Butterfly valve

Abstract

The present application provides a butterfly valve which is not easy to be opened or closed by irrelevant people, comprising a valve body, a valve shaft vertically arranged in the center of the valve body, a butterfly plate arranged on the valve shaft, a valve seat arranged in the valve body for sealing with the butterfly plate, a protective shell arranged on the valve body, a worm arranged rotatably in the protective shell and one end of the worm located outside the protective shell, the valve shaft passing through the valve body and located in the protective shell, a worm wheel fixedly arranged on the valve shaft and matched with the worm, and an encryption device arranged between the valve shaft and the protective shell body for preventing irrelevant people from rotating the worm, the encryption device comprising a chuck arranged on the valve shaft, a clamping jaw arranged rotatably in the protective shell by a rotating device and matched with the chuck, and a control device arranged on the protective shell for controlling the rotation of the clamping jaw by a worker.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to a butterfly valve. Background Technology

[0002] A butterfly valve is a simple regulating valve that can be used for the on / off control of low-pressure pipeline media. A butterfly valve is a type of valve whose closing element is a disc that rotates around the valve shaft to achieve opening and closing. The valve can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metals and radioactive media. It mainly plays a role in shut-off and throttling in pipelines.

[0003] Currently, butterfly valves are being used more and more widely in pipeline connections, and their application is becoming increasingly widespread. This makes it inconvenient to arrange a large number of people to closely manage them for extended periods. Instead, people can only access them when they are in use. Furthermore, due to continuous improvements in butterfly valves, they have become increasingly easy to open. This also means that in crowded areas, butterfly valves can be accidentally opened or closed by unauthorized personnel, resulting in water waste or pipeline malfunctions, thus wasting social resources. Summary of the Invention

[0004] Therefore, in view of the above problems, the present invention proposes a butterfly valve that is not easily opened or closed by unauthorized persons.

[0005] To achieve the above objectives, the technical solution of the present invention provides a butterfly valve, comprising a valve body, a valve shaft vertically disposed at the center of the valve body, a butterfly plate disposed on the valve shaft, a valve seat disposed within the valve body for sealing with the butterfly plate, and a protective shell disposed on the valve body. A worm gear is rotatably disposed within the protective shell, with one end of the worm gear located outside the protective shell. The valve shaft extends out of the valve body and is located within the protective shell. A worm wheel cooperating with the worm gear is fixedly disposed on the valve shaft. An encryption device for preventing unauthorized personnel from rotating the worm gear is disposed between the valve shaft and the protective shell. The encryption device includes a chuck disposed on the valve shaft and a chuck claw rotatably disposed within the protective shell via a rotating device for engaging with the chuck. The protective shell is also provided with a control device for allowing operators to control the rotation of the chuck claw.

[0006] A further improvement is that the rotating device includes: first bearings respectively disposed on the left and right sides inside the protective shell, a rotating rod disposed on the first bearings, and a pawl disposed on the rotating rod.

[0007] A further improvement is that the control device includes: a long gear fixedly mounted on the rotating rod, and a short gear mounted inside the protective shell via a pressure-sensitive device to drive the long gear to rotate in both directions.

[0008] A further improvement is made to the encryption pressing device, which includes: a sleeve disposed within the protective shell via a guide and reset device; a push rod disposed on the protective shell via a sliding device that can slide back and forth; and a front-to-back rotating device disposed between the sleeve and the protective shell for causing the sleeve to rotate when the user presses the sleeve. A second bearing is disposed within the sleeve, and one end of the push rod located within the protective shell is connected to the second bearing so that the sleeve can rotate when the push rod pushes the sleeve. A short gear is disposed on the sleeve.

[0009] A further improvement is that the guide reset device includes: a guide rod disposed inside the protective shell on the side of the rotating rod away from the chuck, parallel to the rotating rod, and the size of the guide rod matching the inner diameter of the sleeve; the sleeve is sleeved on the guide rod; and a spring is also sleeved on the guide rod, with one end of the spring resisting the protective shell and the other end resisting the end of the sleeve near the guide rod.

