Combined sealing structure of mechanical vapor recompression (MVR) centrifugal vapor compressor

Abstract

The utility model discloses an MVR centrifugal vapor compressor combined type sealing structure which comprises a rotating shaft, the side surface of the rotating shaft is fixedly connected with a shaft sleeve, the side surface of the shaft sleeve is rotatably connected with a mounting plate, the side surface of the mounting plate is fixedly connected with a sealing ring, the side inner wall of the mounting plate is in threaded connection with a positioning cylinder, and the positioning cylinder is in threaded connection with the rotating shaft. Positioning threads are fixedly connected to the inner side face of the positioning cylinder, an air inlet pipe is fixedly connected to the side surface of the mounting plate, a ventilation channel is formed in the mounting plate, a fixing ring is fixedly connected to the side inner wall of the mounting plate, and a piston is slidably connected to the side inner wall of the fixing ring; the end, close to the fixing ring, of the piston is fixedly connected with an extrusion ring. Through the components, the positioning threads on the positioning cylinder and high-pressure steam enter the ventilation channel to push the piston and the extrusion ring, the shaft sleeve is extruded from the two sides, the gap between the shaft sleeve and the rotating shaft is reduced, and therefore the sealing effect of the inner side of the shaft sleeve and the rotating shaft is improved.

Description

Technical Field

[0001] This utility model relates to the field of sealing structure technology, and in particular to a combined sealing structure for an MVR centrifugal steam compressor. Background Technology

[0002] In the operation of an MVR centrifugal steam compressor, the sealing performance between the shaft and the bushing is a key factor affecting the equipment's efficiency and stability. However, existing sealing structures for this part have many shortcomings: traditional sealing methods often struggle to effectively control the gap between the bushing and the shaft. Due to the lack of a design that uses locating threads to compress the bushing, the fit between the bushing and the shaft is poor, easily leading to excessive gaps and unsatisfactory sealing. Furthermore, most existing sealing structures do not utilize the high-pressure steam generated during equipment operation to enhance sealing performance. They lack a mechanism for introducing high-pressure steam through a venting channel and driving a piston to dynamically compress the bushing with a compression ring, making it difficult to achieve a continuous and tight fit between the bushing and the shaft. In addition, traditional sealing designs often employ a single fixing or compression method, lacking a dual compression structure formed by cooperating with a fixed cylinder. This prevents further improvement in sealing performance through multiple actions. In a high-pressure steam environment, insufficient sealing performance can easily lead to steam leakage, reducing compressor efficiency and potentially causing energy waste and operational hazards. Utility Model Content

[0003] The purpose of this utility model is to at least solve one of the technical problems existing in the prior art, and to provide a combined sealing structure for an MVR centrifugal steam compressor. By installing a set of positioning cylinders on the mounting plate, the positioning threads on the inner side of the positioning cylinders are used to compress the bushing, reducing the gap between the bushing and the rotating shaft, thereby improving the sealing effect between the inner side of the bushing and the rotating shaft. High-pressure steam is introduced into the ventilation channel to push the piston and cause the compression ring to compress the bushing, which also makes the bushing and the rotating shaft fit more tightly. Through the double compression effect of the fixed cylinder, the sealing performance between the rotating shaft and the bushing is further improved.

[0004] This utility model also provides a combined sealing structure for an MVR centrifugal steam compressor, comprising: a rotating shaft, a bushing fixedly connected to the side surface of the rotating shaft, an mounting plate rotatably connected to the side surface of the bushing, a sealing ring fixedly connected to the side surface of the mounting plate, a positioning cylinder threadedly connected to the inner side wall of the mounting plate, and a positioning thread fixedly connected to the inner side surface of the positioning cylinder.

