CN112283422A - Torsional spring elasticity type automatic flow regulating valve - Google Patents

Torsional spring elasticity type automatic flow regulating valve Download PDF

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Publication number
CN112283422A
CN112283422A CN202011171121.4A CN202011171121A CN112283422A CN 112283422 A CN112283422 A CN 112283422A CN 202011171121 A CN202011171121 A CN 202011171121A CN 112283422 A CN112283422 A CN 112283422A
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China
Prior art keywords
ventilation
valve plate
plate
torsion spring
valve
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CN202011171121.4A
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Chinese (zh)
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CN112283422B (en
Inventor
赵亮
代中元
邓荣娟
许龙旭
孙志鹏
吴永哲
尤小平
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Tianjin Cement Industry Design and Research Institute Co Ltd
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Tianjin Cement Industry Design and Research Institute Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/20—Excess-flow valves
    • F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
    • F16K17/24—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
    • F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
    • F16K1/20—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation arranged externally of valve member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/54—Arrangements for modifying the way in which the rate of flow varies during the actuation of the valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/20—Excess-flow valves
    • F16K17/34—Excess-flow valves in which the flow-energy of the flowing medium actuates the closing mechanism
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/02—Construction of housing; Use of materials therefor of lift valves
    • F16K27/0209—Check valves or pivoted valves
    • F16K27/0227—Check valves or pivoted valves with the valve members swinging around an axis located at the edge of or outside the valve member

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Air-Flow Control Members (AREA)

Abstract

The invention relates to a torsional spring elastic type automatic flow regulating valve which comprises a shell and a valve plate, wherein the shell is formed by connecting three flat plates, an adjustable ventilation window and a fixed ventilation window are arranged in the shell, an arc-shaped ventilation plate with a curve-shaped ventilation hole is arranged at the position of the adjustable ventilation window, the arc-shaped ventilation plate is matched with the valve plate to realize the automatic regulation of the total ventilation area of a valve body along with wind pressure, and the fixed ventilation window regulates the ventilation area by manually setting the position of a wind shield; the bottom edge of the valve plate of the adjustable ventilation window keeps a small distance from the inner side wall of the circular arc ventilation plate but is not contacted with the inner side wall of the circular arc ventilation plate, and the valve plate reciprocates along the circumferential direction of the circular arc ventilation plate under the combined action of airflow and a torsion spring to realize the automatic adjustment of the total ventilation area of the valve body so as to control the airflow passing through the flow valve. The invention has simple structure and small volume, can keep the ventilation quantity of each grid plate of the grid cooler constant under the condition of large resistance change of a material layer, and avoids the bad phenomena of short circuit, local overheating and the like of air flow.

Description

Torsional spring elasticity type automatic flow regulating valve
Technical Field
The invention belongs to the technical field of grate type cooling equipment in the cement industry, and particularly relates to a torsion spring elastic type automatic flow regulating valve.
Background
The grate cooler is one of key devices of a novel dry-method cement production line, bears the tasks of cooling and conveying high-temperature clinker, and needs to recover a large amount of enthalpy carried by the clinker while cooling the high-temperature clinker, and the quality of the operation performance of the grate cooler directly influences the production quality of the cement clinker, the heat consumption of a firing system and the operation rate of the whole production line.
Clinker in the cement rotary kiln is discharged onto a grate bed of the grate cooler, the particle size distribution range of the clinker is large, the shape is complex, and under the influence of the segregation effect of particles with different particle sizes, the thickness and the particle size distribution of the clinker on the grate bed are seriously uneven. The wide range of fluctuations in clinker thickness and porosity can lead to large differences in clinker layer resistance. On the other hand, the existing grate cooler usually adopts a mode of supplying air by a few fans and a large air chamber, if the air supply of each grate plate is not adjusted, the ventilation quantity of part of the grate plates is larger, and the ventilation quantity of other grate plates is smaller, so that the cooling effect and the heat recovery rate of clinker are influenced, and the phenomenon of 'red river' on a material layer is possibly formed. Therefore, the ventilation quantity of each grid plate needs to be self-regulated, and the resistance balance is carried out by adopting the regulating valve, so that the flow of the cooling air is ensured to be balanced and stable and does not change along with the change of the resistance of the material bed.
