CN113532568B - Fine slit type laminar flow element and sealing method - Google Patents
Fine slit type laminar flow element and sealing method Download PDFInfo
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- CN113532568B CN113532568B CN202110771600.8A CN202110771600A CN113532568B CN 113532568 B CN113532568 B CN 113532568B CN 202110771600 A CN202110771600 A CN 202110771600A CN 113532568 B CN113532568 B CN 113532568B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D7/00—Control of flow
Abstract
A fine slit type laminar flow element and a sealing method, wherein the laminar flow element comprises a hollow metal outer body, a solid metal inner body and one or more fine hard plastic rods; the hollow metal outer body is tightly matched with the solid metal inner body, the gap formed by contact is subjected to sealing treatment, and rectangular fine gaps are formed at the same time; the rectangular fine gaps are laminar flow channels; one or more rectangular grooves are formed in the left side, the right side and the bottom of the solid metal inner body; the outer vertical surface of the groove is contacted with the hollow metal outer body, a tiny hard plastic rod is inserted into each rectangular groove, and the tiny hard plastic rod is contacted with the hollow metal outer body. The invention has the characteristics of simple assembly and processing technology, good sealing performance, high reliability, stable formed laminar flow, low cost, less number of parts and simple structure, and is suitable for small flow and higher fluid pressure.
Description
Technical Field
The invention relates to fluid flow measurement and control, in particular to a fine slit type laminar flow element and a sealing method.
Background
Laminar flow elements are important elements in the field of flow measurement and control of fluids. In order to form a laminar flow when fluid flows through the laminar flow element, a flow channel with a fine size must be formed on the laminar flow element so that the fluid forms a laminar flow when flowing through the laminar flow element. Typically, capillary tubes are used to make laminar flow elements, however, capillary tubes have significant drawbacks. For example, if the capillary tube is used to make the laminar flow element with small flow, the diameter of the capillary tube becomes very small, which greatly increases the difficulty of processing the capillary tube laminar flow element and greatly increases the processing cost.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a fine slit type laminar flow element and a sealing method, and the invention has the characteristics of simple assembly and processing technology, good sealing performance, high reliability, stable formed laminar flow, low cost, less number of parts and simple structure, and is suitable for small flow and higher fluid pressure.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a kind of fine slit type laminar flow component, including the hollow metal outer body (1), the solid metal inner body (2), and one or more tiny hard plastic sticks, the hollow metal outer body (1) cooperates closely with solid metal inner body (2), the gap formed by contact seals up, there are rectangular fine slits (3) at the same time; the rectangular fine gap (3) is a laminar flow channel; one or more rectangular grooves are formed in the left side, the right side and the bottom of the solid metal inner body (2); the outer vertical surface of the groove is contacted with the hollow metal outer body (1), and a tiny hard plastic rod is inserted into each rectangular groove and is contacted with the hollow metal outer body (1).
The number of the rectangular grooves at the left side, the right side and the bottom of the solid metal inner body (2) is equal or unequal.
The whole appearance of the hollow metal outer body (1) is a hollow cuboid, the outer contour of the cross section of the hollow metal outer body is rectangular, and the contour of the hollow part is rectangular.
The rectangular fine gap (3) is larger than or equal to one.
The hollow metal outer body (1) and the solid metal inner body (2) are contacted to form a gap for sealing, and the sealing method is carried out in one of the following modes:
firstly, after a tiny hard plastic rod is inserted into rectangular grooves on the left side, the right side and the bottom of a solid metal inner body, the solid metal inner body inserted with the tiny hard plastic rod is assembled into a hollow metal outer body by using a hammering or pressing machine, and as the size of the rectangular groove is slightly smaller than that of the tiny hard plastic rod, extrusion force is necessarily generated between the tiny hard plastic rod and the rectangular groove and between the tiny hard plastic rod and the inner wall of the hollow metal outer body, and contact gaps are completely sealed by virtue of the extrusion force between the tiny hard plastic rod and the rectangular groove and between the tiny hard plastic rod and the inner wall of the hollow metal outer body;
secondly, after a tiny hard plastic rod is inserted into rectangular grooves on the left side, the right side and the bottom of the solid metal inner body, the solid metal inner body inserted with the tiny hard plastic rod is assembled into the hollow metal outer body by using a hammering or pressing machine, and as the size of the rectangular groove is slightly smaller than that of the tiny hard plastic rod, extrusion force is necessarily generated between the tiny hard plastic rod and the rectangular groove and between the tiny hard plastic rod and the inner wall of the hollow metal outer body, and contact gaps are completely sealed by virtue of the extrusion force between the tiny hard plastic rod and the rectangular groove and between the tiny hard plastic rod and the inner wall of the hollow metal outer body; for further safety, the contact gap is welded by adopting a welding method, so that the contact gap is completely sealed; the double sealing mode can ensure that the complete sealing of the contact gap is more firm;
thirdly, after a tiny hard plastic rod is inserted into the rectangular grooves on the left side, the right side and the bottom of the solid metal inner body, the solid metal inner body inserted with the tiny hard plastic rod is assembled into the hollow metal outer body by using a hammering or pressing machine, and as the size of the rectangular groove is slightly smaller than that of the tiny hard plastic rod, extrusion force is necessarily generated between the tiny hard plastic rod and the rectangular groove and between the tiny hard plastic rod and the inner wall of the hollow metal outer body, and contact gaps are completely sealed by virtue of the extrusion force between the tiny hard plastic rod and the rectangular groove and between the tiny hard plastic rod and the inner wall of the hollow metal outer body; for further safety, the contact gap is fully sealed by filling strong glue in the contact gap, and the double sealing mode can enable the complete sealing of the contact gap to be firmer.
