A worm gear box

Abstract

The application provides a worm gear box, belonging to the technical field of worm gear boxes.The worm gear box comprises a mounting shell, a mounting cover, a worm assembly, a worm gear and a driving wheel arranged inside the mounting shell.The worm assembly comprises a driving rod and a threaded sleeve movably connected to the outer wall of the driving rod.The threaded sleeve is provided with an adapter fixedly connected to the outer wall of the driving rod at both ends.The adapter is fixedly connected to a plurality of uniformly distributed limiters on the side close to the threaded sleeve.The threaded sleeve is provided with a limit slot corresponding to the limiters in the same number and position at both ends.The inside center of each limit slot is provided with an adjusting slot.Each limiter can move inside the corresponding limit slot.The position of the limiter inside the corresponding limit slot can be adjusted by rotating the driving rod, the limiting state of the threaded sleeve can be adjusted, hard contact can be avoided, and abrasion can be reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of worm gear boxes, and particularly relates to a worm gear box. BACKGROUND

[0002] With the continuous progress of valve technology, as the core transmission component of valve driving devices, worm gear boxes internally integrate worm gears and worm mechanisms, and bear the key role of transmitting torque, achieving deceleration and increasing output force. In view of the working characteristics of low valve opening and closing frequency and sudden load increase at the moment of closing, modern worm gear box design gradually adopts worm gear materials with high tooth root strength and more optimized worm types (such as toroidal worm), and cooperates with compact support structures to shorten the span, improve rigidity and transmission efficiency.

[0003] A self-adaptive lubrication worm gear box is disclosed in Chinese Patent No. CN202411623889.9, which belongs to the technical field of worm gear boxes. The self-adaptive lubrication worm gear box comprises a cover shell and a bottom shell, and further comprises: an oil inlet arranged at the top of the cover shell; an oil outlet arranged at the bottom of the bottom shell; a worm gear box composed of the cover shell and the bottom shell is internally provided with a worm gear and a worm, and the worm gear and the worm are connected in meshing; a first gear rotates synchronously with the worm, the first gear is arranged in the bottom shell, and a plurality of second gears are connected in meshing on the first gear; a standpipe is arranged in the bottom shell, a top end of the standpipe is communicated with a taper pipe, an impeller is arranged in the taper pipe, the impeller is fixedly connected with the second gear, and a nozzle is communicated with the taper pipe. The invention can release the stress accumulated at both ends of the worm, reduce the accumulation of internal stress, avoid fatigue fracture of the worm, and prolong the service life of the worm gear box.

[0004] However, in actual use, if the valve is closed too quickly, a strong water hammer pressure wave, i.e. water hammer effect, will be excited in the pipeline. The pressure wave reversely impacts the valve disc, trying to forcibly push the valve open, thereby posing an extreme test to the self-locking performance of the worm gear box. The huge impact force can damage the self-locking structure, causing the valve disc to slightly open or the transmission components to be severely damaged. In addition, in a system for conveying water to high terrain, if water supply is suddenly cut off, the reverse impact caused by backflow will also bring severe reverse load to the worm gear transmission, further increasing the risk of damage to the worm gear and the worm.

[0005] On the other hand, in actual operation, the valve is not always opened and closed, but is usually at an intermediate opening degree (such as 30% or 50%) for flow regulation. This working condition causes the meshing area of the worm gear and the worm to always concentrate in a limited section. At the same time, the force of the water flow passing through the valve acting on the valve disc is transmitted to the transmission system, so that the meshing area continuously bears a high stress, thereby causing serious wear of the local tooth surface and thread groove. In contrast, the other sections have less meshing opportunity and almost no wear. This stress concentration phenomenon causes extremely uneven wear distribution, significantly shortening the service life of the worm gear transmission components.

[0006] Therefore, in order to solve the above problems, it is necessary to provide a worm gear box. SUMMARY

[0007] The worm gear box aims to solve the problems that the water flow impact will cause damage risk to the worm gear transmission when the water hammer effect or backflow occurs during the use of the valve, and the force of the water flow through the valve acting on the valve disc will be transmitted to the transmission system, so that the meshing area continuously bears high stress, thereby causing serious wear of the local tooth surface and thread groove, and significantly shortening the service life of the worm gear transmission components.

[0008] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0009] A worm gear box, comprising a mounting shell, a mounting cover and a worm assembly, a worm gear and a drive wheel arranged inside the mounting shell:

[0010] The worm assembly comprises a drive rod and a threaded sleeve movably connected to the outer wall of the drive rod, both ends of the threaded sleeve are provided with adapter pieces fixedly connected to the outer wall of the drive rod, each adapter piece is fixedly connected to a plurality of evenly distributed limiting pieces on the side close to the threaded sleeve, both ends of the threaded sleeve are provided with limiting grooves corresponding in number and position to the limiting pieces, an adjusting groove is formed at the inner center of each limiting groove, each limiting piece can move inside the corresponding limiting groove, and the position of the limiting piece inside the corresponding limiting groove can be adjusted by rotating the drive rod, and the limiting state of the threaded sleeve can be adjusted.

