Worm gear case

Abstract

The invention provides a worm gear case, and belongs to the technical field of worm gear cases, the worm gear case comprises a mounting shell, a mounting cover, a worm assembly, a worm gear and a driving wheel, the worm assembly, the worm gear and the driving wheel are arranged in the mounting shell, and the worm assembly comprises a driving rod and a threaded sleeve movably connected with the outer wall of the driving rod; the two ends of the threaded sleeve are provided with adapting pieces fixedly connected with the outer wall of the driving rod, the side, close to the threaded sleeve, of each adapting piece is fixedly connected with a plurality of evenly-distributed limiting pieces, and the two ends of the threaded sleeve are provided with limiting grooves which are the same as the corresponding limiting pieces in number and correspond to the corresponding limiting pieces in position. And an adjusting groove is formed in the center of the interior of each limiting groove, each limiting piece can move in the corresponding limiting groove, the position of the limiting piece in the corresponding limiting groove 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 of 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 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 and worm 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: 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: 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 uniformly distributed limiting pieces near the side of 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.

[0009] 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.

[0010] Preferably, the outer wall of the mounting shell is fixedly connected to an adjusting piece, 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, the outer wall of the guide piece is slidably connected to a movable sleeve movably connected to the inner wall of the accommodating cavity, a guide groove is formed in the outer wall of the guide piece, and a connecting piece is fixedly connected to the inner part of the movable sleeve and slidably connected to the guide groove.

[0011] 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.

[0012] 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.

[0013] Preferably, an isolation chamber is formed in the fixing member, an isolation plate is fixedly connected in the isolation chamber, the isolation chamber is divided into a first chamber and a second chamber through the isolation plate, a moving plate is slidably connected in the first chamber, the second rotating shaft is arranged in the second chamber away from the ratchet wheel and is fixedly connected with an adjusting gear, a sliding member is slidably connected in the isolation plate, 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.

[0014] Preferably, a guide member is fixedly connected on the mounting cover, a flow guide groove is formed in the guide member, a sealing tube is fixedly connected with the flow guide groove on the inner side of the guide member, a drainage tube is arranged on the inner side of the mounting cover, one end of the drainage tube is connected with the first chamber, the other end is connected 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 connected with the containing cavity.

[0015] Preferably, the containing cavity is filled with gas, the connecting member can move in the guide groove by rotating the driving rod, 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 move in the first chamber towards the isolation plate.

[0016] 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.

[0017] 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.

[0018] Compared with the prior art, the present application has the following beneficial effects: The present application is provided with a threaded sleeve. When the driving rod is rotated, the limiting piece moves 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 enters the adjusting groove and stops. 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.

[0019] 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 wear between the driving wheel and the worm wheel, and can prevent the accuracy of adjustment from being affected. BRIEF DESCRIPTION OF DRAWINGS

[0020] 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: Figure 1 It is a schematic diagram of the overall structure of the present application; Figure 2 It is a schematic diagram of the internal structure of the mounting shell of the present application; Figure 3 It is a schematic diagram of the structure of the worm assembly of the present application; Figure 4 It is a schematic diagram of the structure of the threaded sleeve of the present application; Figure 5 The internal structure diagram of the limiting piece of the present application is shown in the figure. Figure 6 The structure diagram of the adjusting piece of the present application is shown in the figure. Figure 7 The internal structure diagram of the adjusting piece of the present application is shown in the figure. Figure 8 The structure diagram of the guiding piece of the present application is shown in the figure. Figure 9 The structure diagram of the mounting cover of the present application is shown in the figure. Figure 10 The structure diagram of the driving wheel of the present application is shown in the figure. Figure 11 The structure diagram of the mounting ring of the present application is shown in the figure. Figure 12 The internal structure diagram of the isolation chamber of the present application is shown in the figure.

[0021] In the figure: 1, mounting shell; 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 wheel; 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 bin; 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, guide connecting piece; 81, flow guiding groove; 82, sealing tube; 9, drainage tube. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0023] Embodiment one 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 push the valve open forcibly, thereby posing an extreme challenge 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 be 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 of backflow can also bring severe reverse load to the worm gear transmission, further increasing the risk of damage to the worm gear and the worm.

