CN218377020U - Turbofan and breathing machine - Google Patents

Abstract

The utility model relates to a turbofan technical field provides turbofan and breathing machine. The turbo fan includes: the volute is internally provided with an air inlet cavity and is provided with an air inlet communicated with the air inlet cavity; the impeller is arranged in the volute and comprises a wheel disc and blades, and the blades are positioned on one side of the wheel disc, which faces the air inlet cavity; along the direction of the air inlet end of the blade towards the air outlet end of the blade, the air guide gap between the blade and the cavity wall of the air inlet cavity is gradually reduced. According to the utility model discloses a turbofan, when the air current got into towards the air inlet end, the air current can get into the great part of interval in wind-guiding clearance gently from the external world, the velocity of flow that can avoid getting into the air current in wind-guiding clearance like this reduces, along with along the air current flow direction, the space of impeller and spiral case reduces gradually, the air current in the wind-guiding clearance obtains the pressurization like this, the velocity of flow is accelerated, so not only can reduce turbofan's volume loss, and can reduce the gas loss in the spiral case, improve the efficiency of fan.

Description

Turbofan and breathing machine

Technical Field

The utility model relates to a fan technical field especially relates to a turbofan and breathing machine.

Background

The centrifugal impeller of the turbo fan axially enters air and radially exits air, and the centrifugal force is utilized to do work to enable the air to improve pressure.

In the process of impeller rotation in the related art, because the blades of the impeller are arranged towards the inner wall of the air inlet cavity of the volute, gas loss can be generated between the impeller and the volute, and the working efficiency of the turbofan is reduced.

SUMMERY OF THE UTILITY MODEL

The utility model provides a turbofan can reduce the gas loss between impeller and the spiral case, improves turbofan's work efficiency.

The utility model also provides a breathing machine.

According to the utility model provides a turbofan, include:

the volute is internally provided with an air inlet cavity, and the volute is provided with an air inlet communicated with the air inlet cavity;

the impeller is arranged in the volute and comprises a wheel disc and blades, and the blades are positioned on one side, facing the air inlet cavity, of the wheel disc;

and along the direction from the air inlet end of the blade to the air outlet end of the blade, the air guide gap between the blade and the cavity wall of the air inlet cavity is gradually reduced.

According to the utility model discloses a turbofan, along the air inlet end orientation of blade in the direction of the air-out end of blade, the blade with wind-guiding clearance between the chamber wall of air inlet chamber reduces gradually, also promptly, along the air current flow direction, the space of impeller and spiral case reduces gradually, when the air current gets into towards the air inlet end, because the wind-guiding clearance between the chamber wall of blade and air inlet chamber is great, consequently, the air current can get into the great part of interval in wind-guiding clearance from external gently, can avoid getting into the velocity of flow in wind-guiding clearance like this and reduce, along with along the air current flow direction, the space of impeller and spiral case reduces gradually, the air current in the wind-guiding clearance obtains the pressurization like this, the velocity of flow is accelerated, so not only can reduce turbofan's volume loss, and can reduce the gas loss in the spiral case, improve the efficiency of fan.

According to the utility model discloses an embodiment, along the direction of admitting air, the bore of air intake reduces earlier the increase afterwards.

According to an embodiment of the present invention, the minimum diameter of the air inlet is D1, the air inlet end of the blade has a maximum height position protruding from the surface of the wheel disc, the maximum height position is located on a concentric circle of the wheel disc, the diameter of the concentric circle is D2, and the diameter of the wheel disc is D3;

wherein D1 is not less than D2 is not less than 1.5 multiplied by D1, and/or, 1.5 multiplied by D2 is not less than 2.5 multiplied by D3.

According to an embodiment of the invention, the blades are curved in a direction opposite to the direction of rotation of the impeller, and the outlet angle of the blades is α, α =40 ° to 50 °.

According to one embodiment of the present invention, a spiral flow passage is formed between the edge of the impeller and the inner surface of the volute, and the cross-sectional area of the spiral flow passage increases in a streamline shape along the direction of the air flow,

and/or the presence of a gas in the atmosphere,

the blades are provided with a bulge height protruding out of the surface of the wheel disc, the bulge height is gradually reduced from the axis of the wheel disc to the edge of the wheel disc,

and/or the presence of a gas in the gas,

and the end face of the air inlet end of the blade is gradually close to the axis of the rotary disc along the direction of the air inlet facing the rotary disc.

