CN217951254U

CN217951254U - Air supply device, ventilation system and laboratory

Info

Publication number: CN217951254U
Application number: CN202222353489.3U
Authority: CN
Inventors: 卢丙利; 阮红正
Original assignee: E3 Green Technology Co ltd
Current assignee: E3 Green Technology Co ltd
Priority date: 2022-09-05
Filing date: 2022-09-05
Publication date: 2022-12-02
Anticipated expiration: 2032-09-05

Abstract

The utility model provides an air supply arrangement, include: the shell is internally provided with an inner cavity, and the shell is provided with an air inlet and an air outlet; the filter is arranged in the inner cavity of the shell and is positioned between the air inlet and the air outlet; the first orifice plate is arranged between the air inlet and the filter; the second pore plate is arranged at the air outlet; the valve body is connected with the air inlet and comprises a barrel body and a plurality of blades arranged in the barrel body, and each blade can rotate in the barrel body to adjust the opening degree of the valve body. The utility model discloses can effectively reduce the change frequency of filter to reduce artifical intensity of labour, reduce cost. The utility model also provides a ventilation system and laboratory.

Description

Air supply device, ventilation system and laboratory

Technical Field

The utility model relates to a ventilation technology field, in particular to air supply arrangement, ventilation system and laboratory.

Background

The air supply device is a terminal filtering device which is ideal for a thousand-level, ten-thousand-level and hundred-thousand-level purifying air-conditioning system, and can be widely applied to purifying air-conditioning systems in the industries of medicine, health, electronics, chemical engineering and the like. The air supply device is used as a terminal filtering device for reforming and newly building 1000-300000-grade clean rooms at all levels, and is key equipment for meeting the purification requirement. The air supply device comprises a static pressure box, a flow dispersing plate and a filter, wherein the filter is provided with an air inlet and an air outlet, the filter is arranged inside the static pressure box, the flow dispersing plate covers the air outlet of the static pressure box, the air inlet of the static pressure box is connected with an air pipe, and the air pipe can be connected with the static pressure box in a top connection mode or in a side connection mode. In actual operation, the gas enters the static pressure box through the wind pipe, is filtered by the filter and then is discharged from the air holes on the flow dispersion plate. Because the gas can leave impurity on the filter when filtering through the filter, consequently the filter filters behind more impurity, and its filtering quality can show and reduce, needs to change the filter this moment.

The existing air supply device has the defects of short service cycle of the filter and high replacement frequency in the use process, so that the manual labor intensity is high and the cost is high.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve present air supply arrangement and need frequently change the filter in the use, lead to artifical intensity of labour big, with high costs technical problem. The utility model provides an air supply arrangement and ventilation system can effectively reduce the change frequency of filter to reduce artifical intensity of labour, reduce cost.

In order to solve the above technical problem, an embodiment of the present invention provides an air supply device, including:

the shell is internally provided with an inner cavity, and the shell is provided with an air inlet and an air outlet;

the filter is arranged in the inner cavity of the shell and is positioned between the air inlet and the air outlet;

the first orifice plate is arranged between the air inlet and the filter;

the second pore plate is arranged at the air outlet;

the valve body links to each other with the air inlet, and the valve body includes the barrel and locates a plurality of blades in the barrel, and each blade can be at the barrel internal rotation to adjust the aperture of valve body.

Optionally, each blade encircles the circumference of barrel and is arranged, and the blade is the sector, and the valve body still includes:

the rotating shafts are arranged in the cylinder body, the number of the rotating shafts is the same as that of the blades, each blade is connected with one rotating shaft, and the axis of each rotating shaft is perpendicular to that of the cylinder body;

the transmission mechanism is arranged on the cylinder body, and each blade is connected with the transmission mechanism;

the driving mechanism is arranged on the cylinder body and connected with the transmission mechanism, and the driving mechanism is used for driving the transmission mechanism so that the transmission mechanism drives each blade to synchronously rotate around the respective rotating shaft, and the valve body is switched between a closed state and an open state; wherein the content of the first and second substances,

in a closed state, the side ends of the adjacent blades are mutually attached, and the side ends extend along the radial direction of the cylinder;

in the open state, the side ends of adjacent blades are separated.

Alternatively, the transmission mechanism drives each blade to rotate synchronously by the same angle around the respective rotating shaft so as to switch the valve body between the closed state and the open state.

Optionally, actuating mechanism links to each other with at least one pivot, and inside drive mechanism located the barrel, drive mechanism included:

the mounting cylinder is arranged in the cylinder body, the axis of the mounting cylinder is superposed with the axis of the cylinder body, and the mounting cylinder is fixed on the cylinder body through a support frame;

the first bevel gear is arranged at one end of the mounting cylinder and can rotate around the mounting cylinder;

the second bevel gear is arranged at the other end of the mounting cylinder and can rotate around the mounting cylinder, the first bevel gear and the second bevel gear are both provided with teeth distributed along the circumferential direction, the teeth on the first bevel gear and the teeth on the second bevel gear are arranged oppositely, and each blade surrounds the outer sides of the first bevel gear and the second bevel gear;

and the second blade gears are arranged between the teeth of the first bevel gear and the teeth of the second bevel gear, and are meshed with the teeth of the first bevel gear and the teeth of the second bevel gear.

Optionally, drive mechanism locates the barrel outside, and drive mechanism includes:

the first transmission part is annular, is sleeved on the outer surface of the cylinder and is connected with the driving mechanism;

the second transmission parts are in one-to-one correspondence with the blades, and each second transmission part is connected with the rotating shaft of the corresponding blade and is connected with the first transmission part;

the driving mechanism is used for driving the first transmission parts to rotate forwards or reversely along the circumferential direction so as to synchronously drive each second transmission part, so that each second transmission part drives the corresponding blade to rotate forwards or reversely around the corresponding rotating shaft;

in the process that the first transmission part rotates forwards along the circumferential direction, the valve body is switched from a closed state to an open state;

in the process that the first transmission part rotates reversely in the circumferential direction, the valve body is switched from the open state to the closed state.

Optionally, the air supply device further comprises a flow detection device arranged at the upstream of the valve body, and the flow detection device is used for detecting the flow of the air entering the air supply device.

Optionally, the flow sensing device meter comprises:

the venturi tube is arranged in the middle of the venturi tube along the extension direction of the venturi tube, the inner diameter of the middle of the venturi tube is smaller than that of the air inlet end of the venturi tube, the venturi tube is provided with a first vent hole and a second vent hole, the first vent hole is arranged close to the air inlet end of the venturi tube, the second vent hole is arranged on the side wall of the position, with the smallest inner diameter, of the venturi tube, the second vent hole extends along the radial direction of the venturi tube, and the second vent hole is communicated with the inner cavity of the venturi tube;

the detection mechanism is used for detecting a first pressure value of the gas flowing through the first vent hole and a second pressure value of the gas flowing through the second vent hole and outputting a difference value between the first pressure value and the second pressure value.

Optionally, the flow sensing device meter comprises:

the pipe body is provided with an air inlet end and an air outlet end;

the first collecting pipe is arranged in the pipe body and extends along the radial direction of the pipe body, a first vent hole is formed in the pipe wall of the first collecting pipe and faces the air inlet end of the pipe body, and the extending direction of the first vent hole is parallel to the extending direction of the pipe body;

the second collecting pipe is arranged in the pipe body, is positioned between the first collecting pipe and the air outlet end of the pipe body, extends along the radial direction of the pipe body, is provided with a second vent hole on the pipe wall, faces the air outlet end of the pipe body and has an extending direction parallel to the extending direction of the pipe body;

the detection mechanism is used for detecting a first pressure value of the gas flowing through the first collection pipe and a second pressure value of the gas flowing through the second collection pipe and outputting a difference value between the first pressure value and the second pressure value.

