Pneumatic explosion-proof ball valve

Abstract

The utility model discloses a pneumatic explosion-proof ball valve which comprises a valve body, a liquid inlet pipe and a liquid outlet pipe are fixed at the position of the valve body, a longitudinal channel is arranged in the valve body, a valve core is arranged in the valve body, a transverse through hole is arranged on the valve core, valve seats are arranged on the left side and the right side of the valve core, sealing rings are arranged on the two valve seats, and compression springs are arranged at the side ends of the two valve seats. Cylindrical rods are arranged at the upper end and the lower end of the valve element, a bearing is arranged at the longitudinal channel, a thrust bearing is arranged at the longitudinal channel, a limiting plate is placed at the top end of the thrust bearing, the limiting plate and the cylindrical rod on the upper side are fastened together, a valve rod is arranged on the cylindrical rod on the upper side, a valve cover is arranged at the top end of the valve body, and a rotating air cylinder is arranged on the valve cover. A pressure relief cavity is formed between the bottom end of the longitudinal channel and the lower side bearing, a pressure relief channel is formed between the bottom face of the lower side cylindrical rod and the transverse through hole, and a connecting pipe is arranged between the bottom of the pressure relief cavity and the liquid outlet pipe. The explosion-proof power supply has an explosion-proof effect and is worthy of popularization and application.

Description

Technical Field

[0001] The utility model relates to the field of valves, in particular to a ball valve, and more particularly to a pneumatic explosion-proof ball valve. Background Art

[0002] A ball valve is a valve in which the closing member is driven by a valve stem and rotates around the axis of the ball valve, and can also be used for the regulation and control of fluids; during the rotation of the current ball valve spool, the fluid in the valve body will be squeezed, resulting in a sharp increase in the pressure in the valve body in a short time. Therefore, for a valve body with production defects or insufficient strength, the valve body is extremely likely to burst.

[0003] Chinese Utility Model Patent CN 208651684 U discloses a ball valve, which includes: a valve body, a spool ball, a valve stem, and a first seal; the spool ball is arranged in the valve cavity of the ball valve; the valve stem includes a valve stem body and a radial boss, a part of the valve stem body extends into the valve cavity, the valve stem can drive the spool ball to rotate in the valve cavity, and the radial boss is located in the valve cavity; the first seal is arranged between the upper end of the radial boss and the valve body; the radial boss includes a rib opposite to the lower end of the first seal, and the rib can abut against the first seal, the valve body includes a valve body main body part and a guiding part communicating with the valve body main body part, a part of the valve stem extends into the guiding part, and a second seal is arranged between the inner wall of the guiding part and the valve stem. This ball valve seals the spool with a sealing ring. Such a ball valve will cause a sharp increase in the pressure in the valve body in a short time when the spool rotates and in a high-pressure medium environment, which is extremely likely to cause the valve body to burst, thus affecting the use safety. Summary of the Utility Model

[0004] The utility model aims to solve the above-mentioned drawbacks of the prior art, and provides a pneumatic explosion-proof ball valve that can quickly relieve the pressure of high-pressure media after the spool rotates, thereby avoiding the bursting of the valve body, and meeting the requirements of explosion-proof, long service life and safe use of the ball valve.