According to the utility model discloses an embodiment, turbofan still includes:

the motor is connected the impeller, including stator and the rotor of coaxial setting, the rotor is installed in the bearing through the installation axle, the bearing with install the compensating ring between the rotor.

According to the utility model discloses an embodiment, the motor includes the motor support, the spiral case with the motor support includes the first overlap joint portion and the second overlap joint portion of mutually supporting, first overlap joint portion with at least one of them mounting groove in the second overlap joint portion is provided with, be fixed with the sealing washer in the mounting groove, the sealing washer seal in first overlap joint portion with between the second overlap joint portion.

According to one embodiment of the present invention, the second overlapping portion of the motor bracket is provided with a plurality of the mounting grooves, which are coaxially arranged,

and/or the presence of a gas in the atmosphere,

the sealing ring is an O-shaped sealing ring.

According to one embodiment of the present invention, the first housing is a resin housing,

and/or the second shell is a resin shell,

and/or the impeller is a resin impeller.

According to an embodiment of the second aspect of the present invention, a ventilator is provided, which includes the above-mentioned turbo fan.

According to the utility model discloses breathing machine, it includes above-mentioned turbofan, consequently has all technological effects of above-mentioned turbofan, and it is no longer repeated here.

Drawings

In order to more clearly illustrate the technical solutions of the present invention or the prior art, the following briefly introduces the drawings required for the embodiments or the prior art descriptions, and obviously, the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic cross-sectional structural view of a turbofan provided by the present invention;

fig. 2 is a schematic structural diagram of an impeller provided by the present invention;

fig. 3 is a schematic side view of the turbofan according to the present invention.

Reference numerals:

100. a volute; 110. a first housing; 120. a second housing; 121. a first lap joint portion; 130. An air inlet cavity; 140. an air inlet;

200. an impeller; 210. a wheel disc; 220. a blade; 230. an impeller insert;

300. a spiral flow channel;

400. a motor; 410. a stator; 420. a rotor; 430. installing a shaft; 440. a bearing; 450. A balance ring; 460. a C-shaped ring; 470. a first motor bracket; 471. a second lap joint portion; 472. Mounting grooves; 473. a seal ring; 480. a second motor support; 490. a motor substrate.

Detailed Description

Embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.

In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

The following describes the turbo fan and the ventilator of the present invention with reference to fig. 1 to 3.

Referring to fig. 1, a turbo fan according to an embodiment of the present invention includes a volute 100 and an impeller 200. An air inlet cavity 130 is formed inside the volute 100, and the volute 100 is provided with an air inlet 140 communicated with the air inlet cavity 130; the impeller 200 is installed inside the volute 100, the impeller 200 comprises a disk 210 and blades 220, and the blades 220 are located on one side of the disk 210 facing the air inlet chamber 130; along the direction from the air inlet end of the blade 220 to the air outlet end of the blade 220, the air guide gap between the blade 220 and the wall of the air inlet cavity 130 is gradually reduced. Referring to fig. 1, "along the direction from the air inlet end of the vane 220 to the air outlet end of the vane 220, the air guiding gap between the vane 220 and the wall of the air inlet chamber 130 gradually decreases", that is, L1 > L2 > L3, where the air guiding gap may refer to a distance between the wall of the vane 220 away from the disk 210 and a portion of the wall of the air inlet chamber 130 corresponding to the wall of the vane 220.

According to the utility model discloses a turbofan, on the direction of the air-out end towards blade 220 along the air inlet end of blade 220, the wind-guiding clearance between the chamber wall of blade 220 and air inlet chamber 130 reduces gradually, that is, on the air current flow direction, impeller 200 reduces gradually with spiral case 100's space, when the air current advances towards the air inlet end, because the wind-guiding clearance between the chamber wall of blade 220 and air inlet chamber 130 is great, therefore, the air current can get into the great part of interval in wind-guiding clearance gently from the external world, can avoid the velocity of flow of the air current that gets into the wind-guiding clearance like this to reduce, along with on the air current flow direction, impeller 200 reduces gradually with spiral case 100's space, the air current in the wind-guiding clearance like this obtains the pressurization, the velocity of flow is accelerated, so not only can reduce turbofan's volume loss, and can reduce the gas loss in the spiral case 100, improve the efficiency of fan.

