Butterfly valve with middle line lined with rubber and self-cleaning function

Abstract

The utility model discloses a center line rubber lined butterfly valve with a self-cleaning function, which comprises a valve body, a round hole is arranged on the valve body, a valve seat is fixed at the round hole, an inner hole is arranged on the valve seat, a sealing rubber layer is fixed at the inner hole, V-shaped guide parts are arranged on the inner side and the outer side of the sealing rubber layer, and a straight sealing contact part is arranged in the middle of the sealing rubber layer. A valve rod is installed at the position of the valve body, a butterfly plate located at the position of an inner hole is fixed to the valve rod, a pair of symmetrically-arranged front plates is fixed to the butterfly plate, the diameter of the outer contour formed by the two front plates is consistent with the diameter of the outer contour of the butterfly plate, the section of the outer contour of the butterfly plate and the section of the outer contour of the two front plates are each in an arc shape, and the butterfly plate is tightly matched with the position of the sealing contact part. A worm and gear speed reducer is installed on the valve body, and a hand-cranking wheel is fixed to an input shaft of the worm and gear speed reducer. The sealing device is ingenious and reasonable in structural design, capable of sealing the surface of the rubber layer for automatic cleaning, better in sealing effect and worthy of application and popularization.

Description

Technical Field

[0001] The utility model relates to a valve, in particular to a butterfly valve, particularly a center line rubber lined butterfly valve with a self-cleaning function. Background Art

[0002] A butterfly valve is a valve that opens and closes by rotating the upper valve stem and driving the disc plate to rotate. Traditional butterfly valve seats will have impurities deposited on them over time, affecting the sealing performance and service life of the valve, making it impossible to achieve a good sealing function. In addition, when sealing with a traditional disc plate, the disc plate has a large force-bearing area, and long-term use will cause the disc plate to deform, further deteriorating the sealing performance and failing to achieve a long-term sealing effect.

[0003] Chinese utility model patent CN 208670081 U discloses an American standard turbine transmission butterfly valve, which includes a valve body, a valve stem is movably installed at the inner center of the valve body, a butterfly plate is fixedly installed on the outer surface of the valve stem, an O-ring is provided on the inner side of the valve body near the bottom end of the valve stem, an end cover is provided on the inner side of the valve body near the bottom end of the valve stem, a No. 2 sealing ring is provided on the inner side of the valve body near the bottom end of the butterfly plate, a valve upper cover is provided on the inner side of the valve body near the top end of the butterfly plate, a packing cover is provided on the inner side of the valve body near the top end of the valve stem, a turbine box is fixedly installed on the outer surface of the top end of the valve stem, a bracket is fixedly installed on the inner side of the valve body near the top end of the valve stem, a driving hand wheel is movably installed on the outer surface of one side of the turbine box, a handle is fixedly installed on the outer surface of one side of the driving hand wheel, a valve seat is fixedly installed on the outer surface of the bottom end of the valve body, a turbine is movably installed at the inner center of the turbine box, a worm is movably installed on the outer surface of the turbine, a radial bearing is provided on the outer side of the valve stem near the packing cover, and a thrust bearing is provided on the outer surface of the valve stem near the valve seat. When the butterfly valve is in a medium with a lot of impurities, impurities will be deposited on the sealing ring, which will cause the disc plate to not seal tightly, resulting in leakage of the medium, and the purpose of long-term sealing and low-cost maintenance cannot be achieved. Utility Model Content

[0004] The utility model aims to solve the above-mentioned shortcomings of the prior art and provide a center line rubber lined butterfly valve with a self-cleaning function, which meets the demand for good sealing performance during long-term use.