Optionally, the flow sensing device meter comprises:

the air inlet pipe comprises a pipe body, a first air inlet pipe and a second air inlet pipe, wherein the pipe body is provided with an air inlet end and an air outlet end;

the pore plate is arranged in the pipe body, the pore plate is perpendicular to the axial direction of the pipe body, the first vent hole is positioned between the pore plate and the air inlet end of the pipe body, the second vent hole is positioned between the pore plate and the air outlet end of the pipe body, the edge of the pore plate is attached to the inner wall of the pipe body, and a through hole is formed in the center of the pore plate;

Optionally, be equipped with a supporting beam in the barrel, a supporting beam is located the upstream direction of blade, and flow detection device includes on locating a supporting beam:

the anemoscope is an impeller anemoscope, and the rotating surface of an impeller of the impeller anemoscope can be perpendicular to the extending direction of the cylinder;

and the detection unit is used for measuring the rotating speed of the impeller type anemometer.

Optionally, the casing is a cuboid, and the air inlet and the air outlet are arranged oppositely, or the air inlet and the air outlet are respectively arranged on two surfaces of the casing, which are perpendicular to each other.

Optionally, a connecting piece is connected to the first orifice plate, the first orifice plate is fixed to the inner wall of the housing through the connecting piece, the first orifice plate is arranged opposite to the air inlet, and a certain distance is arranged between the first orifice plate and the air inlet.

Optionally, a second orifice plate covers the outlet, the second orifice plate being spaced a distance from the bottom of the filter.

Optionally, the aerosol filter further comprises a detection tube, an air inlet end of the detection tube is connected with the aerosol generating device, an air outlet end of the detection tube is arranged in a gap between the first pore plate and the air inlet, and the aerosol generating device can input aerosol to the upstream of the filter through the detection tube.

Optionally, a fixing pressing sheet is further arranged in the inner cavity of the shell, the fixing pressing sheet is detachably connected to the inner wall of the shell, and the upper surface of the fixing pressing sheet is in contact with the bottom surface of the filter to limit the downward movement of the filter.

Optionally, the outside of the air inlet is provided with an outwardly protruding flange for connecting the cylinder.

Optionally, a lifting lug is arranged on the housing, and the lifting lug is used for fixing the housing.

The utility model discloses an embodiment still provides a ventilation system, including aforementioned any kind air supply arrangement.

The utility model discloses an embodiment still provides a laboratory, is equipped with aforementioned any kind of air supply arrangement on the roof or the wall in laboratory.

Compared with the prior art the utility model discloses following beneficial effect has:

this embodiment is through setting up a plurality of blades in the valve body, when the amount of wind is adjusted to needs, a plurality of blades rotate simultaneously, form many airflow channel, thereby can make gaseous even contact with the filter behind many airflow channel, increase the area of contact of filter and air current, it is even to make the filter catch the wind, and then avoid the problem that the filter became invalid easily because of the filter is caught the wind inhomogeneous and leads to, thereby strengthen the life of filter, reduce filter replacement frequency, reduce artifical intensity of labour, reduce cost.

Drawings

Fig. 1 is a schematic view of an air supply device according to an embodiment of the present invention;

fig. 2 is a schematic view of an air supply device according to another embodiment of the present invention;

fig. 3 is a sectional view of a housing according to an embodiment of the present invention;

fig. 4 is a schematic view of a valve body according to an embodiment of the present invention;

fig. 5 is a schematic view of a valve body according to another embodiment of the present invention;

fig. 6 is a schematic view of a transmission mechanism provided by an embodiment of the present invention;

fig. 7 shows a schematic view of a transmission mechanism provided by another embodiment of the present invention;

fig. 8 shows a schematic view of a transmission mechanism provided by another embodiment of the present invention;

fig. 9 shows a schematic view of a transmission mechanism provided by another embodiment of the present invention;

fig. 10 is a schematic view of an air supply device according to another embodiment of the present invention;

fig. 11 is a cross-sectional view of a flow rate detecting device according to an embodiment of the present invention;

fig. 12 shows a partially enlarged view of a portion a in fig. 11;

fig. 13 is a cross-sectional view of a flow sensing device according to another embodiment of the present invention;

fig. 14 shows a partially enlarged view of a portion B in fig. 13;

fig. 15 is a schematic view of a flow rate detection device according to another embodiment of the present invention;

FIG. 16 shows a cross-sectional view of FIG. 15;

fig. 17 is a partially enlarged view of a portion C of fig. 16;

fig. 18 is a schematic view of a flow rate detection device according to another embodiment of the present invention;

FIG. 19 shows a cross-sectional view taken along line D-D of FIG. 18;

fig. 20 shows a partially enlarged view of a portion F in fig. 19;

FIG. 21 shows a cross-sectional view taken along line E-E of FIG. 18;

fig. 22 is a schematic view of a flow rate detection device according to another embodiment of the present invention.

Reference numerals:

1. a housing; 11. an air inlet; 12. an air outlet; 13. a flange; 14. lifting lugs; 2. a filter; 3. a transmission mechanism; 31. a drive ring; 311. a first bump; 312. a second bump; 32. a blade deflector rod; 321. a first through hole; 33. driving a deflector rod; 331. a second through hole; 34. a connecting rod; 35. a rocker; 36. a first blade gear; 37. a drive gear; 38. a gear plate; 41. mounting the cylinder; 42. a support frame; 43. a first bevel gear; 44. a second bevel gear; 45. a second blade gear; 5. a first orifice plate; 51. a connecting member; 6. a second orifice plate; 7. a valve body; 71. a barrel; 72. a blade; 73. a rotating shaft; 74. a drive mechanism; 8. fixing the pressing sheet; 9. a detection tube; 10. a flow detection device; 101. a venturi tube; 1011. a first vent hole; 1012. a second vent hole; 1013. an air inlet end; 103. a pipe body; 1031. a first connection hole; 1032. a second connection hole; 1033. a first separator; 1034. a second separator; 1035. a first cavity; 1036. a second cavity; 201. a pipe body; 2011. an air inlet end; 202. a first collection tube; 2021. a first air vent; 203. a second collection tube; 2031. a second vent hole; 301. a pipe body; 3011. an air inlet end; 3012. a first vent hole; 3013. a second vent hole; 302. an orifice plate; 3021. a through hole; 3022. a tip portion; 401. a support beam; 402. an anemometer; 20. a control cabinet; 30. a first air pipe; 40. a second air pipe; 50. and (7) an air pipe.

Detailed Description

The following description is given for illustrative embodiments of the invention, and other advantages and effects of the invention will be apparent to those skilled in the art from the disclosure of the present invention. While the invention will be described in conjunction with the preferred embodiments, it is not intended to limit the features of the invention to that embodiment. On the contrary, the intention of implementing the novel features described in connection with the embodiments is to cover other alternatives or modifications which may be extended based on the claims of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be practiced without these particulars. Furthermore, some of the specific details are omitted from the description so as not to obscure or obscure the present invention. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

It should be noted that in this specification, like reference numerals and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

The terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the present embodiment, it should be further noted that, unless explicitly stated or limited otherwise, the terms "disposed," "connected," and "connected" are to be interpreted broadly, e.g., as a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present embodiment can be understood in specific cases by those of ordinary skill in the art.

In order to make the technical solutions and advantages of the present invention clearer, the following describes embodiments of the present invention in further detail.

The air supply device is a terminal filtering device which is ideal for thousands, tens of thousands and hundreds of thousands of purified air-conditioning systems, and can be widely applied to the purified air-conditioning systems in the industries of medicine, health, electronics, chemical engineering and the like. The air supply device is used as a terminal filtering device for reforming and newly building 1000-300000-grade clean rooms at all levels, and is key equipment for meeting the purification requirement. The air supply device comprises a static pressure box, a flow dispersing plate and a filter, wherein the static pressure box is provided with an air inlet and an air outlet, the filter is arranged inside the static pressure box, the flow dispersing plate covers the air outlet of the static pressure box, the air inlet of the static pressure box is connected with an air pipe, and the air pipe can be connected to the static pressure box in a top connection mode or in a side connection mode. In actual operation, the gas enters the static pressure box through the wind pipe, is filtered by the filter and then is discharged from the air holes on the flow dispersion plate. Because the gas can leave impurity on the filter when filtering through the filter, consequently the filter filters behind more impurity, and its filtering quality can show and reduce, needs to change the filter this moment. The existing air supply device has the defects of short service cycle of the filter and high replacement frequency in the use process, so that the manual labor intensity is high and the cost is high.

