CN113532568A - Fine-gap laminar flow element and sealing method - Google Patents
Fine-gap laminar flow element and sealing method Download PDFInfo
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- CN113532568A CN113532568A CN202110771600.8A CN202110771600A CN113532568A CN 113532568 A CN113532568 A CN 113532568A CN 202110771600 A CN202110771600 A CN 202110771600A CN 113532568 A CN113532568 A CN 113532568A
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- 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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Abstract
A fine slit type laminar flow element and a sealing method thereof, 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 and the solid metal inner body are tightly matched, and a gap formed by contact is sealed and is provided with a rectangular fine gap; the rectangular fine gap 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; the outer vertical surface of each groove is in contact with the hollow metal outer body, a small hard plastic rod is inserted into each rectangular groove, and the small hard plastic rods are in contact 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, small number of parts and simple structure, and is suitable for small flow and higher fluid pressure.
Description
Technical Field
The invention relates to flow measurement and control of fluid, in particular to a fine gap 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 the fluid flows through, a flow channel with a fine size must be arranged on the laminar flow element so that the fluid forms a laminar flow when flowing through the laminar flow element. Typically, a laminar flow member is fabricated using a capillary tube, however, fabricating a laminar flow member using a capillary tube has significant drawbacks. For example, the use of capillary tubes to make laminar flow elements is not suitable for small flow applications, and if capillary tubes are used to make small flow laminar flow elements, the diameter of the capillary tubes will become very small, which greatly increases the processing difficulty of the capillary tube laminar flow elements and the processing cost.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a fine-slit laminar flow element and a sealing method, and the fine-slit laminar flow element has the characteristics of simple assembly and processing technology, good sealing performance, high reliability, stable formed laminar flow, low cost, small number of parts and simple structure, and is suitable for small flow and high fluid pressure.
In order to achieve the purpose, the invention adopts the technical scheme that:
a slight gap type laminar flow component comprises a hollow metal outer body (1), a solid metal inner body (2) and one or more fine rigid plastic rods, wherein the hollow metal outer body (1) and the solid metal inner body (2) are tightly matched, a gap formed by contact is sealed, and meanwhile, a rectangular slight gap (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 each groove is in contact with the hollow metal outer body (1), a small hard plastic rod is inserted into each rectangular groove, and the small hard plastic rods are in contact with the hollow metal outer body (1).
The number of the rectangular grooves on the left side, the right side and the bottom of the solid metal inner body (2) is equal or different.
The hollow metal outer body (1) is 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 more than or equal to one.
The sealing treatment is carried out on a gap formed by the contact of the hollow metal outer body (1) and the solid metal inner body (2), and the sealing method is carried out by adopting one of the following modes:
the method comprises the steps that after a tiny hard plastic rod is inserted into rectangular grooves in 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 through hammering or a press machine, because the size of the rectangular groove is slightly smaller than that of the tiny hard plastic rod, extrusion force is inevitably 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 means 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 small hard plastic rods are inserted into the rectangular grooves in the left side, the right side and the bottom of the solid metal inner body, the solid metal inner body inserted with the small hard plastic rods is assembled into the hollow metal outer body by hammering or a press machine, because the size of the rectangular groove is slightly smaller than that of the small hard plastic rods, extrusion force is inevitably generated between the small hard plastic rods and the rectangular grooves and between the small hard plastic rods and the inner wall of the hollow metal outer body, and contact gaps are completely sealed by virtue of the extrusion force between the small hard plastic rods and the rectangular grooves and between the small hard plastic rods and the inner wall of the hollow metal outer body; for further insurance, welding the contact gap by adopting a welding method so as to completely seal the contact gap; the double sealing mode can ensure that the contact gap is completely sealed more firmly;
filling small hard plastic rods into rectangular grooves in the left side, the right side and the bottom of a solid metal inner body, and then assembling the solid metal inner body filled with the small hard plastic rods into a hollow metal outer body by using a hammering or a press machine, wherein extrusion force is inevitably generated between the small hard plastic rods and the rectangular grooves and between the small hard plastic rods and the inner wall of the hollow metal outer body as the size of the rectangular grooves is slightly smaller than that of the small hard plastic rods, and contact gaps are completely sealed by virtue of the extrusion force between the small hard plastic rods and the rectangular grooves and between the small hard plastic rods and the inner wall of the hollow metal outer body; for further insurance, the contact gap is completely sealed by filling super glue in the contact gap, and the complete sealing of the contact gap can be more reliable by the double sealing mode.
