CN207155588U - Impeller head - Google Patents

Abstract

The utility model discloses a kind of impeller head, including housing, and the shot wheel that the pill casting wheel and pill casting wheel being contained in housing coaxially assemble, also include being assemblied on housing from one end, and the feed arrangement of bullet is provided to shot wheel, one end of the shot wheel is the seat for being assembled between pill casting wheel, and the other end is the end ring body for accepting feed arrangement, and annular array has the cylinder for determining to divide ball hole between seat and end ring body；The cylinder at least centrifuges side and peripheral side is powdered metallurgical material body.It is relatively long according to the utility model service life, and cost compare it is relatively low.

Description

Impeller head

Technical field

It the utility model is related to a kind of impeller head.

Background technology

Ball blast technology is by the bullet from entering pills apparatus, by the preliminary acceleration of shot wheel, by being enclosed on outside shot wheel Orienting cover is dished out, and is then accepted by blade, continues to accelerate by centrifugal force along blade surface, and fly out impeller head, so as to realize pair The impeller blasting and reinforcing of various component surfaces.

Because impeller blasting is not limited by part size, shape and weight is cleaned, and can improve engineering goods and The anti-fatigue performance of hardware, stress concentration is eliminated, stress concentration eliminates the need for bigger mechanical shock, therefore, Ask the speed for the bullet for impacting piece surface very fast.In addition, bullet should be ideally spherical in itself, but actual system Make bullet out and be difficult to preferable spherical structure.And in order to cost-effective, bullet will generally recycle, new bullet Ball will be mixed into a certain amount of bullet being recovered to.Generally, the bullet being recycled makes its circle because generating mechanical impact Degree becomes worse, and the bullet that the recovery of significant proportion obtains can have pit or breakage in itself, and these bullets can be to throwing Ball device produces bigger abrasion.

The part for being easy to be worn in impeller head is mainly shot wheel and blade, comparatively, because bullet is in blade table Faster, therefore, the emphasis of present impeller head failure research also mainly falls on blade the speed in face, and to the less pass of shot wheel Note.

Shot wheel failure is shown on regional imbalance, for determining to divide the cylinder of ball mouth can be by the direct impact of bullet And friction, it is easy to fail, and remaining position of shot wheel is then not easy to fail.Short -board effect can be thereby produced, if because cylinder loses Imitate and scrap whole shot wheel, then can produce unnecessary waste.

Such as Chinese patent literature CN2885505Y, its some basic parameter to pills dispensing apparatus gives explanation, such as it is said Bright book specific embodiment part points out that the maximum ball blast amount of institute's restriction impeller head can reach 19 ton hours, and bullet is most Terminal velocity can reach 60 meter per seconds, reflect environment used in shot wheel and blade.In addition, it is also indicated that, used bullet In addition to bullet, in addition to corner angle steel sand, and friction is more violent caused by the bullet with corner angle.It is used for solving abrasion The technological means of problem is that the consumable accessory such as shot wheel, blade uses Abrasion Resistant High Chromium Cast Iron cast, to improve part in itself Anti-wear performance, however, as it was previously stated, such as shot wheel, not wearability everywhere has identical requirement, monoblock cast although Can solve the problems, such as region wearability, but the raising of overall wear resistance also implies that the waste of material property.

Equally, such as Chinese patent literature CN202640176U, shot wheel is divided into two parts of mounting seat and cylinder by it, In order to improve anti-wear performance, its cylinder and mounting seat use high manganese cast iron integrated injection molding.In other words, its overall material Matter is still consistent, and there is the waste of material property, and the holistic cost made is higher.

Utility model content

It is relatively long that the purpose of this utility model is to provide a kind of service life, and cost compares relatively low throwing Ball device.

According to embodiment of the present utility model, there is provided a kind of impeller head, including housing, and the ball blast being contained in housing Wheel, the shot wheel coaxially assembled with pill casting wheel, in addition to be assemblied in from one end on housing, and the charging of bullet is provided to shot wheel Device, one end of the shot wheel are the seat for being assembled between pill casting wheel, and the other end is the end ring for accepting feed arrangement Body, annular array has the cylinder for determining to divide ball hole between seat and end ring body；

The cylinder at least centrifuges side and peripheral side is powdered metallurgical material body.

