CN216044605U - Centrifugal impeller, compressor and air conditioner - Google Patents

Abstract

The utility model provides a centrifugal impeller, a compressor and an air conditioner, wherein the centrifugal impeller comprises: the impeller comprises a hub, a wheel cover and blades, wherein an airflow flowing cavity is defined between the hub and the wheel cover, the blades are contained in the airflow flowing cavity, a communicating channel is formed in the wheel cover and/or the hub, and the airflow flowing cavity can be communicated with the outside of the centrifugal impeller through the communicating channel so as to guide the airflow outside the centrifugal impeller into the airflow flowing cavity and accelerate the airflow in the airflow flowing cavity. According to the utility model, high momentum fluid can be sprayed to the low-speed cluster area in the flow channel through the nozzle, so that the separation of the boundary layer is weakened, the operation efficiency of the machine is improved, and the efficiency of the impeller in operation under high Mach number is ensured.

Description

Centrifugal impeller, compressor and air conditioner

Technical Field

The utility model relates to the technical field of compressors, in particular to a centrifugal impeller, a compressor and an air conditioner.

Background

The centrifugal compressor is widely applied to the fields of refrigeration, aerospace, metallurgy, power and the like. The impeller is used as the heart of the compressor, mainly uses the centrifugal force to do work, and converts the mechanical energy into the pressure energy and the kinetic energy of the gas. When the rotating speed is increased, the Mach number of the airflow in the impeller is also increased, subsonic and even transonic flow is generated, and shock waves are formed. The shock wave not only generates great shock wave loss, but also accelerates the separation of the boundary layer to increase the separation loss, which seriously affects the efficiency of the compressor. Therefore, the control of the shock waves and the related loss thereof have important significance for improving the operation efficiency of the machine.

For the problem of separation loss, the method is mainly optimized by boundary layer suction, blade profile optimization, blade top air injection and the like. Boundary layer suction can well improve the flowing state of low-energy cluster fluid and forcibly weaken separation, but an additional device needs to be introduced, so that the design difficulty is challenged; the optimized blade profile is usually effective only under certain working conditions and cannot completely improve separation; tip injection is a suitable method, but consideration is given to how the air is entrained.

Because the Mach number of the air flow in the impeller is increased when the rotating speed of the centrifugal compressor in the prior art is increased, subsonic or even transonic flow is generated to form shock waves, the shock waves not only can generate great shock wave loss, but also can aggravate the separation of the boundary layer to increase the separation loss, and the technical problems of seriously influencing the efficiency of the compressor and the like are solved, and therefore the centrifugal impeller, the compressor and the air conditioner are researched and designed.

SUMMERY OF THE UTILITY MODEL

Therefore, the technical problem to be solved by the present invention is to overcome the defect of the centrifugal compressor in the prior art that the efficiency of the compressor is seriously affected due to the increased separation loss caused by the separation of the boundary layer, so as to provide a centrifugal impeller, a compressor and an air conditioner.

In order to solve the above problems, the present invention provides a centrifugal impeller including:

the impeller comprises a hub, a wheel cover and blades, wherein an airflow flowing cavity is defined between the hub and the wheel cover, the blades are contained in the airflow flowing cavity, a communicating channel is formed in the wheel cover and/or the hub, and the airflow flowing cavity can be communicated with the outside of the centrifugal impeller through the communicating channel so as to guide the airflow outside the centrifugal impeller into the airflow flowing cavity and accelerate the airflow in the airflow flowing cavity.

In some embodiments, the communication channel is disposed on a wheel cover, the wheel cover including opposing first and second portions forming a first gap therebetween, the communication channel including the first gap.

In some embodiments, a first protrusion is provided on the first portion on a side opposite to the second portion, the first protrusion extending in a direction toward the second portion and forming a second gap with the second portion,

a second protruding part is further arranged on the first part and on the side opposite to the second part, the second protruding part extends towards the second part and forms a third gap with the second part,

the first protrusion is located on the exterior of the wheel cover, and the second protrusion is located on the interior of the wheel cover and in the airflow flow chamber.

