Elastic sealing device

Abstract

The utility model belongs to the technical field of sealing, and particularly discloses an elastic sealing device which comprises a connecting flange, a sealing assembly, a sealing body, a shaft sleeve and a locking piece. The shaft sleeve sleeves the periphery of the main shaft; the connecting flange is fixed on a fan shell side plate; the shaft sleeve and the main shaft can penetrate through a central hole of the connecting flange; the sealing body is fixed to the side, away from the fan shell side plate, of the connecting flange. The shaft sleeve and the main shaft can penetrate through a center hole of the sealing body. A mounting hole for mounting the sealing assembly is formed in a center hole of the sealing body, and the locking piece is used for locking the shaft sleeve on the main shaft; the sealing assembly comprises an oil-immersed graphite packing and an annular spring, the oil-immersed graphite packing is located in the installation hole, an annular groove is formed in the periphery of the oil-immersed graphite packing, and the annular spring is installed in the annular groove and used for pressing the oil-immersed graphite packing on the shaft sleeve. The oil immersed graphite packing can be effectively and tightly attached to the shaft sleeve through the fixing and pressing effects of the annular spring, and therefore a very good sealing effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to sealing technical field, especially relate to a elastic sealing device. BACKGROUND

[0002] Centrifugal fan is a kind of fan that relies on mechanical energy to pressurize gas and discharge the pressurized gas.Centrifugal fan is widely used for ventilation, dust removal and cooling in factories, mines, tunnels, cooling towers, vehicles, ships and buildings, and for ventilation and air induction in boilers and industrial furnaces.In the process of manufacturing products such as chemical fibers and pharmaceuticals, various toxic, harmful and corrosive waste gases may be generated, which need to be transported to a treatment center for treatment by using a sealed pipeline with a centrifugal fan.In the process of transportation by the centrifugal fan, if the waste gas leaks from the shaft center sealing position, it will seriously threaten the health of the workers and affect the environment.In order to prevent the waste gas from leaking from the connection between the main shaft and the casing of the centrifugal fan, the centrifugal fan used in the chemical machinery field has very strict requirements for the sealing performance of the shaft center sealing position. SUMMARY

[0003] The utility model discloses a kind of elastic sealing devices, and the fixed and compression effect of annular spring can effectively make oil-immersed graphite packing and shaft sleeve closely adhere, to play very good sealing effect.

[0004] In order to achieve the above purpose, the technical scheme of the utility model is as follows: an elastic sealing device, comprising a connecting flange, a sealing assembly, a sealing body, a shaft sleeve and a locking member; the shaft sleeve is sleeved on the outer periphery of the main shaft; the connecting flange is fixed on the side plate of the fan casing; the shaft sleeve and the main shaft can pass through the center hole of the connecting flange; the sealing body is fixed on the side of the connecting flange away from the side plate of the fan casing; the shaft sleeve and the main shaft can pass through the center hole of the sealing body; the center hole of the sealing body is provided with a mounting hole for mounting the sealing assembly; the locking member is used to lock the shaft sleeve on the main shaft; the sealing assembly comprises an oil-immersed graphite packing and an annular spring; the oil-immersed graphite packing is located in the mounting hole; the outer periphery of the oil-immersed graphite packing is provided with an annular groove; and the annular spring is installed in the annular groove and used to press the oil-immersed graphite packing on the shaft sleeve.

[0005] Further, the sealing body comprises an upper sealing body member and a lower sealing body member; and the upper sealing body member and the lower sealing body member are detachably connected.

[0006] Further, the upper sealing body member and the lower sealing body member are positioned by positioning stops.

[0007] Further, the upper sealing body part or the lower sealing body part is provided with a fixed gap, and the fixed gap of the upper sealing body part or the lower sealing body part is provided with a first connecting hole, and the lower sealing body part or the upper sealing body part is provided with a second connecting hole corresponding to the first connecting hole, and the first connecting part fixes the upper sealing body part and the lower sealing body part through the first connecting hole and the second connecting hole.

