TWM543311U - Self-tightening sealing elastic butterfly valve seat - Google Patents

Description

Self-tightening butterfly valve elastic seat

The present invention relates to a fluid switch, and more particularly, to a soft backrest (rubber) butterfly valve (hereinafter referred to as a butterfly valve) having a high sealing property and a low torque characteristic.

The butterfly valve is applied to the opening and closing of the fluid pipeline and the flow control. The structure of the butterfly valve generally comprises a valve body, an elastic valve seat sleeved in the valve body, and a butterfly plate pivotally disposed on the valve body and having an open and closed relationship with the elastic valve seat. The disc can perform a reciprocating rotation of 0-90 degrees in the elastic valve seat, and rotate to a disc of 0 degree, the diameter of which is orthogonal to the axis of the elastic valve seat, the butterfly plate completely closes the elastic valve seat; rotates to 90 The diameter of the butterfly plate is parallel to the axis of the elastic valve seat, so that the elastic valve seat has the maximum opening area and the maximum flow rate; and when the disk is rotated to more than 0 degrees and less than 90 degrees, the elastic valve seat can be controlled. The size of the traffic.

The Republic of China new patent M517277 proposes an improved butterfly valve structure, which is closed by the convex portion between the elastic valve seat and the valve body and the pressure groove between the elastic valve seat and the outer diameter end surface of the butterfly plate. When the valve seat is elastic, due to the pressure of the fluid on the butterfly plate, the outer end surface of the butterfly plate is pressed against the elastic valve seat, so that the interference between the elastic valve seat and the butterfly plate is increased, and the compression of the elastic valve seat is increased. The amount of self-tightening is achieved.

The elastic seat seat interference (rubber compression) and the butterfly torque are two important points that the butterfly valve design is difficult to balance. The large sealing pressure requires a large interference, but the large interference increases the butterfly. Torque, resulting in increased disc rotation resistance.

In order to solve the contradiction and conflict between the butterfly valve's interference and the butterfly torque, this creation proposes a solution.

The invention relates to a self-tightening butterfly valve elastic valve seat, the elastic valve seat is sleeved between a valve body of a butterfly valve and a rotatable butterfly plate of the butterfly valve, and the rotation of the butterfly plate can open and close the inner cavity of the elastic valve seat; The utility model is characterized in that: a double wedge structure is arranged between the outer annular surface of the elastic valve seat and the inner annular surface of the valve body, and the double wedge structure comprises a triangular cross section and protrudes from the outer annular surface of the elastic valve seat. Two wedge-shaped convex rings, a wedge-shaped annular groove disposed on the inner annular surface of the valve body and corresponding to the two-wedge convex ring, and an intermediate annular groove disposed between the outer annular surface of the elastic valve seat and the two wedge-shaped convex ring And an intermediate ring surface disposed on the inner annular surface of the valve body and corresponding to the intermediate groove.

Further, the bottom of the intermediate ring is trapped in the outer annular surface of the elastic valve seat.

Further, the elastic valve seat is an inner inner ring surface with respect to the inner annular surface of the intermediate ring groove, and the inner annular surface connected to the intermediate inner ring surface to the elastic valve seat end portion is a side inner inner ring surface, the side The end inner annulus is a tapered surface that tapers toward the end of the resilient valve seat.

Further, the elastic valve seat is an intermediate inner ring surface with respect to the inner annular surface of the intermediate ring groove, and the intermediate inner ring surface is the most convex portion of the entire inner annular surface of the elastic valve seat.

The specific effect of the creation: the double wedge structure specifically increases the high-pressure sealing performance of the elastic valve seat, and specifically reduces the turning torque of the butterfly valve opening. This creation is an elastic valve seat that is resistant to high pressure seals and can specifically control the deformation of the elastic valve seat and keep the torque of the butterfly plate stable (or reduce the torque of the butterfly plate).

The double wedge structure is a symmetrical structure of approximately W type, so that the elastic valve seat has The effect of two-way sealing.