The bottom of the solid metal inner body is provided with a groove, and the left side or the right side of the groove is provided according to the situation.
The rectangular micro-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, and can also be made of other materials.
The invention has the beneficial effects that: the laminar flow element has the characteristics of high reliability, simple processing technology, less 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 structural view of a laminar flow member according to the present invention;
FIG. 2 is a schematic plan view of a laminar flow member according to the present invention at a fluid inlet;
FIG. 3 is a schematic structural view of a 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 the laminar flow member of 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 the laminar flow member of the present invention.
Fig. 7 is a schematic view of the K-K section in fig. 5.
Fig. 8 is a schematic structural view showing a structure in which a rectangular minute slit of a laminar flow channel of the present invention is opened on an inner wall of a hollow metal outer body.
Fig. 9 is a schematic structural diagram of the laminar flow channel according to the present invention, in which the number of the rectangular fine slits may be 1 or more.
Detailed Description
The present invention will be further described with reference to the following drawings, which are intended to illustrate only selected embodiments of the invention and not to limit the scope of the invention as claimed.
As shown in figure 1, a laminar flow element with fine gaps comprises a hollow metal outer body (1), a solid metal inner body (2) and one or more fine rigid plastic rods, wherein the hollow metal outer body (1) is tightly matched with the solid metal inner body (2), gaps formed by contact are sealed, and rectangular fine gaps (3) are 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 each groove is in contact with the hollow metal outer body (1), a small hard plastic rod is inserted into each rectangular groove, and the small hard plastic rods are in contact with the hollow metal outer body (1).
The number of the rectangular grooves on the left side, the right side and the bottom of the solid metal inner body (2) is equal or different.
The hollow metal outer body (1) is 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 fine slit, the fluid flows through the rectangle fine slit (3) in a laminar state, and the number of the rectangle fine slit (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 groove is slightly smaller than that of the fine hard plastic rod. And a small hard plastic rod is plugged into the rectangular groove.
The dimensions of the A-E-F-G-H-D surface of the hollow metal outer body and the A-E-F-G-H-D surface of the solid metal inner body should be completely equal, and the A-E-F-G-H-D surface of the solid metal inner body can be slightly smaller than the A-E-F-G-H-D surface of the hollow metal outer body in consideration of the convenience in assembling the hollow metal outer body and the solid metal inner body.
As shown in FIG. 2, the key to successful processing of laminar flow components is 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 contact gap A-E-F-G-H-D.
In order to achieve complete sealing of the contact gaps A-E-F-G-H-D, the invention performs sealing in one of the following ways:
the method comprises the steps that after a small hard plastic rod is inserted into rectangular grooves in the left side, the right side and the bottom of a solid metal inner body, the solid metal inner body inserted with the small hard plastic rod is assembled into a hollow metal outer body by hammering or a press machine, extrusion force is inevitably generated between the small hard plastic rod and the rectangular grooves and between the small hard plastic rod and the inner wall of the hollow metal outer body due to the fact that the size of the rectangular grooves is slightly smaller than that of the small hard plastic rod, and contact gaps A-E-F-G-H-D are completely sealed by means of the extrusion force between the small hard plastic rod and the rectangular grooves and between the small hard plastic rod and the inner wall of the hollow metal outer body;
secondly, after small hard plastic rods are inserted into the rectangular grooves in the left side, the right side and the bottom of the solid metal inner body, the solid metal inner body inserted with the small hard plastic rods is assembled into the hollow metal outer body by hammering or a press machine, because the size of the rectangular groove is slightly smaller than that of the small hard plastic rods, extrusion force is inevitably generated between the small hard plastic rods and the rectangular groove and between the small hard plastic rods and the inner wall of the hollow metal outer body, and the contact gaps A-E-F-G-H-D are completely sealed by virtue of the extrusion force between the small hard plastic rods and the rectangular groove and between the small hard plastic rods and the inner wall of the hollow metal outer body; for further insurance, welding the contact gap A-E-F-G-H-D by adopting a welding method, so that the contact gap A-E-F-G-H-D is completely sealed; the double sealing mode can ensure that the contact gap A-E-F-G-H-D is completely sealed more firmly;
thirdly, after small hard plastic rods are 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 small hard plastic rods is assembled into the hollow metal outer body by hammering or a press machine, because the size of the rectangular groove is slightly smaller than that of the small hard plastic rods, extrusion force is inevitably generated between the small hard plastic rods and the rectangular groove and between the small hard plastic rods and the inner wall of the hollow metal outer body, and the contact gaps A-E-F-G-H-D are completely sealed by virtue of the extrusion force between the small hard plastic rods and the rectangular groove and between the small hard plastic rods and the inner wall of the hollow metal outer body; for further insurance, the contact gap A-E-F-G-H-D is completely sealed by filling super glue in the contact gap A-E-F-G-H-D, and the complete sealing of the contact gap A-E-F-G-H-D is more reliable by the double sealing mode.