In fig. 1, L2, and L3 gradually change gently, that is, the air guiding gap between the impeller 200 and the scroll casing 100 is reduced in a streamline shape, so that air volume loss and noise caused by sudden changes of the air guiding gap can be avoided.

Referring to fig. 1, along the air intake direction, the diameter of the air inlet 140 decreases first and then increases, and the air inlet 140 is substantially flared. The intake vent 140 of this configuration facilitates improved flow velocity distribution through the intake vent 140. On one hand, the air inlet 140 is beneficial to reducing the pressure loss of the fan and improving the working efficiency of the fan. On the other hand, this structure reduces the noise at the fan inlet 140. Specifically, the air inlet 140 includes a first air inlet section with an aperture gradually decreasing along the air inlet direction, and the structure thereof is favorable for pouring the airflow outside the volute 100 into the volute 100, so as to reduce the pressure loss of the fan and improve the fan efficiency. The air inlet 140 further includes a second air inlet section with an aperture gradually increasing along the air inlet direction, which is beneficial to shield the noise of the fan inside the volute 100, thereby reducing the noise transmitted from the fan to the outside of the volute 100.

In fig. 1 and 2, the minimum diameter of the air inlet 140 is D1, the air inlet end of the blade 220 has the maximum height position protruding from the surface of the disk 210, the maximum height position is located on a concentric circle of the disk 210, the diameter of the concentric circle is D2, and the diameter of the disk 210 is D3. Wherein D1 is not less than D2 is not less than 1.5 × D1, which is favorable for smooth guiding of the airflow to the wheel disc 210 of the impeller 200 after passing through the air inlet 140 of the volute 100, thereby reducing the volume loss of the fan and improving the efficiency of the fan. In addition, 1.5 × D2 is not more than 2.5 × D3, and when the blades 220 and the wheel disc 210 adopt the size relationship, the noise generated during the operation of the turbofan can be further reduced.

In fig. 2, the vane 220 is curved in a direction opposite to the rotation direction of the impeller 200. When the blades 220 are bent in the opposite direction of the rotation direction, the airflow distribution on the wheel disc 210 is more uniform than when the blades 220 are bent in the forward direction of the rotation direction, or the airflow is more easily separated from the blades 220 and enters the pressurizing passage in the volute 100 than when the blades 220 are extended in the radial direction of the wheel disc 210, so that the flow loss of the air in the volute 100 is reduced, the efficiency of the fan is improved, and the noise caused by the turbulent flow of the air is avoided.

In one embodiment, the vanes 220 are curved in a direction opposite to the direction of rotation of the impeller 200, and the outlet angle of the vanes 220 is α, α =40 ° -50 °. The angle is more favorable for the formation of airflow, and the airflow loss can be further reduced.

In fig. 3, a spiral flow passage 300 is formed between the edge of the impeller 200 and the inner surface of the scroll casing 100, and the cross-sectional area of the spiral flow passage 300 increases in a streamline shape along the gas flow direction. By adopting the structure, the phenomenon that airflow forms vortex or backflow in the volute 100 is effectively relieved, the gas is discharged, the gas flow loss is reduced, the efficiency of the fan is improved, and the noise caused by gas turbulence is avoided.

In one embodiment, the blades 220 have a protrusion height protruding from the surface of the disk 210, the protrusion height gradually decreasing from the axis of the disk 210 toward the edge of the disk 210. That is, the thickness of the portion of the blade 220 protruding from the disk 210 gradually decreases along the direction from the axis of the disk 210 to the edge of the disk 210, when the impeller 200 works, gas flows from the axis of the disk 210 to the edge of the disk 210, the flowing direction of the gas is the same as the decreasing direction of the height of the protrusion, and then the main blade 220 can pressurize the gas better when rotating. The blades 220 may be detachably mounted on the surface of the wheel disc 210, or the blades 220 may be integrally connected with the wheel disc 210 (fixedly connected in a non-detachable manner), or the blades 220 may be integrally formed with the wheel disc 210.

