CN111553036A - Design method for pressing plate structure of plate heat exchanger - Google Patents
Design method for pressing plate structure of plate heat exchanger Download PDFInfo
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- CN111553036A CN111553036A CN202010372816.2A CN202010372816A CN111553036A CN 111553036 A CN111553036 A CN 111553036A CN 202010372816 A CN202010372816 A CN 202010372816A CN 111553036 A CN111553036 A CN 111553036A
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Abstract
The invention discloses a design method of a pressing plate structure of a plate heat exchanger, which comprises the following steps of pre-compression parameter test: simplifying the plate bundle into a rectangular elastic body, pre-pressing the plate bundle and a compression plate, and compressing the central deformation of the compression plate to obtain the compression plate material with the corresponding elastic modulus and the thickness of the compression plate; pre-compaction parameter test under water pressure: simplifying the plate bundle into a rectangular fluid cavity, combining the deformation amount of the center of the compression plate with the load on the compression plate during the hydrostatic test, and looking up a table to obtain the compression plate material corresponding to the elastic modulus and the thickness of the compression plate; and comparing the thicknesses of the pressing plates selected in the two previous steps, and selecting the maximum thickness as the design thickness of the pressing plate. The invention relates to a design calculation method for selecting a plate material and thickness by utilizing elastic deformation coordination of the material in different directions and controlling the micro-deformation of a compression plate during working through the elastic modulus of the material.
Description
Technical Field
The invention relates to the technical field of plate heat exchangers, in particular to a design method of a pressing plate structure of a plate heat exchanger.
Background
The plate heat exchanger is a device for heat exchange between cold and hot media, and is widely applied to various industries, such as petroleum, chemical industry, energy, metallurgy, aerospace and other fields. The design calculation of the hold-down plate, which is an important part of the plate heat exchanger for a long time, is a difficult problem, and at present, most of the methods which are adopted by experimental verification or selection based on experience seriously influence the reliability of the plate heat exchanger, so that the product is difficult to develop a new field.
Disclosure of Invention
The invention aims to provide a design method of a compression plate structure of a plate heat exchanger, which utilizes elastic deformation of materials in different directions as a criterion for design calculation, and obtains the material and the thickness of the compression plate by calculating the thickness after comparing the deformation coordination of the plate heat exchanger in a pre-compression state and a pressure test state.
The invention is realized by the following technical scheme in order to achieve the purpose:
a method of designing a plate heat exchanger hold-down plate structure comprising the steps of:
step (1), pre-compression parameter testing: simplifying the plate bundle to have E modulus of elasticity1A rectangular elastic body, wherein a rubber gasket fixed on the plate bundle is taken as a profile, the elastic modulus of the compression plate is E, the plate bundle and the compression plate are pre-compressed, and the central deformation Y of the compression plate with the length of a and the width of b is measured1Looking up a table to obtain a pressing plate material with the corresponding elastic modulus E and the thickness of the pressing plate corresponding to the section shape;
step (2), testing pre-compression parameters under water pressure: simplifying the plate bundle into a rectangular fluid cavity, increasing the pressure of the internal fluid borne by the pressure plate on the basis of pre-compression stress, and then changing the deformation quantity Y of the center of the pressure plate2Looking up a table to obtain a material corresponding to the compression plate with the elastic modulus E and the thickness of the compression plate corresponding to the section shape by combining the load q borne by the compression plate in the hydrostatic test;
and (3) comparing the thicknesses of the pressing plates in the step (1) and the step (2), and selecting the maximum thickness as the design thickness of the pressing plate.
Further, in the step (1), the central deformation Y of the pressing plate1Is calculated by the formula
In the formula, M0Bending moment M generated by the pretightening force of the bolt on the pressure plate in the width direction1Bending moment, I, generated by bolt pretightening force and internal pressure on the pressure plate1Is the moment of inertia of the cross section of the compacting plate in the width direction, I2The moment of inertia of the cross section of the compacting plate in the length direction is shown.
