CN210050311U - Sealing ring - Google Patents

Abstract

The utility model relates to a valve part provides a sealing washer, include: a ring-shaped body; and a boss (21) protruding from the inner side of the main body to the center of the main body, the boss being used for forming a surface seal with an external seal member. The sealing ring is particularly suitable for butterfly valves used under the condition of large drift diameter, and has the advantages of simple structure, high sealing reliability, low air flow pressure loss and low noise.

Description

Sealing ring

Technical Field

The utility model relates to a valve part, more specifically relates to a sealing washer.

Background

The large-drift-diameter electric switch valve under a low-pressure environment is required to be used in medical equipment, and the valve is required to have the characteristics of small volume, low cost, simple structure, high switch response speed, good sealing performance, low pressure loss, long service life and the like.

Chinese patent application CN201510232543.0 describes a shutter valve comprising: a swinging member, a valve body and a driving part. The swinging component is positioned in the valve body and can rotate around a shaft in the valve body to be close to or far away from the valve port, so that the quick opening and closing of the fast door valve and the air flow disturbance are realized; the bidirectional electromagnet of the driving part provides rotary power for the opening, closing and disturbance of the valve. The shutter valve described in the chinese patent application CN201510232543.0 has the disadvantage that the impact of the swing member on the valve port is large, which can generate large noise; is not suitable for hospital wards. And after long-term impact, the sealing performance of the valve port is reduced.

PCT patent application WO2012042255a1 describes a valve which can be switched rapidly and comprises a rotor in the form of a sector and a valve body which is concentric with the rotor and acts as a stator. The center of the rotor is provided with an air inlet which is communicated with the radial hole. Two holes forming a certain included angle are distributed on the inner cylindrical surface of the valve body along the circumferential direction. A hole in the radial direction of the rotor is aligned with a hole in the valve body, clockwise or anticlockwise torque is applied to the rotor through a rotating electromagnet, the rotor rotates by a fixed angle, the hole in the radial direction of the rotor is aligned with the other hole in the valve body, and switching between two air passages is achieved. Disadvantages of the PCT patent application WO2012042255a1 valve: 1. the contact surface of the rotor and the stator is a cylindrical surface, so that pre-tightening force cannot be applied in the radial direction, and the sealing property is difficult to guarantee. 2. Ensuring a reliable seal by reducing the clearance will result in increased machine costs and increased rotational friction, further affecting switching speed.

SUMMERY OF THE UTILITY MODEL

To the problem in the background art, the utility model aims at providing a novel butterfly valve. The air-conditioning system has the advantages of simple structure, rapid switching, small air pressure loss, low noise and small leakage amount.

The utility model provides a sealing ring, include: a ring-shaped body; and a boss protruding from the inner side of the body toward the center of the body, the boss being for forming a face seal with an external seal member.

Preferably, the number of the bosses is two, and the bosses are respectively located on one side of the inner side of the main body.

Preferably, the boss is arcuate.

Preferably, the boss is semi-circular.

Preferably, the two bosses are equal in width.

Preferably, the width of the boss is half of the width of the body.

Preferably, the main body is provided with shaft holes at two symmetrical ends.

Preferably, the boss extends to an edge of the shaft hole.

The utility model discloses a beneficial effect of sealing washer does:

the sealing device is particularly suitable for being used under the condition of large drift diameter, and has the advantages of simple structure, high sealing reliability, low air flow pressure loss and low noise. When the butterfly valve is applied to a butterfly valve, the whole set of butterfly valve is simple in structure, convenient to assemble and low in manufacturing cost.

The utility model discloses utilize the special design of valve clack and sealing washer, realize two kinds of sealing methods simultaneous action, improved the leakproofness of butterfly valve. Because the butterfly valve adopts the structure that the upper and lower semicircular surfaces are synchronously sealed, compared with the shutter valve described in CN201510232543.0, the length of the force arm of the valve clack of the butterfly valve is only half of the shutter valve plate, the impact generated by closing the valve on the valve port is small, and the valve port of the butterfly valve is made of flexible materials, so that the generated noise is small. The noise generated when the butterfly valve is tested is more than 10dB lower than that of the product disclosed in the patent CN 201510232543.0.

The internal drift diameter of the butterfly valve is basically consistent, and the pipeline has no bend, so that the pressure loss of the air flow is reduced to the minimum.

The butterfly valve of the utility model has been tested in the expectoration machine, and has good effect in manufacturing, installation and use; after 20 ten thousand life tests, the control requirement of the expectoration machine on expectoration airflow in the expectoration process can be met.

Drawings

Fig. 1 is a perspective view of the butterfly valve of the present invention.

