CN202691195U - Constant air volume valve - Google Patents
Constant air volume valve Download PDFInfo
- Publication number
- CN202691195U CN202691195U CN 201220306862 CN201220306862U CN202691195U CN 202691195 U CN202691195 U CN 202691195U CN 201220306862 CN201220306862 CN 201220306862 CN 201220306862 U CN201220306862 U CN 201220306862U CN 202691195 U CN202691195 U CN 202691195U
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- valve
- valve plate
- valve body
- air quantity
- transverse axis
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Abstract
The utility model provides a constant air volume valve which comprises a through valve body for guiding air and is characterized in that a rotatable cross shaft penetrates through the valve body, at least one end of the cross shaft is exposed outside the valve body, and a valve plate for adjusting ventilation quantity is arranged on the cross shaft. Flow area between a lower half portion of the valve plate below the cross shaft and the valve body is larger than that between an upper half portion of the valve plate above the cross shaft and the valve body. An end of the cross shaft exposed out of the valve body is connected with a moment feedback mechanism for generating a feedback effect by comparing rotating moment on the valve plate to avoid excessive closing. The constant air volume valve can adjust ventilation cross area according to change of air static pressure in front of the valve plate and behind the valve plate, the inside of the valve can generate feedback acting force, the ventilation quality is remained in a constant range, and a manual or mechanical external force effect is not required. Installing is convenient, manufacture is easy, maintenance is not required after setting, service life is long, and a problem of precision falling caused by aging of internal feedback components of the air valve can be solved.
Description
Technical field
The utility model relates to a kind of volume adjusting apparatus, can be widely used in the ventilation system.
Background technique
Can in the HVAC industry, the allocation of the amount of air of ventilation duct be related to the state of air-supply, and reach indoor temperature and humidity requirement.In order to reach the air quantity requirement, the most applications choice for use is decided air quantity valve and is guaranteed that the pipeline air quantity satisfies Air Quantity Required as far as possible.The air quantity valve of deciding commonly used has two classes at present, and a class is by the air-flow of the silica gel air bag induced flow in the balace weight through airduct, realizes that according to the automatic pucker ﹠ bloat of different static pressure air quantity is constant.When inlet/outlet place static air pressure hour, air bag is contraction state.When increasing into and out of place, air port static pressure, air bag just begins to expand, thereby reduces the space around the air bag, makes flow keep constant in certain blast scope.Another kind of be a kind of mechanical type from power apparatus, air quantity control does not need additionaling power, relies on that stream pressure comes the position of positioning control valve in the airduct, thereby in the poor scope of certain pressure air-flow is remained on the predefined flow.Also can add in addition electronic final controlling element and change valve opening by remote signal.
For the Equations of The Second Kind air-valve, often adopt now the devices such as spring or reed to produce internally reaction force, feed back for the variation of static pressure, thereby guarantee that the air quantity that passes through is constant.Change the Zhang Jindu of spring or reed toward the contact meeting in conjunction with screw rod or cam, realize the control of different air quantity.Therefore there is baroque problem.Simultaneously, spring and reed also may produce metal fatigue in use for some time, cause elasticity to weaken.Therefore, the spring tightness of setting and the corresponding relation between the air quantity will change, thereby cause that air quantity changes.
Summary of the invention
The purpose of this utility model provide a kind of can be in the situation that long-term prosthetic be adjusted the air quantity of deciding of accurately operation.
In order to achieve the above object, the technical solution of the utility model has provided a kind of air quantity valve of deciding, comprise the valve body for the perforation of wind-guiding, it is characterized in that: in valve body, be equipped with rotating transverse axis, at least one end of transverse axis is exposed to outside the valve body, be provided with to regulate the valve plate of ventilation at transverse axis, valve plate is larger in the upper half part above the transverse axis and the circulation area between the valve body than valve plate in the lower half portion below the transverse axis and the circulation area between the valve body, and transverse axis is exposed to the outer end of valve body and produces feedback effect to avoid its excessively closed torque-feedback mechanism to link to each other with the suffered running torque of contrast valve plate.
