CN206377069U - A kind of return channel and diffuser integral structure and centrifugal compressor - Google Patents

Abstract

The utility model provides a kind of return channel and diffuser integral structure and centrifugal compressor, including diffuser portion and with the integrally formed return channel part of the diffuser portion, the diffuser portion is used to form diffusion runner, the return channel part has backflow runner, the backflow runner and the diffusion flow passage, for carrying out water conservancy diversion to the gas from the diffusion runner.Integral structure of the present utility model, diffuser portion and return channel sectoral integration turn into a parts, not only without individually assembling return channel and diffuser, and eliminate because of the connection gap that assembling is produced, and dislocation etc. caused by accumulated error, so that gas can flow into backflow runner by diffusion runner much smootherly, energy loss is small；Be not in that a part of air-flow after gas leakage, escapes the guide functions of return channel at gap, and to the phenomenon that the gas after return channel water conservancy diversion is impacted, water conservancy diversion effect can be improved, make airflow homogeneity more preferable.

Description

A kind of return channel and diffuser integral structure and centrifugal compressor

Technical field

The utility model is related to centrifugal compressor technical field, and in particular to a kind of return channel and diffuser integral structure And centrifugal compressor.

Background technology

Centrifugal compressor is also known as runoff compressor, is widely used in various technological processes, is mainly used to conveying air, each Process gas or mixed gas are planted, and improves its pressure.Multistage centrifugal compressor generally comprises main shaft, one stage impeller, one-level and expanded Depressor cover plate, one-level diffuser, return channel, sencond stage impeller, two grades of diffuser cover plates, two grades of diffusers etc..During compressor operating, Main shaft drives one stage impeller to rotate, and the gas from inlet plenum is thrown to by one-level diffuser cover plate and one-level diffusion by one stage impeller In the one-level diffusion runner of device formation, gas is passed through after one-level diffusion runner, the air inlet entered through return channel in front of sencond stage impeller Runner；Sencond stage impeller is equally driven by main shaft and rotated, and the gas from air inlet runner is thrown to by two grades of diffusers by sencond stage impeller Cover plate and two grades of diffusion runners of two grades of diffuser formation, in the process, gas is gradually compressed, so that with very high pressure Power.In centrifugal compressor, the effect of return channel is water conservancy diversion, guide flowed out from one-level diffusion runner strong curl up air-flow with Circumference or specific direction are evenly into next stage impeller.

In the prior art, return channel exists usually as a single parts, and it passes through screw pin with diffuser Or be welded to connect, realize fastening and position.This structure type of the prior art has following technological deficiency：1) assembly precision Low, energy loss is big, and return channel, it is necessary to first align when being connected with diffuser, then passes through again as a single parts Screw pin or welding manner connection, in the process, only connection gap, also easily because cumulative departure misplaces, does not come When impacting connection gap or misalignment position from the gas of diffusion runner, it may appear that larger energy loss, such as kinetic energy rejection, punching Crushing mistake etc.；2) efficiency of assembling is low, due to needing to realize high accuracy install, causes assembling speed slow, efficiency is low；3) return channel with After diffuser connection, there is gap between return channel blade end and diffuser, the gas from diffusion runner is easily from the position Gas leakage is put, so as to escape the guide functions of return channel, and the gas after return channel water conservancy diversion is impacted, infringement air-flow is uniform Property；4) when return channel is connected with diffuser by screw or pin, it is necessary to open screwed hole on return channel blade, then use Screw or pin are passed through after diffuser with the screw hole, realization fixation, this connected mode, it is necessary to the blade tool of return channel There is certain thickness, this is resulted in, and return channel intra vane quantity is few, and further result in the air-flow that blade angle impacts with gas Angular difference value is big, produces the larger air-flow angle of attack, not only bad for water conservancy diversion, there is also energy loss, and such as punching press is lost.

Utility model content

Therefore, the technical problems to be solved in the utility model is to overcome return channel of the prior art independent as one Parts need to be connected with diffuser by bolt screw or welding manner, cause efficiency of assembling low and energy loss be big Technological deficiency, so as to provide a kind of efficiency of assembling is high, energy loss is small return channel and diffuser integral structure.

The utility model also provides a kind of centrifugal compressor integrated with diffuser with above-mentioned return channel.

