阅读说明：本技术 斜流风机和家电设备 (Diagonal flow fan and household appliance ) 是由 胡小文 张辉 于 2018-05-22 设计创作，主要内容包括：本发明提出了一种斜流风机和家电设备,其中,斜流风机包括：风机罩,风机罩分别开设有进风口；斜流风轮,容置于风机罩内,并设置于进风口的下游；叶片扩压器,容置于风机罩内,并设置于斜流风轮的下游,扩压器能够与风机罩围设出扩压通道；声反射结构,设置于叶片扩压器的下游并与风机罩连接,声反射结构远离叶片扩压器的一端设置有与进风口连通的出风口,声反射结构能够构设出与扩压通道连通的出风风道,出风风道沿出风方向逐渐扩张。通过本发明的技术方案,防止出现出口面积突扩导致的台阶绕路,进而降低突扩损失,也能够防止由于出口的截面面积突扩过大导致出现不稳定的涡流脱离的概率,进而降低气流噪声。(The invention proposes a kind of diagonal flow fan and household appliances, wherein diagonal flow fan includes: fan shroud, and fan shroud offers air inlet respectively；Oblique flow wind wheel, is placed in fan shroud, and is set to the downstream of air inlet；Vane diffuser is placed in fan shroud, and is set to the downstream of oblique flow wind wheel, and diffuser can be enclosed with fan shroud sets out diffusion channel；Sound reflecting structure, it is set to the downstream of vane diffuser and is connect with fan shroud, sound reflecting structure is provided with the air outlet being connected to air inlet far from one end of vane diffuser, sound reflecting structure can structure set out the exhaust air flue being connected to diffusion channel, exhaust air flue is gradually expanded along air-out direction.According to the technical solution of the present invention, it prevents step caused by discharge area sudden expansion to detour, and then reduces sudden expansion loss, can also prevent from leading to occur the probability that unstable vortex is detached from since the area of section sudden expansion of outlet is excessive, and then reduce pneumatic noise.)

1. a kind of diagonal flow fan characterized by comprising

Fan shroud, the fan shroud offer air inlet respectively；

Oblique flow wind wheel is placed in the fan shroud, and is set to the downstream of the air inlet；

Vane diffuser is placed in the fan shroud, and is set to the downstream of the oblique flow wind wheel, and the diffuser can be with The fan shroud, which encloses, sets out diffusion channel；

Sound reflecting structure is set to the downstream of the vane diffuser and connect with the fan shroud, and the sound reflecting structure is remote One end from the vane diffuser is provided with the air outlet being connected to the air inlet, the sound reflecting structure can structure set out The exhaust air flue being connected to the diffusion channel, the exhaust air flue are gradually expanded along air-out direction.

2. diagonal flow fan according to claim 1, which is characterized in that the sound reflecting structure includes:

The outer cylinder section being mutually arranged and interior cover, the outer cylinder section are connected with the fan housing body, and the outer cylinder section is along outlet air Direction is configured to the streamline cylinder segment structure gradually tapered up；

The interior cover is configured to along air-out direction gradually to the arc cover of contract, the arc-shaped cover body can with it is described Streamline cylinder segment structure, which encloses, sets out the exhaust air flue.

3. diagonal flow fan according to claim 2, which is characterized in that

The interior cover is configured to hemispherical cover structure.

4. diagonal flow fan according to claim 2, which is characterized in that

The interior cover is configured to circumferentially to the arc cover reduced between curvature of centre.

5. diagonal flow fan according to claim 2, which is characterized in that the sound reflecting structure further include:

At least one conical flow guiding ring is set between the outer cylinder section and the interior cover, and the conical flow guiding ring edge goes out Gradually to contract while wind wind direction extends, the outlet air wind is set out to enclose respectively with the outer cylinder section and the interior cover Road.