One of the above methods is selected so that the contact gaps A-E-F-G-H-D are completely sealed, and thus the fluid can flow through only the rectangular fine gaps A-B-C-D-A in a laminar flow.
The bottom of the solid metal inner body is provided with a groove, and the left side or the right side of the groove is provided according to the situation.
As shown in fig. 2 and 8, the rectangular micro-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 can be made of stainless steel or other metals.
The fine hard plastic rod is made of polytetrafluoroethylene, and can also be made of other materials.
Example 1:
as shown in fig. 1, 2, 3, 4, 5, 6 and 7, a fine gap 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 gap laminar flow channel, and 9 fine rigid plastic rods.
3 rectangular grooves are respectively formed in the left side, the right side and the bottom of the solid metal inner body, 9 grooves are formed in the left side, the right side and the bottom of the solid metal inner body, 1 small hard plastic rod is stuffed into each groove, and 9 small hard plastic rods are stuffed into each groove.
A rectangular fine gap through which a fluid can flow in a laminar flow state is formed between the hollow metal outer body and the solid metal inner body, and the rectangular fine gap has a length of 2.5 mm and a width of 0.2 mm.
The hollow metal outer body is a hollow cuboid, the outer contour of the cross section of the hollow metal outer body is a rectangle, the length of the rectangle is 26 mm, the width of the rectangle is 22 mm, and the height of the hollow cuboid in the fluid flowing direction is 50 mm. The cross-section of the fluid inlet of the solid metal inner body is a rectangle with a rectangular fine slit (the rectangular fine slit is actually a laminar flow channel), and the cross-section of the rectangular at the fluid inlet of the solid metal inner body has a length of 16 mm and a 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 respectively 44 mm, 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 is 50 mm. The length of the section of the rectangular groove is 2.8 mm, the width of the rectangular groove is 2.5 mm, the diameter of the small hard plastic rod is 3 mm, and the section of the rectangular groove is slightly smaller than the size of the small hard plastic rod.
As shown in fig. 2, a-B-C-D-a forms a rectangular shape as a rectangular fine slit through which the fluid flows in a laminar state.
The dimensions of the A-E-F-G-H-D surface of the hollow metal outer body and the A-E-F-G-H-D surface of the solid metal inner body should be completely equal, and the A-E-F-G-H-D surface of the solid metal inner body can be slightly smaller than the A-E-F-G-H-D surface of the hollow metal outer body in consideration of the convenience in assembling the hollow metal outer body and the solid metal inner body.
As shown in FIG. 2, the key to successful processing of laminar flow components is 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 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: after 9 small hard plastic rods are plugged into the 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 small hard plastic rods is assembled into the hollow metal outer body by hammering or a press machine, extrusion force is inevitably generated between the small hard plastic rods and the rectangular grooves and between the small hard plastic rods and the inner wall of the hollow metal outer body as the size of the rectangular grooves is slightly smaller than that of the small hard plastic rods, and the contact gaps A-E-F-G-H-D are completely sealed by virtue of the extrusion force between the small hard plastic rods and the rectangular grooves and between the small hard plastic rods and the inner wall of the hollow metal outer body; the method can ensure that the contact gaps A-E-F-G-H-D are completely sealed, and the fluid can only flow through the rectangular fine gaps A-B-C-D-A in a laminar flow state.
The hollow metal outer body and the solid metal inner body are made of stainless steel.
Table 1 shows the test conditions of the sealing performance of the laminar flow member of this example.
