CN210153241U - Control valve - Google Patents

Abstract

The utility model provides a control valve includes pneumatic film actuating mechanism, installs at the support of pneumatic film actuating mechanism below, be located support inside valve rod, be located support below last valve gap, install valve body, the case of fixed connection in the valve rod bottom, be located the inside disk seat of valve body in last valve gap below, the mounting hole has been seted up at the central point of going up the valve gap, have in the mounting hole and play location and guide cylinder of guide effect to the valve rod, the utility model discloses control valve passes through the direction design of guide cylinder, makes the guide orientation precision of valve rod improve greatly to make the axiality error between valve gap, guide cylinder, the case three reduce, have very big improvement to control valve's sealing performance, and the design of guide cylinder makes and reduces an outer leak source between valve gap and the valve body, makes control valve structure compacter, and the part is few, easy maintenance.

Description

Control valve

[ technical field ] A method for producing a semiconductor device

The utility model relates to an industrial automation control field specifically is a control valve.

[ background of the invention ]

In the automatic control of modern plants, control valves play a very important role, and the production of products depends on the correct distribution and control of the flowing medium. These controls, whether energy exchange, pressure reduction, or simple vessel charging, require some final control element to accomplish. The main function of the control valve is to regulate the pressure, flow rate, temperature and other parameters of the medium, and is the final control element in the process loop. The valve body variety of governing valve is many, and the valve body variety commonly used has single seat, angular form, tee bend, eccentric rotation, butterfly etc. and the applicable temperature range of current single seat governing valve on the market changes great, and guide structure adopts the leading truck support frame more, therefore the valve part is more relatively, and raw and other materials use more, and manufacturing cost is higher, and market competition advantage is little.

Therefore, the problem to be solved in the art is to provide a novel control valve which has a simple structure and reduces the number of parts.

[ Utility model ] content

To the above problem, the utility model discloses the control valve makes the guiding orientation precision of valve rod improve greatly through the direction design of guide cylinder to make the axiality error between valve gap, guide cylinder, the case three reduce, have very big improvement to the sealing performance of control valve.

For solving the problem, the utility model discloses the control valve includes pneumatic film actuating mechanism, installs at the support of pneumatic film actuating mechanism below, is located the inside valve rod of support, is located the last valve gap of support below, installs valve body, the case of fixed connection in the valve rod bottom of last valve gap below, is located the inside disk seat of valve body, the mounting hole has been seted up to the central part portion of going up the valve gap, have in the mounting hole and play location and guide effect's guide cylinder to the valve rod, pneumatic film actuating mechanism is connected on the valve rod top, and the bottom is connected to the case after passing the guide cylinder, drives valve rod reciprocating motion through pneumatic film actuating mechanism to this relative position who changes case and disk seat realizes the regulation and the control function of control valve.

Furthermore, a thin-walled tube is arranged at the opening of the mounting hole.

Furthermore, the bottom of the guide cylinder is folded from the edge to the center to form a chamfer, after the guide cylinder is placed in the mounting hole, the thin-walled tube is processed into a shape fitting the chamfer of the guide cylinder, and therefore the guide cylinder is fixed in the mounting hole.

Furthermore, the valve rod and the valve core are of an integrated structure, and a polytetrafluoroethylene soft material is installed on the working surface of the valve core, so that a VI-level leakage standard soft sealing structure is formed.

Furthermore, the valve body is designed into a low flow resistance flow channel with a constant cross section according to the fluid mechanics principle, namely, the cross sections of all parts of the flow channel are equal.

Furthermore, the utility model discloses the design that the control valve passes through the guide cylinder makes and goes up and reduce an outer leak source between valve gap and the valve body, makes the control valve structure compacter, and the part is few, easy maintenance.

[ description of the drawings ]

Fig. 1 is a schematic structural diagram of the control valve of the present invention.

Fig. 2 is a partially enlarged view of a portion a in fig. 1.

[ detailed description ] embodiments

The directional terms of the present invention, such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side", etc., are only directions in the drawings, and are only used for explaining and explaining the present invention, but not for limiting the scope of the present invention.