The bottom of the solid metal inner body is provided with a groove, and the groove on the left side or the right side is arranged according to the situation.
The rectangular fine gap (3) is arranged on the outer wall of the solid metal inner body (2) or the inner wall of the hollow metal outer body (1).
The hollow metal outer body and the solid metal inner body are made of stainless steel or other metals.
The fine hard plastic rod is made of polytetrafluoroethylene or other materials.
The beneficial effects of the invention are as follows: the laminar flow element has the characteristics of high reliability, simple processing technology, small number of parts and simple structure, is suitable for small flow, forms stable laminar flow, is suitable for higher fluid pressure, and has low cost.
Drawings
FIG. 1 is a schematic view of a laminar flow member according to the present invention;
FIG. 2 is a schematic plan view of a laminar flow member of the present invention at a fluid inlet;
FIG. 3 is a schematic view of the solid metal inner body of the laminar flow member of the present invention;
fig. 4 is a front view of a solid metal inner body of a laminar flow member according to the present invention.
Fig. 5 is a top view of a solid metal inner body of a laminar flow member according to the present invention.
Fig. 6 is a left side view of a solid metal inner body of a laminar flow member according to the present invention.
Fig. 7 is a schematic view of the K-K section in fig. 5.
FIG. 8 is a schematic view of the rectangular fine slit opening on the inner wall of the hollow metal outer body of the laminar flow channel of the present invention.
Fig. 9 is a schematic diagram showing a structure of the laminar flow channel of the present invention, in which not only 1 but also a plurality of rectangular fine slits are provided.
Detailed Description
The invention will be further described with reference to the accompanying drawings, wherein the examples are given solely for the purpose of illustration and are merely representative of selected embodiments of the invention and are not intended to limit the scope of the invention as claimed.
As shown in fig. 1, a fine slit type laminar flow element comprises a hollow metal outer body (1), a solid metal inner body (2) and one or more fine hard plastic rods, wherein the hollow metal outer body (1) is tightly matched with the solid metal inner body (2), a slit formed by contact is subjected to sealing treatment, and a rectangular fine slit (3) is arranged at the same time; the rectangular fine gap (3) is a laminar flow channel; one or more rectangular grooves are formed in the left side, the right side and the bottom of the solid metal inner body (2); the outer vertical surface of the groove is contacted with the hollow metal outer body (1), and a tiny hard plastic rod is inserted into each rectangular groove and is contacted with the hollow metal outer body (1).
The number of the rectangular grooves at the left side, the right side and the bottom of the solid metal inner body (2) is equal or unequal.
The whole appearance of the hollow metal outer body (1) is a hollow cuboid, the outer contour of the cross section of the hollow metal outer body is rectangular, and the contour of the hollow part is rectangular.
As shown in FIG. 2, the rectangle formed by A-B-C-D-A is a rectangle micro gap, the fluid flows through the rectangle micro gap (3) in a laminar flow state, and the rectangle micro gap (3) is more than or equal to one.
As shown in fig. 3, 4, 5, 6 and 7, the solid metal inner body is provided with 1 or more rectangular grooves at the left side, the right side and the bottom, and the size of the rectangular grooves is slightly smaller than that of the small hard plastic rods. A thin hard plastic rod is inserted into the rectangular groove.
The dimensions of the a-E-F-G-H-D faces of the hollow metal outer body should be exactly equal to those of the a-E-F-G-H-D faces of the solid metal inner body, and the dimensions of the a-E-F-G-H-D faces of the solid metal inner body may be slightly smaller than those of the a-E-F-G-H-D faces of the hollow metal outer body in view of convenience in assembling the hollow metal outer body with the solid metal inner body.
As shown in FIG. 2, for the laminar flow member to be successfully machined, it is critical that the contact gap A-E-F-G-H-D formed by the hollow metal outer body (1) and the solid metal inner body (2) should be completely sealed and no fluid should flow through the gap of the contact gap A-E-F-G-H-D.
