CN211039119U - Roof fan with adjustable air volume - Google Patents
Roof fan with adjustable air volume Download PDFInfo
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- CN211039119U CN211039119U CN201922167244.XU CN201922167244U CN211039119U CN 211039119 U CN211039119 U CN 211039119U CN 201922167244 U CN201922167244 U CN 201922167244U CN 211039119 U CN211039119 U CN 211039119U
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Abstract
The utility model discloses a roof fan with adjustable air volume, which comprises a ventilation pipe, an air volume measuring device, a power component, an adjusting air valve and an air collecting cylinder; the ventilation pipe comprises a plurality of straight wind cylinders with the same section, two ends of the ventilation pipe are respectively connected with the wind gathering cylinder and the adjusting air valve, and the power assembly is arranged in the ventilation pipe to accelerate the flow velocity of the airflow; the air quantity measuring device is arranged in the adjusting air valve and comprises an impeller type probe. The utility model discloses the beneficial effect who gains: the impeller type probe can measure the air volume in the roof fan in real time and feed back to the central controller in a pulse signal mode, and the central controller accurately and intelligently adjusts the air volume in the roof fan to be the required air volume; the polyurethane material with good heat insulation effect is adopted, so that the heat insulation effect is achieved, and the condition that condensed water occurs due to temperature difference is avoided; the ventilation pipe is split, so that the transportation is convenient, and the cost is reduced; simple structure, convenient installation and maintenance in the future.
Description
Technical Field
The utility model relates to a ventilation field, concretely relates to amount of wind adjustable roof fan.
Background
A ventilation device is usually hung on the roof of a culture place, so that the air quality of the culture place is improved; in summer, the ventilation device is used for cooling and dehumidifying the farm due to hot air temperature and much rainwater and high humidity; in winter, the temperature is cold, so that the farm needs to be sealed and insulated; however, the existing ventilation device only has ventilation function and cannot keep warm, and the ventilation air quantity cannot be adjusted.
Although the prior art has been devised in response to the above problems, certain drawbacks still remain. For example, the novel CN207777230U roof fan with the automatic air output regulation function comprises a base, an air duct is fixed on the base, a motor is fixed in the air duct, fan blades are fixed on an output shaft of the motor, a rain-proof cap is fixed at the upper end of the wind barrel, the rain-proof cap is a hemispherical cap cover with a hollow inner part, four rectangular openings are evenly distributed on the outer wall of the cap, an arc-shaped plate is arranged in each rectangular opening, the outer wall of the upper end of the arc-shaped plate is fixed at the lower end of the T-shaped block, two parallel pull rods are fixed at the upper end of the T-shaped block, the pull rod penetrates through the deep end of the outer wall of the cap cover and is sleeved on the limiting seat, the limiting seat is fixed on the inner wall of the cap cover, the pull rod penetrates through the extending end of the limiting seat and is fixedly provided with a baffle plate, a spring is sleeved on the pull rod, and two ends of the spring are pressed on the baffle plate and the end surface of the limiting seat respectively; the arc-shaped plate, the T-shaped block, the pull rod and the baffle are made of light nylon materials. The air quantity adjusting mode of the project is that when the fan blade is driven by the motor to rotate, the fan blade sucks air on the lower side of the air duct into the inner cavity of the cap, when the air quantity in the cap is too large, the air pressure is increased, the arc-shaped plate is ejected outwards by the air pressure, when the arc-shaped plate is slowly separated from the rectangular opening of the cap, the area of an air outlet is slowly increased, and the air quantity in the cap can be discharged outdoors; when the air displacement needs to be increased, the rotating speed of the motor is increased, the air pressure is improved, the arc-shaped plate is far away from the cap, and therefore the air outlet volume is adjusted. Although the roof fan can realize automatic adjustment of air output, the roof fan cannot quantitatively adjust the air output and monitor the air output in real time; in addition, the roof fan does not have a heat preservation effect; and the structure is complex, which not only increases the production cost, but also is inconvenient for installation and maintenance in the future.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, an object of the utility model is to provide an amount of wind adjustable roof fan, it includes ventilation pipe, amount of wind measuring device, power component, adjusts the blast gate and holds together the dryer, and this amount of wind adjustable roof fan has simple structure, be convenient for installation and maintain in the future, amount of wind intelligent regulation, amount of wind regulation are accurate, roof fan efficient, rain-proof, have thermal-insulated heat retaining advantage.
In order to realize the purpose of the utility model, the utility model adopts the following technical scheme:
a roof fan with adjustable air volume comprises a ventilation pipe, an air volume measuring device, a power assembly, an adjusting air valve and an air collecting cylinder;
the ventilation pipe comprises a plurality of straight air cylinders with the same section, the adjacent straight air cylinders are fixedly connected through pipe clamps, two ends of the ventilation pipe are respectively connected with the adjusting air valve and one end of the wind gathering cylinder, the other end of the adjusting air valve is the air inlet end of the roof fan, and the other end of the wind gathering cylinder is the air outlet end of the roof fan;
the power assembly comprises a variable frequency motor and a wind wheel; the variable frequency motor is arranged in the ventilation pipe, the wind wheel is arranged on an output shaft of the variable frequency motor, and the wind wheel rotates along with the output shaft;
the adjusting air valve comprises a shell and an air valve actuator, one end of the shell is connected with the ventilation pipe, the other end of the shell is the air inlet end, a rotating shaft is arranged on the shell, a thin-wall circular plate which rotates along with the rotating shaft is arranged on the rotating shaft, and the air valve actuator is connected with the rotating shaft;
the air quantity measuring device comprises an impeller type probe and a signal wire, the impeller type probe is arranged in the shell, the axis of the impeller type probe is overlapped with the axis of the ventilation pipe, and the signal wire is connected with the impeller type probe and the central controller.