Referring to fig. 1 to 2, the utility model discloses the component structure of control valve is given, it is including the pneumatic membrane actuating mechanism 1 that is located the control valve top, install support 2 in pneumatic membrane actuating mechanism below, be located support inside valve rod 3, be located the last valve gap 4 of support below, install valve body 5, the case 6 of fixed connection in the valve rod 3 bottom, be located the inside disk seat 7 of valve body in last valve gap below. The bottom of the pneumatic membrane actuating mechanism 1 is fixedly connected with the top of the support 2, and the valve rod 3 is connected to the pneumatic membrane actuating mechanism 1 after penetrating through the support 2, so that the pneumatic membrane actuating mechanism 1 can reciprocate up and down under the action of the pneumatic membrane actuating mechanism 1. The upper valve cover 4 is fixedly connected with the valve body 5 through a bolt 8, a valve cover sealing gasket 9 is arranged on a contact surface between the upper valve cover 4 and the valve body 5, the valve core 6 and the valve rod 3 are of an integrally formed structure, connection failure caused by vibration of a split structure is avoided, safety accidents caused by falling of the head of the valve core are prevented, the valve core 6 is an all-metal sealing valve core, and a polytetrafluoroethylene soft material is arranged on a working surface of the valve core, so that a VI-level leakage standard soft sealing structure is formed, the valve body 5 is designed into a uniform-section low-flow-resistance flow channel according to a fluid mechanics principle, namely, sectional areas of all parts of the flow channel are equal, fluid is prevented from forming turbulent flow or turbulent flow due to sudden enlargement or reduction of the sectional area of the flow channel or an irregular profile, and the excessive fluid pressure loss and energy consumption.

Referring to fig. 2, a mounting hole 401 is formed in the center of the upper bonnet 4, a guide cylinder 402 for positioning and guiding the valve rod 6 is arranged in the mounting hole, a thin-walled tube 403 is arranged at an opening of the mounting hole 401, the mounting hole 401 has a wide portion and a narrow portion, the guide cylinder 402 is mounted in the wide portion, the valve rod 3 sequentially passes through the narrow portion and the guide cylinder and then is connected to the valve core 6, the bottom of the guide cylinder 402 is drawn from the edge to the center to form a chamfer, the guide cylinder is placed in the mounting hole, and then the thin-walled tube 403 is processed into a shape fitting the chamfer of the guide cylinder, so that the guide cylinder is fixed in the mounting hole. The control valve drives the valve rod 3 and the valve core 6 to reciprocate by outputting power through the pneumatic membrane actuating mechanism 1, the valve core 3 moves downwards and cuts off fluid in the valve body 5 by applying certain sealing force after contacting with the valve seat 7, so that the control valve forms a closed state, and when the valve rod and the valve core are lifted upwards, the position relation between the valve core and the valve seat is changed, so that the flow and the pressure of the fluid in the valve body are changed, and the adjusting and controlling functions of the control valve are realized. The utility model discloses the control valve passes through the direction design of guide cylinder, makes the guiding orientation precision of valve rod improve greatly to make the axiality error between valve gap, guide cylinder, the case three reduce, have very big improvement to the sealing performance of control valve, and the design of guide cylinder makes and goes up the outer leak source that reduces between valve gap and the valve body, makes the control valve structure compacter, and the part is few, easy maintenance.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (5)

1. A control valve is characterized by comprising a pneumatic membrane actuating mechanism (1), a bracket (2) arranged below the pneumatic membrane actuating mechanism, a valve rod (3) positioned in the bracket, an upper valve cover (4) positioned below the bracket, a valve body (5) arranged below the upper valve cover, a valve core (6) fixedly connected to the bottom of the valve rod (3), and a valve seat (7) positioned in the valve body, the center part of the upper valve cover (4) is provided with a mounting hole (401), a guide cylinder (402) which plays a role in positioning and guiding the valve rod (3) is arranged in the mounting hole, the top end of the valve rod (3) is connected with a pneumatic film actuating mechanism, the bottom end of the valve rod penetrates through the guide cylinder and then is connected with the valve core (6), the valve rod is driven by the pneumatic membrane actuating mechanism to reciprocate, so that the relative position of the valve core and the valve seat is changed, and the adjusting and controlling functions of the control valve are realized.

2. The control valve according to claim 1, characterized in that the mounting hole (401) is provided with a thin-walled tube (403) at its opening.

3. The control valve of claim 2, wherein the bottom of the guide cylinder (402) is tapered from the edge to the center to form a chamfer, and after the guide cylinder is placed in the mounting hole, the thin-walled tube (403) is machined to conform to the chamfer of the guide cylinder, thereby fixing the guide cylinder in the mounting hole.

4. The control valve according to claim 1, characterized in that the valve rod (3) and the valve core (6) are of an integrated structure, and a polytetrafluoroethylene soft material is arranged on a working surface of the valve core, so that a soft sealing structure meeting the VI-level leakage standard is formed.

5. The control valve according to claim 1, characterized in that the valve body (5) is designed as a flow channel with a low flow resistance of constant cross section according to the principle of fluid mechanics, i.e. the cross section area is equal throughout the flow channel.

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