In order to achieve a complete sealing of the contact gap A-E-F-G-H-D, the invention provides a seal in one of the following ways:
firstly, after a tiny hard plastic rod is inserted into rectangular grooves on the left side, the right side and the bottom of a solid metal inner body, the solid metal inner body inserted with the tiny hard plastic rod is assembled into a hollow metal outer body by using a hammering or pressing machine, and as the size of the rectangular groove is slightly smaller than that of the tiny hard plastic rod, extrusion force is necessarily generated between the tiny hard plastic rod and the rectangular groove and between the tiny hard plastic rod and the inner wall of the hollow metal outer body, and contact gaps A-E-F-G-H-D are completely sealed by virtue of the extrusion force between the tiny hard plastic rod and the rectangular groove and between the tiny hard plastic rod and the inner wall of the hollow metal outer body;
secondly, after a tiny hard plastic rod is inserted into rectangular grooves on the left side, the right side and the bottom of the solid metal inner body, the solid metal inner body inserted with the tiny hard plastic rod is assembled into the hollow metal outer body by using a hammering or pressing machine, and as the size of the rectangular groove is slightly smaller than that of the tiny hard plastic rod, extrusion force is necessarily generated between the tiny hard plastic rod and the rectangular groove and between the tiny hard plastic rod and the inner wall of the hollow metal outer body, and contact gaps A-E-F-G-H-D are completely sealed by virtue of the extrusion force between the tiny hard plastic rod and the rectangular groove and between the tiny hard plastic rod and the inner wall of the hollow metal outer body; for further safety, the contact gaps A-E-F-G-H-D are welded by adopting a welding method, so that the contact gaps A-E-F-G-H-D are completely sealed; the double sealing mode can ensure that the complete sealing of the contact gaps A-E-F-G-H-D is more firm;
thirdly, after a tiny hard plastic rod is inserted into rectangular grooves on the left side, the right side and the bottom of the solid metal inner body, the solid metal inner body inserted with the tiny hard plastic rod is assembled into the hollow metal outer body by using a hammering or pressing machine, and as the size of the rectangular groove is slightly smaller than that of the tiny hard plastic rod, extrusion force is necessarily generated between the tiny hard plastic rod and the rectangular groove and between the tiny hard plastic rod and the inner wall of the hollow metal outer body, and contact gaps A-E-F-G-H-D are completely sealed by virtue of the extrusion force between the tiny hard plastic rod and the rectangular groove and between the tiny hard plastic rod and the inner wall of the hollow metal outer body; for further safety, the contact gap A-E-F-G-H-D is completely sealed by filling strong glue in the contact gap A-E-F-G-H-D, and the double sealing mode can ensure that the contact gap A-E-F-G-H-D is completely sealed more firmly.
One of the above methods is selected such that the contact gaps a-E-F-G-H-D are completely sealed, so that fluid can flow only in a laminar state from the rectangular fine gaps a-B-C-D-a.
The bottom of the solid metal inner body is provided with a groove, and the groove on the left side or the right side is arranged according to the situation.
As shown in fig. 2 and 8, the rectangular fine slit (3) is arranged on the outer wall of the solid metal inner body (2) or the inner wall of the hollow metal outer body (1).
The hollow metal outer body and the solid metal inner body can be made of stainless steel or other metals.
The fine hard plastic rod is made of polytetrafluoroethylene or other materials.
Example 1:
as shown in fig. 1, 2, 3, 4, 5, 6 and 7, the fine slit type laminar flow element comprises a hollow metal outer body, a solid metal inner body which is tightly matched with the hollow metal outer body to form a fine slit type laminar flow channel, and 9 fine hard plastic rods.
The left side, the right side and the bottom of the solid metal inner body are respectively provided with 3 rectangular grooves, 9 grooves are all arranged, 1 tiny hard plastic rod is inserted into each groove, and 9 tiny hard plastic rods are inserted into each groove.
Rectangular fine gaps, which can be used for fluid to flow in a laminar state, are formed between the hollow metal outer body and the solid metal inner body, and the length of the rectangular fine gaps is 2.5 mm, and the width of the rectangular fine gaps is 0.2 mm.
The hollow metal outer body has an overall appearance of a hollow cuboid, the outer contour of the cross section of which is rectangular, the rectangular is 26 mm long and 22 mm wide, and the height of the hollow cuboid in the fluid flow direction is 50 mm. The cross section of the fluid inlet of the solid metal inner body is rectangular with rectangular fine slits (the rectangular fine slits are actually laminar flow channels), and the cross section of the fluid inlet of the solid metal inner body is rectangular with the length of 16 mm and the width of 15 mm.