Preferably, the casing comprises a straight cylinder section and a flared section connected with the straight cylinder section, the straight cylinder section is connected with the ventilation pipe, the end with the largest diameter of the flared section is the air inlet end, the inner diameter and the outer diameter of the straight cylinder section are equal to the inner diameter and the outer diameter of the ventilation pipe, the rotating shaft, the thin-wall circular plate and the impeller type probe are all arranged in the straight cylinder section, the impeller type probe is close to the air inlet end relative to the thin-wall circular plate, namely the impeller type probe is arranged between the thin-wall circular plate and the air inlet end, through the arrangement, the air flow rate is equal to the cross section area of an air pipe with air speed ×, the casing comprises a straight cylinder section and a flared section, the cross section area of the flared section is larger than the cross section area of the straight cylinder section, the air flow rate in the flared section is equal to the air flow rate in the casing, the air flow rate in the flared section is smaller than the air flow rate in the straight cylinder section according to a formula, the air flow rate in the impeller type probe is ×, and the area of the impeller type probe is set according to the rotation of the impeller type probe, so that the air flow rate in the straight cylinder section is set.
Preferably, the axial distance between the center of the impeller type probe and the air inlet end along the ventilation pipe ranges from 150mm to 200mm, the axial distance between the center of the impeller type probe and the center of the wind wheel along the ventilation pipe ranges from 800mm to 900mm, through the arrangement, the air inlet direction of the air inlet end of the flaring section is different, namely the air inlet end of the flaring section can enter air from all directions, if the axial distance between the center of the impeller type probe and the air inlet end along the ventilation pipe is too small, the accuracy of the measurement result of the impeller type probe can be reduced, and the axial distance between the center of the impeller type probe and the air inlet end along the ventilation pipe ranges from 150mm to 200mm, so that the impeller type probe is arranged at the air inlet section where airflow flows uniformly, stably and parallelly, therefore, the accuracy of the measuring result of the impeller type probe can be improved; and because the airflow near the inlet and the outlet of the wind wheel spirally flows under the driving of the wind wheel, the airflow is relatively disordered, if the axial distance between the center of the impeller type probe and the center of the wind wheel along the ventilation pipe is too small, the accuracy of the measurement result of the impeller type probe can be reduced, and the range of the axial distance between the center of the impeller type probe and the center of the wind wheel along the ventilation pipe is 800mm-900mm, which is the same as the above, so that the accuracy of the measurement result of the impeller type probe is further improved.
Preferably, a gap exists between the outer edge of the impeller type probe and the inner wall of the straight cylinder section, the size range of the gap is 3-5mm, and by means of the arrangement, the measured air volume of the impeller type probe is equal to the rotating area of the impeller type probe with the air speed of ×, the gap between the outer edge of the impeller type probe and the inner wall of the straight cylinder section is 3-5mm, so that the rotating area of the impeller type probe is close to the sectional area of the ventilation pipe under the condition that the impeller type probe does not interfere with the inner wall of the straight cylinder section, the measured air volume of the impeller type probe is close to the actual air volume in the ventilation pipe, and therefore a relatively accurate air volume can be measured, and if the gap is smaller than 3mm, although the accuracy of the measured air volume can be further improved, the improvement degree is not large, and on the contrary, the machining accuracy and the installation accuracy need to be improved, so that the interference between the impeller type probe and the straight cylinder section is avoided, and the production cost is improved.
Preferably, the impeller-type probe comprises three blades which are uniformly distributed at equal angles along the circumferential direction, each blade comprises a front edge and a rear edge, a blade tip connecting line of the front edge and the rear edge is a blade tip width line, a blade root connecting line of the front edge and the rear edge is a blade root width line, the length of the blade tip width line is smaller than that of the blade root width line, and the length of the blade root width line is smaller than that of the blade root width line.
Preferably, an included angle between the blade tip width line and a horizontal plane is a blade tip inclination angle, an included angle between the blade tip width line and the horizontal plane is a blade root inclination angle, an included angle between the blade root width line and the horizontal plane is a blade root inclination angle, the blade tip inclination angle is smaller than the blade root inclination angle, and the blade root inclination angle is smaller than the blade root inclination angle, by setting, according to a formula v ═ r · ω, v is a linear velocity, r is a radius, ω is an angular velocity, when the impeller-type probe operates and rotates, the angular velocity of the impeller-type probe is the same, the linear velocity increases with the increase of the radius, that is, the linear velocity at the blade tip is the fastest and gradually decreases toward the blade root, the width of the blade section gradually increases from the blade tip to the blade root, and the blade inclination angle gradually increases from the blade tip to the blade root, the blade is made to pass through, namely, the wind resistance is reduced when the airflow passes through the impeller type probe, all parts of the blade are stressed more uniformly, the vibration and the deformation of the impeller type probe are reduced, and meanwhile, the airflow entering the straight barrel section from the flaring section is favorably dredged to flow in the direction parallel to the axis of the straight barrel section, so that the eddy current near the impeller type probe is reduced, and the accuracy of the measurement result of the impeller type probe is further improved.
Preferably, the air volume measuring device further comprises a triangular support, the triangular support is arranged in the straight cylinder section, the impeller type probe is fixedly connected with the triangular support, the triangular support is of a hollow structure, one end of the signal wire is connected with the impeller type probe, the other end of the signal wire penetrates out of the hollow structure of the triangular support to be connected with the central controller, and through the arrangement, on one hand, the triangular support is fixedly connected with the impeller type probe, so that the connection stability of the impeller type probe is ensured; on the other hand, the triangular support hardly influences the air inlet amount of the shell; the triangular support is of a hollow structure, so that on one hand, the triangular support is light in weight and hardly influences the overall weight of the roof fan; on the other hand, the signal wire can penetrate through the hollow structure to be connected with the impeller type probe and the central controller, so that the signal wire is convenient to connect, and the signal wire penetrates through the hollow structure to play a certain protection role on the signal wire.
Preferably, the ventilation pipe and the shell are made of polyurethane materials, and through the arrangement, the polyurethane has a good heat insulation effect and can play a role in heat preservation for the interior in winter; and the ventilation pipe and the shell made of polyurethane can effectively avoid the condition that condensed water is formed on the walls of the ventilation pipe and the shell due to large indoor and outdoor temperature difference in winter, and the polyurethane is light in weight and can reduce the overall weight of the roof fan.
