CN117722239A - Inner cylinder structure of turboexpander and turboexpander - Google Patents

Abstract

The invention relates to the technical field of turbo expanders, in particular to an inner cylinder structure of a turbo expander and the turbo expander, wherein the inner cylinder structure of the turbo expander comprises an inner cylinder body, an upper half shell and a lower half shell, the upper half shell and the lower half shell are buckled to form a cavity, a spiral flow channel is formed in the inner wall of the cavity, a first air inlet channel is formed in the upper half shell and is communicated with an air inlet end of the spiral flow channel, and the first air inlet channel is arranged along the tangential direction of the air inlet end; the plurality of red lantern rings are sleeved on the inner cylinder body at intervals, and are in interference fit with the inner cylinder body; the connecting bolts are in threaded connection with the upper half shell and the lower half shell; the anti-overturning assembly is matched with the inner cylinder body and used for preventing the inner cylinder body from overturning relative to the outer cylinder. The invention can reduce the leakage of the inner cylinder and the leakage of working medium.

Description

Inner cylinder structure of turboexpander and turboexpander

Technical Field

The invention relates to the technical field of turboexpanders, in particular to an inner cylinder structure of a turboexpander and the turboexpander.

Background

A turbo expander (turbin) is a machine for converting energy stored in a fluid medium into mechanical work, and a special turbo expander is used as key equipment for power circulation such as compressed air energy storage and supercritical carbon dioxide, and the performance of the turbo expander has a great influence on circulation efficiency, transient performance, operation range, operation cost and the like.

The inner cylinder of the turbine expander is formed by the involution of the upper half shell and the lower half shell, the upper half shell and the lower half shell are connected through bolts, when the inner cylinder of the turbine expander works at high temperature and high pressure, leakage can occur at the joint surface of the upper half shell and the lower half shell, and in the air inlet process, working medium can be partially impacted with the inner cylinder, so that the working medium leakage is large.

Accordingly, there is a need for a turboexpander inner cylinder structure and turboexpander that address the above-described problems.

Disclosure of Invention

The invention aims to provide an inner cylinder structure of a turbine expander and the turbine expander, which can reduce the leakage amount of an inner cylinder and reduce the leakage amount of working media.

To achieve the purpose, the invention adopts the following technical scheme:

an internal cylinder structure of a turboexpander, comprising:

the inner cylinder body comprises an upper half shell and a lower half shell, wherein the upper half shell is buckled with the lower half shell to form a cavity, a spiral flow channel is formed in the inner wall of the cavity, a first air inlet channel is formed in the upper half shell and is communicated with the air inlet end of the spiral flow channel, and the first air inlet channel is arranged along the tangential direction of the air inlet end;

the plurality of red lantern rings are sleeved on the inner cylinder body at intervals, and are in interference fit with the inner cylinder body;

the connecting bolts are in threaded connection with the upper half shell and the lower half shell;

the anti-overturning assembly is matched with the inner cylinder body and used for preventing the inner cylinder body from overturning relative to the outer cylinder.

Further, a second air inlet channel is arranged on the lower half shell and is communicated with the air inlet end of the spiral flow channel, and the second air inlet channel is arranged along the tangential direction of the air inlet end.

Further, the spiral streamline of the spiral flow channel is an equiangular spiral line.

Further, a first connecting plate is arranged on the upper half shell, a second connecting plate opposite to the first connecting plate is arranged on the lower half shell, and a plurality of connecting bolts penetrate through the first connecting plate and are in threaded connection with the second connecting plate.

Further, the anti-overturning assembly comprises an upper boss and a lower boss, the upper boss is arranged on the upper half shell, the lower boss is arranged on the lower half shell, and the upper boss and the lower boss are matched with the outer cylinder, so that the position of the inner cylinder body relative to the outer cylinder is fixed.

Further, the inner cylinder body is arranged on the bearing seat, a centering beam is arranged on the bearing seat, an abutting groove is formed in the lower half shell, the abutting groove extends to the upper half shell, and the centering beam abuts against the end face of the upper half shell through the abutting groove.

