CN209959571U

CN209959571U - Air inlet anti-surge pipe of MVR centrifugal type vapor compressor

Info

Publication number: CN209959571U
Application number: CN201920870330.4U
Authority: CN
Inventors: 刘雅黔; 周余; 曾延年; 杨建川; 李晓春; 王纯远
Original assignee: Chongqing Turbo Flow Machinery Manufacturing Co Ltd
Current assignee: Chongqing Turbo Flow Machinery Manufacturing Co Ltd
Priority date: 2019-06-11
Filing date: 2019-06-11
Publication date: 2020-01-17
Anticipated expiration: 2029-06-11

Abstract

The utility model relates to a centrifugal vapor compressor technical field of MVR, a centrifugal vapor compressor of MVR advances anti-asthmatic pipe is disclosed, including drawing the inflator, first bleed pipe, first flange and second flange, first bleed pipe and bleed cylinder intercommunication, first bleed pipe connects compressor gas vent steam, still include the inner tube, guide plate and whirl board, the inner tube is located inside the bleed cylinder, the cavity one end that forms between inner tube and the bleed cylinder is sealed by first flange, the other end is connected with the whirl board, the guide plate is fixed between inner tube and bleed cylinder, and the guide plate is located between first bleed pipe and the whirl board, be equipped with a plurality of water conservancy diversion holes on the guide plate, be equipped with a plurality of whirl holes that can the rotating air current on the whirl board. Under the condition of introducing the steam at the exhaust port of the compressor, the scheme utilizes the specially designed inner barrel, the guide plate and the spiral-flow plate to rotate the introduced steam airflow, thereby changing the direction angle of the airflow entering the compressor and achieving the purpose of preventing and eliminating the surge of the compressor.

Description

Air inlet anti-surge pipe of MVR centrifugal type vapor compressor

Technical Field

The utility model relates to a centrifugal vapor compressor technical field of MVR specifically is a centrifugal vapor compressor of MVR pipe of preventing breathing freely that admits air.

Background

Surge of MVR centrifugal vapor compressors is its inherent phenomenon. The compressor has serious aftereffect when surging, which can deteriorate the performance of the compressor, obviously reduce the pressure and the efficiency, generate noise and sudden sound, and have violent vibration, and when the compressor is serious, the rotor can collide with a fixed part to damage the machine. The mechanism of surge is that the compressor is in operation with an actual flow less than the surge flow.

Therefore, to avoid or reduce surge during start-up or operation of the compressor, it is common in compressor design to introduce compressor discharge gas directly into the intake such that the compressor inlet flow is increased to greater than the surge flow; or the rotatable guide vanes are adopted to lead the airflow to generate prerotation, and the direction of the airflow entering the impeller is changed to reduce the attack angle of the airflow at the inlet side of the impeller vanes, thereby preventing or eliminating the surging of the compressor.

The gas at the outlet of the compressor is directly introduced into the gas inlet, so that the flow of the gas at the inlet of the compressor is increased, the structure is simple, the turbulence degree of the gas flow at the inlet of the compressor can be increased, the efficiency of the compressor is reduced, the power consumption of the compressor is increased, and the energy is not saved. Such surge prevention structures are widely adopted in the industry because of low cost. The use of rotatable guide vanes (rotatable guide vanes) is complicated and expensive to manufacture.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a centrifugal vapor compressor of MVR admits air anti-surge pipe to solve the problem that proposes in the above-mentioned background art.

In order to achieve the above object, the basic scheme of the present invention is as follows:

an air inlet anti-surge pipe of an MVR centrifugal vapor compressor comprises an air introducing cylinder, a first air introducing pipe, a first flange and a second flange, the first flange and the second flange are respectively positioned at two ends of the air entraining cylinder, the first air entraining pipe is communicated with the air entraining cylinder, the first bleed pipe is connected with the steam at the exhaust port of the compressor and also comprises an inner cylinder, a guide plate and a rotational flow plate, the inner cylinder is positioned in the air entraining cylinder and is coaxial with the air entraining cylinder, one end of a cavity formed between the inner cylinder and the air entraining cylinder is sealed by a first flange, the other end of the cavity is connected with the rotational flow plate, the guide plate is fixed between the inner cylinder and the air entraining cylinder, the guide plate is positioned between the first air guide pipe and the rotational flow plate, a plurality of guide holes are arranged on the guide plate, the cyclone plate is provided with a plurality of cyclone holes capable of rotating airflow, and the airflow rotating direction passing through the cyclone holes is the same as the impeller rotating direction of the MVR centrifugal vapor compressor.

The beneficial effects of the basic scheme are as follows: (1) under the condition of introducing the steam at the exhaust port of the compressor, the scheme utilizes the specially designed inner barrel, the guide plate and the spiral-flow plate to rotate the introduced steam airflow, thereby changing the direction angle of the airflow entering the compressor and achieving the purpose of preventing and eliminating the surge of the compressor.