Preferably, the wind gathering cylinder is a thin-wall conical cylinder, one end of the wind gathering cylinder with a smaller diameter is a connecting end sleeved with the ventilating pipe, the connecting end is provided with a plurality of longitudinal clamping grooves with downward openings along the circumferential direction, the opening ends of the longitudinal clamping grooves are arranged at the edges of the connecting end, the other ends of the longitudinal clamping grooves are communicated with transverse clamping grooves of the longitudinal clamping grooves, the longitudinal clamping grooves and the transverse clamping grooves form an inverted L-shaped clamping groove, through holes which correspond to the L-shaped clamping grooves in a one-to-one mode are arranged at one end, connected with the wind gathering cylinder, of the ventilating pipe along the circumferential direction, bolt assemblies are arranged in the through holes, the wind gathering cylinder which is a thin-wall conical cylinder is sleeved with the wind gathering cylinder, through experimental tests, compared with a roof fan which is not sleeved with the conical wind gathering cylinder, the wind output can be increased by about 13.9%, the power is reduced by about 12.08%, the wind gathering cylinder is rotated by an operator after the longitudinal clamping grooves are aligned with the bolt assemblies and embedded into the bolt assemblies, so that the wind gathering cylinder is clamped into the transverse clamping grooves, the bolt assemblies are locked, and the wind gathering cylinder can be installed by.
Preferably, the end with the larger diameter of the wind gathering barrel is an air outlet end, the air outlet end of the wind gathering barrel is provided with a top cap, and a plurality of struts which are uniformly distributed at equal angles along the circumferential direction are arranged between the top cap and the wind gathering barrel, so that a gap is formed between the wind gathering barrel and the top cap to serve as an air outlet; on one hand, the support is arranged between the air gathering cylinder and the top cap, so that a gap is formed between the air gathering cylinder and the top cap to serve as an air outlet, and the normal flow of air flow in the roof fan is guaranteed.
Compared with the prior art, the utility model discloses profitable technological effect has been obtained:
1. by adopting the roof fan with the adjustable air volume, the impeller type probe can measure the air volume in the roof fan in real time, the impeller type probe feeds the actual air volume back to the central controller in the form of pulse signals, the pulse signals are transmitted to the central controller through the signal line, and the central controller changes the frequency of the variable frequency motor or drives the air valve actuator to work after analyzing the pulse signals, so that the rotating speed of the variable frequency motor or the ventilation area of the adjusting air valve is changed, the air volume in the roof fan is finally adjusted to be the required air volume, and the intelligent air volume adjustment is realized.
2. The impeller type probe is arranged in the straight cylinder section of the adjusting air valve, and the range of a gap between the outer edge of the impeller type probe and the inner wall of the straight cylinder section is 3-5mm, so that the rotating area of the impeller type probe is close to the sectional area of the ventilation pipe, the measured air volume of the impeller type probe is close to the actual air volume in the ventilation pipe, the accurate air volume can be measured, and the accuracy of air volume adjustment is guaranteed.
3. The axial distance range of the center of the impeller type probe and the air inlet end along the ventilation pipe is between 150mm and 200mm, and the axial distance range of the center of the impeller type probe and the center of the wind wheel along the ventilation pipe is between 800mm and 900mm, so that the impeller type probe is arranged at an air inlet buckling section with uniform, stable and parallel airflow flowing, and the accuracy of the measurement result of the impeller type probe is improved.
4. Because this amount of wind adjustable roof fan is equipped with hold together the dryer, through experimental test, compare and do not cup joint the roof fan that the toper held together the dryer and can promote about 13.9% air output, simultaneously inverter motor's power reduces about 12.08%, has improved roof fan's efficiency widely.
5. Because roof fan is equipped with the hood and can avoid the rainwater to enter into the room through roof fan, plays rain-proof effect, has also avoided the subassembly in the roof fan to intake and break down, moreover the hood with hold together and be equipped with the pillar between the dryer, make the hood with hold together the dryer and form the clearance as the gas outlet, guarantee the normal flow of roof fan air current.
6. Because the ventilating pipe and the shell are both made of polyurethane materials, the polyurethane has good heat insulation effect and has the functions of heat insulation in winter; and avoiding the formation of condensation on the walls of the ventilation duct and the casing.
7. The roof fan is simple in structure and convenient to install and maintain in the future.
Drawings
Fig. 1 is a schematic diagram of an embodiment of the present invention;
fig. 2 is a schematic view of a semicircular straight wind barrel and a partial enlargement thereof according to an embodiment of the present invention;
fig. 3 is a schematic diagram of the top view of fig. 2 and a partial enlargement thereof according to an embodiment of the present invention;
figure 4 is a schematic view of a pipe clamp and its cross section according to an embodiment of the invention;
fig. 5 is a schematic diagram of a partial structure of an embodiment of the present invention;
FIG. 6 is a schematic view of a modulating damper according to an embodiment of the present invention;
fig. 7 is a schematic top view of the embodiment of the present invention with respect to fig. 6;
fig. 8 is a partially enlarged schematic view of an embodiment of the invention with respect to fig. 7;
fig. 9 is a schematic view of a ring cover of an embodiment of the present invention;
fig. 10 is a schematic view of a bolt assembly of an embodiment of the present invention;
FIG. 11 is an isometric view of an impeller probe and triangular bracket connection according to an embodiment of the present invention;
fig. 12 is a schematic front view of fig. 11 according to an embodiment of the present invention.
Wherein, the technical characteristics that each reference numeral refers to are as follows:
1. the wind power generation device comprises a shell, a flaring section, a straight barrel section, a vane wheel type probe, a triangular support, a wind valve actuator, a ventilation pipe, a variable frequency motor, a supporting frame, a wind wheel, a pipe clamp, a notch, a straight barrel, a cavity, a top cap, a ring cover, a fixing nut, a bolt, a fixing piece, a thin-wall circular plate, a rotating shaft, a stainless steel sheet, a split elastic pin, a notch, a groove, a notch, a bolt, a fixing nut, a bolt, a fixing piece, a notch, a thin-wall circular plate, a rotating shaft, a stainless steel sheet, a notch, a.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments, but the scope of the present invention is not limited to the following specific embodiments.
