CN102425678A - Mobile sealed valve - Google Patents

Abstract

The invention discloses a movable sealing valve, which belongs to the technical field of valves, and its technical points include a valve body in which a valve core is arranged, wherein the valve body is provided with a movable valve seat matched with the valve core, There is a positioning groove on the valve body, and the movable valve seat is movably arranged in the positioning groove, and the moving valve seat cooperates with the positioning groove to form a closed pressure chamber, which is connected with an external pressure source pipeline, and through Driven by pressure, the movable valve seat moves between close to the valve core and away from the valve core; the present invention aims to provide a compact, easy-to-use and effective movable sealing valve; used to control the flow of medium in the pipeline.

Description

Mobile sealing valve

technical field

The present invention relates to a valve, more particularly, to a movable sealing valve.

Background technique

In the use of various valves, ball valves and butterfly valves have a wide range of applications. It has the advantages of simple structure, fast switching and low failure rate. They all realize the switch by rotating the sphere or butterfly plate 90°. During the long-term use, people put forward higher requirements on the basis of the known advantages based on the experience of use and the feedback information under special working conditions. The main purpose is to achieve the requirements of "low wear, low loss, light torque, long life, environmental protection and energy saving" as mentioned above. Especially when it is used in low temperature, high temperature, high pressure, granular and powdery medium, it is more urgent to improve the structure to meet its use requirements. With the expansion of the application of hard-sealed ball valves and butterfly valves, it is also of urgent practical use to reduce the wear between the seals, reduce the torque required for switching, and prolong the service life of the valve. There are deficiencies in the sealing of ball valves and butterfly valves, mainly in the following aspects: (1) The sealing surface of the valve seat is tightly attached to the ball or butterfly plate for a long time, and the material of the valve seat (soft seal) is easily transformed from elastic deformation to plastic Deformation, which reduces sealing effectiveness over time. (2) In the frequent switching process, the sealing surface of the valve seat is always in friction with the ball or butterfly plate, which is easy to damage the sealing surface and affect the service life. (3) When the pipeline medium is granular or powdery, some medium is easy to adhere to the sealing surface, increasing friction and resistance during rotation. During the closing process, because the channel becomes narrower and narrower, the high-speed flowing medium is also easy to flush Corrosion of the sealing surface of the valve seat will affect the service life. (4) Since the sealing surface of the valve seat is in constant contact with the sphere or butterfly plate, a relatively large switching torque is required during the valve switching process. This situation will be more obvious for high-pressure and large-diameter valves. In the case of addressing the above-mentioned deficiencies, the method commonly used at present is to design the butterfly valve with double eccentricity and triple eccentricity. Although it can solve some problems, it increases the difficulty of manufacture. Ball valve designs include guide rod ball valves, eccentric hemispherical ball valves, elastic sleeve ball valves, etc. These improvements make the product structure complicated, the shape enlarged, the process difficulty increased, and the manufacturing cost increased. Due to these new structural elements, there is also wear and tear during operation, which is easily damaged, which in turn restricts the service life of the valve.

Contents of the invention

The object of the present invention is to provide a movable sealing valve with compact structure, convenient use and good effect in view of the above-mentioned deficiencies in the prior art.

The technical solution of the present invention is realized in the following way: a movable sealing valve includes a valve body, and a valve core is arranged in the valve body, wherein the valve body is provided with a movable valve seat matched with the valve core, and There is a positioning groove on the body, and the movable valve seat is set in the positioning groove. The movable valve seat cooperates with the positioning groove to form an airtight pressure chamber, which is connected to the external pressure source pipeline and driven by pressure. Moves the moving seat between close to and away from the spool.

In the above-mentioned movable sealing valve, the movable valve seat is an elastic member, and the elastic member cooperates with the positioning groove to form a closed pressure chamber, and a first through hole connected to an external pressure source pipeline is provided on the pressure chamber; When pressure is added to the pressure chamber, the elastic member expands towards the valve core and cooperates with the valve core to form a sealing surface; when the pressure in the pressure chamber is discharged, the elastic member shrinks and separates from the valve core.

In the above-mentioned movable sealing valve, the movable valve seat is composed of the movable seat and the driving convex strip arranged on the movable seat; the side wall of the positioning groove is provided with a groove adapted to the driving convex strip, so The above-mentioned pressure chamber is formed by a movable seat matched with a groove, and the above-mentioned driving protrusion is located in the pressure chamber, and the side walls of the pressure chamber on both sides of the driving protrusion are respectively provided with second through holes connected with external pressure source pipelines.

In the above-mentioned movable sealing valve, a first sealing ring is provided on the end surface of the movable seat opposite to the valve core.

In the above movable sealing valve, the contact portion between the moving seat and the positioning groove is provided with a second sealing ring.

In the above movable sealing valve, the external pressure source is a compressed air source.