In one embodiment, the air inlet end face of the blade 220 is gradually close to the axial center of the disk 210 along the direction from the air inlet 140 to the disk 210. The vanes 220 are configured to facilitate directing the airflow from the air inlet 140 to the bottom of the disk 210 to pressurize and split the airflow.

In fig. 1, a scroll casing 100 includes a first casing 110 and a second casing 120, the first casing 110 and the second casing 120 are integrally mounted, and a space for mounting an impeller 200 is formed between the first casing 110 and the second casing 120. In which the aforementioned air inlet chamber 130 can be formed only inside the first casing 110. Of course, it is not excluded that the air inlet chamber 130 is formed inside the first housing 110 and inside the second housing 120 at the same time. The first housing 110 and the second housing 120 can be fixed together by welding, bonding, clipping, fastening, or integrally forming.

According to the utility model discloses an embodiment combines fig. 1 and fig. 3, first casing 110 and second casing 120 fall into two parts to gas flow path, and wherein, the arrow point of inner circle corresponds rotatory runner, and the outer lane arrow point corresponds the outflow runner, and rotatory runner's diameter is close with impeller 200 diameter to do benefit to the rotatory energy of rational utilization impeller 200, improve the efficiency of fan.

Referring to fig. 1, the turbo fan further includes a motor 400, wherein the motor 400 is connected to the impeller 200 to rotate the impeller 200 relative to the scroll casing 100.

The motor 400 includes a motor bracket (refer to the first motor bracket 470 and the second motor bracket 480 in the figure, and it is obvious that the structural form of the motor bracket is not limited by the examples herein), wherein the scroll casing 100 and the motor bracket include a first bridging portion 121 and a second bridging portion 471 which are matched with each other, at least one of the first bridging portion 121 and the second bridging portion 471 is provided with a mounting groove 472, a sealing ring 473 is fixed in the mounting groove 472, and the sealing ring 473 is sealed between the first bridging portion 121 and the second bridging portion 471. Through the setting of sealing washer 473, can effectively prevent gas leakage, avoided the noise that gas leakage caused. The volute 100 and the motor bracket can be directly fixed by extrusion through the deformation of the sealing ring 473, and at this time, the deformation of the sealing ring 473 enables a larger friction force to be formed between the sealing ring 473 and at least one of the overlapping parts, so that the separation between the volute 100 and the motor bracket is avoided. The structure is simple, the volute 100 and the motor support are convenient to disassemble or assemble, labor can be saved, and the preparation cost of the turbofan is controlled. Of course, various combinations of the above connection manners may be adopted, for example, the scroll casing 100 and the motor bracket may be fixed by pressing and deforming the sealing ring 473, and at the same time, the scroll casing 100 and the motor bracket may be fixed by gluing.

In fig. 1, the second overlapping part 471 of the motor bracket is provided with a plurality of mounting grooves 472, and the plurality of mounting grooves 472 are coaxially disposed. Correspondingly, a plurality of sealing rings 473 can be installed in the plurality of installation grooves 472. Further, a plurality of seals are provided by a plurality of sealing rings 473 to further ensure the sealing effect between the scroll casing 100 and the motor support. Moreover, when the scroll casing 100 and the motor bracket are fixed by the deformation of the sealing ring 473, the greater the number of the sealing ring 473 is, the more the coupling force between the scroll casing 100 and the motor bracket is increased, so as to prevent the scroll casing 100 and the motor bracket from being separated, and ensure the effectiveness of the connection between the scroll casing 100 and the motor bracket.

In fig. 1, the seal 473 is an O-ring. Of course, the form of the seal ring 473 is not limited to the examples given herein.