Referring to fig. 1 to 12, the present embodiment discloses a roof fan with adjustable air volume, which is characterized by comprising a ventilation pipe 5, an air volume measuring device, a power assembly, an adjusting air valve and an air collecting cylinder 11;
referring to fig. 1, the ventilation pipe 5 includes a plurality of straight wind barrels 10 having the same section, and the height of the roof fan can be adjusted according to the difference of the indoor height, so that a certain distance is kept between the roof fan and the ground, in this embodiment, the ventilation pipe 5 includes four sections of straight wind barrels 10 having the same section, the ends of the adjacent straight wind barrels 10 are in end-to-end connection, the adjacent straight wind barrels 10 are fixedly connected through pipe clamps 9, two ends of the ventilation pipe 5 are respectively connected with an adjusting wind valve and one end of a wind gathering barrel 11, the other end of the adjusting wind valve is a wind inlet end of the roof fan, and the other end of the wind gathering barrel 11 is a wind outlet end of the roof fan;
referring to fig. 1, the power assembly includes a support frame 7, a variable frequency motor 6 and a wind wheel 8; the supporting frame 7 is arranged in one section of the straight wind barrel 10 of the ventilation pipe 5, the supporting frame 7 is provided with threaded holes, the straight wind barrel 10 is provided with through holes which are in one-to-one correspondence with the threaded holes of the supporting frame 7, the supporting frame 7 is fixedly connected with the straight wind barrel 10 through screws 14, the variable frequency motor 6 is arranged below the supporting frame 7, the variable frequency motor 6 is fixedly connected with the supporting frame 7 through the screws 14, the axis of the output shaft of the variable frequency motor 6 is superposed with the axis of the ventilation pipe 5, a hub of the wind wheel 8 is sleeved on the output shaft of the variable frequency motor 6, the wind wheel 8 can rotate along with the output shaft of the variable frequency motor 6, the variable frequency motor 6 can be adjusted within the frequency range of 5Hz-50Hz, the speed of the wind wheel 8 can be changed from 2003/h～14100m3The/h is adjustable;
referring to fig. 6-8, the adjusting air valve includes a housing 1 and an air valve actuator 4, one end of the housing 1 is connected to a ventilation pipe 5, the other end of the housing 1 is an air inlet end, a rotating shaft 20 is provided on the housing 1, specifically, through holes slightly larger than the diameter of the rotating shaft 20 are provided at two ends of the upper portion of the housing 1 along the radial direction, and are used for matching with the rotating shaft 20, so as to reduce the friction between the housing 1 and the rotating shaft 20 as much as possible and reduce the bounce of the rotating shaft 20; the axis of the rotating shaft 20 is perpendicular to the axis of the shell 1, the rotating shaft 20 extends out of the shell 1 along the radial direction of the shell 1, a thin-wall circular plate 19 rotating along the rotating shaft 20 is arranged on the rotating shaft 20, rectangular notches with the same width as the diameter of the rotating shaft 20 are symmetrically arranged at two ends of the thin-wall circular plate 19 along the diameter direction of the thin-wall circular plate, the length of each rectangular notch is half of that of the rotating shaft 20, stainless steel sheets 21 in a T shape are arranged at the upper end and the lower end, located at the rectangular notch, of the thin-wall circular plate 19, each stainless steel sheet 21 comprises a transverse section and a longitudinal section, and a; through holes penetrating along the radial direction of the rotating shaft 20 are formed in both ends of the rotating shaft 20, one end of the rotating shaft 20 is installed at a rectangular notch of the thin-wall circular plate 19 and clamped between the stainless steel sheets 21, a split elastic pin 22 penetrates through a groove of the stainless steel sheets 21 and is matched with the through hole of the rotating shaft 20 to fix the rotating shaft 20, and the other end of the rotating shaft 20 penetrates through the through hole in the upper part of the shell 1, so that the thin-wall circular plate 19 is fixed in the shell 1 and can rotate around the axis of the rotating shaft 20; the diameter of the thin-wall circular plate 19 is smaller than the inner diameter of the shell 1, the diameter of the thin-wall circular plate 19 is usually 0.95-0.98 times of the inner diameter of the shell 1, friction between the thin-wall circular plate 19 and the inner wall of the shell 1 is avoided, smooth rotation of the thin-wall circular plate 19 is guaranteed, and when the thin-wall circular plate 19 is in a position perpendicular to the axis of the shell 1, ventilation can be blocked to the maximum extent by the thin-wall circular plate 19; the rotating shaft 20 at one end of the air valve actuator 4 is fixedly matched with the air valve actuator 4, a position detector is arranged in the air valve actuator 4, the air valve actuator 4 with the position detector can detect and adjust the opening angle of the thin-wall circular plate 19 in real time, and the opening angle of the thin-wall circular plate 19 can be adjusted from 0 degree to 90 degrees;
referring to fig. 1, the air volume measuring device comprises an impeller type probe 2 and a signal line, wherein the impeller type probe 2 is arranged in a shell 1, the axis of the impeller type probe 2 is overlapped with the axis of a ventilation pipe 5, and the signal line is connected with the impeller type probe 2 and a central controller.
After the roof fan with the adjustable air volume is adopted, the impeller type probe 2 can measure the air volume in the roof fan in real time, the impeller type probe 2 feeds the actual air volume back to the central controller in the form of pulse signals, the pulse signals are transmitted to the central controller through a signal line, and the central controller analyzes the pulse signals, changes the frequency of the variable frequency motor 6 or drives the air valve actuator 4 to work, so that the rotating speed of the variable frequency motor 6 or the ventilation area of the air valve is changed, finally the air volume in the roof fan is adjusted to be the required air volume, and the intelligent air volume adjustment is realized.
