CN111365271A

CN111365271A - Compressor with compressor rotor braking function and control method thereof

Info

Publication number: CN111365271A
Application number: CN201811599535.XA
Authority: CN
Inventors: 刘华; 张治平; 蒋楠; 徐豪
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2018-12-26
Filing date: 2018-12-26
Publication date: 2020-07-03

Abstract

The present disclosure relates to a compressor and a control method thereof. The compressor includes: a housing; a compressor rotor (100) disposed within the housing; a braking structure (200) disposed within the housing; and the driving mechanism (300) is connected with the braking structure (200) and is used for driving the braking structure (200) to brake the compressor rotor (100). The embodiment of the disclosure can improve the service life of the supporting mechanism of the rotor.

Description

Compressor with compressor rotor braking function and control method thereof

Technical Field

The disclosure relates to the field of compressors, in particular to a compressor with a compressor rotor braking function and a control method thereof.

Background

The centrifugal compressor can increase the pressure, speed, temperature, and the like of gas by applying work to the gas by the impeller rotating at a high speed. In centrifugal compressors, the rotational speed of the impeller can be as high as several tens of thousands of revolutions per second, and correspondingly, the rotor rotational speed is also very high. When the compressor is powered off and stopped, the rotor cannot stop at a moment due to inertia, and a process of fast rotation and slow rotation is needed. The duration of this process will vary based on factors such as the weight and speed of the rotor.

In the related art, a centrifugal compressor uses a large number of oil-lubricated bearings, refrigerant-lubricated bearings, magnetic suspension bearings, or the like, and these bearings usually cannot work normally and effectively after the compressor is powered off. Therefore, the long-time inertial rotation of the rotor after power failure may cause damage to the bearings used in the compressor to some extent, affect the service life of the bearings used in the compressor, and in severe cases, directly cause the failure of the compressor.

Disclosure of Invention

In view of this, the embodiments of the present disclosure provide a compressor and a control method thereof, which can improve the life of a supporting mechanism of a rotor.

In one aspect of the present disclosure, there is provided a compressor including:

a housing;

a compressor rotor disposed within the housing;

a braking structure disposed within the housing; and

and the driving mechanism is connected with the braking structure and used for driving the braking structure to brake the compressor rotor.

In some embodiments, the braking structure comprises:

a clamping plate structure disposed radially outward of the compressor rotor.

In some embodiments, the plurality of the chucking structure is distributed along an axial direction of the compressor rotor.

In some embodiments, a circumferential surface roughness of a location on the compressor rotor corresponding to the cleat structure is higher than a circumferential surface roughness of the compressor rotor at other locations in the axial direction.

In some embodiments, the clamping plate structure comprises at least one clamping plate, and the at least one clamping plate is respectively connected with the driving mechanism and distributed along the circumferential direction of the compressor rotor.

In some embodiments, the drive mechanism comprises:

the piston cylinder is connected with the clamping plate structure; and

and the working medium supply mechanism is communicated with the inner cavity of the piston cylinder and is used for supplying a driving medium into the piston cylinder.

In some embodiments, the working medium supply mechanism comprises a hydraulic pump, an outlet of the hydraulic pump is communicated with an inner cavity of the piston cylinder through a conduit, and the hydraulic pump drives a cylinder rod of the piston cylinder to drive the clamp plate structure to move towards the compressor rotor and press the surface of the compressor rotor by introducing a liquid driving medium into the inner cavity of the piston cylinder.

In some embodiments, the piston cylinder includes a rod chamber and a rodless chamber separated by a first piston, the working medium supply mechanism includes a hydraulic pump and a hydraulic cylinder, the hydraulic cylinder includes a first hydraulic chamber and a second hydraulic chamber separated by a second piston, the hydraulic pump is communicated with the first hydraulic chamber, the second hydraulic chamber is communicated with the rodless chamber through a conduit, and the hydraulic pump drives the cylinder rod of the piston cylinder to drive the clamp plate structure to move towards the compressor rotor and press the surface of the compressor rotor by introducing a driving medium in a liquid state into the first hydraulic chamber.