[0005] An air inlet pipe is fixedly connected to the side surface of the mounting plate, and a ventilation channel is provided inside the mounting plate. A retaining ring is fixedly connected to the inner side wall of the mounting plate, and a piston is slidably connected to the inner side wall of the retaining ring. A compression ring is fixedly connected to the end of the piston near the retaining ring. Through these components, the positioning threads on the positioning cylinder and the high-pressure steam entering the ventilation channel simultaneously push the piston and the compression ring, compressing the bushing from both sides to reduce the gap between the bushing and the rotating shaft, thereby improving the sealing effect between the inner side of the bushing and the rotating shaft.

[0006] According to the combined sealing structure of the MVR centrifugal steam compressor described in this utility model, the mounting plate has a through groove inside, and the compression ring and the fixing ring are located inside the through groove. This allows the compression ring to compress the bushing inside the through groove.

[0007] According to the combined sealing structure of the MVR centrifugal steam compressor described in this utility model, the piston is located inside the ventilation channel and is slidably connected to the mounting plate. The compression ring, acting as a piston, has one end in contact with the bushing. This allows the steam entering the ventilation channel to push the piston along the mounting plate.

[0008] According to the combined sealing structure of the MVR centrifugal steam compressor described in this utility model, the side surface of the bushing is rotatably connected to the positioning cylinder, and the side surface of the bushing is engaged with the positioning thread. The positioning thread on the positioning cylinder enhances the sealing effect between the bushing and the rotating shaft.

[0009] According to the combined sealing structure of the MVR centrifugal steam compressor described in this utility model, a connecting ring is fixedly connected to the side surface of the bushing, and the side surface of the connecting ring is rotatably connected to the sealing ring. The connecting ring connects the bushing and the sealing ring to enhance the sealing performance.

[0010] According to the combined sealing structure of the MVR centrifugal steam compressor described in this utility model, a fixing part is fixedly connected to the side surface of the mounting plate, and screws are threadedly connected to the side surface of the mounting plate. The fixing part is fixed to the mounting plate using screws.

[0011] According to the present invention, a combined sealing structure for an MVR centrifugal steam compressor includes a sealing cavity between the fixed part and the mounting plate, with a sealing ring located inside the sealing cavity. The sealing ring seals the connection between the mounting plate and the fixed part.

[0012] According to the combined sealing structure of the MVR centrifugal steam compressor described in this utility model, the end of the sealing ring away from the mounting plate is fitted with the fixing part, and the side surface of the rotating shaft is rotatably connected to the sealing ring. The sealing ring is used to seal the connection between the mounting plate and the fixing part.

[0013] Beneficial effects:

[0014] The combined sealing structure of the MVR centrifugal steam compressor in this technical solution uses a set of positioning cylinders installed on the mounting plate. The positioning threads on the inner side of the positioning cylinders compress the bushing, reducing the gap between the bushing and the rotating shaft, thereby improving the sealing effect between the inner side of the bushing and the rotating shaft. High-pressure steam is introduced into the ventilation channel to push the piston, causing the compression ring to compress the bushing, which also makes the bushing and the rotating shaft fit more tightly. Through the dual compression effect of the fixed cylinder, the sealing performance between the rotating shaft and the bushing is further improved. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0016] Figure 1 This is a cross-sectional view of the combined sealing structure of the MVR centrifugal steam compressor of this utility model;

[0017] Figure 2 This is a structural diagram of the positioning cylinder of the combined sealing structure of the MVR centrifugal steam compressor of this utility model;

[0018] Figure 3 This is a structural diagram of the bushing of the combined sealing structure of the MVR centrifugal steam compressor of this utility model;

[0019] Figure 4 This is a structural diagram of the fixed ring and the compression ring of the combined sealing structure of the MVR centrifugal steam compressor of this utility model.