Therefore, the utility model provides a kind of return channel and diffuser integral structure, it is characterised in that：Including diffuser Part and with the integrally formed return channel part of the diffuser portion, the diffuser portion be used for form diffusion runner, institute Stating return channel part has backflow runner, the backflow runner and the diffusion flow passage, for from the diffusion stream The gas in road carries out water conservancy diversion.

As a kind of preferred scheme, the diffuser portion and the return channel part pass through casting integrated shaping.

As a kind of preferred scheme, the backflow runner has an inlet and outlet, and the width a≤described of the import goes out The width b of mouth.

It is used as a kind of preferred scheme, four times of width b no more than the width a of the import of the outlet.

As a kind of preferred scheme, the side of the backflow runner is vertical, and opposite side is along the import to the exporter To being gradually flared out, and the angle between the opposite side and vertical direction is β, and 0≤β≤45 °.

As a kind of preferred scheme, the backflow runner inner wall is provided with reflux blade, the reflux blade into tandem or It is single-row to be uniformly distributed.

As a kind of preferred scheme, the outer ledge of the reflux blade is fixedly connected with the inwall of the backflow runner, And the reflux blade is in contact the tangent line of position with the inwall of the backflow runner, with being flowed back described in relevant position in runner It is 10 °~80 ° that blade angle α, the blade angle α are formed between the tangent line of wall.

As a kind of preferred scheme, in addition to diffusion blade, it is arranged on inside the diffusion runner.

As a kind of preferred scheme, the width of the diffusion blade is not more than corresponding thereto to feed gas into the diffusion The width of the impeller of runner.

The utility model also provides a kind of centrifugal compressor, including main shaft, the impeller on the main shaft, and diffusion Device cover plate, in addition to the as above integral structure described in any one；The diffuser cover plate is relative with the diffuser with formation The diffusion runner.

As a kind of preferred scheme, the centrifugal compressor is at least two-stage, the return channel part of previous stage and rear stage Sencond stage impeller between there is receiving space, the receiving space connects with air supply passage, and the air supply passage is for described Receiving space make-up gas.

As a kind of preferred scheme, the air supply passage is connected with expansion valve, for it will be expanded through the expansion valve after Part of refrigerant is input in the receiving space with cooling and tonifying Qi.

The technical scheme that the utility model is provided, with advantages below：

1. return channel of the present utility model and diffuser integral structure, including diffuser portion and return channel part, and And diffuser portion and return channel sectoral integration turn into a parts, are no longer in the prior art by screw pin or weldering The mode such as connect by single diffuser and the secondary structure type linked into an integrated entity of single return channel, it is such due to having carried out Design, integral structure of the present utility model is eliminated because of assembling production not only without individually assembling return channel and diffuser Raw connection gap, and dislocation etc. caused by accumulated error, so that gas can be much smootherly by diffusion runner stream Enter the runner that flows back, energy loss is small；Behind return channel part and diffuser portion integrated design, reflux blade is separately arranged at Flow back in runner, without being connected again with diffuser, eliminate and there is seam between reflux blade end and diffuser in the prior art The problem of gap causes gas leakage, a part of air-flow would not also occur and after gas leakage, escape the guide functions of return channel at gap, and The phenomenon impacted to the gas after return channel water conservancy diversion, thus integral structure of the present utility model is used for centrifugal compressor When, moreover it is possible to water conservancy diversion effect is improved, makes airflow homogeneity more preferable.Preferably, diffuser portion and return channel part pass through casting It is integrally formed.

2. integral structure of the present utility model, due to the gas entered from diffusion runner in backflow runner be flow velocity compared with Big non-stationary flow, flow losses are larger, design the width of width≤outlet of import, backflow runner can be made to play certain Diffusion action, reduces flow velocity, improves the stability of gas flowing；Roughness in view of the runner inner surface that flows back is larger, enters one Step design exit width is no more than four times of entrance width, it is ensured that gas smoothly flows through backflow runner；The one of backflow runner Side is vertical, and opposite side gradually opens along import to Way out, the angle of the opposite side and vertical direction between 0 to 45 °, Gas can be guided to be flowed towards side, water conservancy diversion effect is improved.

3. integral structure of the present utility model, return channel vias inner walls are provided with reflux blade, and reflux blade is into tandem Or it is single-row be uniformly distributed so that by the equably water conservancy diversion of the gas in diffusion runner.