[0024] On the other hand, in actual operation, the valve is usually not fully opened and closed, but is kept at an intermediate opening (e.g. 30%, 50%) for a long time to regulate the flow. 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, causing the meshing area to continuously bear 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.

[0025] The above-mentioned states are mainly due to the hard contact between the worm gear and the worm, causing the tooth surface of the worm gear to be excessively extruded against the inner wall of the helical groove of the worm when the water flows through or is impacted by the water flow, resulting in wear or damage.

[0026] 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: The worm assembly 3 comprises a driving rod 31 and a threaded sleeve 32 movably connected to the outer wall of the driving rod 31, both ends of the threaded sleeve 32 are provided with adapter pieces 33 fixedly connected to the outer wall of the driving rod 31, each adapter piece 33 is fixedly connected to a plurality of uniformly distributed limiting pieces 34 on the side close to the threaded sleeve 32, both ends of the threaded sleeve 32 are provided with limiting grooves 35 corresponding in number and position to the limiting pieces 34, and each limiting groove 35 is provided with an adjusting groove 36 at the inner center thereof, each limiting piece 34 can move inside the corresponding limiting groove 35, and rotating the driving rod 31 can adjust the position of the limiting piece 34 inside the corresponding limiting groove 35 and adjust the limiting state of the threaded sleeve 32.

[0027] Each limiting piece 34 is provided with an installation groove 37 inside, each installation groove 37 is slidably connected to an extrusion piece 38, and each extrusion piece 38 is connected to the corresponding installation groove 37 through a first elastic piece 39, and rotating the driving rod 31 can make the extrusion piece 38 located inside the adjusting groove 36.

[0028] Threaded sleeve 32 is provided with a threaded groove matched with worm gear 4, drive rod 31 is rotatably connected with mounting shell 1 through adapter 33, which is known in the art and will not be described here.

[0029] As shown in Figure 3 and Figure 4 , the connection between adjusting groove 36 and limiting groove 35 is arc-shaped, and the side of extrusion piece 38 and limiting piece 34 close to limiting groove 35 is also arc-shaped, which is to facilitate the movement of extrusion piece 38 and limiting piece 34 from adjusting groove 36 into the inside of limiting groove 35 when limiting piece 34 moves from the inside of limiting groove 35.

[0030] During the rotation of drive rod 31, first elastic piece 39 is always in a compressed state. When extrusion piece 38 is located inside limiting groove 35, first elastic piece 39 is in a first compressed state, at this time extrusion piece 38 completely enters the inside of mounting groove 37, limiting piece 34 can contact with the inner wall of limiting groove 35, and can limit and fix threaded sleeve 32. When extrusion piece 38 is located inside adjusting groove 36, first elastic piece 39 rebounds to a certain extent and is in a second compressed state, at this time part of extrusion piece 38 enters the inside of adjusting groove 36, at this time limiting piece 34 can move in the inner wall of adjusting groove 36 and no longer limits and fixes threaded sleeve 32. There is a certain gap between the existing threaded groove and the teeth for filling lubricating oil. If the teeth of worm gear 4 excessively extrude the inner wall of the spiral groove of threaded sleeve 32 at this time, threaded sleeve 32 will move to a certain extent on drive rod 31 to the left or to the right according to the direction of force, avoiding the excessive extrusion of the teeth on one side of the inner wall of the threaded groove and avoiding hard contact. When threaded sleeve 32 moves to the left on drive rod 31, the left limiting piece 34 can be inserted into the corresponding adjusting groove 36, which can compress the corresponding first elastic piece 39, and the right first elastic piece 39 can further rebound, which can keep the corresponding extrusion piece 38 in adjusting groove 36, and vice versa. When threaded sleeve 32 moves to the right on drive rod 31, the right limiting piece 34 can be inserted into the corresponding adjusting groove 36, which can compress the corresponding first elastic piece 39, and the left first elastic piece 39 can further rebound, which can keep the corresponding extrusion piece 38 in adjusting groove 36.

