A kind of filler dustproof structure

Abstract

The utility model relates to the field of dust prevention of valve packing, specifically a dust prevention structure of packing, including an upper sleeve and a lower sleeve, the lower end of the upper sleeve is provided with a circular ring protruding inward, the upper end of the lower sleeve is located in the upper sleeve and at least two protrusions are provided on the outer side of its upper end for preventing the lower sleeve from being separated from the upper sleeve, the outer diameter of the lower sleeve is matched with the inner hole clearance of the circular ring and its lower end extends out of the circular ring, the inner side of the circular ring is provided with a notch 2 for the protrusion to pass through, the protrusion is staggered with the notch 2 and placed on the circular ring. The utility model is easy to install and disassemble, and can play the role of dust prevention for packing and valve stem, through the structural design of the upper sleeve and the lower sleeve, only the lower sleeve needs to be rotated to stagger the protrusion with the notch 2, and the installation between the upper sleeve and the lower sleeve can be quickly completed, and only the lower sleeve needs to be rotated to make the protrusion pass through the notch 2, so that the lower sleeve can be quickly separated from the upper sleeve, and the disassembly can be completed quickly, and the operation efficiency is high.

Description

Technical Field

[0001] The utility model relates to the field of dust prevention of valve packing, in particular to a dust prevention structure of packing. Background Art

[0002] Currently, valves generally do not have a dust-proof structure between the valve stem and the packing. Therefore, dust and other impurities will enter the packing from the gap between the valve stem and the packing gland, scratching the valve stem during the lifting or rotation of the valve stem, causing the packing seal to fail, and even causing the valve to get stuck or malfunction.

[0003] In the prior art, dust is prevented by providing a sealing ring between the valve stem and the packing gland. However, during the lifting or rotation of the valve stem, the sealing ring will rub against the valve stem, causing wear, which will lead to sealing failure in the long run.

[0004] Therefore, there is an urgent need for a packing dust-proof structure that is convenient to install and disassemble. Utility Model Content

[0005] The purpose of the utility model is to provide a packing dust-proof structure, which is easy to install and disassemble and can play the role of dust-proof for the packing and the valve stem. Through the structural design of the upper sleeve and the lower sleeve, it is only necessary to rotate the lower sleeve so that the protrusion and the second notch are staggered, and the installation between the upper sleeve and the lower sleeve can be quickly completed. Moreover, it is only necessary to rotate the lower sleeve so that the protrusion passes through the second notch, so that the lower sleeve can be quickly separated from the upper sleeve, and the disassembly can be completed quickly, and the operation efficiency is high.

[0006] In order to solve the above technical problems, the utility model provides a packing dust-proof structure, including an upper sleeve and a lower sleeve, the lower end of the upper sleeve is provided with a circular ring protruding inward, the upper end of the lower sleeve is located inside the upper sleeve and at least two protrusions are provided on the outer side of its upper end for preventing the lower sleeve from separating from the upper sleeve, the outer diameter of the lower sleeve is matched with the inner hole clearance of the circular ring and the lower end thereof extends out of the circular ring, the inner side of the circular ring is provided with two notches for the protrusion to pass through, and the protrusion is staggered with the two notches and placed on the circular ring.

[0007] Furthermore, it also includes a sealing ring, which is arranged in the upper sleeve and its bottom surface is in contact with the circular ring. The inner ring of the sealing ring is provided with a notch that runs through its upper and lower surfaces. Each of the protrusions is respectively located in the notch one that matches it, and the lower sleeve is rotated to drive the notch one to be staggered with the notch two.

[0008] Furthermore, the size of the gap 1 is the same as that of the gap 2.

[0009] Furthermore, the outer diameter of the sealing ring and the inner hole of the upper sleeve, as well as the inner diameter of the sealing ring and the outer diameter of the lower sleeve are transitionally matched.

[0010] Furthermore, the protrusion is gap-matched with the first notch or the second notch.

[0011] Furthermore, the packing dustproof structure is sleeved on the outside of the valve stem and located above the packing gland, the top of the upper sleeve is welded to the valve electric connecting plate, and the bottom of the lower sleeve is welded to the packing gland.

[0012] Furthermore, the number of the protrusions is two, the two protrusions are symmetrically arranged relative to the center of the upper sleeve, and the straight-line distance between the outer ends of the two protrusions is greater than the inner diameter of the ring.

[0013] Furthermore, the number of the protrusions is more than two and they are distributed in a circle on the outer side of the upper end of the lower sleeve.