[0010] A further improvement is that the sliding device includes: a slide cylinder fixedly mounted on the protective shell, a sliding channel extending through the slide cylinder and the protective shell, an anti-rotation block disposed within the sliding channel, and a push rod passing through the sliding channel with an anti-rotation groove matching the anti-rotation block.

[0011] A further improvement is that the front and rear rotating device includes: two rotating grooves formed on the sleeve and arranged in opposite directions, and two ring blocks set on the top of the protective shell by a magnetic attraction and repulsion device to cooperate with the two rotating grooves on the sleeve.

[0012] A further improvement is that the magnetic attraction and repulsion device includes: a strong magnetic block disposed at the bottom of the ring block for adsorbing onto the protective shell or for pressing the ring block against the rotating groove when repelled by an external strong magnetic block; and a movable limiting post disposed on the protective shell to prevent the ring block from shifting when it is under force. The lowest point of the movable limiting post is higher than the height of the sleeve, and the lowest point of the pressing block is higher than the height of the sleeve when the strong magnetic block is adsorbed onto the protective shell.

[0013] A further improvement is that the rotating groove includes: at least one first inclined groove formed on the sleeve and arranged along the sleeve axial direction, and at least one second inclined groove inclinedly formed on the sleeve. One end of the lowest point of the second inclined groove is connected to one end of the highest point of the first inclined groove and has a height difference so that when the sleeve moves to the point where the ring block is located at the highest point of the first inclined groove, the ring block can fall into the second inclined groove, thereby allowing the sleeve to move along the trajectory of the second inclined groove. One end of the highest point of the second inclined groove is connected to one end of the lowest point of the first inclined groove and has a height difference so that when the sleeve moves to the point where the ring block is located at the highest point of the second inclined groove, the ring block can fall into the first inclined groove, thereby allowing the sleeve to move along the trajectory of the first inclined groove.

[0014] The advantages and beneficial effects of this invention are as follows:

[0015] With a simple structure, it is equipped with a protective shell to enclose and protect the main opening and closing components. An encryption device is installed between the protective shell and the valve shaft. The valve can only be opened or closed after the operator follows the relevant procedures. Unauthorized personnel can only see the push rod, worm gear and protective shell and cannot know its internal structure. Simple operation of these three parts will not open or close the valve, reducing the risk of accidental valve opening and closing and reducing the waste of social resources. Attached Figure Description

[0016] Figure 1 This is a front view schematic diagram of a butterfly valve according to the present invention;

[0017] Figure 2 This is a top sectional view of a butterfly valve according to the present invention;

[0018] Figure 3 This is a top view schematic diagram of a butterfly valve according to the present invention;

[0019] Figure 4 This is a schematic diagram of the contact state of the butterfly valve sleeve and the ring block according to the present invention;

[0020] Figure 5 This is a schematic diagram of the butterfly valve sleeve and ring block in a non-contact state according to the present invention;

[0021] Figure 6 This is a magnified cross-sectional view of part A of a butterfly valve according to the present invention;

[0022] In the diagram: 1. Valve body; 2. Valve shaft; 3. Butterfly plate; 4. Valve seat; 5. Protective shell; 6. Worm gear; 7. Worm wheel; 8. Chuck; 9. Claw; 10. First bearing; 11. Rotating rod; 12. Long gear; 13. Short gear; 14. Sleeve; 15. Push rod; 16. Second bearing; 17. Guide rod; 18. Spring; 19. Slide cylinder; 20. Sliding channel; 21. Anti-rotation block; 22. Anti-rotation groove; 23. Ring block; 24. Strong magnetic block; 25. Moving limit post; 26. Marking point; 27. First inclined groove; 28. Second inclined groove; 29. ​​Handwheel; 30. Pressing block. Detailed Implementation

