CN208804042U - A kind of volute structure of centrifugal blower - Google Patents

Abstract

The utility model relates to a kind of volute structures of centrifugal blower, including the volute tongue with volute tongue inner wall, the two sides closing of volute tongue is to form cavity, the first baffle extended along volute tongue outer wall into cavity is provided on the outside of volute tongue, long and narrow flow-guiding channel is formed between the top and volute tongue inner wall of first baffle, diversion cavity is enclosed between the lower part and cavity inner wall of first baffle, volute tongue inner wall bottom is provided with the opening that gas supply stream enters in diversion cavity, and the baffle that can opening covered or be opened opening is additionally provided in diversion cavity.When compressor flow is smaller, noise is smaller, and baffle can close opening；When compressor flow is larger, reflux of the gas at volute tongue increases, baffle opens opening, portion gas, which is open, to be entered diversion cavity and is discharged after further being accelerated by long and narrow flow-guiding channel from air outlet, realize the secondary discharge of reflux gas, reduce gas backstreaming, abolished eddy current problem, to reduce fan noise, improve fan efficiency.

Description

A kind of volute structure of centrifugal blower

Technical field

The utility model relates to range hood technical fields, refer specifically to a kind of volute structure of centrifugal blower.

Background technique

Domestic cooking fume remover uses multi-blade centrifugal fan, carries out air-breathing, exhaust.Blower is generally by spiral case, motor, impeller Deng composition.Wherein tongue-shaped projection part is referred to as volute tongue in spiral case, and main function is to separate flowing gas, prevents gas in spiral case Internal circulation flow.Due to gas pressure height, complex flow, the flow noise generated near volute tongue, rotational noise near volute tongue It is the Main Noise Sources of centrifugal blower, reducing the noise near volute tongue can significantly reduce range hood noise.

Application publication number is a kind of Chinese patent application " volute of blower for range hood " (Shen of CN105526193A Please number: CN201610111243.1) disclose a kind of structure comprising volute tongue, volute tongue include volute tongue inner wall, and volute tongue forms closing Cavity, at least one longitudinal baffle is disposed with along the axis direction of spiral case in cavity, along the axis direction cloth of vertical spiral case Multiple radial partitions are equipped with, the cavity is separated into multiple independent closed noise reduction cavitys by longitudinal baffle and radial partition, Hole is offered in the corresponding volute tongue inner wall section of each noise reduction cavity.Cavity in volute tongue is separated into multiple independences by above structure Closed areola, the hole thus opened up on areola and corresponding side wall forms Helmholtz resonator, according to Hai Muhuo Hereby resonance principle, after sound transmission comes, close sound wave and resonator generate resonance with the resonator intrinsic frequency, are vibrating In the process, the air column in cavity and cavity inner wall friction and sound energy consumption, to carry out sqouynd absorption lowering noise.

Above structure reduces fan noise by way of noise reduction cavity is arranged to a certain extent, still, due to snail Space is smaller at tongue, and gas is difficult disposably to be discharged, and remaining gas is easy reflux and forms vortex, and fan efficiency is caused to drop It is low, and vortex noise is generated, and then blower is caused still to there is biggish noise.

Utility model content

Whirlpool can be effectively abolished for the current state of the art, the technical problem to be solved by the utility model is to provide a kind of Stream and reduction gas backstreaming are to reduce the volute structure of fan noise, the centrifugal blower for improving fan efficiency.

Technical solution adopted by the utility model to solve the above technical problems is as follows: a kind of volute structure of centrifugal blower, Including volute tongue, the volute tongue has volute tongue inner wall, it is characterised in that: the two sides closing of the volute tongue is described to form cavity Be provided with the first baffle extended along volute tongue outer wall into cavity on the outside of volute tongue, the top of the first baffle in corresponding volute tongue It is formed with long and narrow flow-guiding channel between wall, encloses diversion cavity between the lower part and cavity inner wall of the first baffle, it is described It is provided with the opening that gas supply stream enters in diversion cavity in the position for corresponding to diversion cavity bottom on volute tongue inner wall, is gone back in the diversion cavity It is provided with the baffle that can opening covered or open opening.

As an improvement, being provided in the volute tongue can be adjusted whether baffle is opened and closed relative to opening according to air force Adjust component.Using the structure, when air quantity is smaller, adjusts component and do not act on, conventional structure, that is, meet demand of volute tongue works as wind When measuring larger, adjusts component and drive baffle movement to the opening that will be open under distinguished and admirable impact, vortex and reduction are abolished in performance Gas backstreaming function.

