Novel worm wheel head

Abstract

The utility model relates to a novel worm gear head, which belongs to the technical field of valves and comprises a box body, a box cover, a worm gear and a worm, the interior of the box body is divided into a worm gear cavity and a worm cavity, the box cover is arranged above the cavity of the box body, and the worm gear is located between a central hole of the worm gear cavity of the box body and a corresponding central hole of the box cover. The upper end and the lower end are sealed with the joint of the box body and the box cover through sealing rings; the worm is fixed on the worm shaft through a set screw; shaft holes are formed in the two ends of a worm cavity of the box body, needle roller thrust bearings for supporting a worm shaft are arranged at the shaft holes, worm gear and worm transmission is adopted, it is guaranteed that the transmission ratio is remarkably increased, high efficiency of transmission efficiency is also considered, and in the transmission process, through the thrust effect of the needle roller thrust bearings arranged at the two ends of a worm, the transmission efficiency is improved. The rotating stability of the worm is greatly guaranteed, unnecessary vibration is reduced, meanwhile, the rotating range of the worm gear can be adjusted through the set screw, and operation is more stable and reliable.

Description

Technical Field

[0001] The present disclosure belongs to the field of valve technology, and particularly relates to a novel worm gear head. Background Art

[0002] The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.

[0003] As a key control element, valves are used in various fluid delivery systems. The main function is to regulate and control the flow of fluid to ensure the normal operation of the system. However, in existing fluid control systems, the valve worm gear head is a common valve drive device, which is mainly composed of components such as a worm wheel, a worm, a handwheel or a gearbox. The structural design of the worm gear head enables it to convert manual or electric rotational motion into linear motion, thereby realizing the opening and closing of the valve. However, common turbine heads are usually large in size, which not only increases the size of the overall equipment, but also leads to a decrease in transmission efficiency. Moreover, the vibration in the transmission process of the worm gear can easily cause unstable meshing between the worm wheel and the worm, which not only affects the transmission efficiency, but may also cause premature wear of the worm wheel and the worm. Utility Model Content

[0004] The purpose of the present disclosure is to provide a novel worm gear head that can solve at least one of the above technical problems.

[0005] To achieve the above-mentioned purpose, one or more embodiments of the present disclosure provide a new type of worm gear head, including a housing, a housing cover, a worm gear and a worm. The interior of the housing is a cavity structure, which is divided into a worm gear cavity and a worm gear cavity. The housing cover is arranged above the housing cavity structure. The worm gear is arranged in the worm gear cavity of the housing and is located at the center of the worm gear cavity. The upper and lower ends of the worm gear are connected to the housing and the housing cover, and the connection is sealed with a sealing ring; shaft holes are provided at both ends of the housing worm gear cavity, and thrust needle roller bearings supporting the worm gear shaft are provided in the shaft holes.

[0006] Furthermore, a set screw is provided on the housing of the worm gear cavity portion; the worm gear has a sector gear shape, and the rotation range of the worm gear is adjusted by the set screw.

[0007] Furthermore, a skeleton oil seal is provided between the worm and the thrust needle roller bearing.

[0008] Furthermore, the two ends of the worm limit the position of the worm on the worm shaft through limit screws.

[0009] Furthermore, an end cover oil seal is provided at one end of the outer side of the worm cavity shaft hole, and a bracket is provided at the other end.

[0010] Furthermore, a handwheel is provided on one side of the bracket through which the worm shaft passes, and a locking disk is provided between the handwheel and the bracket.

[0011] Furthermore, the cross section of the bracket is an "L"-shaped plate, and a limiting plate is vertically arranged downward at the end of the short side of the bracket.

[0012] Furthermore, the handwheel is fixed on the worm shaft through a first elastic cylindrical pin.

[0013] Furthermore, the locking disk is fixed on the worm shaft via a second elastic cylindrical pin.

[0014] Furthermore, an indicator plate is provided on the outer side of the box cover, and the indicator plate is fixed to the box cover by countersunk screws.