[0031] It needs to be explained that, because of the resistance between the worm wheel 4 and the threaded sleeve 32, each time the driving rod 31 is rotated, the limiting piece 34 will be moved inside the limiting groove 35 first until the side of the limiting piece 34 contacts the inner wall of one side of the limiting groove 35, at which 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 rotated in the opposite direction until the extrusion piece 38 enters the adjusting groove 36, at which time the rotation is stopped, 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 to the left or to the right according to the direction of the force to a certain extent, avoiding hard contact, preventing the tooth surface from being excessively extruded with the inner wall of the spiral groove when the water flows through or is impacted by the water flow, causing wear or damage.

[0032] In actual use, the driving rod 31 is rotated according to the needs, if the driving rod 31 is rotated clockwise, when the valve reaches the required state, the clockwise rotation of the driving rod 31 needs to be stopped, and the driving rod 31 is rotated counterclockwise until the extrusion piece 38 enters the adjusting groove 36 and stops, and vice versa, if the driving rod 31 is rotated counterclockwise, when the valve reaches the required state, the counterclockwise rotation of the driving rod 31 needs to be stopped, and the driving rod 31 is rotated clockwise until the extrusion piece 38 enters the adjusting groove 36 and stops.

[0033] In summary, through the setting of the threaded sleeve 32, when the driving rod 31 is rotated, the limiting piece 34 will be moved inside the limiting groove 35 first until the side of the limiting piece 34 contacts the inner wall of one side of the limiting groove 35, achieving the limiting of the threaded sleeve 32, at which 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 rotated in the opposite direction until the extrusion piece 38 enters the adjusting groove 36 and stops, 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 to a certain extent according to the direction of the force, avoiding hard contact, preventing the tooth surface from being excessively extruded with the inner wall of the spiral groove when the water flows through or is impacted by the water flow, causing wear or damage.

[0034] Example two On the basis of the above embodiment, when the valve adjusts the flow, it is essentially to quickly change the fluid flow rate, and the fluid will impact the valve and the pipeline system due to inertia, resulting in a sharp conversion of kinetic energy and pressure energy, forming a destructive pressure wave oscillation or a violent impact of fluid reverse flow. At this time, if the force is along the rotation direction, it can provide assistance, and if the force is against the rotation direction, it will increase the resistance, resulting in a larger load between the driving wheel and the worm gear, which not only affects the driving of the worm gear box, but also exacerbates the wear between the driving wheel and the worm gear, resulting in a larger gap and affecting the accuracy of the adjustment.

[0035] Please refer to Figures 6 to 12 The outer wall of the mounting shell 1 is fixedly connected with an adjusting member 6, the inside of the adjusting member 6 is provided with an accommodating cavity 61, one end of the driving rod 31 is located inside the accommodating cavity 61 and is fixedly connected with a guide member 62, the outer wall of the guide member 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 member 62 is provided with a guide groove 64, and the inside of the movable sleeve 63 is fixedly connected with a connecting member 65 slidably connected with the guide groove 64.

[0036] The end of the driving rod 31 away from the adjusting member 6 is a driving end for connecting a driving device, rotating the driving rod 31 can drive the guide member 62 to move synchronously, the connecting member 65 can move in the guide groove 64, and the movable sleeve 63 can move left and right on the guide member 62.

[0037] The driving wheel 5 is located inside the worm gear 4 and is connected with the valve through the driving wheel 5, which is not described again.

[0038] The inside of the mounting cover 2 is provided with a mounting ring 7, the outside of the mounting cover 2 is rotatably connected with an indicator 21, the mounting ring 7 is provided with an assembly groove 71, the inside of the assembly groove 71 is fixedly connected with a fixing member 72, the end of the worm gear 4 away from the mounting shell 1 is rotatably connected with the inner wall of the mounting ring 7, the side of the driving wheel 5 close to the mounting ring 7 is fixedly connected with a first rotating shaft 51, 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 indicator 21, and when the driving wheel 5 rotates, the ratchet wheel 52 and the indicator 21 can be driven to rotate synchronously.

[0039] Rotating the indicator 21 can feed back the current valve state through the scale mark on the mounting cover 2, which is not described again.

[0040] The inner side of the fixing piece 72 is fixedly connected with a limiting bin 73, the inner side of the limiting bin 73 is rotatably connected with a second rotating shaft 74 and two third rotating shafts 75 arranged in symmetry, 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.

[0041] 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 cavity 711 and a second cavity 712 through the isolation plate 710, the inner side of the first cavity 711 is slidably connected with a moving plate 713, one end of the second rotating shaft 74 away from the ratchet wheel 52 is arranged in the second cavity 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.

