CN218953583U - Centrifugal compressor - Google Patents

Abstract

The application provides a centrifugal compressor, which relates to the field of compressors, wherein the centrifugal compressor is communicated with a first pipeline and particularly comprises a stator, wherein a cavity is formed in the stator; a separator installed in the cavity and separating the cavity into a first chamber and a second chamber; the second chamber is communicated with the first pipeline; the first chamber is provided with an air inlet hole and an air outlet hole; the rotor is rotationally connected with the first chamber around the first shaft and positioned between the air inlet hole and the air outlet hole; the first axis is parallel to the intake direction; on a projection plane passing through the first axis, a projection of the air inlet end of the rotor is positioned in a projection of the second chamber. The control that this application utilized second cavity temperature and then influences the temperature of first cavity, improves air inlet temperature, reaches the purpose that prevents the crystallization of rotor front end.

Description

Centrifugal compressor

Technical Field

The present application relates to the field of compressors, and in particular, to a centrifugal compressor.

Background

The existing centrifugal compressor has a very wide application range, is commonly used for compressing media such as air, steam, ammonia and the like, and certain compression media are easily converted into a solid phase or a liquid phase form from a gas phase at a certain temperature, and the solid phase or the liquid phase compression media can have great influence on the rotation of a rotor in the compression process, so that the rotor can be unsmooth to operate, even the rotor is damaged, and the service life of the centrifugal compressor is shortened.

For example, when the compression medium is a special medium such as melamine, crystallization is easy to occur when the temperature is low, so that a large amount of crystals are generated at the front end of the rotor in the air inlet structure when the centrifugal compressor is operated, on one hand, the rotor is operated at a high speed to suck the crystals, and the high-speed movement of the crystals can cause serious physical damage to the impeller; on the other hand, the rotor is arranged in the cavity of the stator, in order to improve the compression efficiency of the impeller, the clearance between the rotor and the cavity wall of the cavity is reduced as far as possible by a person skilled in the art, so that if the front end of the rotor is crystallized, crystalline substances are adhered to the cavity wall, the risk of scraping and rubbing the rotor and the cavity wall is greatly increased, and the reliability of operation is reduced.

Disclosure of Invention

An objective of the embodiments of the present application is to provide a centrifugal compressor, which is used for solving the technical problems that a special compression medium is crystallized at the front end of a rotor and damages the rotor.

In a first aspect, the present utility model provides a centrifugal compressor, communicating with a pipeline, comprising:

a stator provided with a cavity;

a separator installed in the cavity and separating the cavity into a first chamber and a second chamber; the second chamber is communicated with the pipeline; the first chamber is provided with an air inlet hole and an air outlet hole;

the rotor is rotationally connected with the first chamber around the first shaft and positioned between the air inlet hole and the air outlet hole; the first axis is parallel to the intake direction; on a projection plane passing through the first axis, a projection of the air inlet end of the rotor is positioned in a projection of the second chamber.

In an alternative embodiment, the second chamber is provided with a first through hole; the first through hole is communicated with the pipeline.

In an alternative embodiment, the second chamber is further provided with a second through hole; the second through hole communicates with the outside air.

In an alternative embodiment, the stator includes a first housing, a second housing, and a third housing that are fixedly coupled to each other; the first shell is provided with the first through hole, and the first through hole, the second shell and the isolating piece are enclosed to form the second cavity.

In an alternative embodiment, the first housing is provided with an air intake channel; the second shell is provided with an air passage; the third shell and the separator form an air outlet channel; the air inlet channel, the air passing channel and the air outlet channel are communicated with each other to form the first chamber; the air outlet end of the air outlet channel forms the air outlet hole; the air inlet end of the air inlet channel forms the air inlet hole; the rotor extends into the overgas passage.

In an alternative embodiment, the first housing is sealingly connected to the second housing; the second shell is in sealing connection with the isolating piece; the spacer is in sealing connection with the third housing.

In an alternative embodiment, the second chamber is an annular structure.

In an alternative embodiment, the number of the first through holes is 4; each first through hole is uniform Zhou Sheyu to the first housing.