[0023] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0024] like Figures 1-6As shown, the technical solution of the present invention provides a butterfly valve, including a valve body 1, a valve shaft 2 vertically disposed at the center inside the valve body 1, a butterfly plate 3 disposed on the valve shaft 2, a valve seat 4 disposed inside the valve body 1 for sealing with the butterfly plate 3, and a protective shell 5 disposed on the valve body 1. A worm gear 6 is rotatably disposed inside the protective shell 5, with one end of the worm gear 6 located outside the protective shell 5. The valve shaft 2 extends out of the valve body 1 and is located inside the protective shell 5. A worm wheel 7 that cooperates with the worm gear 6 is fixedly disposed on the valve shaft 2. An encryption device for preventing unauthorized personnel from rotating the worm gear 6 is provided between the valve shaft 2 and the protective shell 5. The encryption device includes a chuck 8 disposed on the valve shaft 2 and a chuck 9 rotatably disposed inside the protective shell 5 for engaging with the chuck 8 via a rotating device. The protective shell 5 is also provided with a control device for allowing the operator to control the rotation of the chuck 9.

[0025] In order to enable the chuck 9 to rotate smoothly, the rotating device includes: first bearings 10 respectively disposed on the left and right sides inside the protective shell 5, and a rotating rod 11 disposed on the first bearings 10, wherein the rotating rod 11 is provided with the chuck 9.

[0026] To facilitate external control of the rotating rod 11 by the operator, the control device includes: a long gear 12 fixedly mounted on the rotating rod 11, and a short gear 13 mounted inside the protective shell 5 via a press device to drive the long gear 12 to rotate in both directions. The pawl 9 can be mounted on the long gear 12.

[0027] To prevent unauthorized personnel from rotating the rotating rod 11 and the worm gear 6, the encryption pressing device includes: a sleeve 14 disposed within the protective shell 5 via a guide and reset device; a push rod 15 disposed on the protective shell 5 via a sliding device; and a front-to-back rotating device disposed between the sleeve 14 and the protective shell 5 for causing the sleeve 14 to rotate when the user presses it. A second bearing 16 is disposed inside the sleeve 14, and one end of the push rod 15 located inside the protective shell 5 is connected to the second bearing 16 so that the sleeve 14 can rotate when the push rod 15 pushes it. A short gear 13 is disposed on the sleeve 14.

[0028] In order to ensure that the sleeve 14 is pressed, the guide reset device includes: a guide rod 17 disposed inside the protective shell 5 on the side of the rotating rod 11 away from the chuck 8 and parallel to the rotating rod 11, and the size of the guide rod 17 matches the inner diameter of the sleeve 14; the sleeve 14 is sleeved on the guide rod 17; a spring 18 is also sleeved on the guide rod 17, with one end of the spring 18 resisting the protective shell 5 and the other end resisting the end of the sleeve 14 near the guide rod 17.

[0029] In order to prevent the push rod 15 from being rotated by unauthorized personnel and to allow it to slide back and forth, the sliding device includes: a slide cylinder 19 fixedly installed on the protective shell 5, a sliding channel 20 extending through the slide cylinder 19 and the protective shell 5, and an anti-rotation block 21 installed in the sliding channel 20. The push rod 15 passes through the sliding channel 20 and is also provided with an anti-rotation groove 22 that matches the anti-rotation block 21.

[0030] In order to enable the sleeve 14 to rotate forward and backward, thereby driving the chuck 9 to disengage and re-engage, the front and rear rotation device includes: two rotation grooves opened on the sleeve 14 and arranged in opposite directions, and two ring blocks 23 set on the top of the protective shell 5 by magnetic attraction and repulsion devices to cooperate with the two rotation grooves on the sleeve 14.