In some embodiments, the communication passage includes the second gap and the third gap, one end of the first gap communicates with the second gap, and the other end of the first gap communicates with the third gap, and the air flow passes through the second gap, the first gap, and the third gap in this order while flowing from the outside of the centrifugal impeller to the air flow chamber through the communication passage.

In some embodiments, the second protrusion and the second portion are formed as a nozzle, a flow area of the third gap gradually decreases along a flow direction of the air flow, and an outlet end of the third gap is formed as a nozzle hole of the nozzle.

In some embodiments, the blade has a pressure side region and a suction side region, the total energy of the airflow at the pressure side region being greater than the total energy of the airflow at the suction side region, the total energy of the airflow including the pressure energy and velocity energy of the airflow, the nozzle being aligned with the suction side region of the blade.

In some embodiments, the minimum curve distance between the position where the nozzle hole sprays on the vane and the trailing edge of the vane is L1, the minimum curve length between the head of the vane and the trailing edge is L2, and L1/L2 is 10% to 15%, wherein the trailing edge of the vane is the end located most downstream of the flow of the air flow of the vane, and the head of the vane is the end located most upstream of the flow of the air flow of the vane.

In some embodiments, the diameter of the nozzle hole is 2mm, and the nozzle hole is disposed close to the hub with respect to the wheel cover.

In some embodiments, the first projection is formed as a structure of a baffle: the thickness of the baffle plate in the axial direction of the centrifugal impeller is not less than 3 mm; and/or the baffle plate is of a concave structure or a straight plate structure.

In some embodiments, the second projection is welded to the wheel cover; and/or, the second bulge is in fillet transition with the inner surface of the wheel cover; and/or the presence of a gas in the gas,

in passing through simultaneously in axial direction and radial direction's the cross-section, the second bulge is square structure, just square structure's width is 7 ~ 9 mm.

In some embodiments, the first gap is a through hole, the first gap is plural, and the plural first gaps are spaced apart in a circumferential direction of the wheel cover; and/or the centrifugal impeller comprises an impeller outlet, the first gap being arranged close to the impeller outlet with respect to a central axis of the centrifugal impeller.

In some embodiments, when the first gap is a through hole, the diameter of the through hole is 3-5 mm, and the through hole and the surface of the wheel cover are in round transition.

The utility model also provides a compressor comprising a centrifugal impeller as described in any one of the preceding claims.

In some embodiments, when the centrifugal impeller comprises an impeller outlet,

the compressor further comprises a static part, at least part of the impeller outlet is shielded by the static part, a preset distance is reserved between the static part and the wheel cover to form a circulation channel, airflow at the impeller outlet enters the circulation channel after being blocked by the static part, and the circulation channel is communicated with the communication channel so as to lead the airflow in the circulation channel into the airflow flowing cavity through the communication channel.

In some embodiments, the stationary member is a seal member, and a seal cavity is formed between the seal member and the wheel cover, and the seal cavity is the flow channel; and/or the presence of a gas in the gas,

in the radial direction of the centrifugal impeller, the radial distance between the outlet of the impeller and the stationary part is 2.5-3.5 mm.

The utility model also provides an air conditioner, which comprises the compressor.

In some embodiments, the gas flow chamber further comprises a gas supply port capable of communicating with the communication channel to introduce the gas flow in the gas supply port into the gas flow chamber through the communication channel.