The lengths of the rectangular grooves on the left side, the right side and the bottom of the solid metal inner body in the fluid flow direction are 44 mm respectively, and it is noted that the length of the rectangular groove in the fluid flow direction is 44 mm less than the height of the hollow cuboid in the fluid flow direction by 50 mm. The cross section size of the rectangular groove is 2.8 mm long, the width of the rectangular groove is 2.5 mm, the diameter of the tiny hard plastic rod is 3 mm, and the cross section size of the rectangular groove is slightly smaller than the size of the tiny hard plastic rod.
As shown in FIG. 2, the rectangle formed by A-B-C-D-A is a rectangular fine slit through which the fluid flows in a laminar flow.
The dimensions of the a-E-F-G-H-D faces of the hollow metal outer body should be exactly equal to those of the a-E-F-G-H-D faces of the solid metal inner body, and the dimensions of the a-E-F-G-H-D faces of the solid metal inner body may be slightly smaller than those of the a-E-F-G-H-D faces of the hollow metal outer body in view of convenience in assembling the hollow metal outer body with the solid metal inner body.
As shown in FIG. 2, for the laminar flow member to be successfully machined, it is critical that the contact gap A-E-F-G-H-D formed by the hollow metal outer body (1) and the solid metal inner body (2) should be completely sealed and no fluid should flow through the gap of the contact gap A-E-F-G-H-D.
In order to ensure that the contact gap A-E-F-G-H-D formed by the hollow metal outer body and the solid metal inner body is completely sealed, the following method is adopted to realize: after 9 tiny hard plastic rods are plugged into grooves on the left side, the right side and the bottom of the solid metal inner body, the solid metal inner body plugged with the tiny hard plastic rods is assembled into the hollow metal outer body by using a hammering or pressing machine, and as the size of the rectangular groove is slightly smaller than that of the tiny hard plastic rods, extrusion force is necessarily generated between the tiny hard plastic rods and the rectangular groove and between the tiny hard plastic rods and the inner wall of the hollow metal outer body, and contact gaps A-E-F-G-H-D are completely sealed by virtue of the extrusion force between the tiny hard plastic rods and the rectangular groove and between the tiny hard plastic rods and the inner wall of the hollow metal outer body; the method can completely seal the contact gaps A-E-F-G-H-D, and fluid can only flow in a laminar state from the rectangular fine gaps A-B-C-D-A.
The hollow metal outer body and the solid metal inner body are made of stainless steel.
Table 1 shows the test cases of the tightness of the laminar flow member of this embodiment.
TABLE 1 test results (1)
( And (3) injection: the flow in the table is the flow under the standard condition, and the tested working medium is air )
As can be seen from Table 1, after the fluid enters the laminar flow member, the fluid only flows through the laminar flow channel, and the flow rate of the fluid flowing through the contact gap A-E-F-G-H-D is zero, which indicates that the sealing performance of the laminar flow member contact gap A-E-F-G-H-D is excellent.
Example 2:
as shown in fig. 1, 2, 3, 4, 5, 6 and 7, the fine slit type laminar flow element comprises a hollow metal outer body, a solid metal inner body which is tightly matched with the hollow metal outer body to form a fine slit type laminar flow channel, and 6 fine hard plastic rods.
The left side, the right side and the bottom of the solid metal inner body are respectively provided with 2 rectangular grooves, and 6 rectangular grooves are totally arranged, 1 tiny hard plastic rod is inserted into each groove, and 6 tiny hard plastic rods are totally inserted into each groove.
Rectangular fine gaps, which can be used for fluid to flow in a laminar state, are formed between the hollow metal outer body and the solid metal inner body, and the length of the rectangular fine gaps is 2.5 mm, and the width of the rectangular fine gaps is 0.2 mm.
The hollow metal outer body has an overall appearance of a hollow cuboid, the outer contour of the cross section of which is rectangular, the rectangular is 26 mm long and 22 mm wide, and the height of the hollow cuboid in the fluid flow direction is 50 mm. The cross section of the fluid inlet of the solid metal inner body is rectangular with rectangular fine slits (the rectangular fine slits are actually laminar flow channels), and the cross section of the fluid inlet of the solid metal inner body is rectangular with the length of 16 mm and the width of 15 mm.
The lengths of the rectangular grooves on the left side, the right side and the bottom of the solid metal inner body in the fluid flow direction are 44 mm respectively, and it is noted that the length of the rectangular groove in the fluid flow direction is 44 mm smaller than the height of the hollow cuboid in the fluid flow direction by 50 mm, the cross section size of the rectangular groove is 2.8 mm long and 2.5 mm wide, the diameter of the fine hard plastic rod is 3 mm, and the cross section size of the rectangular groove is slightly smaller than the size of the fine hard plastic rod.
