Modularized, high-temperature-resistant and high-strength multi-rotation-to-straight-stroke support

Abstract

The utility model discloses a modularized, high-temperature resistant, high-strength multi-turn to straight stroke support, which comprises a support upper part (12), a support lower part (17), a side plate (16) and a transmission component, the support upper part (12) and the support lower part (17) are welded and connected through the side plate (16), the multi-turn to straight stroke support is characterized in that the support upper part (12) is connected with an actuator, the support lower part (17) is connected with a valve, and the transmission component is connected with the actuator. The transmission assembly comprises a transmission shaft (2), a transmission lead screw (13), a first thrust ball bearing (7), a first thrust ring (8), a second thrust ring (10) and a belleville spring (5). The multi-turn straight stroke conversion support has the advantages of being resistant to high temperature, high in strength and modular in design, production cost is reduced, operation safety and stability of equipment are remarkably improved, and the multi-turn straight stroke conversion support is suitable for being applied to high-thrust adjusting valves under various high-temperature and high-pressure working conditions.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of multi-rotation straight stroke support, and particularly relates to a modular, high-temperature-resistant and high-strength multi-rotation straight stroke support. BACKGROUND

[0002] In the valve industry, electric actuators are an indispensable part, which mainly provide power through the rotary motion of the motor. In order to realize the precise adjustment function of the valve, the regulating valve usually adopts a straight stroke actuator. However, the existing straight stroke electric actuator often shows deficiencies when facing large thrust demand, therefore, the industry generally uses a multi-rotation electric actuator to cooperate with a thrust conversion device, which converts the rotary motion into linear motion through a thrust device or a support (including a silk sleeve and a lead screw).

[0003] The common low-cost solution at present is to directly use the thrust device matched by the actuator manufacturer. Although such thrust device is low in cost and high in efficiency, it is usually made of carbon steel or copper, etc., which leads to a sharp decline in physical properties of these materials under high temperature environment (especially when exceeding 450℃), and there is a serious safety hazard. In order to meet the demand of high temperature working condition, some manufacturers use chromium-molybdenum steel to make the thrust device, but the supply channel of such material is limited, and the price is expensive, which increases the cost of equipment.

[0004] In order to reduce the manufacturing cost, many valve manufacturers begin to design and produce the support made of chromium-molybdenum steel by themselves, and the silk sleeve and lead screw are built-in, which are usually made by casting. However, the specifications of the valve are various, including the differences of valve cover interface, actuator interface and valve stroke, etc., which leads to the fact that the support mold corresponding to each size of valve is needed, resulting in high cost of mold opening and being unable to meet the demand of various specifications.

[0005] In order to solve the above problems, modular support is gradually applied to the market. The purpose of modular support is to reduce the cost through generalization design, and the typical design is the threaded connection structure of upper and lower flanges and support column. However, due to the decline of material strength and plasticity in high temperature environment, the support column is easy to be deformed under stress, which leads to the shaking or twisting of the support, and even the instability and damage of the support in serious cases. In addition, the threaded connection has a gap, which further reduces the overall strength of the support.

[0006] Therefore, the main problems existing in the prior art include poor high temperature performance of the support, high cost, insufficient structural strength of the support, and difficulty in adapting to the demand of valves of different specifications. SUMMARY

[0007] In order to solve the above problems, the utility model provides a kind of modularization, high temperature resistance, high-strength multi-rotation change straight stroke support, by optimizing structure design, avoid threaded connection, using welding structure, and using the material suitable for high temperature working condition, to improve the strength and stability of support, while realizing the flexibility of cost reduction and modular design.