In an alternative embodiment, the centrifugal compressor further comprises a spindle, a bearing, a nut, and a casing; the core shaft is arranged on the box body, and one end of the core shaft extends into the cavity for sleeving the rotor; the bearing sleeve is arranged at the other end of the mandrel and positioned in the box body; the nut is in threaded connection with the mandrel and faces towards the air inlet direction relative to the rotor.

In an alternative embodiment, the mandrel comprises a first mandrel and a second mandrel; the first mandrel is sleeved with the rotor; the second mandrel is sleeved with a bearing; the first mandrel and the second mandrel are meshed and rotate.

Compared with the prior art, the application has the following beneficial effects:

1. the present application separates the cavity into a first chamber and a second chamber by a separator, it being understood that the first chamber is adjacent to and not in communication with the second chamber, the second chamber is communicated with the pipeline, and when the pipeline conveys high-temperature steam to the second chamber, the heat conductivity of the partition piece increases the temperature of the first chamber; on the projection plane that passes the first axle, the projection through rotor inlet end is located in the projection of second cavity, control the temperature of rotor front end, avoid compressing medium to produce crystallization phenomenon at the rotor front end, avoid crystallization to destroy the rotor, increase of service life.

2. The second chamber of this application is equipped with first through-hole, and this first through-hole is favorable to leading-in second chamber with the intraductal high temperature steam of pipeline.

3. The second cavity of this application still is equipped with the second through-hole, and this second through-hole is favorable to deriving the second cavity with the interior high temperature steam of second cavity in order to maintain the pressure of second cavity, avoids too high pressure to damage centrifugal compressor.

4. The stator is formed by fixedly connecting the first shell, the second shell and the third shell with each other.

5. The air inlet channel, the air passing channel and the air outlet channel are communicated with each other to form the first chamber, so that the flow of the compressed medium is facilitated. More preferably, the rotor stretches into the air passage, so that the temperature of the front end of the rotor is ensured, the crystallization phenomenon of a compressed medium is avoided, and the operation reliability is improved.

6. According to the device, the first shell is in sealing connection with the second shell, the second shell is in sealing connection with the isolating piece, and the sealing connection of the two parts ensures that the gases of the first chamber and the second chamber are not communicated with each other, so that the compression quality is improved, and the gas mixing is prevented; the spacer is in sealing connection with the third housing where the sealing connection prevents the compressed medium from escaping to the outside air.

7. The second cavity is in annular structure and is beneficial to being in close contact with the first cavity, and the temperature of each position of the first cavity is guaranteed to be improved.

8. This application 4 first through-holes even Zhou Sheyu first casings for annular structure's second cavity is evenly heated, and the temperature is stable.

9. According to the rotary type rotor, the rotation of the rotor is fixed through the mandrel, the bearing, the nut and the box body, so that the rotation of the rotor is quicker and smoother, and the shaking of the rotor is reduced; in addition, the arrangement of the nut prevents the rotor from being separated from the spindle.

10. According to the bearing, the first mandrel and the second mandrel are meshed and rotated, the rotating speed of the second mandrel is reasonably configured, and the bearing is prevented from being damaged.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a front view of a centrifugal compressor provided in embodiment 1 of the present application;

FIG. 2 is a cross-sectional view of A-A of a centrifugal compressor provided in example 1 of the present application;

FIG. 3 is a front view of a centrifugal compressor provided in embodiment 2 of the present application;

fig. 4 is a front view of a centrifugal compressor provided in embodiment 3 of the present application.

Description of main reference numerals:

1-a stator; 10-a first housing; 100-a first through hole; 101-an air intake passage; 102-sealing the pipe joint; 103-end plates; 11-a second housing; 110-a gas passing channel; 12-a third housing; 120-outlet channels; 13-fastening a screw; 14-a first sealing ring; 15-a second sealing ring; 16-a third sealing ring;

2-spacers;

3-rotor; 30-a first shaft;

4-a mandrel; 40-a first mandrel; 41-a second mandrel;

5-bearing;

6-a nut;

7, a box body; 70-receiving chamber.

