TWM577082U - Shaft seal structure - Google Patents

Abstract

A shaft seal structure is provided on an annular shaft seal body with a first side and a second side opposite to each other, and a spring portion extending obliquely toward the center in a funnel shape is disposed on the first side periphery. a central hole is formed in the center of the elastic piece portion, and the shaft sealing body is disposed on a guiding inclined surface of the middle portion of the rotating shaft having a thick and thin outer diameter portion, and the elastic piece is elastically attached to the guiding inclined surface, and the central portion is elastically attached to the guiding portion The hole is tightly bundled on the outer peripheral side of the thin outer diameter portion, and when the liquid or the rubber having the pressure acts on the elastic portion from the thin outer diameter portion toward the thick outer diameter portion, a force is generated to drive the elastic portion to be attached. The force on the guiding surface maintains a closer fit between the shrapnel portion and the guiding bevel to effectively prevent the liquid or rubber from seeping back from the circumferential side of the guiding bevel of the rotating shaft.

Description

Shaft seal structure

The present invention relates to a shaft seal structure, and more particularly to a shaft seal structure that can produce a tighter fit seal characteristic with an increase in pressure to effectively prevent fluid or glue from seeping along the surface of the shaft.

In various fields of application (such as injection molding devices) that directly drive or agitate a liquid (or rubber) in a container using a rotating shaft to produce an extrusion pressure, since the liquid (or rubber) has a certain pressure, and the shaft is kept in a rotating state, and the rotating shaft inevitably causes shaking and vibration. Therefore, how to make the shaft seal maintain a tight fit and seal in the rotating state of the rotating shaft, A topic that is highly valued by relevant industry players.

As shown in FIG. 1 , a schematic view of a shaft seal applied to a glue injection device is provided, and a through hole 30 is formed in a casing assembly 3 , and a shaft 20 is disposed in the hole 30; the hole 30 is provided. The driving space 33, the injection space 31 and the injection flow channel 32 are connected in sequence, and at least one feeding port 35 for introducing liquid or rubber is disposed on the side of the middle portion of the injection space 31. A discharge hole 34 is provided at one end of the injection flow path 32 away from the injection space 31.

The rotating shaft 20 is disposed in the hole 30 of the casing assembly 3, and has a connecting seat 24 at one end thereof for connecting to an external preset power source (not shown), and the other end of the rotating shaft 20 is A spiral portion 26 extending into the injection flow path 32 is joined.

At least one shaft seal 10 is disposed on a flat portion on the outer peripheral side of the middle portion of the rotating shaft 20, and the outer peripheral side of the shaft seal 10 is urged to a position between the driving space 33 and the injection space 31, and the inner peripheral side of the shaft seal 10 Then, the rotating shaft 20 is wrapped, so that a sealing structure is formed between the rotating shaft 20 and the hole 30.

However, when the rotating shaft 20 drives the spiral portion 26 to rotate to press the liquid or the rubber material in the injection flow channel 32 to generate pressure, the rotating shaft 20 is shaken and vibrated during operation, so that the rotating shaft 20 is caused. It is inevitable that a slight gap will be formed between the outer peripheral side and the inner peripheral side of the shaft seal 10; when the pressure of the liquid or rubber exceeds a predetermined threshold, part of the liquid or rubber will be injected by the material. The space 31 seeps into the driving space 33 through the small gap between the shaft seal 10 and the circumferential side of the rotating shaft 20, and then overflows to the power source or the outside of the casing assembly 3, causing pollution of related components or the environment. .

Moreover, with the long-term friction loss between the shaft seal 10 and the rotating shaft 20, the gap between the shaft seal 10 and the circumferential side of the rotating shaft 20 will gradually become larger, and the percolation of the liquid or rubber will gradually increase. Seriously, it may eventually affect the injection pressure of the liquid or compound in the injection flow path 32, so that the overall device cannot operate normally.

In view of the above-mentioned shortcomings in the application of the shaft seal structure, the creator has researched and improved the shortcomings of these shortcomings, and finally the creation of this creation.

The main purpose of the present invention is to provide a shaft seal structure which is provided on an annular shaft seal body with opposite first and second sides, and a peripheral edge of the first side is provided with a funnel-shaped oblique direction toward the center. a shrapnel portion, a central hole is formed in the center of the shrapnel portion, and the shaft seal body is assembled on a guide slope having a thick and thin outer diameter portion in a middle portion of the rotating shaft, and the bullet is used. The sheet portion is elastically attached to the guide inclined surface, and the central hole is tightly bundled on the outer peripheral side of the thin outer diameter portion, whereby the elastic piece portion can be simultaneously generated when subjected to the pressure of the preset liquid or the rubber material. a force applied to the guiding surface to maintain a tighter fit between the elastic portion of the shaft sealing body and the guiding surface of the rotating shaft to effectively prevent the liquid or rubber from passing through the shaft sealing body Seepage between the shafts.

In order to achieve the above object and effect, the technical means adopted by the present invention include: an annular shaft sealing body having opposite first and second sides, and a central portion of the first side is annularly oriented toward the center A shrapnel portion extending obliquely in a funnel shape, and a central hole is formed in the center of the shrapnel portion.

According to the above structural feature, a surface of the elastic piece toward the first side is provided with a slope, so that the elastic portion forms a structure in which the thickness is gradually reduced from the circumferential side toward the center.

According to the above structural feature, a side of the surface of the elastic piece adjacent to the second side is provided with a recessed space for absorbing the amount of deformation of the elastic portion of the elastic portion.

According to the above structural feature, an outer ring groove is recessed in the middle portion of the outer peripheral side of the shaft seal.