In some embodiments, the drive medium comprises brake fluid.

In some embodiments, the brake fluid is a mixture of one or more of a castor oil-alcohol type brake fluid, a synthetic type brake fluid, and a mineral oil type brake fluid.

In some embodiments, the clamp plate structure includes a pair of clamp plates, and the pair of clamp plates are symmetrically disposed with respect to the compressor rotor.

In some embodiments, the material of the splint structure comprises one or a mixture of asbestos, semi-metal, or ceramic.

In some embodiments, the mating surface of the clamp plate structure and the compressor rotor is cylindrical.

In some embodiments, the compressor further comprises:

and the controller is in signal connection with the driving mechanism and is used for sending a control instruction to the driving mechanism when the compressor is powered off so as to control the driving mechanism to drive the braking structure to be close to and clamp the compressor rotor.

In some embodiments, the compressor is a centrifugal compressor.

In an aspect of the present disclosure, there is provided a control method based on the foregoing compressor, including:

and when the compressor is powered off, a control command is sent to the driving mechanism to control the driving mechanism to drive the braking structure to approach and clamp the compressor rotor.

Therefore, according to the embodiment of the disclosure, the driving mechanism drives the braking structure to brake the compressor rotor, so that the braking process of the compressor rotor can be actively realized through the driving mechanism under the condition that the compressor rotor needs to be decelerated or stopped to rotate, the damage of the rotor to the supporting mechanism caused by long-time inertial rotation is avoided, and the service life of the supporting mechanism of the rotor is prolonged.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.

The present disclosure may be more clearly understood from the following detailed description, taken with reference to the accompanying drawings, in which:

FIG. 1 is a block schematic diagram of some embodiments of a compressor according to the present disclosure;

FIG. 2 is a schematic structural diagram of some embodiments of a compressor according to the present disclosure;

FIG. 3 is a block schematic diagram of further embodiments of a compressor according to the present disclosure;

FIG. 4 is a schematic structural view of further embodiments of a compressor according to the present disclosure;

fig. 5 is a flow chart schematic of some embodiments of a control method of a compressor according to the present disclosure.

It should be understood that the dimensions of the various parts shown in the figures are not drawn to scale. Further, the same or similar reference numerals denote the same or similar components.

Detailed Description

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the disclosure, its application, or uses. The present disclosure may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, the composition of materials, and the like set forth in these embodiments are to be construed as illustrative only and not as limiting unless otherwise specifically stated.

The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element preceding the word covers the element listed after the word, and does not exclude the possibility that other elements are also covered. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

In the present disclosure, when a specific device is described as being located between a first device and a second device, there may or may not be intervening devices between the specific device and the first device or the second device. When a particular device is described as being coupled to other devices, that particular device may be directly coupled to the other devices without intervening devices or may be directly coupled to the other devices with intervening devices.

All terms (including technical or scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

As shown in fig. 1, is a block schematic diagram of some embodiments of a compressor according to the present disclosure. Referring to fig. 1, in some embodiments, a compressor includes: a housing, a compressor rotor 100, a braking structure 200, and a driving mechanism 300. A compressor rotor 100 is disposed within the housing. The compressor rotor 100 may be supported within the housing by bearings. The braking structure 200 is disposed in the housing and brakes the compressor rotor 100. The driving mechanism 300 is connected to the braking mechanism 200, and is used for driving the braking mechanism 200 to brake the compressor rotor 100.

In this embodiment, the driving mechanism drives the braking structure to brake the compressor rotor, so that the braking process of the compressor rotor can be actively realized through the driving mechanism under the condition that the compressor rotor needs to be decelerated or stopped to rotate, the damage of the rotor to the supporting mechanism caused by long-time inertial rotation is avoided, and the service life of the supporting mechanism of the rotor is further prolonged.

