Safety valve with overload protection function

Abstract

The utility model discloses a safety valve with an overload protection function, and relates to the technical field of valves. The valve comprises a valve body, a valve rod and a worm are rotationally arranged in the valve body, a butterfly plate and a worm gear are arranged on the valve rod, the worm gear is meshed with the worm, a single-chip microcomputer is arranged on the valve body, the valve body communicates with a fixing cylinder, the fixing cylinder communicates with a temporary storage box, a piston is arranged in the fixing cylinder in a sliding mode, and the piston is connected with the single-chip microcomputer. The fixed cylinder is provided with an air cylinder push rod, the movable end of the air cylinder push rod is connected with the piston, the butterfly plate is provided with a pressure sensor and a movable plate which are in abutting lap joint, a corrugated pipe and a reset spring are arranged between the movable plate and the butterfly plate, and a containing cavity is formed among the movable plate, the butterfly plate and the corrugated pipe. When the valve is used, the overload protection function can be achieved, the risk that the butterfly plate is deformed and damaged is reduced, the risk that the valve rod is broken is reduced, normal use is guaranteed, safety is improved, and therefore the valve is more practical.

Description

Technical Field

[0001] This application relates to the field of valve technology, specifically to a safety valve with overload protection. Background Technology

[0002] Valves are devices used in fluid systems to control the direction, pressure, and flow rate of fluids. Butterfly valves, also called flap valves, are simple regulating valves used for on / off control of low-pressure pipeline media. A butterfly valve mainly consists of a valve body, a valve stem, and a butterfly plate. Opening and closing are achieved by the valve stem rotating the butterfly plate. Most common butterfly valves are driven by a worm gear. The worm gear is manually rotated, and the worm gear rotates due to meshing, driving the valve stem. In existing technologies, if the butterfly plate is not fully closed (i.e., the opening / closing state is small), the pressure in the pipeline will increase. Forcibly closing the butterfly plate at this time can easily cause deformation and damage, and the valve stem is prone to breakage, affecting normal use and requiring improved safety. Therefore, a safety valve with overload protection is proposed. Utility Model Content

[0003] The purpose of this application is to address the technical problem that if the butterfly plate is not fully closed, i.e., the opening and closing state of the butterfly plate is small, the pressure in the pipeline will increase. If the butterfly plate is forcibly closed at this time, it is easy to cause deformation and damage to the butterfly plate, and the valve stem is easy to break, affecting normal use and requiring improved safety. This application provides a safety valve with overload protection.

[0004] To achieve the above objectives, this application specifically adopts the following technical solution:

[0005] A safety valve with overload protection includes a valve body. A valve stem and a worm gear are rotatably mounted inside the valve body. A butterfly plate and a worm wheel are mounted on the valve stem, with the worm wheel meshing with the worm gear. A microcontroller is mounted on the valve body. A fixed cylinder is connected to the valve body, and a temporary storage box is connected to the fixed cylinder. A piston is slidably mounted inside the fixed cylinder. A cylinder push rod with its movable end connected to the piston is mounted on the fixed cylinder. A pressure sensor and a movable plate are mounted on the butterfly plate, engaging in contact. A bellows and a return spring are positioned between the movable plate and the butterfly plate. A receiving cavity is formed between the movable plate, the butterfly plate, and the bellows. The pressure sensor and the return spring are both located within the receiving cavity. The pressure sensor and the cylinder push rod are both electrically connected to the microcontroller.

[0006] Furthermore, a limiting ring plate is provided inside the fixed cylinder, and a guide cone surface is constructed on the limiting ring plate. A sealing block with a cone shape is provided on the piston, which abuts and overlaps with the guide cone surface.

[0007] Furthermore, an air inlet pipe is connected between the temporary storage box and the valve body, and a control valve is installed on the air inlet pipe.

[0008] Furthermore, the temporary storage box is equipped with a delivery pump, the input end of which is connected to the temporary storage box and the output end of which is connected to the valve body.