Preferably, described torque-feedback mechanism comprises connecting rod, and an end of connecting rod is exposed to the outer end of valve body with described transverse axis and links to each other, and push rod passes through the two-pack member and links to each other with connecting rod, push rod links to each other with piston, by piston the gas storage air bag of being located in the cylinder block is compressed.
Preferably, described two-pack member comprises the first cuboid member with holes and rotatable and the second cuboid member, link to each other by cylinder between the first cuboid member and the second cuboid member, the first cuboid member is set in outside the described connecting rod movably, and the second cuboid member is fixed on the described push rod.
Preferably, the area of lower half portion of described valve plate is less than the area of upper half part of described valve plate, vertical turning up forms first and turns up part and second and turn up part respectively in the edge section of the right and left of the Lower Half of described valve plate, first turns up part and second turns up part perpendicular to the plane of described valve plate, and with described valve body parallel to an axis.
Preferably, be provided with at least 3 apertures in the middle lower end of described valve plate, the diameter of each aperture is 10～200mm.
Preferably, the part with described connecting rod homonymy outside described valve body is provided with cross bracket, and described cylinder block is fixed on the cross bracket.
Preferably, the internal face on described valve body top is provided be used to the projection that stops that described valve plate is fully closed, outside described valve body, be positioned at described connecting rod with side lower part locate be provided with one and be used for limiting described valve plate and can open to greatest extent cylindrical body.
Preferably, described cylindrical length is greater than the distance between described connecting rod and the described valve outer wall.
Preferably, be respectively equipped with roll left pearl bearing and right ball bearing at the two ends of described transverse axis, roll left pearl bearing and right ball bearing are located on the described valve body.
The beneficial effects of the utility model are: can adjust ventilation-sectional area according to the variation of static air pressure before and after the valve plate, inside can oneself produce feedback effect power, keeps ventilation in a constant scope, need not add artificial or mechanical External Force Acting.And install very conveniently, and easily make, set rear Maintenance free, long service life, the precise decreasing problem that can avoid air-valve to cause because of the internal feedback component ageing.
Description of drawings
Fig. 1 is working principle schematic diagram of the present utility model;
Fig. 2 is overall structure schematic diagram of the present utility model (plan view);
Fig. 3 is side structure schematic diagram of the present utility model (left view);
Fig. 4 is the front schematic view of valve board structure in the utility model;
Fig. 5 A is the structural representation (side view) of two-pack member in the utility model;
Fig. 5 B is the structural representation (plan view) of two-pack member in the utility model.
Embodiment
For the utility model is become apparent, hereby with preferred embodiment, and cooperate accompanying drawing to be described in detail below.
As shown in Figure 1 to Figure 3, the utility model provides a kind of novel decides air quantity valve, comprises valve body 1, and transverse axis 3 is installed at the place, neutral position in valve body 1, and the two ends of transverse axis 3 all pass valve body 1.To roll left pearl bearing 4 and right ball bearing 5 is installed in respectively on the transverse axis 3, and roll left pearl bearing 4 and right ball bearing 5 are fixed on the valve body 1, thereby so that transverse axis 3 can rotate, and, adopt ball bearing can produce less frictional force.At the fixing valve plate 2 of transverse axis 3, valve plate 2 can be with transverse axis 3 rotations.Utilize air-flow poor at the different pressures that valve plate 2 front and back of flowing through produce, control the aperture of valve plate 2, guarantee certain airflow sectional area, so that the volume that air-flow flows through fluctuates within the specific limits in the unit time.
In conjunction with Fig. 4, valve plate 2 is little at upper half part area of transverse axis more than 3 at the Area Ratio of transverse axis lower half portion below 3, and in the edge section of the right and left of lower half portion respectively vertical turning up form first and turn up part 16 and second and turn up part 17, first turns up part 16 and second turns up part 17 perpendicular to valve plate 2 planes, with valve body 1 parallel to an axis.Be provided with 3 apertures in the middle lower end of valve plate 2, be respectively hole 18, hole 19 and hole 20, the diameter of each aperture requires to change in 10～200mm according to different air quantity.
