Sealing device for cold and hot ends of central cylinder of air pre-heater

Abstract

The utility model provides a sealing device for cold and hot ends of a central cylinder of an air pre-heater, which comprises a main shaft at the cold end or the hot end and a bottom plate, and the main shaft penetrates through the bottom plate; the two flexible sealing cylinders are arranged on the main shaft in a vertically spaced sealing and sleeving mode, the two flexible sealing cylinders are sleeved with sealing sleeves, and the upper end and the lower end of each sealing sleeve are connected with the top of one flexible sealing cylinder and the bottom of the other flexible sealing cylinder in a sealed and inserted mode through first connecting pieces correspondingly to form a sealing cavity; the peripheral wall of the sealing sleeve is connected with the bottom plate through a second connecting piece; the graphite packing is arranged on the main shaft in a sleeving mode and located in the sealing cavity. The sealing performance of the sealing cavity and the sealing performance between the graphite packing and the main shaft are ensured, so that the situation of ash leakage caused by a gap generated by friction between the graphite packing and the main shaft is avoided, and the sealing efficiency of the cold and hot ends of the central cylinder of the air pre-heater is improved.

Description

Technical Field

[0001] The present application relates to the technical field of air preheaters, and in particular to a sealing device for the cold and hot ends of a central tube of an air preheater. Background Art

[0002] The air preheater, also referred to as an air preheater, is a preheating device that improves the heat exchange performance of the boiler and reduces heat loss. The function of the air preheater is to transfer the heat carried in the flue gas discharged from the tail flue of the boiler to the air before entering the boiler through the heat sink, and preheat the air to a certain temperature.

[0003] At present, the existing central cylinder sealing structure of air preheater is mostly graphite packing seal. The friction between the rotating central cylinder and the graphite packing and the shaking and rotating friction of the rotor cause the gap between the rotor and the graphite packing to gradually increase. The hot air carrying dust leaks out through the gap. At the same time, the leakage of dust aggravates the wear of the sealing structure, causing the central cylinder sealing gap to become larger and larger. Long-term use will reduce the performance of the air preheater and the leaked flue gas will cause serious pollution to the environment. Therefore, there is an urgent need for a sealing device that can be used for the hot and cold ends of the central cylinder of the air preheater. Utility Model Content

[0004] The present application provides a sealing device for the cold and hot ends of the central tube of an air preheater, which is used to solve the technical problems recorded in the above-mentioned background technology.

[0005] In order to solve the above technical problems, this application adopts the following technical solutions:

[0006] The present application provides a sealing device for the cold and hot ends of the central tube of an air preheater, comprising: a main shaft of the cold end or the hot end and a bottom plate, wherein the main shaft passes through the bottom plate;

[0007] Two flexible sealing cylinders, the two flexible sealing cylinders are arranged on the main shaft with a sealing sleeve spaced therebetween, the two flexible sealing cylinders are sleeved with a sealing sleeve, the upper and lower ends of the sealing sleeve are respectively sealed and plugged with the top of one of the flexible sealing cylinders and the bottom of the other flexible sealing cylinder through a first connecting piece to form a sealed chamber, and the outer peripheral wall of the sealing sleeve is connected to the bottom plate through a second connecting piece;

[0008] A graphite packing is sleeved on the main shaft and located in the sealing chamber.

[0009] Optionally, the first connecting member includes two first annular plates;

[0010] One of the first annular plates is arranged on the inner circumferential wall of the sealing sleeve near the top of the sealing sleeve, and the other first annular plate is arranged on the inner circumferential wall of the sealing sleeve near the bottom of the sealing sleeve. A sealing insert is sleeved in each of the two first annular plates, and the bottom end of one of the sealing inserts is sealingly plugged into the top of the corresponding flexible sealing sleeve, and the top end of the other sealing insert is sealingly plugged into the bottom of the corresponding flexible sealing sleeve.

[0011] Optionally, an annular sealing groove is formed at the top of one of the flexible sealing tubes and the bottom of the other flexible sealing tube, the bottom of one of the sealing inserts is inserted into the corresponding annular sealing groove, and the top of the other sealing insert is inserted into the corresponding annular sealing groove.

[0012] Optionally, the second connecting member includes a second annular plate and a connecting rod;

[0013] The bottom plate is provided with a plurality of inverted "T"-shaped grooves, the second annular plate is sleeved on the middle part of the sealing sleeve, and the bottom end of the connecting rod passes through the second annular plate and is inserted into the inverted "T"-shaped grooves.

[0014] Optionally, the connecting rod is connected to the outer peripheral wall of the sealing sleeve via a tension spring.

[0015] Optionally, a ball bearing is disposed at the bottom end of each of the plurality of connecting rods.