Preferably, the adjusting component includes linking arm, pin shaft and elastic component, and the linking arm is set to the of baffle One end is simultaneously connected on volute tongue side wall by pin shaft with being able to rotate, and the baffle is set to overthe openings and can be in wind with being able to rotate Stream impact is lower to float the opening that will be open upwards, and the second end of the baffle is rotatably mounted end, and the elastic component makes to lead Stream block remains the trend for covering opening.The coefficient of elasticity of elastic component can be specific according to wind pressure, flow of blower fan system etc. Performance parameter setting, to keep the lower noise of blower whether adjusting the closing of opening according to air force.

For the ease of assembly, the elastic component is spring, and the first end of the spring and the upper surface of linking arm offset, should The second end of spring offsets with the volute tongue inner wall above it.Preferably, it is formed on the volute tongue inner wall above the elastic component vertical The plane that straight spring is axially arranged, the second end of the spring offset with the plane；The upper surface of the linking arm offers confession Spring first end holding card slot therein.

It improves again, is provided with second baffle on the outside of the first baffle, the second baffle and volute tongue side wall, first baffle are total With closed first cavity is enclosed, it is provided with first entered in the first cavity for air-flow self-conductance stream chamber on the first baffle and leads to Hole.Preferably, the first baffle with a thickness of 1.5~2mm, the diameter of the first through hole is 1~1.8mm.Using in this way Structure, it can be achieved that the secondary exclusion of reflux gas, and be further reduced vortex, meanwhile, first baffle, second baffle and the two Between the first cavity can form noise elimination resonant structure, to inhibit the turbulence noise at this, realize noise reduction effect.

It is further improved, setting is parallel to the third baffle of second baffle arrangement, the third gear in first cavity Plate and second baffle, volute tongue inner wall enclose the second cavity jointly, be provided in the third baffle for air-flow from the first cavity into Enter the second through-hole of the second cavity.The third baffle with a thickness of 0.75~1mm, the diameter of second through-hole is 0.5~ 0.75mm.Although above-mentioned first baffle, second baffle and the first cavity between the two form noise elimination resonant structure, but Nonlinear acoustic resistance may be generated, and then forms quadratic noise, above-mentioned third baffle and the second cavity are set, can be inhibited wider Noise band, preferably offset original noise, and there is higher acoustic absorptivity, final volute tongue under the conditions of realizing big flow Locate the reduction of noise, the raising of vortex abolished with blower press, efficiency.

In the above embodiments, the spiral case further includes spiral case ring wall, and the volute tongue is connected to the first end of spiral case ring wall On, the volute tongue inner wall includes the first side plate bending, the second side plate bending and the first planar section, and first side plate bending is close to centrifugation wind The impeller arrangement of machine and the first guide face of lower surface composition centrifugal blower, first planar section are set to the air outlet side of spiral case And inner surface constitutes the second guide face of centrifugal blower, second side plate bending be connected to the first side plate bending and the first planar section it Between.

For the ease of connection, the spiral case further includes front shroud, back shroud, and the spiral case ring wall is connected to front shroud with after Between cover board, the volute tongue top edge is connected with front shroud, back shroud top edge, the volute tongue lower edge and spiral case ring wall First end margin is connected and passes through silica gel sealing.

Preferably, the first baffle includes the second planar section and third side plate bending, and second planar section is close to first Planar section arrangement, the upper end of the third side plate bending is mutually connected with the lower end of the second planar section, and the third side plate bending is to second Side plate bending direction is arched upward and lower end is mutually connected with the upper surface of the first side plate bending.Between first planar section and the second planar section The width of the flow-guiding channel of formation is gradually reduced from bottom to top.Diversion cavity is collectively formed with long and narrow flow-guiding channel in above structure General shape is 6 structure, so that playing the role of good water conservancy diversion breaks whirlpool.

Preferably, the lower surface of the baffle is configured to the first cambered surface to arch upward downwards, corresponding, the opening two sides Wall is formed to the mating surface to match with the first cambered surface.The upper surface of the baffle is formed with the second arc to arch upward upwards Face, the radian of second cambered surface are greater than the radian of the first cambered surface, and the round and smooth mistake in junction of first cambered surface and the second cambered surface It crosses.Above structure can reduce baffle to distinguished and admirable resistance.

Compared with the prior art, the advantages of the utility model are: volute tongue two sides are closed and in volute tongues by the utility model Interior setting first baffle, in centrifugal blower use process, when compressor flow is smaller, noise is smaller, and baffle can close opening It closes；When compressor flow is larger, reflux of the gas at volute tongue increases, and is opened opening by baffle, portion gas is through opening Mouth enters diversion cavity and is discharged after further being accelerated by long and narrow flow-guiding channel from air outlet, realizes the secondary of reflux gas Discharge, reduces gas backstreaming, has abolished eddy current problem, to reduce fan noise, improve fan efficiency.