An end outside transverse axis 3 exposes valve body 1 is fixedly connected with connecting rod 6, and connecting rod 6 can rotate with transverse axis 3.Connecting rod 6 bottoms are connected with push rod 7 by a two-pack member 8.
In conjunction with Fig. 5 A and Fig. 5 B, this two-pack member 8 comprises two the first cuboid members with holes and the second cuboid member, be connected a cylinder between the first cuboid member and the second cuboid member, the first cuboid member and the second cuboid member can rotate around connecting cylinder.The first cuboid member is enclosed within on the connecting rod 6, and can slidably reciprocate at connecting rod 6.The second cuboid member is fixed on by retaining screw 9 on certain position of push rod 7, and this position can require to adjust according to air quantity.Outside valve body 1, fix a support 12 with the top of connecting rod 6 homonymies, fix a cylinder block 10 at support 12, be placed with a gas storage air bag 13 in the inside of cylinder block 10, drive piston 11 motions by connecting rod 6 by two-pack member 8 and come compressing gasbag 13.
Working procedure of the present utility model is:
As shown in Figure 1, be working principle schematic diagram of the present utility model, showed the stressing conditions of valve plate.As shown in the figure, suppose air-flow with the valve body of flowing through of the direction shown in the arrow in scheming, be not subjected to the impact that pressure changes before and after the valve, pass through valve body with invariable flow velocity.
When the valve plate 2 in the airflow passes valve body 1, because the area of Area Ratio upper half part of lower half portion of valve plate 2 is little, and have first to turn up part 16 and second and turn up part 17 in lower half portion, therefore the circulation area between valve plate 2 lower half portions and the valve body 1 is larger than the circulation area between upper half part and the valve body 1.Therefore cause when air-flow through out-of-date, the flow velocity V3 of the top edge of valve plate 2 windward sides will be greater than the flow velocity V4 of the lower limb of windward side; The flow velocity V1 of the lower limb of valve plate 2 lee faces will be greater than the flow velocity V2 of lee face top edge simultaneously.Because speed is large, so corresponding dynamic pressure is also large, can know static pressure by inference less.Utilize known relation to obtain: the corresponding static pressure P3 of flow velocity V3 is less than the corresponding static pressure P4 of flow velocity V4, and the corresponding static pressure P1 of flow velocity V1 is less than the corresponding static pressure P2 of flow velocity V2.So when airflow passes valve plate 2, the effect of valve plate differential static pressure about in the of 2 can make valve plate 2 be subject to the effect of running torque M1, causes valve plate 2 to produce the in the counterclockwise direction trend of rotation, namely presents closed trend.
In conjunction with Fig. 2, when valve plate 2 front portions have excess draught to want by valve plate, anterior gas pressure can rise, the air-flow velocity in valve plate gap about in the of 2 increases so that flow through, cause simultaneously above-mentioned differential static pressure to become large, thereby cause that running torque M1 becomes large, when running torque M1 increases to a certain degree, valve plate 2 is swung along the direction of closure.So just so that the airflow sectional area reduces, guarantee air quantity fluctuation within the specific limits.But along with the closure of valve plate 2, the difference of speed can increase gradually, also can increase gradually thereby static pressure is poor on the valve plate 2, may cause valve plate 2 to continue closed.In order to keep the constant of air quantity, must guarantee certain airflow sectional area, namely to there be device that running torque M1 is produced feedback effect, avoid the excessive closure of valve plate 2.For this reason, be fixedly connected with connecting rod 6 at transverse axis one end, and by air bag 13 effects with cylinder body 10 inside of two-pack member 8, push rod 7 and piston 11.Can rotate to valve plate 2 closing directions by drivening rod 6 when as shown in phantom in Figure 1, valve plate 2 is closed.Thereby two-pack member 8 can move upward with connecting rod 6, and slides to connecting rod 6 bottoms simultaneously.Because two-pack member 8 the other ends are fixedly connected with by retaining screw 9 with push rod 7, this is just so that push rod 7 moves pushing piston 11 compressing gasbags 13 straight up.Air bag 13 internal gas are compressed, and volume reduces, and can produce reaction forces to piston 11, thereby hinder the rotation of connecting rod 6, the closure of valve plate 2 are played inhibition, to keep certain circulation area.Valve plate 2 closed degree are larger, namely rotate counterclockwise amplitude larger, and are also larger to the pressure of air bag 13.Air bag 13 internal gas are compressed stronger, and the more little more difficult continuation compression of internal gas volume therefore the reaction force that produces is larger, thereby stops push rod 11 to continue to move upward, and the running torque M2 of the instantaneous pin that connecting rod 6 is produced also becomes large.So just can play the feedback equalization effect, offset running torque M1 to the effect of valve plate 2, avoid valve plate 2 to continue excessively closed.