6. diagonal flow fan according to claim 5, which is characterized in that

The beginning of the relatively described outer cylinder section in the beginning of the conical flow guiding ring and the beginning of the interior cover are close to the outlet air Mouthful setting, between the tail end in the diffusion channel and the beginning of the conical flow guiding ring formed by the outer cylinder section with it is described Interior cover encloses exhaust air flue described in the first segment gradually expanded for setting and being formed,

The diffusion angle of exhaust air flue described in first segment is greater than or equal to 7 °, and is less than or equal to 30 °.

7. diagonal flow fan according to claim 6, which is characterized in that

The diffusion angle is greater than or equal to 14 ° and is less than or equal to 30 °.

8. diagonal flow fan according to claim 5, which is characterized in that beginning chamferedization of the conical flow guiding ring is set It sets.

9. diagonal flow fan according to claim 5, which is characterized in that

The maximum outside diameter of the conical flow guiding ring is greater than the minimum diameter of the outer cylinder section；

The minimum diameter of the conical flow guiding ring is less than the maximum outside diameter of the interior cover.

10. diagonal flow fan according to claim 5, which is characterized in that

The conical flow guiding ring is enclosed to set by equal thickness plate body to be formed；Or

The conical flow guiding ring is enclosed to set by airfoil type plate body to be formed,

Wherein, the contour line in the section of the equal thickness plate body is circular arc line or Bezier.

11. diagonal flow fan according to claim 5, which is characterized in that the sound reflecting structure further include:

Multiple gussets are circumferentially laid on the interior cover, and can respectively radially with extend axially outward, with pass through institute Water conservancy diversion ring portion is stated to extend on the inner wall of the outer cylinder section.

12. diagonal flow fan according to claim 11, which is characterized in that

The windward side of the gusset is configured to arc surface.

13. diagonal flow fan according to any one of claim 1 to 12, which is characterized in that

The fan shroud includes the first cover and the second cover being mutually butted, and the oblique flow wind wheel is placed in first cover It is interior, vane diffuser accommodating in second cover, enclose that set out the diffusion logical with the inner wall with second cover Road.

14. a kind of household appliance characterized by comprising

Diagonal flow fan as described in any one of claims 1 to 13.

Technical field

The present invention relates to household appliances fields, in particular to a kind of diagonal flow fan and a kind of household appliance.

Background technique

Diagonal flow fan is also known as flow-mixing blower fan, is increasingly being application in recent years, in the related technology, as shown in Figure 1, Diagonal flow fan is mainly by structure compositions such as collecting cover, motor, impeller and diffusers, and air enters inlet manifold cover by side, so Impeller is entered by a segment pipe afterwards, is rotated by motor band movable vane piece to air work, getting a promotion property of air velocity is at height The air of speed belt rotation, and static pressure also gets a promotion, the air of hyper tape rotation, which enters diffuser, to carry out eliminating rotation and again diffusion, Although at rear portion runner setting vane diffuser interior air-flow be remedied to close to axial direction, the outlet of diffuser also have compared with High flowing velocity can be higher than 10m/s under normal conditions, and there are still following defects in the process of running:

(1) when being directly accessed pipeline or being discharged into user environment, since the outlet high flow velocities in diffuser are by going out It after open area sudden expansion, generates apparent step and streams, and then generate larger sudden expansion loss, the kinetic energy of motor input is less than reasonable benefit With causing energy consumption higher.

(2) the wideband pneumatic noise that the impeller of blower and diffuser inside generate is directly facing user environment or direct spoke It injects into pipeline, it is larger to the influence of noise of external environment.

(3) since the area of section sudden expansion of outlet is excessive, step, which streams, causes unstable vortex to be detached from, and can also give oblique flow Blower brings biggish pneumatic noise.

Summary of the invention

At least one in order to solve the above-mentioned technical problem, it is an object of the present invention to provide a kind of diagonal flow fans.

It is another object of the present invention to provide a kind of household appliances.