Above-mentioned impeller head, alternatively, the cylinder have：

First structure, generally powdered metallurgical material body；Or

Second structure, cylinder include the cell body with the matrix post and a powdered metallurgical material material of end ring body and seat one；

Corresponding to first structure, in being provided with embedding slot on seat and end ring body, for the present dress with end ring body of cylinder Match somebody with somebody；

Corresponding to the second structure, cell body is buckled on cylinder, and wraps the centripetal side of cell body and circumferential both sides.

Alternatively, corresponding to first structure, embedding slot has the restraining structure of shot wheel axial direction.

Alternatively, the embedding slot is the first dovetail groove or the first T-slot.

Alternatively, pill casting wheel has single-ended seat board, and the single-ended seat board is impeller, and impeller is provided with blade fixing structure；

Correspondingly, blade is fixed on impeller by the blade fixing structure.

Alternatively, blade is the two segment structure from centripetal end to centrifugation end；

Two segment in above-mentioned two segment structure is flat board；

It is connected between two flat boards by the transition arcs tangent with two flat board opposite ends.

Alternatively, the slab length d2 positioned at centrifugal step is more than the slab length d1 positioned at centripetal end.

Alternatively, d2 is 1.2 ~ 1.5 times of d1.

Alternatively, the angle between two flat boards is 165 ~ 175 degree.

Alternatively, blade fixing structure is the second dovetail groove or the second T-slot for being molded over impeller end face, and second The centrifugation end of dovetail groove or the second T-slot is provided with the first pin-and-hole；

Correspondingly, the portions of blade are configured to dovetail configuration or T-type structure, and are accordingly provided with the second pin-and-hole or block seat；

One connecting pin is provided, the centrifugation of blade is constrained to the free degree by the first pin-and-hole and the second pin-and-hole or block seat.

According to embodiment of the present utility model, the shot wheel with long service life is proposed, the shot wheel is neither often The shot wheel of material is advised, nor the shot wheel of overall expensive material, and simply the cylinder of shot wheel is strengthened, cost In the case of relatively low, there is long service life.

Brief description of the drawings

Fig. 1 is that a kind of impeller head master cuts open structural representation in an embodiment.

Fig. 2 is the left view structural representation corresponding to Fig. 1.

Fig. 3 is a kind of shot wheel structural representation.

Fig. 4 is another shot wheel structural representation.

Fig. 5 is a kind of pill casting wheel structural representation.

Fig. 6 is a kind of blade wheel structure schematic diagram.

Fig. 7 is a kind of blade construction schematic diagram.

Fig. 8 is that one kind enters ball apparatus structure schematic diagram.

Fig. 9 is a kind of blade construction Parameter Map.

In figure：1. feed arrangement, 2. shot wheels, 3. pill casting wheels, 4. housings, 5. main shafts, 6. annular pressing plates.

Dished out window 11. hopper, 12., 13. shot wheel accommodating cavities.

21. enter ball mouth, 22. end ring bodies, 23. edge posts, 24. seat boards, 25., 26. matrix posts, 27. inserts.

31. blade, 32. impellers.

311. centrifugation ends, 312. block seats, 313. mounting seats, 314. centripetal ends, 315. first paragraphs, 316. changeover portions, 317. Second segment.

Embodiment

With reference to Figure of description 1, main shaft 5 is the base reference system of impeller head, shot wheel 2, pill casting wheel 3, housing 4, orientation The basic elements of character such as set are required for keeping higher axiality with main shaft 5.Critical piece is at the both ends of the axial direction of main shaft 5 on impeller head, Such as the axial direction of main shaft 5, for determining end face.

The left end cap of housing 4 is provided with bearing block in Fig. 1, and for the introducing of main shaft 5, the right end cap of housing 4 is used to install Feed arrangement 1.

Main shaft 5 is arranged on housing 4 by bearing block, and is insinuated into by bearing saddle bore inside housing 4, and this is insinuated into shell Spindle nose in body 4 is used to install pill casting wheel 3 and shot wheel 2, and the sheath structure in Fig. 8 with ball blast window 12 is orienting cover, point Ball wheel 2 is located in orienting cover, is entered after being dished out by ball blast window 12 in pill casting wheel 3.Comparatively, rubbed in impeller head The maximum part of power is the blade 31 of pill casting wheel 3, and it is shot wheel 2 to take second place, furthermore is orienting cover, in embodiment of the present utility model In, the first purpose is the wear-resisting sex chromosome mosaicism of shot wheel 2.A further object is the assembling structure matters of pill casting wheel 3.

