Sealing sleeve structure for valve shaft

Abstract

The utility model discloses a sealing sleeve structure for valve shaft, include: sealing sleeve (3), the sealing sleeve is cooperated with valve shaft, the upper portion outer periphery of sealing sleeve is equipped with C type notch, split type gland (2), split type gland includes two folding into annular and C type notch cooperation's arc -shaped gland, the arc -shaped gland is evenly distributed with countersunk hole and threaded through -hole, the utility model has the advantages of sealing sleeve convenient installation and taking out.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve parts device especially relates to the sealing sleeve structure for valve shaft. BACKGROUND

[0002] At present, the rotary switch valve used in large water conveyance engineering, town water supply and drainage, petroleum and petrochemical industry, such as butterfly valve, ball valve, rotary check valve, such as butterfly check valve, needs to input torque inwards or transmit torque outwards through valve shaft, and the structure of shaft seal is very important.

[0003] At present, the common shaft seal forms have two kinds, one is packing seal, and the other is O-ring seal. The packing seal structure has many components and occupies large space, and when the driving component (such as worm gear box) is arranged, a support needs to be installed to make the packing gland have adjusting space, and the valve shaft must be lengthened to make up the height of the support, which causes great waste and is inconvenient to disassemble and assemble. The O-ring seal structure is that the O-ring is embedded in the sealing groove on the copper sleeve, and then the copper sleeve is inserted into the shaft hole. The shaft seal structure of this way does not need support, but the sunken design causes the copper sleeve to be difficult to take out during maintenance, and if the copper sleeve and the gland are designed as an integrated type, copper material will be wasted.

[0004] For example, the utility model patent publication number CN2178818Y discloses a new stop valve, which comprises a valve body, a valve cover, a valve core, sealing packing and a hand wheel, characterized in that a valve rod sleeve is arranged on the outer side of the valve core rod, the top of the valve rod sleeve extends out of the valve cover and is tightly connected with the hand wheel through a nut, the inner wall of the sleeve has threads which are matched with the external threads of the valve core rod, and the lower part of the valve core has a guide groove which is matched with the strip ribs on the inner wall of the valve body. The patent technology adopts packing seal. UTILITY MODEL CONTENT

[0005] The utility model solves the technical problems of the existing valve shaft sealing mode, and provides a sealing sleeve structure for valve shaft.

[0006] The technical scheme of the utility model is as follows: a sealing sleeve structure for valve shaft, comprising: a sealing sleeve, the sealing sleeve is matched with a valve shaft, a C-shaped notch is formed in the upper outer circumferential surface of the sealing sleeve; a split gland, the split gland comprises two arc-shaped glands which are combined into a ring shape and matched with the C-shaped notch, and the arc-shaped glands are uniformly provided with countersunk holes and threaded through holes.

[0007] In the above scheme, the inner circumferential surface of the arc-shaped gland is in L-shaped cross section.

[0008] In the above scheme, the countersunk holes and the threaded through holes are symmetrically distributed on the two arc-shaped glands.

[0009] In the above scheme, the other lug is circular or rectangular.

[0010] The sealing sleeve in the scheme is made of copper alloy.

[0011] The arc-shaped gland in the scheme is made of carbon steel or stainless steel.

[0012] The improvement of the scheme is that the dismounting tool further comprises two arc-shaped blocks, two threaded holes are formed in the arc-shaped blocks, and the two threaded holes are connected with the two threaded through holes of the two arc-shaped glands through screws, so that the two arc-shaped glands are integrated.

[0013] The sealing sleeve is convenient to install and take out. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a schematic view of the utility model;

[0015] Figure 2 is Figure 1 a sectional view;

[0016] Figure 3 is Figure 1 a schematic view of cooperation between the sealing sleeve and the split gland;

[0017] Figure 4 is a schematic view of the utility model in the installation state;

[0018] In the drawing, 1 is a valve shaft, 2 is a split gland, 3 is a sealing sleeve, 4 is an outer O-shaped ring, 5 is an inner O-shaped ring, 6 is a valve body, and 7 is an arc-shaped block. DETAILED DESCRIPTION

[0019] The utility model will be further described below in combination with the drawings.