[0016] Optionally, a receiving groove matching the sealing sleeve is formed on the bottom plate, and the bottom of the sealing sleeve is embedded in the receiving groove.

[0017] The sealing device for the hot and cold ends of the central tube of the air preheater provided in the present application makes the graphite packing sleeved on the main shaft be located in a sealed chamber formed between two flexible sealing sleeves sleeved on the main shaft through upper and lower spacing sealing sleeves and sealing sleeves plugged into the top and bottom of the two sealing sleeves through the first connecting piece, so that the graphite packing is in a sealed space, and because the flexible sealing sleeve has good flexibility, adjustability, self-lubrication and anti-sticking properties, it can fit tightly with the main shaft, thereby ensuring the sealing performance of the sealed chamber. In addition, the outer peripheral wall of the sealing sleeve is movably connected to the bottom plate through the second connecting piece, so that during the rotation of the main shaft of the cold end or hot end of the central tube of the air preheater, the two flexible sealing sleeves are always connected to the main shaft sealing sleeve, further ensuring the sealing performance of the sealed chamber and the sealing between the graphite packing and the main shaft, thereby avoiding the leakage of ash caused by the gap between the graphite packing and the main shaft due to friction, thereby improving the sealing efficiency of the hot and cold ends of the central tube of the air preheater. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 A schematic structural diagram of a sealing device for the hot and cold ends of an air preheater central tube provided in one embodiment of the present application;

[0020] Figure 2 A schematic structural diagram of a sealing device for hot and cold ends of an air preheater central tube provided in another embodiment of the present application;

[0021] Figure 3 A schematic structural diagram of a sealing device for the hot and cold ends of the central tube of an air preheater provided in another embodiment of the present application;

[0022] Figure 4 A schematic structural diagram of a sealing device for the cold and hot ends of the central tube of an air preheater provided in another embodiment of the present application.

[0023] In the figure: 100, main shaft; 200, bottom plate; 201, inverted "T"-shaped groove; 202, accommodating groove; 300, flexible sealing cylinder; 301, annular sealing groove; 400, sealing sleeve; 401, first connecting member; 4011, first annular plate; 4012, sealing insert; 402, second connecting member; 4021, second annular plate; 4022, connecting rod; 500, sealing chamber; 402, second connecting member; 600, graphite packing; 700, tension spring; 800, ball. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the present application.

[0025] refer to Figures 1 to 4 The present application provides a sealing device for the cold and hot ends of the central tube of an air preheater, comprising: a main shaft 100 at the cold end or the hot end and a base plate 200, wherein the main shaft 100 passes through the base plate 200; wherein the sealing device provided by the present application is suitable for sealing the cold end of the central tube of an air preheater and the hot end of the central tube of an air preheater.

[0026] Two flexible sealing tubes 300, the two flexible sealing tubes 300 are arranged on the main shaft 100 with sealing sleeves in between, the two flexible sealing tubes 300 are sleeved with sealing sleeves 400, the upper and lower ends of the sealing sleeves 400 are respectively sealed and plugged with the top of one of the flexible sealing tubes 300 and the bottom of the other flexible sealing tube 300 through the first connecting piece 401 to form a sealed chamber 500, and the outer peripheral wall of the sealing sleeve 400 is connected to the bottom plate 200 through the second connecting piece 402; wherein, the flexible sealing tube 300 can be made of polypropylene, which can be set according to actual needs, in order to ensure the sealing performance of the connection between it and the main shaft 100, therefore, the present application does not make specific limitations on it. Since the flexible sealing cylinder 300 has good flexibility, adjustability, self-lubrication and anti-sticking properties, it can fit tightly with the main shaft 100, so that it has better sealing performance with the sealing chamber 500 formed between the sealing sleeves 400 that are sealed and plugged into the top and bottom of the two sealing sleeves 400 through the first connecting piece 401, and the outer peripheral wall of the sealing sleeve 400 is connected to the bottom plate 200 through the second connecting piece 402, further ensuring the sealing performance of the sealing chamber 500.

[0027] Graphite packing 600 is sleeved on the main shaft 100 and is located in the sealed chamber 500, so that the graphite packing 600 is always in the sealed chamber 500 with good sealing performance, thereby avoiding the gap between the graphite packing 600 and the main shaft 100 due to friction and causing ash leakage, thereby improving the sealing efficiency of the cold and hot ends of the air preheater center tube.