To achieve the goals above, the embodiment of first aspect present invention proposes a kind of diagonal flow fan, comprising: blower Cover, fan shroud offer air inlet respectively；Oblique flow wind wheel, is placed in fan shroud, and is set to the downstream of air inlet；Blade expands Depressor is placed in fan shroud, and is set to the downstream of oblique flow wind wheel, and diffuser can be enclosed with fan shroud sets out diffusion channel； Sound reflecting structure is set to the downstream of vane diffuser and connect with fan shroud, sound reflecting structure far from vane diffuser one End is provided with the air outlet being connected to air inlet, sound reflecting structure can structure set out the exhaust air flue being connected to diffusion channel, out Wind air duct is gradually expanded along air-out direction.

In the technical scheme, sound reflecting structure is added by the tail end in diffusion channel, have in sound reflecting structure by The high-speed flow of the exhaust air flue of flaring, the outlet outflow in the diffusion channel of diffuser enters the exhaust air flue gradually expanded In, on the one hand, compared with high-speed flow is directly discharged into access conduit or user environment in the prior art, prevent exit face Step caused by product sudden expansion detours, and then reduces sudden expansion loss, on the other hand, can also prevent the area of section due to outlet prominent Expand the probability of the excessive vortex disengaging for causing to occur unstable, and then reduces pneumatic noise.

Wherein, diffuser includes diffuser ontology, and the multiple diffusion blades being set on diffuser ontology, diffuser Blade can be enclosed with fan shroud sets out diffusion channel.

In addition, the diagonal flow fan in above-described embodiment provided by the invention can also have following additional technical feature:

In the above-mentioned technical solutions, it is preferable that sound reflecting structure includes: the outer cylinder section being mutually arranged and interior cover, outer cylinder Section is connected with fan housing body, and outer cylinder section is configured to the streamline cylinder segment structure gradually tapered up along air-out direction；Interior cover is by structure It is set as along air-out direction gradually to the arc cover of contract, arc-shaped cover body can be enclosed with streamline cylinder segment structure sets out outlet air wind Road.

It in the technical scheme, is the outer cylinder section being mutually arranged and interior cover by sound reflecting structure setting, and passing through will be outer Cylinder section is set as the streamline cylinder segment structure gradually tapered up along air-out direction, to realize sound reflecting effect according to sound reflecting principle, into And the noise given off from diffusion channel is reduced, it is corresponding to set arc cover for interior cover, and then in the inner wall of outer cylinder section Structure sets out the exhaust air flue gradually expanded between the outer wall of interior cover, while reducing energy loss, advantageously reduces gas Flow noise.

In addition, cover structure is an arc knot closed at one end by being interior cover structure by internal structure setting Structure prevents backflow phenomenon while cooperatively forming the exhaust air flue of expansion with outer cylinder section.

As a kind of connection type, outer cylinder section can be fixedly connected with fan shroud, and interior cover can be with vane diffuser Diffuser ontology be fixedly connected.

In any of the above-described technical solution, it is preferable that interior cover is configured to hemispherical cover structure.

In the technical scheme, by the way that interior cover is configured to hemispherical cover structure, on the one hand, can reduce step around The raw probability of miscarriage, on the other hand, structure is relatively easy, prepares more convenient.

In any of the above-described technical solution, it is preferable that interior cover is configured to circumferentially to reducing between curvature of centre Arc cover.

In the technical scheme, interior cover can also be arranged to the arc cover being circumferentially gradually reduced to curvature of centre, To form the streamlined structure that curvature gradually changes, to meet the construction demand of the exhaust air flue of expansion.

In any of the above-described technical solution, it is preferable that sound reflecting structure further include: at least one conical flow guiding ring, setting Between outer cylinder section and interior cover, gradually to contract while conical flow guiding ring extends along air-out wind direction, with respectively and outside Cylinder section and interior cover enclose and set out exhaust air flue.

In the technical scheme, by the way that conical flow guiding ring is arranged between outer cylinder section and interior cover, conical flow guiding ring can be with It is set as cone structure, to be gradually tapered up along air-out direction, by the way that the exhaust air flue in outside is formed between outer cylinder section respectively, with The exhaust air flue that inside is formed between interior cover, realizes the shunting of high-speed flow, and then can reduce the frequency of pneumatic noise, While realizing kinetic energy recycling, the radiated noise in exit can reduce.