[0014] The beneficial effects of the utility model are:

[0015] 1. The utility model is easy to install and disassemble, and can prevent dust from the packing and the valve stem. Through the structural design of the upper sleeve and the lower sleeve, the installation between the upper sleeve and the lower sleeve can be quickly completed by rotating the lower sleeve so that the protrusion is staggered with the second notch, and the protrusion can pass through the second notch so that the lower sleeve can be quickly separated from the upper sleeve, and the disassembly can be quickly completed with high operating efficiency.

[0016] 2. The utility model can make the structure between the upper sleeve, the sealing ring and the lower sleeve more compact through the design of the sealing ring, and can drive the sealing ring to cover the second gap by rotating the lower sleeve, thereby improving the dustproof effect.

[0017] 3. When the utility model is installed on the valve, space can be reserved for the packing gland to press the packing downward. When the packing is slightly worn, there is no need to disassemble the packing dustproof structure of the utility model. By tightening the nut on the packing gland and adjusting the packing gland to press the packing downward, the packing gland, packing, valve stem and valve body can be sealed again, which plays a certain role in emergency maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a structural schematic diagram of the filler dust-proof structure of Example 1 of the utility model;

[0020] Figure 2 is a top view of the upper sleeve of Example 1 of the utility model;

[0021] Figure 3 is a cross-sectional view of an upper sleeve of Embodiment 1 of the present utility model;

[0022] Figure 4 is a top view of the sealing ring of Example 1 of the utility model;

[0023] Figure 5 is a cross-sectional view of the sealing ring of Example 1 of the utility model;

[0024] Figure 6 is a top view of the lower sleeve of Example 1 of the utility model;

[0025] Figure 7 is a cross-sectional view of the lower sleeve of Example 1 of the utility model;

[0026] Figure 8 It is a specific application diagram of Example 1 of the utility model;

[0027] In the figure: 1-upper sleeve, 2-sealing ring, 3-lower sleeve, 4-valve stem, 5-valve electric connecting plate, 6-packing gland, 11-ring, 111-notch 2, 21-notch 1, 31-protrusion. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings of the utility model specification to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] Example 1

[0030] like Figure 1-7 As shown, a packing dustproof structure comprises an upper sleeve 1, a sealing ring 2 and a lower sleeve 3. The lower end of the upper sleeve 1 is provided with an inwardly protruding ring 11, and the inner side of the ring 11 is provided with a notch 111 (such as Figure 2-3 shown);

[0031] The sealing ring 2 is arranged in the upper sleeve 1 and its bottom surface is in contact with the circular ring 11. The inner ring of the sealing ring 2 is provided with a notch 21 (such as Figure 4-5 shown);

[0032] The upper end of the lower sleeve 3 is located inside the upper sleeve 1 and at least two protrusions 31 (such as Figure 6-7As shown), specifically, here it means that the protrusion 31 is staggered with the second notch 111, and the lower sleeve 3 cannot pass downward from the second notch 111, that is, the lower sleeve 3 is not separated from the upper sleeve 1; in this embodiment, the number of protrusions 31 is set to two, and the two protrusions 31 are symmetrically arranged relative to the center of the upper sleeve 1, and the straight-line distance between the outer ends of the two protrusions 31 is greater than the inner diameter of the ring 11. Of course, in other embodiments, the number of protrusions 31 can be designed to be more than two and they are circumferentially distributed on the outer side of the upper end of the lower sleeve 3.

[0033] like Figure 1 As shown, the outer diameter of the lower sleeve 3 is matched with the inner hole clearance of the ring 11 and its lower end extends out of the ring 11. This design makes the lower sleeve fit tightly with the ring, further improving the dustproof effect; here, each protrusion 31 is respectively located in the notch 1 21 that matches it. When the utility model is used, the lower sleeve 3 is rotated to drive the notch 1 21 to be staggered with the notch 2 111, and the protrusion 31 is placed on the ring 11, so that the lower sleeve 3 will not be separated from the upper sleeve 1.

[0034] In this embodiment, the size of the first notch 21 is the same as the size of the second notch 111 .

[0035] In this embodiment, the outer diameter of the sealing ring 2 and the inner hole of the upper sleeve 1, as well as the inner diameter of the sealing ring 2 and the outer diameter of the lower sleeve 3 are transition fits.