TABLE 1 test results (1)
(Note: the flow in the upper table is the flow under the standard condition, the working medium tested is air)
As can be seen from Table 1, after the fluid enters the laminar flow element, 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 laminar flow element has excellent sealing performance in contact with the contact gap A-E-F-G-H-D.
Example 2:
as shown in fig. 1, 2, 3, 4, 5, 6, and 7, a laminar flow element with fine gaps comprises a hollow metal outer body, a solid metal inner body closely matched with the hollow metal outer body to form a laminar flow channel with fine gaps, and 6 fine rigid plastic rods.
2 rectangular grooves are respectively formed in the left side, the right side and the bottom of the solid metal inner body, 6 rectangular grooves are formed in the left side, the right side and the bottom of the solid metal inner body, 1 small hard plastic rod is stuffed into each groove, and 6 small hard plastic rods are stuffed into each groove.
A rectangular fine gap through which a fluid can flow in a laminar flow state is formed between the hollow metal outer body and the solid metal inner body, and the rectangular fine gap has a length of 2.5 mm and a width of 0.2 mm.
The hollow metal outer body is a hollow cuboid, the outer contour of the cross section of the hollow metal outer body is a rectangle, the length of the rectangle is 26 mm, the width of the rectangle is 22 mm, and the height of the hollow cuboid in the fluid flowing direction is 50 mm. The cross-section of the fluid inlet of the solid metal inner body is a rectangle with a rectangular fine slit (the rectangular fine slit is actually a laminar flow channel), and the cross-section of the rectangular at the fluid inlet of the solid metal inner body has a length of 16 mm and a 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 flowing direction are respectively 44 mm, and it is noted that the length 44 mm of the rectangular groove in the fluid flowing direction is smaller than the height 50 mm of the hollow cuboid in the fluid flowing direction, the sectional dimension of the rectangular groove is 2.8 mm, the width is 2.5 mm, the diameter of the small hard plastic rod is 3 mm, and the sectional dimension of the rectangular groove is slightly smaller than the size of the small hard plastic rod.
As shown in fig. 2, a-B-C-D-a forms a rectangular shape as a rectangular fine slit through which the fluid flows in a laminar state.
The dimensions of the A-E-F-G-H-D surface of the hollow metal outer body and the A-E-F-G-H-D surface of the solid metal inner body should be completely equal, and the A-E-F-G-H-D surface of the solid metal inner body can be slightly smaller than the A-E-F-G-H-D surface of the hollow metal outer body in consideration of the convenience in assembling the hollow metal outer body and the solid metal inner body.
As shown in FIG. 2, the key to successful processing of laminar flow components is 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 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: after 6 small hard plastic rods are plugged into the 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 small hard plastic rods is assembled into the hollow metal outer body by hammering or a press machine, extrusion force is inevitably generated between the small hard plastic rods and the rectangular grooves and between the small hard plastic rods and the inner wall of the hollow metal outer body due to the fact that the size of the rectangular grooves is slightly smaller than that of the small hard plastic rods, and the contact gaps A-E-F-G-H-D are completely sealed by means of the extrusion force between the small hard plastic rods and the rectangular grooves and between the small hard plastic rods and the inner wall of the hollow metal outer body; for further insurance, welding the contact gap A-E-F-G-H-D by adopting a welding method, so that the contact gap A-E-F-G-H-D is completely sealed; the double sealing mode can ensure that the contact gap A-E-F-G-H-D is completely sealed more firmly; the method can ensure that the contact gaps A-E-F-G-H-D are completely sealed, and the fluid can only flow through the rectangular fine gaps A-B-C-D-A in a laminar flow state.
The hollow metal outer body and the solid metal inner body are made of stainless steel.
Table 2 shows the test conditions of the sealing performance of the laminar flow member of this example.
TABLE 2 test results (2)
(Note: the flow in the upper table is the flow under the standard condition, the working medium tested is air)
As can be seen from Table 2, after the fluid enters the laminar flow element, 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 laminar flow element has excellent sealing performance in contact with the contact gap A-E-F-G-H-D.
Example 3:
as shown in fig. 1, 2, 3, 4, 5, 6, and 7, a laminar flow element with fine gaps comprises a hollow metal outer body, a solid metal inner body closely matched with the hollow metal outer body to form a laminar flow channel with fine gaps, and 6 fine rigid plastic rods.