The centrifugal impeller, the compressor and the air conditioner provided by the utility model have the following beneficial effects:

according to the utility model, the communicating channel is formed on the wheel cover and/or the wheel hub, high-energy airflow outside the centrifugal impeller is introduced into the airflow flowing cavity inside the centrifugal impeller through the communicating channel to accelerate the airflow in the airflow flowing cavity, so that a nozzle is formed on the impeller, high-momentum fluid can be sprayed to a low-speed mass area in the flow channel through the nozzle to weaken the separation of boundary layers, the operation efficiency of a machine is improved, the efficiency of the impeller in operation under a high Mach number is ensured, and preferably, leakage gas introduced into the comb tooth seal at the side of the wheel cover or high-energy gas introduced into the air supplementing port can be used. The utility model does not need to add an external air injection device, has simple structure and easy realization, and can reduce leakage loss and further improve energy efficiency because the injection airflow is introduced by shunting of the leakage gas particularly when the leakage gas in the comb tooth seal at the wheel cover side is introduced.

Drawings

FIG. 1 is a schematic representation of the flow structure of a meridian plane of a centrifugal impeller of the present invention;

FIG. 2 is an enlarged partial view of the nozzle portion of FIG. 1;

FIG. 3 is a schematic view of the airflow flow configuration over the blade of FIG. 1;

fig. 4 is a front view of the impeller outlet of fig. 1.

The reference numerals are represented as:

1. a wheel cover; 11. a first part; 12. a second section; 2. a stationary member; 3. an impeller outlet; 4. a blade; 41. a pressure surface area; 42. a suction side region; 43. a trailing edge; 44. a head portion; 5. a nozzle; 6. a hub; 7. a first projecting portion; 8. a second projection; 100. an airflow flow chamber; 101. a first gap; 102. a second gap; 103. a third gap; 10. a communication channel; 200. a flow-through channel; 300. a low velocity bolus region.

Detailed Description

As shown in fig. 1 to 4, the present invention provides a centrifugal impeller comprising:

the impeller comprises a hub 6, a wheel cover 1 and blades 4, an airflow flowing cavity 100 is defined between the hub 6 and the wheel cover 1, the blades 4 are contained in the airflow flowing cavity 100, a communicating channel 10 is formed in the wheel cover 1 and/or the hub 6, and the communicating channel 10 can communicate the airflow flowing cavity 100 with the outside of the centrifugal impeller so as to guide the outside airflow of the centrifugal impeller into the airflow flowing cavity 100 and accelerate the airflow in the airflow flowing cavity 100.

According to the utility model, the communicating channel is arranged on the wheel cover and/or the wheel hub, high-energy airflow outside the centrifugal impeller is introduced into the airflow flowing cavity inside the centrifugal impeller through the communicating channel to accelerate the airflow in the airflow flowing cavity, so that a nozzle is formed on the impeller, high-momentum fluid can be sprayed to a low-velocity cluster area in the flow channel through the nozzle to weaken the separation of boundary layers (namely reduce the separation of boundary layers), the airflow flowing loss is reduced, the operation efficiency of a machine is improved, the efficiency of the impeller in operation under a high Mach number is ensured, and preferably, leakage gas in comb tooth sealing at the side of the wheel cover or high-energy gas in an air supplementing port can be introduced. The utility model does not need to add an external air injection device, has simple structure and easy realization, and can reduce leakage loss and further improve energy efficiency because the injection airflow is introduced by shunting of the leakage gas particularly when the leakage gas in the comb tooth seal at the wheel cover side is introduced.

The utility model provides an impeller internally provided with a nozzle, which is used for weakening the separation of boundary layers and improving the operation efficiency of a machine by introducing leakage gas in a comb tooth seal on the side of a wheel cover and then spraying high-momentum fluid to a low-speed cluster area 300 in a flow channel through the nozzle. This utility model discloses need not add outside air jet system, simple structure easily realizes, and sprays the air current and introduce by leaking the gas reposition of redundant personnel, can also reduce the leakage loss, further improves the efficiency.

The low velocity bolus region refers to a macroscopic region formed by a plurality of fluid micro-boluses with low kinetic energy.