(2) This patent is compared with the current mode of directly introducing the air inlet with compressor outlet gas, and better anti-surge effect can be reached under the condition of the same import air current to this scheme, all has obvious improvement to the increase of the turbulent degree that the compressor import air current leads to, the reduction of compressor efficiency, the increase scheduling problem of compressor consumption.

(3) This patent makes the air current produce the mode of prewhirling with current rotatable guide vane of adoption and compares, and this scheme need not use pivoted guide vane, has reduced manufacturing cost, and can satisfy the anti-surge demand of the compressor of different models through swirl hole quantity, shape etc. that change on the whirl board, has simplified the structure of compressor anti-surge mechanism, has reduced the sealed requirement of compressor system.

Furthermore, still be communicated with the second bleed air pipe on the bleed cylinder, the outer steam that supplies of second bleed air pipe joint, the second bleed air pipe is located the positive opposite face of first bleed air pipe. The steam can be supplied to the outside, the flow of the steam is improved, the speed of the airflow is improved, and when the compressor is started or stopped, the airflow rotating speed is adjusted by adjusting the flow of the second air-entraining pipe, so that the direction angle of the airflow entering the impeller is changed, and the compressor is prevented from surging.

The cyclone cylinder is a conical cylinder body, one end with the larger diameter of the cyclone cylinder is fixedly connected with the air entraining cylinder, and the other end of the cyclone cylinder is fixedly connected with the second flange. The rotating airflow entering the cyclone cylinder from the cyclone plate drives the airflow entering the inner cylinder to rotate, and the rotating airflow is provided for the air compressing impeller, so that a better anti-surge effect is achieved.

Furthermore, the swirl holes in the swirl plate are inclined through holes. The air flow passing through the guide plate enters the through holes inclined on the rotary flow plate and rotates and flows at the inclined angle of the through holes, so that the pre-rotation of the air flow is realized.

Further, the swirl holes in the swirl plate are nozzle blade type passages. The nozzle blade type channel is used for pre-rotating the air flow, and compared with the inclined through hole, the pre-rotating effect of the nozzle blade type channel on the air flow is better.

Furthermore, the swirl holes are uniformly distributed on the swirl plate. The even distribution of whirl hole can realize better air current prewhirl effect.

Furthermore, a plurality of axial annular grooves are formed in the end portion of the second flange. In operation, the second flange is connected with the compressor, and the axial annular groove can form a sealing channel, so that the sealing effect after the scheme is connected with the compressor is improved.

Drawings

Fig. 1 is a schematic overall structure diagram of a first embodiment of the present invention;

fig. 2 is a cross-sectional view of a first embodiment of the present invention;

fig. 3 is a front view of a deflector according to a first embodiment of the present invention;

fig. 4 is a sectional view of a deflector according to a first embodiment of the present invention;

fig. 5 is a front view of a vortex plate according to an embodiment of the present invention;

FIG. 6 is a side sectional view of a swirler plate according to an embodiment of the present invention;

fig. 7 is a front view of a vortex plate according to a second embodiment of the present invention;

fig. 8 is a side sectional view of a second embodiment of the present invention.

Detailed Description

The following is further detailed by way of specific embodiments:

reference numerals in the drawings of the specification include: the device comprises an air guide cylinder 1, a first air guide pipe 2, a second air guide pipe 3, a first flange 4, a second flange 5, a cyclone cylinder 6, an inner cylinder 7, a guide plate 8, a cyclone plate 9, a guide hole 10, a cyclone hole 11 and an axial annular groove 12.

Example one

Substantially as shown in the attached figures 1 and 2: MVR centrifugal vapor compressor prevents breathing freely pipe that shakes of admitting air, including air entrainment cylinder 1, first air entrainment pipe 2, second air entrainment pipe 3, first flange 4, second flange 5, a whirl section of thick bamboo 6, inner tube 7, guide plate 8 and whirl board 9, first air entrainment pipe 2, second air entrainment pipe 3 all communicate with air entrainment cylinder 1, first air entrainment pipe 2 connects compressor gas vent steam, second air entrainment pipe 3 connects outer confession steam, second air entrainment pipe 3 is located first air entrainment pipe 2 just opposite face. The inner cylinder 7 is positioned in the air introducing cylinder 1 and is coaxial with the air introducing cylinder 1, one end of a cavity formed between the inner cylinder 7 and the air introducing cylinder 1 is sealed by the first flange 4, the other end of the cavity is connected with the rotational flow plate 9, and the inner cylinder 7 is a main air inlet channel. The guide plate 8 is fixed between inner tube 7 and air entraining tube 1, and the guide plate 8 is located between first air entraining pipe 2 and the whirl board 9 and is parallel with whirl board 9, combines fig. 3, fig. 4 to show, is equipped with a plurality of evenly distributed's water conservancy diversion hole 10 on the guide plate 8, combines fig. 5, fig. 6 to show, is equipped with a plurality of evenly distributed's whirl hole 11 that can rotatory air current on the whirl board 9, and whirl hole 11 is the through-hole of slope, process the air current direction of rotation of whirl hole 11 is the same with the impeller direction of rotation of the centrifugal vapor compressor of MVR. The cyclone cylinder 6 is a conical cylinder body, one end with larger diameter of the cyclone cylinder 6 is fixedly connected with the gas introducing cylinder 1, the other end of the cyclone cylinder 6 is fixedly connected with the second flange 5, and the end part of the second flange 5 is provided with a plurality of axial annular grooves 12.