[0042] The mounting cover 2 is fixedly connected with a guide piece 8, the inner side of the guide piece 8 is provided with a flow guide groove 81, the inner side of the guide piece 8 is provided with a sealing pipe 82 fixedly communicated with the flow guide groove 81, the inner side of the mounting cover 2 is provided with a drainage pipe 9, one end of the drainage pipe 9 is communicated with the inner side of the first cavity 711, and the other end is communicated with the flow guide groove 81, the adjusting piece 6 is provided with a through groove 66 corresponding to the position of the sealing pipe 82, and the through groove 66 is communicated with the containing cavity 61.

[0043] When the mounting cover 2 is mounted, the sealing pipe 82 can be inserted into the inner side of the through groove 66, and the gas in the containing cavity 61 can pass through the sealing pipe 82 and the drainage pipe 9 and enter the inner side of the first cavity 711.

[0044] The inner side of the containing cavity 61 is filled with gas, rotating the driving rod 31 can drive the connecting piece 65 to move in the guide groove 64 and drive the movable sleeve 63 to move in the containing cavity 61, when the movable sleeve 63 moves in the containing cavity 61 and moves away from the guide piece 62, the movable sleeve 63 can extrude the gas in the containing cavity 61 into the first cavity 711 and push the moving plate 713 to move in the first cavity 711 and move towards the isolation plate 710.

[0045] When the movable sleeve 63 moves in the containing cavity 61 and moves towards the guide piece 62, the movable sleeve 63 can extract the gas in the first cavity 711 into the containing cavity 61, and the moving plate 713 can move in the first cavity 711 and move away from the isolation plate 710.

[0046] In the initial state, the movable sleeve 63 is in contact with the guide 62, and the connecting member 65 is at the limit position on one side of the guide groove 64, and the moving plate 713 is at the limit position on the side away from the isolation plate 710 in the first chamber 711. When the driving rod 31 rotates forward, the connecting member 65 can move to the limit position on the other side of the guide groove 64, and the movable sleeve 63 can move in the accommodating cavity 61 to the side away from the guide 62, so as to extrude the gas in the accommodating cavity 61 to enter the first chamber 711 through the sealing pipe 82 and the drainage pipe 9, and the moving plate 713 can move to the side close to the isolation plate 710. When the driving rod 31 rotates reversely, the connecting member 65 can move to the initial position in the guide groove 64, and the movable sleeve 63 can move in the accommodating cavity 61 to the side close to the guide 62, so as to extract the gas in the first chamber 711 into the accommodating cavity 61, and the moving plate 713 can move to the side away from the isolation plate 710.

[0047] When the connecting member 65 is at the limit position on both sides of the guide groove 64, rotating the driving rod 31 can rotate the movable sleeve 63 in the accommodating cavity 61.

[0048] When the driving rod 31 rotates forward in the clockwise direction, the driving rod 31 rotates reversely in the counterclockwise direction, and vice versa.

[0049] When the moving plate 713 moves in the first chamber 711, the rack 716 can be driven to move synchronously by the sliding member 715, the adjusting gear 714 can be driven to rotate, the extrusion degree of the cam 76 on the two ratchet members 77 can be adjusted, and the meshing state of the two ratchet members 77 on the ratchet wheel 52 can be adjusted.