Further, the anti-overturning assembly comprises a plurality of anti-overturning pins, and the anti-overturning pins are arranged on the outer cylinder and are abutted with the inner cylinder body.

Further, the inner cylinder body is provided with a plurality of abutting planes, and the abutting planes and the anti-overturning pins are arranged in one-to-one correspondence.

Further, the interference of the fit of the red lantern ring and the inner cylinder body is 0.5 per mill of the inner diameter of the red lantern ring.

A turboexpander comprises the inner cylinder structure of the turboexpander.

The invention has the beneficial effects that:

the invention provides an inner cylinder structure of a turbine expander, wherein an inner cylinder body comprises an upper half shell and a lower half shell which are buckled with each other, a cavity is formed by buckling the upper half shell and the lower half shell, a spiral flow passage is formed in the inner wall of the cavity, a first air inlet passage is formed in the upper half shell and is communicated with the air inlet end of the spiral flow passage, the first air inlet passage is arranged along the tangential direction of the air inlet end, a plurality of red lantern rings are sleeved on the inner cylinder body at intervals, the red lantern rings are in interference fit with the inner cylinder body, and the upper half shell and the lower half shell are in threaded connection through connecting bolts. The inner cylinder body is sleeved with the red lantern ring in an interference mode, and is connected with the inner cylinder body in a threaded mode through the connecting bolt. Compared with the prior art, the red lantern ring is used for replacing part of bolts, so that the use of connecting bolts is reduced, and the leakage amount of the inner cylinder can be reduced through the cooperation of the red lantern ring and the connecting bolts; through adopting the mode of tangential air inlet, can promote the high efficiency of air inlet, reduce flow loss to reduce the leakage volume of working medium. Through setting up the subassembly of preventing overturning, can eliminate the interior jar upset moment that tangential air intake brought to guarantee the stability of interior jar body.

The turbine expander provided by the invention comprises the inner cylinder structure of the turbine expander, so that the leakage amount of the inner cylinder can be reduced, and the leakage amount of working media can be reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly explain the drawings needed in the description of the embodiments of the present invention, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the contents of the embodiments of the present invention and these drawings without inventive effort for those skilled in the art.

FIG. 1 is a schematic view of an internal cylinder structure of a turboexpander according to the present invention;

FIG. 2 is a schematic view of another view of the internal cylinder structure of a turboexpander of the present invention;

FIG. 3 is a cross-sectional view of the anti-roll pin installation in the internal cylinder configuration of a turboexpander of the present invention.

In the figure:

1. an upper half shell; 11. a first air inlet channel; 12. a first connection plate; 2. a lower half shell; 21. a second air inlet channel; 22. a second connecting plate; 23. an abutment groove; 3. a red collar; 4. a connecting bolt; 5. an anti-roll-over assembly; 51. an upper boss; 52. a lower boss; 53. an anti-overturn rotating pin; 6. a spiral flow path; 7. and (5) an outer cylinder.

Detailed Description

Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the following drawings.

In this application, the terms "comprises," "comprising," "has," "having," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

In the present application, the term "and/or" is an association relationship describing an association object, meaning that three relationships may exist. For example, C and/or D may represent: the three cases of C alone, C and D together and D alone exist. In addition, the character "/" in this application generally indicates that the front-rear association object is an "and/or" relationship.

The terms "connected," "coupled," and "mounted" are used herein to describe either a direct connection, a coupling, or an installation, or an indirect connection, a coupling, or an installation. By way of example, two parts or components are connected together without intermediate members, and by indirect connection is meant that the two parts or components are respectively connected to at least one intermediate member, through which the two parts or components are connected. Further, "connected" and "coupled" are not restricted to physical or mechanical connections or couplings, and may include electrical connections or couplings.