[0031] To prevent the sleeve 14 from rotating when an external person presses the push rod 15, and to ensure that only the operator can control the movement of the ring block 23, the magnetic repulsion device includes: a strong magnetic block 24 located at the bottom of the ring block 23 for adsorbing onto the protective shell 5 or for pressing the ring block 23 against the rotating groove when repelled by an external strong magnetic block 24; and a movable limiting post 25 located on the protective shell 5 to prevent the ring block 23 from shifting under force. The lowest point of the movable limiting post 25 is higher than the height of the sleeve 14, and the lowest point of the pressing block when the strong magnetic block 24 is adsorbed onto the protective shell 5 is higher than the height of the sleeve 14. The outer shell can be provided with a marking point 26 to facilitate finding the position of the ring block 23, allowing the operator to place another strong magnetic block 24 that repels the strong magnetic block 24, thereby pushing the ring block 23 into the rotating groove. Alternatively, the marking point 26 can be omitted, and the position can be found using the relevant documentation of the butterfly valve, thus improving safety.

[0032] To enable the sleeve 14 to rotate along a trajectory when subjected to forces in the front-rear direction and obstructed by the ring block 23, the rotation groove includes: at least one first inclined groove 27 formed on the sleeve 14 and arranged along the axial direction of the sleeve 14, and at least one second inclined groove 28 inclinedly formed on the sleeve 14. One end of the lowest point of the second inclined groove 28 is connected to one end of the highest point of the first inclined groove 27 and has a height difference so that when the sleeve 14 moves to the point where the ring block 23 is located at the highest point of the first inclined groove 27, the ring block 23 can fall into the second inclined groove 28, thereby allowing the sleeve 14 to move along the trajectory of the second inclined groove 28. One end of the highest point of the second inclined groove 28 is connected to one end of the lowest point of the first inclined groove 27 and has a height difference so that when the sleeve 14 moves to the point where the ring block 23 is located at the highest point of the second inclined groove 28, the ring block can fall into the first inclined groove 27, thereby allowing the sleeve 14 to move along the trajectory of the first inclined groove 27. The ring blocks are initially located directly above the lowest point of the first inclined groove.

[0033] To enhance convenience, a handwheel 29 can be detachably installed on the worm gear to facilitate rotation of the worm gear. The push rod is located outside the protective shell and is also provided with a pressing block 30 to prevent the push rod from penetrating the protective shell and to facilitate the user to press the push rod.

[0034] Working principle: In use, place another magnetic block that is magnetically repelled by the strong magnetic block 24 on the card block on the protective shell 5. This causes the card block to fall into the lowest point of the first inclined groove 27 due to the repulsive force. At this time, while keeping the magnetic block in contact with the protective shell 5, the user pushes the push rod 15, which moves the sleeve 14 backward, causing the ring block 23 to fall from the first inclined groove 27 into the second inclined groove 28. At this time, the user releases the spring 18, which releases its elastic force to push the sleeve 14 to move. Since the ring block 23 is located in the second inclined groove 28, the sleeve 14 can only move along the trajectory of the second inclined groove 28, thus rotating and sliding at the same time, driving the short gear 13 to rotate, which in turn drives the long gear 12 to rotate. Then, the user presses the push rod repeatedly to gradually drive the rotating rod 11 to rotate and release the engagement between the pawl 9 and the chuck 8. Then, the reverse magnetic block re-attracts the strong magnetic block 24 back to the protective shell 5. At this time, the user can rotate the worm gear 6.

[0035] After use, the user places the magnetic block in the position of another ring block 23 and repeats the above steps to reassemble the card claw 9 and the card plate 8 to complete the encryption.

