Pneumatic control valve

Abstract

A diaphragm is annularly and evenly provided with a plurality of lower end spring seats and guide rods, the lower end spring seats are connected with the guide rods through bolts, a plurality of linear bearings are arranged in a lower shell, the linear bearings correspond to the guide rods one to one and are in sliding fit with the guide rods, and the top ends of springs are connected with upper end spring seats in an upper shell in a matched mode. When the diaphragm is pressed downwards, the inclination probability of the diaphragm is greatly reduced through guiding of the guide rods and the linear bearings and cooperation of force in the vertical direction of the springs, so that the transverse force borne by the upper end sliding rod is reduced, the friction force generated when the upper end sliding rod slides is greatly reduced, and the diaphragm is prevented from being damaged. And the operation of the regulating valve is smoother.

Description

Technical Field

[0001] The utility model relates to the field of machinery, in particular to a vehicle regulating valve, in particular to a pneumatic regulating valve. Background Art

[0002] Pneumatic control valve uses compressed gas as power source and cylinder as actuator. It drives the valve with the help of valve positioner, converter, solenoid valve, position-holding valve, gas storage tank, gas filter and other accessories to achieve switch quantity or proportional regulation. It receives control signals from industrial automation control systems to adjust various process parameters such as flow, pressure, temperature, liquid level, etc. of pipeline media. Pneumatic control valve is simple to control, quick to respond, and inherently safe, and no additional explosion-proof measures are required.

[0003] In the prior art, in the pneumatic actuator of the pneumatic regulating valve, the diaphragm is supported only by the spring. During long-term use, the diaphragm is prone to be skewed, which causes the slide bar connected to the diaphragm to be subjected to lateral force, which increases the friction of the slide bar, makes the slide bar not smooth, and reduces the service life of the slide bar. Therefore, an improved technology is urgently needed to solve the above problems existing in the prior art. Utility Model Content

[0004] The utility model aims to provide a pneumatic regulating valve. When the diaphragm is pressed downward, the probability of the diaphragm tilting is greatly reduced through the guidance of the guide rod and the linear bearing, and through the cooperation of the vertical force of the spring, thereby reducing the lateral force on the upper end slide bar, greatly reducing the friction force when the upper end slide bar slides, making the regulating valve run more smoothly, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pneumatic regulating valve, including a pneumatic actuator, a support frame, a valve body and a piston mechanism;

[0006] The pneumatic actuator comprises a lower housing, an upper housing, a diaphragm, a linear bearing and a guide rod, the lower housing and the upper housing are connected by a flange, the edge of the diaphragm is clamped between the lower housing and the upper housing, a plurality of upper spring seats are arranged at the top end inside the upper housing, a lower spring seat is arranged on the upper surface of the diaphragm, the lower spring seat corresponds to the upper spring seat one by one, a spring is arranged between the lower spring seat and the upper spring seat, the lower spring seat is connected to the top end of the guide rod by a bolt, the guide rod is arranged on the lower surface of the diaphragm, a plurality of linear bearings are arranged at the lower end inside the lower housing, the guide rod corresponds to the linear bearing one by one and slidably cooperates with the linear bearing, and an upper sliding rod is connected to the middle position of the diaphragm;

[0007] The top of the support frame is connected to the lower surface of the lower shell, a guide sleeve is provided at the center of the upper part of the support frame, the upper end slide rod cooperates with the guide sleeve and is inserted into the guide sleeve, the lower part of the upper end slide rod is connected to the upper surface of the pointer, and the pointer is movably provided inside the support frame;

[0008] The top end of the valve body is connected to the bottom end of the support frame, an inlet flow channel and an outlet flow channel are arranged inside the valve body, and a valve seat is arranged inside the valve body between the inlet flow channel and the outlet flow channel;

[0009] The piston mechanism includes a valve stem and a valve core. The top end of the valve stem passes through the lower part of the support frame and is connected to the lower surface of the pointer. The bottom end of the valve stem is arranged in the valve body and is equipped with a valve core. The valve core is movably arranged in the valve body and cooperates with the valve seat.