[0008] Further, the outer periphery of the sealing body is provided with a fourth connecting hole corresponding to a third connecting hole on the connecting flange, and the second connecting part fixes the connecting flange and the sealing body through the third connecting hole and the fourth connecting hole.

[0009] Further, a sealing gasket is installed between the connecting flange and the sealing body.

[0010] Further, the inside of the shaft sleeve is provided with a two-stage trapezoidal hole, the large-diameter end of the two-stage trapezoidal hole is close to the fan shell side plate, the main shaft is provided with a three-stage step, the small-diameter end of the three-stage step is located away from the fan shell side plate, the small-diameter end of the three-stage step is provided with an external thread, the two-stage trapezoidal hole matches the large-diameter end and the middle section of the three-stage step, and the locking part adopts a nut matched with the external thread.

[0011] Further, the sealing assembly and the mounting hole are respectively provided with two groups, and the two groups of mounting holes are arranged along the axial direction of the main shaft.

[0012] Further, the shaft sleeve and the main shaft are transitionally matched.

[0013] The beneficial effects of the technical scheme are:

[0014] ①The oil-immersed graphite packing can be tightly held on the shaft sleeve and tightly attached to the inside of the mounting hole of the sealing body due to the fixing and pressing effect of the annular spring. When the oil-immersed graphite packing is worn and deformed due to long-time operation of the fan, the oil-immersed graphite packing can be tightly attached to the shaft sleeve due to the fixing and pressing effect of the annular spring, thereby achieving very good sealing effect.

[0015] ②The two groups of sealing assemblies can enhance the sealing effect, and when one group of sealing assemblies fails, the other group of sealing assemblies can still achieve sealing effect.

[0016] ③The shaft sleeve is fixed and limited in the axial direction by the nut.

[0017] ④The upper sealing body part and the lower sealing body part are positioned by the positioning stop, which can ensure accurate installation of the upper sealing body part and the lower sealing body part. The fixed gap is provided to facilitate the fixation of the first connecting part to the upper sealing body part and the lower sealing body part. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of an elastic sealing device according to the present invention;

[0019] Figure 2 for Figure 1 Side view;

[0020] Figure 3 for Figure 1 Front and side views of the upper and middle sealing components;

[0021] Figure 4 for Figure 1 Front and side views of the lower sealing component;

[0022] Figure 5 for Figure 1 Schematic diagram of the middle connecting flange;

[0023] Figure 6 for Figure 1 Front and side views of oil-impregnated graphite packing;

[0024] Figure 7 for Figure 1 Schematic diagram of the central bushing;

[0025] Figure 8 for Figure 1 A schematic diagram of the locking mechanism. Detailed Implementation

[0026] The following detailed description illustrates the specific implementation method:

[0027] The reference numerals in the accompanying drawings include: main shaft 1, fan housing side plate 2, connecting flange 3, sealing body 4, sealing gasket 5, second connecting piece 6, bushing 7, locking piece 8, sealing assembly 9, oil-impregnated graphite packing 10, ring spring 11, first connecting piece 12, fixing notch 13, first connecting hole 14, second connecting hole 15, positioning stop 16, fourth connecting hole 17, third connecting hole 18, annular groove 19, mounting hole 20, upper sealing body 21, and lower sealing body 22.