As shown in FIG. 2, the rectangle formed by A-B-C-D-A is a rectangular fine slit through which the fluid flows in a laminar flow.
The dimensions of the a-E-F-G-H-D faces of the hollow metal outer body should be exactly equal to those of the a-E-F-G-H-D faces of the solid metal inner body, and the dimensions of the a-E-F-G-H-D faces of the solid metal inner body may be slightly smaller than those of the a-E-F-G-H-D faces of the hollow metal outer body in view of convenience in assembling the hollow metal outer body with the solid metal inner body.
As shown in FIG. 2, for the laminar flow member to be successfully machined, it is critical that the contact gap A-E-F-G-H-D formed by the hollow metal outer body (1) and the solid metal inner body (2) should be completely sealed and no fluid should flow through the gap of the contact gap A-E-F-G-H-D.
In order to ensure that the contact gap A-E-F-G-H-D formed by the hollow metal outer body and the solid metal inner body is completely sealed, the following method is adopted to realize: after 6 tiny hard plastic rods are plugged into grooves on the left side, the right side and the bottom of the solid metal inner body, the solid metal inner body plugged with the tiny hard plastic rods is assembled into the hollow metal outer body by using a hammering or pressing machine, and as the size of the rectangular groove is slightly smaller than that of the tiny hard plastic rods, extrusion force is necessarily generated between the tiny hard plastic rods and the rectangular groove and between the tiny hard plastic rods and the inner wall of the hollow metal outer body, and contact gaps A-E-F-G-H-D are completely sealed by virtue of the extrusion force between the tiny hard plastic rods and the rectangular groove and between the tiny hard plastic rods and the inner wall of the hollow metal outer body; for further safety, the contact gaps A-E-F-G-H-D are welded by adopting a welding method, so that the contact gaps A-E-F-G-H-D are completely sealed; the double sealing mode can ensure that the complete sealing of the contact gaps A-E-F-G-H-D is more firm; the method can completely seal the contact gaps A-E-F-G-H-D, and fluid can only flow in a laminar state from the rectangular fine gaps A-B-C-D-A.
The hollow metal outer body and the solid metal inner body are made of stainless steel.
Table 2 shows the test cases of the tightness of the laminar flow member of this embodiment.
TABLE 2 test results (2)
( And (3) injection: the flow in the table is the flow under the standard condition, and the tested working medium is air )
As can be seen from Table 2, after the fluid enters the laminar flow member, the fluid only flows through the laminar flow channel, and the flow rate of the fluid flowing through the contact gap A-E-F-G-H-D is zero, which indicates that the sealing performance of the laminar flow member contact gap A-E-F-G-H-D is excellent.
Example 3:
as shown in fig. 1, 2, 3, 4, 5, 6 and 7, the fine slit type laminar flow element comprises a hollow metal outer body, a solid metal inner body which is tightly matched with the hollow metal outer body to form a fine slit type laminar flow channel, and 6 fine hard plastic rods.
The left side, the right side and the bottom of the solid metal inner body are respectively provided with 2 rectangular grooves, and 6 grooves are totally arranged, 1 tiny hard plastic rod is inserted into each groove, and 6 tiny hard plastic rods are totally inserted into each groove.
Rectangular fine gaps, which can be used for fluid to flow in a laminar state, are formed between the hollow metal outer body and the solid metal inner body, and the length of the rectangular fine gaps is 2.5 mm, and the width of the rectangular fine gaps is 0.2 mm.
The hollow metal outer body has an overall appearance of a hollow cuboid, the outer contour of the cross section of which is rectangular, the rectangular is 26 mm long and 22 mm wide, and the height of the hollow cuboid in the fluid flow direction is 50 mm. The cross section of the fluid inlet of the solid metal inner body is rectangular with rectangular fine slits (the rectangular fine slits are actually laminar flow channels), and the cross section of the fluid inlet of the solid metal inner body is rectangular with the length of 16 mm and the width of 15 mm.
The lengths of the rectangular grooves on the left side, the right side and the bottom of the solid metal inner body in the fluid flow direction are 44 mm respectively, and it is noted that the length of the rectangular groove in the fluid flow direction is 44 mm smaller than the height of the hollow cuboid in the fluid flow direction by 50 mm, the cross section size of the rectangular groove is 2.8 mm long and 2.5 mm wide, the diameter of the fine hard plastic rod is 3 mm, and the cross section size of the rectangular groove is slightly smaller than the size of the fine hard plastic rod.
As shown in FIG. 2, the rectangle formed by A-B-C-D-A is a rectangular fine slit through which the fluid flows in a laminar flow.