[0028] The sealing device for the hot and cold ends of the central tube of the air preheater provided in the present application comprises a flexible sealing tube 300, a graphite packing 600 and a flexible sealing tube 300 sequentially sleeved on the main shaft 100 from top to bottom, and the upper and lower ends of the sealing sleeve 400 sleeved on the two flexible sealing tubes 300 are respectively sealed and plugged with the top and bottom of the two sealing sleeves 400 through the first connecting piece 401 to form a sealed chamber 500, and the graphite packing 600 is located in the sealed chamber 500. Since the flexible sealing tube 300 has good flexibility, adjustability, self-lubrication and anti-sticking properties, it can fit tightly with the main shaft 100, thereby ensuring the sealing performance of the sealed chamber 500. In addition, the outer peripheral wall of the sealing sleeve 400 is movably connected to the base plate 200 through the second connecting piece 402, so that during the rotation of the main shaft 100 at the cold end or hot end of the central tube of the air preheater, the two flexible sealing sleeves 300 are always connected to the sealing sleeve of the main shaft 100, further ensuring the sealing performance of the sealing chamber 500 and the sealing between the graphite packing 600 and the main shaft 100, thereby avoiding the leakage of ash caused by the gap between the graphite packing 600 and the main shaft 100 due to friction, thereby improving the sealing efficiency of the cold and hot ends of the central tube of the air preheater.

[0029] In some embodiments, reference Figure 1-Figure 4 The first connector 401 in the present application includes two first annular plates 4011; specifically, one of the first annular plates 4011 is arranged on the inner circumferential wall of the sealing sleeve 400 near the top of the sealing sleeve 400, and the other first annular plate 4011 is arranged on the inner circumferential wall of the sealing sleeve 400 near the bottom of the sealing sleeve 400, and the two first annular plates 4011 are both sleeved with a sealing insert 4012, and the bottom end of one sealing insert 4012 is sealed and plugged with the top of the corresponding flexible sealing sleeve 300, and the top end of the other sealing insert 4012 is sealed and plugged with the bottom of the corresponding flexible sealing sleeve 300. Among them, the height of the two sealing inserts 4012 determines the stability of their plugging with the flexible sealing sleeve 300, which can be set according to actual needs, so the present application does not make specific restrictions on it. The first annular plate 4011 can be integrally formed with the sealing sleeve 400, the purpose of which is to ensure the stability of the connection between the first annular plate 4011 and the sealing sleeve 400.

[0030] In the above embodiment, the top and bottom of the sealing sleeve 400 are plugged into the top and bottom surfaces of the corresponding flexible sealing sleeves 300 through the sealing insert 4012, so that the connection between the sealing sleeve 400 and the two flexible sealing sleeves 300 is tighter, thereby improving the stability of the connection between the two.

[0031] In some embodiments, reference Figure 2 In the present application, the top of one flexible sealing cylinder 300 and the bottom of the other flexible sealing cylinder 300 are both provided with an annular sealing groove 301, the bottom of one sealing insert 4012 is inserted into the corresponding annular sealing groove 301, and the top of the other sealing insert 4012 is inserted into the corresponding annular sealing groove 301. The annular sealing groove 301 has a certain depth, the purpose is to ensure the stability of the sealing insert 4012 inserted therewith, and the depth value of the annular sealing groove 301 can be set according to actual needs, so the present application does not specifically limit it here.

[0032] In some embodiments, reference Figures 1 to 4The second connecting member 402 in the present application includes a second annular plate 4021 and a connecting rod 4022; specifically, a plurality of inverted "T"-shaped grooves 201 are provided on the bottom plate 200, the second annular plate 4021 is sleeved in the middle of the sealing sleeve 400, and the bottom end of the connecting rod 4022 passes through the second annular plate 4021 and is inserted into the inverted "T"-shaped groove 201. Among them, a plurality of inverted "T"-shaped grooves 201 are provided on the upper surface of the bottom plate 200 at equal intervals around the sealing sleeve 400, and there are a plurality of connecting rods 4022, and the plurality of connecting rods 4022 correspond to the plurality of inverted "T"-shaped grooves 201 one by one, so that the stability of the connection between the second annular plate 4021 and the bottom plate 200 can be ensured, and the number of inverted "T"-shaped grooves 201 can be set according to actual needs, so the present application does not make specific restrictions on it.

[0033] In the above embodiment, the bottom end of the connecting rod 4022 is inserted into the groove at the large end of the inverted "T"-shaped groove 201, that is, during the rotation of the main shaft 100, the bottom end of the connecting rod 4022 can move in the inverted "T"-shaped groove 201 with the rotation of the main shaft 100, thereby preventing the connecting rod 4022 from breaking due to circumferential force, thereby improving the stability of the connection between the second annular plate 4021 and the base plate 200.