[0008] The utility model is realized through the following technical schemes: a kind of modularization, high temperature resistance, high-strength multi-rotation change straight stroke support, including support upper part, support lower part, side plate and transmission assembly, the support upper part is connected with support lower part by side plate welding, it is characterized in that:

[0009] The support upper part is connected with actuator, and the support lower part is connected with valve, and transmission assembly includes transmission shaft, transmission screw and first thrust ball bearing, first thrust ring, second thrust ring and butterfly spring;

[0010] The transmission shaft is transmitted by key with the rotary motion of actuator, and the lower end of transmission shaft is connected with transmission shaft sleeve transition fit, and transmission shaft sleeve is converted into linear motion by T-shaped thread with transmission screw;

[0011] The transmission screw is combined with indicator race and indicator, the indicator is clamped into the groove on side plate, and the rotary motion of transmission screw is limited;

[0012] The first thrust ball bearing and second thrust ball bearing are located between transmission shaft sleeve and support upper part, for supporting the axial load of transmission shaft, and the first thrust ring and second thrust ring are attached to the step of transmission shaft sleeve to increase the contact area, the butterfly spring is installed above the first thrust ball bearing, pre-tightens the first thrust ball bearing and second thrust ball bearing, avoids jumping, and all components in support upper part are locked by sleeve screw ring.

[0013] As a preferred technical solution, the side plate is welded and connected with the support upper part and the support lower part through the preset welding guide groove, to ensure the overall structural strength and stability.

[0014] As a preferred technical solution, the transmission screw is matched with the transmission shaft sleeve through T-shaped thread, to realize the conversion of rotary motion into linear motion.

[0015] As a preferred technical solution, the first thrust ball bearing and the second thrust ball bearing are composed of tight ring and loose ring, the tight ring is paired with the first thrust ring and the second thrust ring, to increase the stability of thrust transmission.

[0016] As a preferred technical solution, the butterfly spring is selected according to the maximum axial bearing load of the first thrust ball bearing and the second thrust ball bearing, and is installed by superposition or apposition, to ensure the reliability of thrust ball bearing under high temperature working condition.

[0017] As a preferred technical scheme, the upper part of the bracket, the side plate and the lower part of the bracket are formed with ring grooves through turning and milling, and the two ends of the side plate are provided with steps matched with the ring grooves and are fixed through welding.

[0018] As a preferred technical scheme, the upper part of the bracket, the side plate and the lower part of the bracket are made of chromium-molybdenum steel.

[0019] The bracket of the utility model adopts chromium-molybdenum steel material (such as 15CrMo or 12Cr1MoV), can keep good strength and plasticity under high temperature environment, is applicable to the working condition such as subcritical high temperature high pressure boiler with the maximum working temperature reaching 545 DEG C, avoids the risk that the performance of traditional carbon steel or copper thrust device sharply drops under high temperature, and ensures the safety and stability of equipment.

[0020] The bracket adopts welding connection instead of traditional screw connection, avoids the problems of strength reduction and deformation caused by screw gap under high temperature, ensures the precision and efficiency of welding operation through the design of preset welding guide groove, enhances the overall structural strength of the bracket, avoids the problems of valve jamming caused by bracket shaking, twisting and different shafts of upper and lower flanges, and thus improves the stability of equipment operation.

[0021] The utility model discloses a bracket is split into upper part, side plate and lower part three modules, and adopts the design of rotary body structure, reduces the blanking cost and processing difficulty of material, and the modular design makes the bracket can flexibly adjust the opening position of upper part and lower part or select different length of middle plate according to different valve size, avoids the high cost of repeated die opening, significantly reduces production cost, and improves the compatibility of the bracket to various specifications of valve.

[0022] The transmission screw rod and the transmission shaft sleeve in the bracket are matched through T-shaped threads, accurately convert rotary motion into linear motion, cooperate with the design of thrust ball bearing and thrust ring, can effectively bear axial load, reduce friction loss, ensure that the rotary motion of the actuator can be stably and efficiently converted into the straight stroke action of the valve, and improve the adjustment accuracy and execution efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can obtain other drawings according to these drawings without creating creative labor.

[0024] Figure 1 It is an explosion structure schematic view of the utility model.

