阅读说明：本技术 一种罗茨式mvr蒸汽压缩机 (Roots formula MVR vapor compressor ) 是由 扈奎 翟荣芝 牛余会 牛联刚 于 2019-11-22 设计创作，主要内容包括：本发明公开了一种罗茨式MVR蒸汽压缩机,主要涉及压缩设备技术领域,包括机壳,在所述机壳两端设有端盖,主轴贯穿密封的端盖连接到两端的轴承架上,在所述主轴上设有叶轮,在机壳上部通过进气箱式容积连接进气口、底部设有箱式容积支撑,在箱式容积支撑一端连接出气口、另一端通过箱式管路连接到进气箱式容积,在端盖顶部开孔并通过端盖管路连接端盖管路,端盖管路连接到进气箱式容积,在端盖底部设有端盖排污管,在叶轮上设有去重孔,并在叶轮的最高点均匀排布导热孔,导热孔连通去重孔,解决不采用机械密封时的泄露问题,解决因机组启停导致温度剧烈变化产生的叶轮损坏问题,并集成了压缩机进气、排气的系统布局。(The invention discloses a Roots type MVR vapor compressor, which mainly relates to the technical field of compression equipment and comprises a shell, wherein end covers are arranged at two ends of the shell, a main shaft penetrates through the sealed end covers and is connected to bearing frames at the two ends, an impeller is arranged on the main shaft, the upper part of the shell is connected with an air inlet through an air inlet box type volume, a box type volume support is arranged at the bottom, one end of the box type volume support is connected with an air outlet, the other end of the box type volume support is connected to the air inlet box type volume through a box type pipeline, the top of the end cover is provided with a hole and is connected with an end cover pipeline, the end cover pipeline is connected with the air inlet box type volume, an end cover blow-off pipe is arranged at the bottom of the end cover, a weight removing hole is arranged on the impeller, heat conducting holes are uniformly distributed at the highest point of, and the system layout of air inlet and air outlet of the compressor is integrated.)

1. A roots type MVR vapor compressor is characterized in that: comprises a casing (1), end covers (2) are arranged at two ends of the casing (1), a main shaft (4) penetrates through the sealed end covers (2) and is connected to bearing frames (3) at two ends, an impeller (5) is arranged on the main shaft (4), the upper part of the casing (1) is connected with an air inlet (7) through an air inlet box type volume (6), a box type volume support (8) is arranged at the bottom, one end of the box type volume support (8) is connected with an air outlet (9), the other end of the box type volume support is connected to the air inlet box type volume (6) through a box type pipeline (11), the top of the end cover (2) is provided with a hole and is connected with an end cover pipeline (13) through the end cover pipeline (5), the end cover pipeline (13) is connected to the air inlet box type volume (6), an end cover blow-off pipe (14) is arranged at the bottom of the end cover (2), the heat conduction hole (16) is communicated with the weight removing hole (15).

2. The roots-type MVR vapor compressor of claim 1, wherein: a box-type sewage draining pipe (10) is arranged at the bottom of the upper side surface of the box-type volume support (7).

3. The roots-type MVR vapor compressor of claim 1, wherein: a butterfly valve (12) is arranged on the pipeline (11).

4. The roots-type MVR vapor compressor of claim 1, wherein: the air inlet box type volume (6) and the box type volume support (8) are internally provided with certain volumes and can play a role in air inlet buffering and exhaust buffering.

5. The roots-type MVR vapor compressor of claim 1, wherein: the box-type pipeline (11) is arranged on the opposite side of the air outlet (9), and the opening size of the box-type pipeline (11) is equal to that of the air outlet (9).

6. The roots-type MVR vapor compressor of claim 1, wherein: the weight-removing hole (15) is narrow at two ends and wide in the middle.

Technical Field

The invention mainly relates to the technical field of compression equipment, in particular to a Roots type MVR vapor compressor.

Background

The MVR is a short term for a mechanical vapor recompression (mechanical vapor recompression) technology, and is a vapor heat source for raising low-grade vapor into high-grade vapor by mechanical work of a compressor by using secondary vapor and energy thereof generated by an evaporation system. The circulation provides heat energy for the evaporation system, thereby reducing the requirement on external energy.