2-4, each section of straight wind barrel 10 is formed by combining two semicircular straight wind barrels 13 with the same structure, namely only one set of mould is needed for processing the semicircular straight wind barrels 13, so that the production cost is reduced, the volume of the transportation package is small, and the transportation cost is reduced; the two ends of the two semicircular straight wind cylinders 13, which are in contact with each other, are respectively provided with a convex semicircular rabbet 13.5 and a semicircular groove 13.4 matched with the semicircular rabbet 13.5, the semicircular rabbet 13.5 of one semicircular straight wind cylinder 13 is clamped into the semicircular groove 13.4 of the other semicircular straight wind cylinder 13, the two semicircular straight wind cylinders 13 can be conveniently assembled through the positioning action of the semicircular rabbets 13.5, and the sealing property of the two semicircular straight wind cylinders 13 after being assembled is ensured; after the two semicircular straight wind cylinders 13 are combined into one section of straight wind cylinder 10, a circle of convex trapezoidal spigot 13.3 is arranged at the top end of the straight wind cylinder 10, a trapezoidal groove 13.1 matched with the trapezoidal spigot 13.3 is arranged at the bottom end, and a circle of outer wall groove 13.2 is arranged at the upper part and the lower part of the straight wind cylinder 10, the trapezoidal spigot 13.313 at the top end of one section of straight wind cylinder 10 is clamped into the trapezoidal groove 13.1 at the bottom end of the other section of straight wind cylinder 10, and through the positioning action of the trapezoidal spigot 13.3, the connection and assembly of the two sections of straight wind cylinders 10 are facilitated, and the sealing performance after the two sections of straight wind cylinders 10 are connected is ensured; the pipe clamp 9 is a circular ring with a gap 9.1, a plurality of through holes are formed in the circumferential direction, outwards-turned fastening edges are arranged at two ends of the gap 9.1, and the outwards-turned fastening edges are provided with the through holes; two ends of the pipe clamp 9 along the axial direction are provided with outwards-turned positioning edges, so that the section of the pipe is in a [ -shape. Clamping the outward-turned positioning edge into a groove 13.2 on the outer wall of the connecting part of the two straight air ducts 10, using a bolt 17 to penetrate through a through hole of a clamping edge of the pipe clamp 9, locking a gap 9.1 by using a fixing nut 16, and finally using a screw 14 to penetrate through a through hole at the ring part of the pipe clamp 9 to be fixedly connected with the straight air ducts 10, so that the pipe clamp 9 tightly covers the connecting part of the two straight air ducts 10, the two straight air ducts 10 are connected into a whole, and the good sealing property of the straight air ducts 10 is ensured; after the four sections of straight dryer 10 connect into ventilation pipe 5, the top cover of ventilation pipe 5 is equipped with the ring closure 15 with trapezoidal tang 13.3 looks adaptation, adjusts 1 integrated into one piece of shell of blast gate, and the top of shell 1 be equipped with the trapezoidal tang 13.3 of the trapezoidal recess 13.1 looks adaptation of ventilation pipe 5 bottom, adopt pipe clamp 9 fixed connection after the top of shell 1 is connected with the bottom of ventilation pipe 5, ensure the cylindrical structure of ventilation pipe 5.
Referring to fig. 6, a housing 1 includes a straight tube section 1.2 and a flared section 1.1 connected to the straight tube section 1.2, the flared section 1.1 is located at an air inlet end, the straight tube section 1.2 is connected to a ventilation tube 5, and the inner and outer diameters of the straight tube section 1.2 are equal to the inner and outer diameters of the ventilation tube 5, a rotating shaft 20, a thin-wall circular plate 19 and an impeller probe 2 are all disposed in the straight tube section 1.2, and the impeller probe 2 is close to the air inlet end relative to the thin-wall circular plate 19, i.e., the impeller probe 2 is located between the flared section 1.1 and the air inlet end, so that the impeller probe 2 is conveniently mounted, and the impeller probe 2 is disposed at an air inlet section, the air flow of the air inlet section is uniform, the air flow direction is stable, and the air flow direction flows in parallel according to a pipeline, so as to improve the accuracy of the measurement result of the impeller probe 2, if the impeller probe 2 is disposed at an air outlet section, the air flow of the air outlet section is relatively disordered, so as to reduce the accuracy of the measurement result of the impeller probe 2, the air flow, if the air flow is equal to the cross-flow rate of the straight tube section 1.2, the air flow of the air flow probe 2, the air flow rate is equal to that the cross-air flow rate of the straight tube section 1.2, the cross-tube section 1, the cross-tube section, and the cross-air-flow.
Referring to fig. 1, the axial distance B between the center of the impeller type probe 2 and the air inlet end along the ventilation pipe 5 ranges from 150mm to 200mm, and the axial distance C between the center of the impeller type probe 2 and the center of the wind wheel 8 along the ventilation pipe 5 ranges from 800mm to 900mm, because the air inlet direction of the air inlet end of the flared section 1.1 is different, that is, the air inlet end of the flared section 1.1 can enter air from all directions, if the axial distance B between the center of the impeller type probe 2 and the air inlet end along the ventilation pipe 5 is too small, the accuracy of the measurement result of the impeller type probe 2 can be reduced, in the embodiment, the axial distance B between the center of the impeller type probe 2 and the air inlet end along the ventilation pipe 5 is 180mm, so that the impeller type probe 2 is arranged at the air inlet section where the air flows uniformly, stably and in parallel, and the accuracy of the measurement result of the impeller type probe 2; and because the air current near the import and export of wind wheel 8 is the spiral flow under the drive of wind wheel, the air current is more disorderly, if the axial distance C along the ventilation pipe of the center of impeller formula probe 2 and the center of wind wheel 8 is undersize, also can reduce the precision of impeller formula probe 2 measurement, and the axial distance C along the ventilation pipe of the center of impeller formula probe 2 and the center of wind wheel 8 is 850mm, the same with above-mentioned principle, further improve the precision of impeller formula probe 2 measurement result.
Referring to fig. 1, a gap a exists between the outer edge of the impeller probe 2 and the inner wall of the straight cylinder section 1.2, the size range of the gap a is 3-5mm, and the measured air volume of the impeller probe 2 is equal to the rotating area of the impeller probe 2 with the air speed of ×, in this embodiment, the gap a between the outer edge of the impeller probe 2 and the inner wall of the straight cylinder section 1.2 is 4mm, so that the rotating area of the impeller probe 2 is close to the sectional area of the ventilation pipe 5 under the condition that the impeller probe 2 does not interfere with the inner wall of the straight cylinder section 1.2, and thus the measured air volume of the impeller probe 2 is close to the actual air volume in the ventilation pipe 5, so that accurate air volume can be measured, and if the gap a between the outer edge of the impeller probe 2 and the inner wall of the straight cylinder section 1.2 is less than 3mm, although the accuracy of the measured air volume can be further improved, the improvement degree is not great, but the machining accuracy and the installation accuracy need to be improved, and the interference between the impeller probe 2 and the straight cylinder section 1.2 is avoided, so that.