[0025] Figure 2 It is the whole structure schematic view of the utility model;

[0026] Figure 3 It is the cross section schematic view of the utility model; DETAILED DESCRIPTION

[0027] All features disclosed in this specification, and / or all steps of any methods or processes disclosed in this specification, can be combined in any combination, except combinations where at least some of such features and / or steps are mutually exclusive.

[0028] Any feature disclosed in this specification, unless stated otherwise, can be replaced by any equivalent or other technically equivalent feature(s) for the purpose of the application. That is, unless stated otherwise, each feature is one example only of a number of equivalent or similar features.

[0029] As Figure 1 The utility model relates to a kind of modular, high-temperature-resistant, high-strength multi-rotation straight travel support, mainly for the power transmission between actuator and valve. The support structure is ingenious, solve the strength decline and reliability problem of multi-rotation electric actuator in high-temperature working condition in the prior art.

[0030] The support includes support upper portion 12, support lower portion 17, side plate 16 and transmission assembly, the support upper portion 12 is connected with support lower portion 17 by side plate 16 welding, to form integral frame structure. Specifically, support upper portion 12 is used to connect with actuator, and support lower portion 17 is connected with valve, and transmission assembly is responsible for the rotation movement of actuator is converted into the linear motion of valve, to realize the accurate adjustment of valve.

[0031] The core components of transmission assembly include transmission shaft 2, transmission screw rod 13, first thrust ball bearing 7, second thrust ball bearing 11, first thrust ring 8, second thrust ring 10 and butterfly spring 5. First, the transmission shaft 2 is transmitted by key 1 with the rotation movement of actuator, and the lower end of transmission shaft 2 is connected between transmission shaft sleeve 9 with transition fit mode. Transmission shaft sleeve 9 is then effectively converted into linear motion with the T-shaped thread cooperation of transmission screw rod 13, to realize the accurate control of multi-rotation electric actuator to straight travel valve.

[0032] To ensure the stability of the movement, the transmission screw rod 13 is combined with the indicator seat ring 14 and the indicator 15, the indicator 15 is embedded in the groove on the side plate 16, and the design limits the rotary movement of the transmission screw rod 13 and only allows linear movement. The first thrust ball bearing 7 and the second thrust ball bearing 11 are installed between the transmission shaft sleeve 9 and the bracket upper portion 12 for supporting the axial load of the transmission shaft. At the same time, the first thrust ring 8 and the second thrust ring 10 are attached to the step of the transmission shaft sleeve 9 to increase the contact area, thereby effectively dispersing the load and prolonging the service life of the assembly.

[0033] To ensure the reliability of the transmission assembly under high temperature working conditions, the utility model also sets the butterfly spring 5 above the thrust ball bearing 7, 11. The butterfly spring 5 can pre-tighten the thrust ball bearing 7, 11, avoid the jumping of the bearing in the high temperature environment, and firmly lock all the internal components in the bracket upper portion 12 through the sleeve screw ring 4, to ensure the stability of the bracket during use.

[0034] As a preferred technical solution, the side plate 16 is welded and connected with the bracket upper portion 12 and the bracket lower portion 17 through a pre-set welding guide groove, which ensures accurate operation during welding and enhances the strength and stability of the overall structure.

[0035] The T-shaped thread cooperation of the transmission screw rod 13 and the transmission shaft sleeve 9 realizes the accurate conversion of rotary movement to linear movement, which greatly improves the transmission efficiency and stability, and avoids the loosening or failure of the traditional threaded structure under high temperature working conditions.

[0036] The thrust ball bearing 7, 11 is partially designed by the combination of the tight ring and the loose ring, the tight ring is paired with the first thrust ring 8 and the second thrust ring 10, which further increases the stability of the thrust transmission and effectively avoids the displacement or instability phenomenon during the thrust transmission process.

[0037] In addition, the butterfly spring 5 is selected according to the maximum axial load of the first thrust ball bearing 7 and the second thrust ball bearing 11, and is installed by overlapping or folding, to ensure the reliability under high temperature working conditions. This design can ensure the stable operation of the bearing while further improving its durability under extreme working conditions.