When conical flow guiding ring has multiple, multiple conical flow guiding rings edges are laid from inside to outside.

As a kind of connection type, linking arm can be set on conical flow guiding ring, with by linking arm respectively with outer cylinder Section and the connection of interior cover.

In any of the above-described technical solution, it is preferable that beginning and inner cover of the beginning of conical flow guiding ring with respect to outer cylinder section The beginning of body close to air outlet be arranged, between the tail end in diffusion channel and the beginning of conical flow guiding ring formed by outer cylinder section with Interior cover encloses the first segment exhaust air flue gradually expanded for setting and being formed, and the diffusion angle of first segment exhaust air flue is greater than or equal to 7 °, And it is less than or equal to 30 °.

In the technical scheme, high-speed flow is from the diffusion channel outflux of diffuser, flow into first by by outer cylinder section with Interior cover, which encloses, to be set in the first segment exhaust air flue gradually expanded to be formed, and first end exhaust air flue is expanding channel, expanding channel With diffusion angle, the angular range by limiting diffusion angle drops as far as possible while as far as possible to kinetic energy derived from diffusion channel Low flow losses.

In any of the above-described technical solution, it is preferable that diffusion angle is greater than or equal to 14 ° and is less than or equal to 30 °.

In the technical scheme, the angular range of diffusion angle is further decreased, to promote the noise reduction effect of sound reflecting structure, Wherein, if the axial space of sound reflecting structure is shorter, 30 ° of diffusion angle can be used, to promote diffusion effect, if sound When the axial space of catoptric arrangement is longer, 14 ° of diffusion angle can be used, to maximize promotion dynamic pressure, to be converted to static energy, And then influence of noise of the reduction to external environment.

Wherein, by limiting diffusion angle as more than or equal to 14 °, i.e., the beginning of conical flow guiding ring is in starting area of section The position for being more than or equal to 14 ° or so diffusion angles is formed, between the exit area of diffuser to prevent local stoppages Fluid generation accelerates again and brings loss.

In any of the above-described technical solution, it is preferable that beginning chamferedization of conical flow guiding ring is arranged.

In the technical scheme, by the way that the end face at the beginning of conical flow guiding ring is carried out chamfering setting, to promote transmitting The adaptability of the air-flow to come over reduces energy loss.

In any of the above-described technical solution, it is preferable that the maximum outside diameter of conical flow guiding ring is greater than the minimum diameter of outer cylinder section； The minimum diameter of conical flow guiding ring is less than the maximum outside diameter of interior cover.

In the technical scheme, by the way that the maximum outside diameter of conical flow guiding ring to be set greater than to the minimum diameter of outer cylinder section, And the minimum diameter of conical flow guiding ring is less than the maximum outside diameter of interior cover, and in this way as viewed from air outlet, diffuser can be complete It is blocked by conical flow guiding ring and interior cover, i.e., can't see diffuser ontology and diffuser vane completely, to realize diffuser The efficiency that the noise given off is reflected maximizes, and reduces the noise of diagonal flow fan.

In any of the above-described technical solution, it is preferable that conical flow guiding ring is enclosed to set by equal thickness plate body to be formed；Or conical flow guiding Ring is enclosed to set by airfoil type plate body to be formed, wherein the contour line in the section of equal thickness plate body is circular arc line or Bezier.

It in the technical scheme, is in streamline on the surface for realizing conical flow guiding ring by limiting the shape of conical flow guiding ring While type structure, the dynamic pressure of the outlet effluent stream in the diffusion channel of vane diffuser is reverted to static pressure, In as far as possible While promoting diagonal flow fan efficiency, energy consumption is reduced, wherein better static pressure can be obtained using airfoil plate body and restored

In any of the above-described technical solution, it is preferable that sound reflecting structure further include: multiple gussets are circumferentially laid in interior On cover, and can respectively radially with extend axially outward, with pass through water conservancy diversion ring portion extend on the inner wall of outer cylinder section.