[0034] In some embodiments, reference Figure 4 The connecting rod 4022 in the present application is connected to the outer peripheral wall of the sealing sleeve 400 through the tension spring 700. The setting of the tension spring 700 makes the connecting rod 4022 and the sealing sleeve 400 always close to each other, thus preventing the flexible sealing cylinder 300 from being subjected to a force away from the main shaft 100, ensuring the tightness of the connection between the flexible sealing cylinder 300 and the main shaft 100, and further ensuring the sealing performance of the sealing chamber 500 and the sealing performance between the graphite packing 600 in the sealing chamber 500 and the main shaft 100, avoiding the situation of ash leakage caused by the gap between the graphite packing 600 and the main shaft 100 due to friction, thereby improving the sealing efficiency of the cold and hot ends of the central cylinder of the air preheater.

[0035] In some embodiments, reference Figure 3 The bottom ends of the multiple connecting rods 4022 in the present application are all provided with balls 800. The provision of the balls 800 reduces the friction between the bottom end of the connecting rod 4022 and the inner bottom surface of the inverted "T" groove 201 during the movement in the inverted "T" groove 201, so that the connection between the flexible sealing cylinder 300 and the sealing sleeve 400 is more stable during the rotation of the main shaft 100.

[0036] In some embodiments, reference Figures 2 to 4In the present application, a receiving groove 202 matching with the sealing sleeve 400 is provided on the bottom plate 200, and the bottom of the sealing sleeve 400 is embedded in the receiving groove 202. The receiving groove 202 has a certain depth, and the purpose is to ensure that the bottom of the sealing sleeve 400 is embedded in the receiving groove 202, so as to improve the stability of the connection between the bottom plate 200 and the sealing sleeve 400, and the depth value of the sealing sleeve 400 can be set according to actual needs, so the present application does not specifically limit it here.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A sealing device for the cold and hot ends of the central tube of an air preheater, characterized in that: include: A main shaft (100) at a cold end or a hot end and a bottom plate (200), wherein the main shaft (100) passes through the bottom plate (200); Two flexible sealing cylinders (300), the two flexible sealing cylinders (300) are arranged on the main shaft (100) with sealing sleeves at intervals, the two flexible sealing cylinders (300) are sleeved with sealing sleeves (400), the upper and lower ends of the sealing sleeves (400) are respectively sealed and plugged with the top of one of the flexible sealing cylinders (300) and the bottom of the other flexible sealing cylinder (300) through a first connecting piece (401) to form a sealed chamber (500), and the outer peripheral wall of the sealing sleeve (400) is connected to the bottom plate (200) through a second connecting piece (402); A graphite packing (600) is sleeved on the main shaft (100) and is located in the sealed chamber (500).

2. The sealing device for hot and cold ends of the central tube of the air preheater according to claim 1 is characterized in that: The first connecting member (401) comprises two first annular plates (4011); One of the first annular plates (4011) is arranged on the inner circumferential wall of the sealing sleeve (400) near the top of the sealing sleeve (400), and the other of the first annular plates (4011) is arranged on the inner circumferential wall of the sealing sleeve (400) near the bottom of the sealing sleeve (400). A sealing insert (4012) is sleeved in both of the two first annular plates (4011), and the bottom end of one of the sealing inserts (4012) is sealingly plugged with the top of the corresponding flexible sealing sleeve (300), and the top end of the other of the sealing inserts (4012) is sealingly plugged with the bottom of the corresponding flexible sealing sleeve (300).

3. The sealing device for hot and cold ends of the central tube of the air preheater according to claim 2 is characterized in that: An annular sealing groove (301) is provided at the top of one of the flexible sealing tubes (300) and at the bottom of the other flexible sealing tube (300), the bottom of one of the sealing inserts (4012) is inserted into the corresponding annular sealing groove (301), and the top of the other sealing insert (4012) is inserted into the corresponding annular sealing groove (301).

4. The sealing device for hot and cold ends of the central tube of the air preheater according to claim 1 is characterized in that: The second connecting member (402) comprises a second annular plate (4021) and a connecting rod (4022); The bottom plate (200) is provided with a plurality of inverted "T"-shaped grooves (201); the second annular plate (4021) is sleeved on the middle part of the sealing sleeve (400); and the bottom end of the connecting rod (4022) passes through the second annular plate (4021) and is inserted into the inverted "T"-shaped groove (201).

5. The sealing device for hot and cold ends of the central tube of the air preheater according to claim 4 is characterized in that: The connecting rod (4022) is connected to the outer peripheral wall of the sealing sleeve (400) via a tension spring (700).

6. The sealing device for hot and cold ends of the central tube of the air preheater according to claim 4 is characterized in that: The bottom ends of the plurality of connecting rods (4022) are each provided with a ball (800).

7. The sealing device for hot and cold ends of the central tube of an air preheater according to any one of claims 1 to 6, characterized in that: The bottom plate (200) is provided with a receiving groove (202) matching the sealing sleeve (400), and the bottom of the sealing sleeve (400) is embedded in the receiving groove (202).

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