The applicant has found that the main reason for frequent replacement of the filter in the air supply device in the prior art is as follows: in practical application, in order to adjust the air volume of the air supply device, a valve body is generally arranged in the upstream area of the filter, and the sectional area of an air flow channel in the valve body can be adjusted by controlling the rotation angle of blades in the valve body, so that the air exhaust volume of the air supply device is adjusted. However, because the valve body is generally only provided with one blade, the effective cross-sectional area of the airflow channel can be small, the wind speed of the air outlet cross section is not uniformly distributed, only a small area corresponding to the airflow channel on the filter can be contacted with the airflow, the filtering effect is achieved, the rest large-area on the filter does not have gas to pass through, the filtering effect cannot be achieved, the filtered impurities in the gas are concentrated and remained in the small area corresponding to the airflow channel on the filter, the residual impurities in the area easily exceed the standard, the failure of the filter is fast, and the replacement is frequent.

Referring to fig. 1 to 4, an embodiment of the present invention provides an air supply device, including: the filter comprises a shell 1, a filter 2, a first orifice plate 5, a second orifice plate 6 and a valve body 7. Wherein, the inside of the shell 1 is provided with an inner cavity, and the shell 1 is provided with an air inlet 11 and an air outlet 12; the filter 2 is detachably arranged in the inner cavity of the shell 1, and the filter 2 is positioned between the air inlet 11 and the air outlet 12; the first orifice 5 is arranged between the air inlet 11 and the filter 2; the second orifice plate 6 is arranged at the air outlet 12; the valve body 7 is connected to the air inlet 11, the valve body 7 includes a cylinder 71 and a plurality of vanes 72 disposed in the cylinder 71, and each vane 72 can rotate in the cylinder 71 to adjust the opening degree of the valve body 7. When the gas flows into the air supply device, the gas passes through the valve body 7, the air inlet 11, the first orifice plate 5, the filter 2, the air outlet 12 and the second orifice plate 6 in sequence.

This embodiment is through setting up a plurality of blades 72 in valve body 7, when the amount of wind is adjusted to needs, a plurality of blades 72 rotate simultaneously, form many airflow channel, thereby can make gaseous even contact with filter 2 behind many airflow channel, increase the area of contact of filter 2 and air current, it is even to make filter 2 catch the wind, and then avoid the easy problem that became invalid of filter because of filter 2 catches the wind inhomogeneous and leads to, thereby strengthen the life of filter, reduce filter change frequency, reduce artifical intensity of labour, reduce cost.

Alternatively, referring to fig. 4, the vanes 72 are arranged around the circumference of the cylinder 71, the vanes 72 are fan-shaped, and the valve body 7 further includes a plurality of rotating shafts 73, the transmission mechanism 3, and a driving mechanism 74. The rotating shafts 73 are arranged in the cylinder 71, the number of the rotating shafts 73 is the same as that of the blades 72, each blade 72 is connected with one rotating shaft 73, and the axis of each rotating shaft 73 is perpendicular to that of the cylinder 71; the transmission mechanism 3 is arranged on the cylinder 71, and each blade 72 is connected with the transmission mechanism 3; the driving mechanism 74 is disposed on the cylinder 71, the driving mechanism 74 is connected to the transmission mechanism 3, and the driving mechanism 74 is configured to drive the transmission mechanism 3, so that the transmission mechanism 3 directly or indirectly drives each of the vanes 72 to rotate synchronously around the respective rotating shaft 73, so as to switch the valve body 7 between the closed state and the open state. In the closed state, the side ends of the adjacent vanes 72 are attached to each other, and the side ends extend in the radial direction of the cylinder 71; in the open state, the side ends of the adjacent vanes 72 are separated. Preferably, the transmission mechanism 3 drives each vane 72 to rotate synchronously by the same angle about the respective rotation shaft 73 to switch the valve body 7 between the closed state and the open state. By adopting the technical scheme, the blades 72 synchronously rotate by the same angle, and the uniformity and stability of the airflow can be further ensured.

Specifically, the transmission mechanism 3 may be provided inside the cylindrical body 71 or outside the cylindrical body 71, and the following description will be made for each case.

When the transmission mechanism 3 is provided inside the cylinder 71, referring to fig. 5 and 6, the driving mechanism 74 is connected to at least one rotating shaft 73, and the transmission mechanism 3 includes: a mounting cylinder 41, a first bevel gear 43, a second bevel gear 44, and a plurality of second blade gears 45. The mounting cylinder 41 is arranged inside the cylinder 71, the axis of the mounting cylinder 41 is overlapped with the axis of the cylinder 71, and the mounting cylinder 41 is fixed on the cylinder 71 through the support frame 42; a first bevel gear 43 is arranged at one end of the mounting cylinder 41, and the first bevel gear 43 can rotate around the axis of the mounting cylinder 41; the second bevel gear 44 is arranged at the other end of the mounting cylinder 41, the second bevel gear 44 can rotate around the axis of the mounting cylinder 41, the first bevel gear 43 and the second bevel gear 44 are both provided with teeth distributed along the circumferential direction, the teeth on the first bevel gear 43 and the teeth on the second bevel gear 44 are arranged oppositely, and each blade 72 surrounds the outer sides of the first bevel gear 43 and the second bevel gear 44; the plurality of second blade gears 45 correspond to the plurality of rotating shafts 73 one by one, each second blade gear 45 is connected with the corresponding rotating shaft 73, the second blade gears 45 are arranged between the teeth of the first bevel gear 43 and the second bevel gear 44, and each second blade gear 45 is meshed with the teeth of the first bevel gear 43 and the teeth of the second bevel gear 44 respectively.

When the blades 72 need to be driven to rotate, the driving mechanism 74 drives the blades connected with the driving mechanism and the rotating shaft 73 and the second blade gear 45 connected with the blades to rotate, the second blade gear 45 drives the first bevel gear 43 and the second bevel gear 44 to rotate, then the first bevel gear 43 and the second bevel gear 44 drive the other second blade gears 45 to rotate, and further the rotating shaft 73 and the blades 72 connected with the other second blade gears 45 are driven to rotate, so that the synchronous rotation of each blade 72 is realized.

The transmission mechanism 3 is arranged in the cylinder 71, so that holes can be prevented from being formed in the cylinder 71, gas leakage can be prevented, and the structure can be used in occasions where air cannot leak, such as a clean room.

When the transmission mechanism 3 is provided outside the cylinder 71, as shown in fig. 4, the transmission mechanism 3 includes: the first transmission part and the second transmission part. The first transmission part is annular and is sleeved on the outer surface of the cylinder 71, and the first transmission part is connected with the driving mechanism 74; the first transmission unit is rotatable with respect to the cylinder 71 but immovable in the axial direction of the cylinder 71. The second transmission parts correspond to the plurality of blades 72 one by one, and each of the second transmission parts is connected to the rotation shaft 73 of the corresponding blade 72 and to the first transmission part. The driving mechanism 74 is used for driving the first transmission parts to rotate forwards or backwards along the circumferential direction so as to synchronously drive each second transmission part, so that each second transmission part drives the corresponding blade 72 to rotate forwards or backwards around the respective rotating shaft 73; in the process that the first transmission part rotates forwards along the circumferential direction, the valve body 7 is switched from a closed state to an open state; in the process of the reverse rotation of the first transmission portion in the circumferential direction, the valve body 7 is switched from the open state to the closed state. By adopting the technical scheme, the transmission mechanism 3 is arranged outside the cylinder 71, so that the maintenance is convenient, and the closing tightness of the blades 72 can be enhanced.