The existing grate cooler flow valve has the gravity type, the elastic type and other types, has the advantages of less maintenance, small influence of dust, low possibility of mechanical deformation and the like, but is usually large in size, narrow in adjusting range, large in weight of a balancing weight and difficult to install. Compared with a gravity type flow valve, the elastic flow valve has the advantages of small volume, large adjustment range, convenience in installation and the like, but has the problem of fatigue loss of a spring, and can gradually lose efficacy after long-term use.
Disclosure of Invention
The invention provides a torsion spring elastic type automatic flow regulating valve for solving the problems in the prior art, which utilizes the combination of a torsion spring rotating shaft and a valve plate with circular motion and utilizes the rotation of the valve plate to control the area of a ventilation window so as to realize the flow control of gas passing through a valve body.
The invention is realized in such a way that the torsion spring elastic type automatic flow regulating valve comprises a shell and a valve plate, wherein the shell is formed by connecting three flat plates, the top end of the shell is connected with a connecting flange and is fixed below a grate bed, an adjustable ventilation window and a fixed ventilation window are arranged in the shell, an arc-shaped ventilation plate with a curve-shaped ventilation hole is arranged at the position of the adjustable ventilation window, the total ventilation area of the valve body is automatically regulated along with the wind pressure by matching the arc-shaped ventilation plate and the valve plate, and the fixed ventilation window regulates the ventilation area by manually setting the position of a wind shield.
Preferably, adjustable ventilation window includes convex ventilating board, valve plate axle, torsional spring and valve plate, the both ends and the casing of convex ventilating board are connected, the centre of a circle of convex ventilating board and the axle center coincidence of valve plate axle, the both ends of valve plate axle are fixed on the casing, the torsional spring cover is established at the valve plate epaxially, the valve plate contacts with the torsional spring coaxial arrangement and with the torsional spring, and the valve plate rotates and drives the torsional spring rotation simultaneously, and valve plate bottom edge keeps small distance nevertheless contactless with the inside wall of convex ventilating board, thereby the valve plate receives air current and torsional spring combined action to realize the total draft area automatically regulated control of valve body through the gas flow of flow valve along convex ventilating board circumferencial direction reciprocating motion.
Preferably, fixed ventilation window is located one side of convex ventilation board, fixed ventilation window includes deep bead, deep bead pivot, a plurality of deep bead fixed orifices, the top of deep bead is passed through the deep bead pivot and is rotated the connection on the casing, the deep bead can rotate different angles around the deep bead pivot to fix the deep bead in different positions through the fastener that passes the deep bead fixed orifices, with the regulation through the area of ventilation of fixed ventilation window, thereby adjust total draught area.
Preferably, the circular arc-shaped ventilation plate and the two side surfaces of the shell positioned at the position of the adjustable ventilation window are respectively provided with a ventilation hole I and a ventilation hole II which are in a certain curve shape and obtained according to the force balance calculation of the valve plate, so that the valve plate moves to different positions to obtain different ventilation areas.
Further preferably, the calculation method of the curves of the first vent hole and the second vent hole is as follows:
moment T caused by gas pressure on valve plate1The formula is as follows:
T1＝P×A×L/2
wherein, P is static pressure difference of airflow at two sides of the valve plate, and can also be understood as pressure difference between the upper part and the lower part of the valve body; a is the valve plate area and L is the valve plate height.
Torsion moment T brought by torsional spring on valve plate2The formula is as follows:
Figure BDA0002747350280000021
wherein, E is the elastic modulus of torsional spring material, D is the diameter of torsional spring line, and alpha is the angle that the torsional spring rotated, and n is the number of turns of torsional spring winding, and D is the median diameter that forms the cylinder after the torsional spring winding. This equation can be simplified to T2 ═ N × α.