[0020] The valve shaft sealing sleeve structure comprises: a sealing sleeve 3, which cooperates with a valve shaft, and a C-shaped notch is formed in the upper outer circumferential surface of the sealing sleeve; a split gland 2, which comprises two arc-shaped glands that are folded into a ring and cooperate with the C-shaped notch, and the arc-shaped glands are uniformly provided with countersunk holes and threaded through holes.

[0021] A step is arranged on the valve shaft and can cooperate with the bottom of the sealing sleeve to limit. A C-shaped notch is arranged on the outer cylindrical surface of the sealing sleeve and cooperates with the split gland to limit. The arc-shaped gland is a ring-shaped piece with an L-shaped single-sided section formed by wire cutting, and the arc-shaped gland is uniformly provided with countersunk holes and threaded through holes. An outer O-shaped ring 4 that contacts the valve body is arranged on the lower outer circumferential surface of the sealing sleeve, and an inner O-shaped ring 5 that contacts the valve shaft is arranged on the inner circumferential surface of the sealing sleeve.

[0022] The dismounting tool comprises two arc-shaped blocks 7, two threaded holes are formed in the arc-shaped blocks, and the two threaded holes are connected with two threaded through holes in the two arc-shaped glands through screws respectively, so that the two arc-shaped glands are integrated.

[0023] Installation: firstly, the valve shaft 1 is installed in the shaft hole of the valve body 6, then the sealing sleeve is installed in the half position of the valve shaft, and then the split gland is clamped into the C-shaped notch of the sealing sleeve, at this time, the sealing sleeve and the split gland are pushed into the shaft hole of the valve body at the same time and are fixed on the valve body by screws. The C-shaped annular notch cooperates with the split gland, so that the sealing sleeve can be kept in the designed position and cannot move upward or downward. The bottom of the sealing sleeve is in contact with the step of the valve shaft for limiting, so that the valve shaft can be prevented from blowing out.

[0024] Dismounting: when the sealing ring reaches the service life and needs to be overhauled and replaced, the dismounting tool can be bolted with the four threaded through holes of the split gland two by two, the two arc-shaped glands can be integrated, at this time, the sealing sleeve can be pushed out of the shaft hole of the valve body by screws from the other two threaded through holes of the split gland.

[0025] The sealing sleeve is made of copper alloy material, and the split gland can be made of more economical materials such as carbon steel or stainless steel.

[0026] Those skilled in the art should know that the protection scheme of the utility model is not limited to the above-mentioned embodiments, and various permutations, combinations and transformations can be made on the basis of the above-mentioned embodiments. Various transformations of the utility model without departing from the spirit of the utility model fall within the protection scope of the utility model.

Claims

1. A valve shaft sealing sleeve structure, characterized in that it includes: A sealing sleeve (3) is matched with a valve shaft, and a C-shaped notch is formed on an upper outer circumferential surface of the sealing sleeve; a split type gland (2) includes two arc-shaped glands which are combined into a ring shape and matched with the C-shaped notch, and the arc-shaped glands are uniformly provided with countersunk holes and threaded through holes.

2. The seal sleeve structure for a valve shaft according to claim 1, wherein: An inner circumferential surface of the arc-shaped gland is in an L-shaped cross section.

3. The seal sleeve structure for a valve shaft according to claim 1, wherein: The countersunk holes and the threaded through holes are symmetrically distributed on the two arc-shaped glands.

4. The seal sleeve structure for a valve shaft according to claim 1, wherein: The sealing sleeve is made of copper alloy.

5. The seal sleeve structure for a valve shaft according to claim 1, wherein: The arc-shaped glands are made of carbon steel or stainless steel.

6. The seal sleeve structure for a valve shaft according to claim 1, wherein: Further comprising A dismounting tool includes two arc-shaped blocks (7) which are provided with two threaded holes, and the two threaded holes are connected with the two threaded through holes on the two arc-shaped glands through screws, so that the two arc-shaped glands are combined into one.

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