In the technical scheme, by being arranged multiple gussets, gusset can respectively with outer cylinder section, conical flow guiding ring and interior Cover connection, on the one hand, realize connection outer cylinder section, guide ring and inner cover body function, it is strong with the structure for promoting sound reflecting structure On the other hand degree can play and air-flow is deflected to circumferential effect.

In any of the above-described technical solution, it is preferable that the windward side of gusset is configured to arc surface.

In the technical scheme, the windward side of gusset is configured to arc surface, gusset tail portion can be reduced and generate fluid whirlpool Stream starting noise additional caused by falling off.

Wherein, the thickness of gusset is unsuitable blocked up.

In any of the above-described technical solution, it is preferable that fan shroud includes the first cover and the second cover being mutually butted, tiltedly Stream wind wheel is placed in the first cover, and vane diffuser accommodating is enclosed with the inner wall with the second cover in the second cover and sets out expansion Pressure passageway.

In any of the above-described technical solution, it is preferable that multiple diffusion blades are circumferentially laid on diffuser ontology, adjacent Two diffusion blades between formed diffusion channel.

Vane diffuser has multiple diffusion blades, realizes diffusion by the channel expansion design between adjacent blades The kinetic energy for the fluid with higher momentum that impeller excludes is converted into pressure energy by function.

The embodiment of second aspect of the present invention proposes a kind of household appliance, the technical solution including first aspect present invention Diagonal flow fan described in middle any embodiment.

Wherein, household appliance can be dust catcher or range hood.

One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

By increasing sound reflecting structure at the air outlet of existing diagonal flow fan, examined first from aerodynamics angle Consider, carry out diffusion for being introduced into sound reflecting structure from the high-speed flow that diffuser exit excludes, and by limiting diffusion angle pair The area of section in diffusion channel optimizes, as far as possible by height derived from the exit in the diffusion channel of vane diffuser The dynamic pressure of fast air-flow reverts to static pressure, and then improves diagonal flow fan efficiency, reduces motor electric quantity consumption.

In addition, the rational design of deflector is reflected the sound wave radiated from vane diffuser as far as possible by case, It blocks sound wave to propagate outward, reduces the noise of diagonal flow fan.

Additional aspect and advantage of the invention will become obviously in following description section, or practice through the invention Recognize.

Detailed description of the invention

Above-mentioned and/or additional aspect of the invention and advantage will become from the description of the embodiment in conjunction with the following figures Obviously and it is readily appreciated that, in which:

Fig. 1 shows the structural schematic diagram of diagonal flow fan in the related technology；

Fig. 2 shows the structural schematic diagrams of diagonal flow fan according to an embodiment of the invention；

Fig. 3 shows the schematic diagram of the section structure of A-A section in Fig. 2；

Fig. 4 shows the cross-section structure signal of the sound reflecting structure in diagonal flow fan according to an embodiment of the invention Figure；

The stereochemical structure that Fig. 5 shows the sound reflecting structure in diagonal flow fan according to another embodiment of the invention is shown It is intended to.

Wherein, corresponding relationship of the Fig. 2 into Fig. 5 between appended drawing reference and component names are as follows:

10 fan shrouds, 20 oblique flow wind wheels, 30 vane diffusers, 40 sound reflecting structures, 402 outer cylinder sections, cover in 404,406 Conical flow guiding ring, 408 gussets, 102 first covers, 104 second covers.

Specific embodiment

To better understand the objects, features and advantages of the present invention, with reference to the accompanying drawing and specific real Applying mode, the present invention is further described in detail.It should be noted that in the absence of conflict, the implementation of the application Feature in example and embodiment can be combined with each other.

In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, still, the present invention may be used also To be implemented using other than the one described here other modes, therefore, protection scope of the present invention is not by described below Specific embodiment limitation.