[0009] Furthermore, a limit strip is provided inside the valve body, and the butterfly plate abuts and overlaps with the limit strip.

[0010] Furthermore, the butterfly plate is provided with a countersunk hole, and a guide rod connected to the movable plate is slidably disposed in the countersunk hole, with a return spring sleeved on the guide rod.

[0011] Furthermore, a collar is provided on the worm gear, a positioning post is provided on the collar, a positioning plate is slidably provided in the valve body and a compression spring is provided between the two, a plurality of positioning holes are provided on the positioning plate, the positioning plate abuts and overlaps with the collar, and the positioning post is inserted and engaged with the positioning hole.

[0012] Furthermore, a locking rod is slidably disposed on the valve body and a tension spring is disposed between the two, and a wedge-shaped block is disposed on the locking rod to abut against and overlap with the positioning plate.

[0013] The beneficial effects of this application are as follows: When in use, this application can realize overload protection function, reduce the risk of butterfly plate deformation and damage, reduce the risk of valve stem breakage, ensure normal use, improve safety, and therefore is more practical. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural view of this application;

[0015] Figure 2 This is a three-dimensional sectional view of this application;

[0016] Figure 3 This application Figure 2 Enlarged view of point A in the middle;

[0017] Figure 4 This application Figure 2 Enlarged view of point B in the middle;

[0018] Figure 5 This application Figure 2 Enlarged view of point C in the middle;

[0019] Figure 6 This is a three-dimensional sectional view from another perspective of this application;

[0020] Figure 7 This application Figure 6 Enlarged view of point D in the middle.

[0021] Reference numerals: 1. Valve body; 2. Valve stem; 3. Worm gear; 4. Butterfly plate; 5. Worm wheel; 6. Microcontroller; 7. Fixed cylinder; 8. Temporary storage box; 9. Piston; 10. Cylinder push rod; 11. Pressure sensor; 12. Movable plate; 13. Bellows; 14. Return spring; 15. Receiving cavity; 16. Limiting ring plate; 17. Guide cone surface; 18. Sealing block; 19. Inlet pipe; 20. Control valve; 21. Delivery pump; 22. Limiting strip; 23. Countersunk hole; 24. Guide rod; 25. Collar; 26. Positioning pin; 27. Positioning plate; 28. Compression spring; 29. ​​Positioning hole; 30. Locking rod; 31. Tension spring; 32. Wedge block. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0023] like Figures 1-7 As shown in one embodiment of this application, a safety valve with overload protection includes a valve body 1, which is vertical. A valve stem 2 and a worm gear 3 are rotatably disposed within the valve body 1. Both the valve stem 2 and the worm gear 3 are horizontal and vertically distributed. A butterfly plate 4 and a worm wheel 5 are disposed on the valve stem 2, both fixed to the valve stem 2. The worm wheel 5 is vertical and meshes with the worm gear 3. A microcontroller 6 is disposed on the valve body 1 and fixed to it. A fixed cylinder 7 is connected to the valve body 1, and a temporary storage box 8 is connected to the fixed cylinder 7. A piston 9 is slidably disposed within the fixed cylinder 7, sliding horizontally. A cylinder push rod 10, with its movable end connected to the piston 9, is disposed on the fixed cylinder 7. The cylinder push rod 10 is horizontal and fixed to the fixed cylinder 7. A pressure sensor 11 and a movable plate 12 are disposed on the butterfly plate 4, engaging in contact. The pressure sensor 11 and the movable plate 12 are located on the butterfly plate. On the same side of 4, pressure sensor 11 is fixed on butterfly plate 4. A bellows 13 and a return spring 14 are provided between movable plate 12 and butterfly plate 4. The two ends of bellows 13 are fixedly connected to movable plate 12 and butterfly plate 4 respectively. The two ends of return spring 14 are fixedly connected to movable plate 12 and butterfly plate 4 respectively. A receiving cavity 15 is formed between movable plate 12, butterfly plate 4 and bellows 13. Pressure sensor 11 and return spring 14 are both located in receiving cavity 15. Pressure sensor 11 and cylinder push rod 10 are both electrically connected to microcontroller 6. The input end of microcontroller 6 is electrically connected to external power supply and output end of pressure sensor 11. The input end of cylinder push rod 10 is electrically connected to output end of microcontroller 6. In this embodiment, the model of microcontroller 6 is PIC12F615-I / SNSOP8, the model of pressure sensor 11 is MPX5700 series, and the model of cylinder push rod 10 is SMC CDQ2 series.