[0005] The utility model adopts a technical solution to solve the technical problem: the center line rubber lined butterfly valve with self-cleaning function comprises a valve body, a circular hole is formed on the valve body, a valve seat is fixed at the circular hole, an inner hole is formed on the valve seat, a sealing rubber layer is fixed at the inner hole, the inner and outer sides of the sealing rubber layer are V-shaped guide parts, the middle part of the sealing rubber layer is a straight sealing contact part, a valve stem is installed at the valve body, a disc plate located at the inner hole is fixed on the valve stem, a pair of symmetrically arranged front plates are fixed on the disc plate, the outer contour diameter formed by the two front plates is consistent with the outer contour diameter of the disc plate, the outer contour cross-sections of the disc plate and the two front plates are both arc-shaped, and the disc plate is tightly fitted at the sealing contact part; a worm gear reducer is installed on the valve body, and a hand wheel is fixed on the input shaft of the worm gear reducer. The role of the sealing rubber layer here is to seal the inner hole; the inner and outer sides of the sealing rubber layer are V-shaped guide parts, and the middle part of the sealing rubber layer is a straight sealing contact part, which is convenient for guiding the rotation of the disc plate and the front plate, and enables the outer contours of the disc plate and the front plate to cooperate with the sealing contact part to play a sealing role; the front plate can scrape the sealing rubber layer clean, and then the disc plate squeezes and seals the sealing rubber layer, so as to achieve a better and long-term sealing effect; the role of the worm gear reducer and the hand wheel here is to be able to The valve stem can be rotated easily, so that the disc plate and the front plate can be easily driven, and the worm gear reducer has a one-way self-locking property, so that only the hand-cranked wheel controls the rotation of the valve stem, and the disc plate and the front plate will not be impacted and rotated by the medium, which can cause leakage; when the butterfly plate acts on the straight sealing contact part in the middle of the sealing rubber layer, the medium pressure will bend through the front plate, thereby dispersing the impact pressure of the medium pressure directly on the disc plate, thereby alleviating the pressure on the disc plate, so that the disc plate can withstand higher medium pressure without deformation.

[0006] Further improvement, the valve body is provided with a socket for plugging the valve stem, a sealing plug fixed to the valve body is provided below the socket, a circular groove is provided on the top surface of the sealing plug, a thrust ball bearing is installed in the circular groove, and the valve stem is placed on the upper circle of the thrust ball bearing. The role of the socket, the sealing plug, the circular groove, and the thrust ball bearing here is to provide longitudinal support for the disc plate, so that when the disc plate rotates, too much longitudinal force will not act on the lower half of the sealing rubber layer, thereby reducing the wear of the lower half of the sealing rubber layer, increasing the service life of the sealing rubber layer, and through the support of the thrust ball bearing, the disc plate rotation operation will be easier and convenient to operate.

[0007] Further improvement, a self-lubricating bushing sleeved on the valve stem is fixed at the socket. The function of the self-lubricating bushing here is to reduce the friction when the valve stem rotates, making the disc plate rotate more easily; the self-lubricating bushing here is made of tin bronze material.

[0008] The beneficial effects of the utility model are:

[0009] 1). The surface of the sealing rubber layer can be cleaned before sealing;

[0010] 2). It can reduce the impact force of the medium on the disc plate and reduce the load on the valve stem;

[0011] 3). It can support the disc plate in the longitudinal direction, so that the disc plate can rotate more easily and with less friction resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a three-dimensional diagram of the utility model;

[0013] Figure 2 It is the front view of the utility model;

[0014] Figure 3 for Figure 2 AA section view;

[0015] Figure 4 for Figure 2 BB cross-section diagram;

[0016] Figure 5 The utility model is a flow chart of the working principle.

[0017] Explanation of the reference numerals: valve body 1, circular hole 1-1, valve seat 2, inner hole 2-1, sealing rubber layer 2-1a, guide portion 2a-1a, valve stem 3, disc plate 4, front plate 4-1, arc shape 5, reducer 6, hand wheel 7, sealing plug 8, circular groove 8-1, thrust ball bearing 9, self-lubricating bushing 10. DETAILED DESCRIPTION

[0018] The utility model is further described below in conjunction with the accompanying drawings:

[0019] Referring to the accompanying drawings: This centerline rubber-lined butterfly valve with self-cleaning function includes a valve body 1, a circular hole 1-1 is opened on the valve body 1, a valve seat 2 is fixed at the circular hole 1-1, an inner hole 2-1 is opened on the valve seat 2, a sealing rubber layer 2-1a is fixed at the inner hole 2-1, the inner and outer sides of the sealing rubber layer 2-1a are V-shaped guide parts 2a-1a, the middle part of the sealing rubber layer 2-1a is a straight sealing contact part 2b-1a, and a valve stem 3 is installed at the valve body 1. A disc plate 4 located at the inner hole 2-1 is fixed on the valve stem 3, and a pair of symmetrically arranged front plates 4-1 are fixed on the disc plate 4. The outer contour diameter formed by the two front plates 4-1 is consistent with the outer contour diameter of the disc plate 4. The outer contour cross-sections of the disc plate 4 and the two front plates 4-1 are both in an arc shape 5, and the disc plate 4 is tightly fitted at the sealing contact portion 2b-1a; a worm gear reducer 6 is installed on the valve body 1, and a hand wheel 7 is fixed on the input shaft of the worm gear reducer 6.