When valve plate 2 anterior gas flows are lower than when deciding air quantity valve institute limited flow rate value, the pressure of anterior gas can descend, and the air-flow velocity of the valve plate 2 of flowing through reduces, and valve plate 2 suffered differential static pressures diminish, closed running torque M1 diminishes, and can't balance each other with the reaction force that air bag 13 produces.At this moment, air bag 13 will promote push rod 7 and move downward, thereby drivening rod 6 and valve plate 2 rotate to the direction of opening, and increase the circulation area in the valve body 1.When running torque M2 and running torque M1 balance, valve plate 2 stops operating.
But there is a problem in the above-mentioned air quantity valve of deciding, and namely when draught damper 2 soon cut out fully, circulation area was very little, the air-flow velocity of flowing through can significantly increase, can cause in last a bit of distance, the active force of differential static pressure increases suddenly, valve plate 2 unexpected quick and complete closing.For fear of closing suddenly of valve plate 2, once someone advised, weakened the swing of valve plate 2 by a spring assembly, and its reaction force is increased gradually along with the increase of moment.Yet a such device is very unsettled.And the spring constant force of this device can change in time, and therefore, the duration of oscillation of valve plate 2 also can be longer or shorter.Probably, after a period of time, spring weakens, and can't resist the moment loading of valve plate 2 closures, and valve plate 2 may be closed suddenly like this, and can send very large sound, produces very large noise in ventilation system, and has disturbed the adjusting to air-flow.Institute's Adopts measure as shown in Figure 1 to Figure 3, has been set square projection 14 at the internal face on valve body 1 top at present, plays barrier effect, avoids valve plate 2 to be subject to the rapid impact of expanding of air-flow fully closed suddenly.In addition, another kind of extreme case---valve plate 2 is in complete horizontal position for fear of occurring, the surface of airflow passes valve plate 2 is difficult to valve plate is produced active force like this, therefore outside valve body 1, with connecting rod 6 same side lower parts, be provided with a small-sized cylindrical body 15, the length of this cylindrical body 15 is slightly larger than the distance between connecting rod 6 and valve body 1 outer wall, limits valve plate 2 and can open to greatest extent.
To sum up, the utility model need not add artificial or mechanical External Force Acting, can adjust ventilation-sectional area according to the variation of static air pressure before and after the valve plate, and the inner feedback effect power that produces keeps ventilation in the constant scope that allows.
Claims (9)
1. decide air quantity valve for one kind, comprise the valve body (1) for the perforation of wind-guiding, it is characterized in that: in valve body (1), be equipped with rotating transverse axis (3), at least one end of transverse axis (3) is exposed to outside the valve body (1), be provided with to regulate the valve plate (2) of ventilation at transverse axis (3), lower half portion and the circulation area between the valve body (1) that valve plate (2) is positioned at transverse axis (3) below are larger than upper half part and the circulation area between the valve body (1) that valve plate (2) is positioned at transverse axis (3) top, and transverse axis (3) is exposed to the outer end of valve body (1) and produces feedback effect to avoid its excessively closed torque-feedback mechanism to link to each other with the contrast suffered running torque of valve plate (2) (M1).