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] The basic implementation examples are as follows: Figures 1-8 As shown: A resilient sealing device, such as Figure 1 , 2As shown, it comprises a connecting flange 3, a sealing assembly 9, a sealing body 4, a shaft sleeve 7 and a locking piece 8; the shaft sleeve 7 is sleeved on the outer periphery of the main shaft 1, and the shaft sleeve 7 is transitionally fitted with the main shaft 1. The connecting flange 3 is welded and fixed on the fan shell side plate 2, and the shaft sleeve 7 and the main shaft 1 can pass through the center hole of the connecting flange 3; the sealing body 4 is fixed on the side of the connecting flange 3 away from the fan shell side plate 2, and a sealing gasket 5 is installed between the connecting flange 3 and the sealing body 4. The shaft sleeve 7 and the main shaft 1 can pass through the center hole of the sealing body 4. As shown in Figure 3 , 4 As shown, the center hole of the sealing body 4 is provided with a mounting hole 20 for mounting the sealing assembly 9, and the locking piece 8 is used to lock the shaft sleeve 7 on the main shaft 1. The sealing assembly 9 comprises an oil-impregnated graphite packing 10 and an annular spring 11, the oil-impregnated graphite packing 10 is located in the mounting hole 20, and the outer periphery of the oil-impregnated graphite packing 10 is provided with an annular groove 19 (as shown in Figure 6 The annular spring 11 is installed in the annular groove 19 and is used to press the oil-impregnated graphite packing 10 on the shaft sleeve 7. The sealing assembly 9 and the mounting hole 20 are respectively provided with two groups, and the two groups of mounting holes 20 are arranged along the axial direction of the main shaft 1. The outer circle smoothness of the shaft sleeve 7 is ensured, thereby reducing the wear of the oil-impregnated graphite packing 10 during operation.

[0030] As shown in Figure 3 , 4 The sealing body 4 comprises an upper sealing body 21 and a lower sealing body 22, and the upper sealing body 21 and the lower sealing body 22 are detachably connected. The upper sealing body 21 and the lower sealing body 22 are positioned by the positioning stop 16. The upper sealing body 21 or the lower sealing body 22 is provided with a fixed notch 13, the fixed notch 13 of the upper sealing body 21 or the lower sealing body 22 is provided with a first connecting hole 14, the lower sealing body 22 or the upper sealing body 21 is provided with a second connecting hole 15 corresponding to the first connecting hole 14, and the first connecting piece 12 fixes the upper sealing body 21 and the lower sealing body 22 through the first connecting hole 14 and the second connecting hole 15. In this embodiment, the fixed notch 13 is arranged on the upper sealing body 21, the first connecting hole 14 is arranged on the fixed notch 13, the second connecting hole 15 is arranged on the lower sealing body 22, the first connecting piece 12 is a bolt, the second connecting hole 15 is a threaded hole, and the bolt is threadedly connected with the threaded hole after passing through the first connecting hole 14.

[0031] As shown in Figures 3-5 The sealing body 4 adopts a convex structure, the outer periphery of the bottom of the sealing body 4 is provided with a fourth connecting hole 17 corresponding to a third connecting hole 18 on the connecting flange 3, and the second connecting piece 6 fixes the connecting flange 3 and the sealing body 4 through the third connecting hole 18 and the fourth connecting hole 17. The third connecting hole 18 is a threaded hole, the second connecting piece 6 is a bolt, the bolt is threadedly connected with the threaded hole after passing through the fourth connecting hole 17, and a gasket is arranged between the bolt and the sealing body 4.

[0032] As Figure 7 shown, the inside of the shaft sleeve 7 is provided with a two-stage trapezoidal hole, the large-diameter end of the two-stage trapezoidal hole is close to the fan shell side plate 2, the main shaft 1 is provided with a three-stage step, the small-diameter end of the three-stage step is located away from the fan shell side plate 2; the small-diameter end of the three-stage step is provided with an external thread, the two-stage stepped hole matches the large-diameter end and the middle section of the three-stage step; the locking piece 8 adopts a nut matched with the external thread, and the nut can press the shaft sleeve 7 on the main shaft 1.

[0033] It should be noted that, in this text, relational terms such as first and second are used merely to distinguish one entity or action from another, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus including a series of elements includes not only those elements, but also other elements not explicitly listed or inherent to such a process, method, article or apparatus.

