present invention.
Fig. 3 is a schematic view of a laminar flow channel in a low flow laminar flow element according to the present invention.
In the figure: 1. the upper main body, 2, sealing material, 3, lower main body, 4, laminar flow channel, 5, upper and lower main body connecting piece, 6, fixed structure, 7, sealing groove, 8, laminar flow groove
The specific implementation mode is as follows:
for a better understanding and appreciation of the structural features and advantages achieved by the present invention, reference should be made to the following detailed description of the preferred embodiments taken in conjunction with the accompanying drawings, in which:
as shown in fig. 2, a cube with a length, width and height of 20 × 12 × 5mm is used as the lower body 3, and the material can be selected from stainless steel. The lower body 3 is flat and smooth at one side with 20 x 12mm, and a laminar flow groove 8 with the width of 2mm and the height of 0.1mm is arranged on the side along the length direction. A sealing groove 7 parallel to the laminar flow groove 8 is formed in the positions of 1mm away from the two sides of the laminar flow groove 8, and the width of the sealing groove 7 is 1mm and the depth of the sealing groove is 1 mm. The upper and lower body joints 5 are preferably screws, and screw holes 6 for fixing the screws are formed outside the two seal grooves 7.
A cube with length, width and height of 20 x 12 x 5mm is used as the upper body 1, and stainless steel is selected as the material. The upper body 1 has a flat and smooth 20 x 12mm face. The upper main body 1 is provided with a through hole for mounting a screw 5, and the position of the through hole is consistent with that of the lower main body 3.
As shown in fig. 1, the flat and smooth surfaces of the upper body 1 and the lower body 3 are bonded to each other, and the seal groove 7 is filled with a seal material 2 and fixed by a screw 5. The gaps formed among the upper body 1, the lower body 3 and the laminar flow groove 8 are laminar flow channels 4.
When the fluid passes through the laminar flow element, the fluid enters a laminar flow state in the laminar flow channel 4. In this case, the pressure loss of the fluid flowing through the laminar flow member is proportional to the flow rate of the fluid.
The size of the laminar flow channel 4 can be changed by changing the size of the laminar flow groove 8, so that the laminar flow element can adapt to flow with different sizes. As shown in FIG. 3, the length of the laminar flow groove 8 is more than 5mm, the width is less than 5mm, the height is less than 0.4mm, and the flow rate of the laminar flow element is less than 1L/min. The flow rate corresponding to the scheme provided by the embodiment is 0.2L/min.
The sealing groove 7 functions to ensure that the fluid flows along the laminar flow groove 8, and prevent the fluid from leaking to the outside. The upper body 1 and the lower body 3 cannot be tightly attached to each other in practice, and fluid flows along the attaching surfaces of the upper body 1 and the lower body 3 besides the laminar flow groove 8, and the flow of the fluid influences the adaptive flow of the laminar flow element, so that the distance between the sealing groove 7 and the laminar flow groove 8 needs to be less than 2mm, and the flow of the fluid is relatively small.
In this embodiment, the upper and lower body connecting members 5 may be rivets instead of screws. When the upper and lower main body connecting pieces 5 adopt rivets, the threaded holes 6 on the lower main body 3 are changed into through holes. In the solution provided by this embodiment, the cross-sectional shape of the laminar flow channel 8 is rectangular, and may be changed into other shapes, such as a polygon or an arc, without increasing the processing difficulty. When the flow groove is modified into a polygon or an arc, the sectional area of the layer flow groove needs to be ensured to be less than 2mm2To ensure that the flow rate does not exceed 1L/min.
According to the small-flow laminar flow element designed by the invention, the upper main body 1 and the lower main body 3 are processed on the outer surfaces, so that the processing difficulty is low. The size and the processing quality of the laminar flow groove 8 can be easily realized by mechanical processing, and the process is stable and more reliable than schemes such as a capillary tube and a corrugated plate. The low-flow laminar flow element designed by the invention can effectively solve the problem of the design of the laminar flow element below 1L/min at present.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A laminar flow element characterized by: the novel sealing structure comprises an upper main body (1), a lower main body (3), upper and lower main body connecting pieces (5) and a fixing structure (6), wherein a layer flow groove (8) is formed in the connecting surface of the lower main body (3) and the upper main body (1), sealing grooves (7) are formed in the two sides of the layer flow groove (8) in parallel, sealing materials (4) are filled in the sealing grooves (7), and the upper and lower main body connecting pieces (5) are arranged on the outer sides of the sealing grooves (7).
2. The laminar flow member according to claim 1, characterized in that: the connecting surface of the lower main body (3) and the upper main body (1) is flat and smooth.
3. The laminar flow member according to claim 2, characterized in that: the length of the laminar flow groove (8) is consistent with the length of the upper and lower main bodies.
4. The laminar flow member according to claim 3, characterized in that: the cross-sectional area of the laminar flow groove (8) is less than or equal to 2mm2。
5. The laminar flow member according to claim 4, wherein: the laminar flow groove (8) is rectangular.
6. The laminar flow member according to claim 4, wherein: the laminar flow groove (8) is polygonal.
7. The laminar flow member according to claim 4, wherein: the laminar flow groove (8) is arc-shaped.
8. The laminar flow member according to claim 1, characterized in that: the distance between the sealing groove (7) and the laminar flow groove (8) is less than or equal to 2 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910377347.0A CN111896061A (en) | 2019-05-04 | 2019-05-04 | Small-flow laminar flow element |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910377347.0A CN111896061A (en) | 2019-05-04 | 2019-05-04 | Small-flow laminar flow element |
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| CN111896061A true CN111896061A (en) | 2020-11-06 |
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| CN201910377347.0A Pending CN111896061A (en) | 2019-05-04 | 2019-05-04 | Small-flow laminar flow element |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113532568A (en) * | 2021-07-08 | 2021-10-22 | 张巍译 | Fine-gap laminar flow element and sealing method |
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- 2019-05-04 CN CN201910377347.0A patent/CN111896061A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113532568A (en) * | 2021-07-08 | 2021-10-22 | 张巍译 | Fine-gap laminar flow element and sealing method |
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