Referring to fig. 11, the impeller-type probe 2 includes three blades 25 and a rotating base 26, the three blades 25 are uniformly and circumferentially arranged outside the rotating base 26 at equal angles, each blade 25 includes a leading edge 25.3 and a trailing edge 25.4, a connecting line between a blade tip 25.1 of the leading edge 25.3 and a blade tip 25.1 of the trailing edge 25.4 is a blade tip width line, a connecting line between a blade tip of the leading edge 25.3 and a blade tip of the trailing edge 25.4 is a blade tip width line, a connecting line between a blade root 25.2 of the leading edge 25.3 and a blade root 25.2 of the trailing edge 25.4 is a blade root width line, a length D of the blade tip width line is smaller than a length E of the blade tip width line, and a length E of the blade root width line is smaller than a length F of the blade root width line, that is, the width of a section from the blade tip 25.1 to the blade root 25.2 is gradually increased.
Referring to FIG. 12, the angle between the blade tip width line and the horizontal plane is the blade tip inclination angle θ2The included angle between the width line of the leaf and the horizontal plane is the inclination angle theta in the leaf3The included angle between the width line of the blade root and the horizontal plane is the blade root inclination angle theta4Tip angle θ2Less than the angle of inclination in the lobe theta3And angle of inclination in the lobe theta3Less than root angle of inclination theta4According to the formula v ═ r · ω, where v is the linear velocity, r is the radius, ω is the angular velocity, when the vane wheel probe 2 is rotated, the angular velocity of the vane-type probe 2 is the same, and as the radius increases, the linear velocity increases, namely, the linear velocity at the blade tip 25.1 is fastest and gradually decreases towards the blade root 25.2, the width of the section of the blade 25 gradually increases from the blade tip 25.1 to the blade root 25.2, the inclination angle of the blade 25 gradually increases from the blade tip 25.1 to the blade root 25.2, so that the airflow passes through the blade 25, namely, the wind resistance is reduced when the impeller type probe 2 passes through, and all parts of the blades 25 are stressed more uniformly, so that the vibration and deformation of the impeller type probe 2 are reduced, meanwhile, the air flow entering the straight cylinder section 1.2 from the flaring section 1.1 is favorably guided to flow in the direction parallel to the axial line of the straight cylinder section 1.2, thereby reducing the eddy current near the impeller type probe 2 and further improving the precision of the measuring result of the impeller type probe 2.
Referring to fig. 1, the air quantity measuring device further comprises an angle bracket 3, the angle bracket 3 is arranged in a straight cylinder section 1.2, the impeller type probe 2 is fixedly connected with the angle bracket 3, specifically, the rotating base 26 is embedded into a concave hole of the angle bracket 3, a rolling bearing is arranged in the concave hole of the rotating base 26 and the angle bracket 3, an outer ring of the rolling bearing is in interference fit with the concave hole of the angle bracket 3, an inner ring of the rolling bearing is in interference fit with the rotating base 26, on one hand, the angle bracket 3 is fixedly connected with the impeller type probe 2, and the connection stability of the impeller type probe 2 is ensured; on the other hand, the triangular support 3 hardly influences the air inlet amount of the shell 1, namely does not influence the air inlet amount of the roof fan; the triangular support 3 is of a hollow structure, one end of a signal wire is connected with the impeller type probe 2, and the other end of the signal wire penetrates out of the hollow structure of the triangular support 3 to be connected with the central controller, on one hand, the triangular support 3 is of a hollow structure, so that the weight of the triangular support 3 is light, and the integral weight of the roof fan is hardly influenced; on the other hand, the signal wire can pass through the hollow structure to be connected with the impeller type probe 2 and the central controller, so that the signal wire is convenient to connect, and the signal wire penetrates through the hollow structure to play a certain protection role on the signal wire.
The ventilation pipe 5 and the shell 1 are both made of polyurethane materials, and are made of polyurethane through a foaming process, and the polyurethane has a good heat insulation effect and can play a role in heat insulation for the indoor in winter; and the ventilation pipe 5 and the shell 1 made of polyurethane can effectively avoid the condition that condensed water is formed on the walls of the ventilation pipe 5 and the shell 1 due to large indoor and outdoor temperature difference in winter, and the polyurethane is light in weight and can reduce the overall weight of the roof fan.
Referring to fig. 5, the wind gathering cylinder 11 is a thin-wall conical cylinder, and the taper theta of the wind gathering cylinder1The air collecting duct 11 is 7 degrees, so that the air collecting duct 11 is connected with a fan, the air quantity is large, the energy efficiency is high, the end with the smaller diameter of the air collecting duct 11 is a connecting end sleeved with the ventilation duct 5, six longitudinal clamping grooves which are uniformly distributed at equal angles and provided with downward openings are circumferentially arranged at the connecting end, the opening ends of the longitudinal clamping grooves are arranged at the edge of the connecting end, the other end of each longitudinal clamping groove is communicated with a transverse clamping groove of the longitudinal clamping groove, the longitudinal clamping grooves and the transverse clamping grooves form an inverted L-shaped clamping groove 11.1, six cavities 11.2 which are uniformly distributed at equal angles are circumferentially arranged at the connecting end, each cavity 11.2 comprises a fixed surface, a connecting thin wall is arranged between each fixed surface and the inner wall of the connecting end, the L-shaped clamping groove 11.1 is arranged on each connecting thin wall, the structure after the air collecting duct 11 is connected with the ventilation duct 5 is firmer, through holes which correspond to the LThe bolt 17 penetrates through the ventilation pipe 5 and the L-shaped clamping groove 11.1 in sequence from the ventilation pipe 5, the bolt 17 penetrates through the transverse section of the fixing piece 18 and is in threaded connection with the ventilation pipe 5 through the screw 14, so that the fixing piece 18 is fixed to the top end of the ventilation pipe 5, the ring cover 15 is indirectly fixed, the cylindrical structure of the ventilation pipe 5 is ensured, the bolt 17 is indirectly fixed, the bolt 17 cannot rotate when the fixing nut 16 is installed, installation is facilitated, a gasket is sleeved into the bolt 17 extending out of the longitudinal clamping groove, then the bolt 17 is fixed through the fixing nut 16, the wind cone 11 in the form of the cone-shaped wind cone is sleeved on the roof fan, the wind outlet capacity of the fan without the cone-shaped wind cone 11 can be improved by about 13.9%, the wind outlet capacity of the fan can be reduced by about 12.9%, and the power of an operator can be conveniently clamped into the wind cone 11 after the roof fan is sleeved with the cone-shaped wind cone 11, the operator can clamp the wind cone 11 into the wind cone 11, the roof fan can be conveniently clamped into the wind cone 11, and the operator can clamp the wind cone 11, the roof fan can clamp the wind cone 11, and the roof fan can be conveniently connected with the roof fan, and the roof fan, the operator can clamp the roof fan, and the roof fan can clamp the roof fan can be conveniently operated by the roof fan.