The boundary layer is mainly due to the viscous action of the wall surface on the fluid, so that the kinetic energy of the fluid is almost reduced to 0, and the partial area is the boundary layer. When the impeller runs under high Mach number, the boundary layer is easy to separate, so that the low-speed area of the whole flow channel is increased, the circulation capacity is greatly reduced, and the reason for limiting the development of the impeller towards the high Mach number is also one of the reasons. And the high-speed fluid can drive the low-speed group to move by exchanging momentum with the boundary layer, thereby weakening the separation of the boundary layer and improving the circulation capacity of the flow channel.

The boundary layer is referred to as a boundary layer. Efficiency can be improved without increasing mach number because flow separation occurring at high mach numbers greatly affects efficiency, and if the separation problem is solved, efficiency can be improved.

In some embodiments, the communication channel 10 is disposed on a wheel cover 1, the wheel cover 1 includes a first portion 11 and a second portion 12 opposite to each other, a first gap 101 is formed between the first portion 11 and the second portion 12, and the communication channel 10 includes the first gap 101. The preferred structure of the communicating channel and the preferred structure of the shroud of the present invention are that the shroud portion is cut to form the first portion and the second portion, and at least a part of the communicating channel can be formed in the first gap between the first portion and the second portion, so that the high-energy airflow introduced to the outside of the centrifugal impeller through the first gap enters the inside of the centrifugal impeller, and the low-speed airflow inside the centrifugal impeller is accelerated to reduce the separation of the boundary layer, reduce the airflow loss, and improve the airflow efficiency of the impeller.

In some embodiments, a first protrusion 7 is disposed on the first portion 11 and on a side opposite to the second portion 12, the first protrusion 7 extends toward the second portion 12 and forms a second gap 102 with the second portion 12,

a second protruding part 8 is further arranged on the first part 11 and on the side opposite to the second part 12, the second protruding part 8 extends towards the second part 12 and forms a third gap 103 with the second part 12,

the first projection 7 is located outside the wheel cover 1, and the second projection 8 is located inside the wheel cover 1 and in the airflow flowing chamber 100.

I.e. the first projection 7 is remote from the airflow chamber 100 relative to the second projection 8, which is close to the airflow chamber relative to the first projection.

According to the centrifugal impeller, the first protruding part is arranged on the first part, the first protruding part protrudes and extends towards the second protruding part, and a second gap is formed between the first protruding part and the second protruding part; and through the second bulge part which is arranged on the first part and is bulged towards the second part, a third gap is formed between the second bulge part and the second part, and the third gap is communicated with the first gap, the airflow in the first gap can be introduced into the airflow flowing cavity inside the impeller, so that a low-velocity-group area inside the impeller is completed, the separation of a boundary layer of the area is weakened, the flowing loss is reduced, and the operating efficiency of the impeller is improved.

In some embodiments, the communication channel 10 includes the second gap 102 and the third gap 103, one end of the first gap 101 communicates with the second gap 102, and the other end of the first gap 101 communicates with the third gap 103, and the air flow passes through the second gap 102, the first gap 101, and the third gap 103 in order during the process of flowing from the outside of the centrifugal impeller to the air flow chamber 100 through the communication channel 10. The second gap of the present disclosure is used for introducing high-speed or high-pressure air flow from the outside, the first gap is used for drainage, and the third gap is used for introducing the introduced high-speed and/or high-pressure air flow into the air flow cavity, so that the separation of the boundary layer of the low-speed area is effectively reduced.