[0011] Preferably, an installation groove is formed in the inner part of each limiting piece, an extrusion piece is slidably connected to each installation groove, a first elastic piece is connected between each extrusion piece and the corresponding installation groove, and when the extrusion piece is located inside the adjusting groove, the threaded sleeve can move towards the axis of the drive rod if the threaded sleeve is stressed and extruded.

[0012] Preferably, an adjusting piece is fixedly connected to the outer wall of the mounting shell, an accommodating cavity is formed in the inner part of the adjusting piece, one end of the drive rod is arranged inside the accommodating cavity and fixedly connected to a guide piece, a movable sleeve movably connected to the inner wall of the accommodating cavity is slidably connected to the outer wall of the guide piece, a guide groove is formed in the outer wall of the guide piece, and a connecting piece slidably connected to the guide groove is fixedly connected to the inner part of the movable sleeve.

[0013] Preferably, the inner side of the mounting cover is provided with a mounting ring, the outer side of the mounting cover is rotationally connected with a signboard, an assembly groove is formed in the mounting ring, a fixing member is fixedly connected in the assembly groove, the worm gear is rotationally connected with the inner wall of the mounting ring away from the mounting shell, the driving wheel is fixedly connected with the first rotating shaft on the side close to the mounting ring, the outer wall of the first rotating shaft is fixedly connected with a ratchet wheel, the first rotating shaft penetrates through the mounting ring and the mounting cover away from the ratchet wheel and is fixedly connected with the signboard, and the driving wheel can drive the ratchet wheel and the signboard to rotate synchronously when the driving wheel rotates.

[0014] Preferably, the inner side of the fixing member is fixedly connected with a limiting bin, the second rotating shaft and two third rotating shafts symmetrically arranged are rotationally connected in the limiting bin, the outer wall of the second rotating shaft is fixedly connected with a cam, the outer wall of each third rotating shaft is fixedly connected with a ratchet member matched with the ratchet wheel, and each ratchet member is connected with the inner wall of the limiting bin through a second elastic member.

[0015] Preferably, the inner part of the fixing member is provided with an isolation chamber, the inner part of the isolation chamber is fixedly connected with an isolation plate, the inner part of the isolation chamber can be divided into a first chamber and a second chamber through the isolation plate, the inner part of the first chamber is slidably connected with a moving plate, the end of the second rotating shaft away from the ratchet wheel is arranged in the second chamber and is fixedly connected with an adjusting gear, the inner part of the isolation plate is slidably connected with a sliding member, one end of the sliding member is fixedly connected with the moving plate, and the other end is fixedly connected with a rack engaged with the adjusting gear.

[0016] Preferably, the mounting cover is fixedly connected with a guide member, a flow guide groove is formed in the inner part of the guide member, the inner side of the guide member is provided with a sealing tube fixedly communicated with the flow guide groove, the inner side of the mounting cover is provided with a drainage tube, one end of the drainage tube is communicated with the inner part of the first chamber, the other end is communicated with the flow guide groove, an access groove corresponding to the position of the sealing tube is formed in the adjusting member, and the access groove is communicated with the containing cavity.

[0017] Preferably, the inner part of the containing cavity is filled with gas, the connecting member can move in the guide groove when the driving rod rotates, the movable sleeve can move in the containing cavity, when the movable sleeve moves in the containing cavity away from the guide member, the movable sleeve can extrude the gas in the containing cavity into the first chamber, and the moving plate can be pushed to move in the first chamber towards the isolation plate.

[0018] Preferably, when the movable sleeve moves in the accommodating cavity towards the direction close to the guide, the movable sleeve can extract the gas inside the first chamber into the accommodating cavity, and can move the moving plate in the first chamber towards the direction away from the isolation plate.

[0019] Preferably, when the moving plate moves in the first chamber, the moving plate can drive the rack to move synchronously through the sliding piece, can drive the adjusting gear to rotate, can adjust the extrusion degree of the cam to the two ratchet pieces, and can adjust the meshing state of the two ratchet pieces to the ratchet wheel.

[0020] Compared with the prior art, the present application has the following beneficial effects:

[0021] The present application is provided with a threaded sleeve. When the driving rod is rotated, the limiting piece is moved in the limiting groove first until the side of the limiting piece contacts the inner wall of the side of the limiting groove, thereby limiting the threaded sleeve. At this time, the threaded sleeve can be rotated synchronously by the driving rod. When the valve reaches the required state, the rotation of the driving rod in this direction is stopped, and the driving rod is rotated in the reverse direction until the extruding piece is stopped in the adjusting groove. At this time, if the teeth of the worm wheel excessively extrude the inner wall of the spiral groove of the threaded sleeve, the threaded sleeve will move on the driving rod to a certain extent according to the direction of the force, thereby avoiding hard contact and preventing the tooth surface from being excessively extruded by the inner wall of the spiral groove, which can cause wear or damage when the water flows through or is impacted by the water flow.