For example, when the compressor is de-energized, the compressor rotor continues to rotate under inertia, and in the absence of sufficient lubrication, the compressor rotor can cause damage to the bearings that support it. In this case, if the drive mechanism drives the brake mechanism to brake the compressor rotor, the rotation of the compressor rotor can be stopped as soon as possible, and damage to the bearing can be reduced. In addition to the compressor being powered off, the braking structure may also be driven by the driving mechanism to brake the compressor rotor if it is otherwise desired to stop the compressor rotor as soon as possible.

Referring to fig. 2 and 4, in some embodiments, the braking structure 200 includes a clamping plate structure disposed radially outward of the compressor rotor 100. This makes it possible to apply a pressing force to the circumferential outer surface of the compressor rotor 100 at the radially outer side of the compressor rotor 100 by the splint structure to form a large friction torque to reduce the rotation speed of the compressor rotor 100 until the rotation is stopped. Instead of using a clamping plate structure for braking, it is also possible to use a braking structure based on other forms or other principles, such as a cam structure or an electromagnet for braking the compressor rotor.

The splint structure can be provided with only one structure or a plurality of structures. For a brake structure 200 comprising a plurality of cleat structures, a plurality of the cleat structures may be distributed along the axial direction of the compressor rotor 100. For example, a plurality of clamping plate structures are provided at both ends of the compressor rotor 100, or at least one side of the compressor rotor 100 with respect to the bearing. The compressor rotor 100 is braked through a plurality of clamping plate structures, so that on one hand, a better braking effect can be realized, the braking reliability and the braking efficiency are improved, on the other hand, the braking torque received by the compressor rotor can be more balanced, and the overlarge local stress is avoided.

Referring to fig. 2 and 4, in some embodiments, the cleat structure may include at least one cleat. At least one clamping plate may be respectively coupled to the driving mechanism 300 and distributed along a circumferential direction of the compressor rotor 100. In order to make the pressing force applied to the compressor rotor by the clamping plate structure more uniform, the respective clamping plates may be uniformly distributed along the circumferential direction of the compressor rotor 100.

In some embodiments, the cleat structure may include a pair of cleats, such as the cleat structure shown in fig. 2 and 4 including two cleats,

cleats

210, 220, respectively. The pair of clamping plates may be symmetrically disposed with respect to the compressor rotor 100 so that the pressing force applied to the compressor rotor by the clamping plate structure is more uniform.

In order to prevent the braking structure 200 from causing great damage to the compressor rotor when the rotor is braked, and is not easy to wear so as to prevent impurities from being formed in the compressor, the material of the clamping plate structure preferably comprises one or a mixture of more than one of asbestos, semimetal or ceramic, so that the service life of the braking structure 200 can be prolonged and the reliability of the compressor can be improved while the braking requirement of the compressor rotor is met.

In order to form a larger contact area between the clamping plate structure and the compressor rotor 100 and achieve a better braking effect, the matching surface of the clamping plate structure and the compressor rotor 100 is preferably cylindrical so as to match the cylindrical outer contour of the compressor rotor 100. In addition, the roughness of the circumferential surface of the compressor rotor corresponding to the clamping plate structure can be higher than the roughness of other positions in the axial direction, so that the friction force between the clamping plate and the compressor rotor is increased.

As shown in fig. 3, a block schematic diagram of further embodiments of a compressor according to the present disclosure. Referring to fig. 3, in some embodiments, the compressor further includes a controller 400. The controller 400 is in signal connection with the driving mechanism 300, and is configured to send a control command to the driving mechanism 300 when the compressor is powered off, so as to control the driving mechanism 300 to drive the braking mechanism 200 to approach and clamp the compressor rotor 100. The controller 400 may also brake the compressor rotor 100 according to an operation of an operator on an operation panel or a remote controller.