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

Example 1

Referring to fig. 1 and 2, a centrifugal compressor provided in an embodiment of the present application is a centrifugal compressor, which is connected to a pipeline (not shown in the figure), and the pipeline in the present application is high-temperature steam, where the temperature is set according to a crystallization condition of a specific compression medium, for example, when the compression medium is melamine, the high-temperature steam is 250 ℃; more preferably, a pressure gauge (not shown in the figure) is arranged between the pipeline and the embodiment, and is used for monitoring the pressure of the centrifugal compressor, and when the pressure is too high, the pipeline is closed in time, so that the centrifugal compressor is prevented from being damaged due to the too high pressure; the centrifugal compressor of the present embodiment specifically includes a stator 1, a separator 2, and a rotor 3.

First, regarding the stator 1, it is provided with a cavity; in the present embodiment, the stator 1 includes a first casing 10, a second casing 11, and a third casing 12 that are fixedly connected to each other, the fixing manners including but not limited to fastening screws 13, welding, and the like; the embodiment adopts a fastening screw 13 mode for fixedly connecting; the first casing 10 is provided with a first through hole 100 for introducing high temperature steam and an air intake passage 101; the second housing 11 is provided with an air passage 110; the third housing 12 and the partition 2 form an air outlet channel 120; the inlet channel 101, the overgas channel 110, and the outlet channel 120 communicate with each other to form a first chamber; the first shell 10 is in sealing connection with the second shell 11; the second shell 11 is connected with the isolating piece 2 in a sealing way; the separator 2 is connected with the third shell 12 in a sealing way; the sealing connection mode includes but is not limited to a sealing ring mode and the like.

In this embodiment, the first through hole 100 is provided with a sealing pipe joint 102, one end of the sealing pipe joint 102 is connected with a pipeline, and the other end is connected with the second chamber; the sealing tube joint 102 has good sealing performance and heat resistance, and is beneficial to the introduction of high-temperature steam.

As shown in fig. 2, the first housing 10 is a ring-shaped housing, the inner ring of which is an air inlet channel 101, and the caliber of the inner ring of which is gradually reduced along the air inlet direction, so as to perform the function of converging, and the air inlet end of the first housing 10 is provided with an end plate 103, and the end plate 103 is provided with the first through hole 100; the second housing 11 is also an annular housing, the inner ring of the second housing 11 is an air passage 110, the caliber of the inner ring of the second housing is gradually enlarged along the air inlet direction to play a role in guiding flow, and the air inlet end of the second housing 11 is in sealing connection with the air outlet end of the first housing 10 through a first sealing ring 14; the third housing 12 is embodied as a volute.

Next, regarding the separator 2, it is installed in the cavity, and separates the cavity into the above-mentioned first chamber and second chamber; specifically, the separator 2 encloses a second chamber with the first casing 10 and the second casing 11; one end of the separator 2 is in sealing connection with the air outlet end of the second housing 11 through a second sealing ring 15, the other end is clamped between the end plate 103 and the third housing 12 and fixedly connected with each other, and the separator 2 is in sealing connection with the third housing 12 through a third sealing ring 16.

Due to the arrangement of the first sealing ring 14 and the second sealing ring 15, the gas of the first chamber and the gas of the second chamber are not communicated with each other, the compression quality is improved, and the gas mixture is prevented; the third sealing ring 16 effectively prevents the compressed medium from leaking to the outside air, and improves the compression quantity.

Specifically, the first chamber is provided with an air inlet hole and an air outlet hole; it will be appreciated that the outlet end of the outlet channel 120 forms the outlet aperture, and the inlet end of the inlet channel 101 forms the inlet aperture.

The second chamber is communicated with the pipeline; more preferably, the second chamber is of an annular structure, and the annular structure is beneficial to ensuring that the temperature of each position of the first chamber is effectively improved; further, the second chamber is provided with the first through holes 100 which are communicated with the pipeline, in this embodiment, the number of the first through holes 100 is 1, which are opened on the end plate 103 of the first shell 10, it can be understood that the first through holes 100 are used for entering high-temperature steam, and the high-temperature steam is discharged by utilizing the gap between the end plate 103 and the separator 2;

more preferably, the second chamber is further provided with a second through hole (not shown in the figure), and the second through hole is communicated with the outside air to replace the effect of a gap, so that high-temperature steam can be discharged better, and safety accidents such as explosion and the like caused by overlarge pressure in the second chamber are prevented.