The impeller is provided with n small holes (first gaps) uniformly in the circumferential direction of the impeller cover side, and the number n of the small holes is the same as the number of the flow channels and the number of the blades. The small hole is slightly deviated to the outlet of the impeller in the middle of the impeller cover, and the aperture is 3-5 mm. And the small hole and the wheel cover surface need to be transited by a fillet. A circle of baffle plate is added on the outer surface of the wheel cover, and a cavity formed by the baffle plate and the wheel cover is used for drainage. The baffle plate is welded on the outer surface of the wheel cover and is in round angle transition. The thickness of the baffle plate is not less than 3mm at the lowest, and the distance between the highest point of the baffle plate and the static member is not less than 2 mm. The baffle plate can adopt a concave type or a straight plate structure. The nozzle assembly mainly comprises a base and a spray hole with gradually contracted inner diameter, corresponds to the small hole on the wheel cover and is welded on the inner surface of the wheel cover. The nozzle assembly should be sufficiently smooth to transition with a large fillet (reducing flow losses) with the inner surface of the shroud. For convenience of processing, the nozzle assembly can be made into a square shape in the width direction; the nozzle assembly can be modeled according to the blades, so that the nozzle assembly has the function similar to a splitter blade, and the disturbance to the airflow inside the impeller is reduced. The width of the nozzle assembly is 7-9 mm (it cannot be too wide to prevent reducing the flow area, affecting the flow channel, it cannot be too narrow to prevent the nozzle from being effectively arranged). The diameter of the spray hole is 2mm (the spray hole cannot be too small to prevent airflow blockage and cannot be too large to prevent good spraying effect), the spray hole is directed to face 10% -15% of the tail edge of the outlet of the suction surface of the blade, and the spray hole is slightly inclined towards the hub side.

In some embodiments, the second protruding portion 8 and the second portion 12 are formed as a nozzle 5, the flow area of the third gap 103 gradually decreases along the flow direction of the airflow, and the outlet end of the third gap 103 is formed as a spray hole of the nozzle 5. The nozzle is formed by the second protruding part and the second part together, the flow area of the third gap is gradually reduced, the airflow can be continuously accelerated when flowing through the third gap, and the flow velocity of the airflow is larger when the airflow is sprayed into the airflow flowing cavity, so that the airflow in a low-velocity area inside the impeller is effectively accelerated, the separation of a boundary layer is reduced, and the flow loss is reduced.

In some embodiments, the blade 4 has a pressure surface area 41 and a suction surface area 42, the total energy of the airflow at the pressure surface area 41 is greater than the total energy of the airflow at the suction surface area 42, the total energy of the airflow includes the pressure energy and the velocity energy of the airflow, and the nozzle orifice is aligned with the suction surface area of the blade 4. This is the preferred position of the injection position inside the impeller of this disclosure, namely the nozzle hole is just opposite to the suction surface area, and since the sum of the pressure energy and the velocity energy at the suction surface is less than the total energy at the pressure surface area, the injection process can effectively increase the flow velocity of the air flow in the suction surface area, effectively reduce the boundary layer separation in the area, reduce the flow loss, and improve the operating efficiency of the impeller.

The utility model mainly utilizes the high-momentum fluid sprayed by the nozzle to weaken the separation loss of a low-energy fluid area. As shown in fig. 1 and 3, the refrigerant enters the impeller through the suction port, the main flow of fluid flows out radially and enters the diffuser, and at the same time, a part of the air flow leaks into the comb seal cavity because of the gap between the impeller and the stationary member 2 (comb seal). Part of the leaked gas is guided to the nozzle assembly by the baffle plate and then is accelerated to flow out through the nozzle, and the leaked gas is mixed with a low-energy fluid area generated at the tail edge of the suction surface to inhibit separation.

In some embodiments, on the surface of the vane 4, the minimum curved distance from the position where the nozzle hole sprays on the vane 4 to the trailing edge 43 of the vane 4 is L1, the minimum curved length between the head 44 of the vane 4 and the trailing edge 43 is L2, and L1/L2 is 10% to 15%, where the trailing edge 43 of the vane is the end located most downstream of the flow of the air flow of the vane, and the head 44 of the vane is the end located most upstream of the flow of the air flow of the vane. According to the utility model, the injection position is located at a position close to the trailing edge of the blade through the setting of the numerical range, and the position close to the trailing edge and the suction surface is a position where the boundary layer is easy to separate, so that the flow loss is large at the position, and therefore, the reduction degree of the flow loss can be enhanced by aligning the spray hole at the position.