Detailed description of the invention

Fig. 1 is the structural schematic diagram (being equipped with impeller) of the utility model embodiment；

Fig. 2 is the cross-sectional view of Fig. 1；

Fig. 3 is the structural schematic diagram of volute tongue in the utility model embodiment；

Fig. 4 is the assembling structure schematic diagram of baffle and linking arm, elastic component in the utility model embodiment；

Fig. 5 is the cross-sectional view of volute tongue in the utility model embodiment；

Fig. 6 is the structural schematic diagram that baffle is hidden in Fig. 5.

Specific embodiment

The utility model is described in further detail below in conjunction with figure embodiment.

As shown in figs. 1 to 6, the volute structure of the centrifugal blower of the present embodiment include volute tongue 1, front shroud 2, back shroud 3 and Spiral case ring wall 4, front shroud 2 and 3 time interval of back shroud arrange that spiral case ring wall 4 is connected between front shroud 2 and back shroud 3, snail Tongue 1 is set in the first end of spiral case ring wall 4, a side wall of volute tongue 1 side wall and front shroud 2, rear cover opposite with spiral case ring wall 4 Plate 3 encloses air outlet 40 jointly.

The volute tongue 1 of the present embodiment has volute tongue inner wall 11, which includes the first side plate bending 111, the second cambered surface Section 112 and the first planar section 113, impeller arrangement and lower surface composition centrifugal blower of first side plate bending 111 close to centrifugal blower The first guide face, the first planar section 113 be set to spiral case 40 side of air outlet and inner surface constitute centrifugal blower the second water conservancy diversion Face, the second side plate bending 112 are connected between the first side plate bending 111 and the first planar section 113.1 top edge of volute tongue of the present embodiment It is connected with front shroud 2,3 top edge of back shroud by screw, 1 lower edge of volute tongue and the first end margin of spiral case ring wall 4 pass through Screw connection is connected and passes through silica gel sealing.

1 two sides of volute tongue of the present embodiment are respectively arranged with a volute tongue side plate 12, and the volute tongue side plate 12 is by two side seals of volute tongue 1 It closes to be provided on the outside of the volute tongue 1 to forming cavity 10, being open corresponding to cavity 10 and extend along volute tongue outer wall into cavity 10 First baffle 13.First baffle 13 includes the second planar section 131 and third side plate bending 132, and the second planar section 131 is flat close to first Face section 113 arranges that the upper end of third side plate bending 132 is mutually connected with the lower end of the second planar section 131, and third side plate bending 132 is to the Two side plate bendings, 112 direction is arched upward and lower end is mutually connected with the upper surface of the first side plate bending 112.Second planar section of first baffle 13 113 are formed with long and narrow flow-guiding channel 14, and the width of the flow-guiding channel 14 between 131 and the first planar section of volute tongue inner wall 11 It is gradually reduced from bottom to top.Diversion cavity 15, the first side plate bending 111 are enclosed between 10 inner wall of lower part and cavity of first baffle 13 On be provided with the opening 1111 that gas supply stream enters in diversion cavity 15, be additionally provided with and can opening 1111 be covered or will be opened in diversion cavity 15 The baffles 100 that mouth 1111 is opened.The lower surface of baffle 100 is configured to the first cambered surface 101 to arch upward downwards, corresponding, opens 1111 two sidewalls of mouth are formed to the mating surface 1112 to match with the first cambered surface 101.The upper surface of baffle 100 forms oriented On the second cambered surface 102 for arching upward, the radian of second cambered surface 102 is greater than the radian of the first cambered surface 101, and the first cambered surface 101 with The junction rounding off of second cambered surface 102, the structure can reduce baffle 100 to distinguished and admirable resistance.The water conservancy diversion of the present embodiment Chamber 15 and long and narrow flow-guiding channel 14 are collectively formed general shape and are 6 structure, so that playing the role of good water conservancy diversion breaks whirlpool.