Fig. 2 is a cross-sectional view of the butterfly valve of fig. 1.

Fig. 3 is a perspective view of the butterfly valve of the present invention, in which the housing and the sealing ring are removed.

Fig. 4 is a perspective view of the seal ring of the butterfly valve of the present invention.

Fig. 5 is a partial enlarged view of the sealing ring of the butterfly valve according to the present invention.

Fig. 6 is a cross-sectional view of the sealing ring of the butterfly valve of the present invention.

Fig. 7 is a perspective view of the valve flap of the butterfly valve of the present invention.

Fig. 8 is a top view of the valve flap of the butterfly valve of the present invention.

Fig. 9 is a schematic view of a local structure of the butterfly valve of the present invention when the valve flap is opened.

Fig. 10 is a schematic view of a partial structure of the butterfly valve of the present invention when the valve flap is closed.

Fig. 11 is a cross-sectional view of the butterfly valve of the present invention with the valve flap open.

A shell-1; a sealing ring-2; a boss-21; a shaft hole-22; a valve clack-3; a flap shaft-31; a first seal-32; a second seal-33; a central vertical plane-34; a first sealing surface 35; a second sealing surface 36; a bearing-4; a drive member 5; an output shaft-51.

Detailed Description

Embodiments of the present invention will now be described with reference to the drawings, wherein like parts are designated by like reference numerals. The embodiments described below and the technical features of the embodiments may be combined with each other without conflict.

Fig. 1 shows a perspective view of a butterfly valve of the present invention, and fig. 2 shows a cross-sectional view of the butterfly valve of fig. 1. As shown in figure 1, the butterfly valve of the invention comprises a shell 1, wherein the shell 1 is formed by the involution of a front shell and a rear shell, and the front shell and the rear shell can be fastened together through bolts.

Inside the housing 1, a valve flap 3 is provided, the valve flap 3 being surrounded by a sealing ring 2 (e.g., a rubber ring), the sealing ring 2 and the valve flap 3 being located in the middle of the front and rear housings in the mating relationship. The driving member 5 provides a rotation torque, and the driving member 5 may be a single or double direction rotary electromagnet, a rotary cylinder, a motor, or the like capable of outputting a rotation motion. In a preferred embodiment, a two-way electromagnet is used. The driving part 5 is fixed with the housing 1 (respectively to the front and rear housings) by 2 bolts to form a complete butterfly valve, as shown in fig. 2.

Fig. 3 shows a perspective view of the butterfly valve with the housing 1 and the sealing ring 2 removed for clarity. As can be seen with reference to fig. 2 to 3, the end of the drive member 5 has an output shaft 51, and the rotational torque of the drive member 5 is output through the output shaft 51. The output shaft 51 is inserted into the housing 1 in an extending manner, and is located in the middle between the front and rear housings. The output shaft 51 of the drive part 5 is connected, preferably in a plug-in manner, to the flap shaft 31 of the flap 3.

The sealing ring 2 is a sealing element of the butterfly valve, and the relative position relationship between the sealing ring 2 and the valve clack 3 has important influence on the sealing performance and the switch response performance of the butterfly valve. The invention provides a novel sealing ring and a valve clack. As shown in fig. 4, the seal ring 2 has a circular ring structure, two shaft holes 22 are provided at both ends of a central axis on the circumference of a circular ring-shaped seal ring main body, two bosses 21 (may be semicircular) are provided on an inner ring of the seal ring 2 with the two shaft holes 22 as a boundary, and the two bosses 21 extend up to the shaft holes at both ends. The projections 21, because they occupy only half of the sealing ring 2, are spaced between the shaft bore 22 on either side (front and rear in the figure with respect to the plane of the paper) by the same distance as the thickness of the valve flap 2, see fig. 5, which shows an enlarged view of a part of the sealing ring 2 viewed from the inside, fig. 5. Fig. 6 shows a cross-sectional view of the sealing ring 2 from the inside. As can be seen from fig. 5, the two bosses 21 extend only to the edge of the shaft hole 22, and do not block the shaft hole 22. Thus, the two bosses 21 are separated by a space H therebetween for accommodating the valve flap 3. Preferably, the width of the gap H is the same as the thickness of the flap 3, and the diameter of the shaft hole 22 matches the diameter of the flap shaft 31 of the flap 3. As shown in fig. 8, in one embodiment, the thickness of the flap 3 is the diameter of the flap axis 31.