In the construction shown in fig. 1, its housing 4 is similar to the wind drum housing of air blower, is all drum type structure, that is, has master Two end caps of the axial direction of axle 5 and show cylinder or rotary structure substantially of the axis of main shaft 5 for axle greatly, to determine one Generally cylinder or drum type inner chamber broad in the middle small in ends.

One in 4 two end caps of housing can with rotary structure integral casting forming, can also two end caps it is independent Assembled after shaping with the main body of housing 4 being independently molded.

Most of functional part of impeller head is all placed in housing 4, and the part therein driven by main shaft 5 is ball blast Pill casting wheel 3 is arranged on above-mentioned by wheel 3 and shot wheel 2, the spindle nose that main shaft 5 is located in housing 4 by key or other fixed structures On spindle nose, and shot wheel 2 typically directly or is indirectly arranged on main shaft 5.

It is the seat 25 of shot wheel 2 in the right-hand member of the shot wheel 2 shown in Fig. 3, the seat 25 has a socket cap, socket cap The one end side being connected with seat board in figure 24 is provided with key, and the centre bore on the pill casting wheel 3 shown in Fig. 5（Seat shown in Fig. 6 Hole 324）Symmetrically arranged keyway is then provided with, correspondingly, the seat 25 of shot wheel 2 may be mounted on the centre bore of pill casting wheel 3, so Axial restraint afterwards, realize both coaxial assemblings.

In Fig. 1, from the bullet that feed arrangement 1 enters by accelerating projectile to enter in shot wheel 2 caused by deadweight, dividing Ball wheel 2 makes bullet tentatively be accelerated, comparatively, although bullet is in shot wheel 2 by rotation caused by main shaft drives Speed it is relatively slow, but also because speed is slow, and the time being detained in shot wheel 2 is slightly long, the abrasion ratio suffered by it Pill casting wheel 3 is slightly smaller, and is in the second part for being easy to be worn in impeller head.

In general, shot wheel 2 is to be integrally formed, such as by cast steel material integral casting forming, then carry out again follow-up Processing after produce, its manufacture craft is relatively easy, but as described in the background section, due to being limited by material performance itself System, its made are easy to be worn and fail.

In the document cited in background section, although there is also the shot wheel 2 of simple package assembly, it is led Partly to still need global formation, and in order to meet overall shaping, it is desirable to by the material of the various pieces of global formation Just the same, in order to improve overall service life, shot wheel 2 is made by precious alloy on the whole, such as Chinese patent High manganese cast iron global formation is used in document CN202640176U, and Chinese patent literature CN2885505Y is then cast by high chromium Ferroalloy is integrally cast.

Integral casting process is simple, and the service life of shot wheel 2 is also very long, but holistic cost is higher, and its replacing is necessary Integral replacing.

Because the rotating ratio of shot wheel 2 is higher, such as 2460r/min can be reached in some applications, monoblock cast has Its important technical and manufacturability requirement, it is under high-speed rotation, if the various pieces decentraction of shot wheel 2, is easy to produce ratio Larger vibrations, not only noise is big, and easily damages the bearing of main shaft 5.And monoblock cast, then it is easy to ensure that shot wheel 2 is each Individual part is coaxial, and in other words, the probability for producing bias is relatively low.

In addition, structure shown in Figure 3, is analogous to the stator profile of squirrel-cage motor, it has a seat 25, the seat 25 are used for assembling of the shot wheel 2 on impeller 32 or main shaft 5, and have an end ring body 22, and ring part is used as into ball mouth 21, for accepting the bullet cast from feed arrangement 1.

What shot wheel 2 first had to ensure is the axiality between end ring body 22 and seat 25, can accomplish that preferable axiality is best, Preferable axiality is not reached even, it is also desirable to which higher axiality, such as axiality are 0.01mm.

During overall manufacture, seat 25, seat board 24, edge post 23, end ring body 22 shown in Fig. 3 are integrally formed, and are easy to ensure together Axle degree, it is also easy to ensure edge post 23 in the circumferentially distributed uniformity of shot wheel 2 and the uniformity of respective assembling structure.So as to ensure A point ball mouth is determined between edge post 23（Or hole, term name is different, but substantial structure is identical）Uniformity.

In embodiment of the present utility model, edge post 23 or insert 27 in shot wheel 2 directly contact with bullet, and easy In failure, therefore, this two base part is made using the relatively good powdered metallurgical material of anti-wear performance.