Referring to the diagonal flow fan of Fig. 2 to Fig. 5 description according to some embodiments of the invention.

As shown in Figure 2 and Figure 3, the diagonal flow fan of embodiment according to the present invention, comprising: fan shroud 10, fan shroud 10 divide Air inlet is not offered；Oblique flow wind wheel 20 is placed in fan shroud 10, and is set to the downstream of air inlet；Vane diffuser 30, It is placed in fan shroud 10, and is set to the downstream of oblique flow wind wheel 20, diffuser can be enclosed with fan shroud 10 sets out diffusion channel； Sound reflecting structure 40 is set to the downstream of vane diffuser 30 and connect with fan shroud 10, and sound reflecting structure 40 expands far from blade One end of depressor 30 is provided with the air outlet being connected to air inlet, sound reflecting structure 40 can structure set out and be connected to diffusion channel Exhaust air flue, exhaust air flue are gradually expanded along air-out direction.

In this embodiment, sound reflecting structure 40 is added by the tail end in diffusion channel, had in sound reflecting structure 40 The high-speed flow of the exhaust air flue gradually expanded, the outlet outflow in the diffusion channel of diffuser enters the exhaust air flue gradually expanded In, on the one hand, compared with high-speed flow is directly discharged into access conduit or user environment in the prior art, prevent exit face Step caused by product sudden expansion detours, and then reduces sudden expansion loss, on the other hand, can also prevent the area of section due to outlet prominent Expand the probability of the excessive vortex disengaging for causing to occur unstable, and then reduces pneumatic noise.

Wherein, diffuser includes diffuser ontology, and the multiple diffusion blades being set on diffuser ontology, diffuser Blade can be enclosed with fan shroud 10 sets out diffusion channel.

In addition, the diagonal flow fan in above-described embodiment provided by the invention can also have following additional technical feature:

As shown in figure 4, in the above embodiment, it is preferable that sound reflecting structure 40 includes: the outer cylinder section 402 being mutually arranged With interior cover 404, outer cylinder section 402 is connected with fan housing body, and outer cylinder section 402 is configured to the stream gradually tapered up along air-out direction Spool segment structure；Interior cover 404 is configured to along air-out direction gradually to the arc cover of contract, and arc-shaped cover body can be with stream Spool segment structure, which encloses, sets out exhaust air flue.

In this embodiment, the outer cylinder section 402 being mutually arranged and interior cover 404 are set by sound reflecting structure 40, and led to It crosses and sets the streamline cylinder segment structure gradually tapered up along air-out direction for outer cylinder section 402, with anti-according to sound reflecting principle realization sound Effect is penetrated, and then reduces the noise given off from diffusion channel, it is corresponding to set arc cover, Jin Er for interior cover 404 Structure sets out the exhaust air flue gradually expanded between the inner wall of outer cylinder section 402 and the outer wall of interior cover 404, is reducing energy loss Meanwhile advantageously reducing pneumatic noise.

In addition, cover structure is an arc closed at one end by being interior 404 structure of cover by internal structure setting Structure prevents backflow phenomenon while cooperatively forming the exhaust air flue of expansion with outer cylinder section 402.

As a kind of connection type, outer cylinder section 402 can be fixedly connected with fan shroud 10, and interior cover 404 can be with leaf The diffuser ontology of piece diffuser 30 is fixedly connected.

In any of the above-described embodiment, it is preferable that interior cover 404 is configured to hemispherical cover structure.

In this embodiment, by the way that interior cover 404 is configured to hemispherical cover structure, on the one hand, can reduce step The probability of generation is streamed, on the other hand, structure is relatively easy, prepares more convenient.

In any of the above-described embodiment, it is preferable that interior cover 404 is configured to circumferentially to reducing between curvature of centre Arc cover.

In this embodiment, interior cover 404 can also be arranged to the arc cover being circumferentially gradually reduced to curvature of centre, To form the streamlined structure that curvature gradually changes, to meet the construction demand of the exhaust air flue of expansion.