In some embodiments, the diameter of the orifice is 1 to 3mm, preferably 2 mm; the nozzle holes are provided close to the hub 6 with respect to the shroud 1. The nozzle hole of the present invention is also preferably arranged close to the hub, which can enhance the weakening length of the boundary layer because the boundary layer separation is easy to occur in the air flow close to the hub. The diameter of the spray hole cannot be too small to prevent the air flow from being blocked and too large to produce a good spray effect.

In some embodiments, the first projection 7 is formed as a structure of baffles: the thickness of the baffle plate in the axial direction of the centrifugal impeller is not less than 3 mm; and/or the baffle plate is of a concave structure or a straight plate structure. The baffle plate is in a preferable structure form of the first protruding part, the structure of the baffle plate can face the flow channel and is opposite to the incoming flow direction of the airflow, so that the flow of the high-energy airflow entering the flow channel can be obtained to a greater extent, the thickness of the baffle plate is more than or equal to 3mm, the structural strength of the baffle plate can be enhanced, and the drainage effect is improved; the baffle plate is preferably of an inwards concave structure or a straight plate structure, and can effectively play a role and an effect in drainage.

In some embodiments, the second protruding portion 8 is welded and fixed to the wheel cover 1; and/or the second bulge 8 and the inner surface of the wheel cover 1 are in round transition; and/or the presence of a gas in the gas,

in passing through the cross-section of axial direction and radial direction simultaneously, second bulge 8 is square structure, just square structure's width is 7 ~ 9 mm.

The second bulge is preferably welded and fixed with the wheel cover to realize the fixation of the second bulge, and the fillet transition between the second bulge and the inner surface of the wheel cover can reduce the flow loss; the second protruding part 8 is square structure, and the second protruding part can not be too wide in order to prevent to reduce flow area, influences the runner, can not be too narrow in order to prevent to effectively arrange the nozzle, consequently square structure's width can be 7 ~ 9mm can also avoid effectively arranging the condition emergence of nozzle under the condition that does not reduce flow area.

In some embodiments, the first gap 101 is a through hole, the first gap 101 is plural, and the plural first gaps 101 are spaced apart in the circumferential direction of the wheel cover 1; and/or the centrifugal impeller comprises an impeller outlet 3, the first gap 101 being arranged close to the impeller outlet 3 with respect to the central axis of the centrifugal impeller. The through hole and the plurality of first gaps are arranged at intervals in the circumferential direction, so that the injection area can be increased, and the weakening degree of the flow loss of the impeller is improved; the degree of reduction of the flow loss is increased.

In some embodiments, when the first gap 101 is a through hole, the diameter of the through hole is 3-5 mm, and the through hole and the surface of the wheel cover 1 are in round transition. The aperture of the through hole is 3-5 mm, the introduction of sufficient flow of air current can be realized, the flowing speed cannot be weakened, and the flowing loss can be weakened through fillet transition.

The utility model also provides a compressor, preferably a centrifugal compressor, comprising a centrifugal impeller according to any one of the preceding claims.

The utility model designs an impeller internally provided with a nozzle, and high-momentum fluid is sprayed to a low-speed cluster area in a flow channel by the nozzle through introducing leakage gas in comb tooth sealing at the side of a wheel cover so as to weaken the separation of boundary layers and improve the operation efficiency of a machine. This utility model discloses need not add outside air jet system, simple structure easily realizes, and sprays the air current and introduce by leaking the gas reposition of redundant personnel, can also reduce the leakage loss, further improves the efficiency.

In some embodiments, when the centrifugal impeller comprises an impeller outlet 3,

the compressor further comprises a stationary member 2, at least a part of the impeller outlet 3 is shielded by the stationary member 2, a preset distance is formed between the stationary member 2 and the shroud 1 to form a flow channel 200, the airflow at the impeller outlet 3 enters the flow channel 200 after being blocked by the stationary member 2, and the flow channel 200 is communicated with the communication channel 10 to guide the airflow in the flow channel 200 into the airflow flow chamber 100 through the communication channel 10. This is the preferred form of construction for the main embodiment of the utility model, the centrifugal impeller introduces high energy gas flow into the impeller from the external stationary part for injection, reducing gas flow losses.