In order to achieve a more specific understanding of the above objectives, effects and features of this creation, the following figures are illustrated as follows:

1‧‧‧ shaft seal body

10‧‧‧ shaft seal

11‧‧‧ first side

12‧‧‧ second side

13‧‧‧Sports Department

131‧‧‧Bevel

14‧‧‧Central hole

15‧‧‧ recessed space

16‧‧‧ outer ring groove

2, 20‧‧‧ shaft

21‧‧‧Rough OD

22‧‧‧Small OD

23‧‧‧Bevel

231‧‧‧ ring groove

24‧‧‧Connecting Block

25‧‧‧ pivotal department

26‧‧‧Spiral Department

3‧‧‧shell assembly

30‧‧‧ holes

31‧‧‧Injection space

32‧‧‧ injection channel

33‧‧‧Drive space

34‧‧‧ discharge hole

35‧‧‧ Feed inlet

Figure 1 is a schematic diagram showing the application of the shaft seal.

Figure 2 is a three-dimensional appearance of the shaft seal of the present creation.

Figure 3 is a perspective view of the shaft seal of the present creation.

Figure 4 is a perspective exploded view of the shaft seal of the present invention in actual application and related components.

Figure 5 is a combined appearance of the shaft seal of the present invention in the actual application and related components.

Figure 6 is a side cross-sectional view of Figure 5.

Fig. 7 is an enlarged schematic view showing the X portion of Fig. 6.

The structure of the present invention includes an annular shaft seal body 1 having an opposite first side 11 and a second side 12 on the first side. The peripheral edge of the elliptical portion is formed with a central portion 14 formed in a funnel shape toward the center, and a central hole 14 is formed in the center of the elastic piece portion 13 , and a slope is formed on the surface of the elastic piece portion 13 facing the first side 11 . 131, the shrapnel portion 13 is formed into a structure in which the thickness is gradually reduced from the circumferential side toward the center.

A recessed space 15 is disposed on the side of the surface of the shrapnel portion 13 adjacent to the second side 12, and the recessed space 15 absorbs the deformation amount of the elastic portion of the elastic portion 13; and the outer peripheral side of the shaft seal body 1 is recessed There is an outer ring groove 16.

Referring to Figures 4 to 7, it can be seen that in the actual application, the shaft seal body 1 can be assembled with a shaft 2 in a casing assembly 3; wherein the casing assembly 3 is internally provided with a through-hole The hole 30 is composed of a drive space 33, a injection space 31 and a injection flow path 32 which are sequentially connected, and at least one medium for introducing liquid or rubber is provided in the middle of the injection space 31. The material port 35 is provided with a discharge hole 34 at one end of the injection flow path 32 away from the injection space 31.

The shaft 2 is disposed in the hole 30 of the sleeve assembly 3, and a middle portion of the shaft 2 is provided with a thick outer diameter portion 21 and a thin outer diameter portion 22, and the joint portions of the thick and thin outer diameter portions 21 and 22 are formed. The ring is provided with a guiding bevel 23, and at least one ring groove 231 can be disposed on the guiding bevel 23 as needed; In a possible embodiment, the thick outer diameter portion 21 can be connected to an external preset power source (not shown) output via a connecting base 24, and the thin outer diameter portion 22 can be connected via a pivot The portion 25 is coupled to a spiral portion 26 that extends into the injection flow path 32.

In the actual application, the shaft seal body 1 is assembled on the outer peripheral side of the guide inclined surface 23 of the rotating shaft 2, and is elastically attached to the guide inclined surface 23 by the elastic piece portion 13 (the inclined surface 131), and the central hole is 14 is tightly bundled on the outer peripheral side of the thin outer diameter portion 22, and an O-ring (not shown) can be fitted into the outer ring groove 16 to ensure the between the shaft seal body 1 and the inner wall of the hole 30. Since the elastic piece portion 13 has a structure that is tapered from the circumferential side toward the center, the elastic piece portion 13 is softer at a portion close to the central hole 14 and can be kept attached to the guide inclined surface 23 without being easily bounced. The state of the warp.

When the rotating shaft 2 is driven by the power source, the spiral portion 26 is pressed to press the liquid or the rubber material in the injection flow channel 32 to increase the pressure of the liquid or the rubber material and flow out through the discharge hole 34. The liquid or rubber pressure inside the injection flow path 32 and the injection space 31 rises and acts on the elastic piece portion 13, and the elastic piece portion 13 can be driven to increase the force attached to the guide inclined surface 23, and the inclined surface can be matched. The portion 131 is partially embedded in the ring groove 231 to form a tighter fit, so that the elastic piece portion 13 and the guide inclined surface 23 are closely adhered to effectively prevent the liquid or rubber in the injection space 31. The circumferential side of the rotating shaft 2 (the inclined surface 23) and the elastic portion 13 of the shaft sealing body 1 are reversely flowed into the driving space 33.

In summary, the creation of the shaft seal structure can be more closely attached to the surface of the shaft with the increase of internal pressure, so as to prevent the reverse penetration of fluid or rubber along the surface of the shaft, which is novel and progressive. Creation.

Claims (4)

A shaft seal structure comprising: an annular shaft seal body having opposite first and second sides, and a spring portion extending toward the center in a funnel shape obliquely toward the center of the first side A central hole is formed in the center of the shrapnel portion. The shaft seal structure according to claim 1, wherein a surface of the elastic piece facing the first side is provided with a slope so that the elastic piece portion has a structure in which the thickness is gradually reduced from the circumferential side toward the center. The shaft seal structure of claim 1, wherein the side portion of the side of the shrapnel portion adjacent to the second side is provided with a recessed space for absorbing the amount of deformation of the elastic portion of the shrapnel portion. The shaft seal structure according to claim 1, wherein an outer ring groove is recessed in a middle portion of the outer peripheral side of the shaft seal.