[0022] The present application is provided with a ratchet piece and a ratchet wheel. When the valve flow is adjusted, the driving rod is rotated to move the moving plate in the first chamber towards the direction close to or away from the isolation plate, to drive the adjusting gear to rotate clockwise or counterclockwise, to adjust the extrusion degree of the cam to the two ratchet pieces, and to adjust the meshing state of the two ratchet pieces to the ratchet wheel. If the pressure wave oscillation or the action force of the reverse fluid flow collides with the rotation direction of the driving wheel, the ratchet piece and the ratchet wheel can limit the reverse rotation of the driving wheel, can improve the load, can reduce the driving resistance, can preferentially avoid the increased wear between the driving wheel and the worm wheel, and can prevent the accuracy of adjustment from being affected. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate the present application together with the embodiments thereof, and explain the present application, but do not constitute a limitation of the present application. In the drawings:

[0024] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0025] Figure 2 It is a schematic diagram of the internal structure of the mounting shell of the present application;

[0026] Figure 3Structure diagram of the worm assembly of the present application;

[0027] Figure 4 Structure diagram of the threaded sleeve of the present application;

[0028] Figure 5 Structure diagram of the limiting piece of the present application;

[0029] Figure 6 Structure diagram of the adjusting piece of the present application;

[0030] Figure 7 Structure diagram of the adjusting piece of the present application;

[0031] Figure 8 Structure diagram of the guiding piece of the present application;

[0032] Figure 9 Structure diagram of the mounting cover of the present application;

[0033] Figure 10 Structure diagram of the driving wheel of the present application;

[0034] Figure 11 Structure diagram of the mounting ring of the present application;

[0035] Figure 12 Structure diagram of the isolation chamber of the present application.

[0036] In the figure: 1, mounting housing; 2, mounting cover; 21, signboard; 3, worm assembly; 31, driving rod; 32, threaded sleeve; 33, adapter; 34, limiting piece; 35, limiting groove; 36, adjusting groove; 37, mounting groove; 38, extrusion piece; 39, first elastic piece; 4, worm gear; 5, driving wheel; 51, first rotating shaft; 52, ratchet wheel; 6, adjusting piece; 61, accommodating cavity; 62, guiding piece; 63, movable sleeve; 64, guiding groove; 65, connecting piece; 66, through groove; 7, mounting ring; 71, assembly groove; 72, fixing piece; 73, limiting compartment; 74, second rotating shaft; 75, third rotating shaft; 76, cam; 77, ratchet piece; 78, second elastic piece; 79, isolation chamber; 710, isolation plate; 711, first cavity; 712, second cavity; 713, moving plate; 714, adjusting gear; 715, sliding piece; 716, rack; 8, guiding piece; 81, flow guiding groove; 82, sealing tube; 9, drainage tube. DETAILED DESCRIPTION

[0037] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0038] Embodiment one

[0039] In actual use, if the valve is closed too quickly, a strong water hammer pressure wave will be excited in the pipeline, i.e. water hammer effect. The pressure wave reversely impacts the valve disc, trying to forcibly push the valve open, thereby posing an extreme test to the self-locking performance of the worm gear box. The huge impact force can damage the self-locking structure, causing the valve disc to slightly open or the transmission components to be severely damaged. In addition, in a system for conveying water to high terrain, if the water supply is suddenly cut off, the reverse impact formed by backflow will also bring severe reverse load to the worm gear transmission, further increasing the risk of damage to the worm gear and the worm.

[0040] On the other hand, the valve is not usually fully opened and closed in actual operation, but is long-term at an intermediate opening degree (such as 30%, 50%) for flow regulation. This working condition causes the meshing area of the worm gear and the worm to always concentrate in a limited section. At the same time, the force of the water flowing through the valve acting on the valve disc is transmitted to the transmission system, so that the meshing area continuously bears high stress, thereby causing severe wear of the local tooth surface and thread groove. In contrast, the other sections have less meshing opportunity and almost no wear. This stress concentration phenomenon causes the wear distribution to be extremely uneven, significantly shortening the service life of the worm gear and worm transmission components.

[0041] The above-mentioned states are mainly caused by the hard contact between the worm gear and the worm, which causes the tooth surface of the worm gear to be excessively extruded against the inner wall of the spiral groove of the worm when the water flows through or is impacted by the water flow, resulting in wear or damage.