The present application does not specifically limit the structures of the first transmission portion and the second transmission portion. In some embodiments, as shown in fig. 7, the first transmission portion is a transmission ring 31, the second transmission portion is a blade shift lever 32, one end of the blade shift lever 32 is rotatably connected to the transmission ring 31, the other end of the blade shift lever 32 is fixedly connected to a rotating shaft 73 of the blade 72, and the other end of each blade shift lever 32 can swing around a connecting point of the rotating shaft 73 and the blade shift lever 32. The outer peripheral surface of the driving ring 31 is provided with a plurality of first protrusions 311 corresponding to the plurality of blade shift levers 32 one to one, one end of the blade shift lever 32 is provided with a first through hole 321 extending along the extending direction of the blade shift lever 32, and the first protrusion 311 corresponding to the blade shift lever 32 is clamped in the first through hole 321 and can move along the hole wall of the first through hole 321. When the blade 72 needs to be driven to rotate, the driving mechanism 74 drives the driving ring 31 to rotate, and each first protrusion 311 drives the blade shift lever 32 to swing by taking a connection point of the rotating shaft 73 and the blade shift lever 32 as a pivot through a connection part with the first through hole 321, so as to drive the rotating shaft 73 and the blade 72 to rotate.

In other embodiments, as shown in fig. 8, the first transmission portion is a transmission ring 31, the second transmission portion includes a connecting rod 34 and a rocker 35, one end of the connecting rod 34 is rotatably connected to the transmission ring 31, the other end of the connecting rod is rotatably connected to one end of the rocker 35, and the other end of the rocker 35 is fixedly connected to the rotating shaft 73 of the vane 72. The transmission mechanism 3 further comprises a driving shift lever 33, one end of the driving shift lever 33 is rotatably connected with the transmission ring 31, and the other end of the driving shift lever 33 is fixedly connected with the driving mechanism 74; the driving mechanism 74 is used for driving the driving lever 33 to swing forwards or backwards so as to drive the transmission ring 31 to rotate forwards or backwards along the circumferential direction. The outer circumference of the driving ring 31 is provided with a second protrusion 312 corresponding to the driving lever 33, one end of the driving lever 33 is provided with a second through hole 331 extending along the extending direction of the driving lever 33, and the second protrusion 312 is engaged in the second through hole 331 and can move along the hole wall of the second through hole 331. When the blade 72 needs to be driven to rotate, the driving mechanism 74 drives the driving ring 31 to rotate through the driving lever 33, and the driving ring 31 drives the connecting rods 34 and the rocker 35 to operate, so as to drive the rotating shafts 73 and the blades 72 to rotate.

In other embodiments, as shown in fig. 9, the first transmission part is a gear plate 38, and one end of the gear plate 38 in the first direction is provided with teeth distributed along the circumferential direction; the second transmission part is a first blade gear 36, and the first blade gear 36 is fixedly connected with the rotating shaft 73 of the blade 72 and meshed with the teeth of the gear disc 38. The transmission mechanism 3 further comprises a driving gear 37 fixedly connected with the driving mechanism 74 and meshed with the teeth of the gear disc 38, and the driving mechanism 74 is used for driving the driving gear 37 to rotate forwards or backwards so as to drive the gear disc 38 to rotate forwards or backwards along the circumferential direction. When the blades 72 need to be driven to rotate, the driving mechanism drives the gear disc 38 to rotate through the driving gear 37, and the gear disc 38 drives each first blade gear 36 to rotate, thereby driving each rotating shaft 73 and each blade 72 to rotate.

Alternatively, as shown in fig. 10, the air supply device according to the present embodiment further includes a flow rate detection device 10 disposed upstream of the valve body 7, and the flow rate detection device 10 is configured to detect a flow rate of the gas entering the air supply device. In the prior art, a flow detection device is arranged in an air supply device and is matched with a valve body, but the problem of inaccurate measurement result often occurs in the existing flow detection device. The applicant has found that the main reasons for the inaccuracy of the detection result of the existing flow rate detection device are as follows: because the existing valve body is generally of a single-blade structure, air flow can be deviated to an opening formed after the blades rotate when passing through the valve body, so that the whole air flow path is deviated, if the installation position of the flow detection device is close to the deviated air flow, the detection result is increased, and if the installation position of the flow detection device is far away from the deviated air flow, the detection result is reduced, so that the detection result is inaccurate; in addition, the air flow is not uniformly distributed when passing through the single-blade valve body, and turbulence, reverse flow, and turbulent flow are easily generated, which may also cause inaccurate flow rate detection results. This embodiment is through setting up a plurality of blades 72 in valve body 7, and when the amount of wind was adjusted to needs, a plurality of blades 72 rotated simultaneously, formed many evenly distributed's a gas flow channel to can make gaseous even stable through many gas flow channel, and then avoid the inaccurate problem of testing result because of gas flow direction skew leads to. In addition, the structure of the multiple blades 72 can make the gas uniformly and stably pass through the valve body 7, so that the conditions of turbulent flow, reverse flow and turbulent flow of the gas can be avoided, and the accuracy of the detection result is further enhanced.

In this embodiment, the flow detecting device 10 may be a venturi flow meter, a pitot tube flow meter, an orifice plate flow meter or an impeller flow meter. In order to make the structure and the working principle of each flow meter better understood by those skilled in the art, the venturi flow meter, the pitot tube flow meter, the orifice plate flow meter and the impeller flow meter are further described below by four embodiments.

Example one

In this embodiment, the flow rate detection device 10 is a venturi flow meter. Referring to fig. 11 to 14, the flow rate detecting device 10 includes a venturi tube 101 and a detecting mechanism. Wherein, along the extending direction (X direction shown in fig. 11) of venturi 101, the inner diameter (shown as dimension D in fig. 11) of the middle part of venturi 101 is smaller than the inner diameter (shown as dimension D1 in fig. 11) of the air inlet 1013 of venturi 101, venturi 101 is provided with a first vent 1011 and a second vent 1012, first vent 1011 is arranged near the air inlet 1013 of venturi 101, second vent 1012 is arranged on the side wall of the least inner diameter of venturi 101, second vent 1012 extends along the radial direction of venturi 101, and second vent 1012 is communicated with the inner cavity of venturi 101; the detection mechanism is configured to detect a first pressure value of the gas flowing through the first vent 1011 and a second pressure value of the gas flowing through the second vent 1012, and output a difference between the first pressure value and the second pressure value.

As the gas flows through the venturi 101, since the inner diameter of the middle of the venturi 101 is smaller than the inner diameter of the gas inlet 1013 of the venturi 101, according to the venturi principle, the gas flows through the middle of the venturi 101 to form a local contraction, which results in an increase in the flow rate, such that the gas pressure value (i.e., the second pressure value) at the middle of the venturi 101 is smaller than the gas pressure value (i.e., the first pressure value) at the gas inlet 1013 of the venturi 101. In the present embodiment, the detection mechanism detects the first pressure value and the second pressure value, so as to obtain the pressure difference between the first pressure value and the second pressure value, and thus the gas flow rate value flowing through the venturi 101 can be calculated according to the pressure difference and the bernoulli equation. Since the pressure difference between the first pressure value and the second pressure value varies in real time according to the actual condition of the gas flow in the venturi 101, the present embodiment can effectively improve the detection accuracy of the gas flow value.

When calculating the gas flow value in the venturi 101, the operator may manually calculate the gas flow value, or the difference between the first pressure value and the second pressure value may be transmitted to the control system, and the control system may calculate the gas flow value and output the gas flow value. When the flow rate value of the gas is calculated by the control system, the present embodiment further includes: a control cabinet 20, a first air duct 30 and a second air duct 40; the detection mechanism is arranged in the control cabinet 20, one end of the first air pipe 30 is communicated with the first vent 1011, the other end of the first air pipe 30 is communicated with the detection mechanism, and the first air pipe 30 can guide the air flow passing through the first vent 1011 to the detection mechanism, so that the detection mechanism detects a first pressure value of the air flowing through the first vent 1011; one end of the second air tube 40 is communicated with the second vent 1012, the other end of the second air tube 40 is communicated with the detection mechanism, and the second air tube 40 can guide the air flow passing through the second vent 1012 into the detection mechanism, so that the detection mechanism can detect a second pressure value of the air flowing through the second vent 1012. Specifically, in this embodiment, the detection mechanism is a pressure sensor, the control cabinet 20 is further provided with a controller, the controller is electrically connected to the detection mechanism, and the controller can read a difference between a first pressure value and a second pressure value output by the detection mechanism, and calculate a flow value of the gas in the venturi tube 101 according to the difference and a correlation formula.