[0024] In the initial state, the butterfly plate 4 is horizontal and closed, the piston 9 is in the initial position and blocks the connection between the fixed cylinder 7 and the valve body 1, the movable end of the cylinder push rod 10 extends, the movable plate 12 is away from the pressure sensor 11, and the bellows 13 and the return spring 14 are in their natural state. During use, if the butterfly plate 4 is not fully closed (i.e., the opening and closing state of the butterfly plate 4 is small), the pressure in the pipeline will increase. At this time, the movable plate 12 will contact and apply pressure to the pressure sensor 11, and the return spring 14 and the bellows 13 will be compressed. The pressure is measured by the pressure sensor 11. When the pressure value is large, the pressure sensor 11 transmits a signal to the microcontroller 6, which controls the movable end of the cylinder push rod 10 to retract, driving the piston 9... When the valve reaches its limit position, the fluid first enters the fixed cylinder 7 from the valve body 1, and then enters the temporary storage tank 8 from the fixed cylinder 7 for temporary storage, thereby reducing the pressure in the pipeline and achieving a pressure relief effect, reducing the pressure on the butterfly plate 4. Then, by driving the worm gear 3 to rotate, the worm wheel 5 rotates due to meshing and drives the valve stem 2 and the butterfly plate 4 to rotate together until the butterfly plate 4 is completely closed. At this time, the pressure value is relatively small. The pressure sensor 11 transmits the signal to the microcontroller 6, and the microcontroller 6 controls the movable end of the cylinder push rod 10 to extend, driving the piston 9 to move to the initial position. The piston 9 re-seals the connection between the fixed cylinder 7 and the valve body 1, and the bellows 13 and the return spring 14 are both reset to a near-natural state. When the butterfly plate 4 opens again, the fluid in the temporary storage tank 8 can be introduced into the valve body 1.

[0025] In summary, this application can achieve overload protection function during use, reduce the risk of deformation and damage to the butterfly plate 4, reduce the risk of breakage of the valve stem 2, ensure normal use, and improve safety, thus making it more practical.

[0026] like Figure 4 As shown, in some embodiments, a limiting ring plate 16 is provided inside the fixed cylinder 7. The limiting ring plate 16 is vertical and located at the connection between the fixed cylinder 7 and the valve body 1. A guide cone surface 17 is constructed on the limiting ring plate 16. A sealing block 18 with a cone shape is provided on the piston 9, which abuts against and overlaps with the guide cone surface 17. The sealing block 18 is fixed on the piston 9.

[0027] Referring to the above, in the initial state, the piston 9 is located in the initial position and close to the limiting ring plate 16. The sealing block 18 deforms and abuts against the guide cone surface 17 to improve the sealing performance. When the piston 9 slides to the limit position, it will move away from the limiting ring plate 16 and drive the sealing block 18 to move away from the guide cone surface 17. The sealing block 18 returns to a more natural state.

[0028] like Figure 5 As shown, in some embodiments, an air inlet pipe 19 is connected between the temporary storage box 8 and the valve body 1, and a control valve 20 is provided on the air inlet pipe 19. The control valve 20 is fixed on the air inlet pipe 19.

[0029] Referring to the above, in the initial state, the control valve 20 is in the closed state. If the fluid being transported is gas, when the butterfly plate 4 is opened next time, by opening the control valve 20, the gas fluid in the temporary storage tank 8 will enter the valve body 1 through the air inlet pipe 19, thereby guiding the fluid in the temporary storage tank 8 into the valve body 1, and then the control valve 20 can be closed.