[0020] Legend:

[0021] 1. Mounting plate; 2. Screws; 3. Fixing part; 4. Shaft; 5. Sealing ring; 6. Sealing cavity; 7. Air inlet pipe; 8. Ventilation channel; 9. Piston; 10. Bushing; 11. Positioning cylinder; 12. Through groove; 13. Positioning thread; 14. Connecting ring; 15. Fixing ring; 16. Compression ring. Detailed Implementation

[0022] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0023] Reference Figure 1-4This utility model provides a combined sealing structure for an MVR centrifugal steam compressor, comprising: a rotating shaft 4, a bushing 10 fixedly connected to the side surface of the rotating shaft 4, an mounting plate 1 rotatably connected to the side surface of the bushing 10, a sealing ring 5 fixedly connected to the side surface of the mounting plate 1, the side surface of the rotating shaft 4 rotatably connected to the sealing ring 5, a positioning cylinder 11 threadedly connected to the inner side wall of the mounting plate 1, the side surface of the bushing 10 rotatably connected to the positioning cylinder 11, a positioning thread 13 fixedly connected to the inner side surface of the positioning cylinder 11, and the side surface of the bushing 10 fitting against the positioning thread 13;

[0024] Specifically, the rotating shaft 4 and the bushing 10 are both mounted on the mounting plate 1, and the sealing ring 5 is connected to the rotating shaft 4 and the bushing 10. Then, the positioning cylinder 11 is mounted on the mounting plate 1 by means of threaded connection, and the inner side of the positioning cylinder 11 is in contact with the bushing 10. At the same time, the positioning thread 13 on the inner side of the positioning cylinder 11 will squeeze the bushing 10, thereby improving the sealing effect between the bushing 10 and the rotating shaft 4.

[0025] An air inlet pipe 7 is fixedly connected to the side surface of the mounting plate 1. An air passage 8 is provided inside the mounting plate 1. A fixing ring 15 is fixedly connected to the inner side wall of the mounting plate 1. A piston 9 is slidably connected to the inner side wall of the fixing ring 15. A compression ring 16 is fixedly connected to one end of the piston 9 near the fixing ring 15.

[0026] Specifically, during the use of the device, high-pressure steam enters the mounting plate 1 through the air inlet pipe 7 and the ventilation channel 8. As it flows through the ventilation channel 8, it pushes the piston 9, which in turn pushes the compression ring 16 along the mounting plate 1 and the fixing ring 15. The compression ring 16 then compresses the bushing 10. The outer side of the bushing 10 is subjected to compression force, which reduces the gap between the inner side of the bushing 10 and the rotating shaft 4, thereby increasing the sealing between the bushing 10 and the rotating shaft 4.

[0027] The mounting plate 1 has a through groove 12 inside. The compression ring 16 and the fixing ring 15 are located inside the through groove 12. The piston 9 is located inside the ventilation channel 8 and is slidably connected to the mounting plate 1. The compression ring 16 is in contact with one end of the piston 9 and the bushing 10.

[0028] Specifically, the extrusion ring 16 and the fixing ring 15 are located inside the through groove 12, while the piston 9 is located inside the ventilation channel 8. At the same time, the piston 9 seals the connection between the through groove 12 and the ventilation channel 8 to prevent steam from entering the through groove 12. The fixing ring 15 is used to position the extrusion ring 16 and the piston 9.

[0029] A connecting ring 14 is fixedly connected to the side surface of the bushing 10. The side surface of the connecting ring 14 is rotatably connected to the sealing ring 5. A fixing part 3 is fixedly connected to the side surface of the mounting plate 1. The end of the sealing ring 5 away from the mounting plate 1 is in contact with the fixing part 3. A screw 2 is threadedly connected to the side surface of the mounting plate 1. A sealing cavity 6 is provided between the fixing part 3 and the mounting plate 1. The sealing ring 5 is located inside the sealing cavity 6.

[0030] Specifically, a connecting ring 14 is provided on the outer side of the bushing 10 to connect the sealing ring 5 and the bushing 10, thereby increasing the sealing performance between the bushing 10 and the sealing ring 5. Then, the fixing part 3 is installed on the mounting plate 1 by screws 2, and the fixing part 3 is made to fit with the sealing ring 5 to increase the sealing performance between the sealing ring 5 and the fixing part 3 in the sealing cavity 6.