Powder metallurgy is with metal dust（Or the mixture of metal dust and non-metal powder）As raw material, by shaping And sintering, the technology of manufacture metal material, composite and all kinds product.Powder metallurgic method has with production ceramics Similar place, sintered powder technique is belonged to, therefore, a series of New Technologies In Powder Metallu Rgies can also be used for the system of ceramic material It is standby.On powder metallurgical technique comparative maturity, will not be repeated here.

Good anti-wear performance, powder metallurgy selection range should be had based on design of the present utility model, such as edge post 23 Compare extensively, and the overwhelming majority has good anti-wear performance.Powdered metallurgical material is further changed in addition, also existing at present Property, so as to improve the material of its performance in a certain respect, such as P/M Sintered Iron-based Material, such as Fe-C-RE and Fe-C-Cu- The powdered metallurgical materials such as P-Mo, are modified by surface, can obtain more preferably wearability.On the other hand, also belong in field of powder metallurgy In the selection of routine, will not be repeated here.

Remember that for the structure division of connection end ring body 22 and seat board 24 be cylinder, the cylinder has part-structure not produced with bullet Raw contact, therefore, the part-structure can use conventional material, such as cast steel, it is necessary to which the position for carrying out wearability reinforcement is post Body at least centrifuges side and peripheral side, and it is powdered metallurgical material body to centrifuge side and peripheral side.Edge post 23 in Fig. 3 is about one four Rib body structure, wherein in addition to centrifuging the side of side, remaining side is powdered metallurgical material.

It is understood that face is only the geometric element without thickness in geometry, and therefore, the side of so-called centrifugation side Face, constructed by cylinder remainder, remainder should at least possess corresponding thickness, and therefore, the side for centrifuging side uses Conventional material is not whole, but partial structurtes.

Fig. 3 shows a kind of column structure, and in figure 3, cylinder is integrally made by powdered metallurgical material, is designated as first Structure.

In first structure, edge post 23 and end ring body 22 and seat 25（Generally note seat board 24 is a part for seat 25, with lower class Together）Between connection be attached using embedding slot, inlay and connected between post 23 and embedding slot using interference, the letter of interference attachment structure It is single, it is not necessary to extra fastener.

It should be noted that it is mainly used to overcome the centrifugal force of edge post 23 for inlaying the structure of the connection of post 23, and bullet is made It can ignore compared to the centrifugal force suffered by edge post 23 for inlaying the power on post 23, and simple centrifugal force can be based on completely Interference fit overcomes, and realizes being reliably connected for edge post 23 and end ring body 22 and seat 25.

Special frock is needed when assembling shot wheel 2, the frock has a socket cap, and end ring body 22 can be enclosed on just On socket cap, with socket cap relatively, there is provided one has the pipe sleeve of keyway, and the pipe sleeve is adapted to connection with seat 25, and top pressure exists The end face of socket cap.Pipe sleeve and socket cap are by support body to ensure axiality.

For the distance between end ring body 22 and seat 25, then need not specially position, can when embedding slot installs edge post 23 Enough determine the position relationship between end ring body 22 and seat 25.

Shot wheel 2 shown in Fig. 3 is used as an assembly, and it maintains the construction of assembly to place one's entire reliance upon and inlays post 23 and embedding slot Between adhesion, the basic exercise form of shot wheel 2 is revolution, relatively low to shearing resistance Capability Requirement, to tension Capability Requirement then more Low, simple can meet detailing requiments by the adhesion between edge post 23 and embedding slot.

In a preferred embodiment, by constructing the edge column cap of special-shaped embedding slot and matching, faying face can be increased Area, make with reference to relatively reliable.

In certain embodiments, embedding slot is configured to dovetail groove or T-slot, bigger than simple rectangular channel contact area, Structural reliability can be improved, and dovetail groove and T-slot have to constraint of the edge post 23 in the axial direction of shot wheel 2.

In certain embodiments, then referring to Figure of description 4, in Fig. 4, end ring body 22, seat board 24 and seat 25 can be with one Body formed, being integrally formed means connector be present between end ring body 22 and seat board 22, and the connector is base as shown in Figure 4 Scapus, the matrix post and end ring body 22, seat board 24 and the global formation of seat 25, such as be manufactured, be easy to ensure end ring body 22 with Preferable axiality is kept between seat 25, and overall structure reliability is far above the structure shown in Fig. 3.