Referring to fig. 2, in some embodiments, drive mechanism 300 includes a piston cylinder 310 and a working fluid supply mechanism 320. A piston cylinder 310 is connected to the clamp structure. For example, the clamping plate structure comprises at least one

clamping plate

210, 220, and the end of the cylinder rod 311 of the piston cylinder 310 can be fixedly connected with the clamping

plate

210, 220. The working medium supply mechanism 320 is communicated with the inner cavity of the piston cylinder 310 and is used for supplying driving media into the piston cylinder 310. The piston in the piston cylinder 310 can be pushed to move towards one side close to the compressor rotor 100 through the action of the driving medium, and the cylinder rod 311 and the clamping

plates

210 and 220 fixedly connected with the cylinder rod 311 are driven to also move towards one side close to the compressor rotor 100, so that the clamping

plates

210 and 220 are in contact with and press the circumferential surface of the compressor rotor 100, and the braking action of the compressor rotor 100 is further realized.

In fig. 2, working medium supply mechanism 320 may include a hydraulic pump 321. The outlet of the hydraulic pump 321 is communicated with the inner cavity of the piston cylinder 310 through a conduit 330, and the hydraulic pump 321 drives the cylinder rod 311 of the piston cylinder 310 to drive the clamp plate structure to move towards the compressor rotor 100 and press the surface of the compressor rotor 100 by introducing a liquid driving medium into the inner cavity of the piston cylinder 310. The incompressible property of the liquid driving medium is utilized to make the braking action of the compressor rotor more stable and reliable.

In other embodiments, referring to fig. 4, the piston cylinder 310 includes a rod cavity and a rod-less cavity separated by a first piston. The working fluid supply mechanism 320 may include a hydraulic pump 321 and a hydraulic cylinder 322. The hydraulic cylinder 322 includes a first hydraulic chamber and a second hydraulic chamber separated by a second piston, the hydraulic pump 321 being in communication with the first hydraulic chamber, and the second hydraulic chamber being in communication with the rodless chamber through a conduit 330. The hydraulic pump 321 drives the cylinder rod 311 of the piston cylinder 310 to drive the clamp plate structure to move towards the compressor rotor 100 and press the surface of the compressor rotor 100 by introducing a liquid driving medium into the first hydraulic cavity.

In the above embodiment, the driving medium includes the brake fluid. In other embodiments, the driving medium may also be a gas driving medium such as air or inert gas, or a liquid brake fluid such as water or hydraulic oil. In order to achieve a better braking effect, brake fluid with good viscosity-temperature property, low freezing point and good low-temperature fluidity can be adopted, the brake fluid has high boiling point and does not generate air resistance at high temperature, and in addition, the quality change is small in the using process, and the corrosion and the deterioration of metal parts, rubber parts and the like are not caused. Accordingly, the brake fluid is preferably a mixture of one or more of a castor oil-alcohol type brake fluid, a synthetic type brake fluid and a mineral oil type brake fluid to improve the reliability of the braking effect.

In the above embodiment, the compressor is preferably a centrifugal compressor provided with a high-speed rotor inside a casing. The compressor may also be another type of compressor that includes a compressor rotor.

Based on the embodiments of the compressor, the embodiment of the present disclosure further provides a control method based on any one of the embodiments of the compressor. Referring to fig. 5, in some embodiments, a control method of a compressor includes: when the compressor is powered off, a control command is sent to the driving mechanism 300 to control the driving mechanism 300 to drive the braking mechanism 200 to approach and clamp the compressor rotor 100.

In the present specification, a plurality of embodiments are described in a progressive manner, the emphasis of each embodiment is different, and the same or similar parts between the embodiments are referred to each other. For the method embodiment, since the whole and related steps have corresponding relations with the contents in the system embodiment, the description is relatively simple, and the relevant points can be referred to the partial description of the system embodiment.

Thus, various embodiments of the present disclosure have been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.

Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that various changes may be made in the above embodiments or equivalents may be substituted for elements thereof without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A compressor, comprising:

a housing;

a compressor rotor (100) disposed within the housing;

a braking structure (200) disposed within the housing; and

and the driving mechanism (300) is connected with the braking structure (200) and is used for driving the braking structure (200) to brake the compressor rotor (100).

2. The compressor of claim 1, wherein the braking structure (200) comprises:

a splint structure disposed radially outward of the compressor rotor (100).

3. Compressor according to claim 2, characterized in that said structure of cleats is plural, said plural structures of cleats being distributed along the axial direction of said compressor rotor (100).

4. The compressor of claim 2, wherein a circumferential surface roughness of a location on the compressor rotor (100) corresponding to the splint structure is higher than a circumferential surface roughness of the compressor rotor (100) at other locations in the axial direction.

5. The compressor of claim 2, wherein the clamping plate structure comprises at least one clamping plate (210, 220), the at least one clamping plate (210, 220) being connected to the driving mechanism (300) and distributed along a circumferential direction of the compressor rotor (100), respectively.

6. The compressor of claim 2, wherein the drive mechanism (300) comprises:

a piston cylinder (310) connected with the clamp plate structure; and

the working medium supply mechanism (320) is communicated with the inner cavity of the piston cylinder (310) and is used for supplying driving media into the piston cylinder (310).

7. The compressor according to claim 6, characterized in that the working medium supply mechanism (320) comprises a hydraulic pump (321), an outlet of the hydraulic pump (321) is communicated with an inner cavity of the piston cylinder (310) through a conduit (330), and the hydraulic pump (321) drives a cylinder rod (311) of the piston cylinder (310) to drive the clamping plate structure to move towards the compressor rotor (100) and press the surface of the compressor rotor (100) by introducing a driving medium in a liquid state into the inner cavity of the piston cylinder (310).

8. The compressor of claim 6, wherein the piston cylinder (310) comprises a rod chamber and a rodless chamber separated by a first piston, the working medium supply mechanism (320) comprises a hydraulic pump (321) and a hydraulic cylinder (322), the hydraulic cylinder (322) comprises a first hydraulic chamber and a second hydraulic chamber separated by a second piston, the hydraulic pump (321) is communicated with the first hydraulic chamber, the second hydraulic chamber is communicated with the rodless chamber through a conduit (330), and the hydraulic pump (321) drives the cylinder rod (311) of the piston cylinder (310) to move the clamp plate structure towards the compressor rotor (100) and to press the surface of the compressor rotor (100) by introducing a driving medium in a liquid state into the first hydraulic chamber.

9. The compressor of claim 6, wherein the drive medium comprises brake fluid.

10. The compressor of claim 9, wherein the brake fluid is a mixture of one or more of a castor oil-alcohol type brake fluid, a synthetic type brake fluid, and a mineral oil type brake fluid.

11. The compressor of claim 2, wherein the clamping plate structure comprises a pair of clamping plates (210, 220), and the pair of clamping plates (210, 220) are symmetrically arranged with respect to the compressor rotor (100).

12. The compressor of claim 2, wherein the material of the clamp plate structure comprises one or a mixture of materials selected from asbestos, semi-metal, or ceramic.

13. Compressor according to claim 2, characterized in that the mating surface of the clamping plate structure with the compressor rotor (100) is cylindrical.

14. The compressor of claim 1, further comprising:

and the controller (400) is in signal connection with the driving mechanism (300) and is used for sending a control command to the driving mechanism (300) when the compressor is powered off so as to control the driving mechanism (300) to drive the braking structure (200) to approach and clamp the compressor rotor (100).

15. The compressor of claim 1, wherein the compressor is a centrifugal compressor.

16. A method for controlling a compressor according to any one of claims 1 to 15, comprising:

when the compressor is powered off, a control command is sent to the driving mechanism (300) to control the driving mechanism (300) to drive the braking structure (200) to approach and clamp the compressor rotor (100).