[0031] Working principle: The rotating shaft 4 and the bushing 10 are both mounted on the mounting plate 1, and the sealing ring 5 is connected to the rotating shaft 4 and the bushing 10. Then, the positioning cylinder 11 is installed on the mounting plate 1 by means of threaded connection, and the inner side of the positioning cylinder 11 is in contact with the bushing 10. At the same time, the positioning thread 13 on the inner side of the positioning cylinder 11 will squeeze the bushing 10, thereby improving the sealing effect between the bushing 10 and the rotating shaft 4. During the use of the device, high-pressure steam will enter the interior of the mounting plate 1 through the air inlet pipe 7 along the air passage 8, and push the piston 9 as it flows through the air passage 8. This causes the piston 9 to push the compression ring 16 along the mounting plate 1 and the fixing ring 15, so that the compression ring 16 squeezes the bushing 10. The outer side of the bushing 10 is subjected to compression force, thereby reducing the gap between the inner side of the bushing 10 and the rotating shaft 4, thereby increasing the sealing performance between the bushing 10 and the rotating shaft 4.

[0032] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A combined sealing structure for an MVR centrifugal steam compressor, characterized in that, include: A rotating shaft (4) is fixedly connected to a bushing (10) on its side surface. A mounting plate (1) is rotatably connected to the side surface of the bushing (10). A sealing ring (5) is fixedly connected to the side surface of the mounting plate (1). A positioning cylinder (11) is threadedly connected to the inner side wall of the mounting plate (1). A positioning thread (13) is fixedly connected to the inner side surface of the positioning cylinder (11). An air inlet pipe (7) is fixedly connected to the side surface of the mounting plate (1). An air passage (8) is provided inside the mounting plate (1). A fixing ring (15) is fixedly connected to the inner side wall of the mounting plate (1). A piston (9) is slidably connected to the inner side wall of the fixing ring (15). A compression ring (16) is fixedly connected to one end of the piston (9) near the fixing ring (15).

2. The combined sealing structure for an MVR centrifugal steam compressor according to claim 1, characterized in that, The mounting plate (1) has a through groove (12) inside, and the compression ring (16) and the fixing ring (15) are located inside the through groove (12).

3. The combined sealing structure for an MVR centrifugal steam compressor according to claim 1, characterized in that, The piston (9) is located inside the ventilation channel (8) and is slidably connected to the mounting plate (1). The compression ring (16) is attached to one end of the piston (9) and the bushing (10).

4. The combined sealing structure for an MVR centrifugal steam compressor according to claim 1, characterized in that, The side surface of the bushing (10) is rotatably connected to the positioning cylinder (11), and the side surface of the bushing (10) is in contact with the positioning thread (13).

5. The combined sealing structure for an MVR centrifugal steam compressor according to claim 1, characterized in that, A connecting ring (14) is fixedly connected to the side surface of the bushing (10), and the side surface of the connecting ring (14) is rotatably connected to the sealing ring (5).

6. The combined sealing structure for an MVR centrifugal steam compressor according to claim 1, characterized in that, The mounting plate (1) has a fixing part (3) fixedly connected to its side surface, and a screw (2) is threadedly connected to the side surface of the mounting plate (1).

7. The combined sealing structure for an MVR centrifugal steam compressor according to claim 6, characterized in that, A sealing cavity (6) is provided between the fixing part (3) and the mounting plate (1), and the sealing ring (5) is located inside the sealing cavity (6).

8. The combined sealing structure for an MVR centrifugal steam compressor according to claim 1, characterized in that, The end of the sealing ring (5) away from the mounting plate (1) is attached to the fixing part (3), and the side surface of the rotating shaft (4) is rotatably connected to the sealing ring (5).

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