Finally, with respect to the rotor 3, it is rotatably connected to the first chamber about the first axis 30 and is located between the inlet and outlet holes; the first shaft 30 is parallel to the intake direction; on the projection plane passing through the first shaft 30, the projection of the air inlet end of the rotor 3 is located in the projection of the second chamber, specifically, the rotor 3 stretches into the air passage 110, so that the temperature of the front end of the rotor 3 is ensured to be higher than the crystallization temperature of the compressed medium, the crystallization phenomenon of the compressed medium is avoided, and the operation reliability is improved; specifically, the rotor 3 is provided with a plurality of blades, and the outer circumferential profile formed by the rotation of the blades is matched with the inner wall surface of the second casing 11, so that the compression medium of the second casing 11 enters the impeller in the maximum range, thereby improving the compression efficiency.

In order to make the centrifugal compressor of the present embodiment have better thermal conductivity and improve the conduction efficiency, the first casing 10, the second casing 11, the third casing 12 and the separator 2 of the present embodiment are made of metal materials with good thermal conductivity, such as iron, aluminum alloy, steel, etc.

More preferably, the centrifugal compressor further comprises a spindle 4, a bearing 5, a nut 6 and a casing 7.

The mandrel 4 is arranged on the box body 7, and one end of the mandrel extends into the cavity for the rotor 3 to be sleeved; the mandrel 4 comprises a first mandrel 40 and a second mandrel 41; the first mandrel 40 is sleeved with the rotor 3; the first mandrel 40 and the second mandrel 41 are meshed for rotation; it will be appreciated that the first and second mandrels 40, 41 rotate coaxially with the first shaft 30; specifically, the diameter of the first mandrel 40 is smaller than that of the second mandrel 41, so that the rotation speed of the bearing 5 is lower than that of the rotor 3, and the bearing 5 is prevented from being worn out due to too high rotation speed, and then scrapped.

The bearing 5 is sleeved at the other end of the mandrel 4 and is positioned in the box 7; specifically, the bearing 5 is sleeved on the second mandrel 41; in order to achieve a better fixing effect, the bearing 5 and the second mandrel 41 are assembled in an interference fit manner; as shown in fig. 2, the two bearings 5 are arranged at intervals along the length direction of the second mandrel 41, and this design can improve the stability of the rotation of the second mandrel 41, so as to provide better supporting force for the rotation of the rotor 3, and make the rotation of the rotor 3 faster and more reliable.

The nut 6 is screwed to the spindle 4 and faces the rotor 3 in the air intake direction, and is used for fixing the rotor 3 and preventing the rotor 3 from being separated from the spindle 4 due to too high rotation speed during rotation.

The box body 7 is in a cuboid structure, and a containing cavity 70 is formed in the box body; the bearing 5 is assembled with the second spindle 41 and placed in the receiving chamber 70.

Working principle:

before the centrifugal compressor is started, high-temperature steam is introduced into the second chamber, so that the temperature of the second chamber rises, and meanwhile, as each element has heat conductivity, the temperature of the first chamber also rises along with the rise of the temperature of the second chamber, so that the temperature of the front end of the rotor 3 is higher than the crystallization temperature of a compression medium, the compression medium keeps the gas phase to be input into the rotor 3, the normal operation of the rotor 3 is maintained, and the service life is prolonged.

Principle of operation of compressed media:

the compressed medium enters the stator 1 through the air inlet channel 101, passes through the air outlet channel 110, is sucked by the rotor 3, is compressed, and is discharged from the air outlet channel 120.