10‧‧‧ valve body

11‧‧‧Upper stem group

12‧‧‧ Lower stem group

13‧‧‧ Inner torus

14‧‧‧Wedge ring groove

15‧‧‧Intermediate ring convex

27‧‧‧Wedge seal sub-area

30‧‧‧Butter

32‧‧‧OD end face

40‧‧‧Double wedge structure

51‧‧‧High pressure zone

52‧‧‧Low-pressure zone

20‧‧‧Flexible seat

21‧‧‧ lumen

22‧‧‧ outer annulus

23‧‧‧ wedge-shaped collar

24‧‧‧Intermediate ring ditch

25‧‧‧Intermediate torus

26‧‧‧Edge inner annulus

Arrow F‧‧‧ turning torque

Arrow G‧‧‧ creep direction

L1‧‧‧ indicates a little chain line at the bottom of the groove of the intermediate ring

L2‧‧‧ indicates a little chain line on the outer ring surface of the elastic seat

X1‧‧‧Axis of elastic seat

Ø‧‧‧Diameter diameter

The first picture shows the three-dimensional appearance of the butterfly valve.

The second figure is an exploded perspective view of the butterfly valve.

Figure 3 is a partial cross-sectional view of the inventive elastic valve seat.

Figure 4 is a cross-sectional view taken along line IV-IV in Figure 1.

Fig. 5 is a partial enlarged view of Fig. 4.

Figure 6 is a partial enlarged view of the rotary butterfly valve.

Figure 7 is a schematic cross-sectional view showing the opening of the elastic valve seat of the butterfly valve.

For the convenience of the description, the central idea expressed in the column of the above novel content is expressed by a specific embodiment. The various items in the embodiments are depicted in terms of ratios, dimensions, and displacements as appropriate, and are not drawn to scale the actual elements, as described in the foregoing.

As shown in Figures 1 and 2, the present butterfly valve includes a valve body 10, an elastic valve seat 20 that is sleeved in the valve body 10, and a pivotable pivot through an upper valve stem group 11 and a lower valve stem group 12. A butterfly plate 30 is provided on the valve body 10 and has an open-close relationship with the elastic valve seat 20. A hand tool (not shown) operates the upper valve stem group 11 to control the rotation of the butterfly plate 30 to open and close the inner cavity 21 of the elastic valve seat 20.

As shown in Figures 2 and 3, a double wedge structure 40 is provided between the outer annular surface 22 of the resilient valve seat 20 and the inner annular surface 13 of the valve body 10, and the double wedge structure 40 includes a triangular and convex section. Two wedge-shaped convex rings 23 for the outer annular surface 22 of the elastic valve seat 20, a wedge-shaped annular groove 14 provided on the inner annular surface 13 of the valve body 10 and embedded with the two wedge-shaped convex rings 23, and the elastic valve Seat 20 outer ring surface 22 is between the two wedges An intermediate ring groove 24 between the convex rings 23 and an intermediate ring 15 provided in the inner annular surface 13 of the valve body 10 and embedded in the intermediate ring groove 24.

In Fig. 3, the bottom of the groove representing the intermediate ring groove 24 is pulled by the one-point chain line L1, and the outer ring surface 22 of the elastic valve seat 20 is pulled by the one-point chain line L2. By the difference in position between L1 and L2, It is revealed that the bottom of the groove of the intermediate ring groove 24 is depressed by the outer annular surface 22 of the elastic valve seat 20. Moreover, the inner annular surface of the elastic valve seat 20 relative to the intermediate ring groove 24 is defined as an intermediate inner ring surface 25, and the inner annular surface connected to the intermediate inner annular surface 25 to the end of the elastic valve seat 20 is defined as a side end. The inner ring surface 26 is a tapered surface that tapers toward the end of the elastic valve seat 20, specifically such that the intermediate inner ring surface 25 is the most central portion of the inner annular surface of the elastic valve seat 20. The protruding part. Further, the portion of the resilient valve seat 20 that corresponds to the double wedge structure 40 is defined as a wedge seal sub-region 27 (such as the portion of the circle surrounded by the dashed triangle).

As shown in FIGS. 4 and 7, the hand tool (not shown) operates the upper valve stem group 11 of FIG. 2 to control the disc 30 to perform a reciprocating rotation of 0-90 degrees in the elastic valve seat 20, and rotate to The 0 degree disc 30 has a diameter Ø orthogonal to the axis X1 of the elastic valve seat 20, the disc 30 completely enclosing the inner cavity 21 of the elastic valve seat 20; and rotated to a 90 degree disc 30, The diameter Ø is parallel to the axis X1 of the resilient valve seat 20 such that the inner chamber 21 of the elastomeric valve seat 20 has a maximum opening area and provides maximum fluid flow. It can be seen from the logic deduction that the disc 30 rotated to more than 0 degrees and less than 90 degrees can control the opening area and the flow rate of the inner cavity 21 of the elastic valve seat 20.

