Radial roller sealing device for rotary air preheater

Abstract

The utility model belongs to the technical field of air pre-heaters, and particularly relates to a radial roller sealing device for a rotary air pre-heater, which comprises a groove body and a sealing assembly, the whole groove body is a hollow rectangular box body and comprises an ash discharging groove and a through groove; the sealing assembly comprises a sealing plate, the top of the sealing plate is provided with a sealing part and a roller, the bottom of the sealing plate is provided with a set of limiting shoulders, and the sealing assembly further comprises a spring mechanism. According to the sealing device, the groove body is used for bearing the sealing plate, under the matching action of the limiting shoulder and the spring mechanism, the sealing plate elastically moves in the vertical direction in the through groove in the top end of the groove body, the rolling wheel is arranged on the sealing plate, and the tangent plane of the top end of the rolling wheel is 2 mm higher than the tangent plane of the top end of the sealing part. According to the rolling type sealing device, traditional sliding type contact sealing is changed into rolling type contact sealing, the service life of the sealing device is prolonged, the use cost of the device is reduced, energy consumption is reduced, and practicability of the rolling type sealing device is embodied.

Description

Technical Field

[0001] The utility model belongs to the technical field of air preheaters, and particularly relates to a radial roller sealing device for a rotary air preheater. Background Technique

[0002] An air preheater is a heat exchange device used in large boilers, generally divided into tubular and rotary types. Compared with the tubular air preheater, the rotary air preheater has the characteristics of compact structure, small volume, high heat transfer surface density, light overall machine mass, less metal consumption, convenient layout and installation, and less low-temperature corrosion, and is widely used in power station boilers. The air preheater mainly includes a rotor, a sector plate and an arc plate. In the hot operating state, the gap between the rotor and the sector plate and the arc plate will change, and this gap affects the air leakage rate of the air preheater, thereby affecting the boiler efficiency. Therefore, the sealing technology of the air preheater is particularly important.

[0003] The traditional sealing device for a rotary air preheater generally adopts a sliding contact type, and uses the friction between the sealing plate and the sector plate to achieve sealing. In this way, the wear of the sector plate and the sealing device is relatively serious, and it needs to be replaced after the device works for about one to two years, reducing the service life of the equipment and increasing the use cost of the equipment; at the same time, the form of friction movement increases the operating current of the driving motor by about 3-5A, increasing the energy consumption and also increasing the production cost. Content of the Utility Model

[0004] In view of this, aiming at the problem that the existing sealing device is of a sliding friction type, which is not conducive to improving the service life of the equipment and reducing the use cost, the utility model provides a radial roller sealing device for a rotary air preheater, aiming to change the sliding contact into a rolling contact, improve the service life of the sealing device, reduce the use cost of the device, and reduce the energy consumption.

[0005] The radial roller sealing device for a rotary air preheater includes:

[0006] A trough body for supporting the whole sealing device. The trough body is integrally a hollow rectangular box body. The side surface of the trough body is a set of short side parts and a set of long side parts arranged correspondingly. Among them, a dust discharge groove is opened on any one of the long side parts, and a first installation hole is opened on any one of the short side parts; in addition, a bottom hole is opened at the bottom of the trough body, the bottom hole is communicated with the dust discharge groove, and a set of dust discharge holes are also opened on both sides of the bottom hole; a through groove is horizontally opened along the long side part at the top end of the trough body, and the through groove is communicated with the first installation hole;

[0007] Sealing assembly, including a sealing plate slidably connected vertically inside a through groove, the width of the sealing plate being the same as the width of the through groove, and the length of the sealing plate being the same as the length of the through groove and the length of the long side of the groove body. In addition, a set of limiting shoulders are symmetrically arranged along the long side at both sides of the bottom of the sealing plate. When the bottom of the sealing plate is placed in the through groove, the set of limiting shoulders and the top of the groove body limit the sealing plate from sliding vertically upward out of the through groove; an arc-shaped sealing portion is provided at the top end of the sealing plate, and two roller grooves are also provided on the sealing portion. A roller is rotatably connected in each roller groove through a rotating shaft. Among them, a plurality of anti-slip grooves are evenly provided on the cylindrical outer surface of the roller, the rolling direction of the roller is perpendicular to the long side direction of the sealing plate, and the top cutting surface of the roller is 2 mm higher than the top cutting surface of the sealing portion;

[0008] On this basis, the sealing assembly further includes a spring mechanism that provides elastic force in the vertical direction for the sealing plate. There are two sets of spring mechanisms. Each set of spring mechanisms includes an installation ring, the installation ring is arranged above the ash discharge hole provided in the groove body, and the installation ring communicates with the ash discharge hole. In addition, one end of a spring is sleeved on the installation ring, and the other end of the spring is embedded in the bottom of the support seat. An installation column is provided at the top of the support seat, and the installation column is cooperatively connected with a second installation hole preset at the bottom of the sealing plate;

[0009] Based on the above structure, when a set of limiting shoulders are in contact and limited with the inner wall of the top of the groove body, the spring is in a partially compressed state. When the spring is in a fully compressed state, the sealing portion at the top end of the sealing plate is outside the groove body.