Because the first chamber and the second chamber are separated by the separator 2, the steam in the second chamber can affect the first chamber, that is, the effect of temperature maintenance can affect the whole compression process, particularly, the steam is led in from the end plate 103, so that the front end of the rotor 3 is most obvious in temperature conduction effect, the compression medium is effectively prevented from crystallizing at the front end of the rotor 3, the centrifugal compressor is protected, the compression quality and quantity are improved, and the service life of the centrifugal compressor is prolonged.

Example two

Referring to fig. 3, an embodiment of the present application provides a centrifugal compressor, in which the number of first through holes 100 is 2; the first through holes 100 are uniformly circumferentially arranged in the first housing 10, and other technical features are the same as those of embodiment 1, and are not described herein. Due to the symmetrical arrangement of the 2 first through holes 100, the second chamber of the annular structure is heated uniformly, and the temperature is more stable.

Example III

Referring to fig. 4, an embodiment of the present application provides a centrifugal compressor, wherein the number of first through holes 100 is 4; the first through holes 100 are uniformly circumferentially arranged in the first housing 10, and other technical features are the same as those of embodiment 1, and are not described herein. Due to the array arrangement of the 4 first through holes 100, the second cavity of the annular structure is further heated uniformly, and the temperature is more stable.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

Although embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims (10)

1. A centrifugal compressor having a communication line, comprising:

a stator (1) provided with a cavity;

a separator (2) which is installed in the cavity and separates the cavity into a first chamber and a second chamber; the second chamber is communicated with the pipeline; the first chamber is provided with an air inlet hole and an air outlet hole;

a rotor (3) rotatably connected to the first chamber about a first axis (30) and located between the inlet and outlet holes; the first axis (30) is parallel to an intake direction; on a projection plane passing through the first axis (30), the projection of the air inlet end of the rotor (3) is located within the projection of the second chamber.

2. Centrifugal compressor according to claim 1, wherein the second chamber is provided with a first through hole (100); the first through hole (100) is communicated with the pipeline.

3. The centrifugal compressor according to claim 2, wherein the second chamber is further provided with a second through hole; the second through hole communicates with the outside air.

4. A centrifugal compressor according to claim 3, wherein the stator (1) comprises a first casing (10), a second casing (11) and a third casing (12) fixedly connected to each other; the first shell (10) is provided with the first through hole (100), and the first shell (10), the second shell (11) and the isolating piece (2) are enclosed to form the second cavity.

5. Centrifugal compressor according to claim 4, wherein the first housing (10) is provided with an air intake channel (101); the second shell (11) is provided with an air passage (110); the third shell (12) and the isolating piece (2) form an air outlet channel (120); -the inlet channel (101), the overgas channel (110) and the outlet channel (120) are in communication with each other to form the first chamber; the air outlet end of the air outlet channel (120) forms the air outlet hole; the air inlet end of the air inlet channel (101) forms the air inlet hole; the rotor (3) extends into the overgas channel (110).

6. Centrifugal compressor according to claim 5, wherein the first housing (10) is in sealing connection with the second housing (11); the second shell (11) is connected with the isolating piece (2) in a sealing way; the separator (2) is in sealing connection with the third housing (12).

7. The centrifugal compressor of claim 5, wherein the second chamber is of annular configuration.

8. The centrifugal compressor according to claim 7, wherein the number of first through holes (100) is 4; each first through hole (100) is uniform Zhou Sheyu to the first housing (10).

9. The centrifugal compressor according to any one of claims 1 to 8, further comprising a spindle (4), a bearing (5), a nut (6) and a casing (7); the mandrel (4) is arranged on the box body (7), and one end of the mandrel extends into the cavity to be sleeved by the rotor (3); the bearing (5) is sleeved at the other end of the mandrel (4) and is positioned in the box body (7); the nut (6) is in threaded connection with the mandrel (4) and faces the air inlet direction relative to the rotor (3).

10. Centrifugal compressor according to claim 9, wherein the spindle (4) comprises a first spindle (40) and a second spindle (41); the first mandrel (40) is sleeved with the rotor (3); the second mandrel (41) is sleeved with the bearing (5); the first mandrel (40) is meshed with the second mandrel (41) for rotation.

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