[0015] The beneficial effects of one or more of the above technical solutions are:

[0016] The worm gear head disclosed herein adopts a worm gear transmission, which not only ensures a significant improvement in the transmission ratio, but also takes into account the high efficiency of the transmission. During the transmission process, the thrust of the thrust needle bearings provided at both ends of the worm greatly ensures the smooth rotation of the worm, reducing unnecessary vibration. At the same time, the worm gear can adjust the rotation range by means of a set screw, making the operation more stable and reliable. The connection hole on the limit plate is aligned with the through hole on the locking disk by a pin, so that when the worm gear head is rotated to the open or closed state, the handwheel is prevented from automatically rotating due to the failure of the self-locking property of the worm gear, causing the valve to open and close abnormally. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings in the specification, which constitute a part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation on this application.

[0018] Figure 1 A perspective view of a worm gear head in one or more embodiments of the present disclosure;

[0019] Figure 2 A front plan view of a worm gear head in one or more embodiments of the present disclosure;

[0020] Figure 3 A schematic diagram of the internal chamber structure of the worm gear head in one or more embodiments of the present disclosure;

[0021] Figure 4 A side plan view of a worm gear head in one or more embodiments of the present disclosure;

[0022] Figure 5 In one or more embodiments of the present disclosure Figure 4 AA cross-sectional view.

[0023] In the figure, 1. worm gear; 2. sealing ring; 3. worm; 4. set screw; 5. end cover oil seal; 6. thrust needle roller bearing; 7. housing; 8. housing cover; 9. hexagonal head bolt; 10. indicator plate; 11. sealing gasket; 12. countersunk screw; 13. handwheel; 14. hexagonal nut; 15. locking disk; 16. combined seal; 17. skeleton oil seal; 18. worm shaft; 19. first elastic cylindrical pin; 20. second elastic cylindrical pin; 21. bracket; 22. limit screw. DETAILED DESCRIPTION

[0024] like Figure 1-Figure 5 As shown, this embodiment provides a new type of worm gear head, including a box body 7, a box cover 8, a worm wheel 1 and a worm 3; the interior of the box body 7 is a cavity structure, which is divided into a worm wheel cavity and a worm cavity, and the box cover 8 is arranged above the cavity structure of the box body 7. The box body 7 and the box cover 8 are fixed by bolt connection, and the bolts can be selected from common hexagonal head bolts 9.

[0025] like Figure 3 As shown, the worm wheel 1 is arranged in the worm wheel cavity of the housing 7, located at the center of the worm wheel cavity. The upper and lower ends of the worm wheel 1 are connected to the housing 7 and the housing cover 8, and the connection is sealed with a sealing ring 2; the sealing ring 2 uses an existing O-ring. The two ends of the worm 3 are limited by limit screws 22 to limit the position of the worm 3 on the worm shaft 18, preventing the worm 3 from sliding on the worm shaft 18, causing meshing mismatch between the worm wheel 1 and the worm 3. The housing 7 is provided with an axial hole at both ends of the worm 3 in the axial direction of the worm cavity, and a thrust needle roller bearing 6 is provided in the axial hole to support the worm shaft 18; the needle diameter deviation of the thrust needle roller bearing 6 is extremely small, so that these bearings can withstand heavy axial loads and impact loads. At the same time, the thrust needle roller bearing 6 provides very high rigidity in a very small axial space. In addition, the portion of the thrust needle roller bearing 6 facing the outside of the axial hole is provided with a skeleton oil seal 17 to prevent grease leakage from the bearing.

[0026] like Figure 1 and Figure 3 As shown, a set screw 4 is provided on the outer casing 7 of the worm gear cavity; the installation direction of the set screw 4 is perpendicular to the spatial direction of the axial direction of the worm 3. The worm gear 1 has a fan-shaped gear shape. The fan-shaped structure can reduce the overall weight of the worm gear head and facilitate the adjustment of the valve switch; the set screw 4 is connected to the outer side of the casing 7 and is provided with a hexagonal nut 14 and a combined seal 16. By adjusting the position of the hexagonal nut 14 on the set screw 4 and then adjusting the length of the set screw 4 entering the casing 7, the rotation range of the worm gear 1 can be adjusted and limited. The combined seal 16 provided on the set screw 4 can prevent gas leakage inside the worm gear head.