When the two moments are equal, when the valve plate is fixed at a certain position, the static pressure difference P of the airflow at two sides of the valve plate is related to the airflow speed formed by the ventilation air volume, and the following formula can be obtained:
Figure BDA0002747350280000022
xi is a resistance coefficient when air passes through and is determined according to an experimental test result; rho is the air density and V is the airflow speed.
Simultaneously V is Q/Ar, and airflow speed V is confirmed by the gas flow who passes through and draught area, and for guaranteeing that gas flow Q is the same, draught area Ar can be set as the dependent variable parameter that obtains according to the torsional spring turned angle:
Figure BDA0002747350280000031
the ventilation area is derived from the rotation angle of the torsion spring to obtain:
Figure BDA0002747350280000032
the curve of the first vent hole and the curve of the second vent hole are obtained through calculation, the second vent hole is arranged to be expanded under the condition that the first vent hole does not exceed the length of the valve plate, and the working range of the flow valve can be expanded.
Preferably, the edge of the lower end of the circular arc ventilation plate is provided with a limiting baffle plate for limiting the movement range of the valve plate, and the upper part of the shell is provided with a stop block for fixing the torsion spring to limit the movement of the valve plate within a certain range.
Preferably, the valve plate is connected with a torsion spring shaft sleeve sleeved with a torsion spring through a set screw.
At the position of the adjustable ventilation window, the valve plate reciprocates in the shell along the circumferential direction to realize automatic adjustment of the total ventilation area of the valve body so as to control the gas flow passing through the flow valve; through setting up fixed ventilation window, under the condition that adjustable ventilation window is closed completely, still can guarantee that certain gas can pass through, can carry out manual regulation according to the initial amount of wind that passes through of on-the-spot actual need to the flow valve simultaneously.
When the flow of the gas passing through the valve body is small, the valve plate is located at the initial position of the lowest end in the circular arc ventilation plate, the passing area of the gas flow is largest at the moment, and the resistance of the valve body is small; when the gas flow is increased, the valve plate is stressed to move along the circumferential direction, the actual ventilation area on the circular arc ventilation plate begins to be reduced, the resistance of the valve body is gradually increased, the wind speed of the passing gas is increased, and the ventilation area is reduced, so that the flow of the passing gas is constant; when the gas flow is overlarge, the valve plate reaches the uppermost position, only the fixed ventilation window on the side surface is passed by the gas flow, and the resistance of the valve body reaches the maximum value at the moment.
The invention has the advantages and positive effects that:
1. the adjustable ventilation window of the invention ensures that the valve plate is fixed at the position with balanced stress by simultaneously acting the airflow pressure and the torsion force of the torsion spring, and when the valve plate rotates, the ventilation area changes along with the valve plate, thereby controlling the airflow passing through the flow valve.
2. The invention is provided with the fixed ventilation window, can still ensure that certain gas can pass through under the condition that the adjustable ventilation window is completely closed, and can be used for manually adjusting the initial flow of the flow valve.
3. The flow valve body of the invention has simple structure, few moving parts, small volume, full-automatic operation and simple and convenient installation and maintenance; the ventilation quantity of each grid plate of the grate cooler can be kept constant under the condition that the resistance of the material layer is greatly changed, and the adverse phenomena of short circuit, local overheating and the like of airflow are avoided.
4. Through the action of the flow valve, the gas flow passing through each grate plate can be ensured to be equal, and the phenomenon of air volume matching unbalance caused by different material layer resistances is avoided.
Drawings
Fig. 1 is a first perspective view of a torsion spring elastic type automatic flow control valve according to an embodiment of the present invention;
fig. 2 is a second perspective view of the torsion spring elastic type automatic flow regulating valve according to the embodiment of the present invention;
FIG. 3 is a front view of a torsion spring type automatic flow control valve according to an embodiment of the present invention;
FIG. 4 is a left side view of FIG. 3;
FIG. 5 is a sectional view A-A of FIG. 4;
FIG. 6 is a top view of FIG. 3;
FIG. 7 is a force diagram of a valve plate provided by an embodiment of the present invention.