4. integral structure of the present utility model, the outer ledge of reflux blade is fixedly connected with the inwall for the runner that flows back, And reflux blade is in contact with the inwall for the runner that flows back between the tangent line of position, and the tangent line of relevant position backflow runner inner wall Blade angle is formed, blade angle is between 10-80 °；This structure design, can make the blade angle of reflux blade with The actual flow angle of air-flow is more consistent, so as to reduce impact loss.

5. integral structure of the present utility model, higher types are required airflow homogeneity for some, such as heat pump or Ice cold-storage unit, in order to ensure to heat or ice charging also reaches higher performance, is additionally provided with inside diffusion runner Diffusion blade, diffusion blade can carry out preliminary water conservancy diversion to entering the air-flow in diffusion runner, be then input to backflow runner In carrying out secondary water conservancy diversion, so as to further improve the uniformity of air-flow.

6. integral structure of the present utility model, the width of diffusion blade is not more than corresponding thereto to feed gas into diffusion The width of the impeller of runner, so as to prevent gas backstreaming, it is ensured that the convergence of flowing.

7. the utility model also provides a kind of centrifugal compressor, including main shaft, impeller, diffuser cover plate and as above any Integral structure described in, as a result of above-mentioned integral structure, thus with because using above-mentioned integral structure institute All advantages brought.

8. centrifugal compressor of the present utility model is at least two-stage, and the return channel part of previous stage and two grades of rear stage There is receiving space, receiving space is connected with air supply passage between impeller, air supply passage is used for receiving space make-up gas, from And improve compression efficiency；In addition, when for refrigeration plant, after the compressed boosting of gas, temperature is higher, now air supply passage with Expansion valve is connected, and the cryogenic gas after a part of expanded valve expansion is inputted into receiving space, tonifying Qi effect is not only acted as, also rises To cooling effect.

Brief description of the drawings

In order to illustrate more clearly of the technical scheme in prior art or the utility model embodiment, below to existing There is the accompanying drawing used in technology or embodiment description to be briefly described, it should be apparent that, for the common skill in this area For art personnel, on the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.

Fig. 1 is the structural representation of the utility model return channel and diffuser integral structure.

Fig. 2 is structural representation of the reflux blade in the runner that flows back during bunchiness column distribution.

Fig. 3 is reflux blade in backflow runner into structural representation during single-row distribution.

Fig. 4 is the profile after integral structure of the present utility model is installed on main shaft.

Fig. 5 is the structural representation that one-level diffusion blade is distributed in diffusion runner.

Fig. 6 is the structural representation that two grades of diffusion blades are distributed in diffusion runner.

Fig. 7 is provided with the section after the integral structure of one-level diffusion blade and two grades of diffusion blades is installed on main shaft Figure.

Reference：1- diffuser portions, 10- diffusion runners, 13- diffusion blades, 2- return channels part, 20- backflow streams Road, 21- imports, 22- outlets, 23- reflux blades, 4- diffuser cover plates, 5- receiving spaces, 6- air supply passages, 7- sencond stage impellers, Bis- grades of diffusion runners of 8-, bis- grades of diffusion cover plates of 9-.

Embodiment

The technical solution of the utility model is described with reference to Figure of description, it is clear that following embodiments are not It is the whole embodiment of the utility model.Based on the embodiment described by the utility model, those of ordinary skill in the art are not having There is the every other embodiment made and obtained under the premise of other creative works, belong to protection domain of the present utility model.

It should be noted that in description of the present utility model, term " first ", " second " are only used for describing purpose, and It is not intended that indicating or implying relative importance.In addition, involved in the utility model different embodiments disclosed below As long as and technical characteristic do not constitute each other conflict can just be combined with each other.

Embodiment 1

The present embodiment provides a kind of return channel and diffuser integral structure, as shown in figure 1, including the He of diffuser portion 1 With the integrally formed return channel part 2 of the diffuser portion 1, the diffuser portion 1 is used to form diffusion runner 10, described Return channel part 2 has backflow runner 20, and the backflow runner 20 is connected with the diffusion runner 10, for expanding from described The gas of runner 10 is pressed to carry out water conservancy diversion.