[0010] Preferably, the utility model provides a pneumatic regulating valve, wherein the upper surface of the upper shell is provided with air inlet and outlet.

[0011] Preferably, the utility model provides a pneumatic regulating valve, wherein a lower pressure ring is arranged on the upper part of the upper end sliding rod, a limiting nut is arranged on the top of the upper end sliding rod, an upper pressure ring is arranged on the bottom of the limiting nut, and the upper pressure ring and the lower pressure ring are respectively pressed on the upper surface and the lower surface of the diaphragm.

[0012] Preferably, the utility model provides a pneumatic regulating valve, wherein the upper surface and the lower surface of the pointer are both provided with a first connecting sleeve, the bottom of the upper end sliding rod is plugged into the first connecting sleeve on the upper surface of the pointer and is fastened by bolts, and the top end of the valve stem is plugged into the first connecting sleeve on the lower surface of the pointer and is fastened by bolts.

[0013] Preferably, the utility model provides a pneumatic regulating valve, wherein a through hole is opened at the lower part of the support frame, a filler is arranged in the through hole, a threaded pressure ring is arranged at the upper part of the support frame located at the through hole, and the valve stem is inserted through the filler and the threaded pressure ring.

[0014] Preferably, the utility model provides a pneumatic regulating valve, wherein connecting flanges are respectively provided at both ends of the valve body.

[0015] Preferably, the utility model provides a pneumatic regulating valve, wherein a second connecting sleeve is provided on the upper surface of the valve core, and the bottom end of the valve stem is plugged into the second connecting sleeve and is fastened with bolts.

[0016] Preferably, the utility model provides a pneumatic regulating valve, wherein a scale indicator plate is provided on the inner side of the support frame and close to the side where the pointer points.

[0017] Preferably, the utility model provides a pneumatic regulating valve, wherein a support plate is provided at the top end of the guide rod, and the diaphragm is clamped between the support plate and the lower end spring seat at a corresponding position.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] The diaphragm is evenly provided with a number of lower spring seats and guide rods in a ring shape. The lower spring seat is connected to the guide rod by bolts. A number of linear bearings are provided inside the lower shell. The linear bearings correspond to the guide rods one by one and slide in cooperation with them. The top of the spring is connected with the upper spring seat inside the upper shell, so that the lower end of the spring is provided with a guide mechanism of the guide rod and the linear bearing. When the diaphragm is pressed downward, the probability of the diaphragm tilting is greatly reduced through the guidance of the guide rod and the linear bearing and the cooperation of the vertical force of the spring, thereby reducing the lateral force on the upper sliding rod, greatly reducing the friction when the upper sliding rod slides, and making the regulating valve run more smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the utility model;

[0021] Figure 2 It is a schematic diagram of the structure of the pneumatic actuator;

[0022] Figure 3 It is a schematic diagram of the connection structure between the lower end spring seat and the guide rod.

[0023] In the figure: lower shell 1, upper shell 2, diaphragm 3, linear bearing 4, guide rod 5, upper spring seat 6, lower spring seat 7, upper slide rod 8, support frame 9, guide sleeve 10, pointer 11, valve body 12, inlet flow channel 13, outlet flow channel 14, valve seat 15, valve stem 16, valve core 17, spring 18, air inlet and outlet 19, lower pressure ring 20, limit nut 21, upper pressure ring 22, first connecting sleeve 23, packing 24, threaded pressure ring 25, connecting flange 26, second connecting sleeve 27, scale indicator plate 28. DETAILED DESCRIPTION

[0024] The following will combine the embodiments and drawings of the utility model to clearly and completely describe the technical solution of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model;

[0025] It should be noted that, in the description of the present invention, the terms "inside", "outside", "upper", "lower", "both sides", "one end", "the other end", "left" and "right" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0026] See also Figure 1-3 , the utility model provides a technical solution: a pneumatic regulating valve, including a pneumatic actuator, a support frame 9, a valve body 12 and a piston mechanism;

