CN221347336U - Turbine fan adopting novel fan blade shell - Google Patents

Abstract

The utility model provides a turbine fan adopting a novel fan blade shell, which comprises a volute, a fan blade shell, a stator assembly, a rotor assembly, a fan blade and an air outlet, wherein the volute is provided with a first cavity, the fan blade shell is provided with a second cavity, the first cavity and the second cavity are assembled to form a fan runner cavity, an air inlet is formed in the fan blade shell, the air inlet extends inwards to form a groove, and the radius of a round angle of the groove is 0.5-1.0mm. According to the fluid dynamics principle, the air inlet of the fan blade shell is designed into a large round angle, and a clearance cavity between the fan blade shell and the fan blade is further designed into a conical cavity with gradually narrow clearance size from outside to inside and a combined cavity communicated with the conical cavity from bottom to top, so that the technical problem of large pneumatic noise caused by the design of the right-angle air inlet of the turbine fan in the prior art is solved.

Description

Turbine fan adopting novel fan blade shell

Technical Field

The utility model relates to the field of fans, in particular to a turbine fan adopting a novel fan blade shell.

Background

In modern clinical medicine, a respirator is used as an effective means capable of replacing autonomous ventilation by manpower, is widely used for respiratory failure caused by various reasons, anesthesia respiratory management during major surgery, respiratory support treatment and emergency resuscitation, and occupies a very important position in the field of modern medicine. The breathing machine is a vital medical device which can prevent and treat respiratory failure, reduce complications, save and prolong the life of patients. The ventilator is divided into a Controlled Mechanical Ventilation (CMV) and an Assisted Mechanical Ventilation (AMV) according to the use types, power is provided by an internal centrifugal fan, the centrifugal fan mainly comprises a volute, an impeller and a motor, the centrifugal fan generates centrifugal force by high-speed rotation, the turbine fan is a main source of ventilator noise, on one hand, the ventilator noise is emitted by the turbine fan, in addition, when air flows through the ventilator airway, the noise can be transmitted and generated, the noise of the traditional single fan noise exceeds 50dBA under 10cm water column, and for the ventilator used in a hospital, a patient needs a sufficiently quiet environment, so the noise of the fan is extremely obvious, and the rest recovery of the patient is unfavorable.

Disclosure of utility model

In order to overcome the defects and shortcomings of the prior art, the utility model provides a turbine fan adopting a novel fan blade shell, wherein the air inlet of the fan blade shell is designed to be a large round angle according to the fluid dynamics principle, a clearance cavity between the fan blade shell and the fan blade is further designed to be a combined cavity of a conical cavity with gradually narrow clearance size from outside to inside and a conical cavity communicated with the conical cavity from bottom to top, and the technical problem of large pneumatic noise caused by the design of a right-angle air inlet of the turbine fan in the prior art is solved.

The utility model realizes the aim through the following technical scheme: the utility model provides an adopt novel fan blade shell's turbofan, includes spiral case, fan blade shell, stator module, rotor subassembly, fan blade, air outlet, the spiral case has first cavity, the fan blade shell has the second cavity, first cavity with the second cavity equipment forms fan runner chamber, be provided with the air intake on the fan blade shell, the air intake inwards extends and forms the recess, the fillet radius of recess is 0.5-1.0mm.

Preferably, the air inlet part of the fan blade is provided with a protruding part, the protruding part is arranged in the groove, and a clearance cavity between the protruding part and the side surface of the groove is a conical cavity.

Preferably, the clearance cavity is gradually narrowed from outside to inside from a first conical cavity in a horizontal direction and a second conical cavity communicated with the first conical cavity and folded to a vertical direction, and the second conical cavity is gradually narrowed from bottom to top.

Preferably, the dimension of the clearance cavity in the direction perpendicular to the fan blade shell is 0.2mm-0.4mm.

Preferably, the fan blade is disposed in the second cavity.

Preferably, the fan blade is provided with an upper blade surface, a lower blade surface and blades, the sizes of the upper blade surface and the lower blade surface are different, the upper blade surface and the lower blade surface are combined to form a cone, and the blades are arranged in a centrifugal way.

Preferably, the rotor assembly rotates around a shaft, the shaft is matched with a boss arranged on the fan blade and opposite to the protruding portion, and the boss is a cone with gradually increased size from outside to inside.

Preferably, the bearing further comprises a bearing and an end cover, wherein a rubber ring is arranged on the periphery of the bearing, the rubber ring is arranged in a bearing chamber on the end cover, and the rubber ring is in interference fit with the bearing chamber.