In this application, one of ordinary skill in the art will understand that relative terms (e.g., "about," "approximately," "substantially," etc.) used in connection with quantities or conditions are intended to include the values and have the meanings indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a particular value, the tolerance associated with a particular value resulting from manufacture, assembly, use, and the like. Such terms should also be considered to disclose a range defined by the absolute values of the two endpoints. Relative terms may refer to the addition or subtraction of a percentage (e.g., 1%,5%,10% or more) of the indicated value. Numerical values, not employing relative terms, should also be construed as having specific values of tolerance. Further, "substantially" when referring to relative angular positional relationships (e.g., substantially parallel, substantially perpendicular) may refer to adding or subtracting a degree (e.g., 1 degree, 5 degrees, 10 degrees, or more) from the indicated angle.

In this application, one of ordinary skill in the art will understand that a function performed by a component may be performed by one component, multiple components, a part, or multiple parts. Also, the functions performed by the elements may be performed by one element, by an assembly, or by a combination of elements.

In the present application, the terms "upper", "lower", "left", "right", "front", "rear", and the like are described in terms of orientation and positional relationship shown in the drawings, and should not be construed as limiting the embodiments of the present application. In the context of this document, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on the other element or be indirectly on the other element through intervening elements. It should also be understood that the terms upper, lower, left, right, front, back, etc. are not only intended to represent positive orientations, but also to be construed as lateral orientations. For example, the lower side may include a right lower side, a left lower side, a right lower side, a front lower side, a rear lower side, and the like.

In order to reduce the leakage amount of an inner cylinder in the working process of the turboexpander and reduce the leakage amount of working media, the invention provides an inner cylinder structure of the turboexpander, as shown in figures 1-3. The internal cylinder structure of the turboexpander comprises an internal cylinder body, a plurality of red collars 3, a plurality of connecting bolts 4 and an anti-overturning assembly 5.

The inner cylinder body comprises an upper half shell 1 and a lower half shell 2, the upper half shell 1 and the lower half shell 2 are buckled to form a cavity, a spiral runner 6 is formed in the inner wall of the cavity, a first air inlet channel 11 is formed in the upper half shell 1, the first air inlet channel 11 is communicated with the air inlet end of the spiral runner 6, and the first air inlet channel 11 is arranged along the tangential direction of the air inlet end. The plurality of red lantern rings 3 are sleeved on the inner cylinder body at intervals, and the plurality of red lantern rings 3 are in interference fit with the inner cylinder body; a plurality of connecting bolts 4 are screwed with the upper half casing 1 and the lower half casing 2. The anti-overturning assembly 5 is matched with the inner cylinder body, and the anti-overturning assembly 5 is used for preventing the inner cylinder body from overturning relative to the outer cylinder 7.

The inner cylinder body is sleeved with the red lantern ring 3 in an interference mode, and is connected with the inner cylinder body in a threaded mode through the connecting bolt 4. Compared with the prior art, the red lantern ring 3 is used for replacing part of bolts, so that the use of the connecting bolts 4 is reduced, and the leakage amount of the inner cylinder can be reduced through the cooperation of the red lantern ring 3 and the connecting bolts 4; through adopting the mode of tangential air inlet, can promote the high efficiency of air inlet, reduce flow loss to reduce the leakage volume of working medium. Through setting up prevent upset subassembly 5, can eliminate the interior jar upset moment that tangential air intake brought to guarantee the stability of interior jar body. And the structure of the inner cylinder body in the turbine expander is optimized. By reducing the design of the connecting bolts 4, the compact arrangement of the inner cylinder body is realized, the compact structure is beneficial to improving the quick response load adjustment rate of a special turbine expander, and the supporting capability of the special turbine expander for power grid frequency modulation service is improved.

Further, a second air inlet 21 is provided on the lower half shell 2, the second air inlet 21 communicates with the air inlet end of the spiral flow passage 6, and the second air inlet 21 is arranged tangentially to the air inlet end. By providing the second air intake duct 21, the intake speed can be increased, and the second air intake duct 21 is arranged tangentially, and the amount of leakage can be further reduced in cooperation with the spiral flow passage 6.