In some embodiments, the stationary member 2 is a seal member, and a seal cavity is formed between the seal member and the wheel cover 1, and the seal cavity is the flow channel 200; and/or the presence of a gas in the gas,

in the radial direction of the centrifugal impeller, the radial distance between the impeller outlet 3 and the static part 2 is 2.5-3.5 mm.

This is the preferred form of construction of the stationary member of the present disclosure, namely the seal member, which forms a flow passage with the shroud to introduce the energetic fluid to the impeller interior through the flow passage;

in the utility model, the gas originally leaked into the comb tooth seal can be effectively utilized, so that the radial gap between the impeller outlet and the static part and the comb tooth cavity can be increased to increase the flow guiding amount, and the radial gap between the impeller outlet and the static part is 2.5-3.5 mm. And because some air current is guided to the nozzle, the air quantity leaked to the comb teeth is correspondingly reduced, and the gap between the comb teeth can be properly increased. Therefore, the abrasion of the comb teeth can be reduced, and the operation reliability is improved. As shown in figure 1. The gas flow through the impeller is mostly directed from the impeller outlet to the next part, and the sealing gap formed by the impeller and the comb teeth (stationary part 2) necessarily causes leakage, which is diverted to the nozzle. The direction of flow is shown by the arrows.

The utility model also provides an air conditioner, which comprises the compressor.

In some embodiments, the gas supply device further comprises a gas supply port which can be communicated with the communication channel 10 to introduce the gas flow in the gas supply port into the gas flow chamber 100 through the communication channel 10. The air injection structure can also lead out a path of air flow from the air supply port to the nozzle to inject the low-energy fluid area. The method has the advantages that the air quantity can be increased, and the separation of the weakening boundary layer is more effective.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention. The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (17)

1. A centrifugal impeller characterized by: the method comprises the following steps:

the centrifugal impeller comprises a hub (6), a shroud (1) and blades (4), an airflow flowing cavity (100) is defined between the hub (6) and the shroud (1), the blades (4) are contained in the airflow flowing cavity (100), a communicating channel (10) is formed in the shroud (1) and/or the hub (6), the airflow flowing cavity (100) can be communicated with the outside of the centrifugal impeller through the communicating channel (10), so that the airflow outside the centrifugal impeller can be guided into the airflow flowing cavity (100), and the airflow in the airflow flowing cavity (100) is accelerated.

2. The centrifugal impeller of claim 1, wherein:

the communication channel (10) is arranged on the wheel cover (1), the wheel cover (1) comprises a first portion (11) and a second portion (12) which are opposite to each other, a first gap (101) is formed between the first portion (11) and the second portion (12), and the communication channel (10) comprises the first gap (101).

3. The centrifugal impeller of claim 2, wherein:

a first protruding part (7) is arranged on the first part (11) and on the side opposite to the second part (12), the first protruding part (7) extends towards the second part (12) and forms a second gap (102) with the second part (12),

a second convex part (8) is further arranged on the first part (11) and on the side opposite to the second part (12), the second convex part (8) extends towards the second part (12) and forms a third gap (103) with the second part (12),

the first protrusion (7) is located outside the wheel cover (1), and the second protrusion (8) is located inside the wheel cover (1) and in the airflow flowing cavity (100).

4. The centrifugal impeller of claim 3, wherein:

the communication channel (10) comprises the second gap (102) and the third gap (103), one end of the first gap (101) is communicated with the second gap (102), the other end of the first gap (101) is communicated with the third gap (103), and the air flow passes through the second gap (102), the first gap (101) and the third gap (103) in sequence in the process of flowing from the outside of the centrifugal impeller to the air flow flowing cavity (100) through the communication channel (10).