In the figure: 1. a housing; 1-1 and a second vent hole; 2. a connecting flange; 3. an adjustable ventilation window; 4. a circular arc-shaped ventilation board; 4-1, a first vent hole; 5. a valve plate shaft; 6. a torsion spring; 7. a torsion spring shaft sleeve; 8. a valve plate; 9. tightening the screw; 10. a stopper; 11. fixing a ventilation window; 12. a wind deflector; 13. a wind shield rotating shaft; 14. a wind shield fixing hole; 15. a thumb screw; 16. and a limiting baffle.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
referring to fig. 1 to 6, an embodiment of the invention provides a torsion spring elastic type automatic flow regulating valve, which includes a housing 1
And a valve plate 8, the shell 1 is formed by connecting three flat plates, the top end of the shell 1 is connected with the connecting flange 2 and fixed below the grate bed, and the flow regulating valve is fixed below the grate bed through the connecting flange 2, so that the gas passing through the valve body finally enters the grate box. The adjustable ventilation window 3 and the fixed ventilation window 11 are arranged in the shell 1, the arc ventilation plate 4 with curve-shaped ventilation holes is arranged at the position of the adjustable ventilation window 3, the total ventilation area of the valve body is automatically adjusted along with wind pressure by matching the arc ventilation plate 4 with the valve plate 8, and the ventilation area of the fixed ventilation window 11 is adjusted by artificially setting the position of the wind shield 12.
The adjustable ventilation window 3 comprises an arc-shaped ventilation plate 4, a valve plate shaft 5, a torsion spring 6 and a valve plate 8, wherein two ends of the arc-shaped ventilation plate 4 are fixedly connected with the shell 1, the circle center of the arc-shaped ventilation plate 4 is superposed with the axis of the valve plate shaft 5, two ends of the valve plate shaft 5 are fixed on the shell 1, the torsion spring 6 is sleeved on the valve plate shaft 5, one end of the torsion spring 6 is abutted against a stop block 10 at the top of the shell 1, the other end of the torsion spring is sleeved on a torsion spring shaft sleeve 7 and abutted against the valve plate 8, the valve plate 8 is coaxially connected with the torsion spring shaft sleeve 7 sleeved with the torsion spring 6 through a set screw 9, and the valve plate rotates and; the bottom edge of the valve plate 8 keeps a small distance with the inner side wall of the circular arc ventilation plate 4 but is not contacted, and the valve plate 8 reciprocates along the circumferential direction of the circular arc ventilation plate 4 under the combined action of airflow and the torsion spring 6 to realize the automatic adjustment of the total ventilation area of the valve body so as to control the airflow passing through the flow valve.
Fixed ventilation window 11 is located one side of convex ventilation board 4, fixed ventilation window 11 includes deep bead 12, deep bead pivot 13, a plurality of deep bead fixed orifices 14, the top of deep bead 12 is passed through deep bead pivot 13 and is rotated and connect on casing 1, deep bead 12 can rotate different angles around deep bead pivot 13 to fix deep bead 12 in different positions through the fastener that passes deep bead fixed orifices 14, with the draught area through fixed ventilation window 11 of regulation, thereby adjust total draught area.
A ventilation hole I4-1 and a ventilation hole II 1-1 which are in a certain curve shape and obtained according to the stress balance calculation of the valve plate 8 are respectively arranged on the circular arc ventilation plate 4 and two side surfaces of the shell 1 positioned at the adjustable ventilation window 3, so that the valve plate 8 moves to different positions to obtain different ventilation areas.
The curve calculation method for vent one 4-1 and vent two 1-1 is as follows:
moment T caused by gas pressure on valve plate1The formula is as follows:
T1＝P×A×L/2
wherein, P is static pressure difference of airflow at two sides of the valve plate, and can also be understood as pressure difference between the upper part and the lower part of the valve body; a is the valve plate area and L is the valve plate height.
Torsion moment T brought by torsional spring on valve plate2The formula is as follows:
Figure BDA0002747350280000051
wherein, E is the elastic modulus of torsional spring material, D is the diameter of torsional spring line, and alpha is the angle that the torsional spring rotated, and n is the number of turns of torsional spring winding, and D is the median diameter that forms the cylinder after the torsional spring winding. This equation can be simplified to T2 ═ N × α.