In one embodiment, referring again to fig. 1, the turbine includes a stator 410 and a rotor 420 coaxially arranged, the rotor 420 is mounted to a bearing 440 by a mounting shaft 430, and a balancing ring 450 is mounted between the bearing 440 and the rotor 420. The existence of the balance ring 450 can be used as a balancing weight, and the problem of noise caused by vibration of the motor 400 in the rotation process of the motor 400 is effectively avoided. The balance ring 450 may be made of a soft material (e.g., brass) to ensure that the motor 400 is easily handled during dynamic balance correction. The soft material here may be, but is not limited to, brass.

According to the embodiment of the present invention, the material of the volute 100 and the impeller 200 is not limited. In one case, in order to control the weight of the motor 400 and secure the rotation speed of the impeller 200, the impeller 200 may be used as at least one of the first casing 110, the second casing 120, and the impeller 200.

To prevent the impeller 200 from spinning, the impeller 200 may be interference fit with the mounting shaft 430 by an impeller insert.

In fig. 1, the motor 400 is a dc brushless motor 400, and includes a second motor bracket 480, a rotor 420, a stator 410, a motor 400 substrate, and a first motor bracket 470. The rotor 420 includes a mounting shaft 430, a bearing 440, a C-ring 460, a balancing ring 450, and a magnet.

According to an embodiment of a second aspect of the present application, there is provided a ventilator employing the above-described turbofan. Furthermore, the breathing machine has high working efficiency and low noise.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims (10)

1. A turbofan, comprising:

the volute is internally provided with an air inlet cavity, and the volute is provided with an air inlet communicated with the air inlet cavity;

the impeller is arranged inside the volute and comprises a wheel disc and blades, and the blades are positioned on one side, facing the air inlet cavity, of the wheel disc;

and the air guide gap between the blade and the cavity wall of the air inlet cavity is gradually reduced along the direction from the air inlet end of the blade to the air outlet end of the blade.

2. The turbofan of claim 1 wherein the diameter of the inlet vent decreases and increases along the air intake direction.

3. The turbofan of claim 1, wherein the minimum diameter of the air inlet is D1, the air inlet end of the blade has a maximum height position protruding from the surface of the wheel disc, the maximum height position is located on a concentric circle of the wheel disc, the diameter of the concentric circle is D2, and the diameter of the wheel disc is D3;

wherein D1 is more than or equal to D2 is more than or equal to 1.5 multiplied by D1, and/or 1.5 multiplied by D2 is more than or equal to 2.5 multiplied by D3.

4. The turbofan of claim 1 wherein the blades are curved in a direction opposite to a direction of rotation of the impeller and the outlet angle of the blades is α, α =40 ° to 50 °.

5. The turbofan according to claim 1 wherein a spiral flow path is formed between an edge of the impeller and an inner surface of the volute, the spiral flow path having a cross-sectional area that increases in a streamline shape in an airflow direction,

and/or the presence of a gas in the atmosphere,

the blades are provided with a bulge height protruding out of the surface of the wheel disc, the bulge height is gradually reduced from the axis of the wheel disc to the edge of the wheel disc,

and/or the presence of a gas in the gas,

and the end face of the air inlet end of the blade is gradually close to the axis of the rotary disc along the direction of the air inlet facing the rotary disc.

6. The turbofan of any one of claims 1 to 5 wherein the turbofan further comprises:

the motor is connected the impeller, including stator and the rotor of coaxial setting, the rotor is installed in the bearing through the installation axle, the bearing with install the gimbal between the rotor.

7. The turbofan of claim 6 wherein the motor includes a motor bracket, the volute and the motor bracket including first and second cooperating lands, at least one of the first and second lands being provided with a mounting groove having a sealing ring secured therein, the sealing ring being sealed between the first and second lands.

8. The turbofan of claim 7 wherein the second strap portion of the motor mount is provided with a plurality of the mounting slots, the mounting slots being coaxially disposed,

and/or the presence of a gas in the gas,

the sealing ring is an O-shaped sealing ring.

9. The turbofan according to any one of claims 1 to 5 wherein the volute comprises a first housing and a second housing, the first housing and the second housing being integrally mounted, a space for mounting the impeller being formed between the first housing and the second housing;

the first shell is a resin shell, and the first shell is a resin shell,

and/or the second shell is a resin shell,

and/or the impeller is a resin impeller.

10. A ventilator comprising a turbo fan according to any one of claims 1 to 9.

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