[0010] Preferably, in the groove body, a set of long strip-shaped adjustment holes are parallelly provided on the long side corresponding to the ash discharge groove, and the adjustment direction of the adjustment holes is the vertical direction.

[0011] Furthermore, the adjustment distance of the adjustment holes is 5 cm.

[0012] Preferably, the shape of the first installation hole matches the cross-sectional shape of the sealing plate and the limiting shoulders on both sides of the bottom of the sealing plate, and is used to partially insert the sealing plate into the groove body through the first installation hole.

[0013] Furthermore, a weight-reducing groove is provided at the bottom of the sealing plate.

[0014] Preferably, the length of a set of limiting shoulders is less than the length of the groove body.

[0015] Preferably, wear-resistant coatings are provided on the arc outer surface of the sealing portion and the cylindrical outer surface of the roller.

[0016] The beneficial effects of the present utility model are as follows:

[0017] Generally speaking, the sealing device provided by the utility model uses a groove body to carry a sealing plate. Under the combined action of a limiting shoulder and a spring mechanism, the sealing plate performs elastic movement in the vertical direction inside the through groove at the top end of the groove body. There are rollers on the sealing plate, and the top cutting surface of the rollers is 2 mm higher than the top cutting surface of the sealing part. This makes the device change the traditional sliding contact seal into a rolling contact seal, improving the service life of the sealing device, reducing the use cost of the device, and reducing energy consumption, reflecting the practicability of the utility model.

[0018] Specifically, the ash discharge groove provided on the groove body of the utility model is communicated with the bottom hole, so that the fly ash escaping here cannot accumulate. The ash discharge holes on both sides of the bottom hole can reduce the ash accumulation at the return air cavity inside the groove body. In addition, the utility model is provided with wear-resistant coatings on the arc outer surface of the sealing part and the cylindrical outer surface of the rollers, and a number of anti-slip grooves are evenly arranged on the cylindrical outer surface of the rollers. Such a setting makes the device more inclined to roll during operation, thereby increasing the service life of the device. Moreover, the utility model is also provided with long strip-shaped adjustment holes on the connecting plate, so that on the basis of fixedly installing the sealing device, the overall height of the device can be adjusted with a maximum stroke of 4 cm, reflecting the practicability of the utility model. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0020] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0021] Figure 2 It is an exploded structure schematic diagram of the sealing device provided by the present utility model;

[0022] Figure 3 It is a three-dimensional structure schematic diagram of the groove body in the present utility model;

[0023] Figure 4 It is a specific structure schematic diagram of the sealing plate in the present utility model. Detailed Embodiments

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0025] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model; the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly defined and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0026] The following will describe in detail the solution provided by the present utility model in conjunction with the accompanying drawings.

[0027] In the present technical solution, as Figure 1 shown, the radial roller sealing device for a rotary air preheater includes a trough body 1 and a sealing assembly 2.

[0028] As Figures 1-3 shown, the trough body 1 is an overall hollow rectangular box body for supporting the entire sealing device. The side surface of the trough body 1 is a set of corresponding short side parts and a set of long side parts.

[0029] Among them, a dust discharge groove 101 is opened on any one of the long side parts, and a first installation hole 102 is opened on any one of the short side parts; in addition, a bottom hole 103 is opened at the bottom of the trough body 1, and the bottom hole 103 is communicated with the dust discharge groove 101. A set of dust discharge holes are also opened on both sides of the bottom hole 103.

[0030] In the present utility model, the dust discharge groove 101 provided on the trough body 1 is communicated with the bottom hole 103, so that the flying ash dissipated here cannot accumulate, and the dust discharge holes on both sides of the bottom hole 103 can reduce the dust accumulation at the return air cavity inside the trough body 1.

[0031] In addition, asFigures 1-3 As shown, in the groove body 1, a through groove 104 is horizontally opened along the long side of the top of the groove body 1, and the through groove 104 communicates with the first mounting hole 102.

[0032] The sealing assembly 2 includes a sealing plate 201 slidably connected vertically inside the through groove 104. The width of the sealing plate 201 is the same as the width of the through groove 104, and the length of the sealing plate 201 is the same as the length of the through groove 104 and the length of the long side of the groove body 1.