[0027] like Figure 1As shown, an end cover oil seal 5 is provided at one end of the outer side of the worm cavity shaft hole of the worm 3, and a bracket 21 is provided at the other end. A handwheel 13 is provided on the side where the worm shaft passes through the bracket 21, and a locking disk 15 is provided between the handwheel 13 and the bracket 21. The locking disk 15 is fixed to the worm shaft 18 through a second elastic cylindrical pin 20; the handwheel 13 is fixed to the worm shaft 18 through a first elastic cylindrical pin 19.

[0028] like Figure 2 and Figure 3 As shown, the cross-section of the bracket 21 is a "Z"-shaped plate. One end of the "Z"-shaped bracket 21 is a square pressure plate used to tighten the skeleton oil seal in the shaft hole of the box body 7, and the other end is a limit plate with a circular connecting hole, which is connected to the locking plate 15 to play a limiting role.

[0029] Specifically, there are multiple through holes evenly distributed on the circumference of the locking disk 15 that are the same size as the connecting holes of the limit plate. The connecting holes on the limit plate are aligned with the through holes on the locking disk 15 by using pins. This can prevent the handwheel 13 from automatically rotating due to the failure of the self-locking characteristics of the worm gear when the worm head is rotated to the open or closed state, causing the valve to switch abnormally.

[0030] An indicator plate 10 is provided on the outside of the top of the box cover 8, and the indicator plate 10 is fixed to the box cover 8 by countersunk screws 12. A sealing gasket 11 is provided between the connecting surface of the indicator plate and the box cover 8 to prevent fluid from leaking from the position of the indicator plate 10.

[0031] The working principle of this utility model is as follows:

[0032] When the worm shaft 18 rotates, the worm 3 also rotates. According to the principle of worm gear engagement, the worm 3 drives the worm wheel 1 during the rotation process, causing the worm wheel 1 to rotate around the center of the housing 7. The rotation of the worm wheel 1 can realize the opening and closing operation of the valve. By adjusting the position of the hexagonal nut 14 on the set screw 4, the length of the set screw 4 entering the housing 7 can be adjusted, and the rotation range of the worm wheel 1 can be adjusted and limited.

[0033] Although the above describes the specific implementation methods of the present disclosure in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present disclosure. Those skilled in the art should understand that on the basis of the technical solution of the present disclosure, various modifications or variations that can be made by those skilled in the art without creative work are still within the scope of protection of the present disclosure.

Claims

1. A new type of worm gear head, characterized in that: It includes a box body, a box cover, a worm wheel and a worm. The interior of the box body is a cavity structure, which is divided into a worm wheel cavity and a worm cavity. The box cover is arranged above the box body cavity structure. The worm wheel is arranged in the worm wheel cavity of the box body and is located at the center of the worm wheel cavity. The upper and lower ends of the worm wheel are connected to the box body and the box cover, and the connection is sealed with a sealing ring; shaft holes are provided at both ends of the box body worm cavity, and thrust needle roller bearings supporting the worm shaft are provided in the shaft holes.

2. A novel worm gear head according to claim 1, characterized in that: A set screw is provided on the housing of the worm gear cavity; the worm gear is in the shape of a sector gear, and the rotation range of the worm gear is adjusted by the set screw.

3. A novel worm gear head according to claim 1, characterized in that: A skeleton oil seal is provided between the worm and the thrust needle roller bearing.

4. A novel worm gear head according to claim 1, characterized in that: The two ends of the worm are provided with limit screws to limit the position of the worm on the worm shaft.

5. A novel worm gear head according to claim 1, characterized in that: An end cover oil seal is provided at one end of the outer side of the worm cavity shaft hole, and a bracket is provided at the other end.

6. A novel worm gear head according to claim 1, characterized in that: A hand wheel is provided on one side of the worm shaft passing through the bracket, and a locking disk is provided between the hand wheel and the bracket.

7. A novel worm gear head according to claim 5, characterized in that: The cross section of the bracket is an "L"-shaped plate, and a limiting plate is vertically arranged downward at the end of the short side of the bracket.

8. A novel worm gear head according to claim 6, characterized in that: The hand wheel is fixed on the worm shaft through a first elastic cylindrical pin.

9. A novel worm gear head according to claim 6, characterized in that: The locking disk is fixed on the worm shaft via a second elastic cylindrical pin.

10. A novel worm gear head according to claim 1, characterized in that: An indicator plate is provided on the outer side of the box cover and is fixed on the box cover by countersunk screws.

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