The dimensions of the a-E-F-G-H-D faces of the hollow metal outer body should be exactly equal to those of the a-E-F-G-H-D faces of the solid metal inner body, and the dimensions of the a-E-F-G-H-D faces of the solid metal inner body may be slightly smaller than those of the a-E-F-G-H-D faces of the hollow metal outer body in view of convenience in assembling the hollow metal outer body with the solid metal inner body.
As shown in FIG. 2, for the laminar flow member to be successfully machined, it is critical that the contact gap A-E-F-G-H-D formed by the hollow metal outer body (1) and the solid metal inner body (2) should be completely sealed and no fluid should flow through the gap of the contact gap A-E-F-G-H-D.
In order to ensure that the contact gap A-E-F-G-H-D formed by the hollow metal outer body and the solid metal inner body is completely sealed, the following method is adopted to realize: after 6 tiny hard plastic rods are plugged into grooves on the left side, the right side and the bottom of the solid metal inner body, the solid metal inner body plugged with the tiny hard plastic rods is assembled into the hollow metal outer body by using a hammering or pressing machine, and as the size of the rectangular groove is slightly smaller than that of the tiny hard plastic rods, extrusion force is necessarily generated between the tiny hard plastic rods and the rectangular groove and between the tiny hard plastic rods and the inner wall of the hollow metal outer body, and contact gaps A-E-F-G-H-D are completely sealed by virtue of the extrusion force between the tiny hard plastic rods and the rectangular groove and between the tiny hard plastic rods and the inner wall of the hollow metal outer body; for further safety, the contact gap A-E-F-G-H-D is completely sealed by filling strong glue in the contact gap A-E-F-G-H-D, and the double sealing mode can ensure that the contact gap A-E-F-G-H-D is completely sealed more firmly. The method can completely seal the contact gaps A-E-F-G-H-D, and fluid can only flow in a laminar state from the rectangular fine gaps A-B-C-D-A.
The hollow metal outer body and the solid metal inner body are made of stainless steel.
Table 3 shows the test cases of the tightness of the laminar flow member of this embodiment.
TABLE 3 test results (3)
( And (3) injection: the flow in the table is the flow under the standard condition, and the tested working medium is air )
As can be seen from Table 3, after the fluid enters the laminar flow member, the fluid only flows through the laminar flow channel, and the flow rate of the fluid flowing through the contact gap A-E-F-G-H-D is zero, which indicates that the sealing performance of the laminar flow member contact gap A-E-F-G-H-D is excellent.
Example 4:
as shown in fig. 1, 2, 3, 4, 5, 6 and 7, the fine slit type laminar flow element comprises a hollow metal outer body, a solid metal inner body which is tightly matched with the hollow metal outer body to form a fine slit type laminar flow channel, and 3 fine hard plastic rods.
Because only 3 tiny hard plastic rods are plugged into the bottom of the solid metal inner body, rectangular grooves are not formed in the left side and the right side of the solid metal inner body, 3 rectangular grooves are formed in the bottom of the solid metal inner body, 1 tiny hard plastic rod is plugged into each groove, and 3 tiny hard plastic rods are plugged into the grooves.
Rectangular fine gaps, which can be used for fluid to flow in a laminar state, are formed between the hollow metal outer body and the solid metal inner body, and the length of the rectangular fine gaps is 2.5 mm, and the width of the rectangular fine gaps is 0.2 mm.
The hollow metal outer body has an overall appearance of a hollow cuboid, the outer contour of the cross section of which is rectangular, the rectangular is 26 mm long and 22 mm wide, and the height of the hollow cuboid in the fluid flow direction is 50 mm. The cross section of the fluid inlet of the solid metal inner body is rectangular with rectangular fine slits (the rectangular fine slits are actually laminar flow channels), and the cross section of the fluid inlet of the solid metal inner body is rectangular with the length of 16 mm and the width of 15 mm.
The length of the rectangular groove at the bottom of the solid metal inner body in the fluid flow direction is 44 mm respectively, and it is noted that the length of the rectangular groove in the fluid flow direction is 44 mm smaller than the height of the hollow cuboid in the fluid flow direction by 50 mm, the cross-sectional dimension of the rectangular groove is 2.8 mm, the width is 2.5 mm, the diameter of the fine hard plastic rod is 3 mm, and the cross-sectional dimension of the rectangular groove is slightly smaller than the dimension of the fine hard plastic rod.
As shown in FIG. 2, the rectangle formed by A-B-C-D-A is a rectangular fine slit through which the fluid flows in a laminar flow.
The dimensions of the a-E-F-G-H-D faces of the hollow metal outer body should be exactly equal to those of the a-E-F-G-H-D faces of the solid metal inner body, and the dimensions of the a-E-F-G-H-D faces of the solid metal inner body may be slightly smaller than those of the a-E-F-G-H-D faces of the hollow metal outer body in view of convenience in assembling the hollow metal outer body with the solid metal inner body.