[0027] The pneumatic actuator includes a lower housing 1, an upper housing 2, a diaphragm 3, a linear bearing 4 and a guide rod 5. The lower housing 1 and the upper housing 2 are connected by a flange. The edge of the diaphragm 3 is clamped between the lower housing 1 and the upper housing 2. A plurality of upper spring seats 6 are arranged at the top end of the upper housing 2. A lower spring seat 7 is arranged on the upper surface of the diaphragm 3. The lower spring seat 7 corresponds to the upper spring seat 6 one by one. A spring 18 is arranged between the lower spring seat 7 and the upper spring seat 6. The lower spring seat 7 is connected to the top end of the guide rod 5 by bolts. A support plate 29 is arranged at the top end of the guide rod 5. The corresponding position of the diaphragm 3 is clamped between the support plate 29 and the lower spring seat 7 to ensure the sealing of the diaphragm 3 at the guide rod 5. The guide rod 5 is arranged at the diaphragm 3. On the lower surface, a plurality of linear bearings 4 are arranged at the lower end of the lower shell 1, and the guide rods 5 correspond to the linear bearings 4 one by one and slide in cooperation, and an upper sliding rod 8 is connected to the middle position of the diaphragm 3, and a lower pressure ring 20 is arranged on the upper part of the upper sliding rod 8, and a limiting nut 21 is arranged at the top of the upper sliding rod 8, and an upper pressure ring 22 is arranged at the bottom of the limiting nut 21, and the upper pressure ring 22 and the lower pressure ring 20 are pressed on the upper surface and the lower surface of the diaphragm 3 respectively. This structure is adopted to realize the connection between the upper sliding rod 8 and the diaphragm 3, and at the same time ensure the sealing of the diaphragm 3 at the upper pressure ring 22 and the lower pressure ring 20, so that the diaphragm 3 drives the upper sliding rod 8 to rise and fall, and the upper surface of the upper shell 2 is provided with an air inlet and outlet 19 to realize the entry and discharge of gas;

[0028] The top of the support frame 9 is connected to the lower surface of the lower shell 1, and a guide sleeve 10 is arranged at the center of the upper part of the support frame 9. The upper end slide bar 8 cooperates with the guide sleeve 10 and is inserted into the guide sleeve 10. The lower part of the upper end slide bar 8 is connected to the upper surface of the pointer 11. The pointer 11 is movably arranged inside the support frame 9. A scale indicator plate 28 is arranged inside the support frame 9 and close to the side where the pointer 11 points to cooperate with the pointer 11, so as to judge the position of the valve core 17 from the outside, thereby realizing a rough judgment of the flow rate;

[0029] The top of the valve body 12 is connected to the bottom of the support frame 9. An inlet flow channel 13 and an outlet flow channel 14 are provided inside the valve body 12. A valve seat 15 is provided inside the valve body 12 between the inlet flow channel 13 and the outlet flow channel 14. Connecting flanges 26 are provided at both ends of the valve body 12 to achieve connection between the valve body 12 and the pipeline.

[0030] The piston mechanism includes a valve stem 16 and a valve core 17. The top end of the valve stem 16 passes through the lower part of the support frame 9 and is connected to the lower surface of the pointer 11. A through hole is opened at the lower part of the support frame 9. A packing 24 is arranged in the through hole. The support frame 9 is provided with a threaded pressing ring 25 at the upper part of the through hole. The valve stem 16 is penetrated by the packing 24 and the threaded pressing ring 25. The packing 24 is used to prevent the fluid in the valve body 12 from leaking from the support frame 9. The bottom end of the valve stem 16 is arranged in the valve body 12 and is installed with a valve core 17. The valve core 17 is movably arranged in the valve body 12 and cooperates with the valve seat 15. A second connecting sleeve 27 is provided on the upper surface of the valve core 17, and the bottom end of the valve stem 16 is plugged into the second connecting sleeve 27 and fastened by bolts to realize the connection and disassembly of the valve stem 16 and the valve core 17. A first connecting sleeve 23 is provided on the upper and lower surfaces of the pointer 11, and the bottom of the upper end sliding rod 8 is plugged into the first connecting sleeve 23 on the upper surface of the pointer 11 and fastened by bolts. The top end of the valve stem 16 is plugged into the first connecting sleeve 23 on the lower surface of the pointer 11 and fastened by bolts to realize the connection and disassembly of the pointer 11 with the upper end sliding rod 8 and the valve stem 16.