[0034] The above is only an embodiment of the present application, and the common knowledge of specific structures and properties in the scheme is not described in detail, the ordinary skilled in the art knows all the ordinary technical knowledge in the technical field of the present application before the filing date or the priority date, can know all the prior art in the field and has the ability to apply conventional experimental means before that date, the ordinary skilled in the art can improve and implement the present scheme under the inspiration of this application, some typical known structures or known methods should not be an obstacle for the ordinary skilled in the art to implement the present application. It should be pointed out that, for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, which will not affect the effect and practicality of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like in the specification can be used to explain the content of the claims.

Claims

1. An elastomeric sealing device, characterized by: The utility model provides a sealing structure of fan shaft, including connecting flange (3), sealing assembly (9), sealing body (4), shaft sleeve (7) and locking piece (8), the shaft sleeve (7) is set in the outer periphery of main shaft (1), the connecting flange (3) is fixed on the fan casing side plate (2), the shaft sleeve (7) and main shaft (1) can pass through the center hole of connecting flange (3), the sealing body (4) is fixed on the side of connecting flange (3) away from the fan casing side plate (2), the shaft sleeve (7) and main shaft (1) can pass through the center hole of sealing body (4), the center hole of sealing body (4) is equipped with the mounting hole (20) for installing sealing assembly (9), the locking piece (8) is used for locking the shaft sleeve (7) on main shaft (1), sealing assembly (9) includes oil immersion graphite packing (10) and annular spring (11), the oil immersion graphite packing (10) is located in the mounting hole (20), the outer periphery of oil immersion graphite packing (10) is equipped with annular groove (19), and annular spring (11) is installed in annular groove (19) and is used for pressing oil immersion graphite packing (10) on the shaft sleeve (7).

2. An elastomeric seal as claimed in claim 1, wherein: The sealing body (4) comprises an upper sealing body part (21) and a lower sealing body part (22), and the upper sealing body part (21) and the lower sealing body part (22) are detachably connected.

3. An elastomeric seal as claimed in claim 2, wherein: The upper sealing body part (21) and the lower sealing body part (22) are positioned by a positioning stop (16).

4. A resilient sealing device according to claim 2, wherein: The upper sealing body part (21) or the lower sealing body part (22) is provided with a fixing notch (13), the fixing notch (13) on the upper sealing body part (21) or the lower sealing body part (22) is provided with a first connecting hole (14), the lower sealing body part (22) or the upper sealing body part (21) is provided with a second connecting hole (15) corresponding to the first connecting hole (14), and a first connecting piece (12) fixes the upper sealing body part (21) and the lower sealing body part (22) through the first connecting hole (14) and the second connecting hole (15).

5. A resilient sealing device according to claim 1, wherein: The outer periphery of the sealing body (4) is provided with a fourth connecting hole (17) corresponding to a third connecting hole (18) on the connecting flange (3), and a second connecting piece (6) fixes the connecting flange (3) and the sealing body (4) through the third connecting hole (18) and the fourth connecting hole (17).

6. A resilient sealing device according to claim 1, wherein: A sealing gasket (5) is installed between the connecting flange (3) and the sealing body (4).

7. A resilient sealing device according to claim 1, wherein: The inside of the shaft sleeve (7) is provided with a two-stage trapezoidal hole, the large-diameter end of the two-stage trapezoidal hole is close to the fan casing side plate (2), the main shaft (1) is provided with a three-stage step, the small-diameter end of the three-stage step is located on the side away from the fan casing side plate (2), the small-diameter end of the three-stage step is provided with an external thread, the two-stage trapezoidal hole matches the large-diameter end and the middle section of the three-stage step, the locking piece (8) adopts a nut matched with the external thread, and the nut can press the shaft sleeve (7) on the main shaft (1).

8. A resilient sealing device according to claim 1, wherein: The sealing assembly (9) and the mounting hole (20) are respectively provided with two groups, and the two groups of mounting holes (20) are arranged along the axial direction of the main shaft (1).

9. A resilient sealing device according to claim 1, wherein: The shaft sleeve (7) and the main shaft (1) are transitionally matched.

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