[0036] When the magnetic block is not used to press the ring block into the rotating groove, pushing the push rod by an unauthorized person will only cause the push rod and the sleeve to slide back and forth, without releasing the engagement between the chuck and the chuck.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions above are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. A butterfly valve, comprising a valve body, a valve shaft vertically disposed at the center of the valve body, a butterfly plate disposed on the valve shaft, a valve seat disposed within the valve body for sealing with the butterfly plate, and a protective shell disposed on the valve body, wherein a worm gear is rotatably disposed within the protective shell with one end of the worm gear located outside the protective shell, the valve shaft extends out of the valve body and is located within the protective shell, a worm wheel cooperating with the worm gear is fixedly disposed on the valve shaft, and a security device for preventing unauthorized personnel from rotating the worm gear is provided between the valve shaft and the protective shell, characterized in that: The encryption device includes: a chuck disposed on the valve shaft, and a chuck claw rotatably disposed inside the protective shell via a rotating device for engaging with the chuck. The protective shell is also provided with a control device for the operator to control the rotation of the chuck claw. The rotating device includes: first bearings respectively disposed on the left and right sides inside the protective shell, and a rotating rod disposed on the first bearings, wherein the rotating rod is provided with a pawl; The control device includes: a long gear fixedly mounted on the rotating rod, and a short gear mounted inside the protective shell via a pressure-sensitive device for driving the long gear to rotate in both directions; The encrypted pressing device includes: a sleeve disposed within the protective shell via a guide and reset device; a push rod disposed on the protective shell via a sliding device that can slide back and forth; and a front-to-back rotating device disposed between the sleeve and the protective shell for causing the sleeve to rotate when the user presses the sleeve. A second bearing is disposed within the sleeve, and one end of the push rod located within the protective shell is connected to the second bearing so that the sleeve can rotate when the push rod pushes the sleeve. A short gear is disposed on the sleeve.

2. A butterfly valve according to claim 1, characterized in that: The guide reset device includes: a guide rod disposed inside the protective shell on the side of the rotating rod away from the chuck, parallel to the rotating rod, and the size of the guide rod matching the inner diameter of the sleeve; the sleeve is sleeved on the guide rod; a spring is also sleeved on the guide rod, with one end of the spring resisting the protective shell and the other end resisting the end of the sleeve near the guide rod.

3. A butterfly valve according to claim 1, characterized in that: The sliding device includes: a slide cylinder fixedly mounted on the protective shell, a sliding channel extending through the slide cylinder and the protective shell, an anti-rotation block disposed within the sliding channel, and a push rod passing through the sliding channel with an anti-rotation groove matching the anti-rotation block.

4. A butterfly valve according to claim 1, characterized in that: The front and rear rotation device includes: two rotation grooves formed on the sleeve and arranged in opposite directions, and two ring blocks set on the top of the protective shell by magnetic attraction and repulsion devices to cooperate with the two rotation grooves on the sleeve.

5. A butterfly valve according to claim 4, characterized in that: The magnetic attraction and repulsion device includes: a strong magnetic block disposed at the bottom of the ring block for adsorbing onto the protective shell or for pressing the ring block against the rotating groove when repelled by an external strong magnetic block; and a movable limiting post disposed on the protective shell for preventing the ring block from shifting when it is subjected to force. The lowest point of the movable limiting post is higher than the height of the sleeve, and the lowest point of the pressing block is higher than the height of the sleeve when the strong magnetic block is adsorbed onto the protective shell.

6. A butterfly valve according to claim 4, characterized in that: The rotating groove includes: at least one first inclined groove formed on the sleeve and arranged along the axial direction of the sleeve, and at least one second inclined groove formed at an angle on the sleeve. One end of the lowest point of the second inclined groove is connected to one end of the highest point of the first inclined groove and has a height difference so that when the sleeve moves to the point where the ring block is located at the highest point of the first inclined groove, the ring block can fall into the second inclined groove, thereby allowing the sleeve to move along the trajectory of the second inclined groove. One end of the highest point of the second inclined groove is connected to one end of the lowest point of the first inclined groove and has a height difference so that when the sleeve moves to the point where the ring block is located at the highest point of the second inclined groove, the ring block can fall into the first inclined groove, thereby allowing the sleeve to move along the trajectory of the first inclined groove.

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