[0031] Installation method and use principle: The lower shell 1 is welded with the support frame 9, and then the linear bearing 4 is evenly installed in the lower part of the lower shell 1, and then the upper slide bar 8 passes through the guide sleeve 10 on the lower shell 1 and the upper part of the support frame 9. The lower spring seat 7 is connected to the top of the guide rod 5 by bolts. At this time, the lower spring seat 7 is located on the upper surface of the diaphragm 3, and the guide rod 5 is located on the lower surface of the diaphragm 3. At the same time, the top of the upper slide bar 8 passes through the center position of the diaphragm 3, and the lower pressure plate is pressed against the lower surface of the diaphragm 3, and then the limit nut 21 is threadedly connected with the top of the upper slide bar 8. At this time, the upper pressure plate is pressed on the upper surface of the diaphragm 3, and the bottom end of the spring is connected to the lower spring seat 7, and the top end of the spring is connected to the upper spring seat 6 inside the upper shell 2. The upper shell 2 is covered on the upper surface of the lower shell 1 and connected through the flange. At this time, the periphery of the diaphragm 3 cooperates with the bolts used to connect the upper shell 2 and the lower shell 1. Fill the packing 24 into the through hole at the bottom of the support frame 9, then thread the threaded pressing ring 25 on the top of the through hole, then pass the flange through the packing 24 and the threaded pressing ring 25 from bottom to top, and connect the top of the valve stem 16 to the first connecting sleeve 23 on the lower surface of the pointer 11, and finally connect the valve core 17 to the bottom of the valve stem 16 through the second connecting sleeve 27, and connect the valve body 12 to the bottom of the support frame 9 to complete the installation. When in use, the gas enters the air cavity above the diaphragm 3 from the inlet and outlet 19 of the upper shell 2, pressing the diaphragm 3 downward, so that the upper end slide bar 8, the pointer 11 and the valve stem 16 are pressed downward, so that the valve core 17 is pressed on the top of the valve seat 15, so that the regulating valve is closed, and the gas is extracted from the inlet and outlet 19 of the upper shell 2, and the diaphragm 3 rises, so that the valve core 17 leaves the valve seat 15, so that the regulating valve is opened. When the diaphragm 3 rises and falls, the guide rod 5 moves along the linear bearing 4 to ensure that the diaphragm 3 will not be skewed. The utility model has a reasonable structure. The diaphragm 3 is evenly provided with a plurality of lower spring seats 7 and guide rods 5 in an annular shape. The lower spring seat 7 is connected to the guide rod 5 by bolts. A plurality of linear bearings 4 are provided inside the lower shell 1. The linear bearings 4 correspond to the guide rods 5 one by one and slide together. The top of the spring is matched and connected with the upper spring seat 6 inside the upper shell 2, so that the lower end of the spring is provided with a guide mechanism of the guide rod 5 and the linear bearing 4. When the diaphragm 3 is pressed down, the probability of the diaphragm 3 being tilted is greatly reduced through the guidance of the guide rod 5 and the linear bearing 4 and through the cooperation of the vertical force of the spring, thereby reducing the lateral force on the upper slide bar 8, greatly reducing the friction force when the upper slide bar 8 slides, and making the regulating valve run more smoothly.

[0032] The details not described in the present invention are all known technologies to those skilled in the art.