[0005] The technical solution adopted by the utility model to solve its technical problems: This pneumatic explosion-proof ball valve includes a valve body. An inlet pipe and an outlet pipe are fixed to the valve body. A longitudinal channel connecting the inlet pipe and the outlet pipe is opened in the valve body. A valve core for opening and closing the longitudinal channel is installed in the valve body. A transverse through hole is opened in the valve core. Valve seats inserted on the valve body are provided on both the left and right sides of the valve core. Sealing rings are installed on the opposite surfaces of the two valve seats. Compression springs for pressing the two valve seats towards the spherical surface direction of the valve core are installed at the side ends of the two valve seats. Cylindrical rods are fixed to both the upper and lower ends of the valve core. A pair of upper and lower bearings are installed in the longitudinal channel. Both cylindrical rods are sleeved on the inner rings of the two bearings. A thrust bearing is installed in the longitudinal channel above the upper side bearing. A limiting plate is placed on the top end of the thrust bearing. The limiting plate is fastened together with the upper side cylindrical rod. A valve stem is installed on the upper side cylindrical rod. A valve cover is fixed to the top end of the valve body. A rotary cylinder for driving the valve stem to rotate is fixed to the valve cover; A pressure relief cavity is provided between the bottom end of the longitudinal channel and the lower side bearing. A pressure relief channel communicating with the pressure relief cavity is opened between the bottom surface of the lower side cylindrical rod and the transverse through hole. A connecting pipe is installed between the bottom of the pressure relief cavity and the outlet pipe. The functions of the inlet pipe and the outlet pipe here are to connect the pipelines; The function of the valve core here is to open and close the medium; The functions of the valve seat, the sealing ring, and the compression spring here are to tightly seal the valve core and, when the sealing ring wears, compensate for the position of the sealing ring, thereby improving the service life of the sealing ring; The functions of the cylindrical rod, the bearing, the thrust bearing, and the limiting plate here are to provide lateral and longitudinal support for the valve core, so as to be able to withstand a greater lateral load force of the medium and also avoid excessive medium pressure acting on the sealing ring, which may cause the sealing ring to wear too quickly and affect the service life of the sealing ring; The functions of the valve stem and the rotary cylinder here are to rotate the valve core, so that the ball valve is in a fully open state or a fully closed state; The functions of the pressure relief cavity and the connecting pipe here are that when the valve core is rotated and opened, the pressure in the valve body surges. At this time, through the pressure relief channel and then through the connecting pipe, the pressure is quickly discharged, thereby avoiding the situation where the valve body bursts due to the rapidly increasing pressure in a short time; The rotary cylinder is an existing product on the market. A rotary cylinder that can rotate 90 degrees can be selected to meet the requirement of quickly opening and closing the ball valve. The rotary cylinder adopts products from companies such as Yueqing Tengyu Pneumatic and Hydraulic Co., Ltd. and Shanghai Ruanlong Industrial Automation Electric Co., Ltd.

[0006] For further improvement, a group of first reinforcing ribs evenly arranged along the center of the limiting plate are fixed to the top end of the limiting plate. The function of the first reinforcing rib here is to enable the limiting plate to increase its strength, reduce its bending degree, and be able to withstand a higher longitudinal load.

[0007] For further improvement, a group of second reinforcing ribs are fixed between the inlet pipe and the valve body and between the outlet pipe and the valve body. The function of the second reinforcing rib here is to greatly improve the strength of the inlet pipe and the outlet pipe at the valve body.

[0008] Further improvement: dovetail grooves are provided on both sides of the two valve seats, which are respectively opened at the liquid inlet pipe and the liquid outlet pipe. Round pipes respectively matched with the two dovetail grooves are fixed at the side ends of the two valve seats. O-ring seals matched with the round pipes are respectively installed on the liquid inlet pipe and the liquid outlet pipe. The functions of the dovetail grooves, round pipes, and O-ring seals are to prevent the medium from contacting the compression spring, thereby avoiding corrosion of the compression spring and preventing the service life of the compression spring from being significantly reduced.

[0009] Further improvement: a first self-lubricating layer is provided on the outer contour surface of the valve seat, and a second self-lubricating layer is provided on the outer contour surface of the round pipe. The functions of the first self-lubricating layer and the second self-lubricating layer are to greatly reduce the frictional resistance generated when the valve seat moves, making the valve seat move more smoothly, thereby avoiding the situation of the valve seat getting stuck.

[0010] Further improvement: threaded assembly sections are provided at the outer ends of the liquid inlet pipe and the liquid outlet pipe. The function of the threaded assembly sections is to facilitate the docking and installation of the pipes.

[0011] The beneficial effects of the present utility model are as follows:

[0012] 1). When the pressure increases sharply by rotating the valve core, it can quickly relieve the pressure of the medium, thereby avoiding the bursting of the valve body;

[0013] 2). It can provide longitudinal support for the valve core and resist the medium pressure horizontally. As a result, not only is it easy to rotate the valve core, but also for the sealing ring on the pressure-bearing surface, the frictional resistance is small and the service life is long;

[0014] 3). By rotating the cylinder, the ball valve can be quickly and labor-savingly opened and closed, so as to achieve a fast response speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a perspective view of the present utility model;

[0016] Figure 2 is a structural schematic diagram of the present utility model;

[0017] Figure 3 is Figure 2 a partial enlarged view of area A of

[0018] Figure 4 is a structural schematic diagram of the thrust bearing area in the present utility model;

[0019] Figure 5 is a structural schematic diagram of the pressure relief channel area in the present utility model;

[0020] Figure 6 is a state diagram of the present utility model in the closed state.