After adopting the above-mentioned structure, the present invention realizes movable sealing by moving the valve seat and cooperating with the valve core. Turn the spool; when the spool needs to be half-closed, first turn the spool to the closed position, then move the valve seat to the closed position to cooperate with the spool to form a sealing surface. In this way, the valve core can be opened and closed without wear, which can greatly improve the service life of the valve, and at the same time ensure the sealing effect.

Description of drawings

The present invention will be described in further detail below in conjunction with the embodiments in the accompanying drawings, but this does not constitute any limitation to the present invention.

Fig. 1 is the structural representation of specific embodiment 1 of the present invention;

Fig. 2 is a partially enlarged schematic diagram of A when the valve in Fig. 1 is closed;

Fig. 3 is a partial enlarged schematic diagram of A when the valve is opened in Fig. 1;

Fig. 4 is the structural representation of specific embodiment 2 of the present invention;

Fig. 5 is a partially enlarged schematic diagram of place B when the valve is closed in Fig. 4;

Fig. 6 is a partially enlarged schematic diagram of place B when the valve is opened in Fig. 4;

Fig. 7 is a schematic structural view of a specific embodiment 3 of the present invention;

Fig. 8 is a partially enlarged schematic diagram at C when the valve in Fig. 7 is closed;

Fig. 9 is a partially enlarged schematic diagram at C when the valve is opened in Fig. 7;

Fig. 10 is a schematic structural view of Embodiment 4 of the present invention;

Fig. 11 is a partially enlarged schematic diagram at D when the valve in Fig. 10 is closed;

Fig. 12 is a partially enlarged schematic diagram at D when the valve is opened in Fig. 10;

In the figure: valve body 1, valve core 2, moving valve seat 3, positioning groove 4, pressure chamber 5, first through hole 6, moving seat 3a, driving convex strip 3b, second through hole 7, first sealing ring 8. The second sealing ring 9, the valve stem 10, the sleeve 11, and the valve shaft 12.

Detailed ways

Example 1

Application of the present invention in three-piece ball valve

Referring to Figures 1 to 3, a movable sealing valve of the present invention includes a valve body 1, the valve body is composed of left and right bodies and a middle body, a valve stem 10 is worn on the middle body, and a valve stem and a middle body are connected. There are conventional bushings, gaskets, sealing rings and other components between the contact parts of the body, a spherical valve core 2 is provided on the valve stem 10, and a ring-shaped moving valve that matches the valve core 2 is provided on the valve body 1. The valve seat 3 is provided with a positioning groove 4 on the valve body 1. The positioning groove 4 is composed of the valve body 1 and the sleeve 11 sleeved in the valve body 1. This structure facilitates the processing and forming of the positioning groove 4. , the movable valve seat 3 is movably arranged in the positioning groove 4, and the movable valve seat 3 cooperates with the positioning groove 4 to form an airtight pressure chamber 5, the pressure chamber 5 is connected with an external pressure source pipeline, driven by pressure to make The movable valve seat 3 moves between close to the valve core 2 and away from the valve core 2; specifically, the movable valve seat 3 is composed of a movable seat 3a and a driving protrusion 3b arranged on the movable seat 3a; the positioning groove 4 The side wall is provided with a groove compatible with the driving protrusion 3b, the moving seat 3a is movably arranged in the positioning groove 4, the pressure chamber 5 is formed by the moving seat 3a matching the groove, and the driving The convex line 3b is located in the pressure chamber 5, and the side walls of the pressure chamber 5 on both sides of the driving convex line 3b are respectively provided with second through holes 7 connected to external pressure source pipelines. The external pressure source in this embodiment is preferably The compressed air source is provided by the air compressor, and a solenoid valve is set on the pipeline connecting the two second through holes 7, and the opening and closing of the pipeline is controlled by the solenoid valve; further, the movable seat 3a and the valve core 2 A first sealing ring 8 is provided on the opposite end surface, and a second sealing ring 9 is provided at the contact portion between the moving seat 3 a and the positioning groove 4 .

In specific use, when the valve needs to be opened, the corresponding second through hole 7 is first opened through the solenoid valve, and the air pressure is filled into the pressure chamber 5 to drive the driving protrusion 3b to drive the moving seat 3a along the positioning groove 4 to move away from the valve core. 2, and then turn the spool 2; when the valve needs to be closed, first turn the spool 2 to the closed position, and then open another second through hole 7 through the solenoid valve, and close the previously opened second through hole 7. Drive the raised bar 3b by air pressure to drive the moving seat 3a to move along the positioning groove 4 toward the valve core 2, so that the first sealing ring 8 at the front end of the moving seat 3a contacts the valve core 2 to form a sealing surface. The volume of the pressure chamber 5 is calculated according to the sealing specific pressure required by the valve seal; the pressure of the airtight pressure chamber 5 and the movement speed of the moving valve seat 3 are calculated according to the nominal pressure of the valve and the valve caliber; when the valve is closed, the moving valve The moving speed of seat 3 should be controlled to prevent impact damage. So as to realize the performance of low wear, low loss, light torque, long life, environmental protection and energy saving of the valve.