[0050] As shown in FIG. 1, the device comprises a driving rod 31, a connecting member 65, a guide groove 64, a movable sleeve 63, a guide 62, an accommodating cavity 61, a sealing pipe 82, a drainage pipe 9, a first chamber 711, a moving plate 713, a sliding member 715, a rack 716, an adjusting gear 714, a cam 76, and two ratchet members 77. Figure 11As shown, for example, when the driving rod 31 rotates forward to drive the driving wheel 5 to rotate clockwise, the connecting piece 65 can move inside the guide slot 64 to one side limit position, in the process, the moving plate 713 moves inside the first chamber 711 to drive the rack 716 through the sliding piece 715 to drive the adjusting gear 714 to rotate counterclockwise, to drive the cam 76 to rotate through the second rotating shaft 74, to extrude the larger diameter area in the cam 76 to compress the right second elastic piece 78, to make the right side ratchet piece 77 disengage from the engagement with the ratchet wheel 52, at the same time, in the process of rotating the cam 76, the left surface of the cam 76 can contact the left side ratchet piece 77, the left second elastic piece 78 can rebound, the left side ratchet piece 77 can engage with the ratchet wheel 52, to limit the counterclockwise rotation of the driving wheel 5, when the driving rod 31 reverses to drive the driving wheel 5 to rotate counterclockwise, the connecting piece 65 can move inside the guide slot 64 to the other side limit position, in the process, the moving plate 713 moves inside the first chamber 711 to drive the rack 716 through the sliding piece 715 to drive the adjusting gear 714 to rotate clockwise, to drive the cam 76 to rotate through the second rotating shaft 74, to extrude the larger diameter area in the cam 76 to compress the left second elastic piece 78, to make the left side ratchet piece 77 disengage from the engagement with the ratchet wheel 52, at the same time, in the process of rotating the cam 76, the right surface of the cam 76 can contact the right side ratchet piece 77, the right second elastic piece 78 can rebound, the right side ratchet piece 77 can engage with the ratchet wheel 52, to limit the clockwise rotation of the driving wheel 5.

[0051] Each time the driving rod 31 changes the direction of rotation, the limiting piece 34 will preferentially move from one side of the limiting slot 35 to the other side to drive the threaded sleeve 32 to rotate, in the process, the driving rod 31 can make the connecting piece 65 move inside the guide slot 64 from one side limit position to the other side limit position.

[0052] 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.

[0053] 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.

[0054] 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 solutions recorded in the foregoing embodiments, or equivalent replacement of 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 gear box, comprising a mounting housing (1), a mounting cover (2), and a worm assembly (3), a worm wheel (4), and a drive wheel (5) disposed inside the mounting housing (1), characterized in that: The worm gear assembly (3) includes a drive rod (31) and a threaded sleeve (32) movably connected to the outer wall of the drive rod (31). Both ends of the threaded sleeve (32) are provided with adapters (33) fixedly connected to the outer wall of the drive rod (31). Each adapter (33) is fixedly connected to a plurality of evenly distributed limiting members (34) on the side near the threaded sleeve (32). Both ends of the threaded sleeve (32) are provided with limiting grooves (35) that are the same number and position as the corresponding limiting members (34). Each limiting groove (35) is provided with an adjustment groove (36) at the center of its interior. Each limiting member (34) can move inside the corresponding limiting groove (35). Rotating the drive rod (31) can adjust the position of the limiting member (34) inside the corresponding limiting groove (35) and adjust the limiting state of the threaded sleeve (32).

2. The worm gear box according to claim 1, characterized in that: Each of the limiting members (34) has an installation groove (37) inside, and each of the installation grooves (37) is slidably connected to an extruder (38). Each extruder (38) is connected to a first elastic member (39) between itself and the corresponding installation groove (37). When the drive rod (31) is rotated, if the threaded sleeve (32) is subjected to stress extrusion when the extruder (38) is inside the adjustment groove (36), the threaded sleeve (32) can move in the direction of the axis of the drive rod (31).

3. The worm gear box according to claim 2, characterized in that: An adjusting member (6) is fixedly connected to the outer wall of the mounting housing (1). The adjusting member (6) has a receiving cavity (61) inside. One end of the driving rod (31) is located inside the receiving cavity (61) and is fixedly connected to a guide member (62). The outer wall of the guide member (62) is slidably connected to a movable sleeve (63) that is movably connected to the inner wall of the receiving cavity (61). The outer wall of the guide member (62) has a guide groove (64). The inside of the movable sleeve (63) is fixedly connected to a connector (65) that is slidably connected to the guide groove (64).

4. The worm gear box according to claim 3, characterized in that: 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 fixing member (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 the 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 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.

5. The worm gear box according to claim 4, characterized in that: 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).

6. The worm gear box according to claim 5, characterized in that: An isolation chamber (79) is provided inside the fixing member (72). 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). The 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).

7. The worm gear box according to claim 6, characterized in that: 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).

8. The worm gear box according to claim 7, characterized in that: 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).

9. The worm gear box according to claim 8, characterized in that: 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).

10. The worm gear box according to claim 9, characterized in that: 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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