In recent years, the MVR technology has become an energy-saving and emission-reducing technology widely popularized and used in evaporation concentration links of various industries such as food processing industry, chemical industry, salt manufacturing industry and the like, the existing mature roots type MVR vapor compressor equipment comprises a casing, end covers are arranged at two ends of the casing, a main shaft penetrates through the end covers and is connected to bearing frames at two ends, impellers are arranged on the main shaft, an air inlet is arranged at the upper part of the casing, the bottom of the casing is connected with an air outlet pipeline through a rib type support, an air outlet is arranged on the air outlet pipeline, a blow-off pipe is arranged on the air outlet pipeline, the rib type support is arranged at the bottom of the casing, the specific structure is not illustrated, the existing mature technology is adopted, the VR vapor compressor forms the own standard, but in the existing production, the phenomenon of strong surging of the compressor is frequently caused by unstable system flow when, when the surge phenomenon occurs, the ultrahigh vibration can cause serious damage to the structural strength of the unit, a bearing and the like; because the cost factor or the working condition is not allowed, when mechanical sealing is not adopted, the sealing is not strict, steam can leak to an oil tank through a wall plate, and lubricating oil is polluted and deteriorated, so that the service life of a bearing and a gear is directly reduced, and even the bearing and the gear are directly damaged; during operation, the conveying medium is high-temperature steam. When high-temperature steam instantly fully distributed in a compressor cavity contacts a rotor integrally cast, the rotor can generate inconsistent thermal expansion due to nonuniform heating, and the rotor can generate fine cracks after being stopped and started for many times, so that the service life of the compressor is influenced.

Disclosure of Invention

In view of the defects in the prior art, the invention provides a Roots type MVR vapor compressor, which solves the problem of leakage when mechanical seal is not adopted, solves the problem of impeller damage caused by severe temperature change due to the start and stop of a unit, and integrates the system layout of air inlet and exhaust of the compressor.

In order to solve the technical problems, the invention adopts the following technical scheme: a roots type MVR vapor compressor is characterized in that: including the casing both ends are equipped with the end cover, and the main shaft runs through on sealed end cover is connected to the bearing bracket at both ends be equipped with the impeller on the main shaft, connect the air inlet through the box volume of admitting air on casing upper portion, the bottom is equipped with box volume and supports, support one end at box volume and connect the gas outlet, the other end is connected to the box volume of admitting air through box pipe connection, trompil and connect the end cover pipeline through the end cover pipeline at the end cover top, the end cover pipe connection is to the box volume of admitting air, be equipped with the end cover blow off pipe bottom the end cover, be equipped with the heavy hole of going on the impeller to heat conduction hole is evenly arranged at the peak of the.

As a further improvement of the invention, a box type sewage draining pipe is arranged at the bottom of the upper side surface of the box type volume support.

As a further improvement of the invention, a butterfly valve is arranged on the pipeline.

As a further improvement of the invention, the air inlet box type volume and the box type volume support have certain volume inside and can play the roles of air inlet buffering and air exhaust buffering.

As a further improvement of the invention, the box-type pipeline is arranged on the opposite side of the air outlet, and the opening size of the box-type pipeline is equal to that of the air outlet.

As a further improvement of the invention, the weight-removing hole has a shape with two narrow ends and a wide middle part.

Compared with the prior art, the invention has the beneficial effects that:

1. the integration level is high, and a buffer tank for air inlet and exhaust is not required to be arranged in a closed way of the system;

2. the exhaust port can supplement gas to the air inlet, so that surge of the fan caused by insufficient inlet flow is avoided;

3. gas leakage is effectively reduced;

4. the weight of the impeller is reduced, the cost is reduced, and the production and the processing are convenient;

5. the damage of the impeller caused by large temperature change is solved.

