Spiral shaft sealing device of vacuum drying machine

Abstract

The utility model discloses a spiral shaft sealing device of a vacuum dryer. The spiral shaft sealing device comprises a dryer shell, a spiral shaft and a sealing device body. The sealing device comprises a mounting seat, the top surface of the mounting seat is connected with a sealing top through a flange, the sealing top is a convex hollow cylinder, the hollow part of the sealing top is the inner diameter of the through pipe, the outer ring of the bottom end of the sealing top is of a flange design, and a sealing groove is formed in the middle of the bottom surface of the sealing top and is of a concave-convex labyrinth structure; a sealing shaft sleeve is arranged in the sealing groove in a matched mode. The outer contour of the top end of the sealing shaft sleeve is accurately matched with the sealing groove, the inner diameter of the sealing shaft sleeve is consistent with the radius of the inner diameter of the through pipe, a limiting concave ring is arranged at the bottom end of the sealing shaft sleeve along the inner diameter, and a concave ring protrusion is arranged on the limiting concave ring; according to the device, the vacuum retentivity is improved, the sealing reliability is enhanced, and leakage and abrasion are reduced.

Description

Technical Field

[0001] This utility model belongs to the field of equipment sealing technology, specifically relating to a sealing device for the spiral shaft of a vacuum dryer. Background Technology

[0002] In a dryer, the spiral shaft needs to pass through the dryer shell to transfer materials, while the inside of the dryer needs to maintain a sealed drying environment to ensure that the materials are dried efficiently under low pressure and no moisture conditions.

[0003] Existing dryers typically employ a simple single-layer seal design for their spiral shaft seals, such as a single rubber ring seal or packing seal, which offers limited sealing performance. After prolonged operation, the seals are prone to wear, aging, or deformation due to material particle friction, temperature changes, and vacuum pressure. This allows outside air and moisture to enter the dryer, leading to reduced drying efficiency and material deterioration due to moisture absorption.

[0004] Therefore, there is an urgent need for a sealing device for the spiral shaft of a vacuum dryer to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a sealing device for the spiral shaft of a vacuum dryer to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a vacuum dryer spiral shaft sealing device, including a dryer shell, a spiral shaft and a sealing device.

[0007] The present invention further describes that the sealing device includes a mounting base, the top surface of which is connected to a sealing top via a flange, the sealing top being a convex hollow cylinder, the hollow portion of which is the inner diameter of the through pipe, the outer ring of the bottom end of the sealing top being a flange design, and a sealing groove being provided in the middle of the bottom surface of the sealing top, the sealing groove being a concave-convex labyrinth structure; a sealing bushing is fitted inside the sealing groove.

[0008] This utility model further illustrates that the outer contour of the top of the sealing bushing is precisely matched with the sealing groove, the inner diameter of the sealing bushing is consistent with the inner diameter radius of the through pipe, and the bottom end of the sealing bushing is provided with a limiting concave ring along the inner diameter, and the limiting concave ring has a concave ring protrusion.

[0009] The present invention further describes that the mounting base is a double-layer equal-diameter flange structure, the bottom flange of the mounting base is fixedly connected to the dryer shell by bolts, and a sealing rubber gasket is provided between the bottom surface of the mounting base and the fixed surface of the dryer shell; a sealing recess is provided on the top surface of the mounting base, and a sealing gasket is embedded in the sealing recess.

[0010] The present invention further explains that the outer wall of the dryer housing is provided with a through shaft hole, and the sealing device is coaxially installed with the through shaft hole.

[0011] This utility model further illustrates that the spiral shaft is designed in segments, with a thick section in the middle and thin sections at both ends, and a limiting protrusion is provided at the transition between the thick and thin sections.

[0012] This utility model further illustrates that the spiral shaft is coaxially installed in the sealing device, the limiting protrusion is embedded in the concave ring protrusion, and the thin section and the inner diameter of the sealing shaft sleeve are filled with sealing gaskets to achieve a sealing fit.

[0013] Compared with the prior art, the beneficial effects achieved by this utility model are as follows: This utility model adopts a precise fit between the concave-convex labyrinth-type sealing groove and the sealing bushing to form a tortuous sealing path, which effectively improves vacuum retention; the mounting seat with a double-layer flange structure combined with sealing rubber gaskets and washers enhances sealing reliability; the segmented design of the spiral shaft and the fitting of the limiting protrusion and the concave ring protrusion achieve axial positioning and radial sealing, reduce material leakage and wear, and extend the service life of the equipment. Attached Figure Description

[0014] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a partial structural schematic diagram of the present invention;

[0017] Figure 3 This is a partial structural schematic diagram of the present invention;

[0018] Figure 4 This is an exploded structural diagram of the sealing device of this utility model;

[0019] Figure 5 This is a schematic diagram of the sealing top structure of this utility model;

[0020] In the diagram: 1. Dryer outer shell; 11. Through shaft hole; 2. Spiral shaft; 21. Coarse section; 22. Fine section; 23. Limiting protrusion; 3. Sealing device; 31. Mounting base; 311. Sealing concave ring; 32. Sealing top; 321. Inner diameter of through pipe; 322. Sealing groove; 33. Sealing bushing; 331. Limiting concave ring; 332. Concave ring protrusion. Detailed Implementation

[0021] The following detailed, non-limiting description of the present invention, in conjunction with preferred embodiments and accompanying drawings, is provided. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] Please see Figure 1-5 The present invention provides a technical solution: a sealing device for a spiral shaft of a vacuum dryer, comprising a dryer housing 1, a spiral shaft 2, and a sealing device 3; the sealing device 3 includes a mounting base 31; the mounting base 31 is a double-layer equal-diameter flange structure, the bottom flange of the mounting base 31 is fixedly connected to the dryer housing 1 by bolts, and a sealing rubber gasket is provided between the bottom surface of the mounting base 31 and the fixed surface of the dryer housing 1; a sealing recess 311 is provided on the top surface of the mounting base 31, and a sealing ring is embedded in the sealing recess 311.