As shown in figs. 4 and 5, in any of the above-described embodiment, it is preferable that sound reflecting structure 40 further include: at least one Conical flow guiding ring 406 is set between outer cylinder section 402 and interior cover 404, and conical flow guiding ring 406 extends along air-out wind direction Simultaneously gradually to contract, to enclose with outer cylinder section 402 and interior cover 404 respectively and set out exhaust air flue.

In this embodiment, by the way that conical flow guiding ring 406, conical flow guiding are arranged between outer cylinder section 402 and interior cover 404 Ring 406 can be set to cone structure, to gradually taper up along air-out direction, by forming outside between outer cylinder section 402 respectively Exhaust air flue, between interior cover 404 formed inside exhaust air flue, realize the shunting of high-speed flow, and then can drop The frequency of low-flow noise can reduce the radiated noise in exit while realizing kinetic energy recycling.

When conical flow guiding ring 406 has multiple, multiple conical flow guiding rings 406 are laid along from inside to outside.

As a kind of connection type, linking arm can be set on conical flow guiding ring 406, with by linking arm respectively and outside Cylinder section 402 and interior cover 404 connect.

In any of the above-described embodiment, it is preferable that the beginning of conical flow guiding ring 406 with respect to outer cylinder section 402 beginning and The beginning of interior cover 404 is arranged close to air outlet, to be formed between the tail end in diffusion channel and the beginning of conical flow guiding ring 406 The first segment exhaust air flue gradually expanded for setting and being formed, the diffusion of first segment exhaust air flue are enclosed by outer cylinder section 402 and interior cover 404 Angle is greater than or equal to 7 °, and is less than or equal to 30 °.

In this embodiment, high-speed flow is from the diffusion channel outflux of diffuser, flow into first by by outer cylinder section 402 with Interior cover 404, which encloses, to be set in the first segment exhaust air flue gradually expanded to be formed, and first end exhaust air flue is expanding channel, and expansion is logical Road has diffusion angle, by limiting the angular range of diffusion angle, while as far as possible to kinetic energy derived from diffusion channel, as far as possible Reduce flow losses.

In any of the above-described embodiment, it is preferable that diffusion angle is greater than or equal to 14 ° and is less than or equal to 30 °.

In this embodiment, the angular range of diffusion angle is further decreased, to promote the noise reduction effect of sound reflecting structure 40, Wherein, if the axial space of sound reflecting structure 40 is shorter, 30 ° of diffusion angle can be used, to promote diffusion effect, if When the axial space of sound reflecting structure 40 is longer, 14 ° of diffusion angle can be used, it is quiet to be converted to maximize promotion dynamic pressure Pressure energy, and then reduce the influence of noise to external environment.

Wherein, by limiting diffusion angle as more than or equal to 14 °, i.e., the beginning of conical flow guiding ring 406 is in starting section The position for being more than or equal to 14 ° or so diffusion angles is formed between area and the exit area of diffuser, to prevent part Blocking fluid generation accelerates again and brings loss.

In any of the above-described embodiment, it is preferable that beginning chamferedization of conical flow guiding ring 406 is arranged.

In this embodiment, by the way that the end face at the beginning of conical flow guiding ring 406 is carried out chamfering setting, to promote transmitting The adaptability of the air-flow to come over reduces energy loss.

In any of the above-described embodiment, it is preferable that the maximum outside diameter of conical flow guiding ring 406 is greater than the minimum of outer cylinder section 402 Internal diameter；The minimum diameter of conical flow guiding ring 406 is less than the maximum outside diameter of interior cover 404.

In this embodiment, by the way that the maximum outside diameter of conical flow guiding ring 406 to be set greater than in the minimum of outer cylinder section 402 Diameter, and the minimum diameter of conical flow guiding ring 406 is less than the maximum outside diameter of interior cover 404, in this way as viewed from air outlet, diffuser It can be blocked completely by conical flow guiding ring 406 and interior cover 404, i.e., can't see diffuser ontology and diffuser vane completely, To realize that the efficiency that the noise that diffuser gives off is reflected maximizes, the noise of diagonal flow fan is reduced.