Alternatively, the first vent 1011 may be disposed on an inner wall of the inlet end 1013 of the venturi 101, or may be disposed on an end surface of the inlet end 1013 of the venturi 101. In order to make the arrangement position of the first ventilation hole 1 better known to those skilled in the art, the arrangement position of the first ventilation hole 1 will be described in further detail below.

When the first ventilation hole 1011 is provided on the inner wall of the air inlet 1013 of the venturi 101, referring to fig. 11 and 12, the first ventilation hole 1011 extends in the radial direction of the venturi 101, and the first ventilation hole 1011 communicates with the inner cavity of the venturi 101. By providing the first ventilation hole 1011 in the side wall of the venturi 101, dust entrained in the air flow can be prevented from entering the first ventilation hole 1011, and the first ventilation hole 1011 can be prevented from being clogged.

In this embodiment, the first pressure value and the second pressure value are both static pressure values, and the gas flow value in the venturi 101 can be calculated by a first calculation formula, which is derived by the bernoulli equation, where the first calculation formula is:

wherein q is _v Is the flow value of the gas in the venturi 101, in m ³ S; c is the gas outflow coefficient, and epsilon is the gas expansibility coefficient; d is the value of the internal diameter at the minimum section of the venturi 101 (dimension d shown in fig. 11) in m; β is the ratio of the value of the internal diameter at the minimum cross-section of the venturi 101 to the value of the internal diameter of the inlet end 1013 of the venturi 101 (dimension D1 as shown in fig. 11); rho is the density of the gas in kg/m ³ (ii) a Δ p is the difference between the first pressure value and the second pressure value in Pa.

Referring to fig. 13 and 14, when the first ventilation hole 1011 is provided on the end surface of the intake end 1013 of the venturi 101, the extending direction of the first ventilation hole 1011 is parallel to the extending direction of the venturi 101, and when gas is blown toward the intake end 1013 of the venturi 101, the gas can flow into the first ventilation hole 1011. By providing the first ventilation hole 1011 on the end surface of the air inlet 1013 of the venturi 101, it is possible for an operator to easily machine the first ventilation hole 1011, thereby reducing the difficulty of machining.

In this embodiment, the first pressure value is a full pressure value, the second pressure value is a static pressure value, and the gas flow value in the venturi 101 can be calculated by a second calculation formula, where the second calculation formula is:

wherein q is _v Is the flow rate value of the gas in the venturi 101, and is expressed in m ³ S; d is the value of the internal diameter at the minimum section of the venturi 101 (dimension d as shown in fig. 13) in m; ρ is the density of the gas in kg/m ³ (ii) a Δ p is the difference between the first pressure value and the second pressure value in Pa.

The second calculation formula may be derived according to a first derivation formula, a second derivation formula, and a third derivation formula, and the first derivation formula, the second derivation formula, and the third derivation formula are described below:

the first derivation formula is:

p _q -p _j ＝p _d

wherein p is _q Is a first pressure value, p _j Is a second pressure value, p _d The dynamic pressure value is obtained.

In this embodiment, the first pressure value is a full pressure value of the gas, and the second pressure value is a static pressure value of the gas.

The second derivation formula is:

wherein p is _d Dynamic pressure value in Pa; ρ is the density of the gas in kg/m ³ (ii) a v is the flow velocity of the gas in the venturi 101 in m/s.

The third derivation formula is:

wherein q is _v Is the flow value of the gas in the venturi 101, in m ³ S; d is the value of the internal diameter at the minimum section of the venturi 101 (d dimension as shown in fig. 13) in m; v is the flow velocity of the gas in the venturi 101 in m/s.

The above is a more detailed description of the position where the first ventilation hole 1011 is provided, and it cannot be assumed that the specific position where the first ventilation hole 1011 is provided is limited to these descriptions. All equivalent implementations or modifications that do not depart from the scope of the present invention are intended to be included within the scope of the present patent.

Optionally, as shown in fig. 12 and 14, the present embodiment further includes: tube 103, first divider 1033, and second divider 1034. The tube body 103 is sleeved outside the venturi tube 101, the outer wall of the venturi tube 101 and the inner wall of the tube body 103 are arranged at intervals, and the side wall of the tube body 103 is provided with a first connecting hole 1031 and a second connecting hole 1032; the first partition 1033 is arranged between the venturi tube 101 and the tube 103, the first connection hole 1031 and the second connection hole 1032 are respectively arranged at two sides of the first partition 1033, and the first partition 1033, the outer wall of the venturi tube 101 and the inner wall of the tube 103 jointly enclose a first cavity 1035; the second partition 1034 is disposed between the venturi tube 101 and the tube 103, the second connection hole 1032 and the air outlet end of the venturi tube 101 are disposed at two sides of the second partition 1034, and the first partition 1033, the second partition 1034, the outer wall of the venturi tube 101 and the inner wall of the tube 103 together enclose a second cavity 1036.

The first cavity 1035 is respectively communicated with the first vent hole 1011 and the first connection hole 1031, the end of the first air tube 30 is connected with the first connection hole 1031, and the gas flowing out of the first vent hole 1011 passes through the first cavity 1035, the first connection hole 1031 and the first air tube 30 in sequence and flows to the detection mechanism. The second cavity 1036 is respectively communicated with the second vent hole 1012 and the second connecting hole 1032, the end of the second air tube 40 is connected with the second connecting hole 1032, and the gas flowing out of the second vent hole 1012 sequentially passes through the second cavity 1036, the second connecting hole 1032 and the second air tube 40 and flows to the detection mechanism.

Optionally, the number of the first ventilation holes 1011 is at least two, each first ventilation hole 1011 is uniformly distributed and arranged along the circumferential direction of the venturi 101, and each first ventilation hole 1011 is communicated with the first cavity 1035. The number of the second vent holes 1012 is at least two, each second vent hole 1012 is uniformly distributed along the circumferential direction of the venturi tube 101, and each second vent hole 1012 is communicated with the second cavity 1036. By providing a plurality of first vents 1011 and second vents 1012, the airflow can be collected at a plurality of locations, thereby enhancing the accuracy of the detection.

In the present embodiment, the controller is electrically connected to the driving mechanism 74, and the controller may control the driving mechanism 74 to operate according to the measured flow rate value to adjust the opening degree of the valve body 7. When the measured flow value is smaller than the preset flow value, the opening degree of the valve body 7 is increased; when the measured flow value is greater than the preset flow value, the opening degree of the valve body 7 is decreased.

Optionally, the barrel 71 is connected directly or indirectly to the tube 103. The cylinder 71 and the tube 103 can be integrated, and the cylinder 71 and the tube 103 can be detachably connected. Illustratively, the barrel 71 and the tube 103 may be connected by flanges or by hoops, or the barrel 71 and the tube 103 may be of a socket structure, i.e., the end of the tube 103 may be inserted into the barrel 71.

Optionally, a pipeline may be further disposed between the cylinder 71 and the pipe 103, the cylinder 71 is detachably connected to one end of the pipeline, and the pipe 103 is detachably connected to the other end of the pipeline. By arranging the pipeline between the cylinder 71 and the pipe body 103, the air valve can be installed according to actual conditions on site.

The detection precision of the Venturi flowmeter is more accurate relative to other flowmeters, so that the Venturi flowmeter can be used in occasions with higher detection precision requirements.