The specific implementation process is as follows: when the compressor is started, firstly, the first air guide pipe 2 and the second air guide pipe 3 are appropriately and simultaneously opened, part of steam and externally supplied steam at the air outlet of the compressor are introduced into the air inlet anti-surge pipe, and the steam flows through the rotational flow plates 9 uniformly distributed with inclined through holes after being decompressed through the flow guide holes 10 uniformly distributed on the flow guide plate 8 in the air inlet anti-surge pipe, so that the flowing direction is changed, and the rotational air flow is formed. And then starting the compressor at a constant speed, and when the compressor surges, independently adjusting the steam flow of the first bleed air pipe 2 or the second bleed air pipe 3 or simultaneously adjusting the steam flow of the two bleed air pipes to change the direction angle of the pre-swirl airflow entering the impeller and eliminate the surge of the compressor in the starting process.

After the compressor is started, the externally supplied steam is closed, and the steam led from the exhaust port of the compressor is regulated or closed under the condition of ensuring that no surging occurs. When surging occurs in the running process of the compressor, the flow of steam led from an exhaust port of the compressor is adjusted, the direction angle of pre-rotation airflow entering the impeller is changed, and surging is eliminated. When the compressor is stopped, the external steam supply is started first, and the compressor is gradually decelerated until the compressor is stopped. The steam flow of the first bleed air pipe 2 or the second bleed air pipe 3 is independently adjusted or the steam flow of the two bleed air pipes is simultaneously adjusted, so that the surge of the compressor in the shutdown process is eliminated.

Example two

The present embodiment differs from the first embodiment only in that: the swirl holes 11 of the swirl plate 9 shown in fig. 7 and 8 are nozzle blade type passages.

The foregoing is merely an example of the present invention and common general knowledge in the art of known specific structures and/or features has not been set forth herein in any greater detail. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.

Claims

The air inlet anti-surge pipe of the MVR centrifugal vapor compressor comprises an air introducing cylinder, a first air introducing pipe, a first flange and a second flange, wherein the first flange and the second flange are respectively positioned at two ends of the air introducing cylinder, the first air introducing pipe is communicated with the air introducing cylinder, and the first air introducing pipe is connected with steam at an air outlet of the compressor and is characterized in that: still include inner tube, guide plate and whirl board, the inner tube is located the air entrainment section of thick bamboo inside and coaxial with the air entrainment section of thick bamboo, the cavity one end that forms between inner tube and the air entrainment section of thick bamboo is sealed by first flange, and the other end is connected with the whirl board, the guide plate is fixed between inner tube and air entrainment section of thick bamboo, just the guide plate is located between first bleed pipe and the whirl board, be equipped with a plurality of water conservancy diversion holes on the guide plate, be equipped with a plurality of whirl holes that can rotatory air current on the whirl board, process the air current direction of rotation in whirl hole is the same with MVR centrifugal vapor compressor's impeller direction of rotation.
2. The MVR centrifugal vapor compressor air intake surge arrestor tube of claim 1, wherein: the air introducing cylinder is also communicated with a second air introducing pipe, the second air introducing pipe is connected with external steam, and the second air introducing pipe is positioned right opposite to the first air introducing pipe.
3. The MVR centrifugal vapor compressor air intake surge arrestor tube of claim 2, wherein: the cyclone separator further comprises a cyclone cylinder, the cyclone cylinder is a conical cylinder body, one end with the larger diameter of the cyclone cylinder is fixedly connected with the air entraining cylinder, and the other end of the cyclone cylinder is fixedly connected with the second flange.
4. The MVR centrifugal vapor compressor air intake surge arrestor tube of claim 3, wherein: and the swirl holes on the swirl plate are inclined through holes.
5. The MVR centrifugal vapor compressor air intake surge arrestor tube of claim 3, wherein: the swirl holes on the swirl plate are nozzle blade type channels.
6. The MVR centrifugal vapor compressor air intake surge arrestor tube of claim 4 or 5, wherein: the swirl holes are uniformly distributed on the swirl plate.
7. The MVR centrifugal vapor compressor air intake surge arrestor tube of claim 6, wherein: and a plurality of axial annular grooves are formed in the end part of the second flange.