[0023] The top surface of the mounting base 31 is connected to the sealing top 32 via a flange. The sealing top 32 is a convex hollow cylinder. The hollow part of the sealing top 32 is the inner diameter of the through pipe 321. The outer ring of the bottom end of the sealing top 32 is a flange design. A sealing groove 322 is provided in the middle of the bottom surface of the sealing top 32. The sealing groove 322 has a concave-convex labyrinth structure, forming a tortuous sealing path. A sealing bushing 33 is fitted inside the sealing groove 322.

[0024] The outer contour of the top of the sealing bushing 33 is precisely matched with the sealing groove 322. The inner diameter of the sealing bushing 33 is consistent with the radius of the inner diameter 321 of the through pipe. The bottom end of the sealing bushing 33 is provided with a limiting concave ring 331 along the inner diameter. The limiting concave ring 331 has a concave ring protrusion 332.

[0025] The outer wall of the dryer housing 1 is provided with a through shaft hole 11, and the sealing device 3 is coaxially installed with the through shaft hole 11.

[0026] The spiral shaft 2 is designed in segments, with a thick section 21 in the middle and thin sections 22 at both ends. A limiting protrusion 23 is provided at the transition between the thick section 21 and the thin section 22.

[0027] The spiral shaft 2 is coaxially installed in the sealing device 3, the limiting protrusion 23 is embedded in the concave ring protrusion 332, and the thin section 22 and the inner diameter of the sealing shaft sleeve 33 are filled with sealing gaskets to achieve a sealing fit.

[0028] Working principle:

[0029] The spiral shaft 2 and the sealing device 3 are connected by a limiting protrusion 23 embedded in the concave ring protrusion 332 of the sealing sleeve 33, forming a rigid sealing connection. When the spiral shaft 2 rotates, it drives the sealing device 3 to rotate synchronously.

[0030] The sealing groove 322 on the bottom surface of the sealing top 32 adopts a concave-convex labyrinth structure, which precisely matches the outer contour of the top of the sealing bushing 33. During rotation, it forms a tortuous sealing path, which blocks gas leakage through the labyrinth effect. At the same time, the double-layer flange structure of the mounting base 31, together with the sealing rubber gasket and sealing washer, strengthens the tightness of the sealing surface during static installation. This dynamic connection reduces wear compared with the traditional single rubber ring seal.

[0031] The coarse section 21 and the fine section 22 of the spiral shaft 2 are designed in segments. The limiting protrusion 23 and the limiting concave ring 331 of the sealing sleeve 33 cooperate to ensure axial positioning accuracy. The fine section 22 and the inner diameter of the sealing sleeve 33 are filled with sealing gaskets to achieve radial dynamic sealing, and finally form a composite sealing system that combines dynamic and static elements.

[0032] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A sealing device for a screw shaft of a vacuum drier, comprising a drier housing (1), a screw shaft (2) and a sealing device (3), characterized in that: The sealing device (3) includes a mounting base (31), the top surface of which is connected to a sealing top (32) via a flange. The sealing top (32) is a convex hollow cylinder. The hollow part of the sealing top (32) is the inner diameter (321) of the through pipe. The outer ring of the bottom end of the sealing top (32) is a flange design. A sealing groove (322) is provided in the middle of the bottom surface of the sealing top (32). The sealing groove (322) has a concave-convex labyrinth structure. A sealing bushing (33) is fitted inside the sealing groove (322).

2. A screw shaft sealing device for a vacuum dryer according to claim 1, characterized in that: The outer contour of the top end of the sealing bushing (33) is precisely matched with the sealing groove (322). The inner diameter of the sealing bushing (33) is consistent with the radius of the inner diameter (321) of the through pipe. The bottom end of the sealing bushing (33) is provided with a limiting concave ring (331) along the inner diameter. The limiting concave ring (331) is provided with a concave ring protrusion (332).

3. A screw shaft sealing device for a vacuum dryer according to claim 2, characterized in that: The mounting base (31) is a double-layer equal diameter flange structure. The bottom flange of the mounting base (31) is fixedly connected to the dryer shell (1) by bolts. A sealing rubber gasket is provided between the bottom surface of the mounting base (31) and the fixed surface of the dryer shell (1). A sealing concave ring (311) is opened on the top surface of the mounting base (31), and a sealing gasket is embedded in the sealing concave ring (311).

4. A screw shaft sealing device for a vacuum dryer according to claim 3, characterized in that: The outer wall of the dryer housing (1) is provided with a through shaft hole (11), and the sealing device (3) is coaxially installed with the through shaft hole (11).

5. A screw shaft sealing arrangement for a vacuum dryer as claimed in claim 4, wherein: The spiral shaft (2) is designed in segments. The middle part of the spiral shaft (2) is a thick section (21), and the two ends of the spiral shaft (2) are thin sections (22). A limiting protrusion (23) is provided at the transition between the thick section (21) and the thin section (22).

6. A screw shaft sealing arrangement for a vacuum dryer according to claim 5, characterized in that: The spiral shaft (2) is coaxially installed in the sealing device (3), the limiting protrusion (23) is embedded in the concave ring protrusion (332), and the thin section (22) and the inner diameter of the sealing bushing (33) are filled with sealing gaskets to achieve a sealing fit.

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