[0033] In addition, a group of limiting shoulders 202 are symmetrically arranged on both sides of the bottom of the sealing plate 201 along its long side. When the bottom of the sealing plate 201 is placed in the through groove 104, the group of limiting shoulders 202 and the top of the body of the groove body 1 limit the sealing plate 201 from sliding vertically upward out of the through groove 104.

[0034] What is more important in the present utility model is that, as Figures 1-2 shown, an arc-shaped sealing portion 203 is provided at the top of the sealing plate 201, and two roller grooves 204 are also opened on the sealing portion 203. A roller 206 is rotatably connected in each roller groove 204 through a rotating shaft 205. Among them, a plurality of anti-slip grooves are uniformly provided on the cylindrical outer surface of the roller 206. The rolling direction of the roller 206 is perpendicular to the long side direction of the sealing plate 201, and the top tangent plane of the roller 206 is 2 mm higher than the top tangent plane of the sealing portion 203.

[0035] Based on the above embodiments, the present utility model is provided with rollers 206 on the sealing plate 201, and the top tangent plane of the rollers 206 is 2 mm higher than the top tangent plane of the sealing portion 203. Such a setting is intended that when the device is used, the part where the device fits with the heating surface can be changed from the sealing portion 203 to the rollers 206, changing the sliding contact to rolling contact, improving the service life of the sealing device, reducing the use cost of the device, reducing energy consumption, and reflecting the practicability of the present utility model.

[0036] The existence of the 2 mm height difference between the top tangent plane of the roller 206 and the top tangent plane of the sealing portion 203 is for the need of the structure to change the sliding contact to rolling contact. In the actual use process, the volume of the main body of the air preheater is large. Specifically, in the installation and use of each sealing device, the 2 mm gap error is completely within the error range of the structure use; in addition, wear-resistant coatings are provided on both the arc outer surface of the sealing portion 203 and the cylindrical outer surface of the roller 206. Such a setting also increases the service life of the device, and if the roller 206 is damaged during the use process, the sealing portion 203 can also achieve the sealing effect in a short time.

[0037] On this basis, as Figures 1-2As shown in the figure, the shape of the first mounting hole 102 matches the cross-sectional shapes of the sealing plate 201 and the limiting shoulders 202 on both sides of the bottom of the sealing plate 201. The sealing plate 201 is partially inserted into the groove body 1 through the first mounting hole 102. Among them, the length of a group of limiting shoulders 202 is less than the length of the groove body 1. That is, when the sealing plate 201 is partially inserted into the groove body 1, the sealing part 203 at the top of the sealing plate 201 and the roller 206 both extend out of the groove body 1 through the through groove 104. At the same time, a group of limiting shoulders 202 and the top of the body of the groove body 1 are used to limit the sealing plate 201 from sliding vertically upward out of the through groove 104.

[0038] In this technical solution, the working effect of the sealing device lies not only in the setting of the sealing plate 201, but also in using the spring mechanism 3 to provide an elastic movement basis for the sealing plate 201 in the vertical direction.

[0039] As Figures 2-4 shown, there are two groups of spring mechanisms 3. Each group of spring mechanisms 3 includes a mounting ring 301. The mounting ring 301 is arranged above the ash discharge hole in the groove body 1, and the mounting ring 301 communicates with the ash discharge hole. In addition, one end of a spring 302 is sleeved on the mounting ring 301, and the other end of the spring 302 is embedded in the bottom of the support seat 303. An installation column 304 is arranged at the top of the support seat 303, and the installation column 304 is cooperatively connected with a second mounting hole 305 preset at the bottom of the sealing plate 201.

[0040] Based on the above structure, when a group of limiting shoulders 202 are in contact and limited with the inner wall of the top of the groove body 1, the spring 302 is in a partially compressed state. When the spring 302 is in a fully compressed state, the sealing part 203 at the top of the sealing plate 201 is outside the groove body 1.

[0041] Based on the above embodiments, the sealing device provided by the present utility model has a structural basis for heat exchange sealing of the air preheater. That is, under the elastic force of the spring 302, the roller 206 on the sealing plate 2 is always in close contact with the heating surface of the air preheater to achieve a sealing effect.

[0042] In addition, in the present utility model, as Figure 4 shown, a weight reduction groove 207 is provided at the bottom of the sealing plate 201 to reduce the weight of the sealing plate 201 and prevent the service life of the spring 302 from being shortened.