5. The centrifugal impeller of claim 4, wherein:

the second protruding portion (8) and the second portion (12) are formed as a nozzle (5), a flow area of the third gap (103) is gradually reduced along a flow direction of the air flow, and an outlet end of the third gap (103) is formed as a spray hole of the nozzle (5).

6. The centrifugal impeller of claim 5, wherein:

the blade (4) is provided with a pressure surface area (41) and a suction surface area (42), the total energy of the airflow at the pressure surface area (41) is larger than the total energy of the airflow at the suction surface area (42), the total energy of the airflow comprises the pressure energy and the velocity energy of the airflow, and the spray hole is opposite to the position of the suction surface area on the blade (4).

7. The centrifugal impeller of claim 6, wherein:

on the surface of the blade (4), the minimum curve distance between the position sprayed by the spray hole on the blade (4) and the tail edge (43) of the blade (4) is L1, the minimum curve length between the head (44) and the tail edge (43) of the blade (4) is L2, and L1/L2 is 10% -15%, wherein the tail edge (43) of the blade is the end positioned at the most downstream of the airflow flow of the blade, and the head (44) of the blade is the end positioned at the most upstream of the airflow flow of the blade.

8. The centrifugal impeller of claim 5, wherein:

the diameter of the spray hole is 1-3 mm, and the spray hole is close to the hub (6) and is arranged relative to the wheel cover (1).

9. The centrifugal impeller of claim 3, wherein:

the first projection (7) is formed in the structure of a baffle: the thickness of the baffle plate in the axial direction of the centrifugal impeller is not less than 3 mm; and/or the baffle plate is of a concave structure or a straight plate structure.

10. The centrifugal impeller of claim 3, wherein:

the second protruding part (8) and the wheel cover (1) are welded and fixed; and/or the second bulge (8) is in fillet transition with the inner surface of the wheel cover (1); and/or the presence of a gas in the gas,

in the cross-section passing through the axial direction and the radial direction of the centrifugal impeller at the same time, the second protruding part (8) is of a square structure, and the width of the square structure is 7-9 mm.

11. The centrifugal impeller of claim 2, wherein:

the first gaps (101) are through holes, the first gaps (101) are multiple, and the multiple first gaps (101) are arranged at intervals in the circumferential direction of the wheel cover (1); and/or the centrifugal impeller comprises an impeller outlet (3), the first gap (101) being arranged close to the impeller outlet (3) with respect to a centre axis of the centrifugal impeller.

12. The centrifugal impeller of claim 11, wherein:

when the first gap (101) is a through hole, the diameter of the through hole is 3-5 mm, and the through hole and the surface of the wheel cover (1) are in fillet transition.

13. A compressor, characterized by: comprising a centrifugal impeller according to any one of claims 1-12.

14. The compressor of claim 13, wherein:

when the centrifugal impeller comprises an impeller outlet (3),

the compressor further comprises a static part (2), at least part of the impeller outlet (3) is shielded by the static part (2), a preset distance is arranged between the static part (2) and the wheel cover (1) to form a circulation channel (200), airflow of the impeller outlet (3) enters the circulation channel (200) after being blocked by the static part (2), and the circulation channel (200) is communicated with the communication channel (10) so that the airflow in the circulation channel (200) is guided into the airflow flow cavity (100) through the communication channel (10).

15. The compressor of claim 14, wherein:

the static part (2) is a sealing part, a sealing cavity is formed between the sealing part and the wheel cover (1), and the sealing cavity is the circulating channel (200); and/or the presence of a gas in the gas,

in the radial direction of the centrifugal impeller, the radial distance between the impeller outlet (3) and the static part (2) is 2.5-3.5 mm.

16. An air conditioner, characterized in that:

comprising a compressor according to any one of claims 13-15.

17. The air conditioner according to claim 16, wherein:

further comprising an air supply port capable of communicating with the communication passage (10) to introduce the air flow therein into the air flow chamber (100) through the communication passage (10).

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