Example two

In this embodiment, the flow sensing device 10 is a pitot tube flow meter. Referring to fig. 15 to 17, the flow sensing device 10 comprises a tubular body 201, a first collection tube 202, a second collection tube 203, and a sensing mechanism. Wherein, the tube body 201 has an air inlet 2011 and an air outlet, the first collection tube 202 is disposed in the tube body 201, the first collection tube 202 extends along the radial direction of the tube body 201, a first vent 2021 is disposed on the tube wall of the first collection tube 202, the first vent 2021 faces the air inlet 2011 of the tube body 201, and the extending direction of the first vent 2021 is parallel to the extending direction (X direction shown in fig. 16) of the tube body 201; the second collecting tube 203 is arranged in the tube body 201, the second collecting tube 203 is located between the first collecting tube 202 and the air outlet end of the tube body 201, the second collecting tube 203 extends along the radial direction of the tube body 201, the tube wall of the second collecting tube 203 is provided with a second vent hole 2031, the second vent hole 2031 faces the air outlet end of the tube body 201, and the extending direction of the second vent hole 2031 is parallel to the extending direction of the tube body 201. The detection mechanism is used for detecting a first pressure value of the gas flowing through the first collecting pipe 202 and a second pressure value of the gas flowing through the second collecting pipe 203, and outputting a difference value between the first pressure value and the second pressure value.

In the present embodiment, according to the pitot tube principle, the total pressure (i.e., the first pressure value) of the air flow is collected through the first air vent 2021, and the static pressure (i.e., the second pressure value) of the air flow is collected through the second air vent 2031, so that the pressure difference between the total pressure and the static pressure of the air flow can be obtained, and the flow rate value of the air flowing through the pipe body 201 can be calculated according to the pressure difference and the bernoulli equation. Since the pressure difference between the full pressure and the static pressure varies in real time according to the actual gas flow rate in the pipe 201, the present embodiment can effectively improve the detection accuracy of the gas flow rate value.

When calculating the gas flow value in the pipe body 201, the gas flow value may be calculated manually by an operator, or the first pressure value and the second pressure value may be transmitted to the control system, and the gas flow value may be output after calculation by the control system. When the flow rate value of the gas is calculated by the control system, the present embodiment further includes: a control cabinet 20, a first air duct 30 and a second air duct 40; the detection mechanism is arranged in the control cabinet 20, one end of the first air pipe 30 is communicated with the second end of the first collection pipe 202, the other end of the first air pipe 30 is communicated with the detection mechanism, and the first air pipe 30 can guide the airflow entering the first collection pipe 202 through the first vent hole 2021 into the detection mechanism so that the detection mechanism detects a first pressure value of the air flowing through the first vent hole 2021; one end of the second air tube 40 is communicated with the second end of the second collecting tube 203, the other end of the second air tube 40 is communicated with the detection mechanism, and the second air tube 40 can guide the air flow entering the second collecting tube 203 through the second vent hole 2031 into the detection mechanism, so that the detection mechanism can detect a second pressure value of the air flowing through the second vent hole 2031. Specifically, in this embodiment, the detection mechanism is a pressure sensor, a controller is further disposed in the control cabinet 20, the controller is electrically connected to the detection mechanism, and the controller can read a difference between a first pressure value and a second pressure value output by the detection mechanism, and calculate a flow value of the gas in the pipe 201 according to the difference and a related formula.

Optionally, the extension direction of the first collection tube 202 is perpendicular to the extension direction of the second collection tube 203.

Optionally, the number of first venting holes 2021 is at least two, each first venting hole 2021 being equally spaced along the extension direction of the first collection tube 202. The number of the second venting holes 2031 is at least two, and the second venting holes 2031 are arranged at equal intervals along the extending direction of the second collection tube 203. By providing a plurality of first and second vent holes 2021, 2031, the flow of air can be collected at a plurality of locations, thereby enhancing the accuracy of detection.

Optionally, the first end of the first collection tube 202 and the first end of the second collection tube 203 are both closed, the first vent hole 2021 and the second end of the first collection tube 202 are in communication with the detection mechanism, and the second vent hole 2031 and the second end of the second collection tube 203 are in communication with the detection mechanism.

Further, in this embodiment, the gas flow value in the pipe 201 can be calculated by a preset formula, where the preset formula is:

wherein q is _v Is the flow rate of the gas in the pipe 201, and has a unit of m ³ S; d is the inner diameter of the tube 201 in m; rho is the density of the gas in kg/m ³ (ii) a Δ p is the difference between the first pressure value and the second pressure value in Pa.

The preset formula can be derived according to a first derivation formula, a second derivation formula and a third derivation formula, and the first derivation formula, the second derivation formula and the third derivation formula are respectively described as follows:

the first derivation formula is:

p _q -p _j ＝p _d

The second derivation formula is:

wherein p is _d Dynamic pressure value in Pa; ρ is the density of the gas in kg/m ³ (ii) a v is the flow velocity of the gas in the tube 201 in m/s.

The third derivation formula is:

wherein q is _v Is the flow rate value of the gas in the pipe body 201, and is expressed in m ³ S; d is the inner diameter value of the pipe body 201, and the unit is m; v is the flow rate of the gas in the tube 201 in m/s.

Optionally, the barrel 71 is connected directly or indirectly to the tube 201. The cylinder 71 and the pipe 201 can be of an integrated structure, and the cylinder 71 and the pipe 201 can also be detachably connected. Illustratively, the barrel 71 and the tube 201 can be connected by flanges or by hoops, or the barrel 71 and the tube 201 can be in a socket structure, i.e., the end of the tube 201 can be inserted into the barrel 71.

Optionally, a pipeline may be further disposed between the cylinder 71 and the pipe 201, the cylinder 71 is detachably connected to one end of the pipeline, and the pipe 201 is detachably connected to the other end of the pipeline. By providing a conduit between the barrel 71 and the pipe 201, the damper can be installed according to actual conditions at the site.

Because first collection tube 202 and second collection tube 203 in a pitot tube flow meter are easily replaced, they can be used in applications where dust is heavy or where the environment is relatively harsh. When the first vent hole 2021 and the second vent hole 2031 are blocked by dust in air, the operator only needs to draw the first collection tube 202 and the second collection tube 203 out of the tube body 201, and the replacement can be realized.

EXAMPLE III

In this embodiment, the flow rate detection device 10 is an orifice flowmeter. Referring to fig. 18 to 21, the flow rate detecting device 10 includes: tube 301, well plate 302, and detection mechanism. The tube body 301 has an air inlet end 3011 and an air outlet end, and the wall of the tube body 301 is provided with a first air vent 3012 and a second air vent 3013 arranged at intervals along the axial direction (X direction shown in fig. 19) of the tube body 301; the orifice plate 302 is arranged in the pipe body 301, the orifice plate 302 is arranged perpendicular to the axial direction of the pipe body 301, the first vent hole 3012 is positioned between the orifice plate 302 and the air inlet end 3011 of the pipe body 301, the second vent hole 3013 is positioned between the orifice plate 302 and the air outlet end of the pipe body 301, the edge of the orifice plate 302 is attached to the inner wall of the pipe body 301, a through hole 3021 is arranged at the center of the orifice plate 302, and the diameter (shown as the dimension D1 in fig. 19) of the through hole 3021 is smaller than the inner diameter (shown as the dimension D in fig. 19) of the pipe body 301; the detection mechanism is used for detecting a first pressure value of the gas flowing through the first vent hole 3012 and a second pressure value of the gas flowing through the second vent hole 3013, and outputting a difference value between the first pressure value and the second pressure value.

In this embodiment, the tubular body 301 with the orifice plate is formed into a venturi tube by providing the orifice plate 302 with the through hole 3021 in the tubular body 301, and the diameter of the through hole 3021 is smaller than the inner diameter of the tubular body 301. According to the venturi principle, the gas flowing through the pipe body 301 is partially contracted while passing through the through hole 3021, resulting in an increase in the flow rate, so that the pressure value (i.e., the second pressure value) of the gas after passing through the through hole 3021 is smaller than the pressure value (i.e., the first pressure value) of the gas before passing through the through hole 3021. In the embodiment, the detection mechanism detects the first pressure value and the second pressure value to obtain the pressure difference between the first pressure value and the second pressure value, so that the gas flow rate flowing through the pipe body 301 can be calculated according to the pressure difference and the bernoulli equation. Since the pressure difference between the first pressure value and the second pressure value varies in real time according to the actual condition of the gas flow in the pipe 301, the present embodiment can effectively improve the detection accuracy of the gas flow value.