When the two moments are equal, when the valve plate is fixed at a certain position, the static pressure difference P of the airflow at two sides of the valve plate is related to the airflow speed formed by the ventilation air volume, and the following formula can be obtained:
Figure BDA0002747350280000052
xi is a resistance coefficient when air passes through and is determined according to an experimental test result; rho is the air density and V is the airflow speed.
Simultaneously V is Q/Ar, and airflow speed V is confirmed by the gas flow who passes through and draught area, and for guaranteeing that gas flow Q is the same, draught area Ar can be set as the dependent variable parameter that obtains according to the torsional spring turned angle:
Figure BDA0002747350280000061
the ventilation area is derived from the rotation angle of the torsion spring to obtain:
Figure BDA0002747350280000062
the curve of the first vent hole and the curve of the second vent hole are obtained through calculation, the second vent hole is arranged to be expanded under the condition that the first vent hole does not exceed the length of the valve plate, and the working range of the flow valve can be expanded.
The circular arc-shaped ventilation plate 4 and the variable ventilation area curve of the side surface of the shell 1 are obtained by correspondingly calculating the total ventilation area and the air speed of the passing air flow when the valve plate 8 is stressed and balanced at different positions, so that the air speed and the ventilation area are in an inverse proportional relation under the condition of any opening degree. The height of the valve plate 8 ensures a constant value of the gas flow through the valve body, whatever the position, as shown in fig. 7.
The lower end edge of the circular arc ventilating plate 4 is provided with a limiting baffle 16 used for limiting the movement range of the valve plate 8, the upper part of the shell 1 is provided with a stop block 10 used for fixing the torsion spring 6, and the valve plate 8 is limited to move within a certain range.
The fastener in this embodiment is preferably a thumb screw 15 to facilitate fastening.
The action principle of the invention is as follows: based on the fluid mechanics principle, the valve is equivalent to a local resistance source, and the throttling element can automatically change the airflow resistance through the resistance balance principle. When the air current passes through the circular arc ventilating plate 4 on the valve body, pressure difference is formed between the upper surface and the lower surface of the valve plate 8, so that a moment acting on the valve plate shaft 5 is formed, and on the other hand, the torsion spring 6 connected with the valve plate 8 can also form a downward moment on the valve plate 8 after rotating for a certain angle, and acts simultaneously with the moment of the pressure difference, so that the valve plate 8 is stabilized at a certain height position under the action of stress balance. At this time, even if the flow rate of the gas passing through the circular arc-shaped vent hole increases, the corresponding vent area decreases, and it is ensured that the total gas flow rate through the valve body is kept constant. In the initial stage, when the air flow passing through the valve body is small, the up-down pressure difference of the valve plate 8 is small, and the valve plate 8 is positioned at the bottommost end; when the airflow gradually increases, the valve plate 8 starts to move upwards, the airflow passing area of the valve body is reduced, and the airflow flow rate is unchanged even if the airflow speed is increased; when the valve plate 8 moves to the top of the limit position, the resistance of the valve body reaches the maximum, and if the pressure difference between the upper part and the lower part of the valve plate 8 is continuously increased, the flow rate of the air flow is continuously increased because the air flow exceeds the adjusting range of the valve body.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.

Claims (7)

1. The utility model provides a torsional spring elasticity formula automatic flow control valve, includes casing and valve plate, the casing is formed by trilateral dull and stereotyped connection, the casing top is connected with flange and is fixed in the grate bed below, a serial communication port, be equipped with adjustable ventilation window and fixed ventilation window in the casing, adjustable ventilation window department is equipped with the convex ventilating board that has curve shape ventilation hole, the total draught area along with the wind pressure automatically regulated of valve body is realized with the valve plate cooperation to convex ventilating board, fixed ventilation window is through the position control draught area of artificial settlement deep bead.