The adjusting that can be adjusted according to air force whether baffle 100 is opened and closed relative to opening 1111 is provided in volute tongue 1 Component 16.Adjusting component 16 includes linking arm 161, pin shaft 162 and elastic component 163, and linking arm 161 is two and is connected to The other end of the two sides of 100 first end of baffle, linking arm 161 is connected on volute tongue side plate 12 with being able to rotate by pin shaft 162, And junction is arranged close to the second side plate bending 112.Baffle 100 is set to 1111 top of opening and can be in distinguished and admirable impact with being able to rotate Lower to float 1111 openings that be open upwards, the second end of baffle 100 is rotatably mounted end, and elastic component 163 makes baffle 100 remain the trend for covering opening 1111.The coefficient of elasticity of elastic component 163 can wind pressure, flow according to blower fan system Etc. specific performances parameter setting, thus according to air force adjust opening closing whether, keep the lower noise of blower.This reality The elastic component 163 for applying example is spring, and the first end of the spring and the upper surface of linking arm 161 offset, the second end of the spring and Volute tongue inner wall above it offsets.The plane that uprighting spring is axially arranged is formed on the volute tongue inner wall of 163 top of elastic component 114, the second end of spring offsets with the plane 114.The upper surface of linking arm 161 offers therein for spring first end holding Card slot 1611.

In the present embodiment, it is provided with second baffle 17 on the outside of first baffle 13, the upper end of the second baffle 17 and first The outlet air end of planar section 113 is connected, and the lower end of the second baffle 17 is connected with the outer end of the first planar section 113, thus Closed first cavity 170 is enclosed jointly with volute tongue side plate 12, first baffle 13, is provided on first baffle 13 for air-flow self-conductance Flow the first through hole 130 that chamber 15 enters in the first cavity 170.First baffle 13 with a thickness of 1.5~2mm, first through hole 130 Diameter is 1~1.8mm.Setting is parallel to the third baffle 18 of the arrangement of second baffle 17, the third baffle in first cavity 170 18 enclose the second cavity 180 with second baffle 17, volute tongue inner wall jointly, are provided in third baffle 18 for air-flow from the first cavity 17 enter the second through-hole 181 of the second cavity 18.Third baffle 18 with a thickness of 0.75~1mm, the diameter of the second through-hole 181 is 0.5~0.75mm.Although above-mentioned first baffle 13, second baffle 17 and the first cavity 170 between the two form noise elimination Resonant structure it is also possible to nonlinear acoustic resistance can be generated, and then forms quadratic noise, above-mentioned third baffle 18 and the second chamber is arranged Body 180 can inhibit broader noise band, preferably offset original noise, and have higher acoustic absorptivity, final real The reduction of noise, the raising of vortex abolished with blower press, efficiency at volute tongue under the conditions of existing big flow.

Using the volute structure of the present embodiment, when compressor flow is smaller, noise is smaller, and baffle 100 will be open 1111 It closes；When compressor flow is larger, reflux of the gas at volute tongue 1 increases, and gas shock baffle 100 overcomes elastic component 163 Elastic force floats upwards, and opening 1111 is opened, at this point, portion gas enters in diversion cavity 15 through opening 1111, into diversion cavity Gas part in 15 is directly over after long and narrow flow-guiding channel 14 accelerates and is discharged from air outlet 40, and another part passes through first gear First through hole 130 on plate 13 enters the first cavity 170, and the second through-hole 181 being then passed through in third baffle 18 enters the second chamber Body 180 is discharged after recycling from flow-guiding channel 14, realizes the secondary discharge of reflux gas, reduces gas backstreaming, abolished whirlpool Flow problem, to reduce fan noise, improve fan efficiency；And what first baffle, second baffle, third baffle were formed disappears Acoustic resonance structure can inhibit turbulence noise, inhibit broader noise band, preferably offset original noise, and have higher Acoustic absorptivity, it is final to realize under the conditions of big flow that the reduction of noise at volute tongue, vortex are abolished and blower press and efficiency It improves.

Claims (15)

1. a kind of volute structure of centrifugal blower, including volute tongue (1), the volute tongue (1) has volute tongue inner wall (11), and feature exists In the closing of the two sides of: the volute tongue (1) to be formed cavity (10), be provided on the outside of the volute tongue (1) along volute tongue (1) outer wall to The first baffle (13) extended in cavity (10), forms between the top of the first baffle (13) and corresponding volute tongue inner wall (11) Have long and narrow flow-guiding channel (14), encloses diversion cavity between the lower part and cavity (10) inner wall of the first baffle (13) (15), gas supply stream is provided in the position for corresponding to diversion cavity (15) bottom on the volute tongue inner wall (11) to enter in diversion cavity (15) Opening (1111), being additionally provided in the diversion cavity (15) can cover opening (1111) or will be open that (1111) open leading It flows block (100).

2. the volute structure of centrifugal blower according to claim 1, it is characterised in that: be provided with energy on the volute tongue (1) The adjusting component (16) whether baffle (100) are opened and closed relative to opening (1111) is adjusted according to air force.