The return channel of the present embodiment and diffuser integral structure, diffuser portion 1 and the integration of return channel part 2 turn into One parts, is no longer to be flowed back in the prior art by modes such as screw pin or welding by single diffuser and individually The secondary structure type linked into an integrated entity of device, due to having carried out such design, the integral structure of the present embodiment not only need not Individually assembling return channel and diffuser, and eliminate because of the connection gap that assembling is produced, and the mistake caused by accumulated error Position etc., so that gas can flow into backflow runner 20 by diffusion runner 10 much smootherly, energy loss is small；Return channel part 2 with the integrated design of diffuser portion 1 after, reflux blade 23 be separately arranged at backflow runner 20 in, without again with diffuser Connection, eliminates and there is the problem of gap causes gas leakage between the end of reflux blade 23 and diffuser in the prior art, also just not Occur that a part of air-flow after gas leakage, escapes the guide functions of return channel at gap, and to the gas after return channel water conservancy diversion The phenomenon impacted, thus integral structure of the present utility model be used for centrifugal compressor when, moreover it is possible to improve water conservancy diversion effect, make Airflow homogeneity is more preferable.In the present embodiment, diffuser portion 1 and return channel part 2 pass through casting integrated shaping.

As in Figure 2-4, the backflow runner 20 has import 21 and outlet 22, and width a≤institute of the import 21 The width b of outlet 22 is stated, because the gas entered from diffusion runner 10 in backflow runner 20 is the larger non-stationary flow of flow velocity, Flow losses are larger, design the width b of width a≤outlet 22 of import 21, backflow runner 20 can be made to play certain diffusion Effect, reduces flow velocity, improves the stability of gas flowing.Roughness in view of the inner surface of runner 20 that flows back is larger, further Four times of width b no more than the width a of import 21 of design outlet 22, it is ensured that gas smoothly flows through backflow runner；This reality Apply in example, the width a of import 21 is the 4/5 of exit width b.

The side of the backflow runner 20 is vertical, and opposite side is gradually outwards opened along the import 21 to 22 directions of the outlet Open, and the angle between the opposite side and vertical direction is β, and 0≤β≤45 °, this design structure, gas can be guided Body flows towards the side of setting, improves water conservancy diversion effect.

Backflow runner 20 inwall is provided with reflux blade 23, as shown in Fig. 2 reflux blade 23 uniformly divides into tandem Cloth, and the thickness of reflux blade 23 is 5-40mm, and quantity is 3-50；Relatively low common are required for airflow homogeneity to some Type, also can be uniformly distributed form, as shown in Figure 3 using single-row.

The outer ledge of the reflux blade 23 is fixedly connected with the inwall of the backflow runner 20, and the backflow leaf Piece 23 is in contact the tangent line of position, the tangent line with the inwall of runner 20 that flowed back described in relevant position with the inwall of the backflow runner 20 Between form blade angle α, the blade angle α is 10 °~80 °.This structure design, can make the leaf of reflux blade 23 The actual flow angle of piece established angle α and air-flow is more consistent, so as to reduce impact loss.

As illustrated in figs. 5-7, in addition to diffusion blade 13, it is arranged on inside the diffusion runner 10, diffusion blade 13 may be used also To be arranged on return channel part 2.Diffusion blade 13 can carry out preliminary water conservancy diversion to entering the air-flow in diffusion runner 10, so After be input in backflow runner 20 and carrying out secondary water conservancy diversion, so as to further improve the uniformity of air-flow.In addition, diffusion blade 13 It can also be arranged on for the diffusion cover plate 4 with the formation diffusion runner of diffuser portion 1.

The width of the diffusion blade 13 is not more than impeller 3 corresponding thereto to feed gas into the diffusion runner 10 Width.As in Fig. 7, c is the thickness of one-level diffusion blade 13, and d is the thickness of two grades of diffusion blades 13, one-level diffusion blade 13 Thickness is less than the thickness B1 of impeller 3 in Fig. 1, and two grades of diffusion blades 13 are less than the thickness B2 of sencond stage impeller 7 in Fig. 1, so as to Prevent gas backstreaming, it is ensured that the convergence of flowing.

The integral structure of the present embodiment, cannot be only used for two-stage centrifugal compressor, it may also be used for more than three-level or three-level Centrifugal compressor.

Embodiment 2

The present embodiment provides a kind of centrifugal compressor, including main shaft, the impeller 3 on the main shaft, and diffuser Cover plate 4, in addition to integral structure as described in example 1 above；The diffuser cover plate 4 is relative with shape with the diffuser 1 Into the diffusion runner 10.

The centrifugal compressor of the present embodiment, as a result of above-mentioned integral structure, thus with because using above-mentioned one All advantages that body structure is brought.