In second structure, matrix post 26 need to reserve setting-in surplus, correspondingly compared to main body, there is provided the insert of groove profile 27, the groove of insert 27 is with matrix post 26 also by interference fit, and in other words, insert 27 passes through the cooperation of groove and matrix post 26 Realize pressing.

Matrix post 26 is integrally formed with end ring body 22, seat board 22, for the assembling for insert 27, pure edge post 23 Assembly technology is simple.

On pill casting wheel 3, generally there are two seat boards, form two end plates of pill casting wheel 3, the generally use both ends of blade 31 Fixed form, corresponding to be arranged on two end plates, this Standard reliability is high, it is ensured that the dynamic stiffness of blade.But Inventor thought because blade stiffness by itself is higher, the necessity using both-end plate be not it is very big, and bullet be to from Heart side throwing is from relatively simple without the axial direction projectile along pill casting wheel 3, single-ended fixation, assembly technology.Therefore, in Fig. 5 institutes In the structure shown, single-ended fixation is used to blade 31, fixing end provides impeller 32, and impeller 32 is the installing matrix of blade 31, In structure shown in Fig. 5 and 6, the structure for blade installation is blade groove 323, is locked using type and realizes connection, to blade 31 Stiffness by itself destroys small.

The blade 31 fixed for both-end, blade 31 is fixed, it is necessary in leaf by the way of bolt is worn mostly Bolt hole is opened on piece 31, and blade 31 is generally than relatively thin, it is obvious to local strength reduction after opening bolt hole.

In figures 7 and 9, blade 31 is from centripetal end to the two segment structure for centrifuging end, first paragraph as shown in Figure 7 315 and second segment 317, this two sections are flat board, are seamlessly transitted between two sections by changeover portion 316 as shown in Figure 7, transition Section 316 is tangent with first paragraph 315 and second segment 317, ensures the continuity of blade 31.

Blade mainly has two kinds at present, and one kind is flat blade, and the working face of blade is flat board, and another kind is forward curve blade, The working face of blade is cambered surface or other curved surfaces, and the blade construction shown in Fig. 7 is compared to plane blade, first paragraph 315 and Angle between two section 317 is bigger, and the pressure of blade 31 is bigger, therefore ejection velocity is bigger, but the abrasion to blade 31 is also tighter Weight, therefore the life-span is shorter；For forward curve blade, because the forward curve blade will also be by a bigger centripetal force, therefore this implementation The pressure suffered by blade 31 in example is smaller, and ejection velocity is smaller, but the life-span has been lifted, comparatively, Blade 31 according to the utility model embodiment has plane blade and forward curve blade concurrently a little.

Because bullet is accelerated always on blade 31, so the plane of theoretical blade 31 is longer, speed is bigger；And because The pressure of the plate part at centripetal end 314 is significantly greater than in the pressure of the plate part at the centrifugation of blade 31 end 311, therefore increases blade The length of the plate part at 31 centrifugation ends 311, speedup effect are more obvious.Therefore in a preferred embodiment, positioned at centrifugation end 311 slab length d2 is more than the slab length d1 positioned at centripetal end 314.

Preferably, d2 is 1.2 ~ 1.5 times of d1.

In addition, as it was previously stated, the relation of blade wear and ejection velocity is considered, between two flat boards on same blade Angle is 165 ~ 175 degree.

And then on the fixed structure of blade 31, it is configured to be molded over the second dovetail groove or second T-shaped of impeller end face Groove, blade groove 323 as shown in Figure 6, and the first pin-and-hole is provided with the centrifugation end of the second dovetail groove or the second T-slot, such as Pin-and-hole 321 shown in Fig. 6.

Correspondingly, the portions of blade 31, mounting seat 313 as shown in Figure 7, are configured to dovetail configuration or T-type structure, And accordingly it is provided with the second pin-and-hole or block seat.

One connecting pin is provided, the centrifugation of blade is constrained to the free degree by the first pin-and-hole and the second pin-and-hole or block seat.

When as shown in fig. 7, the structure constrained on blade by connecting pin is block seat 312, rather than pin-and-hole, this structure Stress concentration is smaller, is advantageous to improve overall service life.Correspondingly, on this condition, connecting pin is configured to backing pin.