[0030] like Figure 2 As shown, in some embodiments, a delivery pump 21 is provided on the temporary storage box 8. The delivery pump 21 is fixed on the temporary storage box 8, and the input end of the delivery pump 21 is connected to the temporary storage box 8, and the output end is connected to the valve body 1.

[0031] Referring to the above, if the fluid being transported is liquid, when the butterfly plate 4 is opened again, the liquid fluid in the temporary storage tank 8 will be transported to the valve body 1 by operating the transfer pump 21, and then the transfer pump 21 will be turned off.

[0032] like Figure 3 As shown, in some embodiments, a limit strip 22 is provided inside the valve body 1. The limit strip 22 is horizontal and fixed inside the valve body 1. The butterfly plate 4 abuts against the limit strip 22. The side of the butterfly plate 4 away from the pressure sensor 11 abuts against the limit strip 22.

[0033] Referring to the above, when the butterfly plate 4 is in the closed state, it will abut against and overlap with the limit strip 22. The limit strip 22 plays a positioning role, realizing the quick confirmation of the closed state of the butterfly plate 4, making it more convenient to use.

[0034] like Figure 3 As shown, in some embodiments, the butterfly plate 4 is provided with a countersunk hole 23, and a guide rod 24 connected to the movable plate 12 is slidably disposed in the countersunk hole 23. The guide rod 24 is fixedly connected to the movable plate 12, and a reset spring 14 is sleeved on the guide rod 24.

[0035] Referring to the above, when the movable plate 12 moves, it will drive the guide rod 24 to slide in the countersunk hole 23. Through the cooperation of the guide rod 24 and the countersunk hole 23, the movable plate 12 is guided and limited, improving the stability of use. When the return spring 14 is squeezed, it is limited by the guide rod 24 to prevent the return spring 14 from shifting position.

[0036] like Figure 7As shown, in some embodiments, a collar 25 is provided on the worm gear 3. The collar 25 is vertical and fixed on the worm gear 3. A positioning post 26 is provided on the collar 25. The positioning post 26 is horizontal and fixed on the collar 25. A positioning plate 27 is slidably provided inside the valve body 1, and a compression spring 28 is provided between the two. The positioning plate 27 slides in the horizontal direction. The compression spring 28 is horizontal and its two ends are fixedly connected to the valve body 1 and the positioning plate 27 respectively. A plurality of positioning holes 29 are provided on the positioning plate 27. The plurality of positioning holes 29 are all horizontal and distributed in a ring array. The positioning plate 27 and the collar 25 abut against each other and the positioning post 26 is inserted into the positioning hole 29.

[0037] Referring to the above, in the initial state, the positioning plate 27 is in its initial position and abuts against the collar 25, the compression spring 28 is in its natural state, and the positioning pin 26 is inserted into one of the positioning holes 29. At this time, the worm gear 3 cannot rotate, thus locking the worm gear 3. In use, the positioning plate 27 is driven to slide to its limit position and away from the collar 25. The compression spring 28 is compressed, the positioning pin 26 exits the positioning hole 29, and the worm gear 3 can rotate. Afterward, the positioning plate 27 is released, the compression spring 28 returns to its natural state, the positioning plate 27 slides to its initial position and abuts against the collar 25 again, and the positioning pin 26 is inserted into one of the positioning holes 29. This locks the worm gear 3 when the butterfly plate 4 is not fully closed, preventing the butterfly plate 4 from being forcibly closed manually and further improving the safety of use.

[0038] like Figure 7 As shown, in some embodiments, a locking rod 30 is slidably disposed on the valve body 1 and a tension spring 31 is disposed between the two. The locking rod 30 slides in the vertical direction, and the tension spring 31 is in the vertical direction with its two ends fixedly connected to the valve body 1 and the locking rod 30 respectively. A wedge block 32 is disposed on the locking rod 30 that abuts against and overlaps with the positioning plate 27. The wedge block 32 is fixedly disposed on the locking rod 30.