[0038] In terms of processing, the bracket upper portion 12, the side plate 16 and the bracket lower portion 17 are all processed by turning and milling to form a ring groove, the two ends of the side plate 16 have a step matched with the ring groove, and are fixed by welding. This processing method not only ensures the matching accuracy of each part, but also improves the strength and reliability of the overall structure.

[0039] The whole bracket adopts chrome molybdenum steel material, the material has excellent high temperature resistance, can still keep enough strength and stability under the condition that working temperature reaches 545 DEG C, is applicable to high temperature and high pressure working condition of big thrust regulating valve uses.

[0040] Through the description of the above embodiment, the bracket has the characteristics of obvious modularization, high temperature resistance and high strength in the structural design, not only improves the reliability and service life of the equipment, but also effectively reduces the manufacturing and maintenance cost, and is suitable for the application requirements of various different specifications of valves in the valve industry.

[0041] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this, any change or replacement without creative labor should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be limited by the protection scope defined in the claims.

Claims

1. A modular, high-temperature-resistant, high-strength multi-rotation linear travel support, comprising a support upper part (12), a support lower part (17), a side plate (16) and a transmission assembly, the support upper part (12) and the support lower part (17) being weldedly connected through the side plate (16), characterized in that: the support upper part (12) is connected with an actuator, the support lower part (17) is connected with a valve, and the transmission assembly comprises a transmission shaft (2), a transmission screw (13), a first thrust ball bearing (7), a first thrust ring (8), a second thrust ring (10) and a butterfly spring (5); the transmission shaft (2) is connected with the rotary motion of the actuator through a key (1), the lower end of the transmission shaft (2) is transitionally connected with a transmission shaft sleeve (9), and the transmission shaft sleeve (9) converts the rotary motion into linear motion through T-shaped thread cooperation with the transmission screw (13); the transmission screw (13) is combined with an indicator race (14) and an indicator (15), the indicator (15) is clamped into a groove (160) on the side plate (16) to limit the rotary motion of the transmission screw (13); the first thrust ball bearing (7) and the second thrust ball bearing (11) are located between the transmission shaft sleeve (9) and the support upper part (12) to support the axial load of the transmission shaft, the first thrust ring (8) and the second thrust ring (10) are attached to the step of the transmission shaft sleeve (9) to increase the contact area, the butterfly spring (5) is installed above the first thrust ball bearing (7) to pre-tighten the first thrust ball bearing (7) and the second thrust ball bearing (11) and avoid jumping, and all components in the support upper part (12) are locked through a sleeve screw ring (4). The side plate (16) is weldedly connected with the support upper part (12) and the support lower part (17) through preset welding guide grooves to ensure the overall structural strength and stability. The first thrust ball bearing (7) and the second thrust ball bearing (11) are composed of a tight ring and a loose ring, the tight ring is paired with the first thrust ring (8) and the second thrust ring (10) to increase the stability of thrust transmission. The butterfly spring (5) is selected according to the maximum axial bearing load of the first thrust ball bearing (7) and the second thrust ball bearing (11) and is installed in a superimposed or apposed manner to ensure the reliability of the thrust ball bearing under high-temperature working conditions. The support upper part (12), the side plate (16) and the support lower part (17) are all formed with ring grooves through turning and milling processing, both ends of the side plate (16) have steps matched with the ring grooves and are fixed by welding.

2. The modular, high-temperature resistant, high-strength, multi-reversion linear travel mount of claim 1, wherein, The support upper part (12), the side plate (16) and the support lower part (17) are made of chromium-molybdenum steel.

3. The modular, high-temperature resistant, high-strength, multi-reversion linear travel mount of claim 1, wherein, ​ 4. The modular, high-temperature resistant, high-strength, multi-reversion linear travel mount of claim 1, wherein, ​ 5. The modular, high-temperature resistant, high-strength, multi-reversion linear stroke support of claim 1, wherein, ​ 6. The modular, high-temperature resistant, high-strength, multi-reversion linear travel mount of claim 1, wherein, ​

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