FIG. 7 illustrates one embodiment of a valve flap of a butterfly valve of the present invention. The valve flap 3 includes: a flap shaft 31, a first seal 32 and a second seal 33. The flap shaft 31 incorporates a first seal 32 on one side and a second seal 33 on the opposite side. The combination of the flap shaft 31 with the semi-circular seal 32 and the second seal 3 is smooth and staggered so that a portion of the cylindrical surface of the flap shaft 31 forms a central vertical plane 34. Fig. 8 is a plan view of the valve flap 3, in which the positional relationship of the flap shaft 31, the first seal 32, and the second seal 33 is clear. Preferably, the first seal 32 and the second seal 33 are of the same thickness and are both equal to the radius of the flap axis 31, so that the vertical central plane 34 is a cylindrical surface of the flap axis 31 at 1/4. Further, the radii of the first seal 32 and the second seal 33 are identical to the radius of the seal ring 2. The top of the flap shaft 31 has a recess to receive the output shaft 51 of the drive member 51 so that the two are plugged together, and when the output shaft 51 rotates, the flap shaft 31 also rotates, and thus the flap 3 rotates. The first and second seals 32 and 33 are smoothly and sealingly coupled to the flap shaft 31 or are integrally formed with the flap shaft 31.

The butterfly valve 3 is rotated in the seal ring 2 by the output shaft 51 of the drive member 5, and if the boss 21 is not provided inside the seal ring 2, the butterfly valve 3 can be freely rotated 360 degrees in the seal ring 2. However, when the two bosses 21 are rotated to a certain extent (at most, 180 degrees of rotation), the first seal 32 and the second seal 33 are stopped by the two bosses 21, respectively, and the first seal 32 and the second seal 33 are in surface contact with the two bosses 21. The first sealing surface 35 of the first seal 32 comes into contact with the boss side surface and the second sealing surface 36 of the second seal 33 comes into contact with the boss side surface.

Alternatively, the boss may be of other shapes as long as it is capable of forming a face seal with the sealing faces of the two seals of the butterfly valve 3.

The operation of the butterfly valve of the present invention will now be described with reference to fig. 9-10. Fig. 9 shows a perspective view of a position and an angle of the flap 3 inside the sealing ring 2, which position effects the opening of the butterfly valve. And figure 10 shows a perspective view of another position and another angle of the flap 3 inside the sealing ring 2, which position achieves the sealing of the butterfly valve.

As shown in fig. 9, when the butterfly valve needs to be closed, the valve flap 3 is driven by the driving part 5 to rotate counterclockwise (arrow B direction in the figure) until the first sealing element 32 and the second sealing element 33 of the valve flap 3 are stopped (closely overlapped) by the boss 21 of the sealing ring 2, respectively, so as to achieve sealing. Through the two bosses 21 of the sealing ring 2, the invention not only utilizes the circumference of the valve clack 3 to carry out line sealing, but also utilizes the sealing surfaces of the two semicircular sealing pieces of the valve clack to carry out surface sealing relative to the bosses 21, and the two sealing modes act simultaneously, thereby obviously improving the sealing performance of the butterfly valve.

As shown in fig. 10, the butterfly valve is in a sealed state, when the butterfly valve needs to be opened, the valve clack 3 rotates clockwise (arrow F direction) until it rotates 90 degrees or an angle, so that the first sealing member 32 and the second sealing member 33 of the valve clack 3 are offset from the radial direction of the seal ring 2 by a certain angle. Because the distance between the two bosses 21 is the same as the thickness of the valve flap 3 at the position of the shaft hole 22 of the sealing ring 2, when the valve flap 3 rotates 90 degrees (as shown in fig. 9), the bosses 21 of the sealing ring 2 can play a role in limiting. Fig. 11 shows a cross-sectional view of a butterfly valve in an open state.

The above-described embodiments are merely preferred embodiments of the present invention, and general changes and substitutions by those skilled in the art within the technical scope of the present invention are included in the protection scope of the present invention.

Claims (7)

1. A seal ring, comprising:

the ring-shaped main body is provided with two shaft holes (22) at two ends of the central axis of the main body;

the sealing device comprises two bosses (21) positioned on two sides of the shaft hole, wherein the bosses (21) protrude from the inner side of the main body to the center of the main body in the radial direction, the side surfaces of the bosses are used for stopping an external sealing piece, and the bosses and the external sealing piece form surface sealing.

2. The seal ring according to claim 1,

the boss (21) is arc-shaped.

3. The seal ring according to claim 1,

the boss (21) is semicircular.

4. The seal ring according to claim 1,

the two bosses (21) are equal in width.

5. The seal ring according to claim 4,

the width of the boss (21) is half of the width of the main body.

6. The seal ring according to claim 1,

the symmetrical both ends of main part are provided with shaft hole (22).

7. The seal ring according to claim 6,

the boss (21) extends to the edge of the shaft hole (22).

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