CN209444840U - A kind of strong rubber adhesive force eccentric stopcock valve plug - Google Patents

Abstract

A kind of strong rubber adhesive force eccentric stopcock valve plug, it includes the flap ontology for the bow-shaped structural being prepared using metal material, positioned at the valve shaft of flap ontology upper and lower side, it is characterized by: offering criss-cross T-slot on the flap ontology, rubber wrapping layer is coated on the flap ontology for offering criss-cross T-slot, and the rubber wrapping layer extends in T-slot；A kind of accurate calculation method is provided for the design of rubber wrapping layer, conveniently can accurately determine necessary rubber-coated thickness, it is ensured that the reliability of sealing.

Description

An Eccentric Plug Valve Plug with Strong Rubber Adhesion

technical field

The utility model relates to an eccentric cock valve plug, in particular to an eccentric cock valve plug with strong rubber adhesion and long service life.

Background technique

At present, the shape of the valve plug of the eccentric plug valve can be cylindrical or conical, and the valve disc is only coated with anti-rust material on the surface. This method has poor anti-rust and sealing ability and short service life. The existing design method is to directly cover the valve clack with rubber. For example, the patent CN103671996A only directly coats a layer of rubber on the valve clack. The rubber adhesion is small. When the valve plug is opened and closed, it will be washed by the medium. There is a large shear force, and the friction between the valve plug and the valve body causes serious rubber wear, resulting in a decrease in the sealing performance of the valve plug. In addition, there is no optimal quantitative calculation relationship between the sealing angle and the lagging thickness, and the necessary rubber thickness cannot be accurately determined, which affects the sealing performance.

Contents of the invention

The purpose of this utility model is to provide a strong rubber adhesion eccentric plug valve plug with high rubber adhesion and long service life in view of the shortcomings in the above-mentioned prior art.

The purpose of this utility model can be achieved through the following technical measures:

The valve plug of the eccentric plug valve with strong rubber adhesion of the utility model includes a disc body with a bow-shaped structure made of metal materials, and a valve shaft located at the upper and lower ends of the disc body; The groove is covered with a rubber wrapping layer on the valve clack body provided with criss-cross T-shaped grooves, and the rubber wrapping layer extends into the T-shaped grooves.

In the utility model, the T-shaped grooves are arranged at the effective sealing contact surface between the valve clack and the valve body, and the number of the T-shaped grooves is two for each of the upper, lower, left and right. Specifically, under the condition of ensuring metal strength and rigidity, according to the initial sealing angle, vertical and horizontal T-shaped grooves are added at the effective sealing contact surface between the valve disc body and the valve body, and the valve disc body is covered with a layer of rubber wrapping layer. The contact area between the large rubber wrapping layer and the valve clack body increases the friction force between the rubber wrapping layer and the valve clack body in the direction perpendicular to the surface of the valve clack, which greatly improves the rubber adhesion. In addition, the cylindrical seat surface of the valve plug is eccentrically offset and does not contact the seat until it is 90% closed, ensuring long plug life. At the same time, the disc body and the valve shaft are cast in one piece, with high strength and rigidity, and good torque transmission performance. The bow-shaped design not only reduces the weight of the disc, but also guides the fluid, prolonging the working life. Accurate calculation method of covering rubber can ensure sufficient rubber wear and compression.

The thickness of rubber wrapping layer (2) described in the utility model is calculated by formula (2):

(2)

Where: e is the eccentricity,

ω is the compression ratio,

In the formula: h _BO is the distance from the sealing point to the center of rotation, β is the rotation angle, β _A is the sealing end angle, β ₀ is the sealing start angle, R iron is the core radius, L is the thickness of the lagging, h _AB is the sealing Stroke, m is the coefficient related to the fluid, a, c are the coefficients related to the sealing surface, p is the nominal pressure of the fluid, E is the elastic modulus, b _m is the projected width of the sealing surface perpendicular to the direction of fluid flow .

The beneficial effects of the utility model are as follows:

1. The T-shaped groove can effectively increase the contact area between the rubber wrapping layer and the disc body, and increase the friction between the rubber and the disc in the direction perpendicular to the surface of the disc, which greatly improves the rubber adhesion.

2. When the valve plug is working, the T-groove can reduce the shearing force between rubber and metal and improve the service life of the valve plug. The disc and the valve shaft are cast in one piece, with high strength and rigidity, and good torque transmission performance. The bow-shaped design not only reduces the weight of the disc, but also guides the fluid, prolonging the working life.

3. The surface of the cylindrical valve seat of the valve plug is eccentrically offset, and does not contact the valve seat before 90% of the valve is closed, ensuring a long life of the valve plug.

4. Accurate rubber coating calculation method can ensure sufficient rubber wear and compression.

Description of drawings

Fig. 1 is the front view of the utility model.

Fig. 2 is a top view of the utility model.

Fig. 3 is a partial sectional view of a T-shaped slot.

Fig. 4 is a left view of the valve core of the present invention.

Fig. 5 is a schematic diagram of eccentricity design calculation.

Figure 6 is a design diagram of the angle and lagging thickness.