[0042] Please refer to Figures 1 to 5 The present application provides the following technical solutions: a worm gear box comprising a mounting shell 1, a mounting cover 2, and a worm assembly 3, a worm gear 4, and a driving wheel 5 arranged inside the mounting shell 1:

[0043] The worm assembly 3 comprises a driving rod 31 and a threaded sleeve 32 movably connected with the outer wall of the driving rod 31, both ends of the threaded sleeve 32 are provided with a connector 33 fixedly connected with the outer wall of the driving rod 31, each connector 33 is fixedly connected with a plurality of evenly distributed limiters 34 near one side of the threaded sleeve 32, both ends of the threaded sleeve 32 are provided with a plurality of limit grooves 35 corresponding in number and position to the corresponding limiters 34, the inside center of each limit groove 35 is provided with an adjusting groove 36, each limiter 34 can move in the corresponding limit groove 35, rotating the driving rod 31 can adjust the position of the limiter 34 in the corresponding limit groove 35, and the limiting state of the threaded sleeve 32 can be adjusted.

[0044] The inside of each limiter 34 is provided with a mounting groove 37, each mounting groove 37 is slidably connected with an extrusion piece 38, and the first elastic piece 39 is connected between each extrusion piece 38 and the corresponding mounting groove 37, and the driving rod 31 is rotated, when the extrusion piece 38 is located in the adjusting groove 36, if the threaded sleeve 32 is stressed and extruded, the threaded sleeve 32 can move towards the axis direction of the driving rod 31.

[0045] The threaded sleeve 32 is provided with a threaded groove matched with the worm wheel 4, the driving rod 31 is rotatably connected with the mounting shell 1 through the connector 33, and the prior art will not be repeated.

[0046] As shown in Figure 3 and Figure 4 , the connecting part of the adjusting groove 36 and the limit groove 35 is arc-shaped, and the side of the extrusion piece 38 and the limiter 34 close to the limit groove 35 is also arc-shaped, which is to facilitate the extrusion piece 38 and the limiter 34 to enter the inside of the limit groove 35 from the adjusting groove 36 when the limiter 34 moves from the inside of the limit groove 35.

[0047] During the rotation of the driving rod 31, the first elastic member 39 is always in a compressed state. When the pressing member 38 is located inside the limiting groove 35, the first elastic member 39 is in a first compressed state, at this time, the pressing member 38 completely enters the installation groove 37, the limiting member 34 can contact the inner wall of the limiting groove 35, and can limit and fix the threaded sleeve 32. When the pressing member 38 is located inside the adjusting groove 36, the first elastic member 39 rebounds to a certain extent and is in a second compressed state. At this time, part of the pressing member 38 enters the adjusting groove 36, and the limiting member 34 can move on the inner wall of the adjusting groove 36 and no longer limits and fixes the threaded sleeve 32. There is a gap between the existing thread groove and the tooth to fill the lubricating oil. If the teeth of the worm wheel 4 excessively press the inner wall of the spiral groove of the threaded sleeve 32 at this time, the threaded sleeve 32 will move to a certain extent on the driving rod 31 according to the stress direction, avoiding excessive pressing of the tooth on one side and the inner wall of the thread groove, avoiding hard contact. When the threaded sleeve 32 moves to the left on the driving rod 31, the left limiting member 34 can be inserted into the corresponding adjusting groove 36, so that the corresponding first elastic member 39 is compressed, and the right first elastic member 39 can further rebound, so that the corresponding pressing member 38 is always kept in the adjusting groove 36. Conversely, when the threaded sleeve 32 moves to the right on the driving rod 31, the right limiting member 34 can be inserted into the corresponding adjusting groove 36, so that the corresponding first elastic member 39 is compressed, and the left first elastic member 39 can further rebound, so that the corresponding pressing member 38 is always kept in the adjusting groove 36.

[0048] It should be noted that, due to the resistance between the worm wheel 4 and the threaded sleeve 32, each time the driving rod 31 is rotated, the limiting member 34 will be moved inside the limiting groove 35 first until the limiting member 34 contacts the inner wall of the limiting groove 35 on one side. At this time, the rotation of the driving rod 31 can drive the threaded sleeve 32 to rotate synchronously. When the valve reaches the required state, the rotation of the driving rod 31 in this direction is stopped, and the driving rod 31 is reversed until the pressing member 38 enters the adjusting groove 36 and stops when a jamming feeling is generated. At this time, if the teeth of the worm wheel 4 excessively press the inner wall of the spiral groove of the threaded sleeve 32, the threaded sleeve 32 will move to a certain extent on the driving rod 31 according to the stress direction, avoiding hard contact, preventing the tooth surface from being excessively pressed with the inner wall of the spiral groove when the water flows through or is impacted by the water flow, causing wear or damage.