Alternatively, referring to fig. 20, a tip portion 3022 is provided on the circumferential surface of the through hole 3021, the tip portion 3022 is provided near the air inlet end 3011 of the tube body 301 and the tip portion 3022 is provided annularly around the circumferential surface of the through hole 3021, the tip portion 3022 is directed to the center of the through hole 3021, and the diameter of the hole formed by the tip portion 3022 (dimension d2 as shown in fig. 20) is smaller than the diameter of the through hole 3021 (dimension d1 as shown in fig. 20); when the gas flows through the pipe body 301, the gas flow path is shown by a broken line L in fig. 19.

When calculating the gas flow rate value in the pipe 301, the gas flow rate value may be calculated manually by an operator, or the first pressure value and the second pressure value may be transmitted to the control system, and the gas flow rate value may be output after calculation by the control system. When the flow rate value of the gas is calculated by the control system, the present embodiment further includes: a control cabinet 20, a first air duct 30 and a second air duct 40. The detection mechanism is arranged in the control cabinet 20, one end of the first air pipe 30 is communicated with the first vent hole 3012, the other end of the first air pipe 30 is communicated with the detection mechanism, and the first air pipe 30 can guide the airflow passing through the first vent hole 3012 to the detection mechanism so that the detection mechanism can detect a first pressure value of the gas flowing through the first vent hole 3012; one end of the second air pipe 40 is communicated with the second vent hole 3013, the other end of the second air pipe 40 is communicated with the detection mechanism, and the second air pipe 40 can guide the air flow passing through the second vent hole 3013 to the detection mechanism, so that the detection mechanism detects a second pressure value of the air flowing through the second vent hole 3013. Specifically, in this embodiment, the detection mechanism is a pressure sensor, the control cabinet 20 is further provided with a controller, the controller is electrically connected to the detection mechanism, and the controller can read a difference between a first pressure value and a second pressure value output by the detection mechanism and calculate a flow value of the gas in the pipe 301 according to the difference and a correlation formula.

Further, in this embodiment, the first pressure value and the second pressure value are both static pressure values, and the gas flow rate value in the pipe 301 can be calculated by a preset formula, the preset formula is derived by a bernoulli equation, and the preset formula is:

wherein q is _v Is the flow rate value of the gas in the pipe body 301, and is expressed in m ³ S; c is the gas outflow coefficient, and epsilon is the gas expansibility coefficient; d is the diameter of the hole formed by tip 3022 (dimension d2 as shown in fig. 20) in m; β is the ratio of the diameter of the hole formed by tip 3022 to the inner diameter of tube body 301 (dimension D as shown in fig. 20); ρ is the density of the gas in kg/m ³ (ii) a Δ p is the difference between the first pressure value and the second pressure value in Pa.

Alternatively, referring to fig. 21, the number of the first ventilation holes 3012 is at least two, each first ventilation hole 3012 is uniformly arranged along the circumferential direction of the tube body 301, and each first ventilation hole 3012 is communicated with the first air tube 30 through a communication air tube and a communication joint. The number of the second ventilating holes 3013 is at least two, each second ventilating hole 3013 is arranged uniformly along the circumference of the tube body 301, and each second ventilating hole 3013 is communicated with the second air tube 40 through a communicating air tube and a communicating joint. By providing a plurality of first ventilation holes 3012 and second ventilation holes 3013, the airflow can be collected at a plurality of positions, thereby enhancing the accuracy of detection.

Optionally, barrel 71 is connected directly or indirectly to tube 301. The cylinder 71 and the pipe body 301 can be of an integrated structure, and the cylinder 71 and the pipe body 301 can also be detachably connected. Illustratively, barrel 71 and tube 301 may be connected by flanges, or by a hoop, or barrel 71 and tube 301 may be of a female configuration, i.e., the end of tube 301 may be inserted into barrel 71.

Optionally, a pipeline may be further disposed between the cylinder 71 and the pipe body 301, the cylinder 71 is detachably connected to one end of the pipeline, and the pipe body 301 is detachably connected to the other end of the pipeline. By providing a conduit between the barrel 71 and the pipe body 301, the damper can be installed according to actual conditions on site.

Due to the simple structure of the orifice plate flowmeter, the orifice plate flowmeter has the advantage of low processing cost. In addition, the orifice plate flowmeter can be made of stainless steel, so that the orifice plate flowmeter can be applied to environments with high corrosivity.

Example four

In this embodiment, the flow rate detection device 10 is an impeller flowmeter. As shown in fig. 22, the impeller flowmeter and the transmission mechanism 3 are both installed inside the cylinder 71, a support beam 401 is provided inside the cylinder 71, the support beam 401 is located in the upstream direction of the blade 72, the flow rate detection device 10 is provided on the support beam 401, and the flow rate detection device 10 includes:

at least one anemometer 402, wherein the anemometer 402 is a vane anemometer, and a rotation surface of a vane of the vane anemometer can be perpendicular to an extending direction of the cylinder 71;

Optionally, the vane wheel type anemometer includes a support and a vane wheel, the support is fixed to the support beam 401, the vane wheel is capable of rotating relative to the support, the detection unit includes a multi-pole magnetic ring and a hall sensor, the multi-pole magnetic ring is embedded in the vane wheel, and the hall sensor is fixedly disposed on the support. By detecting the rotational speed of the impeller, the gas flow rate value in the cylinder 71 can be calculated.

The impeller flowmeter is suitable for the environment with large gas vortex airflow. The impeller flowmeter measures the average wind speed of a surface because the contact area of the impeller flowmeter and the gas is large. Compared with other flow detection devices adopting point measurement modes, the impeller flowmeter is slightly interfered by local vortex airflow, and the measurement precision of the wind speed is not seriously influenced, so that the detection result is accurate.

The above four embodiments are further detailed descriptions of the flow rate detection device 10, and it cannot be assumed that the specific structure of the flow rate detection device 10 is limited to these descriptions. All equivalent implementations or modifications that do not depart from the scope of the present invention are intended to be included within the scope of the present patent.

Alternatively, referring to fig. 3, the housing 1 is a rectangular parallelepiped, and the air inlet 11 and the air outlet 12 are disposed opposite to each other (as shown in fig. 1), or the air inlet 11 and the air outlet 12 are respectively disposed on two surfaces perpendicular to each other on the housing 1 (as shown in fig. 2).

Optionally, a connecting piece 51 is connected to the first orifice plate 5, the first orifice plate 5 is fixed to the inner wall of the housing 1 through the connecting piece 51, the first orifice plate 5 is arranged opposite to the air inlet 11, a certain distance is left between the first orifice plate 5 and the air inlet 11, and the first orifice plate 5 can perform rectification and uniform flow on the air flow entering the housing 1.

Optionally, the second orifice plate 6 covers the outside of the air outlet 12, the second orifice plate 6 is spaced from the bottom of the filter 2, and the second orifice plate 6 can perform rectification and flow dispersion functions on the air flow flowing out of the casing 1. Illustratively, the second orifice plate 6 may be bolted to the housing 1.

Optionally, the filter 2 includes a frame and a filter material disposed inside the frame, specifically, the frame is rectangular, and the periphery of the frame is attached to the inner wall of the housing 1.

Optionally, referring to fig. 3, the aerosol filter further includes a detection tube 9, an air inlet end of the detection tube 9 is connected to the aerosol generating device, an air outlet end of the detection tube 9 is disposed in a gap between the first orifice plate 5 and the air inlet 11, and the aerosol generating device can input aerosol to the upstream of the filter 2 through the detection tube 9. Whether the filter 2 is failed or not can be detected by arranging the aerosol generating device, the detection pipe 9 and the aerosol detection device. When the detection is carried out, the aerosol generating device leads the aerosol into the detection pipe 9, the aerosol flows into the upstream of the filter 2 through the detection pipe 9, and then the aerosol is filtered by the filter 2. The handheld sampling head of measurement personnel places the sampling head in the low reaches of filter 2 to scan between the internal wall of frame and casing 1 and between the low reaches terminal surface, filtering material and the frame of whole filter 2. The sampling head is connected with an alarm, if the filtering performance of the filter 2 is good and the installation sealing performance of the filter 2 is good, the filter 2 can absorb aerosol, and the alarm cannot give an alarm. If the filtering performance of the filter 2 is poor or the installation tightness of the filter 2 is poor, the aerosol flows to the downstream of the filter 2 through the filter 2, the aerosol is detected by the sampling head, and then the alarm device gives an alarm.

