Sealing structure of centrifugal steam compressor

Abstract

The utility model discloses a sealing structure of a centrifugal steam compressor, which belongs to the field of centrifugal steam compressors and comprises a rotating shaft, a sealing mechanism and a shaft sleeve sleeved on the outer side of the rotating shaft, a first sealing ring and a second sealing ring are respectively mounted on the outer side of the rotating shaft, and the sealing mechanism comprises a sealing cylinder matched with the compressor. And a plurality of extrusion blocks which are distributed in a circumferential array are arranged in the sealing cylinder part. According to the utility model, under the elastic action of the elastic piece, the plurality of extrusion blocks can be attached to the shaft sleeve, and when high-pressure steam enters the pressure bin through the steam channel, the extrusion blocks can be extruded, so that the extrusion blocks are tightly attached to the outer side of the shaft sleeve, the shaft sleeve is further tightly attached to the rotating shaft, and the first sealing ring and the second sealing ring are attached to the port of the sealing cylinder piece; the sealing cylinder piece and the rotating shaft are kept sealed, environment air can be effectively prevented from entering to damage the vacuum degree of a system, meanwhile, steam can be prevented from entering a gear box to avoid lubricating oil emulsification, and guarantee is provided for stable operation of equipment.

Description

Technical Field

[0001] The utility model relates to the field of centrifugal steam compressors, in particular to a sealing structure of a centrifugal steam compressor. Background Art

[0002] Centrifugal steam compressor is a kind of equipment which compresses steam by centrifugal force. It is widely used in various industrial fields, especially in occasions where a large amount of gas supply is required, such as petrochemical, energy and other industries.

[0003] Centrifugal steam compressors are used with matching gearboxes. The rotating shaft is lubricated by lubricating oil in the gearbox. In order to reduce or prevent mechanical failures caused by gas leakage, a sealing structure is used to seal it.

[0004] Although the sealing structure in the prior art can achieve a certain sealing function through the structure of the prior art, it still has the following defects: in the actual operation of the compressor, surge conditions sometimes occur. At this time, ambient air can easily enter and destroy the vacuum of the system, and high-pressure steam can easily leak through the shaft gap, causing high-pressure steam to enter the gear box and cause lubricating oil emulsification, affecting the operation of the equipment. Utility Model Content

[0005] The utility model aims to solve the problems in the prior art and proposes a centrifugal steam compressor sealing structure.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A centrifugal steam compressor sealing structure comprises a rotating shaft, a sealing mechanism and a sleeve sleeved on the outer side of the rotating shaft, wherein a first sealing ring and a second sealing ring are respectively installed on the outer side of the rotating shaft, and the sealing mechanism comprises a sealing cylinder adapted to the compressor, wherein a plurality of extrusion blocks distributed in a circumferential array are arranged inside the sealing cylinder, a pressure bin is provided inside the sealing cylinder, and elastic members are fixedly connected between the backs of the plurality of extrusion blocks and the inner wall of the pressure bin, and a plurality of steam channels are provided on one side of the sealing cylinder, and one end of the steam channel is communicated with the pressure bin.

[0008] Preferably, a first mounting groove matched with a first sealing ring is formed at one end of the rotating shaft, a convex ring for positioning the sleeve is integrally formed on the outer side of the rotating shaft, and a second mounting groove matched with a second sealing ring is formed on the outer side of the convex ring.

[0009] Preferably, a stepped groove matching one end of the rotating shaft close to the first mounting groove is formed at one end of the sealing cylinder, and the first sealing ring on the outer side of the rotating shaft fits with the port of the sealing cylinder.

[0010] Preferably, the second sealing ring on the outer side of the rotating shaft fits with the other end of the sealing cylinder.

[0011] Preferably, the extrusion block is slidably connected to the inner wall of the pressure chamber, and the extrusion block is adapted to the size of the shaft sleeve.

[0012] Preferably, a mounting portion is integrally formed on the outer side of the sealing cylinder, and a plurality of evenly distributed mounting holes are formed on the mounting portion.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] Through the arrangement of the first sealing ring and the second sealing ring on the outside of the rotating shaft and the various components of the sealing mechanism, under the elastic action of the elastic member, multiple extrusion blocks can fit with the shaft sleeve. When high-pressure steam enters the pressure chamber through the steam channel, the extrusion blocks will be squeezed to make the extrusion blocks fit tightly against the outside of the shaft sleeve, thereby making the shaft sleeve and the rotating shaft fit tightly. The first sealing ring fits with the port of the sealing cylinder, and the second sealing ring on the outside of the convex ring on the surface of the rotating shaft fits with the other port of the sealing cylinder, so that the sealing cylinder and the rotating shaft are kept sealed, which can effectively prevent ambient air from entering and destroying the vacuum of the system. At the same time, it can isolate steam from entering the gear box to avoid emulsification of the lubricating oil, thereby providing guarantee for the stable operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural schematic diagram of the utility model in an assembled state;