The centrifugal compressor is two-stage, has between the return channel part 2 of previous stage and the sencond stage impeller 7 of rear stage and holds Receive space 5, the receiving space 5 is connected with air supply passage 6, the air supply passage 6 is used to supplement gas to the receiving space 5 Body, so as to improve compression efficiency.

The course of work of two-stage centrifugal compressor is：Main shaft impeller 3 is rotated, and gas is got rid of into by diffuser cover plate 4 In the diffusion runner 10 of the formation of diffuser portion 1, gas enters from diffusion runner 10 enters receiving space 5 through the runner 20 that flows back Position, sencond stage impeller 7 is equally driven by main shaft and rotated, and the gas in receiving space 5 is further got rid of into by two grades of diffusions In device cover plate 9 and two grades of diffusion runners 8 of integral structure formation, so that further lift gas pressure.

As a kind of preferred scheme, when the centrifugal compressor of the present embodiment is used for refrigeration plant, the air supply passage 6 with Expansion valve is connected, for the part of refrigerant after being expanded through the expansion valve to be input in the receiving space 5 to cool And tonifying Qi, tonifying Qi effect is not only acted as, cooling effect is also acted as.

Obviously, above-described embodiment is only intended to clearly illustrate example, and the not restriction to embodiment.It is right For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of change or Change.There is no necessity and possibility to exhaust all the enbodiments.And the obvious change thus extended out or Among changing still in protection domain of the present utility model.

Claims (12)

1. a kind of return channel and diffuser integral structure, it is characterised in that：Including diffuser portion (1) and with the diffuser Partly (1) integrally formed return channel part (2), the diffuser portion (1) is used to form diffusion runner (10), the backflow Device part (2) has backflow runner (20), and the backflow runner (20) connects with the diffusion runner (10), for from institute The gas for stating diffusion runner (10) carries out water conservancy diversion.

2. integral structure according to claim 1, it is characterised in that：The diffuser portion (1) and the return channel Partly (2) pass through casting integrated shaping.

3. integral structure according to claim 1, it is characterised in that：It is described backflow runner (20) have import (21) and Export (22), and the width b of the width a≤outlet (22) of the import (21).

4. integral structure according to claim 3, it is characterised in that：The width b of the outlet (22) is no more than described Four times of the width a of import (21).

5. the integral structure according to claim 3 or 4, it is characterised in that：The side of the backflow runner (20) is vertical, Opposite side is gradually flared out along the import (21) to described outlet (22) direction, and between the opposite side and vertical direction Angle be β, and 0≤β≤45 °.

6. integral structure according to claim 1, it is characterised in that：Described backflow runner (20) inwall is provided with backflow Blade (23), the reflux blade (23) is into tandem or single-row is uniformly distributed.

7. integral structure according to claim 6, it is characterised in that：The outer ledge of the reflux blade (23) and institute The inwall for stating backflow runner (20) is fixedly connected, and the reflux blade (23) connects with the inwall of the backflow runner (20) The tangent line of position is touched, blade angle α, the blade are formed between the tangent line of runner (20) inwall that flowed back described in relevant position Established angle α is 10 °~80 °.

8. integral structure according to claim 1, it is characterised in that：Also include diffusion blade (13), be arranged on described Diffusion runner (10) is internal.

9. integral structure according to claim 8, it is characterised in that：The width of the diffusion blade (13) be not more than with It is relative with the width for the impeller (3) for feeding gas into the diffusion runner (10).

10. a kind of centrifugal compressor, including main shaft, the impeller (3) on the main shaft, and diffuser cover plate (4), it is special Levy and be：Also include integral structure as claimed in any one of claims 1-9 wherein；The diffuser cover plate (4) is expanded with described Depressor (1) is relative to form the diffusion runner (10).

11. centrifugal compressor according to claim 10, it is characterised in that：The centrifugal compressor is at least two-stage, preceding Between the return channel part (2) of one-level and the sencond stage impeller (7) of rear stage have receiving space (5), the receiving space (5) with Air supply passage (6) is connected, and the air supply passage (6) is used for the receiving space (5) make-up gas.

12. centrifugal compressor according to claim 11, it is characterised in that：The air supply passage (6) connects with expansion valve, For the part of refrigerant after being expanded through the expansion valve to be input in the receiving space (5) with cooling and tonifying Qi.