Optionally, a fixing pressing sheet 8 is further disposed in the inner cavity of the housing 1, the fixing pressing sheet 8 is detachably connected to the inner wall of the housing 1, and an upper surface of the fixing pressing sheet 8 contacts with the bottom surface of the filter 2 to limit the downward movement of the filter 2. For example, the fixing pressing sheet 8 can be clamped on the inner wall of the housing 1, and can also be fixed on the inner wall of the housing 1 through bolts.

Optionally, the outside of the air inlet 11 is provided with an outwardly protruding flange 13, and the flange 13 is used for connecting the cylinder 71.

Optionally, a lifting lug 14 is arranged on the housing 1, and the lifting lug 14 is used for fixing the housing 1.

The utility model discloses an embodiment still provides a ventilation system, including aforementioned any kind of air supply arrangement and tuber pipe 50, air supply arrangement passes through the flange with tuber pipe 50 and links to each other.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing is a more detailed description of the invention, and the specific embodiments thereof are not to be considered as limiting. Various changes in form and detail, including simple deductions or substitutions, may be made by those skilled in the art without departing from the spirit and scope of the invention.

Claims

1. An air supply device, comprising:

the air conditioner comprises a shell, a fan and a controller, wherein an inner cavity is formed in the shell, and an air inlet and an air outlet are formed in the shell;

a first orifice plate disposed between the air inlet and the filter;

the second pore plate is arranged at the air outlet;

the valve body is connected with the air inlet and comprises a cylinder body and a plurality of blades arranged in the cylinder body, and the blades can rotate in the cylinder body to adjust the opening of the valve body.

2. The air supply arrangement as recited in claim 1 wherein each of said vanes is arranged circumferentially around said barrel, said vanes being fan-shaped, said valve body further comprising:

in the closed state, the side ends of the adjacent blades are attached to each other, and the side ends extend along the radial direction of the cylinder;

in the open state, the side ends of the adjacent blades are separated.

3. The blowing apparatus of claim 2, wherein the actuator drives each of the vanes to rotate synchronously through the same angle about its respective axis of rotation to switch the valve body between the closed and open positions.

4. The air supply arrangement as claimed in claim 2, wherein said drive mechanism is connected to at least one of said shafts, and said drive mechanism is disposed within said barrel, said drive mechanism comprising:

the mounting cylinder is arranged inside the cylinder body, the axis of the mounting cylinder is overlapped with the axis of the cylinder body, and the mounting cylinder is fixed on the cylinder body through a support frame;

the second bevel gear is arranged at the other end of the mounting cylinder and can rotate around the mounting cylinder, teeth distributed along the circumferential direction are arranged on the first bevel gear and the second bevel gear respectively, the teeth on the first bevel gear and the teeth on the second bevel gear are arranged oppositely, and each blade surrounds the outer sides of the first bevel gear and the second bevel gear;

the second bevel gears are arranged between the teeth of the first bevel gear and the second bevel gears, and the second bevel gears are meshed with the teeth of the first bevel gear and the teeth of the second bevel gears.

5. The air supply arrangement as recited in claim 2, wherein said drive mechanism is disposed outside said barrel, said drive mechanism comprising:

the driving mechanism is used for driving the first transmission parts to rotate forwards or backwards along the circumferential direction so as to synchronously drive each second transmission part, so that each second transmission part drives the corresponding blade to rotate forwards or backwards around the respective rotating shaft;

in the process that the first transmission part rotates in the circumferential direction, the valve body is switched from the closed state to the open state;

in the process that the first transmission part rotates along the circumferential direction in the reverse direction, the valve body is switched from the open state to the closed state.

6. The air supply apparatus of any of claims 1 to 5, further comprising flow rate detection means provided upstream of the valve body for detecting a flow rate of the gas entering the air supply apparatus.

7. The blowing device according to claim 6, wherein the flow rate detection device meter includes:

the venturi tube is arranged in the extending direction of the venturi tube, the inner diameter of the middle of the venturi tube is smaller than that of the air inlet end of the venturi tube, a first vent hole and a second vent hole are formed in the venturi tube, the first vent hole is arranged close to the air inlet end of the venturi tube, the second vent hole is formed in the side wall of the position, where the inner diameter of the venturi tube is the smallest, the second vent hole extends in the radial direction of the venturi tube, and the second vent hole is communicated with the inner cavity of the venturi tube;

8. The blowing device according to claim 6, wherein the flow rate detection device meter includes:

a tube body having an inlet end and an outlet end;

the first collecting pipe is arranged in the pipe body and extends along the radial direction of the pipe body, a first air vent is arranged on the pipe wall of the first collecting pipe and faces to the air inlet end of the pipe body, and the extending direction of the first air vent is parallel to the extending direction of the pipe body;

the second collecting pipe is arranged in the pipe body and is positioned between the first collecting pipe and the air outlet end of the pipe body, the second collecting pipe extends along the radial direction of the pipe body, a second vent hole is formed in the pipe wall of the second collecting pipe, the second vent hole faces the air outlet end of the pipe body, and the extending direction of the second vent hole is parallel to the extending direction of the pipe body;

the detection mechanism is used for detecting a first pressure value of the gas flowing through the first collection pipe and a second pressure value of the gas flowing through the second collection pipe and outputting a difference value of the first pressure value and the second pressure value.

9. The blowing device according to claim 6, wherein the flow rate detection device meter includes:

the air inlet pipe comprises a pipe body and a pipe body, wherein the pipe body is provided with an air inlet end and an air outlet end, and the pipe wall of the pipe body is provided with a first vent hole and a second vent hole which are arranged at intervals along the axial direction of the pipe body;

10. An air supply device as set forth in claim 6, wherein a support beam is provided in the cylinder, the support beam being located in an upstream direction of the blade, the flow rate detecting device being provided on the support beam, the flow rate detecting device including:

the anemoscope is a vane anemoscope, and the rotating surface of a vane of the vane anemoscope can be perpendicular to the extending direction of the cylinder;

11. The air supply device according to any one of claims 1 to 5, wherein the casing is a rectangular parallelepiped, and the air inlet and the air outlet are disposed to face each other, or the air inlet and the air outlet are respectively disposed on two surfaces perpendicular to each other on the casing.

12. The air supply arrangement as recited in claim 11, wherein a connector is connected to the first orifice plate, the first orifice plate is fixed to an inner wall of the housing through the connector, the first orifice plate is disposed opposite to the air inlet, and a distance is provided between the first orifice plate and the air inlet.

13. The air supply arrangement as recited in claim 12 wherein said second orifice plate covers the exterior of said air outlet, said second orifice plate being spaced a distance from the bottom of said filter.

14. The air supply arrangement of claim 13, further comprising a detection tube, an air inlet end of the detection tube being connected to an aerosol generating device, an air outlet end of the detection tube being disposed in a gap between the first orifice plate and the air inlet, the aerosol generating device being capable of inputting aerosol upstream of the filter through the detection tube.

15. The air supply apparatus as claimed in claim 11, wherein a fixing pressing piece is further provided in the inner chamber of the housing, the fixing pressing piece is detachably attached to an inner wall of the housing, and an upper surface of the fixing pressing piece is in contact with a bottom surface of the filter to restrict downward movement of the filter.

16. The air supply arrangement as recited in claim 11, wherein an outwardly projecting flange is provided on an outer side of said air inlet for connection to said barrel.

17. The blowing apparatus of claim 11, wherein a lifting lug is provided on the housing, the lifting lug being adapted to secure the housing.

18. A ventilation system characterized by comprising the air supply device of any one of claims 1 to 17.

19. A laboratory characterized in that a roof or a wall of the laboratory is provided with the air supply device of any one of claims 1 to 17.