2. a kind of air quantity valve of deciding as claimed in claim 1, it is characterized in that: described torque-feedback mechanism comprises connecting rod (6), one end of connecting rod (6) is exposed to the outer end of valve body (1) with described transverse axis (3) and links to each other, push rod (7) links to each other with connecting rod (6) by two-pack member (8), push rod (7) links to each other with piston (11), by piston (11) the gas storage air bag (13) of being located in the cylinder block (10) is compressed.
3. a kind of air quantity valve of deciding as claimed in claim 2, it is characterized in that: described two-pack member (8) comprises the first cuboid member with holes and rotatable and the second cuboid member, link to each other by cylinder between the first cuboid member and the second cuboid member, the first cuboid member is set in outside the described connecting rod (6) movably, and the second cuboid member is fixed on the described push rod (7).
4. a kind of air quantity valve of deciding as claimed in claim 1, it is characterized in that: the area of lower half portion of described valve plate (2) is less than the area of upper half part of described valve plate (2), vertical turning up forms first and turns up part (16) and second and turn up part (17) respectively in the edge section of the right and left of the Lower Half of described valve plate (2), first turns up part (16) and second turns up part (17) perpendicular to the plane of described valve plate (2), and with described valve body (1) parallel to an axis.
5. a kind of air quantity valve of deciding as claimed in claim 1, it is characterized in that: the middle lower end at described valve plate (2) is provided with at least 3 apertures, and the diameter of each aperture is 10～200mm.
6. a kind of air quantity valve of deciding as claimed in claim 1, it is characterized in that: the part with described connecting rod (6) homonymy outside described valve body (1) is provided with cross bracket (12), and described cylinder block (10) is fixed on the cross bracket (12).
7. a kind of air quantity valve of deciding as claimed in claim 1, it is characterized in that: the internal face on described valve body (1) top is provided be used to the projection (14) that stops that described valve plate (2) is fully closed, described valve body (1) outside, be positioned at described connecting rod (6) with side lower part locate be provided with one and can open to greatest extent cylindrical body (15) for limiting described valve plate (2).
8. a kind of air quantity valve of deciding as claimed in claim 7, it is characterized in that: the length of described cylindrical body (15) is greater than the distance between described connecting rod (6) and described valve body (1) outer wall.
9. a kind of air quantity valve of deciding as claimed in claim 1, it is characterized in that: be respectively equipped with roll left pearl bearing (4) and right ball bearing (5) at the two ends of described transverse axis (3), roll left pearl bearing (4) and right ball bearing (5) are located on the described valve body (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220306862 CN202691195U (en) | 2012-06-27 | 2012-06-27 | Constant air volume valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220306862 CN202691195U (en) | 2012-06-27 | 2012-06-27 | Constant air volume valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202691195U true CN202691195U (en) | 2013-01-23 |
Family
ID=47546819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220306862 Expired - Fee Related CN202691195U (en) | 2012-06-27 | 2012-06-27 | Constant air volume valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202691195U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103148567A (en) * | 2013-03-28 | 2013-06-12 | 上海理工大学 | Feedback adjusting type air valve device |
| CN103161982A (en) * | 2013-03-28 | 2013-06-19 | 上海理工大学 | Air valve device |
-
2012
- 2012-06-27 CN CN 201220306862 patent/CN202691195U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103148567A (en) * | 2013-03-28 | 2013-06-12 | 上海理工大学 | Feedback adjusting type air valve device |
| CN103161982A (en) * | 2013-03-28 | 2013-06-19 | 上海理工大学 | Air valve device |
| CN103161982B (en) * | 2013-03-28 | 2014-09-17 | 上海理工大学 | Air valve device |
| CN103148567B (en) * | 2013-03-28 | 2015-04-01 | 上海理工大学 | Feedback adjusting type air valve device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130123 Termination date: 20150627 |
|
| EXPY | Termination of patent right or utility model |