[0021] Description of the reference numerals: valve body 1, liquid inlet pipe 1-1, liquid outlet pipe 1-2, longitudinal channel 1-3, pressure relief cavity 1-3a, dovetail groove 1-4, valve core 2, transverse through hole 2a, pressure relief channel 2b, cylindrical rod 2-1, valve seat 3, round pipe 3-1, second self-lubricating layer 3-1a, first self-lubricating layer 3-2, sealing ring 4, compression spring 5, bearing 6, thrust bearing 7, limiting plate 8, valve stem 9, valve cover 10, rotary cylinder 11, connecting pipe 12, first reinforcing rib 13, second reinforcing rib 14, O-ring 15, threaded assembly section 16. Detailed implementation mode

[0022] The present utility model will be further described below with reference to the accompanying drawings:

[0023] Referring to the accompanying drawings: This pneumatic explosion-proof ball valve includes a valve body 1, a liquid inlet pipe 1-1 and a liquid outlet pipe 1-2 are fixed at the valve body 1, a longitudinal channel 1-3 connecting the liquid inlet pipe 1-1 and the liquid outlet pipe 1-2 is opened in the valve body 1, a valve core 2 for opening and closing the longitudinal channel 1-3 is installed in the valve body 1, a transverse through hole 2a is opened on the valve core 2, valve seats 3 inserted on the valve body 1 are arranged on both the left and right sides of the valve core 2, sealing rings 4 are installed on the opposite surfaces of the two valve seats 3, compression springs 5 for pressing the two valve seats 3 towards the spherical surface direction of the valve core 2 are installed at the side ends of the two valve seats 3, cylindrical rods 2-1 are fixed at both the upper and lower ends of the valve core 2, a pair of upper and lower bearings 6 are installed at the longitudinal channel 1-3, both cylindrical rods 2-1 are sleeved on the inner rings of the two bearings 6, a thrust bearing 7 is installed at the longitudinal channel 1-3 above the upper side bearing 6, a limiting plate 8 is placed on the top end of the thrust bearing 7, the limiting plate 8 and the upper side cylindrical rod 2-1 are fastened together, a valve stem 9 is installed on the upper side cylindrical rod 2-1, a valve cover 10 is fixed at the top end of the valve body 1, and a rotary cylinder 11 for driving the valve stem 9 to rotate is fixed on the valve cover 10; a pressure relief cavity 1-3a is arranged between the bottom end of the longitudinal channel 1-3 and the lower side bearing 6, a pressure relief channel 2b communicating with the pressure relief cavity 1-3a is opened between the bottom surface of the lower side cylindrical rod 2-1 and the transverse through hole 2a, and a connecting pipe 12 is installed between the bottom of the pressure relief cavity 1-3a and the liquid outlet pipe 1-2.

[0024] A group of first reinforcing ribs 13 evenly arranged along the center of the limiting plate 8 are fixed at the top end of the limiting plate.

[0025] A group of second reinforcing ribs 14 are fixed between the liquid inlet pipe 1-1 and the valve body 1 and between the liquid outlet pipe 1-2 and the valve body 1.

[0026] Dovetail grooves 1-4 are respectively opened at the liquid inlet pipe 1-1 and the liquid outlet pipe 1-2 on both sides of the two valve seats 3, round pipes 3-1 respectively matched with the two dovetail grooves 1-4 are fixed at the side ends of the two valve seats 3, and O-rings 15 matched with the round pipes 3-1 are respectively installed on the liquid inlet pipe 1-1 and the liquid outlet pipe 1-2.

[0027] A first self-lubricating layer 3-2 is provided on the outer contour surface of the valve seat 3, and a second self-lubricating layer 3-1a is provided on the outer contour surface of the circular pipe 3-1.

[0028] Threaded assembly sections 16 are provided at the outer ends of the liquid inlet pipe 1-1 and the liquid outlet pipe 1-2.