Example 2

Application of the present invention in single seat hemispherical ball valve

Referring to Fig. 4 to Fig. 6, it is a specific way to apply the structure of a mobile sealing valve of the present invention to a single-seat hemispherical ball valve. The reason is that a movable valve seat is adopted, and the installation method and usage method of the movable valve seat 3 are the same as those in Embodiment 1, and the usage effect is also basically the same.

Example 3

One of the applications of the present invention in butterfly valves

Referring to Fig. 7 to Fig. 9, it is a specific way of applying the structure of a movable sealing valve of the present invention to a butterfly valve. Its structure is basically the same as that of a traditional butterfly valve, except that a movable valve seat is used , where the installation and use of the movable valve seat 3 are the same as those in Embodiment 1, and the use effects are basically the same.

Example 4

The second application of the present invention in butterfly valve

Referring to Figures 10 to 12, a movable sealing valve of the present invention includes a valve body 1, a valve shaft 12 is movable on the valve body 1, and a valve shaft 12 is provided between the contact portion of the valve shaft 12 and the valve body 1. There are conventional shaft sleeves, gaskets, sealing rings and other components, a butterfly plate-shaped valve core 2 is provided on the valve stem 10, and an annular movable valve seat 3 that matches the valve core 2 is provided on the valve body 1. The valve body 1 is provided with an annular positioning groove 4, and the positioning groove 4 is composed of the valve body 1 and the sleeve 11 sleeved in the valve body 1. This structure facilitates the processing and forming of the positioning groove 4. The moving valve seat 3 is movably set in the positioning groove 4, and the moving valve seat 3 cooperates with the positioning groove 4 to form an airtight pressure chamber 5. The pressure chamber 5 is connected to the external pressure source pipeline, and the moving valve seat is driven by pressure. 3 moves between close to the valve core 2 and away from the valve core 2; specifically, the movable valve seat 3 in this embodiment is an elastic member, and the elastic member cooperates with the positioning groove 4 to form a closed pressure chamber 5, and the pressure chamber 5 There is a first through hole 6 connected to the external pressure source pipeline; when the pressure is increased in the pressure chamber 5, the elastic member expands toward the valve core 2 and cooperates with the valve core 2 to form a sealing surface; when the pressure chamber 5 When the pressure is discharged, the elastic member shrinks and separates from the valve core 2, and then the valve core 2 rotates to complete the opening of the valve. Its mode of operation is basically the same as that of Embodiment 1.

The invention is mainly applicable to three-piece ball valves, single-seat hemispherical ball valves and butterfly valves. Applicable specifications are DN100～1000; pressure PN1.0～10Mpa; temperature -20°～450°. At the same time, it is suitable for both soft seal and hard seal.

Claims (6)

1. A movable sealing valve, comprising a valve body (1), is provided with a spool (2) in the valve body (1), is characterized in that, the valve body (1) is provided with a valve core (2) 2) The matching movable valve seat (3) is provided with a positioning groove (4) on the valve body (1). The seat (3) cooperates with the positioning groove (4) to form an airtight pressure chamber (5). The pressure chamber (5) is connected to the external pressure source pipeline, and the moving valve seat (3) is driven by pressure to move close to the valve core ( 2) and move away from the spool (2). 2. The movable sealing valve according to claim 1, characterized in that, the movable valve seat (3) is an elastic member, and the elastic member cooperates with the positioning groove (4) to form a closed pressure chamber (5), The pressure chamber (5) is provided with a first through hole (6) connected to the external pressure source pipeline; when the pressure is increased in the pressure chamber (5), the elastic member expands toward the valve core (2) and connects with the valve The core (2) cooperates to form a sealing surface; when the pressure in the pressure chamber (5) is discharged, the elastic member shrinks and separates from the valve core (2). 3. The movable sealing valve according to claim 1, characterized in that, the movable valve seat (3) is composed of a movable seat (3a) and a driving convex strip (3b) arranged on the movable seat (3a) ; The side wall of the positioning groove (4) is provided with a groove compatible with the driving protrusion (3b), and the pressure chamber (5) is formed by matching the groove of the moving seat (3a), and the The driving convex strip (3b) is located in the pressure chamber (5), and the side walls of the pressure chamber (5) on both sides of the driving convex strip (3b) are respectively provided with second through holes (7) connected to external pressure source pipelines . 4. The movable sealing valve according to claim 3, characterized in that a first sealing ring (8) is provided on the end surface of the movable seat (3a) opposite to the valve core (2). 5. The movable sealing valve according to claim 3, characterized in that a second sealing ring (9) is provided at the contact portion between the movable seat (3a) and the positioning groove (4). 6. The movable sealing valve according to any one of claims 1 to 5, wherein the external pressure source is a compressed air source.

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