In the figure: 1. Disc body, 2. Rubber wrapping layer, 3. T-slot, 4. Valve shaft.

Detailed ways

The utility model will be further described below in conjunction with embodiment (accompanying drawing):

As shown in Figures 1, 2, 3, and 4, the eccentric plug valve plug with strong rubber adhesion of the present invention includes a disc body 1 with a bow-shaped structure made of metal materials, and a valve shaft located at the upper and lower ends of the disc body 1. 4. The disc body 1 is provided with criss-cross T-shaped grooves 3, and the disc body 1 provided with criss-cross T-shaped grooves 3 is covered with a rubber wrapping layer 2, and the rubber wrapping layer 2 Extend into the T-shaped slot 3.

Further speaking: in the utility model, the T-shaped groove 3 is arranged at the effective sealing contact surface between the valve disc body 1 and the valve body, and the number of the T-shaped groove 3 is two for each of the upper, lower, left and right. Specifically, under the condition of ensuring the strength and rigidity of the metal, according to the initial sealing angle, a vertical and horizontal T-shaped groove 3 is added at the effective sealing contact surface between the valve body 1 and the valve body, and the valve body 1 is covered with a layer of rubber wrapping layer 2, T-shaped The groove 3 can effectively increase the contact area between the rubber wrapping layer 2 and the valve flap body 1, and increase the friction force between the rubber wrapping layer 2 and the valve flap body 1 in the direction perpendicular to the surface of the valve flap body, greatly improving rubber adhesion. In addition, the cylindrical seat surface of the valve plug is eccentrically offset and does not contact the seat until it is 90% closed, ensuring long plug life. At the same time, the disc body 1 and the valve shaft 4 are casted in one piece, with high strength and rigidity, and good torque transmission performance. The bow-shaped design not only reduces the weight of the disc, but also guides the fluid, prolonging the working life. Accurate calculation method of covering rubber can ensure sufficient rubber wear and compression.

The thickness of rubber wrap described in the utility model is calculated by following formula:

(3)

Where: e is the eccentricity,

ω is the compression ratio,

In the formula: h _BO is the distance from the sealing point to the center of rotation, β is the rotation angle, β _A is the sealing end angle, β ₀ is the sealing start angle, R iron is the core radius, L is the thickness of the lagging, h _AB is the sealing Stroke, m is the coefficient related to the fluid, a, c are the coefficients related to the sealing surface, p is the nominal pressure of the fluid, E is the elastic modulus, b _m is the projected width of the sealing surface perpendicular to the direction of fluid flow .

The specific calculation steps of the design are as follows:

The first step is to select the initial sealing angle β ( ∠BOO ₁ ≤ β ≤90° -∠BOO ₁ ).

As shown in Figures 2 and 4, add vertical and horizontal T-shaped grooves 3 at the initial sealing angle of the iron core until the end of the effective sealing surface.

The second step is to determine the eccentricity according to Figure 5:

In the formula, the sealing working section of the cock is the arc length from point A to point B, h _AB is the sealing stroke, β _A is the sealing end angle, β ₀ is the sealing start angle, and e is the eccentricity.

The third step is to calculate the rubber compression ratio:

In the formula, m is a coefficient related to the fluid, a and c are coefficients related to the sealing surface, p is the nominal pressure of the fluid, b _m is the projection width of the sealing surface perpendicular to the direction of fluid flow, and ω is the compression of the rubber seal rate, and E is the modulus of elasticity.

The fourth step is to calculate the lagging thickness according to Figure 6:

In the formula, h _BO is the distance from the sealing point to the center of rotation, β is the rotation angle, e is the eccentricity, R _iron is the radius of the iron core, ω is the compressibility, and L is the thickness of the lagging.

Claims (3)

1. A strong rubber adhesion force eccentric plug valve plug, which includes a disc body (1) with a bow-shaped structure made of metal materials, and a valve shaft (4) positioned at the upper and lower ends of the disc body (1). In that: the disc body (1) is provided with criss-cross T-shaped grooves (3), and the valve disc body (1) provided with criss-cross T-shaped grooves (3) is covered with a rubber wrapping layer ( 2), and the rubber wrapping layer (2) extends into the T-shaped groove (3). 2. The eccentric plug valve plug with strong rubber adhesion according to claim 1, characterized in that: the T-groove (3) is set at the effective sealing contact surface between the disc body (1) and the valve body, and the The quantity of T-shaped groove (3) is each two of upper, lower, left and right. 3. The eccentric plug valve plug with strong rubber adhesion according to claim 1, characterized in that: the thickness of the rubber wrapping layer (2) is calculated by formula (1): (1) Where: e is the eccentricity, ω is the compression ratio, In the formula: h _BO is the distance from the sealing point to the center of rotation, β is the rotation angle, β _A is the sealing end angle, β ₀ is the sealing start angle, R _iron is the core radius, L is the thickness of the lagging, h _AB is the sealing Stroke, m is the coefficient related to the fluid, a, c are the coefficients related to the sealing surface, p is the nominal pressure of the fluid, E is the elastic modulus, b _m is the projected width of the sealing surface perpendicular to the direction of fluid flow .