2. The torsion spring elastic type automatic flow regulating valve according to claim 1, wherein the adjustable ventilation window comprises an arc-shaped ventilation plate, a valve plate shaft, a torsion spring and a valve plate, two ends of the arc-shaped ventilation plate are connected with the housing, the center of the arc-shaped ventilation plate coincides with the axis of the valve plate shaft, two ends of the valve plate shaft are fixed on the housing, the torsion spring is sleeved on the valve plate shaft, the valve plate is coaxially arranged with the torsion spring and is in contact with the torsion spring, and the valve plate rotates and drives the torsion spring to rotate; the bottom edge of the valve plate keeps a small distance with the inner side wall of the circular arc ventilation plate but is not contacted with the inner side wall of the circular arc ventilation plate, and the valve plate reciprocates along the circumferential direction of the circular arc ventilation plate under the combined action of air flow and a torsion spring to realize the automatic adjustment of the total ventilation area of the valve body so as to control the air flow passing through the flow valve.
3. The torsion spring elastic automatic flow regulating valve according to claim 1, wherein the fixed ventilation window is located on one side of the circular arc ventilation plate, the fixed ventilation window comprises a wind shield, a wind shield rotating shaft and a plurality of wind shield fixing holes, the top end of the wind shield is rotatably connected to the housing through the wind shield rotating shaft, the wind shield can rotate at different angles around the wind shield rotating shaft, and the wind shield is fixed at different positions through fasteners passing through the wind shield fixing holes so as to adjust the ventilation area passing through the fixed ventilation window, thereby adjusting the total ventilation area.
4. The torsion spring elastic type automatic flow regulating valve according to claim 1, wherein a first ventilation hole and a second ventilation hole with a certain curve shape obtained by calculation according to the force balance of the valve plate are respectively arranged on the circular arc ventilation plate and two side surfaces of the housing at the position of the adjustable ventilation window, so that the valve plate moves to different positions to obtain different ventilation areas.
5. The torsion spring elastic type automatic flow regulating valve according to claim 4, wherein the curve calculation method of the first vent hole and the second vent hole is as follows:
moment T caused by gas pressure on valve plate1The formula is as follows:
T1＝P×A×L/2
wherein P is the static pressure difference of airflow at two sides of the valve plate, A is the area of the valve plate, and L is the height of the valve plate;
torsion moment T brought by torsional spring on valve plate2The formula is as follows:
Figure FDA0002747350270000011
wherein E is the elastic modulus of the torsion spring material, D is the diameter of the torsion spring wire, alpha is the rotating angle of the torsion spring, n is the number of turns of the torsion spring, and D is the median diameter of the cylinder formed after the torsion spring is wound; the formula is simplified to T2＝N×α；
When the two moments are equal, the valve plate is fixed at a certain position, and at the moment, the static pressure difference P of the airflow at two sides of the valve plate is related to the airflow speed formed by the ventilation air volume, and the formula is as follows:
Figure FDA0002747350270000021
xi is a resistance coefficient when air passes through and is determined according to an experimental test result; rho is air density, and V is airflow speed;
and simultaneously, the air flow speed V is determined by the passing air flow Q and the ventilation area Ar, and in order to ensure that the air flow Q is the same, the ventilation area Ar is set as a dependent variable parameter obtained according to the rotation angle of the torsion spring:
Figure FDA0002747350270000022
the ventilation area is derived from the rotation angle of the torsion spring to obtain:
Figure FDA0002747350270000023
and obtaining the curves of the first vent hole and the second vent hole.
6. The torsion spring elastic type automatic flow regulating valve according to claim 1, wherein a limit baffle for limiting the movement range of the valve plate is provided at the lower end edge of the circular arc-shaped ventilation plate, and a stopper for fixing the torsion spring is provided at the upper portion of the housing to limit the movement of the valve plate within a certain range.
7. The torsion spring elastic type automatic flow regulating valve according to claim 1, wherein the valve plate is connected with a torsion spring bushing sleeved with the torsion spring through a set screw.
CN202011171121.4A 2020-10-28 2020-10-28 Torsional spring elasticity type automatic flow regulating valve Active CN112283422B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
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CN113803411A (en) * 2021-09-09 2021-12-17 昆明物理研究所 Double-piece thin gear staggered tooth gap eliminating mechanism of cam type zoom focusing system of thermal infrared imager
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