[0049] In actual use, the driving rod 31 is rotated according to the requirement, if the driving rod 31 is rotated clockwise, the valve is adjusted to the required state, then the clockwise rotation of the driving rod 31 is stopped, and the driving rod 31 is rotated counterclockwise until the extrusion piece 38 stops in the adjusting groove 36, and vice versa, if the driving rod 31 is rotated counterclockwise, the valve is adjusted to the required state, then the counterclockwise rotation of the driving rod 31 is stopped, and the driving rod 31 is rotated clockwise until the extrusion piece 38 stops in the adjusting groove 36.

[0050] In summary, the threaded sleeve 32 is arranged, when the driving rod 31 is rotated, the limiting piece 34 is moved in the limiting groove 35 first until the side of the limiting piece 34 is in contact with the inner wall of the side of the limiting groove 35, the limiting of the threaded sleeve 32 is realized, at this time, the driving rod 31 can drive the threaded sleeve 32 to rotate synchronously, when the valve is adjusted to the required state, the rotation of the driving rod 31 in this direction is stopped, and the driving rod 31 is rotated reversely until the extrusion piece 38 stops in the adjusting groove 36, if the teeth of the worm wheel 4 excessively extrude the inner wall of the spiral groove of the threaded sleeve 32, the threaded sleeve 32 will move on the driving rod 31 according to the stress direction to a certain extent, the hard contact can be avoided, and the abrasion or damage of the tooth surface caused by the excessive extrusion of the spiral groove inner wall by the tooth surface when the water flows through or is impacted by the water flow can be prevented.

[0051] Example two

[0052] On the basis of the above-mentioned examples, when the valve is adjusted, the flow rate of the fluid is actually changed rapidly, and the fluid will impact the valve and the pipeline system violently due to inertia, so that the kinetic energy and pressure energy are converted rapidly, destructive pressure wave oscillation or violent impact of reverse flow of the fluid is formed, at this time, if the force is along the rotation direction, the force can provide assistance, if the force is opposite to the rotation direction, the force will increase the resistance, so that the load between the driving wheel and the worm wheel becomes larger, not only the driving of the worm wheel box is affected, but also the abrasion between the driving wheel and the worm wheel is increased, so that the gap is increased, and the accuracy of the adjustment is affected.

[0053] Please refer to Figures 6 to 12 The outer wall of the mounting shell 1 is fixedly connected with an adjusting piece 6, the adjusting piece 6 is provided with an accommodating cavity 61 in the inner portion, one end of the driving rod 31 is arranged in the accommodating cavity 61 and is fixedly connected with a guide piece 62, the outer wall of the guide piece 62 is slidably connected with a movable sleeve 63 movably connected with the inner wall of the accommodating cavity 61, the outer wall of the guide piece 62 is provided with a guide groove 64, and the inner portion of the movable sleeve 63 is fixedly connected with a connecting piece 65 slidably connected with the guide groove 64.

[0054] The end of the driving rod 31 away from the adjusting piece 6 is a driving end, used for connecting a driving device, rotating the driving rod 31 can drive the guide piece 62 to move synchronously, can make the connecting piece 65 move inside the guide groove 64, and can make the movable sleeve 63 move on the guide piece 62 to the left and right directions of the axis.

[0055] The driving wheel 5 is arranged inside the worm wheel 4, is connected with the valve through the driving wheel 5, and will not be repeated here.

[0056] The inner side of the mounting cover 2 is provided with a mounting ring 7, the outer side of the mounting cover 2 is rotatably connected with a sign 21, the mounting ring 7 is provided with an assembly groove 71, the assembly groove 71 is fixedly connected with a fixing piece 72, the worm wheel 4 is rotatably connected with the inner wall of the mounting ring 7 away from the mounting shell 1, the driving wheel 5 is fixedly connected with the first rotating shaft 51 close to the mounting ring 7, the outer wall of the first rotating shaft 51 is fixedly connected with a ratchet wheel 52, the first rotating shaft 51 away from the ratchet wheel 52 penetrates the mounting ring 7 and the mounting cover 2, and is fixedly connected with the sign 21, when the driving wheel 5 rotates, the ratchet wheel 52 and the sign 21 can be driven to rotate synchronously.

[0057] Rotating the sign 21 can feed back the current valve state through the scale mark on the mounting cover 2, and the prior art will not be repeated here.

[0058] The inner side of the fixing piece 72 is fixedly connected with a limiting bin 73, the limiting bin 73 is rotatably connected with a second rotating shaft 74 and two third rotating shafts 75 arranged symmetrically in the inside, the outer wall of the second rotating shaft 74 is fixedly connected with a cam 76, the outer wall of each third rotating shaft 75 is fixedly connected with a ratchet piece 77 matched with the ratchet wheel 52, and each ratchet piece 77 is connected with the inner wall of the limiting bin 73 through a second elastic piece 78.