2 rectangular grooves are respectively formed in the left side, the right side and the bottom of the solid metal inner body, 6 grooves are formed in the left side, the right side and the bottom of the solid metal inner body, 1 small hard plastic rod is stuffed into each groove, and 6 small hard plastic rods are stuffed into each groove.
A rectangular fine gap through which a fluid can flow in a laminar flow state is formed between the hollow metal outer body and the solid metal inner body, and the rectangular fine gap has a length of 2.5 mm and a width of 0.2 mm.
The hollow metal outer body is a hollow cuboid, the outer contour of the cross section of the hollow metal outer body is a rectangle, the length of the rectangle is 26 mm, the width of the rectangle is 22 mm, and the height of the hollow cuboid in the fluid flowing direction is 50 mm. The cross-section of the fluid inlet of the solid metal inner body is a rectangle with a rectangular fine slit (the rectangular fine slit is actually a laminar flow channel), and the cross-section of the rectangular at the fluid inlet of the solid metal inner body has a length of 16 mm and a 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 flowing direction are respectively 44 mm, and it is noted that the length 44 mm of the rectangular groove in the fluid flowing direction is smaller than the height 50 mm of the hollow cuboid in the fluid flowing direction, the sectional dimension of the rectangular groove is 2.8 mm, the width is 2.5 mm, the diameter of the small hard plastic rod is 3 mm, and the sectional dimension of the rectangular groove is slightly smaller than the size of the small hard plastic rod.
As shown in fig. 2, a-B-C-D-a forms a rectangular shape as a rectangular fine slit through which the fluid flows in a laminar state.
The dimensions of the A-E-F-G-H-D surface of the hollow metal outer body and the A-E-F-G-H-D surface of the solid metal inner body should be completely equal, and the A-E-F-G-H-D surface of the solid metal inner body can be slightly smaller than the A-E-F-G-H-D surface of the hollow metal outer body in consideration of the convenience in assembling the hollow metal outer body and the solid metal inner body.
As shown in FIG. 2, the key to successful processing of laminar flow components is 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 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: after 6 small hard plastic rods are plugged into the 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 small hard plastic rods is assembled into the hollow metal outer body by hammering or a press machine, extrusion force is inevitably generated between the small hard plastic rods and the rectangular grooves and between the small hard plastic rods and the inner wall of the hollow metal outer body due to the fact that the size of the rectangular grooves is slightly smaller than that of the small hard plastic rods, and the contact gaps A-E-F-G-H-D are completely sealed by means of the extrusion force between the small hard plastic rods and the rectangular grooves and between the small hard plastic rods and the inner wall of the hollow metal outer body; for further insurance, the contact gap A-E-F-G-H-D is completely sealed by filling super glue in the contact gap A-E-F-G-H-D, and the complete sealing of the contact gap A-E-F-G-H-D is more reliable by the double sealing mode. The method can ensure that the contact gaps A-E-F-G-H-D are completely sealed, and the fluid can only flow through the rectangular fine gaps A-B-C-D-A in a laminar flow state.
The hollow metal outer body and the solid metal inner body are made of stainless steel.
Table 3 shows the test conditions of the sealing performance of the laminar flow member of this example.
TABLE 3 test results (3)
(Note: the flow in the upper table is the flow under the standard condition, the working medium tested is air)
As can be seen from Table 3, after the fluid enters the laminar flow element, 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 laminar flow element has excellent sealing performance in contact with the contact gap A-E-F-G-H-D.
Example 4:
as shown in fig. 1, 2, 3, 4, 5, 6, and 7, a laminar flow element with fine gaps comprises a hollow metal outer body, a solid metal inner body closely matched with the hollow metal outer body to form a laminar flow channel with fine gaps, and 3 fine rigid plastic rods.
Only considering that 3 tiny hard plastic rods are stuffed in 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 stuffed in each groove, and 3 tiny hard plastic rods are stuffed in total.
A rectangular fine gap through which a fluid can flow in a laminar flow state is formed between the hollow metal outer body and the solid metal inner body, and the rectangular fine gap has a length of 2.5 mm and a width of 0.2 mm.