As shown in FIG. 2, for the laminar flow member to be successfully machined, it is critical that the contact gap A-E-F-G-H-D formed by the hollow metal outer body (1) and the solid metal inner body (2) should be completely sealed and no fluid should flow through the gap of the contact gap A-E-F-G-H-D.
In order to ensure that the contact gap A-E-F-G-H-D formed by the hollow metal outer body and the solid metal inner body is completely sealed, the following method is adopted to realize: after 3 fine hard plastic rods are inserted into 3 grooves at the bottom of the solid metal inner body, the solid metal inner body inserted with the fine hard plastic rods is assembled into the hollow metal outer body by hammering or a pressing machine, and as the size of the rectangular groove is slightly smaller than that of the fine hard plastic rods, extrusion force is necessarily generated between the fine hard plastic rods and the rectangular groove and between the fine hard plastic rods and the inner wall of the hollow metal outer body, and contact gaps A-E-F-G-H-D are completely sealed by virtue of the extrusion force between the fine hard plastic rods and the rectangular groove and between the fine hard plastic rods and the inner wall of the hollow metal outer body; for further safety, the contact gaps A-E-F-G-H-D are welded by adopting a welding method, so that the contact gaps A-E-F-G-H-D are completely sealed; the double sealing mode can ensure that the complete sealing of the contact gaps A-E-F-G-H-D is more firm; the method can completely seal the contact gaps A-E-F-G-H-D, and fluid can only flow in a laminar state from the rectangular fine gaps A-B-C-D-A.
The hollow metal outer body and the solid metal inner body are made of stainless steel.
Table 4 shows the test cases of the tightness of the laminar flow member of this embodiment.
TABLE 4 test results (4)
( And (3) injection: the flow in the table is the flow under the standard condition, and the tested working medium is air )
As can be seen from Table 4, after the fluid enters the laminar flow member, the fluid only flows through the laminar flow channel, and the flow rate of the fluid flowing through the contact gap A-E-F-G-H-D is zero, which indicates that the sealing performance of the laminar flow member contact gap A-E-F-G-H-D is excellent.
Example 5:
referring to fig. 8, 1 in fig. 8 is a hollow metal outer body, 2 is a solid metal inner body, and 3 is a rectangular fine slit formed between the hollow metal outer body and the solid metal inner body for allowing fluid to pass through in a laminar flow state. The other parts of this embodiment are the same as embodiment 1 except that the rectangular fine slit through which the fluid flows in a laminar flow manner is opened not on the solid metal inner body but on the inner wall of the hollow metal outer body;
example 6:
referring to fig. 8, 1 in fig. 8 is a hollow metal outer body, 2 is a solid metal inner body, and 3 is a rectangular fine slit formed between the hollow metal outer body and the solid metal inner body for allowing fluid to pass through in a laminar flow state. Other portions of this embodiment are the same as embodiment 2 except that the rectangular fine slit through which the fluid flows in a laminar flow manner is opened not on the solid metal inner body but on the inner wall of the hollow metal outer body;
example 7:
referring to fig. 8, 1 in fig. 8 is a hollow metal outer body, 2 is a solid metal inner body, and 3 is a rectangular fine slit formed between the hollow metal outer body and the solid metal inner body for allowing fluid to pass through in a laminar flow state. The other parts of this embodiment are the same as embodiment 3 except that the rectangular fine slit through which the fluid flows in a laminar flow manner is opened not on the solid metal inner body but on the inner wall of the hollow metal outer body;
example 8:
referring to fig. 8, 1 in fig. 8 is a hollow metal outer body, 2 is a solid metal inner body, and 3 is a rectangular fine slit formed between the hollow metal outer body and the solid metal inner body for allowing fluid to pass through in a laminar flow state. The other parts of this embodiment are the same as embodiment 4 except that the rectangular fine slit through which the fluid flows in a laminar flow manner is opened not on the solid metal inner body but on the inner wall of the hollow metal outer body;
example 9:
referring to fig. 9, 3, 4, and 5 are rectangular fine slits as laminar flow paths, and the other portions of the present embodiment are the same as those of embodiment 1, except that the number of rectangular fine slits as laminar flow paths may be 1 or more.
Claims (9)
1. The fine slit type laminar flow element comprises a hollow metal outer body (1), a solid metal inner body (2) and one or more fine hard plastic rods, and is characterized in that the hollow metal outer body (1) is tightly matched with the solid metal inner body (2), a slit formed by contact is subjected to sealing treatment, and a rectangular fine slit (3) is formed; the rectangular fine gap (3) is a laminar flow channel; one or more rectangular grooves are formed in the left side, the right side and the bottom of the solid metal inner body (2); the outer vertical surface of the groove is contacted with the hollow metal outer body (1), and a tiny hard plastic rod is inserted into each rectangular groove and is contacted with the hollow metal outer body (1).