[0059] The inner side of the fixing piece 72 is provided with an isolation chamber 79, the inner side of the isolation chamber 79 is fixedly connected with an isolation plate 710, the inner side of the isolation chamber 79 is divided into a first chamber 711 and a second chamber 712 through the isolation plate 710, the inner side of the first chamber 711 is slidably connected with a moving plate 713, the end of the second rotating shaft 74 away from the ratchet wheel 52 is arranged inside the second chamber 712 and is fixedly connected with an adjusting gear 714, the inner side of the isolation plate 710 is slidably connected with a sliding piece 715, one end of the sliding piece 715 is fixedly connected with the moving plate 713, and the other end is fixedly connected with a rack 716 engaged with the adjusting gear 714.

[0060] The installation cover 2 is fixedly connected with a guide connecting piece 8, the guide connecting piece 8 is internally provided with a guide groove 81, the inner side of the guide connecting piece 8 is provided with a sealing pipe 82 fixedly communicated with the guide groove 81, the inner side of the installation cover 2 is provided with a drainage pipe 9, one end of the drainage pipe 9 is communicated with the inside of the first chamber 711, the other end is communicated with the guide groove 81, the adjusting piece 6 is provided with a through groove 66 corresponding to the position of the sealing pipe 82, the through groove 66 is communicated with the containing cavity 61.

[0061] When the installation cover 2 is installed, the sealing pipe 82 can be inserted into the through groove 66, the gas in the containing cavity 61 can pass through the sealing pipe 82 and the drainage pipe 9 into the first chamber 711.

[0062] The inside of the containing cavity 61 is filled with gas, rotating the driving rod 31 can make the connecting piece 65 move in the guide groove 64, and can drive the movable sleeve 63 to move in the containing cavity 61, when the movable sleeve 63 moves in the containing cavity 61 towards the direction away from the guide piece 62, the movable sleeve 63 can extrude the gas in the containing cavity 61 into the first chamber 711, and can push the moving plate 713 to move in the first chamber 711 towards the direction close to the isolation plate 710.

[0063] When the movable sleeve 63 moves in the containing cavity 61 towards the direction close to the guide piece 62, the movable sleeve 63 can extract the gas in the first chamber 711 into the containing cavity 61, and can make the moving plate 713 move in the first chamber 711 towards the direction away from the isolation plate 710.

[0064] In the initial state, the movable sleeve 63 is in contact with the guide piece 62, at this time, the connecting piece 65 is at the limit position of one side of the guide groove 64, and the moving plate 713 is located at the side away from the isolation plate 710 in the first chamber 711, when the driving rod 31 is rotated forward, the connecting piece 65 can move to the limit position of the other side in the guide groove 64, can make the movable sleeve 63 move in the containing cavity 61 towards the direction away from the guide piece 62, can extrude the gas in the containing cavity 61 to pass through the sealing pipe 82 and the drainage pipe 9 into the first chamber 711, and can extrude the moving plate 713 to move towards the direction close to the isolation plate 710, when the driving rod 31 is reversely rotated, the connecting piece 65 can move to the initial position in the guide groove 64, can make the movable sleeve 63 move in the containing cavity 61 towards the direction close to the guide piece 62, can extract the gas in the first chamber 711 into the containing cavity 61, and can make the moving plate 713 move towards the direction away from the isolation plate 710, back to the initial position.

[0065] When the connecting piece 65 is at the limit positions of both sides of the guide groove 64, further rotating the driving rod 31 can make the movable sleeve 63 rotate in the containing cavity 61.

[0066] When the drive rod 31 rotates clockwise, it rotates counterclockwise, and vice versa. When the drive rod 31 rotates counterclockwise, it rotates clockwise.

[0067] When the movable plate 713 moves inside the first chamber 711, it can drive the rack 716 to move synchronously through the sliding member 715, drive the adjusting gear 714 to rotate, adjust the degree of compression of the cam 76 on the two ratchet members 77, and adjust the meshing state of the two ratchet members 77 on the ratchet wheel 52.