[0036] In this embodiment, the protrusion 31 is loosely matched with the notch 1 21 or the notch 2 111 , and the lower sleeve 3 is rotated to align the notch 1 21 with the notch 2 111 longitudinally until the lower sleeve 3 is separated from the upper sleeve 1 , thereby completing the disassembly of the lower sleeve 3 and the upper sleeve 1 .

[0037] The installation and disassembly process of the utility model filler dustproof structure is as follows:

[0038] The installation process is as follows: put the sealing ring 2 and the lower sleeve 3 in turn from the top of the upper sleeve 1, rotate the lower sleeve 3 so that its protrusion 31 matches with the notch 1 21 in the sealing ring, continue to rotate the lower sleeve 3 to drive the sealing ring 2 to rotate so that the protrusion 31 and the notch 2 111 are staggered, at this time, the sealing ring 2 can cover the notch 2 111 of the upper sleeve;

[0039] The disassembly process is as follows: rotate the lower sleeve 3 so that the protrusion 31 is aligned with the second notch 111 and can pass through the second notch 111 to separate the lower sleeve 3 from the upper sleeve 1, and the sealing ring 2 remains in the upper sleeve 1.

[0040] Figure 8 As a specific application of the utility model, the packing dustproof structure of the utility model is sleeved on the outside of the valve stem 4 and located above the packing gland 6, the top of the upper sleeve 1 is welded to the valve electric connection plate 5, and the bottom of the lower sleeve 3 is welded to the packing gland 6;

[0041] like Figure 8 As shown, the sum of the lengths of the upper sleeve 1 and the lower sleeve 3 is slightly larger than the distance between the valve electric connection plate 5 and the stuffing gland 6, which can reserve space for the stuffing gland 6 to press the stuffing downward. When the stuffing is slightly worn, there is no need to disassemble the stuffing dust-proof structure of the utility model. By tightening the nut on the stuffing gland 6, the stuffing gland 6 is adjusted to press the stuffing downward, so that the sealing effect is achieved between the stuffing gland 6, the stuffing, the valve stem and the valve body.

[0042] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A packing dust-proof structure, characterized in that: The invention comprises an upper sleeve (1) and a lower sleeve (3), wherein the lower end of the upper sleeve (1) is provided with a circular ring (11) protruding inwardly, the upper end of the lower sleeve (3) is located inside the upper sleeve (1) and the outer side of the upper end thereof is provided with at least two protrusions (31) for preventing the lower sleeve (3) from detaching from the upper sleeve, the outer diameter of the lower sleeve (3) is loosely matched with the inner hole of the circular ring (11) and the lower end thereof protrudes out of the circular ring (11), the inner side of the circular ring (11) is provided with a second notch (111) for the protrusion (31) to pass through, and the protrusion (31) is staggered with the second notch (111) and is arranged on the circular ring (11).

2. A packing dust-proof structure according to claim 1, characterized in that: It also includes a sealing ring (2), which is arranged in the upper sleeve (1) and has its bottom surface abutting against the circular ring (11). The inner ring of the sealing ring (2) is provided with a notch (21) that runs through its upper and lower surfaces. Each of the protrusions (31) is respectively located in the notch (21) that matches it. The lower sleeve (3) is rotated to drive the notch (21) and the notch (111) to be offset.

3. A packing dust-proof structure according to claim 2, characterized in that: The size of the first notch (21) is the same as that of the second notch (111).

4. A packing dust-proof structure according to claim 2, characterized in that: The outer diameter of the sealing ring (2) and the inner hole of the upper sleeve (1), as well as the inner diameter of the sealing ring (2) and the outer diameter of the lower sleeve (3) are both transition fits.

5. A packing dust-proof structure according to claim 2, characterized in that: The protrusion (31) is loosely matched with the first notch (21) or the second notch (111).

6. A packing dust-proof structure according to claim 1, characterized in that: The packing dustproof structure is sleeved on the outside of the valve stem (4) and is located above the packing gland (6); the top of the upper sleeve (1) is welded to the valve electric connection plate (5); and the bottom of the lower sleeve (3) is welded to the packing gland (6).

7. A packing dust-proof structure according to claim 1, characterized in that: The number of the protrusions (31) is two, the two protrusions (31) are symmetrically arranged relative to the center of the upper sleeve (1), and the straight-line distance between the outer ends of the two protrusions (31) is greater than the inner diameter of the ring (11).

8. A packing dust-proof structure according to claim 1, characterized in that: The number of the protrusions (31) is more than two and they are distributed in a circular pattern on the outer side of the upper end of the lower sleeve (3).

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