Compared with the prior art, the utility model has the beneficial effects that:

The utility model discloses a turbine fan adopting a novel fan blade shell. The fan shell adopts the recess that the air intake inwards extends to form with the bellying cooperation of fan blade air inlet department forms the clearance chamber of two toper cavitys, specifically is from keeping away from the air intake is from outside-in first toper cavity of the horizontal direction of narrowing and with the second toper cavity of the vertical direction of turning over of first toper cavity intercommunication, the second toper cavity is from down to narrowing gradually, the clearance chamber is perpendicular to the fan blade shell ascending size of orientation is 0.2mm-0.4mm, the fan blade produces centrifugal force when high-speed rotation, air intake department pressure reduces, the fluid pressure of the first cavity of spiral case is greater than fan blade air intake department, the cross-section is for the toper clearance chamber is favorable to reducing fluid in the spiral case is through clearance chamber fall to the wind speed and the amount of wind of fan blade air intake department reduces the pneumatic noise of air intake department, improves motor efficiency simultaneously.

The blades of the fan blade adopt coaxial different diameters of upper and lower blade surfaces, the combined fan blade is integrally provided with a top-free cone, the blades of the fan blade are in a centrifugal structure design, fluid is accelerated by the fan blade when flowing through the fan blade, and the fluid forms a tangential fan blade radial and an axial downward synthetic speed at an air outlet of the fan blade; the fluid is prevented from directly striking the inner wall of the volute to generate pneumatic noise, and meanwhile, the velocity component in the axial downward direction is beneficial to the fluid to flow out quickly along the cavity designed by the Archimedes spiral line, so that the fluid noise is further reduced, and the fan efficiency is improved.

The turbine fan adopting the novel fan blade shell also comprises a bearing and an end cover, wherein a rubber ring is arranged on the periphery of the bearing, the rubber ring is arranged in a bearing chamber on the end cover, the rubber ring is in interference fit with the bearing chamber, and the bearing is eliminated with play through pre-pressing, so that the noise of the bearing is reduced; the rubber ring is made of elastic materials, plays a damping role when the motor works at a high speed, reduces vibration on the rotor assembly, greatly reduces noise caused by vibration of the motor, and meanwhile, the bearing and the rubber ring have the effect of sealing the motor, abnormal gas in the motor can be isolated from flowing into air when the motor is abnormal, air pollution is caused to a respiratory system, and the running noise of the whole machine is further reduced.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.

FIG. 1 shows a schematic diagram of a turbo fan employing a novel fan blade case according to the present utility model.

FIG. 2 shows a second schematic view of a turbofan employing a novel fan blade case according to the present utility model.

FIG. 3 shows a schematic view of a fan blade housing and fan blade assembly of a turbofan employing a novel fan blade housing according to the present utility model.

Fig. 4 shows a first cavity diagram of a volute of a turbofan employing a novel fan blade shell.

FIG. 5 shows a cross-sectional view of a fan blade of a turbofan employing a novel fan blade shell in accordance with the present utility model.

Reference numerals: 1-a volute; 11-a first cavity; 2-fan blade shells; 21-a second cavity; 22-an air inlet; 221-grooves; 3-stator assembly; 4-a rotor assembly; 5-fan blades; 51-a boss; 52-upper leaf surface; 53-lower leaf surface; 54-leaf; 55-boss; 6-an air outlet; 7-a clearance cavity; 71-a first conical cavity; 72-a second conical cavity; 8-bearing; 9-end caps; 10-rubber rings.

Detailed Description

The present utility model will be further described with reference to the drawings and detailed description, wherein the described embodiments are only some, but not all, of the embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1 to 5, a medical ventilator includes a low-noise high-speed turbine fan disclosed by the utility model, and the low-noise high-speed turbine fan includes a volute 1, a fan blade shell 2, a stator assembly 3, a rotor assembly 4, a fan blade 5, an air outlet 6, a bearing 8 and an end cover 9.

The spiral case 1 is provided with a first cavity 11, the fan blade shell 2 is provided with a second cavity 21, the first cavity 11 and the second cavity 21 are assembled to form a fan runner cavity, the first cavity 11 is provided with a spiral expansion structure, the first cavity 11 is gradually increased from inside to outside in size, the first cavity 11 is provided with an initial spiral line, the first cavity 11 is designed by adopting an Archimedes spiral line, the air outlet 6 is positioned on the tangential direction of the side face of the spiral case 1, and the highest point of the air outlet 6 is lower than the position of the initial spiral line.