4 and 5 illustrate that the disc 30 is rotated from the above 90 degrees to 0 degrees to completely close the inner cavity 21 of the elastic valve seat 20, and the disc 30 is in close contact with the elastic valve seat 20 by the outer end surface 32. Intermediary inner annulus 25. The butterfly valve is closed, and the valve body 10 is separated into two spaces by the butterfly plate 30, wherein one space is a high pressure zone 51 having fluid pressure, and the other space is a low pressure without fluid pressure. Zone 52, the two spaces exhibit different pressures, creating a pressure differential, which we define as the seal pressure differential. The elastic valve seat 20 is subjected to the sealing pressure difference, and the rubber of the wedge seal sub-region 27 creeps toward the low pressure region 52, and the creep direction is as indicated by an arrow G. The peristaltic deformation of the wedge seal sub-region 27 increases the seal interference of the resilient valve seat 20. Moreover, the larger the sealing pressure difference is, the larger the creep deformation is, and the larger the sealing interference is; that is, the sealing pressure difference increases the creep deformation amount of the wedge sealing sub-region 27, and the sealing ability of the elastic valve seat 20 is enhanced. Further, the double wedge structure 40 is a symmetrical structure of approximately W type, and thus the elastic valve seat 20 has a bidirectional sealing effect.

6, 7 depicts the disc 30 being rotated from the above 0 degrees to 90 degrees to completely open the inner cavity 21 of the resilient valve seat 20. The slewing torque (arrow F) of the disc 30 from the double wedge seal region 27 is specifically reduced (or has no significant change) for the following reasons: because the creep of the elastic valve seat 20 causes the direction of rotation of the disc 30 The tangential forces cancel each other out, and the increase in friction caused by the increase in pressure due to creep is very small, and the elastic valve seat 20 that creeps when the upper disc 30 is opened pushes the disc 30 to the elasticity. The outer end inner ring surface 26 of the valve seat 20 is a labor-saving (dissipating) movement, so that opening the butterfly plate 30 is labor-saving.

10‧‧‧ valve body

11‧‧‧Upper stem group

12‧‧‧ Lower stem group

20‧‧‧Flexible seat

21‧‧‧ lumen

22‧‧‧ outer annulus

23‧‧‧ wedge-shaped collar

24‧‧‧Intermediate ring ditch

25‧‧‧Intermediate torus

26‧‧‧Edge inner annulus

30‧‧‧Butter

32‧‧‧OD end face

40‧‧‧Double wedge structure

Claims (4)

Self-tightening butterfly valve elastic valve seat, the elastic valve seat is sleeved between a valve body of a butterfly valve and a rotatable butterfly plate of the butterfly valve, and the rotation of the butterfly plate can open and close the inner cavity of the elastic valve seat; The utility model is characterized in that: a double wedge structure is arranged between the outer annular surface of the elastic valve seat and the inner annular surface of the valve body, and the double wedge structure comprises two triangles having a triangular cross section and protruding from the outer annular surface of the elastic valve seat. a wedge-shaped convex ring, a wedge-shaped annular groove provided on the inner annular surface of the valve body and embedded by the two wedge-shaped convex ring, and an intermediate ring groove disposed between the outer annular surface of the elastic valve seat and the two wedge-shaped convex ring, And an intermediate ring protrusion disposed on the inner annular surface of the valve body and embedded in the intermediate ring groove. The self-tightening butterfly valve elastic valve seat according to claim 1, wherein the groove bottom of the intermediate ring groove is trapped in an outer annular surface of the elastic valve seat. The self-tightening butterfly valve elastic valve seat according to claim 1, wherein the elastic valve seat is an intermediate inner ring surface with respect to the inner annular surface of the intermediate ring groove, and is connected to the intermediate inner ring surface to the end of the elastic valve seat. The inner ring surface is a side end inner ring surface, and the inner end inner ring surface is a tapered surface that gradually expands toward the end of the elastic valve seat. The self-tightening butterfly valve elastic valve seat according to claim 1, wherein the elastic valve seat is an inner inner ring surface with respect to the inner annular surface of the intermediate ring groove, and the intermediate inner ring surface is the innermost inner ring surface of the elastic valve seat. The part that protrudes toward the center.