3. the volute structure of centrifugal blower according to claim 2, it is characterised in that: the adjusting component (16) includes Linking arm (161), pin shaft (162) and elastic component (163), the linking arm (161) are set to the first end of baffle (100) and lead to It crosses pin shaft (162) to be connected to being able to rotate on volute tongue side wall, the baffle (100) is set to above opening (1111) with being able to rotate And (1111) opening that will be open can be floated upwards under distinguished and admirable impact, the second end of the baffle (100) be rotation certainly By holding, the elastic component (163) makes baffle (100) remain the trend for covering opening (1111).

4. the volute structure of centrifugal blower according to claim 3, it is characterised in that: the elastic component (163) is bullet Spring, the first end of the spring and the upper surface of linking arm (161) offset, the second end of the spring and the volute tongue inner wall phase above it It supports.

5. the volute structure of centrifugal blower according to claim 4, it is characterised in that: above the elastic component (163) The plane (114) that uprighting spring is axially arranged, the second end of the spring and plane (114) phase are formed on volute tongue inner wall It supports；The upper surface of the linking arm (161) is offered for spring first end holding card slot therein (1611).

6. the volute structure of centrifugal blower according to claim 1, it is characterised in that: set on the outside of the first baffle (13) Second baffle (17) are equipped with, the second baffle (17) and volute tongue side wall, first baffle (13) enclose closed first chamber jointly Body (170) is provided with the first through hole entered in the first cavity (170) for air-flow self-conductance stream chamber (15) on the first baffle (13) (130)。

7. the volute structure of centrifugal blower according to claim 6, it is characterised in that: the thickness of the first baffle (13) For 1.5~2mm, the diameter of the first through hole (130) is 1~1.8mm.

8. the volute structure of centrifugal blower according to claim 6, it is characterised in that: set in first cavity (170) It is equipped with and is parallel to the third baffle (18) that second baffle (17) are arranged, in the third baffle (18) and second baffle (17), volute tongue Wall encloses the second cavity (180) jointly, is provided on the third baffle (18) and enters second from the first cavity (170) for air-flow The second through-hole (181) of cavity (180).

9. the volute structure of centrifugal blower according to claim 8, it is characterised in that: the thickness of the third baffle (18) Degree is 0.75~1mm, and the diameter of second through-hole (181) is 0.5~0.75mm.

10. the volute structure of centrifugal blower according to claim 1, it is characterised in that: the spiral case knot of the centrifugal blower Structure further includes spiral case ring wall (4), and the volute tongue (1) is connected in the first end of spiral case ring wall (4), volute tongue inner wall (11) packet Include the first side plate bending (111), the second side plate bending (112) and the first planar section (113), first side plate bending (111) close to from The impeller arrangement of heart blower and the first guide face of lower surface composition centrifugal blower, first planar section (113) are set to spiral case Air outlet (40) side and inner surface constitute the second guide face of centrifugal blower, second side plate bending (112) is connected to first Between side plate bending (111) and the first planar section (113).

11. the volute structure of centrifugal blower according to claim 10, it is characterised in that: the spiral case knot of the centrifugal blower Structure further includes front shroud (2), back shroud (3), and the spiral case ring wall (4) is connected between front shroud (2) and back shroud (3), institute It states volute tongue (1) top edge to be connected with front shroud (2), back shroud (3) top edge, volute tongue (1) lower edge and spiral case ring wall (4) the first end margin is connected and passes through silica gel sealing.

12. the volute structure of centrifugal blower according to claim 10, it is characterised in that: the first baffle (13) includes Second planar section (131) and third side plate bending (132), second planar section (131) close first planar section (113) arrangement, The upper end of the third side plate bending (132) is mutually connected with the lower end of the second planar section (131), the third side plate bending (132) to Second side plate bending (112) direction is arched upward and lower end is mutually connected with the upper surface of the first side plate bending (111).

13. the volute structure of centrifugal blower according to claim 12, it is characterised in that: first planar section (113) The width of the flow-guiding channel (14) formed between the second planar section (131) is gradually reduced from bottom to top.

14. the volute structure of centrifugal blower according to claim 1, it is characterised in that: the following table of the baffle (100) Face is configured to the first cambered surface (101) to arch upward downwards, corresponding, and described opening (1111) two sidewalls are formed to and the first cambered surface (101) mating surface (1112) to match.

15. the volute structure of centrifugal blower according to claim 14, it is characterised in that: the baffle (100) it is upper Surface is formed with the second cambered surface (102) to arch upward upwards, and the radian of second cambered surface (102) is greater than the arc of the first cambered surface (101) Degree, and the junction rounding off of first cambered surface (101) and the second cambered surface (102).