[0020] The valve body 1 is provided with a plug hole 1-2 for inserting the valve stem 3, and a sealing plug 8 fixed to the valve body 1 is provided below the plug hole 1-2. A circular groove 8-1 is provided on the top surface of the sealing plug 8, and a thrust ball bearing 9 is installed in the circular groove 8-1. The valve stem 3 is placed on the upper circle of the thrust ball bearing 9.

[0021] A self-lubricating bushing 10 sleeved on the valve stem 3 is fixed at the insertion hole 1-2.

[0022] Working principle of the utility model: In the working condition where the medium contains impurities, impurities will be deposited on the valve seat of the ordinary butterfly valve for a long time, affecting the sealing performance and service life of the valve; the utility model adopts a rotating hand crank wheel 7, thereby driving the valve stem 3 to rotate through the worm gear reducer 6, thereby driving the two front plates 4-1 to rotate first, and scrape the surface of the sealing contact part 2b-1a clean, and continue to rotate the valve stem 3, so that the disc plate 4 is tightly fitted at the sealing contact part 2b-1a of the sealing rubber layer 2-1a again (such as Figure 5 As shown), the butterfly valve is sealed; in this way, when the valve is closed, the front plate 4-1 first passes through the sealing contact portion 2b-1a, and the deposits at the sealing contact portion 2b-1a are promptly removed, so as to ensure that the seal of the butterfly plate 4 is not damaged, the service life of the butterfly valve is guaranteed, and the maintenance cost is reduced, which is worthy of promotion and application; here, the rotation center of the disc plate 4 is consistent with the rotation center of the inner hole 2-1, and the disc plate 4 is in a non-eccentric state.

[0023] Although the present invention has been shown and described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein within the scope of the claims.

Claims

1. A centerline rubber-lined butterfly valve with a self-cleaning function, comprising a valve body (1), characterized in that: The valve body (1) is provided with a circular hole (1-1), a valve seat (2) is fixed at the circular hole (1-1), an inner hole (2-1) is provided on the valve seat (2), a sealing rubber layer (2-1a) is fixed at the inner hole (2-1), the inner and outer sides of the sealing rubber layer (2-1a) are V-shaped guide portions (2a-1a), the middle portion of the sealing rubber layer (2-1a) is a straight sealing contact portion (2b-1a), and the valve body (1) is provided with a sealing member (2b-1a). A valve stem (3) is provided, a disc plate (4) located at the inner hole (2-1) is fixed on the valve stem (3), a pair of symmetrically arranged front plates (4-1) are fixed on the disc plate (4), the outer contour diameter formed by the two front plates (4-1) is consistent with the outer contour diameter of the disc plate (4), the outer contour cross-sections of the disc plate (4) and the two front plates (4-1) are both in an arc shape (5), and the disc plate (4) is tightly fitted at the sealing contact portion (2b-1a); A worm gear reducer (6) is mounted on the valve body (1), and a hand-cranked wheel (7) is fixed on the input shaft of the worm gear reducer (6).

2. According to claim 1, a center line rubber lined butterfly valve with self-cleaning function is characterized by: The valve body (1) is provided with a plug hole (1-2) for inserting the valve stem (3); a sealing plug (8) fixed to the valve body (1) is provided below the plug hole (1-2); a circular groove (8-1) is provided on the top surface of the sealing plug (8); a thrust ball bearing (9) is installed in the circular groove (8-1); and the valve stem (3) is placed on the upper ring of the thrust ball bearing (9).

3. According to claim 2, a center line rubber lined butterfly valve with self-cleaning function is characterized by: A self-lubricating bushing (10) matched with the valve stem (3) is fixed at the insertion hole (1-2).

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