Referring to fig. 5, the inner wall of the connecting end is parallel to the outer wall of the ventilation pipe 5, so that the structure of the wind gathering cylinder 11 connected with the ventilation pipe 5 is more stable and firm.
Referring to fig. 1, the end of the wind gathering barrel 11 with the larger diameter is a wind outlet end, the wind outlet end of the wind gathering barrel 11 is provided with a top cap 12, four struts 24 uniformly distributed at equal angles along the circumferential direction are arranged between the top cap 12 and the wind gathering barrel 11, and the two ends of the struts 24 are fixedly connected with the wind gathering barrel 11 and the top cap 12 through screws, so that a gap is formed between the wind gathering barrel 11 and the top cap 12 and serves as a gas outlet 23, on one hand, rainwater can be prevented from entering a room through the wind gathering barrel 11, the ventilation pipe 5 and the housing 1 of the roof fan, and the assembly in the roof fan is prevented from entering water and failing; on the other hand, a gap is formed between the wind gathering barrel 11 and the top cap 12 by a strut 24 to be used as an air outlet 23, so that the normal flow of the air flow in the roof fan is ensured.
The utility model discloses a roof fan's air regulation method is shown as following step:
1) calibrating the impeller type probe 2, placing the impeller type probe 2 in the wind tunnel, enabling the axis of the impeller type probe 2 to be parallel to the axis of the wind tunnel, starting the wind tunnel to generate set air volume, driving the impeller type probe 2 to rotate so as to generate a pulse signal, measuring the pulse signal generated by the current impeller type probe 2, and measuring data of a plurality of groups of air volumes and the pulse signal to obtain the linear relation of the impeller type probe about the air volume and the pulse signal;
2) the impeller type probe 2 is arranged in the roof fan according to the structure, a rated pulse signal is converted according to the required air volume, the rated pulse signal is input into a control system of a central controller, the variable frequency motor 6 is started, the variable frequency motor 6 drives the wind wheel 8 to rotate, the flow velocity of air flow in the roof fan is accelerated, a certain air volume is generated, the impeller type probe 2 is driven to rotate to generate an actual pulse signal, and the actual pulse signal is input into the central controller through a signal line;
3) the central controller compares and analyzes the actual pulse signal with the rated pulse signal:
if the actual pulse signal is equal to the rated pulse signal, the central controller does not adjust the variable frequency motor 6 or the air valve actuator 4;
if the actual pulse signal is smaller than the rated pulse signal, which indicates that the current actual air volume is smaller, the central controller increases the frequency of the variable frequency motor 6, so that the rotating speed of the variable frequency motor 6 is increased, and the wind wheel 8 is driven to generate larger air volume until the actual pulse signal is equal to the rated pulse signal; if the frequency of the variable frequency motor 6 is adjusted to the maximum value and the actual pulse signal is still smaller than the rated pulse signal, the central controller drives the air valve actuator 4 to work, the air valve actuator 4 drives the rotating shaft 20 to rotate, the rotating shaft 20 drives the thin-wall circular plate 19 to rotate, the ventilation area of the air valve is adjusted to be increased, and when the axis of the thin-wall circular plate 19 is vertical to the axis of the ventilation pipe 5, the ventilation area of the air valve is adjusted to be the maximum until the actual pulse signal is equal to the rated pulse signal;
if the actual pulse signal is larger than the rated pulse signal, the current actual air volume is larger, the central controller reduces the frequency of the variable frequency motor 6, so that the rotating speed of the variable frequency motor 6 is reduced, and the air volume generated by the wind wheel 8 is reduced until the actual pulse signal is equal to the rated pulse signal; if the frequency of the variable frequency motor 6 is adjusted to be the minimum value, and the actual pulse signal is still larger than the rated pulse signal, the central controller drives the air valve actuator 4 to work, the air valve actuator 4 drives the rotating shaft 20 to rotate, the rotating shaft 20 drives the thin-wall circular plate 19 to rotate, the ventilation area of the adjusting air valve is reduced, and when the axis of the thin-wall circular plate 19 is overlapped with the axis of the ventilation pipe 5, the ventilation area of the adjusting air valve reaches the minimum value until the actual pulse signal is equal to the rated pulse signal.
When the variable frequency motor 6 of the roof fan is not needed to work, generally, in winter, the air valve drives the thin-wall circular plate 19 to be adjusted to be vertical to the axis of the ventilation pipe 5, namely, the roof fan is in a completely closed state, and the ventilation pipe 5 and the shell 1 are made of polyurethane with good heat insulation effect through a foaming process, so that the heat insulation and moisture preservation effects can be achieved; in general, in summer, the air valve actuator 4 drives the thin-walled circular plate 19 to adjust the axis of the thin-walled circular plate 19 to be perpendicular to the axis of the ventilation pipe 5, that is, the roof fan is in a fully opened state, and natural ventilation in a room is realized by utilizing the principle that hot air rises.
Variations and modifications to the above-described embodiments may occur to those skilled in the art, in light of the above teachings and teachings. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should fall within the protection scope of the claims of the present invention. In addition, although specific terms are used in the specification, the terms are used for convenience of description and do not limit the utility model in any way.