[0029] The working principle of the present utility model is as follows: First, install this explosion-proof ball valve on the pipeline. When it is necessary to open the pipeline, only need to start the rotary cylinder 11, so that the rotary cylinder 11 drives the valve stem 9 to rotate rapidly. Since the valve core 2 is supported horizontally against the medium pressure and longitudinally by the bearing 6 and the thrust bearing 8, the rotation resistance of the valve core 2 is small, and the valve core 2 is rotated rapidly. During the short time when the valve core 2 rotates, the pressure in the valve body 1 increases sharply. At this time, through the rapid pressure relief of the pressure relief channel 2b and the connecting pipe 12, the situation that the pressure in the valve body 1 increases too fast and causes the valve body 1 to burst is avoided. At the same time of pressure relief, the medium pressure is discharged through the horizontal through hole 2a, so as to meet the requirements of high efficiency, rapidity and safety in the pipeline application, and it is worthy of popularization and application.

[0030] Although the present utility model has been illustrated and described by referring to the preferred embodiments, those of ordinary skill in the art should understand that various changes in form and details can be made within the scope of the claims.

Claims

1. A pneumatic explosion-proof ball valve, comprising a valve body (1), characterized in that: The valve body (1) is fixed with a liquid inlet pipe (1-1) and a liquid outlet pipe (1-2). The valve body (1) is provided with a longitudinal passage (1-3) connecting the liquid inlet pipe (1-1) and the liquid outlet pipe (1-2). The valve body (1) is provided with a valve core (2) for opening and closing the longitudinal passage (1-3). The valve core (2) is provided with a transverse through hole (2a). The left and right sides of the valve core (2) are provided with valve seats (3) plugged into the valve body (1). Sealing rings (4) are provided on the opposite surfaces of the two valve seats (3). Compression springs (5) for driving the two valve seats (3) to press toward the spherical surface of the valve core (2) are provided at the side ends of the two valve seats (3). A cylindrical rod (2-1) is fixed to the upper and lower ends of the valve core (2). A pair of upper and lower bearings (6) are provided at the longitudinal passage (1-3). The two cylindrical rods (2-1) are sleeved on the two bearings ( 6) at the inner ring, a thrust bearing (7) located above the bearing (6) on the upper side is installed at the longitudinal channel (1-3), a limit plate (8) is placed on the top of the thrust bearing (7), the limit plate (8) is fastened to the cylindrical rod (2-1) on the upper side, a valve stem (9) is installed on the cylindrical rod (2-1) on the upper side, a valve cover (10) is fixed on the top of the valve body (1), and a rotary cylinder (11) for driving the valve stem (9) to rotate is fixed on the valve cover (10); a pressure relief chamber (1-3a) is provided between the bottom end of the longitudinal channel (1-3) and the bearing (6) on the lower side, a pressure relief channel (2b) connected to the pressure relief chamber (1-3a) is provided between the bottom surface of the cylindrical rod (2-1) on the lower side and the transverse through hole (2a), and a connecting pipe (12) is installed between the bottom of the pressure relief chamber (1-3a) and the liquid outlet pipe (1-2).

2. The pneumatic explosion-proof ball valve according to claim 1 is characterized in that: A group of first reinforcing ribs (13) arranged along the center of the limiting plate (8) are fixed to the top end of the limiting plate (8).

3. The pneumatic explosion-proof ball valve according to claim 1 is characterized in that: A group of second reinforcing ribs (14) is fixed between the liquid inlet pipe (1-1) and the valve body (1), and between the liquid outlet pipe (1-2) and the valve body (1).

4. The pneumatic explosion-proof ball valve according to claim 1 is characterized in that: Dovetail grooves (1-4) are provided on both sides of the two valve seats (3) and are respectively opened at the liquid inlet pipe (1-1) and the liquid outlet pipe (1-2). Round tubes (3-1) respectively matching the two dovetail grooves (1-4) are fixed to the side ends of the two valve seats (3). O-rings (15) matching the round tubes (3-1) are respectively installed on the liquid inlet pipe (1-1) and the liquid outlet pipe (1-2).

5. The pneumatic explosion-proof ball valve according to claim 4 is characterized in that: A first self-lubricating layer (3-2) is provided on the outer contour surface of the valve seat (3), and a second self-lubricating layer (3-1a) is provided on the outer contour surface of the circular tube (3-1).

6. The pneumatic explosion-proof ball valve according to claim 1 is characterized in that: The outer ends of the liquid inlet pipe (1-1) and the liquid outlet pipe (1-2) are both provided with threaded assembly sections (16).

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