[0043] In this technical solution, as Figures 2-3 shown, in the groove body 1, a group of long strip-shaped adjustment holes 105 are parallelly arranged on the long side corresponding to the ash discharge groove 101. The adjustment direction of the adjustment holes 105 is the vertical direction, and the adjustment distance of the adjustment holes is 5 cm. Such a setting enables the overall height of the sealing device to be adjusted with a maximum stroke of 5 cm on the basis of fixed installation, reflecting the practicability of the present utility model.

[0044] Specifically, when using the sealing device provided by the present utility model for heat exchange sealing of a rotary air preheater, after placing the spring mechanism 3 inside the trough body 1, on the basis of initially pressing the support seat 303, insert the sealing plate 201 into the through groove 104 of the trough body 1 through the first mounting hole 102, and make the mounting post 304 at the top of the support seat 303 cooperate with the second mounting hole 305 at the bottom of the sealing plate 201. Thus, the combined installation of the sealing device is completed. Then, install the sealing device on the rotor along the radial direction of the rotor through two long strip-shaped adjustment holes 105, so that when the rotor moves, the rollers 206 on the sealing plate 201 are in contact with the heating surface, and due to the existence of the spring mechanism 3, the rollers 206 are always in close contact with the heating surface when in contact, thereby achieving the sealing effect.

[0045] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A radial roller sealing device for a rotary air preheater, characterized in that: include: The trough body is used to support the entire sealing device. The trough body is a hollow rectangular box body as a whole. The side of the trough body is a group of short sides and a group of long sides arranged correspondingly. Any one of the long sides is provided with an ash discharge groove, and any one of the short sides is provided with a first mounting hole. In addition, a bottom hole is provided at the bottom of the trough body, the bottom hole is connected to the ash discharge groove, and a group of ash discharge holes are provided on both sides of the bottom hole. A through groove is provided horizontally along the long side of the top of the trough body, and the through groove is connected to the first mounting hole. A sealing assembly, comprising a sealing plate slidably connected to the inside of a through groove in a vertical direction, wherein the width of the sealing plate is the same as the width of the through groove, and the length of the sealing plate is the same as the length of the through groove and the length of the long side of the groove body. In addition, a group of limiting shoulders are symmetrically arranged on both sides of the bottom of the sealing plate along its long sides, and when the bottom of the sealing plate is placed in the through groove, a group of limiting shoulders and the top of the main body of the groove body limit the sealing plate from sliding vertically upward out of the through groove; an arc-shaped sealing portion is arranged at the top of the sealing plate, and two roller grooves are also arranged on the sealing portion, and a roller is rollingly connected to each of the roller grooves through a rotating shaft, wherein a plurality of anti-slip grooves are evenly arranged on the cylindrical outer surface of the roller, and the rolling direction of the roller is perpendicular to the long side direction of the sealing plate, and the top section of the roller is 2 mm higher than the top section of the sealing portion; On this basis, the sealing assembly also includes a spring mechanism that provides elastic force in the vertical direction for the sealing plate, and the spring mechanism is provided with two groups, each group of the spring mechanism includes a mounting ring, the mounting ring is arranged above the ash discharge hole in the trough body, and the mounting ring is connected with the ash discharge hole, in addition, one end of the spring is sleeved on the mounting ring, and the other end of the spring is embedded in the bottom of the support seat, and the top of the support seat is provided with a mounting column, and the mounting column is matched and connected with a second mounting hole preset at the bottom of the sealing plate; When a group of the limiting shoulders are in contact with the inner wall of the top body of the trough for limiting position, the spring is in a partially compressed state; when the spring is in a fully compressed state, the sealing portion at the top of the sealing plate is outside the trough.

2. The radial roller sealing device for a rotary air preheater according to claim 1 is characterized in that: In the trough body, a group of long strip-shaped adjustment holes are opened in parallel on the long side corresponding to the ash discharge trough, and the adjustment direction of the adjustment holes is the vertical direction.

3. The radial roller sealing device for a rotary air preheater according to claim 2, characterized in that: The adjustment distance of the adjustment hole is 5 cm.

4. The radial roller sealing device for a rotary air preheater according to claim 1, characterized in that: The shape of the first mounting hole matches the cross-sectional shape of the sealing plate and the limiting shoulders on both sides of the bottom of the sealing plate, and is used to partially insert the sealing plate into the groove body through the first mounting hole.

5. The radial roller sealing device for a rotary air preheater according to claim 4 is characterized in that: The bottom of the sealing plate is provided with a weight-reducing groove.

6. The radial roller sealing device for a rotary air preheater according to claim 5, characterized in that: The length of a group of the limiting shoulders is smaller than the length of the slot body.

7. The radial roller sealing device for a rotary air preheater according to claim 1, characterized in that: The arc outer surface of the sealing portion and the cylindrical outer surface of the roller are both provided with a wear-resistant coating.

Images