In addition, as shown in figure 8, hopper 11（Also known as entering pills apparatus）It is integrated with orienting cover construction, integrally casting.Orienting cover portion Divide length L, orienting cover opening is a square, and window 12 of dishing out as shown in Figure 8, its length of side takes l, to ensure that bullet is efficient Dish out, therefore openings of sizes is：

L=（0.4-0.6）l.

Assuming that the horizontal range that the tail end of hopper 11 extends to orienting cover part is L ', then：

L’=(0.3-0.35)L。

Assuming that the outer wall of hopper 11（Wall away from housing 4）Angle with level is A, inwall（Close to the wall of housing 4） Angle with level is A ', and hopper first half straight line portion and following circular arc portion are tangent, Inner arc（Up Highway UHW）Radius is R1, External arc（Down Highway）Radius is R2, and inside and outside circular arc concentric, the center of circle are located on same vertical line with opening left side.To subtract Impact of the dust-shot to pipeline, takes：

Angle be A '=（1.3-1.5）A.

A=（40-60）°.

For the other structures parameter of pill casting wheel, it is described below：

Assuming that shot wheel total length is E, the length for such as inlaying post 23 is e1, then：

e1=(0.70-0.85)E。

Assuming that the 23 unilateral distance beyond shot wheel window of edge post is e2（The part coordinated with embedding slot）, to ensure to coordinate Reliably, take：

e2=0.03-0.05E。

Assuming that 31 body thicknesses of blade are h, blade fixed part（Thickness of the mounting seat 313 on vane thickness direction）It is thick Spend for H, then：

h=(0.25-0.35)H。

Assuming that the chamfering of blade fixed part is α（When mounting seat 313 is using dovetail configuration, α herein is the bottom of dovetail Angle）, then：

α=25-35°。

Claims (10)

1. a kind of impeller head, including housing, and the shot wheel that the pill casting wheel and pill casting wheel being contained in housing coaxially assemble, Also include being assemblied on housing from one end, and the feed arrangement of bullet is provided to shot wheel, it is characterised in that the shot wheel One end is for the seat that is assembled between pill casting wheel, and the other end is the end ring body for accepting feed arrangement, ring between seat and end ring body Shape is arranged with the cylinder for determining to divide ball hole；

The cylinder at least centrifuges side and peripheral side is powdered metallurgical material body.

2. impeller head according to claim 1, it is characterised in that the cylinder has：

First structure, generally powdered metallurgical material body；Or

Second structure, cylinder include the cell body with the matrix post and a powdered metallurgical material material of end ring body and seat one；

Corresponding to first structure, in being provided with embedding slot on seat and end ring body, for the present assembling with end ring body of cylinder；

Corresponding to the second structure, cell body is buckled on cylinder, and wraps the centripetal side of cell body and circumferential both sides.

3. impeller head according to claim 2, it is characterised in that corresponding to first structure, embedding slot has shot wheel axle To restraining structure.

4. impeller head according to claim 3, it is characterised in that the embedding slot is the first dovetail groove or the first T-slot.

5. according to any described impeller head of claim 1 ~ 4, it is characterised in that pill casting wheel has single-ended seat board, the single-ended seat Plate is impeller, and impeller is provided with blade fixing structure；

Correspondingly, blade is fixed on impeller by the blade fixing structure.

6. impeller head according to claim 5, it is characterised in that blade is the two segment knot from centripetal end to centrifugation end Structure；

Two segment in above-mentioned two segment structure is flat board；

It is connected between two flat boards by the transition arcs tangent with two flat board opposite ends.

7. impeller head according to claim 6, it is characterised in that the slab length d2 positioned at centrifugal step is more than positioned at centripetal The slab length d1 at end.

8. impeller head according to claim 7, it is characterised in that d2 is 1.2 ~ 1.5 times of d1.

9. impeller head according to claim 6, it is characterised in that the angle between two flat boards is 165 ~ 175 degree.

10. impeller head according to claim 5, it is characterised in that blade fixing structure is be molded over impeller end face Two dovetail grooves or the second T-slot, and it is provided with the first pin-and-hole at the centrifugation end of the second dovetail groove or the second T-slot；

Correspondingly, the portions of blade are configured to dovetail configuration or T-type structure, and are accordingly provided with the second pin-and-hole or block seat；

One connecting pin is provided, the centrifugation of blade is constrained to the free degree by the first pin-and-hole and the second pin-and-hole or block seat.