Claims (10)
1. The roof fan with the adjustable air volume is characterized by comprising a ventilation pipe, an air volume measuring device, a power assembly, an adjusting air valve and an air collecting cylinder;
the ventilation pipe comprises a plurality of straight air cylinders with the same section, the adjacent straight air cylinders are fixedly connected through pipe clamps, two ends of the ventilation pipe are respectively connected with the adjusting air valve and one end of the wind gathering cylinder, the other end of the adjusting air valve is the air inlet end of the roof fan, and the other end of the wind gathering cylinder is the air outlet end of the roof fan;
the power assembly comprises a variable frequency motor and a wind wheel; the variable frequency motor is arranged in the ventilation pipe, the wind wheel is arranged on an output shaft of the variable frequency motor, and the wind wheel rotates along with the output shaft;
the adjusting air valve comprises a shell and an air valve actuator, one end of the shell is connected with the ventilation pipe, the other end of the shell is the air inlet end, a rotating shaft is arranged on the shell, a thin-wall circular plate which rotates along with the rotating shaft is arranged on the rotating shaft, and the air valve actuator is connected with the rotating shaft;
the air quantity measuring device comprises an impeller type probe and a signal wire, the impeller type probe is arranged in the shell, the axis of the impeller type probe is overlapped with the axis of the ventilation pipe, and the signal wire is connected with the impeller type probe and the central controller.
2. The roof fan with the adjustable air volume according to claim 1, wherein the outer shell comprises a straight cylinder section and a flared section connected with the straight cylinder section, the straight cylinder section is connected with the ventilation pipe, the end with the largest diameter of the flared section is the air inlet end, and the inner diameter and the outer diameter of the straight cylinder section are equal to the inner diameter and the outer diameter of the ventilation pipe; the rotating shaft, the thin-wall circular plate and the impeller type probe are all arranged in the straight cylinder section, and the impeller type probe is close to the air inlet end relative to the thin-wall circular plate, namely the impeller type probe is positioned between the thin-wall circular plate and the air inlet end.
3. The roof fan with the adjustable air volume according to claim 2, wherein the axial distance between the center of the impeller-type probe and the air inlet end along the ventilation pipe ranges from 150mm to 200mm, and the axial distance between the center of the impeller-type probe and the center of the wind wheel along the ventilation pipe ranges from 800mm to 900 mm.
4. The roof fan with the adjustable air volume as claimed in claim 2, wherein a gap exists between the outer edge of the impeller type probe and the inner wall of the straight cylinder section, and the size of the gap is in a range of 3-5 mm.
5. The roof fan with the adjustable air volume according to claim 2, wherein the impeller-type probe comprises three blades uniformly distributed at equal angles along the circumferential direction, each blade comprises a front edge and a rear edge, a blade tip connecting line between the front edge and the rear edge is a blade tip width line, a blade root connecting line between the front edge and the rear edge is a blade root width line, the length of the blade tip width line is smaller than that of the blade root width line, and the length of the blade root width line is smaller than that of the blade root width line.
6. The wind-adjustable roof fan of claim 5, wherein the included angle between the blade tip width line and the horizontal plane is a blade tip inclination angle, the included angle between the blade leaf width line and the horizontal plane is a blade leaf inclination angle, the included angle between the blade root width line and the horizontal plane is a blade root inclination angle, the blade tip inclination angle is smaller than the blade leaf inclination angle, and the blade leaf inclination angle is smaller than the blade root inclination angle.
7. The roof fan with the adjustable air volume according to claim 2, characterized in that the air volume measuring device further comprises a triangular support, the triangular support is arranged in the straight cylinder section, the impeller type probe is fixedly connected with the triangular support, the triangular support is of a hollow structure, one end of the signal wire is connected with the impeller type probe, and the other end of the signal wire penetrates out of the hollow structure of the triangular support to be connected with the central controller.
8. The roof fan with the adjustable air volume according to claim 1, wherein the ventilation pipe and the housing are both made of polyurethane material.
9. The roof fan with the adjustable air volume according to claim 1, characterized in that the wind gathering cylinder is a thin-walled conical cylinder, the end with the smaller diameter of the wind gathering cylinder is a connecting end sleeved with the ventilation pipe, the connecting end is circumferentially provided with a plurality of longitudinal clamping grooves with downward openings, the opening ends of the longitudinal clamping grooves are arranged at the edges of the connecting end, the other ends of the longitudinal clamping grooves are communicated with transverse clamping grooves of the longitudinal clamping grooves, the longitudinal clamping grooves and the transverse clamping grooves form inverted L-shaped clamping grooves, the end of the ventilation pipe connected with the wind gathering cylinder is circumferentially provided with through holes corresponding to the L-shaped clamping grooves in a one-to-one manner, and the through holes are provided with internal bolt assemblies.
10. The roof fan with the adjustable air volume according to claim 9, wherein the end of the wind gathering cylinder with the larger diameter is the air outlet end, the air outlet end of the wind gathering cylinder is provided with a top cap, and a plurality of struts which are uniformly distributed at equal angles along the circumferential direction are arranged between the top cap and the wind gathering cylinder, so that a gap is formed between the wind gathering cylinder and the top cap and serves as an air outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922167244.XU CN211039119U (en) | 2019-12-05 | 2019-12-05 | Roof fan with adjustable air volume |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922167244.XU CN211039119U (en) | 2019-12-05 | 2019-12-05 | Roof fan with adjustable air volume |
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| CN211039119U true CN211039119U (en) | 2020-07-17 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110805570A (en) * | 2019-12-05 | 2020-02-18 | 广东泛仕达农牧风机有限公司 | Roof fan with adjustable air volume |
| CN113098067A (en) * | 2021-05-08 | 2021-07-09 | 国网上海市电力公司 | Roof fan device and intelligent power generation and temperature and humidity control system thereof |
-
2019
- 2019-12-05 CN CN201922167244.XU patent/CN211039119U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110805570A (en) * | 2019-12-05 | 2020-02-18 | 广东泛仕达农牧风机有限公司 | Roof fan with adjustable air volume |
| CN110805570B (en) * | 2019-12-05 | 2024-12-03 | 广东泛仕达农牧风机有限公司 | A roof fan with adjustable air volume |
| CN113098067A (en) * | 2021-05-08 | 2021-07-09 | 国网上海市电力公司 | Roof fan device and intelligent power generation and temperature and humidity control system thereof |
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