Further, in the step (2), the central deformation Y of the pressing plate2Is calculated by the formula
Wherein M is0Bending moment M generated by the pretightening force of the bolt on the pressure plate in the width direction1Bending moment, I, generated by bolt pretightening force and internal pressure on the pressure plate1Is the moment of inertia of the cross section of the compacting plate in the width direction, I2The moment of inertia of the cross section of the compression plate in the length direction is shown, and q is the load on the compression plate during the hydrostatic test.
Compared with the prior art, the technical scheme of the invention is a design calculation method for the pressing plate of the plate heat exchanger based on the plate static stiffness theory, and the plate material and thickness selection is carried out by utilizing the elastic deformation coordination of the material in different directions and controlling the micro-deformation amount of the pressing plate during working through the elastic modulus of the material. The calculation belongs to check calculation after setting the material and the section shape, the material determines the elastic modulus of the material, and the section shape determines the bending moment of inertia of the compression plate.
Drawings
FIG. 1 is a schematic view of a simplified model of a pre-compression test of a compression plate according to the present invention;
FIG. 2 is a schematic diagram of the stress of a simplified model of a hydraulic test of a pressure strip in the invention;
fig. 3 is a schematic view of the bulging deformation of the pressing plate under internal pressure in the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1 to 3, the method for designing a plate-type heat exchanger compression plate structure of the present invention comprises the following steps:
step (1), pre-compression parameter testing: simplifying the plate bundle to have E modulus of elasticity1A rectangular elastic body, wherein a rubber gasket fixed on the plate bundle is taken as a profile, the elastic modulus of the compression plate is E, the plate bundle and the compression plate are pre-compressed, and the central deformation Y of the compression plate with the length of a and the width of b is measured1Looking up a table to obtain a pressing plate material with the corresponding elastic modulus E and the thickness of the pressing plate corresponding to the section shape;
step (2), testing pre-compression parameters under water pressure: simplifying the plate bundle into a rectangular fluid cavity, increasing the pressure of the internal fluid borne by the pressure plate on the basis of pre-compression stress, and then changing the deformation quantity Y of the center of the pressure plate2And looking up a table by combining the load q borne by the pressing plate in the hydrostatic test to obtain the pressing plate material with the corresponding elastic modulus E and the thickness of the pressing plate corresponding to the section shape.
And (3) comparing the thicknesses of the pressing plates in the step (1) and the step (2), and selecting the maximum thickness as the design thickness of the pressing plate.
In the step (1), the central deformation Y of the pressing plate1Is calculated by the formula
In the formula, M0Bending moment M generated by the pretightening force of the bolt on the pressure plate in the width direction1Bending moment, I, generated by bolt pretightening force and internal pressure on the pressure plate1Is the moment of inertia of the cross section of the compacting plate in the width direction, I2The moment of inertia of the cross section of the compacting plate in the length direction is shown.
The pressing plate is parallel to the plate bundle under the action of the clamping bolts, meanwhile, the pressing plate is balanced with the acting force generated by the elastic body of the plate bundle in the elastic range, the stress of the pressing plate is simplified under the action of the bolts at two sides as shown in figure 1, the deformation as shown in figure 3 is generated, and the deformation angles in the length direction and the width direction are α respectively0、β0When calculating, tg α may be taken0、tgβ0Approximately equal to α0、β0Can be approximated by engineering, from which the deformation distance Y of the center of the pressure plate can be derived1。
In the step (2), the central deformation Y of the pressing plate2Is calculated by the formula
Wherein M is0Bending moment M generated by the pretightening force of the bolt on the pressure plate in the width direction1Bending moment, I, generated by bolt pretightening force and internal pressure on the pressure plate1Is the moment of inertia of the cross section of the compacting plate in the width direction, I2The moment of inertia of the cross section of the compression plate in the length direction is shown, and q is the load on the compression plate during the hydrostatic test.
On the basis of pre-compression test stress, internal fluid pressure is increased, at this time, although a part of stress of the compression plate is offset under the action of the internal fluid pressure, the compression plate generates moment actions in the length a direction and the width b direction under the action of bolt tension and internal pressure by taking the outline of the rubber gasket as a fulcrum, and intermediate bulging deformation, namely an angle α and an angle β are generated (as shown in fig. 3, the angle α and the angle β at this time are normally far larger than the angle α at the time of pre-tightening force)0Corner β0) The compression plate is ensured to be in the elastic range and meet the condition that tg α or tg β is approximately equal to α or β.