[0033] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified and replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A pneumatic regulating valve, characterized in that: It comprises a pneumatic actuator, a support frame (9), a valve body (12) and a piston mechanism; The pneumatic actuator comprises a lower housing (1), an upper housing (2), a diaphragm (3), a linear bearing (4) and a guide rod (5); the lower housing (1) and the upper housing (2) are connected via a flange; the edge of the diaphragm (3) is clamped between the lower housing (1) and the upper housing (2); a plurality of upper spring seats (6) are arranged at the top end of the interior of the upper housing (2); a lower spring seat (7) is arranged on the upper surface of the diaphragm (3); the lower spring seat (7) is in contact with the upper spring seat (6); The spring seats (6) correspond one to one, a spring (18) is arranged between the lower spring seat (7) and the upper spring seat (6), the lower spring seat (7) is connected to the top of the guide rod (5) by a bolt, the guide rod (5) is arranged on the lower surface of the diaphragm (3), a plurality of linear bearings (4) are arranged at the lower end of the lower shell (1), the guide rod (5) corresponds one to one with the linear bearings (4) and is slidably matched, and the middle position of the diaphragm (3) is connected with the upper sliding rod (8); The top end of the support frame (9) is connected to the lower surface of the lower shell (1), a guide sleeve (10) is arranged at the center position of the upper part of the support frame (9), the upper end slide bar (8) cooperates with the guide sleeve (10) and is inserted into the guide sleeve (10), the lower part of the upper end slide bar (8) is connected to the upper surface of the pointer (11), and the pointer (11) is movably arranged on the inner side of the support frame (9); The top end of the valve body (12) is connected to the bottom end of the support frame (9), an inlet flow channel (13) and an outlet flow channel (14) are provided inside the valve body (12), and a valve seat (15) is provided inside the valve body (12) between the inlet flow channel (13) and the outlet flow channel (14); The piston mechanism comprises a valve stem (16) and a valve core (17); the top end of the valve stem (16) passes through the lower part of the support frame (9) and is connected to the lower surface of the pointer (11); the bottom end of the valve stem (16) is arranged in the valve body (12) and is installed with the valve core (17); the valve core (17) is movably arranged in the valve body (12) and cooperates with the valve seat (15).

2. A pneumatic regulating valve according to claim 1, characterized in that: The upper surface of the upper shell (2) is provided with air inlet and outlet ports (19).

3. The pneumatic regulating valve according to claim 1, characterized in that: A lower pressure ring (20) is arranged on the upper part of the upper end slide rod (8), a limiting nut (21) is arranged on the top of the upper end slide rod (8), an upper pressure ring (22) is arranged on the bottom of the limiting nut (21), and the upper pressure ring (22) and the lower pressure ring (20) are pressed on the upper surface and the lower surface of the diaphragm (3) respectively.

4. The pneumatic regulating valve according to claim 1, characterized in that: The upper surface and the lower surface of the pointer (11) are both provided with a first connecting sleeve (23); the bottom of the upper end sliding rod (8) is plugged into the first connecting sleeve (23) on the upper surface of the pointer (11) and is fastened by bolts; the top of the valve stem (16) is plugged into the first connecting sleeve (23) on the lower surface of the pointer (11) and is fastened by bolts.

5. The pneumatic regulating valve according to claim 1, characterized in that: A through hole is provided at the lower part of the support frame (9), a filler (24) is arranged in the through hole, a threaded pressing ring (25) is provided at the upper part of the support frame (9) located at the through hole, and the valve stem (16) is inserted through the filler (24) and the threaded pressing ring (25).

6. The pneumatic regulating valve according to claim 1, characterized in that: Connecting flanges (26) are respectively provided at both ends of the valve body (12).

7. The pneumatic regulating valve according to claim 1, characterized in that: A second connecting sleeve (27) is provided on the upper surface of the valve core (17), and the bottom end of the valve stem (16) is plugged into the second connecting sleeve (27) and is fastened with bolts.

8. The pneumatic regulating valve according to claim 1, characterized in that: A scale indicator plate (28) is arranged inside the support frame (9) and close to the side where the pointer (11) points.

9. The pneumatic regulating valve according to claim 1, characterized in that: A support plate (29) is provided at the top end of the guide rod (5), and the diaphragm (3) is clamped between the support plate (29) and the lower end spring seat (7) at a corresponding position.

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