The hollow metal outer body is a hollow cuboid, the outer contour of the cross section of the hollow metal outer body is a rectangle, the length of the rectangle is 26 mm, the width of the rectangle is 22 mm, and the height of the hollow cuboid in the fluid flowing direction is 50 mm. The cross-section of the fluid inlet of the solid metal inner body is a rectangle with a rectangular fine slit (the rectangular fine slit is actually a laminar flow channel), and the cross-section of the rectangular at the fluid inlet of the solid metal inner body has a length of 16 mm and a width of 15 mm.
The lengths of the rectangular grooves at the bottom of the solid metal inner body in the fluid flowing direction are respectively 44 mm, and it is noted that the length 44 mm of the rectangular grooves in the fluid flowing direction is less than the height 50 mm of the hollow cuboid in the fluid flowing direction, the sectional dimension of the rectangular grooves is 2.8 mm, the width is 2.5 mm, the diameter of the small hard plastic rod is 3 mm, and the sectional dimension of the rectangular grooves is slightly smaller than the size of the small hard plastic rod.
As shown in fig. 2, a-B-C-D-a forms a rectangular shape as a rectangular fine slit through which the fluid flows in a laminar state.
The dimensions of the A-E-F-G-H-D surface of the hollow metal outer body and the A-E-F-G-H-D surface of the solid metal inner body should be completely equal, and the A-E-F-G-H-D surface of the solid metal inner body can be slightly smaller than the A-E-F-G-H-D surface of the hollow metal outer body in consideration of the convenience in assembling the hollow metal outer body and the solid metal inner body.
As shown in FIG. 2, the key to successful processing of laminar flow components is 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 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: after 3 tiny hard plastic rods are stuffed in 3 grooves at the bottom of the solid metal inner body, the solid metal inner body stuffed with the tiny hard plastic rods is assembled into the hollow metal outer body by hammering or a press machine, extrusion forces are inevitably generated between the tiny hard plastic rods and the rectangular grooves and between the tiny hard plastic rods and the inner wall of the hollow metal outer body as the size of the rectangular grooves is slightly smaller than that of the tiny hard plastic rods, and the contact gaps A-E-F-G-H-D are completely sealed by virtue of the extrusion forces between the tiny hard plastic rods and the rectangular grooves and between the tiny hard plastic rods and the inner wall of the hollow metal outer body; for further insurance, welding the contact gap A-E-F-G-H-D by adopting a welding method, so that the contact gap A-E-F-G-H-D is completely sealed; the double sealing mode can ensure that the contact gap A-E-F-G-H-D is completely sealed more firmly; the method can ensure that the contact gaps A-E-F-G-H-D are completely sealed, and the fluid can only flow through the rectangular fine gaps A-B-C-D-A in a laminar flow state.
The hollow metal outer body and the solid metal inner body are made of stainless steel.
Table 4 shows the test conditions of the sealing performance of the laminar flow member of this example.
TABLE 4 test results (4)
(Note: the flow in the upper table is the flow under the standard condition, the working medium tested is air)
As can be seen from Table 4, after the fluid enters the laminar flow element, 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 laminar flow element has excellent sealing performance in contact with the contact gap A-E-F-G-H-D.
Example 5:
referring to fig. 8, in fig. 8, 1 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 and through which a fluid can pass in a laminar flow state. The other parts of this example are the same as example 1 except that the rectangular fine slits through which the fluid flows in a laminar flow manner are opened not in the solid metal inner body but in the inner wall of the hollow metal outer body;
example 6:
referring to fig. 8, in fig. 8, 1 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 and through which a fluid can pass in a laminar flow state. The other parts of this example are the same as example 2, except that the rectangular fine slits through which the fluid flows in a laminar flow manner are opened not in the solid metal inner body but in the inner wall of the hollow metal outer body;
example 7:
referring to fig. 8, in fig. 8, 1 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 and through which a fluid can pass in a laminar flow state. The other parts of this example are the same as example 3, except that the rectangular fine slits through which the fluid flows in a laminar flow manner are opened not in the solid metal inner body but in the inner wall of the hollow metal outer body;
example 8:
referring to fig. 8, in fig. 8, 1 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 and through which a fluid can pass in a laminar flow state. The other parts of this example are the same as example 4 except that the rectangular fine slits through which the fluid flows in a laminar flow manner are opened not in the solid metal inner body but in 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 channels, but the present embodiment is the same as embodiment 1 except that the number of the rectangular fine slits as laminar flow channels may be 1 or more.