The embodiments of the present invention are merely illustrative and not restrictive, and those skilled in the art can modify the embodiments without inventive contribution as required after reading the present specification, but the present invention is protected by patent law within the scope of the appended claims.
Claims (3)
1. A method of designing a plate heat exchanger hold-down plate structure comprising the steps of:
step (1), pre-compression parameter testing: plate-to-plate heat exchangerThe plate bundle is simplified into E of elastic modulus1A rectangular elastic body, wherein a rubber gasket fixed on the plate bundle is taken as a profile, the elastic modulus of the compression plate is E, the plate bundle and the compression plate are pre-compressed, and the central deformation Y of the compression plate with the length of a and the width of b is measured1Looking up a table to obtain a pressing plate material with the corresponding elastic modulus E and the thickness of the pressing plate corresponding to the section shape;
step (2), testing pre-compression parameters under water pressure: simplifying the plate bundle into a rectangular fluid cavity, increasing the pressure of the internal fluid borne by the pressure plate on the basis of pre-compression stress, and then changing the deformation quantity Y of the center of the pressure plate2Looking up a table to obtain a material corresponding to the compression plate with the elastic modulus E and the thickness of the compression plate corresponding to the section shape by combining the load q borne by the compression plate in the hydrostatic test;
and (3) comparing the thicknesses of the pressing plates in the step (1) and the step (2), and selecting the maximum thickness as the design thickness of the pressing plate.
2. The method for designing a compression plate structure of a plate heat exchanger according to claim 1, wherein in the step (1), the compression plate center deformation amount Y1Is calculated by the formula
In the formula, M0Bending moment, M, produced on the sheet in the width direction for the elastic load of the sheet1Bending moment applied to the sheet in the width direction for the elastic load of the sheet, I1Is the moment of inertia of the cross section of the compacting plate in the width direction, I2The moment of inertia of the cross section of the compacting plate in the length direction is shown.
3. The plate heat exchanger compression plate structure design method of claim 1, wherein in step (2), the compression plate center deformation amount Y2Is calculated by the formula
Wherein M is0Bending moment M generated by the pretightening force of the bolt on the pressure plate in the width direction1Bending moment, I, generated by bolt pretightening force and internal pressure on the pressure plate1Is the moment of inertia of the cross section of the compacting plate in the width direction, I2The moment of inertia of the cross section of the compression plate in the length direction is shown, and q is the load on the compression plate during the hydrostatic test.
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| CN202010372816.2A CN111553036B (en) | 2020-05-06 | 2020-05-06 | Design method for pressing plate structure of plate heat exchanger |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103217135A (en) * | 2012-07-31 | 2013-07-24 | 兰州冠宇传热与节能工程技术研究有限公司 | Method for determining thickness of detachable plate heat exchanger keep plate |
| CN103258135A (en) * | 2013-05-24 | 2013-08-21 | 甘肃蓝科石化高新装备股份有限公司 | Method for determining thickness of detachable plate heat exchanger compression plate |
| CN204461164U (en) * | 2015-01-26 | 2015-07-08 | 上海艾克森集团有限公司 | A kind of two-part detachable plate type heat exchanger |
| US20150330036A1 (en) * | 2014-05-14 | 2015-11-19 | Paul David Dulieu | Protective Pad Assembly For Use With Motorized Compactor |
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2020
- 2020-05-06 CN CN202010372816.2A patent/CN111553036B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103217135A (en) * | 2012-07-31 | 2013-07-24 | 兰州冠宇传热与节能工程技术研究有限公司 | Method for determining thickness of detachable plate heat exchanger keep plate |
| CN103258135A (en) * | 2013-05-24 | 2013-08-21 | 甘肃蓝科石化高新装备股份有限公司 | Method for determining thickness of detachable plate heat exchanger compression plate |
| US20150330036A1 (en) * | 2014-05-14 | 2015-11-19 | Paul David Dulieu | Protective Pad Assembly For Use With Motorized Compactor |
| CN204461164U (en) * | 2015-01-26 | 2015-07-08 | 上海艾克森集团有限公司 | A kind of two-part detachable plate type heat exchanger |
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