2. The fine gap laminar flow member according to claim 1, characterized in that the number of rectangular grooves on the left side, right side and bottom of the solid metal inner body (2) is equal or unequal.
3. The fine slit type laminar flow member according to claim 1, wherein the hollow metal outer body (1) has an overall shape of a hollow rectangular parallelepiped, an outer contour of a cross section thereof is rectangular, and a contour of a hollow portion is rectangular.
4. The fine slit type laminar flow member according to claim 1, wherein said rectangular fine slit (3) is equal to or more than one.
5. The fine gap laminar flow element according to claim 1, characterized in that the gap formed by the contact of the hollow metal outer body (1) and the solid metal inner body (2) is sealed by one of the following methods:
firstly, after a tiny hard plastic rod is inserted into rectangular grooves on the left side, the right side and the bottom of a solid metal inner body, the solid metal inner body inserted with the tiny hard plastic rod is assembled into a hollow metal outer body by using a hammering or pressing machine, and as the size of the rectangular groove is slightly smaller than that of the tiny hard plastic rod, extrusion force is necessarily generated between the tiny hard plastic rod and the rectangular groove and between the tiny hard plastic rod and the inner wall of the hollow metal outer body, and contact gaps are completely sealed by virtue of the extrusion force between the tiny hard plastic rod and the rectangular groove and between the tiny hard plastic rod and the inner wall of the hollow metal outer body;
secondly, after a tiny hard plastic rod is inserted into rectangular grooves on the left side, the right side and the bottom of the solid metal inner body, the solid metal inner body inserted with the tiny hard plastic rod is assembled into the hollow metal outer body by using a hammering or pressing machine, and as the size of the rectangular groove is slightly smaller than that of the tiny hard plastic rod, extrusion force is necessarily generated between the tiny hard plastic rod and the rectangular groove and between the tiny hard plastic rod and the inner wall of the hollow metal outer body, and contact gaps are completely sealed by virtue of the extrusion force between the tiny hard plastic rod and the rectangular groove and between the tiny hard plastic rod and the inner wall of the hollow metal outer body; for further safety, the contact gap is welded by adopting a welding method, so that the contact gap is completely sealed; the double sealing mode can ensure that the complete sealing of the contact gap is more firm;
thirdly, after a tiny hard plastic rod is inserted into the rectangular grooves on the left side, the right side and the bottom of the solid metal inner body, the solid metal inner body inserted with the tiny hard plastic rod is assembled into the hollow metal outer body by using a hammering or pressing machine, and as the size of the rectangular groove is slightly smaller than that of the tiny hard plastic rod, extrusion force is necessarily generated between the tiny hard plastic rod and the rectangular groove and between the tiny hard plastic rod and the inner wall of the hollow metal outer body, and contact gaps are completely sealed by virtue of the extrusion force between the tiny hard plastic rod and the rectangular groove and between the tiny hard plastic rod and the inner wall of the hollow metal outer body; for further safety, the contact gap is fully sealed by filling strong glue in the contact gap, and the double sealing mode can enable the complete sealing of the contact gap to be firmer.
6. The fine gap laminar flow member according to claim 1, wherein the bottom of the solid metal inner body is provided with grooves, and the left or right grooves are provided according to circumstances.
7. The fine slit type laminar flow member according to claim 1, wherein the rectangular fine slit (3) is provided on the outer wall of the solid metal inner body (2) or the inner wall of the hollow metal outer body (1).
8. The fine gap laminar flow member according to claim 1, characterized in that said hollow metal outer body and said solid metal inner body are made of stainless steel or other metals.
9. The fine slit type laminar flow member according to claim 1, wherein said fine hard plastic rod is made of polytetrafluoroethylene.
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| US3918623A (en) * | 1974-05-07 | 1975-11-11 | Ebara Mfg | Method of joining by diffusion welding a hollow part of nonferrous metal onto the inner surface of a hollow part of ferrous metal |
| US7618480B2 (en) * | 2007-07-16 | 2009-11-17 | Flair Corporation | Filter assembly and method |
| CN103259241B (en) * | 2013-06-08 | 2015-09-16 | 江苏省电力公司扬州供电公司 | A kind of Memorability exempts from the processing technology of the seal closure dismantling power pipeline junction and special extruder head |
| CN107781549B (en) * | 2017-11-21 | 2019-09-06 | 航天材料及工艺研究所 | A kind of hollow metal sealing structure |
| CN109341787A (en) * | 2018-12-24 | 2019-02-15 | 西北工业大学 | Clearance type laminar flow element |
| CN111896061A (en) * | 2019-05-04 | 2020-11-06 | 陕西易度智能科技有限公司 | Small-flow laminar flow element |
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