[0068] like Figure 11 As shown, for example, when the drive rod 31 rotates forward, it causes the drive wheel 5 to rotate clockwise, which in turn causes the connecting piece 65 to move to one extreme position inside the guide groove 64. During this process, the moving plate 713 moves inside the first chamber 711, which drives the rack 716 to drive the adjusting gear 714 to rotate counterclockwise via the sliding member 715. It also drives the cam 76 to rotate via the second rotating shaft 74, which causes the larger diameter area in the cam 76 to press against the right ratchet 77, which compresses the right second elastic member 78, and disengages the right ratchet 77 from the ratchet wheel 52. At the same time, during the rotation of the cam 76, the left surface of the cam 76 contacts the left ratchet 77, which causes the left second elastic member 78 to rebound, and the left ratchet 77 to engage with the ratchet wheel 52, thus limiting the counterclockwise rotation of the drive wheel 5. When the drive rod 31 rotates in the opposite direction, it causes the drive wheel 5 to rotate counterclockwise, which in turn causes the connecting piece 65 to move to the other extreme position inside the guide groove 64. During this process, the moving plate 713 moves inside the first chamber 711, which drives the rack 716 to rotate clockwise through the sliding piece 715, and drives the adjusting gear 714 to rotate through the second rotating shaft 74. This causes the larger diameter area in the cam 76 to squeeze the left ratchet 77, compressing the left second elastic piece 78 and disengaging the left ratchet 77 from the ratchet wheel 52. At the same time, during the rotation of the cam 76, the right surface of the cam 76 contacts the right ratchet 77, causing the right second elastic piece 78 to rebound and re-engage the right ratchet 77 with the ratchet wheel 52, thus limiting the clockwise rotation of the drive wheel 5.

[0069] Each time the rotation direction of the drive rod 31 is changed, the limiting member 34 will move from one side of the limiting groove 35 to the other side before driving the threaded sleeve 32 to rotate. During this process, the drive rod 31 can make the connector 65 move from one extreme position to the other extreme position inside the guide groove 64.

[0070] Need to explain, in the valve flow regulation, rotating drive rod 31 can make connecting piece 65 move inside guide groove 64, can adjust the position of movable sleeve 63 in containing cavity 61, can extrude the gas inside containing cavity 61 or extract the gas inside first chamber 711, can make moving plate 713 move inside first chamber 711 towards the direction of approaching or away from isolation plate 710, moving plate 713 moves inside first chamber 711 can drive rack 716 through sliding piece 715 to drive adjusting gear 714 to rotate clockwise or counterclockwise, can adjust the extrusion degree of cam 76 to two ratchet pieces 77, can adjust the meshing state of two ratchet pieces 77 to ratchet wheel 52, if drive wheel 5 rotates counterclockwise, then by adjusting the meshing state of ratchet piece 77 to ratchet wheel 52 to limit the clockwise rotation of drive wheel 5, if drive wheel 5 rotates clockwise, then by adjusting the meshing state of ratchet piece 77 to ratchet wheel 52 to limit the counterclockwise rotation of drive wheel 5, thus, when the valve flow is regulated, if the force of pressure wave oscillation or fluid reverse flow collides with the rotation direction of drive wheel 5, then by ratchet piece 77 to ratchet wheel 52 to limit the reverse rotation of drive wheel 5, can improve the load, reduce the driving resistance, can preferentially avoid the wear between drive wheel 5 and worm gear 4, prevent affecting the accuracy of regulation.

[0071] In summary, the present application is provided by ratchet piece 77 to ratchet wheel 52, when the valve flow is regulated, rotating drive rod 31 can make moving plate 713 move inside first chamber 711 towards the direction of approaching or away from isolation plate 710, can drive adjusting gear 714 to rotate clockwise or counterclockwise, can adjust the extrusion degree of cam 76 to two ratchet pieces 77, adjust the meshing state of two ratchet pieces 77 to ratchet wheel 52, if the force of pressure wave oscillation or fluid reverse flow collides with the rotation direction of drive wheel 5, then by ratchet piece 77 to ratchet wheel 52 to limit the reverse rotation of drive wheel 5, can improve the load, reduce the driving resistance, can preferentially avoid the wear between drive wheel 5 and worm gear 4, prevent affecting the accuracy of regulation.

[0072] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and not for limiting the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still can be modified to the technical scheme recorded in the foregoing embodiments, or equivalent replacement to part of the technical features. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application, should be included in the protection scope of the present application.

Claims

1. A worm wheel box, comprising a mounting shell (1), a mounting cover (2) and a worm assembly (3), a worm wheel (4) and a driving wheel (5) located inside the mounting shell (1), characterized in that: the worm assembly (3) comprises a driving rod (31) and a threaded sleeve (32) movably connected with the outer wall of the driving rod (31), both ends of the threaded sleeve (32) are provided with an adapter (33) fixedly connected with the outer wall of the driving rod (31), each adapter (33) is fixedly connected with a plurality of evenly distributed limiters (34) near one side of the threaded sleeve (32), both ends of the threaded sleeve (32) are provided with limit grooves (35) corresponding in number and position to the limiters (34), an adjusting groove (36) is formed at the inner center of each limit groove (35), each limiter (34) can move in the corresponding limit groove (35), rotating the driving rod (31) can adjust the position of the limiter (34) in the corresponding limit groove (35) to adjust the limiting state of the threaded sleeve (32); an installation groove (37) is formed in the inner part of each limiter (34), an extrusion piece (38) is slidably connected in each installation groove (37), a first elastic piece (39) is connected between each extrusion piece (38) and the corresponding installation groove (37), rotating the driving rod (31), when the extrusion piece (38) is located in the adjusting groove (36), if the threaded sleeve (32) is stressed and extruded, the threaded sleeve (32) can move towards the axis direction of the driving rod (31).