[0016] Figure 2 It is a three-dimensional structural schematic diagram of a partial section of the utility model in an assembled state;

[0017] Figure 3 It is a schematic diagram of the three-dimensional structure of the utility model in a separated state;

[0018] Figure 4 It is a three-dimensional structural schematic diagram of the utility model in the assembled state of the rotating shaft, the shaft sleeve, the first sealing ring and the second sealing ring;

[0019] Figure 5 It is a three-dimensional structural schematic diagram of a partial cross section of the sealing mechanism of the utility model.

[0020] In the figure:

[0021] 1. rotating shaft; 11. first mounting groove; 12. convex ring; 13. second mounting groove;

[0022] 2. Sealing mechanism; 21. Sealing cylinder; 211. Pressure chamber; 212. Steam channel; 213. Step groove; 214. Mounting part; 22. Extrusion block; 23. Elastic member;

[0023] 3. Bushing;

[0024] 4. The first sealing ring;

[0025] 5. Second sealing ring. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0027] Reference Figure 1-5 The centrifugal steam compressor sealing structure comprises a rotating shaft 1, a sealing mechanism 2 and a sleeve 3 sleeved on the outer side of the rotating shaft 1, a first sealing ring 4 and a second sealing ring 5 are respectively installed on the outer side of the rotating shaft 1, the sealing mechanism 2 comprises a sealing cylinder 21 adapted to the compressor, a plurality of extrusion blocks 22 distributed in a circumferential array are arranged inside the sealing cylinder 21, a pressure chamber 211 is provided inside the sealing cylinder 21, an elastic member 23 is fixedly connected between the backs of the plurality of extrusion blocks 22 and the inner wall of the pressure chamber 211, under the elastic action of the elastic member 23, the plurality of extrusion blocks 22 can fit with the sleeve 3, a plurality of steam channels 212 are provided on one side of the sealing cylinder 21, one end of the steam channel 212 is connected with the pressure chamber 211, when the high-pressure steam enters the pressure chamber 211 through the steam channel 212, the extrusion block 22 is squeezed, so that the extrusion block 22 is tightly attached to the outer side of the sleeve 3, thereby making the sleeve 3 and the rotating shaft 1 fit tightly, thereby improving the sealing performance of the sealing mechanism 2.

[0028] A first mounting groove 11 matched with the first sealing ring 4 is formed at one end of the rotating shaft 1, and a convex ring 12 for positioning the shaft sleeve 3 is integrally formed on the outer side of the rotating shaft 1. A second mounting groove 13 matched with the second sealing ring 5 is formed on the outer side of the convex ring 12. The shaft sleeve 3 is sleeved on the outer side of the rotating shaft 1, and the convex ring 12 can position the shaft sleeve 3. The first sealing ring 4 is installed in the first mounting groove 11 on the outer side of the rotating shaft 1, and the second sealing ring 5 is installed in the second mounting groove 13 on the outer side of the convex ring 12.

[0029] A stepped groove 213 is formed at one end of the sealing cylinder 21 to match the end of the rotating shaft 1 close to the first mounting groove 11, and the first sealing ring 4 on the outside of the rotating shaft 1 fits with this end of the sealing cylinder 21. After the sleeve 3, the first sealing ring 4 and the second sealing ring 5 are installed, the rotating shaft 1 is installed in the sealing cylinder 21, and the end of the rotating shaft 1 close to the first mounting groove 11 will be engaged with the stepped groove 213 at one end of the sealing cylinder 21, and at the same time, the first sealing ring 4 on the outside of the rotating shaft 1 fits with the end of the sealing cylinder 21.

[0030] The second sealing ring 5 on the outside of the rotating shaft 1 fits with the other end of the sealing cylinder 21. After the rotating shaft 1 is installed into the sealing cylinder 21, the second sealing ring 5 on the outside of the convex ring 12 on the surface of the rotating shaft 1 fits with the other end of the sealing cylinder 21, so that the sealing cylinder 21 and the rotating shaft 1 are kept sealed.

[0031] The extrusion block 22 is slidably connected to the inner wall of the pressure chamber 211 , and the extrusion block 22 is adapted to the size of the shaft sleeve 3 . The extrusion block 22 fits the shaft sleeve 3 , thereby extruding the shaft sleeve 3 .