Further, the spiral streamline of the spiral flow passage 6 is an equiangular spiral. After entering the spiral flow channel 6, the working medium forms a certain annular quantity and uniformly flows out along the annular outlet and enters the downstream flow channel. Therefore, the spiral flow channel 6 is subjected to abstraction treatment, so that the spiral flow channel is simplified into ideal fluid axisymmetric potential flow, the streamline shape is an equiangular spiral line, and when the introduction of the fluid accords with the equiangular spiral line, the flow pressure loss of working media can be reduced to the greatest extent.

Further, a first connecting plate 12 is fixedly arranged on the upper half shell 1, a second connecting plate 22 opposite to the first connecting plate 12 is fixedly arranged on the lower half shell 2, and a plurality of connecting bolts 4 penetrate through the first connecting plate 12 and are in threaded connection with the second connecting plate 22. Specifically, the first connection plate 12 and the second connection plate 22 are both located at the bisecting plane where the upper half shell 1 and the lower half shell 2 are butted. Four connecting holes are formed in the first connecting plate 12, four threaded holes are formed in the second connecting plate 22, and the connecting bolts 4 penetrate through the connecting holes to be in threaded connection with the threaded holes. The first connecting plates 12 are symmetrically arranged two on the upper half shell 1, and the second connecting plates 22 are symmetrically arranged two on the lower half shell 2. Thus, the upper half casing 1 and the lower half casing 2 are fixedly connected by eight connecting bolts 4. The connecting bolt 4 is located at the air inlet volute of the inner shell body, so that the tightness of the air inlet volute can be further ensured, and the leakage amount of working media is reduced. In other embodiments, the arrangement positions and the number of the connection bolts 4 may be set as needed, without being excessively limited thereto.

Further, the anti-overturning assembly 5 comprises an upper boss 51 and a lower boss 52, the upper boss 51 is fixedly arranged on the upper half shell 1, the lower boss 52 is fixedly arranged on the lower half shell 2, and the upper boss 51 and the lower boss 52 are matched with the outer cylinder 7, so that the position of the inner cylinder body relative to the outer cylinder 7 is fixed. Because the inner cylinder body tangentially intakes the inner cylinder overturning moment that can cause, consequently, through the position of upper boss 51 and lower boss 52 all with outer cylinder 7 cooperation locking inner cylinder body, guarantee the stability of inner cylinder.

Further, the inner cylinder body is fixedly arranged on a bearing seat, a centering beam is arranged on the bearing seat, an abutting groove 23 is formed in the lower half shell 2, the abutting groove 23 extends to the upper half shell 1, and the centering beam abuts against the end face of the upper half shell 1 through the abutting groove 23. By providing the abutment groove 23, the end face of the upper half shell 1 corresponding to the abutment groove 23 is exposed, and the centering beam abuts against the end face of the upper half shell 1, thereby preventing the inner cylinder body from turning over. Moreover, by adopting the mode, the structure is compact, and the arrangement is convenient.

Further, the anti-roll-over assembly 5 includes a plurality of anti-roll-over pins 53, the plurality of anti-roll-over pins 53 being disposed on the outer cylinder 7 and abutting the inner cylinder body. The inner cylinder body can be defined by providing the anti-turnover pin 53, thereby further fixing the inner cylinder body and preventing the inner cylinder body from rotating relative to the outer cylinder 7. In this embodiment, three anti-overturning pins 53 are arranged at intervals, the three anti-overturning pins 53 are not in the same straight line, and the anti-overturning pins 53 are fixed on the outer cylinder 7 through locking screws.

Further, the inner cylinder body is provided with a plurality of abutting planes, and the abutting planes are arranged in one-to-one correspondence with the anti-overturning pins 53. Through processing butt plane, can effectively with prevent turning pin 53 cooperation to guarantee the position stability of inner cylinder body relative outer cylinder 7.