2. The worm gear box of claim 1, wherein: an adjusting piece (6) is fixedly connected to the outer wall of the mounting shell (1), an accommodating cavity (61) is formed in the inner part of the adjusting piece (6), one end of the driving rod (31) is located in the accommodating cavity (61) and fixedly connected with a guide piece (62), the outer wall of the guide piece (62) is slidably connected with a movable sleeve (63) movably connected with the inner wall of the accommodating cavity (61), the outer wall of the guide piece (62) is provided with a guide groove (64), the inner part of the movable sleeve (63) is fixedly connected with a connecting piece (65) slidably connected with the guide groove (64).

3. The worm gear box of claim 2, wherein: The mounting cover (2) has a mounting ring (7) on its inner side and an indicator (21) rotatably connected to the outer side of the mounting cover (2). The mounting ring (7) has an assembly groove (71) and a fastener (72) is fixedly connected inside the assembly groove (71). The end of the worm gear (4) away from the mounting housing (1) is rotatably connected to the inner wall of the mounting ring (7). The drive wheel (5) is fixedly connected to a first rotating shaft (51) on the side close to the mounting ring (7). A ratchet (52) is fixedly connected to the outer wall of the first rotating shaft (51). The end of the first rotating shaft (51) away from the ratchet (52) passes through the mounting ring (7) and the mounting cover (2) and is fixedly connected to the indicator (21). When the drive wheel (5) rotates, it can drive the ratchet (52) and the indicator (21) to rotate synchronously.

4. The worm gear box of claim 3, wherein: The inner side of the fixing member (72) is fixedly connected to the limiting chamber (73). The limiting chamber (73) is rotatably connected to a second rotating shaft (74) and two symmetrically arranged third rotating shafts (75). The outer wall of the second rotating shaft (74) is fixedly connected to a cam (76). The outer wall of each third rotating shaft (75) is fixedly connected to a ratchet (77) that is adapted to the ratchet (52). Each ratchet (77) is connected to the inner wall of the limiting chamber (73) by a second elastic member (78).

5. The worm gear box of claim 4, wherein: The fixing member (72) has an isolation chamber (79) inside. An isolation plate (710) is fixedly connected inside the isolation chamber (79). The isolation plate (710) can divide the interior of the isolation chamber (79) into a first chamber (711) and a second chamber (712). A moving plate (713) is slidably connected inside the first chamber (711). One end of the second rotating shaft (74) away from the ratchet (52) is located inside the second chamber (712) and is fixedly connected to an adjusting gear (714). A sliding member (715) is slidably connected inside the isolation plate (710). One end of the sliding member (715) is fixedly connected to the moving plate (713), and the other end is fixedly connected to a rack (716) that meshes with the adjusting gear (714).

6. The worm gear box of claim 5, wherein: A guide member (8) is fixedly connected to the mounting cover (2). A guide groove (81) is provided inside the guide member (8). A sealing tube (82) is fixedly connected to the guide groove (81) on the inner side of the guide member (8). A drainage tube (9) is provided on the inner side of the mounting cover (2). One end of the drainage tube (9) is connected to the inside of the first chamber (711), and the other end is connected to the guide groove (81). A through groove (66) corresponding to the position of the sealing tube (82) is provided on the adjusting member (6), and the through groove (66) is connected to the receiving cavity (61).

7. The worm gear box of claim 6, wherein: The cavity (61) is filled with gas. Rotating the drive rod (31) can move the connector (65) inside the guide groove (64) and drive the movable sleeve (63) to move inside the cavity (61). When the movable sleeve (63) moves away from the guide (62) inside the cavity (61), the movable sleeve (63) can squeeze the gas inside the cavity (61) into the first chamber (711) and push the moving plate (713) to move closer to the isolation plate (710) inside the first chamber (711).

8. The worm gear box of claim 7, wherein: When the movable sleeve (63) moves towards the guide (62) inside the receiving cavity (61), the movable sleeve (63) can draw gas from the first chamber (711) into the receiving cavity (61), and can make the movable plate (713) move away from the isolation plate (710) inside the first chamber (711).

9. The worm gear box of claim 8, wherein: When the movable plate (713) moves inside the first chamber (711), it can drive the rack (716) to move synchronously through the sliding member (715), drive the adjusting gear (714) to rotate, adjust the degree of compression of the cam (76) on the two ratchet members (77), and adjust the meshing state of the two ratchet members (77) on the ratchet wheel (52).

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