The fan blade 5 is arranged in the second cavity 21, the fan blade shell 2 is also provided with an air inlet 22, the air inlet 22 extends inwards to form a groove 221, the round corner radius of the groove is 0.5mm or 1.0mm, the air inlet of the fan blade 5 is provided with a protruding part 51, the protruding part 51 is arranged in the groove 221, a clearance cavity 7 between the protruding part 51 and the side surface of the groove 221 is a conical cavity, the clearance cavity 7 is gradually narrowed from outside to inside from a first conical cavity 71 in the horizontal direction far away from the air inlet 22 and a second conical cavity 72 which is communicated with the first conical cavity 71 and is folded to the vertical direction, the second conical cavity 72 is gradually narrowed from bottom to top, the size range of the clearance cavity 7 in the direction perpendicular to the fan blade shell 2 is 0.2mm-0.4mm, the fan blade 5 is provided with an upper blade surface 52, a lower blade surface 53 and a blade 54, the upper blade surface 52 and the lower blade surface 53 are different in size, the upper blade surface 52 and the lower blade surface 53 are combined to form a cone, the blade 54 is in centrifugal arrangement, the fan blade 5 generates centrifugal force when rotating at a high speed, the pressure at an air inlet is reduced, the fluid pressure of the first cavity 11 of the volute 1 is greater than that at the air inlet of the fan blade, and the clearance cavity 7 with a conical section is beneficial to reducing the wind speed and the wind quantity of the fluid in the volute 1 flowing into the air inlet of the fan blade 5 through the clearance cavity 7.

Further, the end cover 9 and the opposite side surface of the first cavity 11 of the volute 1 enclose to form a power cavity, the stator assembly 3 and the rotor assembly 4 are arranged in the power cavity, a plurality of cooling fins are arranged on the opposite side surface of the first cavity 11 of the volute 1 and the stator assembly 3, and the staggered arrangement of the cooling fins and the impeller of the fan form a labyrinth space for reducing air mixed flow between the fan blade 5 and the volute 1.

Further, the rotor assembly 4 rotates around a shaft, the shaft is matched with a boss 55 on one side of the fan blade 5, and the boss 55 is a cone with gradually increased size from outside to inside.

Further, the periphery of the bearing 8 is provided with a rubber ring 10, the rubber ring 10 is arranged in a bearing chamber on the end cover 9, the rubber ring is in interference fit with the bearing chamber, the rubber ring 10 is made of elastic materials, and plays a damping role when the motor works at a high speed, vibration on the rotor assembly is reduced, noise caused by vibration of the motor is greatly reduced, meanwhile, the bearing and the rubber ring have the function of sealing the motor, abnormal gas in the motor can be isolated from flowing into air when the motor is abnormal, air pollution is caused to a respiratory system, and running noise of the whole motor is further reduced.

The foregoing list is only illustrative of specific embodiments of the utility model. It is obvious that the utility model is not limited to the above embodiments, but that many similar modifications are possible, all modifications which can be directly derived or suggested to a person skilled in the art from the disclosure of the utility model are to be considered as the scope of the utility model as claimed.

Claims (8)

1. The utility model provides an adopt turbo fan of novel fan blade shell, its characterized in that, including spiral case (1), fan blade shell (2), stator module (3), rotor subassembly (4), fan blade (5), air outlet (6), spiral case (1) have first cavity (11), fan blade shell (2) have second cavity (21), first cavity (11) with second cavity (21) equipment forms fan runner chamber, be provided with air intake (22) on fan blade shell (2), air intake (22) inwards extend and form recess (221), the fillet radius of recess (221) is 0.5-1.0mm.

2. The turbine fan adopting the novel fan blade shell as claimed in claim 1, wherein the air inlet part of the fan blade (5) is provided with a protruding part (51), the protruding part (51) is arranged in the groove (221), and a clearance cavity (7) between the protruding part (51) and the side surface of the groove (221) is a conical cavity.

3. The turbine fan adopting the novel fan blade shell as claimed in claim 2, wherein the clearance cavity (7) is gradually narrowed from outside to inside from a first conical cavity (71) in a horizontal direction and a second conical cavity (72) communicated with the first conical cavity (71) and folded to a vertical direction, and the second conical cavity (72) is gradually narrowed from bottom to top.

4. Turbine fan with new blade shells according to claim 2, characterized in that the size of the clearance cavity (7) in the direction perpendicular to the blade shell (2) is 0.2mm-0.4mm.

5. Turbine fan with a new blade shell according to claim 1, characterized in that the blade (5) is arranged in the second cavity (21).

6. The turbofan employing the novel fan blade shell according to claim 1, wherein the fan blade (5) has an upper blade face (52), a lower blade face (53) and a blade (54), the upper blade face (52) and the lower blade face (53) are different in size, the upper blade face (52) and the lower blade face (53) are combined to form a cone, and the blade (54) is arranged in a centrifugal manner.

7. The turbofan with new blade shell according to claim 2, characterized in that the rotor assembly (4) rotates around a shaft, the shaft cooperates with a boss (55) provided on the blade (5) opposite the boss (51), the boss (55) being a cone of increasing size from the outside to the inside.

8. The turbine fan adopting the novel fan blade shell as claimed in claim 1, further comprising a bearing (8) and an end cover (9), wherein a rubber ring (10) is arranged on the periphery of the bearing (8), the rubber ring (10) is arranged in a bearing chamber on the end cover (9), and the rubber ring is in interference fit with the bearing chamber.