[0039] Referring to the above, in the initial state, the tension spring 31 is in its natural state, and both the locking rod 30 and the wedge block 32 are in their initial positions. When the positioning plate 27 slides to its limit position, it will first abut against the inclined surface of the wedge block 32, forcing the locking rod 30 and the wedge block 32 to move upward together to the limit position, and the tension spring 31 will be stretched. After that, the tension spring 31 will return to its natural state, and the locking rod 30 and the wedge block 32 will move downward together to the initial position, and the positioning plate 27 will abut against the plane of the wedge block 32 to lock the positioning plate 27, making it easier to rotate the worm gear 3. Conversely, the locking rod 30 and the wedge block 32 will move upward together to the limit position, and the tension spring 31 will be stretched, thereby unlocking the positioning plate 27. After that, the locking rod 30 or the wedge block 32 will be released, and the locking rod 30 and the wedge block 32 will move downward together to the initial position, and the tension spring 31 will return to its natural state.

[0040] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A safety valve with overload protection, comprising a valve body (1), wherein a valve stem (2) and a worm gear (3) are rotatably disposed within the valve body (1), and a butterfly plate (4) and a worm wheel (5) are disposed on the valve stem (2), the worm wheel (5) meshing with the worm gear (3), characterized in that, A microcontroller (6) is installed on the valve body (1). A fixed cylinder (7) is connected to the valve body (1). A temporary storage box (8) is connected to the fixed cylinder (7). A piston (9) is slidably installed inside the fixed cylinder (7). A cylinder push rod (10) with its movable end connected to the piston (9) is installed on the fixed cylinder (7). A pressure sensor (11) and a movable plate (12) are installed on the butterfly plate (4). A bellows (13) and a return spring (14) are installed between the movable plate (12) and the butterfly plate (4). A receiving cavity (15) is formed between the movable plate (12), the butterfly plate (4), and the bellows (13). The pressure sensor (11) and the return spring (14) are both located in the receiving cavity (15). The pressure sensor (11) and the cylinder push rod (10) are both electrically connected to the microcontroller (6).

2. The safety valve with overload protection according to claim 1, characterized in that, The fixed cylinder (7) is provided with a limiting ring plate (16), the limiting ring plate (16) is provided with a guide cone surface (17), and the piston (9) is provided with a sealing block (18) that abuts against and overlaps with the guide cone surface (17) and is constructed in a cone shape.

3. The safety valve with overload protection according to claim 1, characterized in that, An air inlet pipe (19) is connected between the temporary storage box (8) and the valve body (1), and a control valve (20) is provided on the air inlet pipe (19).

4. The safety valve with overload protection according to claim 1, characterized in that, The temporary storage box (8) is equipped with a delivery pump (21), the input end of which is connected to the temporary storage box (8) and the output end is connected to the valve body (1).

5. The safety valve with overload protection according to claim 1, characterized in that, The valve body (1) is provided with a limit strip (22), and the butterfly plate (4) abuts and overlaps with the limit strip (22).

6. The safety valve with overload protection according to claim 1, characterized in that, The butterfly plate (4) has a countersunk hole (23), and a guide rod (24) connected to the movable plate (12) is slidably disposed in the countersunk hole (23). A reset spring (14) is sleeved on the guide rod (24).

7. The safety valve with overload protection according to claim 1, characterized in that, A collar (25) is provided on the worm gear (3), and a positioning post (26) is provided on the collar (25). A positioning plate (27) is slidably provided inside the valve body (1), and a compression spring (28) is provided between the two. Multiple positioning holes (29) are provided on the positioning plate (27). The positioning plate (27) and the collar (25) abut against each other, and the positioning post (26) is inserted into the positioning hole (29).

8. The safety valve with overload protection according to claim 7, characterized in that, A locking rod (30) is slidably disposed on the valve body (1) and a tension spring (31) is disposed between the two. A wedge block (32) is disposed on the locking rod (30) to abut against and overlap with the positioning plate (27).

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