[0032] A mounting portion 214 is integrally formed on the outer side of the sealing cylinder 21 . The mounting portion 214 is provided with a plurality of evenly distributed mounting holes. The sealing cylinder 21 is connected and fixed to the compressor body via the mounting portion 214 on the outer side.

[0033] The rotating shaft 1 and the shaft sleeve 3 are prior art, and the shaft sleeve 3 is sleeved on the outer side of the rotating shaft 1, and the two can rotate relatively.

[0034] The elastic member 23 is a prior art piece, and has elastic deformation capability, so that the extrusion block 22 can be closely attached to the shaft sleeve 3 .

[0035] The first sealing ring 4 and the second sealing ring 5 are prior art, and can maintain a sealed state between the rotating shaft 1 and the sealing cylinder 21 without affecting the rotation of the rotating shaft 1 .

[0036] When the utility model is used, the sleeve 3 is sleeved on the outer side of the rotating shaft 1, the first sealing ring 4 is installed in the first installation groove 11 on the outer side of the rotating shaft 1, the second sealing ring 5 is installed in the second installation groove 13 on the outer side of the convex ring 12, the rotating shaft 1 is installed in the sealing cylinder 21, and the end of the rotating shaft 1 close to the first installation groove 11 will be engaged with the stepped groove 213 at one end of the sealing cylinder 21, and at the same time, the first sealing ring 4 on the outer side of the rotating shaft 1 is in contact with the port of the sealing cylinder 21, and the second sealing ring 5 on the outer side of the convex ring 12 on the surface of the rotating shaft 1 is engaged with the first sealing ring 13 on the outer side of the convex ring 12. It fits with the other end of the sealing cylinder 21 to maintain a seal between the sealing cylinder 21 and the rotating shaft 1. The sealing cylinder 21 is connected and fixed to the compressor body through the outer mounting portion 214. Under the elastic action of the elastic member 23, multiple extrusion blocks 22 can fit with the sleeve 3. High-pressure steam enters the pressure chamber 211 through the steam channel 212, which will squeeze the extrusion blocks 22 and make them fit tightly against the outer side of the sleeve 3, thereby making the sleeve 3 and the rotating shaft 1 fit tightly, thereby improving the sealing performance of the sealing mechanism 2.

[0037] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A centrifugal steam compressor sealing structure, comprising a rotating shaft (1), a sealing mechanism (2) and a sleeve (3) sleeved on the outer side of the rotating shaft (1), characterized in that: A first sealing ring (4) and a second sealing ring (5) are respectively installed on the outer side of the rotating shaft (1); the sealing mechanism (2) comprises a sealing cylinder (21) adapted to the compressor; a plurality of extrusion blocks (22) distributed in a circumferential array are arranged inside the sealing cylinder (21); a pressure chamber (211) is provided inside the sealing cylinder (21); elastic members (23) are fixedly connected between the backs of the plurality of extrusion blocks (22) and the inner wall of the pressure chamber (211); a plurality of steam channels (212) are provided on one side of the sealing cylinder (21); one end of the steam channel (212) is communicated with the pressure chamber (211).

2. The centrifugal steam compressor sealing structure according to claim 1, characterized in that: A first mounting groove (11) adapted to fit the first sealing ring (4) is formed at one end of the rotating shaft (1), a convex ring (12) for positioning the shaft sleeve (3) is integrally formed on the outer side of the rotating shaft (1), and a second mounting groove (13) adapted to fit the second sealing ring (5) is formed on the outer side of the convex ring (12).

3. The centrifugal steam compressor sealing structure according to claim 2, characterized in that: A stepped groove (213) adapted to one end of the rotating shaft (1) close to the first mounting groove (11) is formed at one end of the sealing cylinder (21), and a first sealing ring (4) on the outside of the rotating shaft (1) fits the end of the sealing cylinder (21).

4. The centrifugal steam compressor sealing structure according to claim 1, characterized in that: The second sealing ring (5) on the outside of the rotating shaft (1) is fitted with the other end of the sealing cylinder (21).

5. The centrifugal steam compressor sealing structure according to claim 1, characterized in that: The extrusion block (22) is slidably connected to the inner wall of the pressure chamber (211), and the size of the extrusion block (22) is matched with that of the shaft sleeve (3).

6. The centrifugal steam compressor sealing structure according to claim 1, characterized in that: A mounting portion (214) is integrally formed on the outer side of the sealing cylinder (21), and a plurality of evenly distributed mounting holes are provided on the mounting portion (214).

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