Drawings

The invention will be further described with reference to the following drawings and detailed description:

FIG. 1 is a schematic view of a Roots-type MVR vapor compressor according to the present invention;

FIG. 2 is a perspective view of the impeller of the present invention;

FIG. 3 is a cross-sectional view of an impeller of the present invention;

in the figure: the device comprises a shell 1, end covers 2, a bearing frame 3, a main shaft 4, an impeller 5, an air inlet box type volume 6, an air inlet 7, a box type volume support 8, an air outlet 9, a box type sewage discharge pipe 10, a box type pipeline 11, a butterfly valve 12, an end cover pipeline 13, an end cover sewage discharge pipe 14, a weight removing hole 15, a heat conducting hole 16, 17, 18, 19 and 20.

Detailed Description

For better understanding of the technical solutions and advantages of the present invention, the following detailed description of the present invention is provided with specific embodiments, it should be understood that the specific embodiments described herein are only for understanding the present invention and are not intended to limit the present invention, and all other embodiments obtained by those of ordinary skill in the art without creative efforts will fall within the protection scope of the present invention.

Fig. 1 is a schematic structural diagram of a roots-type MVR vapor compressor of the present invention, which includes a casing 1, wherein end caps 2 are disposed at two ends of the casing 1, a main shaft 4 penetrates through the sealed end caps 2 and is connected to bearing frames 3 at two ends, an impeller 5 is disposed on the main shaft 4, an air inlet 7 is connected to the upper portion of the casing 1 through an air inlet box-type volume 6, a box-type volume support 8 is disposed at the bottom, an air outlet 9 is connected to one end of the box-type volume support 8, the other end of the box-type volume is connected to the air inlet box-type volume 6 through a box-type pipeline 11, a hole is opened at the top of the end cap 2 and is connected to an end cap pipeline 13 through the end cap pipeline 5, the end cap pipeline 13 is connected to the air inlet box-type volume 6.

FIG. 2 is a schematic structural view of an impeller according to the present invention; the impeller 5 is provided with the weight-removing holes 15, the heat-conducting holes 16 are uniformly distributed at the highest point of the impeller 5, the heat-conducting holes 16 are communicated with the weight-removing holes 15, and the weight-removing holes 15 are narrow at two ends and wide in the middle.

The shell cavity lower rib type support is changed into a box type volume support 8 structure, the air inlet flange type is changed into an air inlet box type volume 6, an opening with the same size as an air outlet is formed in the opposite side of the air outlet 9 on the box type volume support at the bottom of the shell, the box type volume support is connected to the air inlet box type volume 6 through a box type pipeline 11, a butterfly valve 12 is arranged in the center of the pipeline, when the flow of a steam compressor system is unstable, the butterfly valve 12 is opened to the proper size, exhaust media can be formed to flow back to the air inlet box type volume 6, the insufficient flow of. And the air inlet box type volume 6 and the box type volume support 8 can perform air inlet buffering and exhaust buffering functions, an air inlet buffer tank is not required to be arranged in front of the compressor like a conventional machine type, and an exhaust buffer tank is not required to be arranged at the rear of the compressor, so that the occupied area of the system is saved, and parts required by the system are reduced.

A connecting hole is processed above the end cover 2, an end cover pipeline 23 is installed, the air inlet box type volume 6 is connected with the two end covers 2 through the end cover pipeline 23, when media leak to the end covers 2, the media are sucked into the air inlet box type volume 6 again through the end cover pipeline 23, and the circulation is carried out, so that the leakage of the conveying gas is effectively prevented. Meanwhile, an end cover blow-off pipe 14 is arranged below the wallboard, accumulated water condensed by steam can be drained by the aid of the end cover blow-off pipe, and gas leakage is effectively reduced.

The impeller 5 is provided with the weight-removing holes 15, the weight of the impeller is reduced, the cost is reduced, the production and the processing are convenient, the heat-conducting holes 16 are uniformly distributed at the highest point of the impeller 5, and the heat-conducting holes 16 guide steam to the weight-removing holes 15, so that the impeller 5 is heated uniformly, the impeller 5 is protected from being damaged due to too large temperature difference change during starting and stopping, and the damage of the impeller due to large temperature change is solved.

It is noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.