Further, the interference of the fit of the red lantern ring 3 and the inner cylinder body is 0.5 per mill of the inner diameter of the red lantern ring 3. The interference of the fit of the red lantern ring 3 and the inner cylinder body is required to meet the requirement that the red lantern ring 3 has a holding force for sealing the middle split surfaces of the upper half shell 1 and the lower half shell 2 under any working condition of start-stop and load variation; secondly, when starting and load rising are considered, as the temperature of the cylinder is higher than that of the red lantern ring 3, the stress of the red lantern ring 3 does not exceed allowable stress; by combining the factors, the interference is designed to be 0.5 per mill of the inner diameter of the red lantern ring 3, so that the requirements can be well met.

The embodiment also provides a turboexpander, which comprises the inner cylinder structure of the turboexpander, so that the leakage amount of the inner cylinder can be reduced, and the leakage amount of working media can be reduced.

It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims (10)

1. An internal cylinder structure of a turboexpander, comprising:

the inner cylinder body comprises an upper half shell (1) and a lower half shell (2), wherein the upper half shell (1) and the lower half shell (2) are buckled to form a cavity, a spiral flow channel (6) is formed in the inner wall of the cavity, a first air inlet channel (11) is formed in the upper half shell (1), the first air inlet channel (11) is communicated with the air inlet end of the spiral flow channel (6), and the first air inlet channel (11) is arranged along the tangential direction of the air inlet end;

the plurality of red lantern rings (3) are sleeved on the inner cylinder body at intervals, and the plurality of red lantern rings (3) are in interference fit with the inner cylinder body;

a plurality of connecting bolts (4), wherein a plurality of connecting bolts (4) are in threaded connection with the upper half shell (1) and the lower half shell (2);

the anti-overturning assembly (5) is matched with the inner cylinder body and used for preventing the inner cylinder body from overturning relative to the outer cylinder (7).

2. The internal cylinder structure of a turboexpander according to claim 1, characterized in that a second air intake duct (21) is provided on the lower half-shell (2), the second air intake duct (21) being in communication with the air intake end of the spiral flow passage (6), and the second air intake duct (21) being arranged tangentially to the air intake end.

3. The internal cylinder structure of a turboexpander according to claim 1, characterized in that the spiral streamline of the spiral runner (6) is an equiangular spiral.

4. The internal cylinder structure of a turboexpander according to claim 1, wherein a first connection plate (12) is provided on the upper half casing (1), a second connection plate (22) opposite to the first connection plate (12) is provided on the lower half casing (2), and a plurality of connection bolts (4) are screwed with the second connection plate (22) through the first connection plate (12).

5. The internal cylinder structure of a turboexpander according to claim 1, wherein the anti-overturning assembly (5) comprises an upper boss (51) and a lower boss (52), the upper boss (51) is arranged on the upper half shell (1), the lower boss (52) is arranged on the lower half shell (2), and both the upper boss (51) and the lower boss (52) are matched with the external cylinder (7) so that the position of the internal cylinder body relative to the external cylinder (7) is fixed.

6. The internal cylinder structure of a turboexpander according to claim 1, characterized in that the internal cylinder body is arranged on a bearing seat, a centering beam is arranged on the bearing seat, an abutting groove (23) is formed in the lower half shell (2), the abutting groove (23) extends to the upper half shell (1), and the centering beam abuts against the end face of the upper half shell (1) through the abutting groove (23).

7. The internal cylinder structure of a turboexpander according to claim 1, characterized in that the anti-overturning assembly (5) comprises a plurality of anti-overturning pins (53), a plurality of said anti-overturning pins (53) being provided on the external cylinder (7) and abutting against the internal cylinder body.

8. The inner cylinder structure of a turboexpander of claim 7, wherein the inner cylinder body has a plurality of abutment planes, and the plurality of abutment planes are disposed in one-to-one correspondence with the plurality of anti-overturning pins (53).

9. The internal cylinder structure of a turboexpander according to claim 7, wherein the interference of the shrink-wrap ring (3) with the internal cylinder body is 0.5 per mill of the internal diameter of the shrink-wrap ring (3).

10. A turboexpander comprising a turboexpander inner cylinder structure according to any one of claims 1 to 9.