In any of the above-described embodiment, it is preferable that conical flow guiding ring 406 is enclosed to set by equal thickness plate body to be formed；Or taper is led Stream ring 406 is enclosed to set by airfoil type plate body to be formed, wherein the contour line in the section of equal thickness plate body is that circular arc line or Bezier are bent Line.

In this embodiment, by limiting the shape of conical flow guiding ring 406, it is on the surface of realization conical flow guiding ring 406 While streamlined structure, the dynamic pressure of the outlet effluent stream in the diffusion channel of vane diffuser 30 is reverted to as far as possible quiet Pressure reduces energy consumption, wherein it is extensive can to obtain better static pressure using airfoil plate body while promoting diagonal flow fan efficiency It is multiple

As shown in figs. 4 and 5, in any of the above-described embodiment, it is preferable that sound reflecting structure 40 further include: multiple gussets 408, be circumferentially laid on interior cover 404, and can respectively radially with extend axially outward, with pass through water conservancy diversion ring portion extend To the inner wall of outer cylinder section 402.

In this embodiment, by being arranged multiple gussets 408, gusset 408 can respectively with outer cylinder section 402, conical flow guiding Ring 406 and interior cover 404 connect, on the one hand, realize connection outer cylinder section 402,404 function of guide ring and interior cover, to propose On the other hand rising the structural strength of sound reflecting structure 40 can play and air-flow is deflected to circumferential effect.

It is uniformly distributed as one kind preferably embodiment, multiple gussets 408.

In any of the above-described embodiment, it is preferable that the windward side of gusset 408 is configured to arc surface.

In this embodiment, the windward side of gusset 408 is configured to arc surface, 408 tail portion of gusset can be reduced and generate stream Body vortex starting noise additional caused by falling off.

Wherein, the thickness of gusset 408 is unsuitable blocked up.

In any of the above-described embodiment, it is preferable that fan shroud 10 includes the first cover 102 and the second cover being mutually butted 104, oblique flow wind wheel 20 is placed in the first cover 102, in the accommodating of vane diffuser 30 and the second cover 104, to cover with second The inner wall of body 104, which encloses, sets out diffusion channel.

In any of the above-described embodiment, it is preferable that multiple diffusion blades are circumferentially laid on diffuser ontology, adjacent Diffusion channel is formed between two diffusion blades.

Vane diffuser 30 has multiple diffusion blades, is expanded by the channel expansion design between adjacent blades to realize Function is pressed, the kinetic energy for the fluid with higher momentum that impeller excludes is converted into pressure energy.

According to a kind of embodiment of the application, the sound reflecting structure 40 of diagonal flow fan as shown in figs. 4 and 5, structure It specifically includes that

Outer cylinder section 402: streamlined 402 head end of outer cylinder section is realized and the diffusion pipeline of vane diffuser 30 is attached, separately One end is realized and external pipe is connected or directly connect with the external world, and outer cylinder section 402 is the cylinder segment structure of a shrinkage type.

Interior cover 404: the design of interior cover 404 is main to be considered to prevent and reduces the generation that step streams, and interior cover 404 is set Count into streamlined, Qi is total, can be formed with being docked using two half shells, may be designed as the streamlined knot that curvature gradually changes Structure also forms reasonable expanding channel with other components in addition to preventing step from streaming.

Conical flow guiding ring 406: the purpose that conical flow guiding ring 406 is arranged is the effect of pneumatic flowrate distribution, by blade diffusion The airflow portion water conservancy diversion that device 30 is discharged arrives and the expanding channel of the formation of outer cylinder section 402, and fraction is directed to and interior cover 404 The expanding channel of formation.

Gusset 408: gusset 408 plays the role of connecting outer cylinder section 402, conical flow guiding ring 406 and interior cover 404, and portion Divide to play and air-flow is deflected to axial purpose.