Claims (9)
1. A slight gap type laminar flow component comprises a hollow metal outer body (1), a solid metal inner body (2) and one or more slight hard plastic rods, and is characterized in that the hollow metal outer body (1) and the solid metal inner body (2) are tightly matched, and a gap formed by contact is sealed and is provided with a rectangular slight gap (3); 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 each groove is in contact with the hollow metal outer body (1), a small hard plastic rod is inserted into each rectangular groove, and the small hard plastic rods are in contact with the hollow metal outer body (1).
2. The laminar flow member with fine slits as claimed in claim 1, wherein the number of rectangular grooves on the left, right and bottom of said solid metal inner body (2) is equal or different.
3. A laminar flow element according to claim 1, characterized in that the hollow metal outer body (1) has an overall shape of a hollow rectangular parallelepiped, the outer contour of the cross section thereof is rectangular, and the contour of the hollow portion thereof is rectangular.
4. A laminar flow element according to claim 1, characterized in that said rectangular fine slit (3) is equal to or greater than one.
5. The laminar flow member with fine gaps according to claim 1, wherein the gap formed by the hollow metal outer body (1) contacting with the solid metal inner body (2) is sealed by one of the following methods:
the method comprises the steps that after a tiny hard plastic rod is inserted into rectangular grooves in 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 through hammering or a press machine, because the size of the rectangular groove is slightly smaller than that of the tiny hard plastic rod, extrusion force is inevitably 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 means 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 small hard plastic rods are inserted into the rectangular grooves in the left side, the right side and the bottom of the solid metal inner body, the solid metal inner body inserted with the small hard plastic rods is assembled into the hollow metal outer body by hammering or a press machine, because the size of the rectangular groove is slightly smaller than that of the small hard plastic rods, extrusion force is inevitably generated between the small hard plastic rods and the rectangular grooves and between the small hard plastic rods and the inner wall of the hollow metal outer body, and contact gaps are completely sealed by virtue of the extrusion force between the small hard plastic rods and the rectangular grooves and between the small hard plastic rods and the inner wall of the hollow metal outer body; for further insurance, welding the contact gap by adopting a welding method so as to completely seal the contact gap; the double sealing mode can ensure that the contact gap is completely sealed more firmly;
filling small hard plastic rods into rectangular grooves in the left side, the right side and the bottom of a solid metal inner body, and then assembling the solid metal inner body filled with the small hard plastic rods into a hollow metal outer body by using a hammering or a press machine, wherein extrusion force is inevitably generated between the small hard plastic rods and the rectangular grooves and between the small hard plastic rods and the inner wall of the hollow metal outer body as the size of the rectangular grooves is slightly smaller than that of the small hard plastic rods, and contact gaps are completely sealed by virtue of the extrusion force between the small hard plastic rods and the rectangular grooves and between the small hard plastic rods and the inner wall of the hollow metal outer body; for further insurance, the contact gap is completely sealed by filling super glue in the contact gap, and the complete sealing of the contact gap can be more reliable by the double sealing mode.
6. The laminar flow member according to claim 1, wherein the solid metal inner body has a groove at the bottom, and left or right grooves are provided as the case may be.
7. The laminar flow member of claim 1, wherein the rectangular fine slits (3) are formed on the outer wall of the inner metal body (2) or the inner wall of the outer metal body (1).
8. The laminar flow member according to claim 1, wherein the hollow metal outer body and the solid metal inner body are made of stainless steel or other metals.
9. A laminar flow member with fine gaps according to claim 1, wherein said fine rigid plastic rods are made of teflon or other materials.
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| GB1463937A (en) * | 1974-05-07 | 1977-02-09 | Ebara Mfg | Method of joining by diffusion welding a hollow part of non ferrous metal onto the inner surface of a hollow part of ferrous metal |
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| 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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|---|---|---|---|---|
| GB1463937A (en) * | 1974-05-07 | 1977-02-09 | Ebara Mfg | Method of joining by diffusion welding a hollow part of non ferrous metal onto the inner surface of a hollow part of ferrous metal |
| CA2691676A1 (en) * | 2007-07-16 | 2009-01-22 | Flair Corporation | Filter assembly with a top cap having a non-planar flange portion |
| CN103259241A (en) * | 2013-06-08 | 2013-08-21 | 国家电网公司 | High-memorability and dismounting-free seal cover at electric pipeline connecting part, processing technology and special extrusion head |
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